Onconetix, Inc. 10-Q

Item 1. Financial Statements ONCONETIX, INC. Condensed Consolidated Balance Sheets (Unaudited) September 30, December 31, 2025 2024 ASSETS Current assets Cash $ 836,556 $ 646,500 Accounts receivable, net 2,552 25,717 Inventories 151,556 64,079 Prepaid expenses and other current assets 311,362 213,971 Total current assets 1,302,026 950,267 Property and equipment, net 40,388 62,896 Deferred offering costs 150,000 — Operating right of use asset 6,155 119,427 Goodwill 18,180,299 27,048,973 Total assets $ 19,678,868 $ 28,181,563 LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ 1,804,163 $ 3,787,564 Accrued expenses 476,289 888,988 Notes payable, net of debt discount of $ 0 and $ 4,966 at September 30, 2025 and December 31, 2024, respectively 160,267 9,328,061 Operating lease liability, current 6,155 119,427 Subscription agreement liability – Related Party — 4,123,000 Contingent warrant liabilities 53,149 43,089 Warrant liabilities 12,815,000 — Derivative liabilities 988,000 — Total current liabilities 16,303,023 18,290,129 Pension benefit obligation - 280,879 Total liabilities 16,303,023 18,571,008 Commitments and Contingencies Series C Redeemable Preferred Stock, $ 0.00001 par value, 10,000 shares authorized, 7 and 3,499 shares issued and outstanding at September 30, 2025 and December 31, 2024, respectively 1,724 1,067,928 Stockholders’ equity Common stock, $ 0.00001 par value, 250,000,000 shares authorized at September 30, 2025 and December 31, 2024; 1,560,820 and 138,422 the shares issued at September 30, 2025 and December 31, 2024, respectively; 1,560,668 and 138,270 shares outstanding at September 30, 2025 and December 31, 2024, respectively 15 1 Series D Preferred Stock, $ 0.00001 par value, 32,000 and 0 shares authorized at September 30, 2025 and December 31, 2024, respectively; 16,325 and 0 shares issued and outstanding at September 30, 2025 and December 31, 2024, respectively. — — Additional paid-in capital 141,431,240 127,825,743 Treasury stock, at cost; 152 shares of common stock at September 30, 2025 and December 31, 2024 ( 625,791 ) ( 625,791 ) Due from shareholders — ( 250,308 ) Accumulated deficit ( 136,884,245 ) ( 115,683,621 ) Accumulated other comprehensive loss ( 547,098 ) ( 2,723,397 ) Total stockholders’ equity 3,374,121 8,542,627 Total liabilities, convertible preferred stock, and stockholders’ equity $ 19,678,868 $ 28,181,563 The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. 1 ONCONETIX, INC. Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) Three Months Ended Three Months Ended Nine Months Ended Nine Months Ended September 30, 2025 September 30, 2024 September 30, 2025 September 30, 2024 Revenue $ 303,651 $ 406,859 $ 511,775 $ 1,812,140 Cost of revenue 34,757 301,445 126,546 1,417,010 Gross profit 268,894 105,414 385,229 395,130 Operating expenses Selling, general and administrative 2,341,347 2,641,916 5,539,144 8,599,642 Research and development ( 3,211 ) 109,365 ( 90,426 ) 154,649 Impairment of ENTADFI assets — — — 3,530,716 Impairment of goodwill — — 11,512,000 15,453,000 Total operating expenses 2,338,136 2,751,281 16,960,718 27,738,007 Loss from operations ( 2,069,242 ) ( 2,645,867 ) ( 16,575,489 ) ( 27,342,877 ) Other (expense) income Loss on extinguishment of note payable ( 5,384,719 ) — ( 5,384,719 ) — Loss on issuance of preferred stock and warrants ( 2,543,329 ) — ( 2,543,329 ) — Loss on extinguishment of preferred stock ( 196,244 ) — ( 196,244 ) — Interest expense - related party — ( 153,302 ) — ( 534,245 ) Interest expense ( 300,069 ) ( 231,656 ) ( 746,758 ) ( 625,084 ) Change in fair value of subscription agreement liability — ( 928,400 ) 3,127,962 ( 950,000 ) Change in fair value of contingent warrant liabilities ( 36 ) 30,448 ( 10,060 ) 30,448 Change in fair value of warrant liabilities 1,934,000 — 1,934,000 — Change in fair value of derivative liabilities ( 216,000 ) — ( 216,000 ) — Gain on forgiveness of accounts payable — — 944,694 — Other income (loss) ( 8,063 ) 44,988 ( 36,086 ) 41,894 Total other expense ( 6,714,460 ) ( 1,237,922 ) ( 3,126,540 ) ( 2,036,987 ) Loss before income taxes ( 8,783,702 ) ( 3,883,789 ) ( 19,702,029 ) ( 29,379,864 ) Income tax benefit — 56,384 — 127,183 Net loss $ ( 8,783,702 ) $ ( 3,827,405 ) $ ( 19,702,029 ) $ ( 29,252,681 ) Deemed dividend Series C preferred stock — — ( 1,498,595 ) — Net loss applicable to common stockholders ( 8,783,702 ) ( 3,827,405 ) ( 21,200,624 ) ( 29,252,681 ) Net loss per share, basic and diluted $ ( 6.25 ) $ ( 249.08 ) $ ( 29.14 ) $ ( 3,082.12 ) Weighted average number of common shares outstanding, basic and diluted 1,405,469 15,366 727,431 9,491 Other comprehensive income (loss) Net loss $ ( 8,783,702 ) $ ( 3,827,405 ) $ ( 19,702,029 ) $ ( 29,252,681 ) Foreign currency translation ( 502,651 ) 3,488,514 1,520,861 ( 1,392,630 ) Change in pension benefit obligation 340,899 ( 97,005 ) 655,438 24,267 Total comprehensive loss $ ( 8,945,454 ) $ ( 435,896 ) $ ( 17,525,730 ) $ ( 30,621,044 ) The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. 2 ONCONETIX, INC. Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) (Unaudited) Series A Preferred Stock Common Stock Additional Paid-in Treasury Stock Accumulated Accumulated Other Comprehensive Due from Total Onconetix Equity Non- controlling Total Stockholders’ Equity Shares Amount Shares Amount Capital Shares Amount Deficit Income Shareholders (Deficit) Interest (Deficit) Balance at December 31, 2023 3,000 $ — 6,703 $ — $ 49,429,037 ( 152 ) $ ( 625,791 ) $ ( 56,786,194 ) $ 2,380,920 — $ ( 5,602,028 ) $ 7,006,504 $ 1,404,476 Stock-based compensation — — — — 23,865 — — — — — 23,865 28,785 52,650 Foreign currency translation adjustment — — — — — — — — ( 4,991,144 ) — ( 4,991,144 ) — ( 4,991,144 ) Change in pension benefit obligation — — — — — — — — 154,678 — 154,678 — 154,678 Net loss — — — — — — — ( 11,118,572 ) — — ( 11,118,572 ) — ( 11,118,572 ) Balance at March 31, 2024 3,000 $ — 6,703 $ — $ 49,452,902 ( 152 ) $ ( 625,791 ) $ ( 67,904,766 ) $ ( 2,455,546 ) — $ ( 21,533,201 ) $ 7,035,289 $ ( 14,497,912 ) Restricted stock forfeitures — — ( 3 ) — — — — — — — — — — Exercise of stock options — — 4 — 163 — — — — — 163 — 163 Stock-based compensation — — — — ( 47,478 ) — — — — — ( 47,478 ) 46,703 ( 775 ) Foreign currency translation adjustment — — — — — — — — 110,000 — 110,000 — 110,000 Change in pension benefit obligation — — — — — — — — ( 33,406 ) — ( 33,406 ) — ( 33,406 ) Net loss — — — — — — — ( 14,306,704 ) — — ( 14,306,704 ) — ( 14,306,704 ) Balance at June 30, 2024 3,000 $ — 6,704 $ — $ 49,405,587 ( 152 ) $ ( 625,791 ) $ ( 82,211,470 ) $ ( 2,378,952 ) — $ ( 35,810,626 ) $ 7,081,992 $ ( 28,728,634 ) Issuance of common stock and warrants from exercise of preferred investment options — — 2,193 — 765,029 — — — — — 765,029 — 765,029 Grant and immediate exercise of warrants — — 1,812 — 6,155 — — — — — 6,155 — 6,155 Issuance of shares in connection with subscription liability — — 6,040 — 5,134,247 — — — — — 5,134,247 — 5,134,247 Conversion of Series A shares to common stock upon reverse split ( 3,000 ) — 1,679 — — — — — — — — — — Conversion of Series B shares to common stock upon reverse split — — 79,315 1 64,236,084 — — — — — 64,236,085 — 64,236,085 Stock-based compensation expense — — — — 16,849 — — — — — 16,849 28,785 45,634 Issuance of restricted common stock — — 195 — — — — — — — — — — Foreign currency translation adjustment — — — — — — — — 3,488,514 — 3,488,514 — 3,488,514 Change in pension benefit obligation — — — — — — — — ( 97,005 ) — ( 97,005 ) — ( 97,005 ) Net loss — — — — — — — ( 3,827,405 ) — — ( 3,827,405 ) — ( 3,827,405 ) Balance at September 30, 2024 — $ — 97,938 $ 1 $ 119,563,951 ( 152 ) $ ( 625,791 ) $ ( 86,038,875 ) $ 1,012,557 — $ 33,911,843 $ 7,110,777 $ 41,022,620 3 ONCONETIX, INC. Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) (Unaudited) Series D Preferred Stock Common Stock Additional Paid-in Treasury Stock Accumulated Accumulated Other Comprehensive Due from Total Onconetix Non- controlling Total Stockholders’ Equity Shares Amount Shares Amount Capital Shares Amount Deficit Income Shareholders Equity Interest (Deficit) Balance at December 31, 2024 — $ — 138,422 $ 1 $ 127,825,743 ( 152 ) $ ( 625,791 ) $ ( 115,683,621 ) $ ( 2,723,397 ) ( 250,308 ) $ 8,542,627 $ — $ 8,542,627 Issuance of common stock in connection with the ELOC — — 294,194 3 4,776,306 — — — — 250,308 5,026,617 — 5,026,617 Stock-based compensation expense — — — — 29,256 — — — — — 29,256 — 29,256 Redemption of Series C Preferred Stock — — — — — — — ( 1,170,091 ) — — ( 1,170,091 ) — ( 1,170,091 ) Foreign currency translation adjustment — — — — — — — — 141,048 — 141,048 — 141,048 Change in pension benefit obligation — — — — — — — — ( 30,779 ) — ( 30,779 ) — ( 30,779 ) Net loss — — — — — — — ( 8,545,885 ) — — ( 8,545,885 ) — ( 8,545,885 ) Balance at March 31, 2025 — $ — 432,616 $ 4 $ 132,631,305 ( 152 ) $ ( 625,791 ) $ ( 125,399,597 ) $ ( 2,613,128 ) — $ 3,992,793 $ — $ 3,992,793 Issuance of common stock in connection with the ELOC — — 335,123 4 1,365,034 — — — — — 1,365,038 — 1,365,038 Stock-based compensation expense — — — — 30,982 — — — — — 30,982 — 30,982 Cash in lieu of shares — — ( 127 ) — ( 926 ) — — — — — ( 926 ) — ( 926 ) Redemption of Series C Preferred Stock — — — — — — — ( 328,504 ) — — ( 328,504 ) — ( 328,504 ) Settlement of subscription agreement liability — — 241,514 2 995,036 — — — — — 995,038 — 995,038 Foreign currency translation adjustment — — — — — — — — 1,882,464 — 1,882,464 — 1,882,464 Change in pension benefit obligation — — — — — — — — 345,318 — 345,318 — 345,318 Net loss — — — — — — — ( 2,372,442 ) — — ( 2,372,442 ) — ( 2,372,442 ) Balance at June 30, 2025 — $ — 1,009,126 $ 10 $ 135,021,431 ( 152 ) $ ( 625,791 ) $ ( 128,100,543 ) $ ( 385,346 ) — $ 5,909,761 $ — $ 5,909,761 Stock-based compensation expense — — — — 9,795 — — — — — 9,795 — 9,795 Issuance of restricted common stock — — 2,472 — — — — — — — — — — Issuance of Series D Preferred Stock 16,099 — — — 5,352,541 — — — — — 5,352,541 — 5,352,541 Conversion of Series C Preferred shares to common stock — — 544,409 5 801,246 — — — — — 801,251 — 801,251 Exchange of Series C Preferred Stock to Series D Preferred Stock 244 — — — 246,227 — — — — — 246,227 — 246,227 Conversion of Series D Preferred Stock to common stock ( 18 ) — 4,878 — — — — — — — — — — Cancellation of restricted common stock — — ( 65 ) — — — — — — — — — — Foreign currency translation adjustment — — — — — — — — ( 502,651 ) — ( 502,651 ) — ( 502,651 ) Change in pension benefit obligation — — — — — — — — 340,899 — 340,899 — 340,899 Net loss — — — — — — — ( 8,783,702 ) — — ( 8,783,702 ) — ( 8,783,702 ) Balance at September 30, 2025 16,325 $ — 1,560,820 $ 15 $ 141,431,240 ( 152 ) $ ( 625,791 ) $ ( 136,884,245 ) $ ( 547,098 ) — $ 3,374,121 $ — $ 3,374,121 The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. 4 ONCONETIX, INC. Consolidated Statements of Cash Flows (Unaudited) Nine months Ended September 30, 2025 Nine months Ended September 30, 2024 Cash flows from operating activities Net loss $ ( 19,702,029 ) $ ( 29,252,681 ) Adjustments to reconcile net loss to net cash used in operating activities: Loss on impairment of goodwill 11,512,000 15,453,000 Impairment of ENTADFI assets — 3,530,716 Amortization of debt discounts 120,162 371,578 Amortization of debt discount - related party — 400,000 Depreciation and amortization 11,834 612,046 Net periodic pension benefit 353,384 16,502 Stock-based compensation 70,033 98,228 Interest accrued on note payable — 230,532 Interest accrued on note payable – related party — 134,247 Loss on impairment of inventory of ENTADFI — 356,637 Loss on extinguishment of notes payable 5,384,719 — Loss on extinguishment of Series C preferred stock 196,244 — Loss on issuance of Series D preferred stock 2,543,329 — Change in fair value of contingent warrant liabilities 10,060 ( 35,730 ) Change in fair value of warrant liabilities ( 1,934,000 ) — Change in fair value of derivative liabilities 216,000 — Change in fair value of subscription agreement liability – related party ( 3,127,962 ) 950,000 Gain on forgiveness of accounts payable ( 944,694 ) — Deferred tax benefit — ( 127,183 ) Loss on disposal of property and equipment 17,033 — Changes in operating assets and liabilities: Accounts receivable 25,244 49,079 Inventories ( 74,182 ) ( 113,102 ) Prepaid expenses and other current assets 370,868 70,563 Prepaid expenses, long-term — ( 7,749 ) Deferred offering costs ( 150,000 ) — Accounts payable ( 1,047,968 ) ( 1,242,071 ) Accrued expenses ( 437,882 ) ( 1,072,781 ) Net cash used in operating activities ( 6,587,805 ) ( 9,578,169 ) Cash flows from investing activities Purchases of property and equipment — ( 24,597 ) Net cash Provided by (used in) investing activities — ( 24,597 ) Cash flows from financing activities Proceeds from issuance of note payable – related party — 5,000,000 Proceeds from issuance of note payable 875,000 853,550 Payment of financing costs — ( 400,000 ) Principal payments of notes payable ( 6,947,360 ) ( 942,307 ) Proceeds from exercise of preferred investment options, net — 922,749 Payment for redemption of Series C Preferred Stock ( 1,713,570 ) — Proceeds from exercise of stock options — 163 Proceeds from exercise of warrants — 6,155 Proceeds from issuance of Series D preferred stock and warrants 9,301,200 — Proceeds from sale of common stock 6,391,634 — Cash in lieu of shares ( 926 ) — Net cash provided by financing activities 7,905,978 5,440,310 Effect of exchange rate changes on cash ( 1,128,117 ) ( 50,384 ) Net increase (decrease) in cash 190,056 ( 4,212,840 ) Cash, beginning of period 646,500 4,554,335 Cash, end of period $ 836,556 $ 341,495 Supplemental disclosure of cash flow information: Cash paid for interest $ 188,313 $ 19,658 Noncash investing and financing activities: Incremental fair value of exchanged preferred investment options $ — $ 1,874,777 Recognition of contingent warrant liabilities $ — $ 157,720 Conversion of Series A Preferred Stock to common stock $ — $ 1 Conversion of Series B Preferred Stock to common stock $ — $ 64,236,085 Settlement of related party note payable and accrued interest through issuance of common stock $ — $ 5,134,247 Operating right-of-use asset obtained in exchange of lease liability $ — $ 87,864 D&O insurance premium financed $ 460,875 $ — Deemed dividend owed to Series C preferred stock shareholders $ 409,510 $ — Settlement of subscription agreement liability $ 995,038 $ — Conversion of Series C preferred stock to common stock $ 801,241 $ — Recognition of warrant liabilities $ 14,749,000 $ — Recognition of derivative liabilities $ 772,000 $ — Recognition of Series D preferred stock $ 5,630,946 $ — Series C preferred stock exchanged for Series D preferred stock $ 246,227 $ — Settlement of note payable through issuance of Series D preferred stock $ 3,430,244 $ — The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. 