X0607 3 2026-08-12 0 0001285819 OMEROS CORP OMER 0001362618 Schocken Joseph L false 201 ELLIOTT AVENUE WEST SEATTLE WA 98119 1 Common Stock 380472 D Common Stock 145100 I Tranceka, LLC Common Stock 2510 I Tranceka Holdings, LLC Tranceka, LLC is wholly owned by the reporting person and his spouse, and the reporting person is the sole manager. Tranceka Holdings, LLC is wholly owned by Tranceka, LLC. /s/ Peter B. Cancelmo, Attorney-in-Fact 2026-08-18