Filed pusuant to Rule 424(b)(3)
Registration No. 333-222235

PROPOSED MERGER AND SHARE ISSUANCE—YOUR VOTE IS VERY IMPORTANT

Dear Shareholders:

Marvell Technology Group Ltd. (“Marvell”), Kauai Acquisition Corp., an indirect wholly owned subsidiary of Marvell (“Merger Sub”), and Cavium, Inc. (“Cavium”) have entered into an agreement and plan of merger, dated as of November 19, 2017 (the “Merger Agreement”). Merger Sub is a direct wholly owned subsidiary of Marvell Technology, Inc. (“MTI”), which is a direct wholly owned subsidiary of Marvell. Pursuant to the Merger Agreement, Merger Sub will merge with and into Cavium (the “Merger”), with Cavium continuing as the surviving corporation in the Merger and as a direct wholly owned subsidiary of MTI. Upon completion of the Merger, each issued and outstanding share of common stock, par value $0.001 per share, of Cavium, other than any shares owned by Cavium, Marvell, Merger Sub or any of their respective subsidiaries, will be converted into the right to receive 2.1757 Marvell common shares, par value $0.002 per share, and $40.00 in cash.

Immediately following the Merger, Marvell’s shareholders will own approximately 76.7% of Marvell’s issued common shares, and Cavium’s shareholders will own approximately 23.3% of Marvell’s issued common shares, based on the number of Marvell common shares issued and the number of shares of Cavium common stock outstanding as of January 22, 2018. Marvell common shares are listed on the NASDAQ Global Select Market (“NASDAQ”) under the symbol “MRVL.” Cavium common stock is listed on NASDAQ under the symbol “CAVM.” Upon completion of the Merger, Cavium common stock will be delisted from NASDAQ.

The Merger will be a taxable transaction for U.S. federal income tax purposes.

We are each holding a meeting of shareholders in order to obtain the shareholder approvals necessary to complete the Merger. At Cavium’s shareholder meeting, Cavium will ask its shareholders to adopt the Merger Agreement, and at Marvell’s shareholder meeting, Marvell will ask its shareholders to approve the issuance of Marvell common shares in connection with the Merger (the “Marvell Share Issuance”). Adoption of the Merger Agreement by Cavium shareholders is a condition to the completion of the Merger. Approval of the Marvell Share Issuance by Marvell shareholders is a condition to the completion of the Merger. The obligations of Marvell, Merger Sub and Cavium to complete the Merger are also subject to the satisfaction or waiver of several other conditions set forth in the Merger Agreement and described in this joint proxy statement/prospectus. We urge you to read this joint proxy statement/prospectus, and the documents incorporated by reference into this joint proxy statement/prospectus, carefully and in their entirety. In particular, we urge you to read carefully the section entitled “Risk Factors” beginning on page 25.

After careful consideration, the board of directors of Marvell has determined that the Merger and the Marvell Share Issuance are fair to, and in the best interests of, Marvell and its shareholders; and the board of directors of Cavium has determined that the Merger Agreement and the Merger are fair to, and in the best interests of, Cavium and its shareholders. Accordingly, the Marvell board of directors unanimously recommends that the Marvell shareholders vote “FOR” the approval of the Marvell Share Issuance and the other proposal to be considered at the Marvell general meeting, and the Cavium board of directors unanimously recommends that the Cavium shareholders vote “FOR” the adoption of the Merger Agreement and the other proposals to be considered at the Cavium special meeting.

We are very excited about the opportunities the proposed Merger brings to both Marvell shareholders and Cavium shareholders, and we thank you for your consideration and continued support.

              Sincerely,

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities to be issued under this joint proxy statement/prospectus or passed upon the adequacy or accuracy of this joint proxy statement/prospectus. Any representation to the contrary is a criminal offense.

This joint proxy statement/prospectus is dated February 5, 2018, and is first being mailed to Marvell shareholders and Cavium shareholders on or about February 7, 2018.

REFERENCES TO ADDITIONAL INFORMATION

As used in this joint proxy statement/prospectus, “Marvell” refers to Marvell Technology Group Ltd., “Merger Sub” refers to Kauai Acquisition Corp., and “Cavium” refers to Cavium, Inc. “We” or “our” refers to Marvell and Cavium. This joint proxy statement/prospectus incorporates important business and financial information about Marvell and Cavium from documents that each company has filed with the Securities and Exchange Commission (the “SEC”), but which have not been included in or delivered with this joint proxy statement/prospectus. For a list of documents incorporated by reference into this joint proxy statement/prospectus and how you may obtain them, see “Where You Can Find More Information” beginning on page 236. This information is available to you without charge upon your written or oral request. You can also obtain the documents incorporated by reference into this joint proxy statement/prospectus by accessing the SEC’s website maintained at http://www.sec.gov.

In addition, Marvell’s filings with the SEC are available to the public on Marvell’s website, http://www.marvell.com, and Cavium’s filings with the SEC are available to the public on Cavium’s website, http://www.cavium.com. Information about the Merger and the other transactions contemplated by the Merger Agreement is also contained on the following transaction website: http://marvellcavium.transactionannouncement.com. Information contained on Marvell’s website, Cavium’s website, the transaction website or the website of any other person is not incorporated by reference into this joint proxy statement/prospectus, and you should not consider information contained on those websites as part of this joint proxy statement/prospectus.

Marvell or its proxy solicitor will provide you with copies of the information described above that relate to Marvell, without charge, if you request them in writing or by telephone from:

Marvell Technology Group Ltd.

c/o Marvell Semiconductor, Inc.

5488 Marvell Lane

Santa Clara, California 95054

Attention: Investor Relations

(408) 222-0777

[email protected]

Innisfree M&A Incorporated

501 Madison Avenue, 20th Floor

New York, NY 10022

Shareholders may call toll free: (888) 750-5834

Banks and Brokers may call collect: (212) 750-5833

Cavium or its proxy solicitor will provide you with copies of the information described above that relate to Cavium, without charge, if you request such information in writing or by telephone from:

Cavium, Inc.

2315 N. First Street

San Jose, California 95131

Attention: Investor Relations

(408) 943-7100

[email protected]

or

MacKenzie Partners, Inc.

105 Madison Avenue

New York, New York 10016

Shareholders may call toll free: (800) 322-2885

Banks and Brokers may call collect: (212) 929-5500

[email protected]

If you would like to request documents, please do so by February 20, 2018, in order to receive them before the shareholder meetings.

This joint proxy statement/prospectus, which forms part of a registration statement on Form S-4 (File No.333-222235) filed with the SEC by Marvell, constitutes a prospectus of Marvell under Section 5 of the Securities Act of 1933, as amended (the “Securities Act”), with respect to Marvell common shares to be issued to Cavium shareholders in connection with the Merger. This joint proxy statement/prospectus also constitutes a joint proxy statement under Section 14(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). It also constitutes a notice of meeting with respect to the general meeting of Marvell shareholders and a notice of meeting with respect to the special meeting of Cavium shareholders.

You should rely only on the information contained in or incorporated by reference into this joint proxy statement/prospectus. No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this joint proxy statement/prospectus. This joint proxy statement/prospectus is dated February 5, 2018. You should not assume that the information contained in, or incorporated by reference into, this joint proxy statement/prospectus is accurate as of any date other than that date. Neither our mailing of this joint proxy statement/prospectus to Marvell shareholders or Cavium shareholders, nor the issuance by Marvell of common shares in connection with the Merger, will create any implication to the contrary.

This joint proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction to or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction. Information contained in this joint proxy statement/prospectus regarding Marvell has been provided by Marvell, and information contained in this joint proxy statement/prospectus regarding Cavium has been provided by Cavium.

NOTICE OF GENERAL MEETING OF MARVELL SHAREHOLDERS

TO BE HELD ON MARCH 16, 2018

MARVELL TECHNOLOGY GROUP LTD.

Canon’s Court

22 Victoria Street

Hamilton HM 12

Bermuda

Dear Shareholders of Marvell Technology Group Ltd.:

You are cordially invited to a general meeting of shareholders of Marvell Technology Group Ltd. (“Marvell”) at the offices of Marvell Semiconductor, Inc. located at 5488 Marvell Lane, Santa Clara, California 95054, at 1:00 p.m. local time on March 16, 2018. Only shareholders who hold Marvell common shares at the close of business on February 2, 2018, the record date for the general meeting, are entitled to vote at the general meeting and any adjournments or postponements of the general meeting.