5 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 1 — Organization and Basis of Presentation Organization and Nature of Operations Onconetix, Inc. (formerly known as Blue Water Biotech, Inc. and Blue Water Vaccines Inc.) (the “Company” or “Onconetix”) was formed on October 26, 2018, and is a commercial stage biotechnology company focused on the research, development, and commercialization of innovative solutions for men’s health and oncology. On December 15, 2023, Onconetix acquired 100 % of the issued and outstanding voting equity interests in Proteomedix AG, a Swiss company (“Proteomedix” or “PMX”), and its related diagnostic product Proclarix. As a result of this transaction, Proteomedix became a wholly owned subsidiary of Onconetix. Proteomedix is a healthcare company whose mission is to transform prostate cancer diagnosis. Proteomedix has identified novel biomarker signatures with utility in prostate cancer diagnosis, prognosis and therapy management. In April 2023, the Company acquired ENTADFI, a Food and Drug Administration (“FDA”)-approved, once daily pill that combines finasteride and tadalafil for the treatment of benign prostatic hyperplasia. Historically, the Company’s focus was on the research and development of transformational vaccines to prevent infectious diseases worldwide, until the third quarter of 2023, at which time the Company halted its efforts on vaccine development activities to focus on commercialization activities for ENTADFI and pursue other potential acquisitions. However, in light of (i) the time and resources needed to continue pursuing commercialization of ENTADFI, and (ii) the Company’s cash runway and indebtedness, the Company has abandoned commercialization of ENTADFI and is in the process of destroying its inventory of the product. Based on the circumstances surrounding ENTADFI, the ENTADFI assets were fully impaired at June 30, 2024 (see Note 4). On April 21, 2023, the Company filed an amendment to its Amended and Restated Certificate of Incorporation with the Secretary of State of Delaware to change its corporate name from “Blue Water Vaccines Inc.” to “Blue Water Biotech, Inc.” The name change was effective as of April 21, 2023. On December 15, 2023, the Company filed an amendment to its Amended and Restated Certificate of Incorporation with the Secretary of State of Delaware to change its corporate name from “Blue Water Biotech, Inc.” to “Onconetix, Inc.” In connection with each of the name changes, the Company also amended the Company’s bylaws to reflect the new corporate name. Reverse Stock Split On September 24, 2024, the Company effected a reverse stock split of all shares of its issued and outstanding Common Stock at a ratio of one-for-forty (1:40). The Company accounted for the reverse stock split on a retrospective basis pursuant to Accounting Standards Codification (“ASC”) 260, Earnings Per Share . All issued and outstanding common stock, common stock warrants, and share-based awards’ exercise prices and per share data have been adjusted in these condensed consolidated financial statements, on a retrospective basis, to reflect the reverse stock split for all periods presented. The number of authorized shares and par value of the preferred stock and common stock were not adjusted because of the reverse stock split. On June 13, 2025, the Company effected a reverse stock split of all shares of its issued and outstanding Common Stock at a ratio of one-for-eighty-five ( 1:85 ). The Company accounted for the reverse stock split on a retrospective basis pursuant to ASC 260, Earnings Per Share . All issued and outstanding common stock, common stock warrants, and share-based awards’ exercise prices and per share data have been adjusted in these condensed consolidated financial statements, on a retrospective basis, to reflect the reverse stock split for all periods presented. The number of authorized shares and par value of the preferred stock and common stock were not adjusted because of the reverse stock split. Basis of Presentation and Principles of Consolidation The Company’s condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of Onconetix and its 100 % wholly owned subsidiary, Proteomedix, since the acquisition date of December 15, 2023. All significant intercompany balances and transactions have been eliminated in consolidation. 6 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 1 — Organization and Basis of Presentation (cont.) Unaudited Interim Consolidated Financial Statements The accompanying condensed consolidated balance sheet as of September 30, 2025, and the condensed consolidated statements of operations and comprehensive loss and the condensed consolidated statements of convertible preferred stock and stockholders’ equity (deficit) for the three and nine months ended September 30, 2025 and 2024, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2025 and 2024 are unaudited. These unaudited interim consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements, and in management’s opinion, include all adjustments, consisting of only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of September 30, 2025 and its results of operations and comprehensive loss for the three and nine months ended September 30, 2025 and 2024, and its cash flows for the nine months ended September 30, 2025 and 2024. The financial data and the other financial information disclosed in the notes to these condensed consolidated financial statements related to the three-month periods are also unaudited. Operating results for the three and nine months ended September 30, 2025, are not necessarily indicative of the results that may be expected for the year ended December 31, 2025, any other interim periods, or any future year or period. The unaudited condensed consolidated financial statements included in this Report should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, which includes a broader discussion of the Company’s business and the risks inherent therein. Note 2 — Going Concern and Management’s Plans The Company’s operating activities to date have been devoted to seeking licenses, engaging in research and development activities, potential asset and business acquisitions, expenditures associated with the previously planned commercial launch of ENTADFI, and the commercialization of Proclarix. The Company has incurred substantial operating losses since inception and expects to continue to incur significant operating losses for the foreseeable future. As of September 30, 2025, the Company had cash of approximately $ 0.8 million, a working capital deficit of approximately $ 15.0 million and an accumulated deficit of approximately $ 136.9 million. During the nine months ended September 30, 2025, the Company used approximately $ 6.6 million in cash for operating activities. In addition, as of November 10, 2025, the Company’s cash balance was approximately $ 6.1 million. During the third quarter of 2025, the Company successfully closed a Series D financing, and in October 2025, it completed a Series E financing. These financings provided the Company with additional cash flow to support near-term operations. While these capital raises may enable the Company to sustain current operations and meet existing obligations, the Company continues to generate recurring net operating losses and has not yet established sustained positive cash flows to support its strategic growth initiatives, which includes the commercialization of Proclarix, and the development and commercialization of the Company’s future product candidates. These factors raise substantial doubt about the Company’s ability to continue as a going concern within one year from the date of the issuance of these condensed consolidated financial statements. Management’s plans for funding the Company’s operations include generating product revenue from sales of Proclarix, which is still subject to further successful development and commercialization activities within certain jurisdictions. Management also intends to pursue additional equity or debt financing to support operations and strategic initiatives. However, there are currently no committed sources of financing, and there is no assurance that additional funding will be available on favorable terms, if at all. This uncertainty raises significant concern about the Company’s ability to sustain operations and execute its strategic initiatives. If additional capital is not secured, the Company may need to curtail clinical trials, development, and commercialization efforts, and take further measures to reduce expenses to conserve cash. Because of historical and expected operating losses and net operating cash flow deficits, there is substantial doubt about the Company’s ability to continue as a going concern for one year from the issuance of the condensed consolidated financial statements, which is not alleviated by management’s plans. The condensed consolidated financial statements have been prepared under the going concern basis of accounting. These condensed consolidated financial statements do not include any adjustments that might be necessary from the outcome of this uncertainty. 7 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies During the nine months ended September 30, 2025, there were no changes to the Company’s significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. Selected significant accounting policies are discussed in further detail below: Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting periods. The most significant estimates in the Company’s condensed consolidated financial statements relate to accounting for acquisitions, valuation of inventory, estimates of future cash flows used to evaluate impairment of intangible assets, assumptions related to the pension benefit obligation, assumptions and accounting related to contingent warrant liabilities, warrant liabilities, and derivative liabilities, and accounting for income taxes. These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of expenses that are not readily apparent from other sources. Actual results may differ materially and adversely from these estimates. To the extent there are material differences between the estimates and actual results, the Company’s future results of operations will be affected. Segment Information Operating segments are defined as components of an enterprise about which separate discrete information is available for evaluation by the chief operating decision maker (“CODM”), or decision-making group, in deciding how to allocate resources and in assessing performance. As of September 30, 2025 and December 31, 2024, the Company was operating in one segment: commercial. Management’s determination of its operating segments is consistent with the financial information regularly reviewed by the CODM for purposes of evaluating performance, allocating resources, setting incentive compensation targets, and planning and forecasting for future periods. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. U.S. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: ● Level 1, defined as observable inputs such as quoted prices (unadjusted) for identical instruments in active markets; ● Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and ● Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. 8 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies (cont.) In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Financial instruments, including cash, inventory, accounts receivable, accounts payable, accrued liabilities, operating lease liabilities, and notes payable are carried at cost, which management believes approximates fair value due to the short-term nature of these instruments. The fair value of the contingent warrant liabilities, Series D warrant liabilities, Series D derivative liabilities and the related party subscription agreement liability are valued using significant unobservable measures and other fair value inputs and are therefore classified as Level 3 financial instruments. The fair value of financial instruments measured on a recurring basis is as follows as of September 30, 2025 and December 31, 2024: As of September 30, 2025 Description Total Level 1 Level 2 Level 3 Liabilities: Contingent warrant liabilities $ 53,149 — — $ 53,149 Series D warrant liabilities $ 12,815,000 — — $ 12,815,000 Series D derivative liabilities $ 988,000 — — $ 988,000 Total $ 13,856,149 $ — $ — $ 13,856,149 As of December 31, 2024 Description Total Level 1 Level 2 Level 3 Liabilities: Contingent warrant liabilities $ 43,089 — — $ 43,089 Subscription agreement liability – Related Party $ 4,123,000 — — $ 4,123,000 Total $ 4,166,089 $ — $ — $ 4,166,089 During the year ended December 31, 2024, the Company recorded full impairments of the intangible assets acquired from the acquisitions of Proteomedix and ENTADFI. These non-financial assets had been valued using significant unobservable measures and other fair value inputs and were classified as Level 3 measurements. None of the Company’s other non-financial assets or liabilities are recorded at fair value on a non-recurring basis as of September 30, 2025 and December 31, 2024. There were no transfers between levels during the periods presented. 9 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies (cont.) Revenue Recognition The following is a description of principal activities from which the Company generates its revenue: Development Services Proteomedix provides a range of services to life sciences customers referred to as “Development Services” including testing for biomarker discovery, assay design and development. These Development Services are performed under individual statement of work (“SOW”) arrangements with specific deliverables defined by the customer. Development Services are generally performed on a time and materials basis. During the performance and through completion of the service to the customer in accordance with the SOW, the Company has the right to bill the customer for the agreed upon price and recognizes the Development Services revenue over the period estimated to complete the SOW. The Company generally identifies each SOW as a single performance obligation. Completion of the service and satisfaction of the performance obligation under a SOW is typically evidenced by access to the data or test made available to the customer or any other form or applicable manner of delivery defined in the SOW. However, for certain SOWs under which work is performed pursuant to the customer’s highly customized specifications, the Company has the enforceable right to bill the customer for work completed, rather than upon completion of the SOW. For those SOWs, the Company recognizes revenue over a period of time during which the work is performed based on the expended efforts (inputs). As the performance obligation under the SOW is satisfied, any amounts earned as revenue and billed to the customer are included in accounts receivable. Product Sales The Company derives revenue through sales of its products, which includes Proclarix, its diagnostic product, directly to end users, including laboratories, hospitals, and medical centers, and to distributors. The Company considers customer purchase orders, which in some cases are governed by master sales agreements or standard terms and conditions, to be the contracts with a customer. For each contract, the Company considers the promise to transfer products, each of which is distinct, to be the identified performance obligations. