Seneca Bancorp, Inc. 10-Q

Item 5. Other Information During the three months ended September 30, 2025, n o n e of the Company’s directors or executive officers adopted or terminated any contract, instruction or written plan for the purchase or sale of the Company’s securities that was intended to satisfy the affirmative defense conditions of SEC Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement“ (as such term is defined in Item 408 of SEC Regulation S-K). ​ 57 Table of Contents Item 6. Exhibits ​ ​ ​ 3.1 Articles of Incorporation of Seneca Bancorp, Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Registration Statement on Form S-1, as amended (Commission File No. 333-288044), initially filed on June 13, 2025) ​ ​ ​ 3.2 ​ Bylaws of Seneca Bancorp, Inc. (incorporated by reference to Exhibit 3.2 to the Company’s Registration Statement on Form S-1, as amended (Commission File No. 333-288044), initially filed on June 13, 2025) ​ ​ ​ 31.1 ​ Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ 31.2 ​ Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ 32.1 ​ Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ 32.2 ​ Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ 101 ​ The following materials for the quarter ended September 30, 2025, formatted in Inline XBRL (Extensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Net Income, (iii) Consolidated Statements of Comprehensive Income (Loss), (iv) Consolidated Statements of Changes in Capital, (v) Consolidated Statements of Cash Flows, and (vi) Notes to Consolidated Financial Statements ​ ​ ​ 104 ​ Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101) ​ ​ ​ 58 Table of Contents 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. ​ ​ SENECA BANCORP, INC. ​ ​ ​ Date: November 14, 2025 ​ /s/ Joseph G. Vitale ​ ​ Joseph G. Vitale ​ ​ President and Chief Executive Officer ​ ​ (Duly Authorized Representative and Principal Executive Officer) ​ ​ ​ Date: November 14, 2025 ​ /s/ Vincent J. Fazio ​ ​ Vincent J. Fazio ​ ​ Executive Vice President and Chief Financial Officer ​ ​ (Principal Financial and Accounting Officer) ​ ​ ​ 59