Exhibit 5.1

March 12, 2025

Marvell Technology, Inc.

1000 N. West Street, Suite 1200

Wilmington, Delaware 19801

Ladies and Gentlemen:

At your request, we have examined the Registration Statement on Form S 3 (the “Registration Statement”), filed by Marvell Technology, Inc., a Delaware corporation (the “Company”), with the Securities and Exchange Commission (the “Commission”) in connection with the registration pursuant to the Securities Act of 1933, as amended (the “Act”), and the prospectus supplement, dated March 12, 2025, filed with the Commission on March 12, 2025 pursuant to Rule 424(b) of the Act (the “Prospectus Supplement”) in connection with the offering of up to 4,180,683 shares of the Company’s common stock, par value $0.002 per share (the “Shares”), pursuant to a warrant by and between the Company and Amazon.com NV Investment Holdings LLC dated as of December 2, 2024 (the “Warrant”).

We have examined instruments, documents, certificates and records that we have deemed relevant and necessary for the basis of our opinions hereinafter expressed. In such examination, we have assumed: (a) the authenticity of original documents and the genuineness of all signatures; (b) the conformity to the originals of all documents submitted to us as copies; (c) the truth, accuracy and completeness of the information, representations and warranties contained in the instruments, documents, certificates and records we have reviewed and (d) the legal capacity of all natural persons. As to any facts material to the opinions expressed herein that were not independently established or verified, we have relied upon oral or written statements and representations of officers and other representatives of the Company.

Based on such examination and subject to the foregoing, we are of the opinion that the Shares have been duly authorized by the Company, and when issued and delivered by the Company against payment therefor in accordance with the terms of the Warrant, will be validly issued, fully paid and non-assessable.

Our opinion that any document is legal, valid and binding is qualified as to:

(a) limitations imposed by bankruptcy, insolvency, reorganization, arrangement, fraudulent transfer, moratorium or other similar laws relating to or affecting the rights of creditors generally;

(b) rights to indemnification and contribution which may be limited by applicable law or equitable principles; and

(c) the effect of general principles of equity, including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing, the effect of judicial discretion and the possible unavailability of specific performance, injunctive relief or other equitable relief and the limitations on rights of acceleration, whether considered in a proceeding in equity or at law.

AUSTIN BEIJING BOSTON BOULDER BRUSSELS HONG KONG LONDON LOS ANGELES NEW YORK PALO ALTO

SALT LAKE CITY SAN DIEGO SAN FRANCISCO SEATTLE SHANGHAI WASHINGTON, DC WILMINGTON, DE We express no opinion as to the laws of any other jurisdiction, other than the federal laws of the United States of America and the General Corporation Law of the State of Delaware.

Marvell Technology, Inc.

March 12, 2025

Page 2

We hereby consent to the filing of this opinion as an exhibit to the above referenced Registration Statement and to the use of our name wherever it appears in the Registration Statement, the Prospectus, any Prospectus Supplement, and in any amendment or supplement thereto. 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 Act or the rules and regulations of the Commission thereunder.