At the general meeting, you will be asked to consider and vote upon and approve the following proposals:

No other business will be conducted at the general meeting. This joint proxy statement/prospectus describes the proposals listed above in detail. Please give your careful attention to all of the information contained in or incorporated by reference into this joint proxy statement/prospectus, including the Merger Agreement and the other Annexes, for further information. This joint proxy statement/prospectus is also available on Marvell’s Internet site at http://investor.marvell.com. This joint proxy statement/prospectus contains detailed information about the general meeting, Marvell, Cavium and the Merger. We urge you to read this joint proxy statement/prospectus carefully and in its entirety. In particular, see the section entitled “Risk Factors” beginning on page 25 of this joint proxy statement/prospectus for a discussion of the risks related to the Merger. For specific instructions on how to submit your proxy, please refer to the section of this joint proxy statement/prospectus entitled “The Marvell General Meeting” beginning on page 50.

After careful consideration, the Marvell board of directors has unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger and the Marvell Share Issuance, and has determined that the Merger and the Marvell Share Issuance are fair to, and in the best interests of, Marvell and Marvell’s shareholders. The Marvell board of directors accordingly unanimously recommends that you vote “FOR” the approval of the Marvell Share Issuance and “FOR” the Marvell Adjournment Proposal.

YOUR VOTE IS VERY IMPORTANT REGARDLESS OF THE NUMBER OF SHARES YOU OWN.

The Merger cannot be completed without the approval of the Marvell Share Issuance by the affirmative vote of a majority of the Marvell common shares represented in person or by proxy at the Marvell general meeting at which a quorum is present, which, under legal principles understood by Marvell’s Bermuda counsel to be applicable in Bermuda, excludes abstentions and broker non-votes, if any, which will have no effect on the outcome of the vote on this proposal. Marvell shareholders as of February 2, 2018 may have their Marvell common shares voted by following the instructions provided in this joint proxy statement/prospectus or on the enclosed proxy card or, if your shares are held in “street name,” by following the instructions in the voting instruction form to be provided to you by your bank, broker or other nominee. Marvell strongly recommends that Marvell shareholders entitled to vote submit a proxy even if they plan to attend the Marvell general meeting. Submitting a proxy now (including by telephone or over the Internet) will not prevent you from being able to vote at the Marvell general meeting by attending in person and casting a vote. Abstentions and broker non-votes, if any, will have no effect on the outcome of the vote on the Marvell Share Issuance.

Marvell shareholders who hold their Marvell common shares beneficially in “street name” and wish to submit a proxy must provide instructions to the broker, bank, trustee or other nominee that holds their Marvell common shares as to how to vote their Marvell common shares. A Marvell shareholder who holds his or her Marvell common shares beneficially in “street name” and wishes to vote in person at the Marvell general meeting must obtain a proxy issued in the holder’s own name (known as a “legal proxy”) from the holder’s broker, bank or trustee.

By Order of the Board of Directors,

Mitchell L. Gaynor

Chief Administration and Legal Officer and Secretary

Santa Clara, California

February 5, 2018

Please submit your proxy promptly. You can find instructions for voting on the enclosed proxy card.

If you have any questions concerning the Merger Agreement, the Merger or the other transactions contemplated by the Merger Agreement, or this joint proxy statement/prospectus, would like additional copies or need help voting your Marvell common shares, please contact Marvell or Marvell’s proxy solicitor:

Marvell Technology Group Ltd.

c/o Marvell Semiconductor, Inc.

5488 Marvell Lane

Santa Clara, California 95054

Attention: Investor Relations

(408) 222-0777

[email protected]

Innisfree M&A Incorporated

501 Madison Avenue, 20th Floor

New York, NY 10022

Shareholders may call toll free: (888) 750-5834

Banks and Brokers may call collect: (212) 750-5833

YOUR VOTE IS VERY IMPORTANT.

CAVIUM, INC.

2315 N. First Street

San Jose, California 95131

NOTICE OF SPECIAL MEETING OF CAVIUM SHAREHOLDERS

To Be Held on March 16, 2018

Dear Shareholders of Cavium, Inc.:

NOTICE IS HEREBY GIVEN that a special meeting of shareholders of Cavium, Inc., a Delaware corporation (“Cavium”), will be held at Cavium’s corporate headquarters, 2315 N. First Street, San Jose, California 95131, at 10:00 a.m. local time, on March 16, 2018. Only shareholders who hold shares of Cavium common stock at the close of business on February 2, 2018, the record date for the special meeting, are entitled to vote at the special meeting and any adjournments or postponements of the special meeting.

At the special meeting, you will be asked to consider and vote upon and approve the following proposals, as more fully described in this joint proxy statement/prospectus:

No other business will be conducted at the special meeting. This joint proxy statement/prospectus describes the proposals listed above in more detail. Please give your careful attention to all of the information contained in or incorporated by reference into this joint proxy statement/prospectus, including the Merger Agreement and the other Annexes, for further information. This joint proxy statement/prospectus is also available on Cavium’s Internet site at http://investor.caviumnetworks.com. This joint proxy statement/prospectus contains detailed information about the special meeting, Marvell, Cavium and the Merger. You are encouraged to read the entire joint proxy statement/prospectus carefully before submitting your proxy. In particular, see the section entitled “Risk Factors” beginning on page 25. For specific instructions on how to submit your proxies, please refer to the section of this joint proxy statement/prospectus entitled “The Cavium Special Meeting” beginning on page 57.

After careful consideration, the Cavium board of directors has unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger, and determined that the Merger Agreement and the transactions contemplated by the Merger Agreement, including the Merger, are advisable, fair to and in the best interests of Cavium and its shareholders and unanimously recommends that you vote “FOR” the Merger Proposal; “FOR” the Cavium Adjournment Proposal; and “FOR” the Cavium Non-Binding Compensation Proposal.

YOUR VOTE IS VERY IMPORTANT REGARDLESS OF THE NUMBER OF SHARES YOU OWN.

The Merger cannot be completed without the adoption of the Merger Agreement by the affirmative vote of a majority of the outstanding shares of Cavium common stock. Cavium shareholders as of February 2, 2018 may have their Cavium common stock voted by following the instructions provided in this joint proxy statement/prospectus or on the enclosed proxy card or, if your shares are held in “street name,” by following the instructions in the voting instruction form to be provided to you by your bank, broker or other nominee. Cavium strongly recommends that Cavium shareholders entitled to vote submit a proxy even if they plan to attend the Cavium special meeting. Submitting a proxy now (including by telephone or over the Internet) will not prevent you from being able to vote at the Cavium special meeting by attending in person and casting a vote. However, if you do not return or submit your proxy (including by telephone or over the Internet) or vote in person at the Cavium special meeting, it will have the same effect as a vote “AGAINST” the approval of the Merger Proposal. If you attend the Cavium special meeting in person or by proxy, and you abstain from voting, that will have the same effect as a vote “AGAINST” approval of the Merger Proposal.

Cavium shareholders who hold their Cavium common stock beneficially in “street name” and wish to submit a proxy must provide instructions to the broker, bank, trustee or other nominee that holds their Cavium common stock as to how to vote their Cavium common stock. A Cavium shareholder who holds his or her Cavium common stock beneficially in “street name” and wishes to vote in person at the Cavium special meeting must obtain a proxy issued in the holder’s own name (known as a “legal proxy”) from the holder’s broker, bank or trustee.

By Order of the Board of Directors,

Syed B. Ali

Chairman of the Board of Directors

San Jose, California

February 5, 2018

Please submit your proxy promptly. You can find instructions for voting on the enclosed proxy card.

If you have any questions concerning the Merger Agreement, the Merger or the other transactions contemplated by the Merger Agreement, or this joint proxy statement/prospectus, would like additional copies or need help voting your shares of Cavium common stock, please contact Cavium or Cavium’s proxy solicitor:

Cavium, Inc.

2315 N. First Street

San Jose, California 95131

Attention: Investor Relations

(408) 943-7100

[email protected]

or

MacKenzie Partners, Inc.

105 Madison Avenue

New York, New York 10016

Shareholders may call toll free: (800) 322-2885

Banks and Brokers may call collect: (212) 929-5500

[email protected]

YOUR VOTE IS VERY IMPORTANT.

TABLE OF CONTENTS

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QUESTIONS AND ANSWERS ABOUT THE MERGER

AND SHAREHOLDER MEETINGS OF MARVELL AND CAVIUM

The following questions and answers briefly address some questions that you may have about the shareholder meetings and the Merger. They may not include all the information that is important to you. Marvell, Merger Sub and Cavium urge you to read carefully this entire joint proxy statement/prospectus, including the Annexes and the other documents to which we have referred you. We have included cross-references in certain parts of this section to direct you to a more detailed description of each topic presented elsewhere in this joint proxy statement/prospectus.

The enclosed proxy materials allow you to grant a proxy to vote your shares by completing the enclosed proxy card or by submitting your proxy by telephone or over the Internet without attending your company’s shareholder meeting in person.

Your vote is important. We encourage you to submit your proxy as soon as possible.

