Omeros Corp., of Seattle, priced an underwritten public offering of 3 million common shares at $22.75 apiece, for expected gross proceeds of $68.25 million, and granted underwriters a 30-day option to purchase up to 450,000 additional shares to fill overallotments, potentially adding $10.2 million to the financing. The bought deal offering is expected to close by Aug. 18, subject to customary conditions.