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which it expects to be entitled. The Company fulfills its performance obligation applicable to product sales once the product is transferred to the customer. Other Revenue The Company generates other revenue including license revenue through agreements that grant third parties rights to use its intellectual property and proprietary materials. In September 2025, the Company entered into a license agreement with Immunovia AB, under which it granted exclusive rights to certain intellectual property and transferred biological materials related to the PancreaSure™ test. The agreement included a non-refundable upfront payment of $ 300,000 . Based on the terms of the agreement and the nature of the license, the Company determined that the performance obligations were satisfied upon the transfer of the licensed rights. Accordingly, the Company recognized the $ 300,000 as license revenue in the third quarter of 2025. During the three months ended September 30, 2025 and 2024, the Company recognized revenue of approximately $ 0.3 million and $ 0.4 million, respectively. During the nine months ended September 30, 2025 and 2024, the Company recognized revenue of approximately $ 0.5 million and $ 1.8 million, respectively. 10 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies (cont.) The Company’s revenue was generated from the following geographic regions during the three months ended September 30, 2025: European Union Non-European Union (UK) United States Development services — % — % — % Other revenue 100 % — % — % Product sales — % 100 % — % European Union Non-European Union (UK) United States Total Revenue Development services $ — $ — $ — $ — Other revenue 296,269 — — 296,269 Product sales — 7,382 $ — 7,382 Total $ 296,269 $ 7,382 $ — $ 303,651 The Company’s revenue was generated from the following geographic regions during the nine months ended September 30, 2025: European Union Non-European Union (UK) United States Development services 100 % — % — % Other revenue 100 % — % — % Product sales 93 % 7 % — % European Union Non-European Union (UK) United States Total Revenue Development services $ 1,630 $ — $ — $ 1,630 Other revenue 289,690 — — 289,690 Product sales 204,059 16,396 — 220,455 Total $ 495,379 $ 16,396 $ — $ 511,775 The Company’s revenue was generated from the following geographic regions during the three months ended September 30, 2024: European Union Non-European Union (UK) United States Development services 100 % — % — % Product sales — % 100 % — % European Union Non-European Union (UK) United States Total Revenue Development services $ 404,285 $ — $ — $ 404,285 Product sales — 2,574 — 2,574 Total $ 404,285 $ 2,574 $ — $ 406,859 11 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies (cont.) The Company’s revenue was generated from the following geographic regions during the nine months ended September 30, 2024: European Union Non-European Union (UK) United States Development services 100 % — % — % Product sales — % 16 % 84 % European Union Non-European Union (UK) United States Total Revenue Development services $ 1,732,699 $ — $ — $ 1,732,699 Product sales — 12,711 66,730 79,441 Total $ 1,732,699 $ 12,711 $ 66,730 $ 1,812,140 The Company had the following customer concentrations for its revenue during the three and nine months ended September 30, 2025 and 2024: For the Three Months Ended September 30, 2025 For the Nine Months Ended September 30, 2025 Development Services Product Sales Other Revenue Development Services Product Sales Other Revenue Customer A 100 % — % 100 % 100 % 93 % 100 % Customer C — % 31 % — % — % 2 % — % Customer D — % 69 % — % — % 5 % — % For the Three Months Ended September 30, 2024 For the Nine Months Ended September 30, 2024 Development Services Product Sales Other Revenue Development Services Product Sales Other Revenue Customer A 100 % — % — % 100 % — % — % Customer B — % — % — % — % 84 % — % Customer C — % 70 % — % — % 16 % — % Customer D — % 30 % — % — % — % — % 12 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 3 — Summary of Significant Accounting Policies (cont.) Any revenues earned but not yet billed to the customer as of the date of the condensed consolidated financial statements are recorded as contract assets and are included in prepaid expenses and other current assets in the accompanying condensed consolidated financial statements. The Company had no unbilled accounts receivable as of September 30, 2025 and December 31, 2024. Amounts recorded in contract assets are reclassified to accounts receivable in our condensed consolidated financial statements when the customer is invoiced according to the billing schedule in the contract. Accounts receivable was approximately $ 3,000 and $ 26,000 as of September 30, 2025 and December 31, 2024, respectively. In relation to customer contracts, the Company incurs costs to fulfill a contract but does not incur costs to obtain a contract. These costs to fulfill a contract do not meet the criteria for capitalization and are expensed as incurred. New Accounting Pronouncement s There were no new accounting pronouncements issued since the Company’s filing of the Annual Report on Form 10-K for the year ended December 31, 2024, which could have a significant effect on the accompanying condensed consolidated financial statements. Note 4 — Balance Sheet Details Inventories Inventories, which primarily relate to Proclarix products as of September 30, 2025 and December 31, 2024, consisted of the following: September 30, 2025 December 31, 2024 Raw materials $ 103,415 $ 57,446 Finished goods 48,141 6,633 Total $ 151,556 $ 64,079 Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following as of September 30, 2025, and December 31, 2024: September 30, 2025 December 31, 2024 Prepaid insurance $ 248,735 $ 101,999 Prepaid professional fees — 7,487 VAT taxes receivable 30,197 28,756 Prepaid other 22,384 33,894 Other receivable 10,046 41,835 Total $ 311,362 $ 213,971 13 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 4 — Balance Sheet Details (cont.) Intangible Assets Intangible assets acquired in connection with the ENTADFI and Proteomedix acquisitions were comprised of customer relationships, product rights for developed technology, and a trade name. These intangibles were fully impaired during the year ended December 31, 2024 resulting in a zero balance as of September 30, 2025 and December 31, 2024. Amortization for three and nine months ended September 30, 2024 The finite lived intangible assets held by the Company, which included customer relationships and product rights for developed technology, were amortized over their estimated useful lives of 15 years. For the three and nine months ended September 30, 2024, amortization expense related to the Company’s finite-lived intangible assets was approximately $ 198,000 and $ 596,000 , of which approximately $ 30,000 and $ 91,000 was recorded as selling, general, and administrative expenses and approximately $ 168,000 and $ 505,000 was recorded as cost of revenue in the accompanying condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2024. Impairment for three and nine months ended September 30, 2024 During the nine months ended September 30, 2024, the Company became aware of a new competitor that received approval by the FDA for a combined finasteride-tadalafil capsule, which is a direct competitor product to ENTADFI. This was determined to be a triggering event that could result in a decrease in future expected cash flows, and thus indicated the carrying amount of the ENTADFI asset group may not be fully recoverable. The Company performed an undiscounted cash flow analysis over the ENTADFI asset group and determined that the carrying value of the asset group is not recoverable. The Company then estimated the fair value of the asset group to measure the impairment loss for the period. Significant assumptions used to determine this non-recurring fair value measurement included projected sales driven by market share and product sales price estimates, associated expenses, growth rates, the discount rate used to measure the fair value of the net cash flows associated with this asset group, as well as Management’s estimates of an expected sales price for the asset group, and the probability of each potential strategic alternative taking place. The Company recorded an intangible asset impairment charge of approximately $ 0 and $ 3.5 million during the three and nine months ended September 30, 2024, respectively. Goodwill Goodwill consisted of the following as of September 30, 2025 and December 31, 2024: Balance as of December 31, 2024 $ 27,048,973 Impairment loss ( 10,918,000 ) Foreign currency translation 78,536 Balance as of March 31, 2025 $ 16,209,509 Impairment loss ( 594,000 ) Foreign currency translation 2,507,787 Balance as of June 30, 2025 18,123,296 Impairment loss — Foreign currency translation 57,003 Balance as of September 30, 2025 $ 18,180,299 Impairments for three and nine months ended September 30, 2025 and 2024 During the three and nine months ended September 30, 2025 and 2024, the Company’s stock price and market capitalization declined, and the Company determined that this was an indicator of a potential impairment of its goodwill. Accordingly, as of September 30, 2025 and 2024, the Company performed quantitative analysis to identify and measure the amount of impairment losses to be recognized. The Company did not recognize any goodwill impairment losses for the three months ended September 30, 2025 and 2024. The Company recognized goodwill impairment losses of approximately $ 11.5 million and $ 15.5 million for the nine months ended September 30, 2025 and 2024, respectively. The fair value estimate of the reporting units for the quarter ended September 30, 2025 was derived from the Company’s fully-diluted market capitalization using an indicative share price based on the 5- and 10-day trailing volume-weighted average price. 14 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 4 — Balance Sheet Details (cont.) Accrued Expenses Accrued expenses consisted of the following as of September 30, 2025 and December 31, 2024: September 30, 2025 December 31, 2024 Accrued compensation $ 34,080 $ 186,956 Accrued research and development 215,599 320,096 Accrued professional fees 202,219 161,981 Other accrued expenses 19,324 25,841 Accrued franchise taxes — 40,000 Accrued interest 879 139,409 Accrued license fees 4,188 14,705 Total $ 476,289 $ 888,988 Note 5 — Significant Agreements Services Agreement On July 21, 2023, the Company, entered into a Licensing and Services Master Agreement (“Master Services Agreement”) and a related statement of work with a vendor, pursuant to which the vendor was to provide to the Company commercialization services for the Company’s products, including recruiting, managing, supervising and evaluating sales personnel and providing sales-related services for such products, for fees totaling up to $ 29.1 million over the term of the statement of work. The statement of work had a term through September 6, 2026, unless earlier terminated in accordance with the Master Services Agreement and the statement of work. On July 29, 2023, a second statement of work was entered into with the same vendor for certain subscription services providing prescription market data access to the Company. The fees under the second statement of work totaled approximately $ 800,000 , and the term was through July 14, 2025 . On October 12, 2023, the Company terminated the Master Services Agreement and the statements of work. During 2023, the Company recognized a termination fee of approximately $ 1.4 million included in selling, general and administrative expense. Subsequently during 2024, the Company agreed with the vendor to pay a reduced termination fee of approximately $ 0.9 million and recorded net credits of $ 0.5 million for the difference in the termination fee related to this contract during the year ended December 31, 2024, which was included in selling, general and administrative expense for the year then ended. During the nine months ended September 30, 2025, the Company settled the remaining balance of the termination fee and recognized a $ 0.9 million gain on forgiveness of accounts payable in the accompanying condensed consolidated statement of operations and comprehensive loss. Laboratory Corporation of America On March 23, 2023, Proteomedix entered into a license agreement with LabCorp, pursuant to which LabCorp has the exclusive right to develop and commercialize Proclarix, and other products developed by LabCorp using Proteomedix’s intellectual property covered by the license, in the United States (“Licensed Products”). In consideration for granting LabCorp an exclusive license, Proteomedix received an initial license fee in the mid-six figures upon signing of the contract. Additionally, Proteomedix is entitled to royalty payments of between 5 % and 10 % on the net sales recognized by LabCorp of any Licensed Products plus milestone payments as follows: ● After the first sale of Proclarix as a laboratory developed test, LabCorp will pay an amount in the mid-six figures; ● After LabCorp achieves a certain amount in the low seven figures in net sales of Licensed Products, LabCorp will pay Proteomedix an amount in the low seven figures; and ● After a certain amount in the mid-seven figures in net sales of Licensed Products, LabCorp will pay Proteomedix an amount in the low seven figures. 15 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 5 — Significant Agreements (cont.) The total available milestone payments available under the terms of this contract is $ 2.5 million. An additional $ 0.5 million was paid to Proteomedix as an initial license fee in 2023. LabCorp is wholly responsible for the cost, if any, of research, development and commercialization of Licensed Products in the United States but has the right to offset a portion of those costs against future royalty and milestone payments. Additionally, LabCorp may deduct royalties or other payments made to third parties related to the manufacture or sale of Licensed Products up to a maximum amount of any royalty payments due to Proteomedix. The license agreement and related royalty payment provisions expire during 2038, which approximates the expiration of the last patent covered by the license agreement. LabCorp has the right to terminate the license agreement for any reason by providing 90 days written notice to Proteomedix. Either party may terminate the license agreement due to a material breach of the terms of the license agreement with 30 days’ notice, provided such breach is not cured within the foregoing 30 -day period. Finally, Proteomedix may terminate the license agreement with 60 days’ notice in the event LabCorp fails to make any undisputed payment due, provided that LabCorp does not remit the payment within the foregoing 60 -day period. As of September 30, 2025, the sale of Licensed Products by LabCorp under the license agreement has not commenced. The Company has sold product to LabCorp for their use in internal trials of the test. Immunovia AB On September 17, 2025, Proteomedix entered into a license agreement with Immunovia AB, pursuant to which Immunovia obtained exclusive rights to certain intellectual property and proprietary biological materials related to the PancreaSure™ test. In exchange for these rights, Immunovia paid Proteomedix a non-refundable upfront license fee of $ 300,000 . Based on the terms of the agreement and the nature of the license, the Company determined that the performance obligations were satisfied upon the transfer of the licensed rights. Accordingly, the Company recognized the $ 300,000 as license revenue in the third quarter of 2025. Additionally, the agreement provides for a second payment of $ 300,000 due by March 31, 2026. Under the terms of the agreement, Immunovia is responsible for the development, manufacturing, and commercialization of the PancreaSure™ test in the United States. Proteomedix is also entitled to receive royalty payments based on net sales of the licensed product. The royalty structure includes a tiered percentage of net sales of 3 %, depending on sales volume thresholds. Immunovia may deduct certain third-party costs related to the manufacture or sale of the licensed product from the royalty payments, subject to specified limits. The license agreement includes customary termination provisions, including termination for convenience with advance notice, and termination for material breach or non-payment. The agreement does not require Proteomedix to provide ongoing services or support following the initial transfer of rights and materials. As of September 30, 2025, the Company received the initial nonrefundable license payment of $ 300,000 , and the sale of the Licensed Products by Immunovia under the license agreement has not commenced. Note 6 — Notes Payable Veru Notes Payable As December 31, 2024, the Company had two non-interest-bearing notes payable outstanding with principal amounts of $ 5.0 million and initial maturity dates of April 19, 2024 (“April Veru Note”), and September 30, 2024 (“September Veru Note” and together with the April Veru Note, the “Veru Notes”), respectively. In accordance with the Veru Notes, no principal payments are due until maturity; however, the Company may voluntarily prepay the Veru Notes with no penalty. Additionally, in an Event of Default, as defined in the Veru Notes, the unpaid principal amount of the Veru Notes will accrue interest at a rate of 10.0 % per annum. The Company imputed interest on the Veru Notes using an average discount rate of 8.2 % and recorded a debt discount of approximately $ 1.1 million at the issuance date. The debt discount is reflected as a reduction in the carrying amount of the Notes and amortized to interest expense through the respective maturity dates, using the effective interest method. 