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Cavium. The Cavium board of directors has determined that the Merger Agreement and the Merger are fair to, and in the best interests of, Cavium and its shareholders and has unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger. The Cavium board of directors unanimously recommends that the Cavium shareholders vote “FOR” the Merger Proposal, “FOR” the Cavium Adjournment Proposal and “FOR” the Cavium Non-Binding Compensation Proposal at the Cavium special meeting. See “The Merger—Cavium’s Reasons for the Merger and Recommendation of Cavium’s Board of Directors” for more information.

Approval of the Marvell Adjournment Proposal requires the affirmative vote of a majority of the Marvell common shares represented in person or by proxy at the Marvell general meeting, regardless of whether a quorum is present. Under legal principles understood by Marvell’s Bermuda counsel to be applicable in Bermuda, if you are present in person or represented by proxy, attend the meeting in person or by proxy, and vote to abstain, it will have no effect on the outcome of the vote on the Marvell Adjournment Proposal. Also under legal principles understood by Marvell’s Bermuda counsel to be applicable in Bermuda, broker non-votes, if any, and shares not in attendance and not represented by proxy at the Marvell general meeting also will have no effect on the outcome of the Marvell Adjournment Proposal. See “The Marvell General Meeting—Quorum and Vote Required” for more information.

To approve the Cavium Adjournment Proposal, the affirmative vote of a majority of the shares of Cavium common stock present in person or represented by proxy at the Cavium special meeting and entitled to vote

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is required, regardless of whether a quorum is present. Abstentions will have the same effect as a vote “AGAINST” the Cavium Adjournment Proposal, while broker non-votes and shares not represented at the Cavium special meeting will have no effect on the outcome of the vote on the Cavium Adjournment Proposal.

To approve the Cavium Non-Binding Compensation Proposal, the affirmative vote of a majority of the shares of Cavium common stock present in person or represented by proxy at the Cavium special meeting and entitled to vote is required, assuming a quorum is present. Abstentions will have the same effect as a vote “AGAINST” the Cavium Non-Binding Compensation Proposal, while broker non-votes and shares not represented at the Cavium special meeting will have no effect on the outcome of the Cavium Non-Binding Compensation Proposal, provided that a quorum is present. See “The Cavium Special Meeting—Quorum and Vote Required” for more information. The Cavium Non-Binding Compensation Proposal is advisory, and therefore not binding on Cavium, Cavium’s compensation committee or the Cavium board of directors. Accordingly, regardless of the outcome of the Cavium Non-Binding Compensation Proposal, if the Merger is completed, Cavium’s named executive officers may be or become entitled to receive the compensation that is based on or otherwise relates to the Merger in accordance with the terms and conditions applicable to those payments. See “The Cavium Special Meeting—Quorum and Vote Required” for more information.

Cavium shareholders are entitled to one vote for each share of Cavium common stock owned by such holders at the close of business on February 2, 2018 (the “Cavium record date”). See “The Cavium Special Meeting—Record Date; Outstanding Shares; Shares Entitled to Vote” for more information.

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Marvell will not issue fractional shares as a result of the Merger; each holder of Cavium common stock that would otherwise be entitled to a fraction of a Marvell common share (after aggregating all fractions of a Marvell common share issuable to such shareholder) will, upon surrender of such holder’s Cavium stock certificate(s) or the transfer of such holder’s non-certificated shares represented by book entry positions, be entitled to receive an amount in cash (rounded to the nearest whole cent), without interest, equal to the product obtained by multiplying such fraction by the closing price of a Marvell common share on NASDAQ on the closing date of the Merger. The Marvell common shares (and cash in lieu of any fraction of a Marvell common share) and the cash consideration that a Cavium shareholder is entitled to receive in exchange for the shares of Cavium common stock held by such holder pursuant to the Merger Agreement is referred to in this joint proxy statement/prospectus as the “Merger Consideration.”

On November 2, 2017, the last trading day prior to the first media report of a possible transaction between Marvell and Cavium, the closing price of Marvell common shares on NASDAQ was $18.28. On January 22, 2018, the last practicable trading day prior to the filing of this joint proxy statement/prospectus, the closing price of Marvell common shares on NASDAQ was $23.62 per share. We urge you to obtain current market quotations before voting your shares.

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If you are a Marvell shareholder:

Innisfree M&A Incorporated

501 Madison Avenue, 20th Floor

New York, NY 10022

Shareholders may call toll free: (888) 750-5834

Banks and Brokers may call collect: (212) 750-5833

If you are a Cavium shareholder:

MacKenzie Partners, Inc.

105 Madison Avenue

New York, New York 10016

Shareholders may call toll free: (800) 322-2885

Banks and Brokers may call collect: (212) 929-5500

[email protected]

The Cavium special meeting will be held at Cavium headquarters located at 2315 North First Street, San Jose, California 95131, at 10:00 a.m., local time on March 16, 2018.

Owners of Cavium common stock are eligible to vote at the Cavium special meeting if they are shareholders of record at the close of business on the Cavium record date. See “The Cavium Special Meeting—Record Date; Outstanding Shares; Shares Entitled to Vote” for more information.

You should be prepared to present a form of personal identification for admittance. In addition, if you are a record holder, your name will be verified against the list of record holders on the record date prior to being admitted to the meeting. If you are not a record holder but hold shares through a broker, bank or other nominee (i.e., in “street name”), you will need to provide proof of beneficial ownership on the record date, such as your most recent account statement prior to the record date, or other similar evidence of ownership. If you do not provide a form of personal identification or comply with the other procedures outlined above upon request, you may not be admitted to the meeting.

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Owners of record (that is, shareholders who hold Marvell common shares in their own name and not through a bank, broker or other nominee) as of the close of business on February 2, 2018, the record date for the Marvell general meeting, may vote in person at the Marvell general meeting or by proxy. This means

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that you may use the enclosed proxy card(s) (or submit your proxy by telephone or over the Internet) to instruct the persons named as proxies how to vote your Marvell common shares. If you properly complete, sign and date your proxy card(s) or submit your voting instructions by telephone or over the Internet, your Marvell common shares will be voted in accordance with your instructions. The named proxies will vote all Marvell common shares at the Marvell general meeting for which proxies have been properly submitted (whether by mail, telephone or over the Internet) and not revoked. Owners of record have three ways to vote by proxy:

If you sign and return your proxy card(s) but do not mark your card(s) to instruct the proxies how to vote your Marvell common shares on each proposal, your Marvell common shares will be voted as recommended by the Marvell board of directors (i.e., “FOR” each proposal presented to the shareholders).

Owners of record (that is, shareholders who hold shares of Cavium common stock in their own name and not through a bank, broker or other nominee), as of the close of business on February 2, 2018, the record date for the Cavium special meeting, may vote in person at the Cavium special meeting or by proxy. This means that you may use the enclosed proxy card(s) (or submit your proxy by telephone or the Internet) to instruct the persons named as proxies how to vote your shares of Cavium common stock. If you properly complete, sign and date your proxy card(s) or submit your voting instructions by telephone or over the Internet, your shares of Cavium common stock will be voted in accordance with your instructions. The named proxies will vote all shares of Cavium common stock at the Cavium special meeting for which proxies have been properly submitted (whether by mail, telephone or over the Internet) and not revoked. Owners of record have three ways to vote by proxy:

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If you sign and return your proxy card(s) but do not mark your card(s) to instruct the proxies how to vote your shares of Cavium common stock on each proposal, your shares of Cavium common stock will be voted as recommended by the Cavium board of directors (i.e., “FOR” each proposal presented to the shareholders).

If you are a “street name” shareholder and submitted voting instructions to your broker, bank or other nominee, please refer to the instructions provided by your broker, bank or other nominee on how to change your vote.

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If you are a Marvell shareholder:

For all proposals, a properly executed proxy marked “abstain” will be counted in determining whether a quorum is present at the Marvell general meeting, but, under legal principles understood by Marvell’s Bermuda counsel to be applicable in Bermuda, will be excluded from, and will have no effect on the outcome of, the vote on the approval of the Marvell Share Issuance or the Marvell Adjournment Proposal.

If you are a Cavium shareholder:

For all proposals, a properly executed proxy marked “abstain” will be counted in determining whether a quorum is present at the Cavium special meeting. With respect to the Merger Proposal, abstentions will have the same effect as a vote “AGAINST” the Merger Proposal. With respect to the Cavium Adjournment Proposal and the Cavium Non-Binding Compensation Proposal, abstentions will have the same effect as votes “AGAINST” such proposals.

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RISK FACTORS

In addition to the other information contained in or incorporated by reference into this joint proxy statement/prospectus, the shareholders of Marvell and Cavium should carefully consider the following risk factors in determining how to vote on the respective proposals of Marvell and Cavium. The risks associated with the business of Marvell can be found in Marvell’s Exchange Act reporting, including Marvell’s Annual Report on Form 10-K for the fiscal year ended January 28, 2017 and its Quarterly Reports on Form 10-Q for the quarterly periods ended April 29, 2017, July 29, 2017 and October 28, 2017, which are incorporated by reference in this joint proxy statement/prospectus. The risks associated with the business of Cavium can be found in Cavium’s Exchange Act reporting, including the Cavium Annual Report on Form 10-K for the fiscal year ended December 31, 2016, and its Quarterly Reports on Form 10-Q for the fiscal quarters ended on March 31, 2017, June 30, 2017 and September 30, 2017, which are incorporated by reference in this joint proxy statement/prospectus. See “Documents Incorporated by Reference” beginning on page 238.

