Material Event (Form 8-K)

Item 8.01 Other Events.

On June 17, 2026, Omeros Corporation (the "Company") entered into privately negotiated agreements with certain holders of its 9.50% Convertible Senior Notes due 2029 (the "Notes") under which it agreed to repurchase Notes having an aggregate principal amount of up to approximately $16.0 million for a total purchase price, inclusive of accrued and unpaid interest and all other obligations, of up to approximately $34.0 million, subject in each case to adjustment based on the trading price of the Company's common stock during an averaging period beginning on June 18, 2026, and customary closing conditions. The Company expects the repurchases to close between July 6, 2026 and July 16, 2026, following the completion of the averaging period. If the full $16.0 million aggregate principal amount of Notes is repurchased, approximately $54.8 million aggregate principal amount of Notes will remain outstanding following the repurchases.