X0202 SCHEDULE 13G/A 0001041885 XXXXXXXX LIVE 14 COMMON STOCK 12/31/2025 0001285819 OMEROS CORP 682143102 201 ELLIOTT AVENUE WEST SEATTLE WA 98119 Rule 13d-1(b) INGALLS & SNYDER LLC NY 0.00 0.00 0.00 3466268.00 3466268.00 4.8 BD IA OMEROS CORP 201 ELLIOTT AVENUE WEST, SEATTLE, WASHINGTON, 98119 INGALLS & SNYDER, LLC 1 ROCKEFELLER PLAZA, NEW YORK, NY 10020 NEW YORK N BD IA 3466268 4.8 0 0 0 3466268 Y N Ingalls & Snyder, LLC ("I&S") is a registered broker dealer and a registered investment advisor. Shares reported under shared dispositive power include shares held in accounts managed under investment advisory contracts. Share count assumes conversion of $550,000 Omeros 5.25% due 2/15/26. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. INGALLS & SNYDER LLC THOMAS O BOUCHER JR 04/23/2026