Risk Factors Relating to the Merger

Because the market price of Marvell common shares will fluctuate, the market value of the Marvell common shares to be issued in connection with the Merger will not be known until completion of the Merger.

Upon completion of the Merger, each share of Cavium common stock outstanding immediately prior to the Merger will be converted into the right to receive (a) 2.1757 Marvell common shares and (b) $40.00 in cash, without interest. There will be no adjustment to the Exchange Ratio due to changes in the market price of either shares of Cavium common stock or Marvell common shares and the Merger Agreement does not provide for any price-based termination right. The value of the Marvell common shares to be issued in the Merger could be considerably higher or lower than they were at the time the Exchange Ratio was negotiated, on the date of this joint proxy statement/prospectus or the dates of the shareholder meetings.

Accordingly, on the dates of the shareholder meetings, shareholders of each of Marvell and Cavium will not know or be able to calculate the exact market value of the Marvell common shares that would be issued upon completion of the Merger.

Share price changes may result from numerous factors, including changes in the respective business operations and prospects of Marvell and Cavium, changes in general market and economic conditions, and regulatory considerations. Many of these factors are beyond the control of Marvell or Cavium.

The market price of Marvell common shares after the Merger might be affected by factors different from, or in addition to, those currently affecting the respective market prices of Marvell common shares and Cavium common stock.

The businesses of Marvell and Cavium differ and, accordingly, the results of operations of Marvell and the market price of Marvell common shares after the Merger may be affected by factors different from, or in addition to, those currently affecting the independent results of operations of each of Marvell and Cavium. For a discussion of the businesses of Marvell and Cavium and of factors to consider in connection with those businesses, see the documents incorporated by reference into this joint proxy statement/prospectus and referred to under “Documents Incorporated by Reference.”

Until the completion of the Merger or the termination of the Merger Agreement in accordance with its terms, Marvell and Cavium are each prohibited from entering into certain transactions and taking certain actions that might otherwise be beneficial to Marvell or Cavium and their respective shareholders.

Until the Merger is completed or the Merger Agreement is terminated, the Merger Agreement restricts Marvell and Cavium from taking specified actions without the consent of the other party, and requires Cavium to conduct

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its business and operations in the ordinary course in all material respects and substantially in accordance with past practices. These restrictions may prevent Marvell and Cavium from making appropriate changes to their respective businesses or pursuing attractive business opportunities that may arise prior to the completion of the Merger. See “The Merger Agreement—Interim Operations of Marvell and Cavium” for a description of the restrictive covenants applicable to Marvell and Cavium.

The Merger Agreement limits each of Marvell’s and Cavium’s ability to pursue alternative transactions, and in certain instances requires payment of a termination fee, which could deter a third party from proposing an alternative transaction.

The Merger Agreement contains provisions that, subject to certain exceptions, limit each of Marvell’s and Cavium’s ability to solicit, initiate, encourage or facilitate, or enter into discussions or negotiations with respect to, any inquiries regarding or the making of any proposal or offer that constitutes or could reasonably be expected to lead to an alternative transaction. See “The Merger Agreement—No Solicitation or Discussions by Marvell” and “The Merger Agreement—No Solicitation or Discussions by Cavium” for more information. In addition, under specified circumstances, Marvell or Cavium is required to pay a termination fee of $180 million if the Merger Agreement is terminated. See “The Merger Agreement—Transaction Expenses and Termination Fees” for a more detailed description of these circumstances. It is possible that these or other provisions might discourage a potential competing acquirer that might have an interest in acquiring all or a significant part of Marvell or Cavium from considering or proposing an acquisition or might result in a potential competing acquirer proposing to pay a lower per share price to acquire Marvell or Cavium than it might otherwise have proposed to pay.

The Merger is subject to a number of conditions, some of which are outside of the parties’ control, and if these conditions are not satisfied or waived, the Merger will not be completed.

The Merger Agreement contains a number of conditions that must be satisfied (or waived) prior to completion of the Merger. Those conditions include, among other conditions:

The required satisfaction or waiver of the foregoing conditions could delay the completion of the Merger for a significant period of time or prevent it from occurring at all. Any delay in completing the Merger could cause the

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combined company not to realize some or all of the benefits that the parties expect the combined company to achieve. Further, there can be no assurance that the conditions to the completion of the Merger will be satisfied or waived or that the Merger will be completed.

In addition, if the Merger is not completed by September 19, 2018 (subject to a potential extension to November 19, 2018 under certain circumstances, including in the event receipt of certain required regulatory approvals have not been obtained), either Marvell or Cavium may choose to terminate the Merger Agreement. Marvell or Cavium may also elect to terminate the Merger Agreement in certain other circumstances, or they may mutually decide to terminate the Merger Agreement at any time prior to the Effective Time, before or after obtaining shareholder approval, as applicable. See “The Merger Agreement—Termination of the Merger Agreement” and “The Merger Agreement—Transaction Expenses and Termination Fees” for a more detailed description of these circumstances.

The Merger is subject to the expiration of applicable waiting periods under, and the receipt of approvals, consents or clearances from, certain domestic and foreign regulatory authorities that may impose conditions that could have an adverse effect on Marvell, Cavium or the combined company or prevent completion of the Merger.

The Merger is subject to the expiration of applicable waiting periods and the receipt of approvals, consents and clearances from both the United States and foreign regulatory authorities. In deciding whether to grant the required regulatory approval, consent or clearance, each relevant governmental entity will consider the effect of the Merger on competition within its jurisdiction. The terms and conditions of the approvals, consents and clearances that are granted may impose requirements, limitations or costs or place restrictions on the conduct of the combined company’s business which may adversely affect the financial position and prospects of the combined company and its ability to achieve the cost savings and other synergies projected to result from the Merger.

In addition, neither Marvell nor Cavium can provide assurance that any such conditions, terms, obligations or restrictions will not result in the delay or abandonment of the Merger. For a more detailed description of the regulatory review process, see the sections entitled “The Merger—Regulatory Approvals Required for the Merger,” “The Merger Agreement—Efforts to Complete the Merger” and “The Merger Agreement—Conditions to Completion of the Merger.”

The Merger is subject to the receipt of CFIUS Approval that may impose measures to protect U.S. national security or other conditions that could have an adverse effect on Marvell, Cavium, or the combined company, or, if not obtained, could prevent completion of the Merger.

Marvell’s obligation to complete the Merger is conditioned on obtaining CFIUS Approval. In deciding whether to grant CFIUS Approval, CFIUS will consider the effect of the Merger on U.S. national security. As a condition to granting CFIUS Approval, CFIUS may take measures and impose conditions, certain of which (a) could materially and adversely affect the combined company’s operating results due to the imposition of requirements, limitations or costs or the placement of restrictions on the conduct of the combined company’s business and (b) could adversely affect the financial position and prospects of the combined company and its ability to achieve the cost savings and other synergies projected to result from the Merger. There can be no assurance that CFIUS will not impose conditions, terms, obligations or restrictions, or that such conditions, terms, obligations or restrictions will not have the effect of delaying completion of the Merger or imposing additional material costs on, or materially limiting the revenues of, the combined company following the Merger. For a more detailed description of the regulatory review process, see the sections entitled “The Merger—Regulatory Approvals Required for the Merger” and “The Merger Agreement—Efforts to Complete the Merger,” and “The Merger Agreement—Conditions to Completion of the Merger.”

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Any delay in completing the Merger may significantly reduce the benefits expected to be obtained from the Merger.

In addition to the required regulatory clearances and approvals, the Merger is subject to a number of other conditions that are beyond the control of Marvell and Cavium and that may prevent, delay or otherwise materially adversely affect completion of the Merger. Marvell and Cavium cannot predict whether and when these other conditions will be satisfied. Further, the requirements for obtaining the required regulatory clearances and approvals could delay the completion of the Merger for a significant period of time or prevent it from occurring. Any delay in completing the Merger may significantly reduce the synergies projected to result from the Merger and other benefits that Marvell and Cavium expect to achieve if they complete the Merger within the expected timeframe and integrate their respective businesses. See “The Merger Agreement—Conditions to Completion of the Merger” for more information.

The business relationships of Marvell and Cavium and their respective subsidiaries may be subject to disruption due to uncertainty associated with the Merger, which could have an adverse effect on the results of operations, cash flows and financial position of Marvell, Cavium and, following the completion of the Merger, the combined company.