16 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 6 — Notes Payable (cont.) On April 24, 2024, the Company entered into a forbearance agreement with Veru (the “Original Forbearance Agreement”) due to the Company’s failure to repay the principal balance on the $ 5.0 million note payable that had a maturity date of April 19, 2024 (the “April Veru Note”). Pursuant to the Original Forbearance Agreement, Veru will forbear from exercising its rights and remedies under the April Veru Note as a result of this default, until March 31, 2025 (the “April 2024 Forbearance Period”). Interest will accrue on any unpaid principal balance of the April Veru Note at a rate of 10 % per annum, commencing on April 20, 2024 through the date that the outstanding principal balance under the April Veru Note is paid in full. Any such accrued interest will become immediately due and payable upon the earlier of (i) certain events of default under the April Veru Note or the $ 5.0 million note payable that matures on September 30, 2024 (the “September Veru Note”), (ii) a payment default under the September Veru Note and (iii) the final payment of any principal amount payable under the September Veru Note. No interest was to accrue under the September Veru Note during the April 2024 Forbearance Period unless an Event of Default (as defined in the Original Forbearance Agreement) occurs, in which case interest will accrue from and after the date on which such default occurs. In consideration for Veru’s entrance into the Original Forbearance Agreement, the Company agreed to pay Veru: ● $ 50,000 of the principal due under the April Veru Note, which was paid on April 25, 2024, and up to $ 10,000 of out-of-pocket expenses incurred by Veru in connection with the Original Forbearance Agreement; ● 15 % of (i) the monthly cash receipts of Proteomedix for the licensing or sale of any products or services, (ii) monthly cash receipts of the Company or any of its subsidiaries for the sales of Proclarix anywhere in the world, and (iii) monthly cash receipts of the Company or any of its subsidiaries for milestone payments or royalties from LabCorp; and ● 10 % of the net proceeds from any financing or certain asset sale, transfer or licensing transactions that are consummated prior to March 31, 2025. The Company also agreed to a general release of claims against Veru and its representatives arising out of or relating to any act or omission thereof prior to April 24, 2024. The Company determined that the Original Forbearance Agreement should be accounted for as a modification of the April Veru Note and the September Veru Note in accordance with ASC 470-50, Debt - Modifications and Extinguishments (“ASC 470”), as the change in cash flows expected under the April Veru Note and the September Veru Note was not substantial. A new effective interest rate was established based on the carrying value of the original Notes and the revised cash flows and no gain or loss was recorded. On September 19, 2024, the Company entered into an Amended and Restated Forbearance Agreement with Veru (the “Amended and Restated Forbearance Agreement” or “A&R Forbearance Agreement”), which amends and restates the Original Forbearance Agreement in its entirety. Pursuant to the A&R Forbearance Agreement, Veru will forbear from exercising its rights under both the April Veru Note and the September Veru Note, subject to the terms and conditions set forth below. The A&R Forbearance Agreement extends the due date for the April 2024 and September 2024 Veru Notes until the earlier to occur of (i) June 30, 2025 or (ii) the occurrence of any Event of Default. The Amended and Restated Forbearance Agreement also effected certain modifications to the payment terms in the Original Forbearance Agreement and amended certain terms of the September Veru Note as summarized below. Pursuant to the A&R Forbearance Agreement, the Company agreed to make the following required payments (the “Required Payments”) during the April 2024 Forbearance Period, first to accrued and unpaid interest under the April Veru Note and then any remainder to the outstanding principal amount of the April Veru Note: ● Interest at the rate of 10 % per annum shall accrue on any unpaid principal balance of the April Veru Note commencing on April 20, 2024 through the date that the outstanding principal balance under the April Veru Note is paid in full; ● Monthly payments equal to 25 % (increased from 15 % in the Original Forbearance Agreement) of (i) the monthly cash receipts of Proteomedix for the licensing or sale of any products or services, (ii) monthly cash receipts of the Company or any of its subsidiaries for the sales of Proclarix anywhere in the world, and (iii) monthly cash receipts of the Company or any of its subsidiaries for milestone payments or royalties from LabCorp cash receipts of the Company of its subsidiaries from certain sale or licensing revenues or payments (the “Ordinary Cash Revenue”), which increased amount began October 20, 2024 for cash receipts in September 2024; 17 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 6 — Notes Payable (cont.) ● Payment of 20 % (increased from 10 % in the Original Forbearance Agreement) of the net proceeds from certain financing or other transactions outside the ordinary course of business completed by the Company or any of its subsidiaries during the April 2024 Forbearance Period, which increased amount will begin for any net proceeds received after September 19, 2024; and ● The remaining balance of the April Veru Note will be due at the end of the April 2024 Forbearance Period. The Company and Veru also agreed to the following amendments to the September Veru Note in the A&R Forbearance Agreement: ● As noted above, an extension of the maturity date to June 30, 2025; ● The accrual of interest at the rate of 10 % per annum on any unpaid principal balance of the September Veru Note commencing on October 1, 2024 through the date that the outstanding principal balance under the September Veru Note is paid in full; ● Any amounts owed on the September Veru Note, including but not limited to unpaid principal and accrued interest, will be paid in cash or, upon the mutual written consent of Veru and the Company, in shares of the Company’s Common Stock or a combination of cash and the Company’s Common Stock; ● Following full repayment of all principal and interest under the April Veru Note, the Company will make the Required Payments first towards accrued and unpaid interest under the September Veru Note and then towards the remaining principal balance payable under the September Veru Note; and ● If the aggregate unpaid principal outstanding under the April Veru Note and the September Veru Note and all accrued and unpaid interest thereon is repaid in cash on or before December 31, 2024, then the total principal balance under the September Veru Note that will be payable by the Company in satisfaction of its obligations under the September Veru Note will be reduced from $ 5.0 million to $ 3.5 million. The Company determined the A&R Forbearance Agreement should be accounted for as a modification of both the April and September Veru Notes in accordance with ASC 470-50, Debt - Modifications and Extinguishments (“ASC 470”), as the change in cash flows expected under the April Veru Note and the September Veru Note was not substantial. A new effective interest rate was established based on the carrying value of the original Notes and the revised cash flows and no gain or loss was recorded. On November 26, 2024, the Company entered into another Amended and Restated Forbearance Agreement with Veru (the “November Amended and Restated Forbearance Agreement” or “November A&R Forbearance Agreement”), which amends and restates certain terms of the Amended and Restated Forbearance Agreement. Pursuant to the November A&R Forbearance Agreement, Veru agreed to waive the due date for payment of applicable Cash Receipt Payments (as such term is defined in the A&R Forbearance Agreement) generated in October 2024 until the Company receives funds of at least $ 97,000 pursuant to its equity line of credit facility with Keystone Capital Partners LLC. In exchange, the Company agreed to increase its payments to be made to Veru out of future financing and strategic transactions through June 30, 2025, from 20 % to 25 % of net proceeds generated from such transactions. All other terms of the A&R Forbearance Agreement with Veru remain the same. Management has evaluated and concluded that there is no accounting impact from the A&R Forbearance Agreement with Veru. On March 31, 2025, Veru and the Company entered into a waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the April Veru Note to April 14, 2025. On April 23, 2025, Veru and the Company entered into a limited waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the April Veru Note to June 30, 2025. 18 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 6 — Notes Payable (cont.) On June 30, 2025, Veru and the Company entered into a limited waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the Veru Notes to July 31, 2025. On July 31, 2025, Veru and the Company entered into a waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the Veru Notes to August 14, 2025. On August 7, 2025, Veru and the Company agreed to amend and restate the September Veru Note to increase the principal amount owed to Veru by $ 100,000 to an aggregate principal amount of $ 5.1 million and extend the maturity date to August 14, 2025 . All other terms of the September Veru Note remained the same. On August 14, 2025, Veru and the Company entered into a waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the April Veru Note and the September Veru Note to August 31, 2025. On August 28, 2025, Veru and the Company agreed to amend and restate the September Veru Note. Pursuant to the September Veru Note, the principal amount owed to Veru was increased by $ 100,000 to an aggregate principal amount of $ 5.2 million, and the maturity date was amended to September 19, 2025 . All other terms of the September Veru Note remained the same. On August 28, 2025, Veru and the Company also entered into a waiver agreement, pursuant to which Veru agreed to waive and extend the date for payment of the September Veru Note to September 19, 2025. On September 22, 2025, approximately $ 8.8 million was payable to Veru under the Veru Notes and related amendments. On September 22, 2025, the Company and Veru entered into a Settlement Agreement and Release (the “Veru Settlement Agreement”), pursuant to which Veru agreed to accept a cash payment of approximately $ 6.3 million (including interest accrued through receipt of the Settlement Amounts (as defined herein)), 3,125 shares of Series D Preferred Stock (as defined below) and 846,975 Series D Warrants (as defined below) from a Series D PIPE Financing (as defined below) entered between the Company and certain institutional investors on September 22, 2025 (such cash payment, shares of Series D Preferred Stock and Series D Warrants, collectively, the “Settlement Amounts”) in full satisfaction of all amounts due under the Veru Notes, as amended by all preceding amendments, forbearance agreements, and waivers, and Veru agreed that such acceptance constituted complete discharge of all obligations thereunder. The Settlement Agreement contains customary release provisions that upon timely delivery of the Settlement Amounts, Veru shall release all claims or actions against the Company. The transaction was accounted for as a debt extinguishment in accordance with ASC 405-20 and ASC 470-50. The Company derecognized the carrying amount of the Veru Notes and recognized a gain or loss on extinguishment equal to the difference between the reacquisition price—measured at the fair value of the cash and equity instruments transferred—and the net carrying value of the debt. The Company recognized a loss on extinguishment related to this transaction of $ 3,516,811 recorded within loss on extinguishment of notes payable in the accompanying condensed consolidated statement of operations and comprehensive loss for the three and nine months ended September 30, 2025. On September 24, 2025, Veru confirmed receipt of all Settlement Amounts in satisfaction of all outstanding amounts, and all Veru Notes and related amendments were deemed cancelled and terminated, respectively, and of no further force or effect. During the three and nine months ended September 30, 2025, the Company recorded approximately $ 0.3 million and $ 0.8 million of interest expense, respectively, which includes accrued interest and amortization of the debt discount. The unamortized debt discount as of September 30, 2025 and December 31, 2024 was $ 0 and $ 5,000 , respectively. As of September 30, 2025 and December 31, 2024, the Company has recorded accrued interest of approximately $0 million and $ 0.1 million, respectively, which is included in accrued expenses in the accompanying condensed consolidated balance sheets. There are no future minimum principal payments on the Veru Notes as of September 30, 2025 as the Veru Notes are fully paid off and extinguished in accordance with the Veru Settlement Agreement. 