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Exhibit 5.1 |
Courtney M.W. Tygesson
+1 312 881 6680
ctygesson@cooley.com
November 24, 2023
Harpoon Therapeutics, Inc.
611 Gateway Boulevard, Suite 400
South San Francisco, California
94080
Ladies and Gentlemen:
We have acted as counsel to
Harpoon Therapeutics, Inc., a Delaware corporation (the “Company”), in connection with the offering by the Company of shares of the Company’s common stock, $0.0001 par value per share (the “Common
Stock”), having aggregate sale proceeds of up to $59,086,211 (the “Shares”), pursuant to a Registration Statement on Form S-3 (File
No. 333-271400) (the “Registration Statement”) filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as
amended (the “Securities Act”), the prospectus included in the Registration Statement (the “Base Prospectus”) and the amendment to the prospectus relating to the Shares dated November 24, 2023, to
be filed with the Commission pursuant to Rule 424(b) under the Act (together with the Base Prospectus, the “Prospectus”). The Shares are to be sold by the Company in accordance with that certain Controlled Equity OfferingSM Sales Agreement, dated March 13, 2020, by and between the Company and Cantor Fitzgerald & Co. (the “Agreement”), as described in the Prospectus.
In connection with this opinion, we have examined and relied upon the Registration Statement and the Prospectus, the Company’s certificate of
incorporation and bylaws, each as currently in effect, the Agreement and such other records, documents, certificates, memoranda and other instruments as in our judgment are necessary or appropriate to enable us to render the opinion expressed below.
We have assumed the genuineness of all signatures; the authenticity of all documents submitted to us as originals; the conformity to originals of all documents submitted to us as copies; the accuracy, completeness and authenticity of certificates of
public officials; and the due authorization, execution and delivery of all documents by all persons other than the Company where authorization, execution and delivery are prerequisites to the effectiveness thereof. As to certain factual matters, we
have relied upon a certificate of an officer of the Company and have not independently verified such matters.
We have assumed (i) that each sale of
Shares will be duly authorized by the Board of Directors of the Company, a duly authorized committee thereof or a person or body pursuant to an authorization granted in accordance with Section 152 of the General Corporation Law of the State of
Delaware (the “DGCL”), (ii) that no more than 10,000,000 Shares will be sold pursuant to the Agreement and (iii) that the price at which the Shares are sold will equal or exceed the par value of the Common Stock. We
express no opinion to the extent that future issuances of securities of the Company, anti-dilution adjustments to outstanding securities of the Company or other matters cause the number of shares of Common Stock issuable under the Agreement to
exceed the number of shares of Common Stock available for issuance by the Company.
Our opinion herein is expressed solely with respect to the DGCL. We
express no opinion to the extent that any other laws are applicable to the subject matter hereof and express no opinion and provide no assurance as to compliance with any federal or state securities law, rule or regulation.
On the basis of the foregoing, and in reliance thereon, and subject to the qualifications herein stated, we are of the opinion that the Shares, when issued
against payment therefor in accordance with the Agreement, the Registration Statement and the Prospectus, will be validly issued, fully paid and nonassessable.
COOLEY LLP 110 NORTH WACKER, SUITE 4200, CHICAGO, ILLINOIS 60606
T: (312) 881-6500 F: (312) 881-6598 COOLEY.COM