Parties with which Marvell and Cavium do business may experience uncertainty associated with the Merger, including with respect to current or future business relationships with Marvell, Cavium or the combined company. Marvell’s and Cavium’s relationships may be subject to disruption as customers, suppliers and other persons with whom Marvell and Cavium have a business relationship may delay or defer certain business decisions or might decide to seek to terminate, change or renegotiate their relationships with Marvell or Cavium, as applicable, or consider entering into business relationships with parties other than Marvell, Cavium or the combined company. These disruptions could have an adverse effect on the results of operations, cash flows and financial position of Marvell, Cavium and, following the completion of the Merger, the combined company, including an adverse effect on Marvell’s ability to realize the expected synergies and other benefits of the Merger. The risk, and adverse effect, of any disruption could be exacerbated by a delay in completion of the Merger or termination of the Merger Agreement.

Some of Cavium’s executive officers and directors may have interests in the Merger that are different from, or in addition to, the interests of Cavium shareholders.

When considering the recommendations of the Cavium board of directors with respect to the Merger, Cavium shareholders should be aware that the directors and executive officers of Cavium have interests in the Merger that may be different from, or in addition to, their interests as shareholders and the interests of shareholders of Cavium generally. These interests include, among others, potential payments under employment agreements and change in control severance agreements, rights to acceleration of vesting and exercisability of options, and acceleration of vesting of restricted stock units as a result of the Merger and rights to ongoing indemnification and insurance coverage for acts or omissions occurring prior to the Merger. See “The Merger—Interests of Cavium Directors and Executive Officers in the Merger” for more information.

As a result of these interests, these directors and executive officers of Cavium might be more likely to support and to vote in favor of the proposals described in this joint proxy statement/prospectus than if they did not have these interests. Each of Cavium’s shareholders should consider whether these interests might have influenced these directors and executive officers to support or recommend voting for the proposals related to the Merger. As of the close of business on January 19, 2018, Cavium directors and executive officers were entitled to vote approximately 3.09% of the then-outstanding shares of Cavium common stock. See “The Merger—Share Ownership of Directors and Executive Officers of Cavium” for more information.

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There can be no assurance that Marvell will be able to secure the funds necessary to pay the cash portion of the Merger Consideration and refinance certain of Cavium’s existing indebtedness on acceptable terms, in a timely manner or at all.

Marvell intends to fund the cash portion of the Merger Consideration to be paid to holders of Cavium common stock with a combination of Marvell’s and Cavium’s cash on hand and debt financing. To this end, Marvell has entered into a debt commitment letter containing commitments as of the date of this joint proxy statement/prospectus for a $900 million term loan facility and an $850 million bridge loan facility. However, as of the date of this joint proxy statement/prospectus, neither Marvell nor any of its subsidiaries has entered into definitive agreements for the debt financing (or other financing arrangements in lieu thereof), and the obligation of the lenders to provide the debt financing under the debt commitment letter is subject to a number of customary conditions. There can be no assurance that Marvell will be able to obtain the debt financing pursuant to the debt commitment letter.

In the event that the debt financing contemplated by the debt commitment letter is not available, other financing may not be available on acceptable terms, in a timely manner or at all. If Marvell is unable to obtain debt financing, the Merger may be delayed or not be completed.

Failure to complete the Merger could negatively impact the share price and the future business and financial results of Marvell and Cavium.

If the Merger is not completed for any reason, the ongoing businesses of Marvell and Cavium may be adversely affected and, without realizing any of the benefits of having completed the Merger, Marvell and Cavium would be subject to a number of risks, including the following:

In addition to the above risks, Marvell or Cavium may be required, under certain circumstances in connection with a termination of the Merger Agreement, to pay the other party a termination fee of up to $180 million, which may materially adversely affect the paying party’s financial results. Further, Marvell and Cavium are currently parties to various claims and litigation related to this registration statement and could be subject to additional litigation related to the Merger (or any failure to complete the Merger) or to a proceeding commenced against Marvell or Cavium to enforce performance of their respective obligations under the Merger Agreement. If the Merger is not completed, these risks may materialize and may adversely affect Marvell’s and Cavium’s respective businesses, financial condition, financial results and share prices.

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Litigation filed against Marvell and/or Cavium could prevent or delay the completion of the Merger or result in the payment of damages following completion of the Merger.

Marvell, Cavium and members of Cavium’s board of directors currently are and may in the future be parties, among others, to various claims and litigation related to the Merger Agreement and the Merger, including putative shareholder class actions. For additional information regarding the pending litigation, please see the section entitled “The Merger—Litigation Related to the Merger.” Among other remedies, the plaintiffs in such matters are seeking to enjoin the Merger. The results of complex legal proceedings are difficult to predict, and could delay or prevent the Merger from becoming effective in a timely manner. The existence of litigation relating to the Merger could impact the likelihood of obtaining the required approvals from either Marvell’s or Cavium’s shareholders. Moreover, the pending litigation and any future additional litigation could be time consuming and expensive, could divert Marvell’s and Cavium’s management’s attention away from their regular businesses, and, if any one of these lawsuits is adversely resolved against either Marvell or Cavium, could have a material adverse effect on Marvell’s or Cavium’s respective financial condition.

One of the conditions to Cavium’s obligation to complete the Merger is that no temporary restraining order, preliminary or permanent injunction or other binding order preventing the completion of the Merger shall have been issued by any court of competent jurisdiction in the United States and remain in effect. Similarly, one of the conditions to Marvell’s obligation to complete the Merger is that no temporary restraining order, preliminary or permanent injunction or other binding order preventing the completion of the Merger shall have been issued by any court of any specified jurisdiction and remain in effect. Marvell’s obligations to complete the Merger is also conditioned on, among other things, there being no pending or overtly threatened legal proceeding brought by a governmental body (a) challenging or seeking to restrain or prohibit the completion of the Merger or any of the transactions contemplated by the Merger Agreement; (b) seeking to prohibit or limit in any material respect Marvell’s ability to vote, receive dividends with respect to or otherwise exercise ownership rights with respect to the stock of the surviving corporation in the Merger; (c) that could materially and adversely affect the right of Marvell or Cavium or any of its subsidiaries to own the assets or operate the business of Cavium and its subsidiaries; (d) seeking to compel Cavium or Marvell or any of their respective subsidiaries to dispose of or hold separate any material assets as a result of the Merger or any of the other transactions contemplated by the Merger Agreement; or (e) relating to the Merger or any of the other transactions contemplated by the Merger Agreement and seeking to impose (or that would reasonably be expected to result in the imposition of) any criminal sanctions or criminal liability on Marvell or Cavium or any of Cavium’s subsidiaries or any of the officers, directors or affiliates of Marvell or Cavium or any of Cavium’s subsidiaries.

Consequently, if a settlement or other resolution is not reached in the potential lawsuits referenced above and the plaintiffs secure injunctive or other relief prohibiting, delaying or otherwise adversely affecting Marvell’s or Cavium’s ability to complete the Merger on the terms contemplated by the Merger Agreement, or there is a pending or overtly threatened legal proceeding brought by a governmental party as described above, then the Merger may not become effective in a timely manner or at all.

Risk Factors Relating to the Combined Company Following the Merger

Marvell may fail to realize the benefits expected from the Merger, which could adversely affect Marvell’s share price.

The anticipated benefits Marvell expects from the Merger are, necessarily, based on projections and assumptions about the combined businesses of Marvell and Cavium, which may not materialize as expected or which may prove to be inaccurate. The value of Marvell common shares following the completion of the Merger could be adversely affected if Marvell is unable to realize the anticipated benefits from the Merger on a timely basis or at all. Achieving the benefits of the Merger will depend, in part, on Marvell’s ability to integrate the business and operations of Cavium successfully and efficiently with Marvell’s business. The challenges involved in this integration, which will be complex and time-consuming, include the following:

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If Marvell does not successfully manage these issues and the other challenges inherent in integrating an acquired business of the size and complexity of Cavium, then Marvell may not achieve the anticipated benefits of the Merger on a timely basis or at all and Marvell’s revenue, expenses, operating results and financial condition could be materially adversely affected.

Marvell may be unable to realize anticipated cost synergies and expects to incur substantial expenses related to the Merger, which could have a material adverse effect on Marvell’s business, financial condition and results of operations.

Marvell expects to generate cost synergies of at least $150 million to $175 million within 18 months after completion of the Merger.

Marvell’s ability to achieve such estimated cost synergies in the timeframe described, or at all, is subject to various assumptions by Marvell’s management, which may or may not prove to be accurate, as well as the incurrence of costs in Marvell’s operations that offset all or a portion of such cost synergies. As a consequence, Marvell may not be able to realize all of these cost synergies within the timeframe expected or at all. In addition, Marvell may incur additional or unexpected costs in order to realize these cost synergies. Failure to achieve the expected cost synergies could significantly reduce the expected benefits associated with the Merger.