19 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 6 — Notes Payable (cont.) Related Party Debenture On January 23, 2024, the Company issued a non-convertible debenture (the “Debenture”) to the PMX Investor, a related party, in the principal sum of $ 5.0 million, in connection with the Subscription Agreement discussed in Note 7. The Debenture has an interest rate of 4.0 % per annum, and the principal and accrued interest was originally payable in full upon the earlier of (i) the closing under the Subscription Agreement and (ii) June 30, 2024. Additionally, the $ 5.0 million subscription amount under the Subscription Agreement shall be increased by the amount of interest payable under the Debenture. On April 24, 2024, the maturity date of the related party debenture was extended to October 31, 2024 , through the execution of an extension agreement (the “Extension Agreement”) between the Company and the PMX investor. No other terms of the Debenture were modified in connection with the Extension Agreement. The Company considered the guidance of ASC 470-60, Troubled Debt Restructuring by Debtors , and concluded that the Extension Agreement should be accounted for as a troubled debt restructuring as the Company is experiencing financial difficulty and since the effective borrowing rate under the Extension Agreement is less than the effective borrowing rate under the original agreement, which indicates that a concession is deemed to have been granted. This did not result in a gain on restructuring as the future undiscounted cash outflows required under the Extension Agreement exceed the carrying value of the Debenture immediately prior to the extension. A new effective rate was established based on the carrying value of the original Debenture and the revised cash flows. In connection with the issuance of the Debenture, the Company incurred approximately $ 0.4 million in financing fees, which was recorded as a debt discount, and reflected as a reduction in the carrying amount of the Debenture. The debt discount is being amortized to interest expense through the maturity date. The Company did not incur any financing fees in connection with the Extension Agreement. On September 24, 2024, the Company converted all unpaid principal and accrued interest due under the Debenture into 500,000 units, attributable to principal, and 13,424 units, attributable to accrued interest, upon the closing of the Subscription Agreement. Each unit consisted of 1 share of common stock and 0.30 pre-funded warrants at an exercise price of $ 0.04 per share. As a result of the transaction, 513,424 shares of common stock were issued, and 154,027 pre-funded warrants were issued. As of December 31, 2024, there is no outstanding balance or accrued interest remaining on the Debenture. The remaining unamortized debt discount was immediately expensed upon settlement. The Company recorded approximately $ 0.2 million and $ 0.5 million of interest expense on the Debenture during the three and nine months ended September 30, 2024, respectively, which includes accrued interest and amortization of the debt discount. There was no such interest expense during the three and nine months ended September 30, 2025. Insurance Financing During the nine months ended September 30, 2025, the Company obtained financing for certain Director & Officer liability insurance policy premiums. The agreement assigns the lender a first priority lien on and security interest in the financed policies and any additional premium required in the financed policies. The total premiums, taxes and fees financed are approximately $ 0.5 million, with an annual interest rate of 7.25 %. In consideration of the premium payment by the lender to the insurance companies or the agent or broker, the Company unconditionally promised to pay the lender the amount financed plus interest and other charges permitted under the agreement. On September 30, 2025, the Company recognized approximately $ 0.05 million as an insurance financing note payable, which is now $ 0.05 million and included in the current portion of notes payable in the accompanying condensed consolidated balance sheets. The Company will pay the insurance financing through monthly installment payments of approximately $ 52,768 , with the last payment for the note due on November 17, 2025 . 20 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 6 — Notes Payable (cont.) Keystone Notes Payable During the nine months ended September 30, 2025, the Company issued six subordinated promissory notes to Keystone Capital Partners, LLC, each with an original issue discount and payable upon the earlier of (i) receipt of sufficient proceeds from the Company’s Equity Line of Credit (“ELOC”) with the Investor or (ii) a specified maturity date. All notes are subordinated to the Company’s existing debt obligations to Veru, do not initially bear interest, and are subject to a late charge of 15 % per annum on any unpaid amounts past due. ● On February 12, 2025, the Company issued a note with an aggregate principal amount of $ 117,647 , including an original issue discount of $ 17,647 . The note matures on November 12, 2025 , unless prepaid earlier upon receipt of sufficient capital from other securities offerings (the “February Keystone Note”). ● On May 16, 2025, the Company issued a note with an aggregate principal amount of $ 294,118 , including an original issue discount of $ 44,118 . The note matures on February 16, 2026 , subject to the same prepayment provisions (the “May Keystone Note”). ● On June 5, 2025, the Company issued a note with an aggregate principal amount of $ 147,059 , including an original issue discount of $ 22,059 . The note matures on March 5, 2026 , subject to the same prepayment provisions (the “June Keystone Note”). ● On August 6, 2025, the Company issued a note with an aggregate principal amount of $ 117,647 , including an original issue discount of $ 17,647 . The note matures on March 6, 2026 , subject to the same prepayment provisions (the “August 6 Keystone Note”). ● On August 28, 2025, the Company issued two notes with an aggregate principal amount of $ 58,824 each, including an original issue discount of $ 8,824 each. The notes mature on May 28, 2026 , subject to the same prepayment provisions (the “August 28 Keystone Notes”). On September 22, 2025, Keystone Capital Partners, LLC and the Company agreed to exchange the principal owed under the May Keystone Note, the June Keystone Note, the August 6 Keystone Note and the August 28 Keystone Notes for Series D Preferred Stock and Warrants in connection with the Series D PIPE Financing. The February Keystone Note has a balance as of September 30, 2025 of $ 113,725 and matures on November 12, 2025 . The transaction was accounted for as a debt extinguishment in accordance with ASC 405-20 and ASC 470-50. The Company derecognized the carrying amount of the Keystone Notes and recognized a gain or loss on extinguishment equal to the difference between the reacquisition price, measured at the fair value of the cash and equity instruments transferred, and the net carrying value of the debt. The Company recognized a loss on extinguishment related to this transaction of $ 1,867,908 recorded within loss on extinguishment of notes payable in the accompanying condensed consolidated statement of operations and comprehensive loss for the three and nine months ended September 30, 2025. During the three and nine months ended September 30, 2025, the Company recorded approximately $ 0.1 million and $ 0.1 million of amortization of the debt discount. The unamortized debt discount as of September 30, 2025 and December 31, 2024 was $ 4,000 and $ 5,000 , respectively. Note 7 — Subscription Agreement On December 18, 2023, the Company entered into a subscription agreement (the “Subscription Agreement”) with the PMX Investor, who became a stockholder of Onconetix at the closing of the PMX Transaction (see Note 11), for the sale of 5,882 units, each comprised of 1 share of common stock and 0.30 pre-funded warrants (the “Units”) at $ 850 per Unit. The Subscription Agreement includes a make-whole provision (the “Make-Whole Provision”) which requires the issuance of additional shares of common stock in the event that the 270-day volume weighted average price after the closing of the Subscription Agreement, is below $ 850 , and the PMX Investor still holds the common shares acquired upon closing of the Subscription Agreement 270 days after such closing. The Subscription Agreement would only close upon obtaining stockholder approval for certain transactions involving the Company’s Series B Preferred Stock. The Subscription Agreement was amended on January 23, 2024 to include a provision for interest on the $ 5 million debenture, accruing at a rate of 4 %, to be included in the calculation of the units to be issued upon the conversion. Stockholder approval was obtained on September 5, 2024, and as a result, the conversion and the issuance of 5,882 units, attributable to the Subscription Agreement, and 158 units, attributable to additional accrued interest under the debenture to the PMX Investor took place on September 24, 2024. On June 24, 2025, the 270 -day volume weighted average price after the closing of the Subscription Agreement was below $ 850 . In accordance with the Make-Whole Provision under the Subscription Agreement, the Company issued 241,514 shares of common stock (the “Make-Whole Shares”) to Altos Venture AG, following the determination that the 270 -day volume weighted average price (“Issuer VWAP”) was below the $ 850 threshold. The Company recorded common stock of $ 2 and additional paid in capital of $ 995,036 related to the issuance of the 241,514 shares in the accompanying condensed consolidated balance sheet as of September 30, 2025. 21 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 7 — Subscription Agreement (cont.) The Subscription Agreement was accounted for as a liability in accordance with ASC 480, Distinguishing Liabilities from Equity , (“ASC 480”), as the make-whole provision could result in a variable number of shares being issued upon settlement. The related party subscription agreement liability was measured at fair value at the commitment date and remeasured at each subsequent reporting period, with changes in fair value recorded as a component of other income (expense), net in the condensed consolidated statements of operations and comprehensive loss. During the nine months ended September 30, 2025, the subscription agreement liability - related party expired and was settled resulting in the recognition of $ 2 in common stock and $ 995,036 in additional paid in capital as of September 30, 2025. The following table summarizes the activity for the related party subscription agreement liability, using unobservable Level 3 inputs, for the three and nine months ended September 30, 2025: Subscription Agreement Liability Balance at December 31, 2024 $ 4,123,000 Change in fair value ( 3,319,000 ) Balance at March 31, 2025 $ 804,000 Change in fair value 191,038 Settlement ( 995,038 ) Balance at June 30, 2025 — Change in fair value — Balance at September 30, 2025 $ — As of September 30, 2025 and December 31, 2024, the fair value of the related party subscription agreement liability was approximately $ 0 and $ 4,123,000 , respectively. For the three and nine months ended September 30, 2025, the Company recognized a change in fair value of the related party subscription agreement liability of approximately $ 0 and $ 3,128,000 , respectively. The fair value was determined using a Monte-Carlo option pricing model, and as of December 31, 2024, the Company utilized 100 % probability that the Subscription Agreement will close. The significant assumptions used in the Monte-Carlo model, which utilizes Level 3 inputs (see Note 3), are as follows as of December 31, 2024: December 31, 2024 Exercise price $ 10 Term (years) 0.48 Expected stock price volatility 100 % Risk-free rate of interest 4.25 % Note 8 — Warrant and derivative liabilities Contingent warrant liabilities The following table summarizes the activity for the contingent warrant liabilities, using unobservable Level 3 inputs, for the three and nine months ended September 30, 2025: Contingent Warrant Liability Balance at December 31, 2024 $ 43,089 Change in fair value 9,795 Balance at March 31, 2025 $ 52,884 Change in fair value 229 Balance at June 30, 2025 53,113 Change in fair value 36 Balance at September 30, 2025 $ 53,149 22 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 8 — Warrant and derivative liabilities (cont.) Series D derivative liabilities and warrant liabilities On September 22, 2025, the Company completed a private placement transaction with institutional investors, resulting in the issuance of Series D convertible preferred stock and accompanying warrants to purchase shares of common stock. In connection with this transaction, the Company recorded warrant liabilities related to the Series D Warrants and derivative liabilities associated with certain embedded features in the Series D Preferred Stock. These instruments were classified as liabilities and measured at fair value in accordance with ASC 815 due to their settlement provisions and other contractual terms. Refer to Note 9 for further detail on the private placement transaction. The Company measured its bifurcated embedded derivative liabilities and warrant liabilities as of September 30, 2025 and September 22, 2025, at fair value on a recurring basis using level 3 inputs. These financial instruments are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment to estimation. The derivative liabilities and warrant liabilities were both measured using Monte Carlo valuation models. Valuations based on unobservable inputs are highly subjective and require significant judgments. Changes in such judgments could have a material impact on fair value estimates. The table below shows the inputs used to determine the fair value of the derivative liabilities: As of September 30, September 22, 2025 2025 Expected term (years) 2.98 3.0 Expected volatility 150.00 % 150.00 % Expected dividend yield 0.00 % 0.00 % Risk-free interest rate 3.58 % 3.56 % The table below shows the inputs used to determine the fair value of the warrant liabilities: As of September 30, September 22, 2025 2025 Expected term (years) 2.98 3.0 Expected volatility 150.00 % 150.00 % Expected dividend yield 0.00 % 0.00 % Risk-free interest rate 3.58 % 3.56 % The following table presents information about the Company’s derivative liabilities and warrant liabilities that are measured at fair value on a recurring basis as of September 30, 2025 and September 22, 2025, and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value: Valuation Level September 30, 2025 September 22, 2025 Warrant liabilities Level 3 $ 12,815,000 $ 14,749,000 Derivative liabilities Level 3 988,000 772,000 $ 13,803,000 $ 15,521,000 The following table sets forth a summary of the change in the fair value of the derivative liabilities and warrant liabilities that are measured at fair value on a recurring basis for the three and nine months ended September 30, 2025: Derivative Liabilities Warrant Liabilities Balance, as of December 31, 2024 - - Fair value recognized upon issuance $ 772,000 $ 14,749,000 Change in fair value 216,000 ( 1,934,000 ) Balance, as of September 30, 2025 $ 988,000 $ 12,815,000 23 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity Authorized Capital As of September 30, 2025 and December 31, 2024, the Company is authorized to issue 250,000,000 shares and 10,000,000 shares of common stock and preferred