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Exhibit 5.1
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ROPES & GRAY LLP
PRUDENTIAL TOWER
800 BOYLSTON STREET
BOSTON, MA 02199-3600
WWW.ROPESGRAY.COM

November 3, 2025
CAMP4 Therapeutics Corporation
One Kendall Square, Building 1400 West, 3rd Floor
Waltham, MA 02139
Re: Registration of Securities by CAMP4 Therapeutics Corporation
Ladies and Gentlemen:
We have acted as counsel to CAMP4 Therapeutics Corporation, a Delaware corporation (the “Company”), in connection with the registration statement on Form S-3 (the “Registration Statement”) filed on the date hereof by the Company with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), relating to the registration under the Securities Act and the proposed offer and sale from time to time pursuant to Rule 415 under the Securities Act, by certain stockholders of the Company identified in the Registration Statement, of up to (A)(i) 26,717,414 shares of common stock, $0.0001 par value per share, of the Company (the “Common Stock”) and (ii) 6,003,758 shares of Common Stock issuable upon the exercise of pre-funded warrants, with an exercise price of $0.0001 per share (the “Pre-Funded Warrants” and together with the Common Stock, the “Resale Shares”), which were sold pursuant to that certain Stock Purchase Agreement among the Company and the purchasers named therein, and (B) 6,713,717 shares of Common Stock (the “Piggyback Common Stock” and together with the Resale Shares, the “Securities”) pursuant to the exercise of piggyback registration rights under the Third Amended and Restated Investors’ Rights Agreement by and among the Company and the investors named therein.

In connection with this opinion letter, we have examined such certificates, documents and records and have made such investigation of fact and such examination of law as we have deemed appropriate in order to enable us to render the opinions set forth herein. In conducting such investigation, we have relied, without independent verification, upon certificates of officers of the Company, public officials and other appropriate persons.
The opinions expressed below are limited to the Delaware General Corporation Law.
Based upon and subject to the foregoing and the assumptions, qualifications and limitations set forth below, we are of the opinion that the Securities have been duly authorized by the Company and are validly issued, fully paid and non-assessable.
In rendering the opinions set forth above, we have assumed that (i) the Registration Statement and any amendments thereto will have become effective under the Securities Act, and no stop order suspending the Registration Statement’s effectiveness will have been issued and remain in effect each time the Securities are offered and sold as contemplated by the Registration Statement, and (ii) all Securities will be offered and sold in compliance with applicable federal


CAMP4 Therapeutics Corporation
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and state securities laws and in the manner stated in the Registration Statement and the applicable prospectus supplement.
We hereby consent to the filing of this opinion letter as an exhibit to the Registration Statement and to the use of our name therein and in the related prospectus under the caption “Legal Matters.” In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder.
Very truly yours,
/s/ Ropes & Gray LLP
Ropes & Gray LLP
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