In addition, Marvell has incurred and will incur substantial expenses in connection with completion of the Merger, including the costs and expenses of preparing and filing the Form S-4 Registration Statement that contains this joint proxy statement/prospectus with the SEC.

Marvell expects to continue to incur non-recurring costs associated with consummating the Merger, combining the operations of the two companies and achieving the desired cost synergies. These fees and costs have been, and will continue to be, substantial. The substantial majority of non-recurring expenses will consist of transaction costs related to the Merger and include, among others, fees paid to financial, legal and accounting advisors, employee benefit costs and filing fees.

The costs described above, as well as other unanticipated costs and expenses, could have a material adverse effect on the financial condition and operating results of Marvell following the completion of the Merger and many of these costs will be borne by Marvell even if the Merger is not completed.

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The business and operating results of Marvell could be harmed by the highly cyclical nature of the semiconductor industry.

Marvell and Cavium operate in the semiconductor industry. Historically, the semiconductor industry has been highly cyclical with recurring periods of diminished product demand. Significant downturns in the semiconductor industry are often experienced in connection with, or in anticipation of, excess manufacturing capacity worldwide, maturing product cycles and declines in general economic conditions. Even if demand for the products and solutions of Marvell and Cavium remains constant after the completion of the Merger, oversupply in the semiconductor industry may create competitive pressures that can degrade pricing levels and reduce revenues of the combined company. Any failure to expand in cycle upturns to meet customer demand and delivery requirements or contract in cycle downturns at a pace consistent with cycles in the industry could have an adverse effect on the business of the combined company.

Marvell shareholders and Cavium shareholders will have a reduced ownership and voting interest after completion of the Merger and will exercise less influence over management.

Marvell shareholders currently have the right to vote on the election of the board of directors of Marvell and on other matters affecting Marvell. Similarly, Cavium shareholders currently have the right to vote on the election of the board of directors of Cavium and on other matters affecting Cavium. Immediately following the Merger, Marvell shareholders will own approximately 76.7% of Marvell common shares, and Cavium’s shareholders will own approximately 23.3% of Marvell common shares, based on the number of Marvell common shares issued and shares of Cavium common stock outstanding as of January 22, 2018. As a result, current Marvell shareholders and current Cavium shareholders will have less influence on the management and policies of the combined company than they now have on the management and policies of Marvell and Cavium, respectively.

Uncertainties associated with the Merger may cause a loss of employees and may otherwise materially adversely affect the future business and operations of the combined company.

The combined company’s success after the Merger will depend in part upon the ability of the combined company to retain executive officers and key employees of Marvell and Cavium. In some of the fields in which Marvell and Cavium operate, there are only a limited number of people in the job market who possess the requisite skills and it may be increasingly difficult for the combined company to hire qualified personnel over time. The combined company will operate in several geographic locations where the labor markets, especially for engineers, are particularly competitive. Each of Marvell and Cavium has experienced difficulty in hiring and retaining sufficient numbers of qualified management, technical, application engineering, marketing, sales and support personnel in parts of their respective businesses.

Current and prospective employees of Marvell and Cavium may experience uncertainty about their roles with the combined company following the Merger. In addition, key employees may depart because of issues relating to the uncertainty and difficulty of integration or a desire not to remain with the combined company following the Merger. The loss of services of any key personnel or the inability to hire new personnel with the requisite skills could restrict the ability of the combined company to develop new products or enhance existing products in a timely manner, to sell products to customers or to manage the business of the combined company effectively. Also, the business, financial condition and results of operations of the combined company could be materially adversely affected by the loss of any of its key employees, by the failure of any key employee to perform in his or her current position, or by the combined company’s inability to attract and retain skilled employees, particularly engineers.

Third parties may claim that the combined company is infringing their intellectual property, and the combined company could suffer significant litigation or licensing expenses or be prevented from selling its products or services.

The semiconductor industry is characterized by uncertain and conflicting intellectual property claims and vigorous protection and pursuit of these rights. Each of Marvell and Cavium is frequently involved in disputes

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regarding patent and other intellectual property rights. Each of Marvell and Cavium has in the past received, and the combined company may in the future receive, communications from third parties asserting that certain of its products, processes or technologies infringe upon their patent rights, copyrights, trademark rights or other intellectual property rights. The combined company may also receive claims of potential infringement. Defending these claims may be costly and time consuming, and may divert the attention of management and key personnel from other business issues. The complexity of the technology involved and the uncertainty of intellectual property litigation increase these risks. Claims of intellectual property infringement also might require the combined company to enter into costly royalty or license agreements. The combined company may be unable to obtain royalty or license agreements on acceptable terms, or at all. Similarly, changing its products or processes to avoid infringing the rights of others may be costly or impractical. The combined company may also be subject to significant damages or injunctions against development and sale of certain of its products and services. Resolution of such disputes could have a material adverse effect on the combined company’s results of operations or financial condition and may require material changes in production processes and products.

The combined company may not be able to adequately protect or enforce its intellectual property rights, which could harm its competitive position.

The combined company’s success and future revenue growth will depend, in part, on its ability to protect its intellectual property. The combined company will primarily rely on patent, copyright, trademark and trade secret laws, as well as non-disclosure agreements and other methods, to protect its proprietary technologies and processes. It is possible that competitors or other unauthorized third parties may obtain, copy, use or disclose, illegally or otherwise, the combined company’s proprietary technologies and processes, despite efforts by the combined company to protect its proprietary technologies and processes. While the combined company will hold a significant number of patents, there can be no assurances that any additional patents will be issued. Even if new patents are issued, the claims allowed may not be sufficiently broad to protect the combined company’s technology. In addition, any of Marvell’s or Cavium’s existing patents, and any future patents issued to the combined company, may be challenged, invalidated or circumvented, either in connection with the Merger or otherwise. As such, any rights granted under these patents may not provide the combined company with meaningful protection. Marvell and Cavium may not have, and in the future the combined company may not have, foreign patents or pending applications corresponding to its U.S. patents and applications. Even if foreign patents are granted, effective enforcement in foreign countries may not be available. If the combined company’s patents do not adequately protect its technology, competitors may be able to offer products similar to the combined company’s products. The combined company’s competitors may also be able to develop similar technology independently or design around its patents.

The Merger could have an adverse effect on the Marvell and Cavium brands.

The success of Marvell and Cavium is largely dependent upon the ability of Marvell and Cavium to maintain and enhance the value of their respective brands, their customers’ connection to and perception of the brands, and a positive relationship with customers and suppliers. Brand value, and as a result the businesses and results of operations of Marvell and Cavium, could be severely damaged if the Merger receives considerable negative publicity or if customers or suppliers otherwise come to have a diminished view of the brands as a result of the Merger or the common ownership of the existing businesses.

The use of cash and incurrence of substantial indebtedness in connection with the financing of the Merger may have an adverse impact on Marvell’s liquidity, limit Marvell’s flexibility in responding to other business opportunities and increase Marvell’s vulnerability to adverse economic and industry conditions.

The Merger will be financed in part by the use of Marvell’s cash on hand, Cavium’s cash on hand and the incurrence of a significant amount of indebtedness. As of December 23, 2017, Marvell had approximately $808.8 million of cash and cash equivalents and approximately $965.7 million of short-term investments. As of December 31, 2017, Cavium had approximately $140.5 million of cash and cash equivalents. In connection with

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the Merger, Marvell expects to obtain debt financing totaling $1.75 billion. The proceeds from the debt financing are expected to be used to pay, in part, the cash portion of the Merger Consideration, to refinance certain existing indebtedness of Cavium and to pay related fees and expenses. The use of cash on hand and indebtedness to finance the acquisition will reduce Marvell’s liquidity and could cause Marvell to place more reliance on cash generated from operations to pay principal and interest on Marvell’s debt, thereby reducing the availability of Marvell’s cash flow for working capital, dividend and capital expenditure needs or to pursue other potential strategic plans. Marvell expects that the agreements it will enter into with respect to the indebtedness it will incur to finance the Merger will contain restrictive covenants, including financial covenants requiring Marvell to maintain specified financial ratios and limitations on Marvell’s ability to incur additional liens and indebtedness or to pay dividends and make certain investments. Marvell’s ability to comply with these restrictive covenants can be affected by events beyond its control. The indebtedness and these restrictive covenants will also have the effect, among other things, of limiting Marvell’s ability to obtain additional financing, if needed, limiting its flexibility in the conduct of its business and making Marvell more vulnerable to economic downturns and adverse competitive and industry conditions. In addition, a breach of the restrictive covenants could result in an event of default with respect to the indebtedness, which, if not cured or waived, could result in the indebtedness becoming immediately due and payable and could have a material adverse effect on Marvell’s business, financial condition or operating results.

Because of higher debt levels, Marvell may not be able to service its debt obligations in accordance with their terms after the completion of the Merger.