stock, respectively, with a par value of $ 0.00001 for both common stock and preferred stock. At September 30, 2025 and December 31, 2024, the Company had designated 1,150,000 shares, 10,000 shares, 2,700,000 shares, and 10,000 shares of Series Seed Preferred Stock, Series A Preferred Stock, Series B Preferred Stock, and Series C Preferred Stock, respectively. At September 30, 2025, the Company had designated 32,000 shares of Series D Preferred Stock. Preferred Stock Series Seed Convertible Preferred Stock The Company has 1,150,000 shares of preferred stock designated as Series Seed Preferred Stock (“Series Seed”) and there are no shares of Series Seed outstanding as of September 30, 2025 and December 31, 2024. Series A Convertible Preferred Stock On September 29, 2023, the Company filed a Certificate of Designations of Rights and Preferences of Series A Preferred Stock of the Company (the “Series A Certificate of Designations”) with the State of Delaware to designate and authorize the issuance of up to 10,000 shares of Series A Preferred Stock. On October 3, 2023, the Company issued 3,000 shares of Series A Convertible Preferred Stock in exchange for the settlement of $ 3.0 million in notes payable due to Veru, Inc. On September 24, 2024, Veru converted all 3,000 shares of Series A Convertible Preferred Stock into 1,679 shares of the Company’s common stock per the stated conversion ratio. There were 0 shares of Series A Convertible Stock outstanding as of September 30, 2025 and December 31, 2024. Series B Convertible Preferred Stock On December 15, 2023, the Company filed a Certificate of Designations of Rights and Preferences of Series B Convertible Preferred Stock of the Company (the “Series B Certificate of Designations”) with the State of Delaware to designate and authorize the issuance of up to 2,700,000 shares of Series B Preferred Stock. On December 15, 2023, in connection with the PMX Transaction, as part of the purchase consideration, the Company issued 2,696,729 shares of Series B Convertible Preferred Stock. The Series B Preferred Stock was initially convertible into approximately 79,315 shares of the Company’s common stock, upon Stockholder Approval as defined in the Series B Certificate of Designation. The Company evaluated the terms of the Series B Preferred Stock, and in accordance with the guidance of ASC 480, the Series B Preferred Stock was classified as temporary equity in the accompanying consolidated balance sheets, as the shares may be redeemable by the holders for cash, upon certain conditions that are not within the control of the Company. Additionally, the Company does not control the actions or events necessary to deliver the number of required shares upon exercise by the holders of the conversion feature. The Series B Preferred Stock was recorded at its fair value as of the issuance date. The Series B Preferred Stock was not previously redeemable or probable of becoming redeemable because it was subject to, among other things, Stockholder Approval as described above, and therefore the carrying amount was not accreted to its redemption value in prior periods. On September 5, 2024, Stockholder Approval was obtained, and on September 24, 2024, the Company effected the conversion of all 2,696,729 shares of Series B Preferred Stock into 79,315 shares of the Company’s common stock. 24 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) Series C Convertible Preferred Sock On October 1, 2024, the Board of Directors authorized the Company to create a series of 10,000 shares of preferred stock designated as “Series C Convertible Preferred Stock”, with a par value of $ 0.00001 , pursuant to the certificate of designations. At any time after the initial issuance date of Series C Convertible Preferred Stock (“Series C Preferred Stock”), each Preferred Share shall be convertible into validly issued, fully paid and non-assessable shares of Common Stock. The holders of Series C Preferred Stock are entitled to dividends, on an as-if converted basis, equal to and in the same form as dividends actually paid on shares of Common Stock, when and if actually paid. In addition, from and after the occurrence and during the continuance of any Triggering Event, dividends (“Default Dividends”) will accrue on the Stated Value of each Preferred Share at a rate of fifteen percent ( 15.0 %) (the “Default Rate”) per annum. Each holder is entitled to convert any portion of the outstanding Series C Preferred Stock held by such holder into validly issued, fully paid and non-assessable Conversion shares at the Conversion Rate, which can be determined by dividing (x) the Conversion Amount of such Preferred Share by (y) the Conversion Price, $ 4.5056 , subject to adjustment as provided in the Certificate of Designations. After the Stockholder Approval Date, if a Triggering Event occurs and is continuing at any time after the earlier of the holders’ receipt of a Triggering Event Notice and such holder becoming aware of such Triggering Event (such earlier date, the “Alternate Conversion Right Commencement Date”) and ending on the twentieth (20 th ) Trading Day after the later of (x) the date of such Triggering Event is cured and (y) such holder’s receipt of a Triggering Event Notice (such ending date, the “Alternate Conversion Right Expiration Date”), and each such period, an “Alternate Conversion Right Period”), such holder may, at such holder’s option, by delivery of a Conversion Notice to the Company (the date of any such Conversion Notice, each an “Alternate Conversion Date”), convert all, or any number of Preferred Shares held by such holder into shares of Common Stock at the Alternate Conversion Price (each, an “Alternate Conversion”). Alternate Conversion Price means, with respect to any Alternate Conversion that price will be the lowest of (i) the applicable Conversion Price as in effect on the applicable Conversion Date of the applicable Alternate Conversion, and (ii) the greater of (x) the Floor Price and (y) 80% of the lowest VWAP of the Common Stock during the five (5) consecutive Trading Day period ending and including the Trading Day immediately preceding the delivery or deemed delivery of the applicable Conversion Notice (such period, the “Alternate Conversion Measuring Period”). At any time, the Company has the right to redeem in cash all or part of the Series C Preferred Shares then outstanding at a price (the “Company Optional Redemption Price”) equal to 125% of the greater of (i) the Conversion Amount being redeemed and (ii) the product of (1) the Conversion Rate with respect to the Conversion Amount being redeemed multiplied by (2) the greatest closing sale price of the Company’s Common Stock on any Trading Day during the period commencing on the date immediately preceding the date the Company notifies the holders of its elections to redeem and the date the Company makes the entire payment required. Upon the occurrence of a Bankruptcy Triggering Event, the Company will immediately redeem, in cash, each of the Preferred Shares then outstanding at a redemption price equal to the greater of (i) the product of (A) the Conversion Amount to be redeemed multiplied by (B) 125% and (ii) the product of (X) the Conversion Rate with respect to the Conversion Amount in effect immediately following the date of initial public announcement of such Bankruptcy Triggering Event multiplied by (y) the product of (1) 125% multiplied by (2) the greatest closing sale price of the Common Stock on any Trading Day during the period commencing on the date immediately preceding such Bankruptcy Triggering Event and ending on the date the Company pays the entire payment required. The holders of the Series C Preferred Stock are entitled to be paid a cash amount equal to 30% of the gross proceeds in the event of any sale of common stock under the ELOC (as defined below) in accordance with the terms stated below within the ELOC securities purchase agreement. In no event may any Series C Preferred Shares be converted (or Series C Warrants be exercised) and shares of Common Stock be issued to any holder if after giving effect to the issuance of shares of Common Stock upon such conversion of the Series C Preferred Shares (or exercise of the Series C Warrants), the holder (together with its affiliates, if any) would beneficially own more than 4.99 % of the outstanding shares of Common Stock, which we refer to herein as the “Series C PIPE Blocker”. The Series C PIPE Blocker may be raised or lowered to any percentage not in excess of 9.99 % at the option of the applicable holder of the Series C Preferred Shares (or Series C Warrants), except that any raise will only be effective upon 61-days’ prior notice to the Company. On July 16, 2025, the Company exercised its voluntary Series C Preferred Stock adjustment right to lower the conversion price of the Series C Preferred Stock To $ 3.50 , and holders of 1,920 shares of Series C Preferred Stock agreed to convert their shares into shares of Common Stock. During the three and nine months ended September 30, 2025, 0 and 1,369 shares of Series C Preferred Stock was redeemed for an aggregate amount of $ 0 and $ 1.71 million, respectively, and 1,920 Series C Preferred Stock converted into common stock and 203 shares of Series C Preferred Stock were exchanged into 244 shares of Series D Preferred Stock (as defined below). As of September 30, 2025, 7 shares of Series C Preferred Stock remain outstanding, with a carrying value of $ 1.7 thousand, as reflected in the accompanying condensed consolidated balance sheet. 25 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) Series D Preferred Stock On September 22, 2025, the Company entered into a securities purchase agreement (the “Series D Securities Purchase Agreement” and the financing contemplated therein, the “Series D PIPE Financing”) with eleven institutional investors, and sold or exchanged debt, to such investors (collectively, the “Series D PIPE Investors”) an aggregate of 16,099 shares of Series D convertible preferred stock, par value $ 0.00001 per share (“Series D Preferred Stock”), which includes an issuance of 500 shares of Series D Preferred Stock to the lead investor in consideration for the Series D PIPE Investors’ irrevocable commitment to purchase shares of the Series D Preferred Stock, and warrants (the “Series D Warrants”) to purchase 4,362,827 shares of Common Stock, (the Series D Preferred Stock together with the Series D Warrants, the “Series D PIPE Securities”), for an aggregate purchase price of approximately $ 12.9 million and net cash proceeds of $ 9.3 million. The exercise price of the Series D Warrants is $ 3.6896 , and the Series D Warrants are exercisable beginning on the issuance date and expire on the third anniversary of the issuance date. Concurrently with entering into the Securities Purchase Agreement, the Company also entered into a registration rights agreement with the Series D PIPE Investors, pursuant to which it has agreed to provide the Series D PIPE Investors with certain registration rights related to the shares of Common Stock underlying the shares of Series D Preferred Stock and Series D Warrants. The extinguishment was achieved through a combination of cash payment and the issuance of Series D Preferred Stock and Series D Warrants. The transaction was accounted for as a debt extinguishment in accordance with ASC 405-20 and ASC 470-50. The Company derecognized the carrying amounts of the notes payable and recognized a gain or loss on extinguishment equal to the difference between the reacquisition price, measured at the fair value of the cash and equity instruments transferred, and the net carrying value of the debt. The Company recognized a loss on extinguishment related to this transaction of $ 5,384,719 recorded within loss on extinguishment of notes payable in the accompanying condensed consolidated statement of operations and comprehensive loss for the three and nine months ended September 30, 2025. The Series D Preferred Stock was determined to be more akin to an equity-like host than a debt-like host and was classified as permanent equity as it was not redeemable in any manner that would require classification outside of permanent equity pursuant to ASC 480-10-S99. The Series D Preferred Stock was recorded on the accompanying consolidated balance sheet at its par value. The Series D Warrants and certain embedded share-settled redemption features of the Series D Preferred Stock issued were determined to be liability-classified instruments pursuant to ASC 480 and ASC 815. The embedded features of the Series D Preferred Stock were bifurcated and accounted for separately as derivative liabilities. The Company measured both the warrant liabilities and bifurcated derivative liabilities at fair value on a recurring basis using Level 3 inputs as of September 22, 2025 (the issuance date) and September 30, 2025. The fair value of the derivative liabilities was $ 772,000 and $ 988,000 as of September 22 and September 30, 2025, respectively. The fair value of the warrant liabilities was $ 14,749,000 and $ 12,815,000 as of those same dates. See Note 8 for further information regarding the valuation methodology and assumptions used in determining the fair value of the warrant and derivative liabilities. In connection with the Series D PIPE Financing, the Company incurred direct and incremental expenses of $ 775,000 , comprised of legal fees and success fees, were expensed immediately. In addition to these issuance costs, the Company recognized a significant loss on issuance due to the fair value allocation requirements under US GAAP. Specifically, because the Series D Warrants and certain embedded features of the Series D Preferred Stock were determined to be liability-classified instruments pursuant to ASC 480 and ASC 815, they were initially measured at fair value upon issuance. The aggregate fair value of the Warrants $ 14,749,000 and the bifurcated derivative liabilities related to the Preferred Stock $ 772,000 , as determined by a third-party valuation specialist using a Monte Carlo simulation, exceeded the total gross proceeds received in the Series D PIPE Financing of $ 12,977,671 . As required by the guidance in ASC 470-20-25-2, when the fair value of financial liabilities required to be measured at fair value exceeds the net proceeds received, the excess is recognized as a loss in earnings at issuance. Accordingly, the Company recognized a loss on issuance of $ 2,543,329 , representing the excess of the fair value of the liability-classified instruments over the proceeds allocated to the transaction. The Series D Preferred Stock has no voting rights. The Series D Preferred Stock are convertible into common stock at the election of the holders of the Series D Preferred Stock at any time at an initial conversion price of $ 3.6896 per share. The conversion price is subject to customary adjustments for stock dividends, stock splits, reclassifications, stock combinations and the like (subject to certain exceptions), anti-dilution provisions, and a floor price of $ 0.74 . The Series D Preferred Stock is not redeemable by the holder except in the event of 1) a liquidation, dissolution, or winding up, or 2) the Series D Preferred Stock is redeemable for common stock of the Company upon the occurrence of a change in control. Holders of the Series D Preferred Stock shall be entitled to receive dividends as authorized and declared by the Company’s Board of Directors, payable in cash, securities, or in other assets as determined by the Company’s Board of Directors. 