Exhibit 5.1
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 | | Covington & Burling LLP |
| One CityCenter |
BEIJING BRUSSELS DUBAI FRANKFURT JOHANNESBURG | | 850 Tenth Street, NW |
LONDON LOS ANGELES NEW YORK PALO ALTO | | Washington, DC 20001-4956 |
SAN FRANCISCO SEOUL SHANGHAI WASHINGTON | | T +1 202 662 6000 |
March 1, 2019
Omeros Corporation
The Omeros Building
201 Elliott Avenue West
Seattle, Washington 98119
Ladies and Gentlemen:
We have acted as special counsel to Omeros Corporation, a Washington corporation (the “Company”), in connection with the registration by the Company under the Securities Act of 1933, as amended (the “Securities Act”), of the offer and sale from time to time of up to $100,000,000 in aggregate amount of (i) shares of the Company’s common stock, par value $0.01 per share (the “Common Stock”), (ii) shares of the Company’s preferred stock, par value $0.01 per share (the “Preferred Stock”), (iii) debt securities, which may be either senior or subordinated and may be issued in one or more series (the “Debt Securities”), (iv) depositary shares, representing a fractional interest in a share of Preferred Stock and evidenced by a depositary receipt (the “Depositary Shares”), (v) warrants to purchase Common Stock, Preferred Stock or Debt Securities (the “Warrants”), (vi) rights to subscribe for and to purchase Common Stock or Preferred Stock (the “Subscription Rights”) and (vii) units comprised of any combination of Common Stock, Preferred Stock, Debt Securities, Depositary Shares, Warrants or Subscription Rights (“Units” and, collectively with Debt Securities, Depositary Shares, Warrants and Subscription Rights, the “Covered Securities”), pursuant to the Company’s Registration Statement on Form S-3, File No. 333-219959 (the “Initial Registration Statement”) filed with the Securities and Exchange Commission (the “Commission”) on August 14, 2017, and Post-Effective Amendment No. 1 thereto (“Amendment No. 1”) filed with the Commission on the date hereof. The Initial Registration Statement, as amended by Amendment No. 1, is referred to herein as the “Registration Statement.”
We have reviewed such corporate records, certificates and other documents, and such questions of law, as we have considered necessary or appropriate for the purposes of this opinion. We have assumed that all signatures are genuine, that all documents submitted to us as originals are authentic and that all copies of documents submitted to us conform to the originals.
We have assumed that, at the time of the issuance, sale and delivery of each series of Debt Securities and each issue of Depositary Shares, Warrants, Subscription Rights or Units, as the case may be: (i) the execution, delivery and performance by the Company of the senior indenture in the form of Exhibit 4.2 to the Registration Statement or the subordinated indenture in the form of Exhibit 4.3 to the Registration Statement, as applicable, and any supplemental indenture thereto (any such indenture, together with any applicable supplemental indenture, the “Indenture”), deposit agreement, warrant agreement, subscription agreement or subscription