Marvell’s ability to meet its expense and debt service obligations contained in the agreements Marvell expects to enter into with respect to the indebtedness Marvell will incur to finance the Merger will depend on Marvell’s available cash and its future performance, which will be affected by financial, business, economic and other factors, including potential changes in laws or regulations, industry conditions, industry supply and demand balance, customer preferences, the success of Marvell’s products and pressure from competitors. If Marvell is unable to meet its debt service obligations after the Merger or should Marvell fail to comply with its financial and other restrictive covenants contained in the agreements governing its indebtedness, Marvell may be required to refinance all or part of its debt, sell important strategic assets at unfavorable prices, incur additional indebtedness or issue common shares or other equity securities. Marvell may not be able to, at any given time, refinance its debt, sell assets, incur additional indebtedness or issue equity securities on terms acceptable to Marvell, in amounts sufficient to meet Marvell’s needs. If Marvell is able to raise additional funds through the issuance of equity securities, such issuance would also result in dilution to Marvell’s shareholders. Marvell’s inability to service its debt obligations or refinance its debt could have a material adverse effect on its business, financial condition or operating results after the Merger. In addition, Marvell’s debt obligations may limit its ability to make required investments in capacity, technology or other areas of its business, which could have a material adverse effect on its business, financial condition or operating results.

The Merger may result in significant charges or other liabilities, including taxes, that could adversely affect the financial results of the combined company.

The financial results of the combined company may be adversely affected by cash expenses and non-cash accounting charges incurred in connection with Marvell’s integration of the business and operations of Cavium. The amount and timing of these possible charges are not yet known. Further, Marvell’s failure to identify or accurately assess the magnitude of certain liabilities that Marvell is assuming in the Merger could result in unexpected litigation or regulatory exposure, unfavorable accounting charges, unexpected increases in taxes due, a loss of anticipated tax benefits or other adverse effects on Marvell’s business, operating results or financial condition. The price of Marvell common shares following the Merger could decline to the extent the combined company’s financial results are materially affected by any of these events.

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Marvell’s actual financial position and results of operations may differ materially from the unaudited pro forma financial data included herein.

The unaudited pro forma financial data included herein are presented for illustrative purposes only and are not necessarily indicative of what Marvell’s actual financial position or results of operations would have been had the Merger been completed on the dates indicated. These data reflect adjustments, which are based upon preliminary estimates, to allocate the purchase price to Cavium’s net assets. The purchase price allocation reflected in this joint proxy statement/prospectus is preliminary, and final allocation of the purchase price will be based upon the actual purchase price and the fair value of the assets and liabilities of Cavium as of the closing date of the Merger. In addition, subsequent to the closing date of the Merger, there may be further refinements of the purchase price allocation as additional information becomes available.

Accordingly, the final purchase accounting adjustments might differ materially from the pro forma adjustments reflected herein. See “Selected Unaudited Pro Forma Condensed Combined Financial Information” for more information.

The unaudited prospective financial information of Marvell and Cavium included in this joint proxy statement/prospectus involves risks, uncertainties and assumptions, many of which are beyond the control of Marvell and Cavium. As a result, it may not prove to be accurate and is not necessarily indicative of current values or future performance.

The unaudited prospective financial information of Marvell and Cavium referred to in “The Merger—Opinion of Marvell’s Financial Advisor, Goldman Sachs,” “The Merger—Opinions of Cavium’s Financial Advisors, Qatalyst Partners and J.P. Morgan—Opinion of Qatalyst Partners,” “The Merger—Opinions of Cavium’s Financial Advisors, Qatalyst Partners and J.P. Morgan—Opinion of J.P. Morgan” and contained in “The Merger—Unaudited Prospective Financial Information,” involves risks, uncertainties and assumptions and is not a guarantee of future performance. While the unaudited prospective financial information utilized by Marvell, Cavium and their respective advisors in connection with the Merger and summarized in this joint proxy statement/statement were prepared in good faith based on information available at the time of preparation, no assurances can be made regarding future events or that the assumptions made in preparing such unaudited prospective financial information will accurately reflect future conditions. In preparing such unaudited prospective financial information, the management of Marvell and Cavium each made assumptions regarding, among other things, future economic, competitive, regulatory and financial market conditions and future business decisions that may not be realized and that are inherently subject to significant uncertainties and contingencies, including, among others, risks and uncertainties described or incorporated by reference in this section and the section entitled “Cautionary Note Concerning Forward-Looking Statements,” all of which are difficult to predict and many of which are beyond the control of Marvell and Cavium and, if the Merger is completed, will be beyond the control of the combined company. Thus, the future financial results of Marvell and Cavium and, if the Merger is completed, the combined company, may materially differ from those expressed in the unaudited prospective financial information due to factors that are beyond Marvell’s and Cavium’s ability to control or predict. There can be no assurance that Marvell’s or Cavium’s unaudited prospective financial information will be realized or that Marvell’s or Cavium’s future financial results will not materially vary from the applicable unaudited prospective financial information. As a result, the unaudited prospective financial information cannot be considered predictive of actual future operating results, and this information should not be relied on as such. The unaudited prospective financial information covers multiple years, and the information by its nature becomes subject to greater uncertainty with each successive year. The unaudited prospective financial information does not take into account any circumstances or events occurring after the date it was prepared.

More specifically, the unaudited prospective financial information:

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The unaudited prospective financial information was not prepared with a view toward public disclosure or compliance with published guidelines of the SEC or the American Institute of Certified Public Accountants for preparation and presentation of prospective financial information or U.S. generally accepted accounting principles (“GAAP”) and does not reflect the effect of any proposed or other changes in GAAP that may be made in the future.

Risk Factors Relating to Marvell Common Shares

Cavium shareholders will become shareholders of Marvell upon receipt of Marvell common shares, which will change certain shareholder rights and privileges they hold as shareholders of Cavium.

Cavium shareholders will receive Marvell common shares as part of the Merger Consideration. There are a number of differences between the rights of a shareholder of Cavium and the rights of a shareholder of Marvell. We urge Cavium shareholders to review the discussion “Comparison of Rights of Shareholders” beginning on page 187.

The market for Marvell common shares may be adversely affected by the issuance of shares in the Merger.

In connection with the Merger, Marvell will issue an estimated 150.46 million Marvell common shares to Cavium shareholders, based on the number of shares of Cavium common stock outstanding on January 22, 2018, and will assume certain outstanding Cavium equity awards pursuant to the terms of the Merger Agreement. The increase in the number of issued Marvell common shares may lead to sales of such shares or the perception that such sales may occur, either of which may adversely affect the market for, and the market price of, Marvell common shares.

Other Risks

Additional Risks Relating to Marvell and Cavium.

Marvell and Cavium are, and following completion of the Merger Marvell will continue to be, subject to the risks described in (a) Part I, Item 1A in Marvell’s Annual Report on Form 10-K for the fiscal year ended January 28, 2017, and its Quarterly Reports on Form 10-Q for the quarterly periods ended April 29, 2017, July 29, 2017 and October 28, 2017, and (b) Part I, Item 1A in Cavium’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016. See the section entitled “Documents Incorporated by Reference” beginning on page 238 for more information.

Marvell is incorporated in Bermuda, and, as a result, it may not be possible for Marvell shareholders to enforce civil liability provisions of the securities laws of the United States. In addition, Marvell’s Bye-laws contain a waiver of claims or rights of action by Marvell’s shareholders against Marvell officers and directors, which will severely limit Marvell’s shareholders’ right to assert a claim against Marvell’s officers and directors under Bermuda law.

Marvell is organized under the laws of Bermuda. As a result, it may not be possible for Marvell shareholders to effect service of process within the United States upon Marvell, or to enforce against Marvell in U.S. courts’

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judgments based on the civil liability provisions of the securities laws of the United States. There is significant doubt as to whether the courts of Bermuda would recognize or enforce judgments of U.S. courts obtained against Marvell or Marvell’s directors or officers based on the civil liability provisions of the securities laws of the United States or any state, or hear actions brought in Bermuda against Marvell or those persons based on those laws. The United States and Bermuda do not currently have a treaty providing for the reciprocal recognition and enforcement of judgments in civil and commercial matters. Therefore, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not based solely on U.S. federal or state securities laws, would not be automatically enforceable in Bermuda.

Marvell’s Bye-laws contain a broad waiver by Marvell’s shareholders of any claim or right of action, both individually and on Marvell’s behalf, against any of Marvell’s officers and directors. The waiver applies to any action taken by an officer or director, or the failure of an officer or director to take any action, in the performance of his or her duties with or for Marvell, other than with respect to any matter involving any fraud or dishonesty on the part of the officer or director or to any matter arising under U.S. federal securities laws. This waiver will limit the rights of Marvell’s shareholders to assert claims against Marvell’s officers and directors unless the act complained of involves fraud or dishonesty or arises as a result of a breach of U.S. federal securities laws. Therefore, so long as acts of business judgment do not involve fraud or dishonesty or arise as a result of a breach of U.S. federal securities laws, they will not be subject to shareholder claims under Bermuda law. For example, shareholders will not have claims against officers and directors for negligence, malfeasance or a breach of trust, unless the breach rises to the level of fraud or dishonesty, or arises as a result of a breach of U.S. federal securities laws.

