OMEROS CORP 10-Q

ITEM 5. OTHER INFORMATION (a) None . (b) None . (c) During the three months ended March 31, 2025, none of our directors or Section 16 reporting officers adopted or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any “non-Rule 10b5-1 trading arrangement” (as defined in Item 408(c) of Regulation S-K). 26 Table of Contents ITEM 6. EXHIBITS Exhibit Number ​ Description ​ ​ ​ 31.1 ​ Certification of Principal Executive Officer Pursuant to Rule 13-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934 as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 31.2 ​ Certification of Principal Financial Officer Pursuant to Rule 13-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934 as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 32.1 ​ Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 32.2 ​ Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 101.INS ​ Inline XBRL Instance Document 101.SCH ​ Inline XBRL Taxonomy Extension Schema Document 101.CAL ​ Inline XBRL Taxonomy Extension Calculation Link base Document 101.DEF ​ Inline XBRL Taxonomy Extension Definition Linkbase Document 101.LAB ​ Inline XBRL Taxonomy Extension Label Linkbase Document 101.PRE ​ Inline XBRL Taxonomy Extension Presentation Linkbase Document 104.1 ​ Cover Page Interactive Data File, formatted in Inline XBRL (included in Exhibit 101) The certifications attached as Exhibits 32.1 and 32.2 that accompany this Quarterly Report on Form 10-Q are not deemed filed with the SEC and are not to be incorporated by reference into any filing of Omeros Corporation under the Securities Act or the Exchange Act, whether made before or after the date of this Quarterly Report on Form 10-Q, irrespective of any general incorporation language contained in such filing. ​ 27 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. ​ OMEROS CORPORATION ​ ​ Dated: May 15, 2025 /s/ Gregory A. Demopulos ​ Gregory A. Demopulos, M.D. ​ President, Chief Executive Officer and Chairman of the Board of Directors ​ ​ Dated: May 15, 2025 /s/ David J. Borges ​ David J. Borges ​ Vice President, Finance, Chief Accounting Officer and Treasurer ​ 28