26 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) In the event of the Company’s liquidation, dissolution, or winding up, holders of the Series D Preferred Stock will be entitled to receive out of the assets, whether capital or surplus, an amount equal to the stated value of the Series D Preferred Stock, plus any accrued and unpaid dividends thereon and any other fees or liquidated damages owed before any distribution or payment shall be made to the holders of any junior securities. During the three and nine months ended September 30, 2025, the Company issued 16,343 in connection with the Series D financing, converting approximately 18 Series D Preferred Stock into common shares. As of September 30, 2025, 16,325 shares of Series D Preferred Stock remain outstanding. October 2024 Securities Purchase Agreement and ELOC On October 2, 2024, the Company entered into a Securities Purchase Agreement (the “Series C Securities Purchase Agreement”) with six institutional and accredited investors. The Company sold an aggregate of i) 3,499 Series C Preferred Stock, par value $ 0.00001 per, and (ii) a warrants to purchase 6,963 shares of common stock (the “Series C PIPE Warrants”), for aggregate cash proceeds of $ 2,000,000 . The Series C Warrants have an exercise price of $ 372.30 per share, subject to adjustment therein, and expire on the third anniversary of the initial exercisability date. The warrants issued with the Series C Redeemable Preferred Stock are accounted for as liabilities in accordance with ASC 815. Concurrently, on October 2, 2024, the Company entered into a Common Stock Equity Line of Credit Purchase Agreement (the “ELOC Purchase Agreement” and the equity line of credit, the “ELOC”) with an institutional investor, whereby the Company may sell up to $ 25,000,000 of the Company’s new issued Common Stock. Pursuant to the ELOC Purchase Agreement, the investor shall purchase from the Company up to the lesser of (i) $ 25.0 million in shares of our Common Stock and (ii) 19,512 shares, representing 19.99 % of the total number of shares of Common Stock outstanding immediately prior to the execution of the ELOC Purchase Agreement. Pursuant to the ELOC Purchase Agreement, 30 % of the gross proceeds to the Company from any sale of common stock thereunder must be applied towards the redemption of the Series C Redeemable Preferred Stock. Based on the terms of the Series C Redeemable Preferred Stock and the Company’s Certificate of Designation, and in accordance with ASC 480, the Series C Redeemable Preferred Stock is accounted for as mezzanine equity due to the contingent redemption feature upon any sale of common stock under the ELOC Purchase Agreement. The initial cash proceeds of $ 2,000,000 were allocated between the Series C Preferred Stock and derivative liability warrants, with the amount initially recorded in mezzanine equity based on the guidance in ASC 815 (i.e. the value of the derivative liability warrant is allocated its full fair value, and the residual is allocated to the Series C Redeemable Preferred Stock). The derivative liability warrants were measured at fair value at inception in the amount of $ 1,138,476 and the Series C Redeemable Preferred stock was measured at residual value of $ 861,524 . The Series C Redeemable Preferred Stock is subsequently measured at redemption value as they occur, with the difference between the basis per share of $ 246.22 and redemption value per share recorded as a deemed dividend in the statements of operations. During the year ended December 31, 2024, the Company received proceeds of $ 935,625 and recorded approximately $ 250,000 of shareholder receivable under the ELOC. In addition, the Company recorded a deemed divided in the amount of $ 206,404 in the consolidated statement of operations for the year ended December 31, 2024. During the three and nine months ended September 30, 2025, the Company received proceeds of $ 0 and $ 6,391,655 under the ELOC and recorded a deemed divided in the amount of $ 0 and $ 1,498,595 in the condensed consolidated statements of operations. Common Stock As of September 30, 2025 and December 31, 2024 there were 1,560,820 and 138,422 shares of common stock issued, respectively, and 1,560,668 and 138,270 shares of common stock outstanding, respectively. Treasury Stock On November 10, 2022, the Board approved a stock repurchase program (the “Repurchase Program”) to allow the Company to repurchase up to 125,000 shares of common stock with a maximum price of $ 1.00 per share, with discretion to management to make purchases subject to market conditions. On November 18, 2022, the Board approved an increase to the maximum price to $ 2.00 per share. There was no expiration date for this program and prices are not adjusted for the reverse stock split to comply with the program. There were no repurchases of common stock during the three and nine months ended September 30, 2025 and 2024. On November 13, 2024, the Board terminated the Repurchase Program. 27 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) Deferred offering costs associated with the ATM Agreement are reclassified to additional paid in capital on a pro-rata basis when the Company completes offerings under the ATM Agreement. Any remaining deferred costs will be expensed to the statements of operations should the planned offering be abandoned. As of December 31, 2024 and September 30, 2025, no shares have been sold under the ATM Offering, and the Company wrote off approximately $ 0.3 million of deferred offering costs in its consolidated balance sheets as of December 31, 2024. Warrants The following summarizes the Company’s outstanding warrants, excluding contingent warrants issuable upon exercise of the outstanding warrants as of September 30, 2025: Number of Shares WA Average Exercise Price WA Remaining Contractual Life (in years) Outstanding as of December 31, 2024 13,818 $ 568.38 2.92 Granted 4,362,834 3.69 — Exercised — — — Cancelled — — — Outstanding as of September 30, 2025 4,376,652 5.48 2.98 Warrants vested and exercisable as of September 30, 2025 4,376,652 $ 5.48 2.98 As of September 30, 2025, the Company had outstanding warrants, which are exercisable into 4,376,652 shares of common stock. The shares of common stock underlying the warrants outstanding had an exercise price of $ 5.48 per share. Series D Warrant Liabilities On September 22, 2025, the Company issued warrants to purchase 4,362,827 shares of common stock in connection with its Series D Preferred Stock PIPE financing. The warrants have an initial exercise price of $ 3.6896 per share, subject to adjustment for stock splits, dividends, dilutive issuances, and certain variable price securities. The warrants are exercisable for three years from the issuance date and may be exercised for cash or, under certain conditions, on a cashless basis. The warrants contain contingent redemption features, including a put right upon the occurrence of a fundamental transaction (such as a change of control), which may require the Company to repurchase the warrants for cash at their Black-Scholes value. As such, in accordance with ASC 480, the warrants are classified as liabilities and are initially measured at fair value, with subsequent changes in fair value recognized in earnings each reporting period. The fair value of the warrants at issuance was determined using a Monte Carlo simulation model, which was selected due to the complex terms of the warrants, including path-dependent reset provisions and contingent settlement outcomes. Key inputs to the valuation included expected term, volatility, risk-free interest rate, and dividend yield. The Company engaged a third-party valuation specialist to assist in the estimation of fair value. As of September 30, 2025, the fair value of Series D warrant labilities approximately totaling $ 12,815,000 included as warrant liabilities in the accompanying condensed consolidated balance sheets. The maximum number of warrants issuable upon settlement of the warrants was 4,362,827 for the Series D Warrants as of September 30, 2025. Refer to Note 8 for further information of the valuation inputs to the Series D warrants. Contingent Warrant Liabilities As of September 30, 2025, the fair value of contingent warrant labilities includes the Series C Warrants of $ 32,892 and those issuable upon exercise of the Inducement PIOs of approximately $ 20,257 totaling $ 53,149 included as contingent warrant liabilities in the accompanying condensed consolidated balance sheets. 28 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) As of December 31, 2024, the fair value of contingent warrant labilities includes the Series C Warrants of $ 32,982 and those issuable upon exercise of the Inducement PIOs of approximately $ 10,200 totaling $ 43,089 included as contingent warrant liabilities in the accompanying condensed consolidated balance sheets. The maximum number of warrants issuable upon settlement of the contingent warrants was 461 for the Inducement PIOs contingent warrants and 6,963 for the Series C Warrants as of September 30, 2025 and December 31, 2024. Onconetix Equity Incentive Plans The Company’s 2019 Equity Incentive Plan (the “2019 Plan”) was adopted by its board of directors and by its stockholders on July 1, 2019. On February 23, 2022 the Company’s board of directors adopted the Company’s 2022 Equity Incentive Plan (the “2022 Plan”), which is the successor and continuation of the Company’s 2019 Plan. Under the 2022 Plan, the Company may grant stock options, restricted stock, restricted stock units, stock appreciation rights, and other forms of awards to employees, directors, and consultants of the Company. In May 2023, the number of shares of common stock reserved for issuance under the 2022 Plan was increased to 926 , and in September 2024, the number of shares of common stock reserved for issuance under the 2022 Plan was increased to 17,058 . Stock-based awards granted during the three and nine months ended September 30, 2025 and 2024 were all granted under the 2022 Plan. As of September 30, 2025, there are 6,165 shares available for issuance under the 2022 Plan. Stock Options The following summarizes activity related to the Company’s stock options under the 2019 Plan and the 2022 Plan for the nine months ended September 30, 2025: Weighted Average Weighted Remaining Average Contractual Number of Exercise Life Shares Price (in years) Outstanding as of December 31, 2024 162 $ 13,258.74 7.9 Granted — — — Forfeited / cancelled ( 42 ) ( 11,507.45 ) — Exercised — — — Outstanding as of September 30, 2025 120 14,089.83 7.1 Options vested and exercisable as of September 30, 2025 118 $ 14,310.63 7.1 There were no stock options granted during the three and nine months ended September 30, 2025 and 2024. The aggregate fair value of stock options that vested during the three and nine months ended September 30, 2025, was approximately $ 17,000 and $ 109,000 , respectively, compared to $ 53,000 and $ 220,000 for the same periods in 2024. Restricted Stock On May 9, 2023, the Board’s Compensation Committee approved the issuance of restricted stock, granted under the Company’s 2022 Plan, to the Company’s executive officers, employees, and certain of the Company’s consultants. The restricted shares granted totaled 143 , of which 44 , 22 , and 44 were granted to the Company’s former CEO, former CFO, and former CBO, respectively. All of the restricted shares granted vest as follows: 50 % in January 2024, 25 % in August 2024, and 25 % in August 2025. In addition, on May 31, 2023, the Board’s Compensation Committee approved the issuance of 7 shares of restricted stock, granted to the Company’s non-executive Board members, with full vesting on May 31, 2024. On February 14, 2024, in connection with the appointment of a non-executive Board member, the Company issued 1 share of restricted stock, which vested in full on June 14, 2024. Furthermore, on September 26, 2024, the Company issued its Board members a total of 195 restricted stock, with full vesting August 31, 2025. On February 24, 2025, in connection with the appointment of an executive Board member, the Company issued 20 shares of restricted stock with full vesting August 31, 2025. Subsequently, the Company modified the vesting date of 137 shares previously issued to the Board members to provide for full vesting August 16, 2026. On August 15, 2025, the Company issued its Board members a total of 2,492 restricted stock, with full vesting August 16, 2026. 29 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 9 — Convertible Preferred Stock and Stockholders’ Equity (cont.) The following summarizes activity related to the Company’s restricted stock awards granted under the 2022 Plan for the nine months ended September 30, 2025: Weighted Average Number of Grant Date Shares Fair Value Nonvested as of December 31, 2024 211 $ 522.75 Granted 2,492 370.44 Vested — — Forfeited ( 112 ) 11.44 Nonvested as of September 30, 2025 2,591 $ 15.67 Proteomedix Stock Option Plan Proteomedix sponsors a stock option plan (the “PMX Option Plan”) which provides common stock option grants to be granted to certain employees and consultants, as was determined by the board of directors of Proteomedix. In connection with the PMX Transaction, the Company assumed the PMX Option Plan. Generally, options issued under the PMX Option Plan have a term of not more than 11 years and provide for a four-year vesting period. Stock options issued under the PMX Option Plan are measured at fair value using the Black-Scholes option pricing model. On April 16, 2024, the board of directors of Proteomedix approved a two-year extension of 144 vested stock options that were set to expire in April 2024. The extended expiration date for these options is April 18, 2026. The Company recorded approximately $ 18,000 of expense associated with this modification during the year ended December 31, 2024. There was no activity under the PMX Option Plan for the three and nine months ended September 30, 2025. In October 2024, 684 stock options were converted to shares with a weighted average exercise price of $ 294.10 . As of December 31, 2024 and September 30, 2025, there were no outstanding stock options. Stock-Based Compensation Stock-based compensation expense related to stock options and restricted stock, for the three and nine months ended September 30, 2025 and 2024 was as follows: For the Three Months Ended September 30, 2025 2024 Selling, general and administrative $ 9,795 $ 45,634 Research and development — — Total $ 9,795 $ 45,634 For the Nine Months Ended September 30, 2025 2024 Selling, general and administrative $ 70,033 $ 142,082 Research and development — ( 44,573 ) Total $ 70,033 $ 97,509 30 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 10 — Commitments and Contingencies Office Lease Proteomedix leases office and lab space in Zurich Switzerland. On April 1, 2024, the original lease was amended to add additional office and laboratory space. The lease amendment was accounted for as a separate lease, resulting in an additional right-of-use asset and lease liability of approximately $ 88,000 . In May 2025, Proteomedix entered into a lease amendment to reduce its leased premises. Effective June 30, 2025, the Company terminated the April 2024 lease amendment, which included office space and laboratory space. Additionally, a partial termination of a prior lease amendment further reduced the office space. As of September 30, 2025, the remaining leases resulted in a right-of-use asset and lease liability of approximately $ 6,155 . Lease payments for the remainder of the year ending December 31, 2025, are approximately $ 6,155 . The impact of these leases is considered immaterial to the Company’s condensed consolidated financial statements. Litigation From time to time, the Company may be subject to various legal proceedings and claims that arise in the ordinary course of its business activities. As of September 30, 2025, the Company is not a party to any material legal proceedings and is not aware of any pending or threatened claims. Termination of Ocuvex Merger Agreement On July 16, 2025, the Company entered into an Agreement and Plan of Merger with (i) Onconetix Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of the Company, and (ii) Ocuvex Therapeutics, Inc., a Delaware corporation (“Ocuvex”, and such agreement, the “Merger Agreement”). Pursuant to the Merger Agreement, Merger Sub will merge with and into Ocuvex, with Ocuvex surviving the merger as a direct, wholly owned subsidiary of the Company (the “Merger”). Effective September 24, 2025, pursuant to the terms of the Merger Agreement, the Company and Ocuvex entered into a Termination and Release Agreement (the “Termination Agreement”) pursuant to which they agreed to terminate the Merger Agreement and the transactions contemplated thereby. The Termination Agreement also provides for a mutual release of claims among the Company, Ocuvex and their affiliates and in consideration of the foregoing, the Company agreed to pay to Ocuvex, an amount equal to $ 302,343.55 (the “Termination Payment”), which represents all amounts payable by the Company to Ocuvex pursuant to the terms of the Merger Agreement. As of September 24, 2025, Ocuvex confirmed receipt of the Termination Payment, and as a result the Merger Agreement is of no further force and effect. 