NIOCORP DEVELOPMENTS LTD 10-Q

ITEM 5. OTHER INFORMATION Rule 10b5-1 Trading Arrangements During the quarter ended March 31, 2026 , no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of Regulation S-K). ITEM 6. EXHIBITS Exhibit No. Title 3.1(1) Notice of Articles dated April 5, 2016 3.2(1) Articles, as amended, effective as of January 27, 2015 3.3(2) Amendment to Articles, effective March 17, 2023 4.1(3) Placement Agency Agreement, dated as of February 24, 2026, by and between NioCorp Developments Ltd. and Maxim Group LLC 4.2(3) Form of February Pre-Funded Warrant (included in Exhibit 4.1) 4.3(4) Amended and Restated Shareholder Rights Plan Agreement, dated as of April 6, 2026, by and between NioCorp Developments Ltd. and Computershare Investor Services Inc. as rights agent (or any successor rights agent) 10.1(4)# NioCorp Developments Ltd. Long-Term Incentive Plan, as amended through April 6, 2026 31.1 Certification of Chief Executive Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 31.2 Certification of Chief Financial Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 32.1 Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 32 32.2 Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 95.1 Mine Safety Disclosure 101.INS(5) Inline XBRL Instance Document 101.SCH(5) Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) # Management compensation plan, arrangement, or agreement. (1) Previously filed as an exhibit to the Company’s Draft Registration Statement on Form S-1 (Registration No. 377-01354) submitted to the SEC on July 26, 2016, and incorporated herein by reference. (2) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 001-41655) filed with the SEC on March 17, 2023, and incorporated herein by reference. (3) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 001-41655) filed with the SEC on February 25, 2026, and incorporated herein by reference. (4) Previously filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 001-41655) filed with the SEC on April 6, 2026, and incorporated herein by reference. (5) Submitted Electronically Herewith. Attached as Exhibit 101 to this report are the following formatted in inline XBRL (Extensible Business Reporting Language): (i) the Interim Condensed Consolidated Balance Sheets as of March 31, 2026 and June 30, 2025, (ii) the Interim Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) for the Three and Nine Months ended March 31, 2026 and 2025, (iii) the Interim Condensed Consolidated Statements of Cash Flows for the Nine Months ended March 31, 2026 and 2025, (iv) the Interim Condensed Consolidated Statements of Shareholders’ Equity and Redeemable Noncontrolling Interest for the Three and Nine Months ended March 31, 2026 and 2025 and (v) the Notes to the Interim Condensed Consolidated Financial Statements. 33 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. NIOCORP DEVELOPMENTS LTD. (Registrant) By: /s/ Mark A. Smith Mark A. Smith President, Chief Executive Officer and Executive Chairman (Principal Executive Officer) Date: May 14, 2026 By: /s/ Neal Shah Neal Shah Chief Financial Officer (Principal Financial and Accounting Officer) Date: May 14, 2026 34