December 25, 2025 — Omeros Corporation (NASDAQ: OMER) is having the kind of week biotech investors daydream about: a long-awaited U.S. regulatory win, a sharp stock re-rating, and a sudden pivot from “development-stage hope” to “commercial-stage execution.” The spark was the U.S. FDA approval of YARTEMLEA® (narsoplimab-wuug) as the first and only therapy indicated for hematopoietic stem cell transplant–associated thrombotic microangiopathy (TA‑TMA)—a dangerous complication that can follow stem cell transplantation. Omeros says it is finalizing preparations for a U.S. launch in January 2026, with reimbursement infrastructure already in motion. Omeros Corporation With the FDA decision now public, OMER stock pushed