31 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 10 — Commitments and Contingencies (cont.) Registration Rights Agreements In connection with private placements consummated in April 2022 and August 2022, the Company entered into Registration Rights Agreements with the purchasers. Upon the occurrence of any Event (as defined in each Registration Rights Agreement), which, among others, prohibits the purchasers from reselling the securities for more than ten consecutive calendar days or more than an aggregate of fifteen calendar days during any 12-month period, and should the registration statement cease to remain continuously effective, the Company would be obligated to pay to each purchaser, on each monthly anniversary of each such Event, an amount in cash, as partial liquidated damages and not as a penalty, equal to the product of 2.0 % multiplied by the aggregate subscription amount paid by such purchaser in the private placements. As of September 30, 2025 and December 31, 2024, and as a result of the consummation of the remaining warrants associated with the April 2022 and August 2022 private placements, the Company has no further obligations pertaining to the Registration Rights Agreements. Indemnification In the normal course of business, the Company enters into contracts and agreements that contain a variety of representations and warranties and provide for general indemnifications. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future but have not yet been made. To date, the Company has not been required to defend any action related to its indemnification obligations. However, during the third quarter of 2023, the Company received a claim from its former CEO and a former accounting employee requesting advancement of certain expenses. The Company recorded approximately $ 209,000 in related expenses during the year ended December 31, 2023, of which approximately $ 159,000 was paid through reduction of the outstanding related party receivable due from the former CEO. The Company recorded a related accrual of approximately $ 50,000 , which was included in accrued expenses at December 31, 2023, and which was paid during 2024, and accordingly there is no related accrual as of September 30, 2025. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is not estimable at this time. Note 11 — Related Party Transactions On December 18, 2023, the Company entered into the Subscription Agreement with the PMX Investor, a 5 % stockholder of the Company as of September 30, 2025 (see Note 7). During the year ended December 31, 2024, the Company issued a non-convertible debenture in the principal amount of $ 5.0 million to the PMX Investor, in connection with the Subscription Agreement and has settled the principal and accrued interest through the issuance of shares (see Note 6). On February 6, 2024, the Company appointed Thomas Meier, PhD, as a member of the Company’s board of directors. Dr. Meier provides consulting services to Proteomedix, through a consulting agreement that was effective January 4, 2024. On June 17, 2025, the Company entered into a separate consulting agreement with a firm affiliated with Dr. Meier. The agreement provides for the payment of certain success fees and reimbursement of related expenses. Dr. Meier is entitled to receive 10 % of success fees earned by the affiliated firm. The Company recorded approximately $ 19,000 and $ 54,000 in related expenses during the three and nine months ended September 30, 2024, respectively. No related expenses were recorded during the three or nine months ended September 30, 2025. As of September 30, 2025, and December 31, 2024, no amounts related to this agreement were included in accounts payable. 32 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 12 — Income Taxes The Company’s tax provision for interim periods is determined using an estimate of the annual effective tax rate, adjusted for discrete items arising in that quarter. In each quarter, management updates the estimate of the annual effective tax rate, and any changes are recorded in a cumulative adjustment in that quarter. The quarterly tax provision and quarterly estimate of the annual effective tax rate are subject to significant volatility due to several factors, including management’s ability to accurately predict the portion of income (loss) before income taxes in multiple jurisdictions, and the effects of acquisitions and the integration of those acquisitions. There was no income tax provision or benefit recorded for the three and nine months ended September 30, 2025. For the three and nine months ended September 30, 2024, the Company recorded an income tax benefit of approximately $ 56,000 and $ 127,000 , respectively. This tax benefit was related to the Company’s deferred foreign taxes resulting from the Proteomedix acquisition and yielded an effective tax rate of 13.0 % for Proteomedix for the nine months ended September 30, 2024. The Company has incurred net operating losses for all of the periods presented and has not reflected any benefit in the accompanying condensed consolidated financial statements for its U.S. net operating loss carryforwards and only a partial benefit for its Swiss net operating loss carryforwards due to uncertainty around utilizing these tax attributes within their respective carryforward periods. The Company has recorded a full valuation allowance against its U.S. deferred tax assets as it is not more likely than not that such assets will be realized in the near future. As of December 31, 2024, all deferred tax liabilities, related to intangibles, on the books have been reversed creating an income tax benefit. All remaining deferred tax assets and deferred tax liabilities have a full valuation allowance booked against them therefore there were no additional income tax benefits during the three and nine months ended September 30, 2025. The Company’s policy is to recognize interest expense and penalties related to income tax as income tax expense. For the three and nine months ended September 30, 2025 and 2024, the Company has not recognized any interest or penalties related to income taxes. Note 13 — Net Loss Per Share Basic net loss per share is computed by dividing the net income or loss applicable to common shares by the weighted average number of common shares outstanding during the period. The weighted average number of shares of common stock outstanding includes pre-funded warrants because their exercise requires only nominal consideration for delivery of shares; it does not include any potentially dilutive securities or any unvested restricted shares of common stock. Certain restricted shares, although classified as issued and outstanding at September 30, 2025, are considered contingently returnable until the restrictions lapse and will not be included in the basic net loss per share calculation until the shares are vested. Unvested shares of the Company’s restricted stock do not contain non-forfeitable rights to dividends and dividend equivalents. The two-class method is used to determine earnings per share based on participation rights of participating securities in any undistributed earnings. Each share of preferred stock that includes rights to participate in distributed earnings is considered a participating security and the Company uses the two-class method to calculate net income available to the Company’s common stockholders per common share — basic and diluted. The following securities were excluded from the computation of diluted shares outstanding due to the losses incurred in the periods presented, as they would have had an anti-dilutive impact on the Company’s net loss: As of September 30, 2025 2024 Options to purchase shares of common stock 120 161 Warrants 4,376,652 6,864 Unvested shares of restricted stock 2,591 211 Common stock issuable upon conversion of Series C Redeemable Preferred Stock 1,553 — Common stock issuable upon conversion of Series D Redeemable Preferred Stock 4,424,599 — Total 8,805,515 7,236 33 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 14 — Defined Benefit Plan Proteomedix sponsors a defined benefit pension plan (the “Swiss Plan”) covering certain eligible employees. The Swiss Plan provides retirement benefits based on years of service and compensation levels. As of September 30, 2025, the Company’s defined benefit pension plan was fully terminated and settled. As a result of this settlement, all curtailment and settlement gains have been recognized in the current period. Accordingly, the projected benefit obligation is zero , and there are no remaining assets or liabilities associated with the defined benefit plan as of the reporting date. The following significant actuarial assumptions were used in calculating the benefit obligation and the net periodic benefit cost as of September 30, 2025 and December 31, 2024: September 30, 2025 December 31, 2024 Discount rate 1.10 % 1.00 % Expected long-term rate of return on plan assets 1.10 % 1.00 % Rate of compensation increase 1.50 % 1.50 % Changes in these assumptions may have a material impact on the plan’s obligations and costs. The components of net periodic benefit cost for the three and nine months ended September 30, 2025 and 2024, which is included within selling, general and administrative expenses in the accompanying condensed consolidated statements of operations and comprehensive loss, are as follows: For The Three Months Ended September 30, 2025 For The Three Months Ended September 30, 2024 Service cost $ 9,703 $ 24,912 Interest cost 5,549 7,638 Expected return on plan assets ( 2,260 ) 5,606 Amortization of net (gain) ( 6,719 ) 3,686 Curtailment (gain) recognized ( 146,804 ) — Settlement gains* ( 284,647 ) — Total $ ( 425,178 ) $ 41,842 * Settlement gains of $ 284,647 were primarily attributable to a reduction in projected future benefit obligations resulting from a termination and full settlement of the plan. For The Nine Months Ended September 30, 2025 For The Nine Months Ended September 30, 2024 Service cost $ 56,867 $ 73,356 Interest cost 14,992 22,489 Expected return on plan assets ( 13,250 ) ( 17,480 ) Amortization of net (gain) ( 21,850 ) ( 11,491 ) Curtailment (gain) recognized ( 146,804 ) — Settlement gains ( 795,594 ) — Total $ ( 905,639 ) $ 66,874 During the three months ended September 30, 2025 and 2024, the Company made pension contributions of approximately $ 3,000 and $ 23,000 , respectively. During the nine months ended September 30, 2025 and 2024, the Company made pension contributions of approximately $ 45,000 and $ 66,000 , respectively. 34 ONCONETIX, INC. Notes to Condensed Consolidated Financial Statements September 30, 2025 (Unaudited) Note 15 – Segment Information The Company conducts its business activities and reports financial results as one business segment. The presentation of financial results as one reportable segment is consistent with the way the Company operates its business and is consistent with the manner in which the Chief Operating Decision Maker (“CODM”) evaluates performance and makes resource and operating decisions for the business. The Company’s CODM is the Chief Executive Officer . Furthermore, the Company notes that monitoring financial results as one reportable segment helps the CODM manage costs on a consolidated basis, consistent with the integrated nature of the operations. The CODM uses net loss, as reported on the Consolidated Statements of Operations and Comprehensive Loss, in evaluating performance of the Company and determining how to allocate resources of the Company as a whole. As the CODM evaluates performance on a consolidated basis, all required financial segment information is included in the consolidated financial statements. Geographic Information The distribution of revenue by geographical area was as follows: Three Months Ended September 30, 2025 2024 United States $ — $ — United Kingdom 7,382 1,789 Switzerland 296,269 405,070 Total $ 303,651 $ 406,859 Nine Months Ended September 30, 2025 2024 United States $ — $ 66,730 United Kingdom 16,396 12,711 Switzerland 495,379 1,732,699 Total $ 511,775 $ 1,812,140 Note 16 — Subsequent Events Series E PIPE Financing On October 1, 2025, the Company entered into a securities purchase agreement (the “Series E Securities Purchase Agreement”) with institutional investor(s) and sold to such institutional investors(s) (collectively, the “Series E PIPE Investors”), an aggregate of 7,813 shares of Series E convertible preferred stock, par value $ 0.00001 per share (“Series E Preferred Stock”), which are convertible into common stock of the Company, $ 0.00001 par value per share and warrants (the “Series E Warrants”) to purchase 2,025,223 shares of Common Stock, for an aggregate purchase price of approximately $ 6.25 million, which was also equal to the net cash proceeds. The exercise price of the Series E Warrants is $ 3.8576 , and the Series E Warrants are exercisable beginning on the issuance date and expire on the third anniversary of the issuance date. Concurrently with entering into the Series E Securities Purchase Agreement, the Company also entered into a registration rights agreement with the Series E PIPE Investors, pursuant to which it has agreed to provide the Series E PIPE Investors with certain registration rights related to the shares of Common Stock underlying the shares of Series E Preferred Stock and Series E Warrants. 35