UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 24, 2018

MARVELL TECHNOLOGY GROUP LTD.

(Exact name of registrant as specified in its charter)

Canon’s Court

22 Victoria Street

Hamilton HM 12

Bermuda

(Address of principal executive offices)

(441) 296-6395

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

On May 24, 2018, Marvell Technology Group Ltd. (the “Company”) issued a press release announcing that it has received written communication from the Committee on Foreign Investment in the United States (“CFIUS”) that CFIUS has completed its review of the Company’s previously announced merger transaction with Cavium, Inc. (the “Merger”) and determined that there are no unresolved national security concerns with respect to the Merger. The Merger remains subject to customary closing conditions, including receipt of regulatory approval from China’s MOFCOM Anti-Monopoly Bureau which has been transferred into China’s State Administration for Market Regulation. Marvell continues to expect the Merger to close mid-calendar year of 2018.

A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

Cautionary Statement Regarding Forward-Looking Statements

This document contains certain forward-looking statements within the meaning of the federal securities laws with respect to the proposed transaction between Cavium and Marvell, including statements regarding the benefits of the transaction, the anticipated timing of the transaction and the products and markets of each company. These forward-looking statements generally are identified by the words “believe,” “project,” “expect,” “anticipate,” “estimate,” “intend,” “strategy,” “future,” “opportunity,” “plan,” “may,” “should,” “will,” “would,” “will be,” “will continue,” “will likely result,” and similar expressions. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to risks and uncertainties. Many factors could cause actual future events to differ materially from the forward-looking statements in this document, including but not limited to: (i) uncertainties as to the timing of the consummation of the transaction and the ability of each party to consummate the transaction, (ii) the failure to satisfy the conditions to the consummation of the transaction, (iii) the failure to realize the anticipated benefits of the proposed transaction, including as a result of delay in completing the transaction or integrating the businesses of Cavium and Marvell, (iv) the effect of the announcement or pendency of the transaction on Cavium’s business relationships, operating results, and business generally, (v) risks that the proposed transaction disrupts current plans and operations of Cavium or Marvell and potential difficulties in Cavium employee retention as a result of the transaction, (vi) the outcome of litigation and other legal proceedings against Cavium and/or Marvell or to which Cavium and/or Marvell become subject, and (vii) the ability of Marvell to successfully integrate Cavium’s operations and product lines. The foregoing review of important factors should not be construed as exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties that affect the businesses of Marvell and Cavium described in the “Risk Factors” section of their respective Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and other documents filed by either of them from time to time with the SEC. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and Marvell and Cavium assume no obligation and do not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise. Neither Marvell nor Cavium gives any assurance that either Marvell or Cavium will achieve its expectations.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: May 24, 2018