In order to facilitate the satisfaction of any of the closing conditions relating to regulatory matters, Marvell could decide to commit to change its place of domicile from Bermuda to Delaware or restructure to become a wholly owned subsidiary of a new corporation incorporated in Delaware. Any such transaction would change the rights of the shareholders of Marvell, including former Cavium shareholders.

Marvell is organized under the laws of Bermuda. Several regulatory approvals are conditions to completion of the Merger. The decision of regulators whether, when or under what circumstances to approve the Merger may be affected by whether Marvell is a Bermuda corporation or a U.S. corporation. In order to facilitate the satisfaction of any of the conditions to the completion of the Merger relating to regulatory matters, Marvell could decide to (but is not obligated to) commit to change its place of domicile or organization from Bermuda to Delaware (a “Domestication”) or restructure to become a wholly owned subsidiary of a new corporation incorporated in Delaware (a “Holding Company Restructuring”).

Marvell cannot predict whether or not it will be necessary to commit to any such actions in order to satisfy any of the conditions to the completion of the Merger relating to regulatory matters, or whether Marvell would commit to do so even if necessary to obtain regulatory approval. If Marvell were to commit to a Domestication, that transaction would not be implemented until after the completion of the Merger. If Marvell were to commit to a Holding Company Restructuring, it could delay the completion of the Merger.

If Marvell elects to implement a Domestication, Marvell would not need to obtain shareholder approval of that transaction, and Marvell shareholders would not have statutory rights of appraisal or any other appraisal rights under either Bermuda or Delaware law. If Marvell elects to implement a Holding Company Restructuring, Marvell would need to obtain shareholder approval of the transaction, and Marvell shareholders would have statutory rights of appraisal under Bermuda law.

If Marvell implements either a Domestication or a Holding Company Restructuring, Marvell shareholders (including former Cavium shareholders) would hold shares in a Delaware corporation. There would be a number of differences between the rights of shareholders of Marvell under Bermuda law and the rights of shareholders under Delaware law. See the section entitled “Possible Domestication or Holding Company Restructuring of Marvell” for more information on these differences.

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If Marvell elects to implement a Domestication or a Holding Company Restructuring, there may be adverse U.S. federal income tax consequences to Marvell and shareholders of Marvell, including former Cavium shareholders.

Marvell is a Bermuda parent holding company with various foreign and U.S. subsidiaries. The applicable corporate income tax rate in the jurisdictions in which Marvell operates varies. Marvell’s current effective corporate income tax rate is based upon the application of currently applicable income tax laws, regulations and treaties in the many jurisdictions in which it operates. If Marvell elects to implement a Domestication or a Holding Company Restructuring, Marvell (in the case of a Domestication) or the new Delaware parent corporation (in the case of a Holding Company Restructuring) (“Delaware HoldCo”) will be subject to U.S. taxation on its income and capital gains. Also, Marvell or Delaware HoldCo, as applicable, will be subject to U.S. taxation on certain income of its non-U.S. subsidiaries (which would include Marvell, a Bermuda company, if it becomes a subsidiary of Delaware HoldCo). Either a Domestication or a Holding Company Restructuring would increase the potential for U.S. taxes on Marvell’s income by placing its foreign subsidiaries under a U.S. corporation. As a result of a Domestication or a Holding Company Restructuring, Marvell’s effective corporate tax rate may increase significantly, which could adversely impact Marvell’s financial results, including earnings and cash flow, for taxable periods after the completion of a Domestication or a Holding Company Restructuring. Marvell is unable to predict the impact of a Domestication or a Holding Company Restructuring on its effective tax rate going forward, and such changes could be significant.

Tax consequences differ between a Domestication and a Holding Company Restructuring. If Marvell elects to implement a Domestication, a U.S. holder (as defined below in the section entitled “Material United States Federal Income Tax Consequences”) who owns Marvell common shares with a fair market value of $50,000 or more, but less than 10% of Marvell’s issued common shares (measured by either value or total combined voting power and taking into account attribution rules), on the day of such Domestication generally would be required to recognize gain (but not loss) with respect to such Marvell common shares as a result of such Domestication, even if the U.S. holder continued to hold the shares and notwithstanding that the U.S. holder would not receive any cash or liquidity as a result of such Domestication. As an alternative to recognizing gain, such U.S. holder may elect to include in income the “all earnings and profits amount” attributable to such shares as that term is defined in Treasury Regulation Section 1.367(b)-2(d). Marvell expects that it will have a material amount of earnings and profits at the effective time of a Domestication, and thus a U.S. holder’s election to include in income the “all earnings and profits amount” may not be advantageous, depending on the U.S. holder’s tax basis and holding period for Marvell common shares. Any U.S. holder who owns 10% or more of Marvell’s issued common shares on the day of such Domestication generally would be required to pay taxes on a deemed dividend equal to the “all earnings and profits amount” attributable to those shares. Any U.S. holder who owns Marvell common shares with a fair market value of less than $50,000 on the day of such Domestication generally would not recognize any gain or loss and would not be required to include any part of the “all earnings and profits amount” in income.

If, instead of implementing a Domestication, Marvell implements a Holding Company Restructuring, Marvell expects that U.S. holders of Marvell common shares generally would not recognize gain or loss upon the exchange of their Marvell common shares for Delaware HoldCo shares.

Individual Marvell shareholders may be subject to tax consequences in addition to, or that vary from, the potential tax consequences discussed in this risk factor. Shareholders who fail to consult their own tax advisors could therefore be subject to unforeseen tax consequences as a result of a potential Domestication or Holding Company Restructuring.

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FINANCIAL SUMMARY

Comparative Market Price Data for Marvell and Cavium

Marvell common shares and shares of Cavium common stock are traded on NASDAQ under the symbols “MRVL” and “CAVM,” respectively. The following table presents trading information for Marvell common shares and Cavium common stock on November 2, 2017, the last trading day prior to the first media report stating that Marvell and Cavium were in advanced discussions regarding a potential transaction, November 17, 2017, the last trading day prior to the public announcement of the Merger, and January 22, 2018, the last practicable trading day prior to the filing of this joint proxy statement/prospectus with the SEC. On February 2, 2018, the Marvell record date, there were 495,909,755 Marvell common shares issued. On February 2, 2018, the Cavium record date, there were 69,731,912 shares of Cavium common stock issued and outstanding.

The following table shows the high and low sales prices of Marvell common shares and Cavium common stock as reported by NASDAQ for the indicated calendar quarters. For current price information, you are urged to consult publicly available sources.

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Marvell Dividends

On May 17, 2012, Marvell announced that Marvell’s board of directors had authorized the adoption of a quarterly cash dividend policy. Under the cash dividend policy, holders of Marvell common shares receive dividends when and as declared by Marvell’s board of directors. In fiscal year 2017, Marvell declared aggregate cash dividends of $0.24 per common share of Marvell, totaling $122.3 million. Marvell may modify, suspend or cancel its cash dividend policy at any time.

The following table provides information about the quarterly dividends declared by Marvell’s board of directors in the last four fiscal years.

Cavium Dividends

Cavium has not paid any cash dividends with respect to Cavium common stock.

Selected Historical Consolidated Financial Data of Marvell

The following table presents selected historical consolidated financial data of Marvell, (i) as of and for each of the fiscal years within the five year period ending January 28, 2017, (ii) for the nine months ended October 28, 2017 and October 29, 2016, and (iii) as of October 28, 2017.

The consolidated statement of operations data for the fiscal years ended January 28, 2017, January 30, 2016, and January 31, 2015 and the consolidated balance sheet data as of January 28, 2017 and January 30, 2016 have been derived from Marvell’s audited consolidated financial statements included in Marvell’s Annual Report on Form 10-K for the fiscal year ended January 28, 2017 and incorporated by reference in this joint proxy statement/prospectus. The consolidated statement of operations data for the fiscal years ended February 1, 2014 and February 2, 2013 and the consolidated balance sheet data as of January 31, 2015, February 1, 2014 and February 2, 2013 have been derived from Marvell’s consolidated financial statements for such periods, which have not been incorporated into this joint proxy statement/prospectus by reference.

The consolidated statement of operations data for the nine months ended October 28, 2017 and October 29, 2016 and the condensed consolidated balance sheet data as of October 28, 2017 have been derived from Marvell’s

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unaudited condensed consolidated financial statements included in its Quarterly Report on Form 10-Q for the fiscal quarter ended October 28, 2017, which is incorporated by reference in this joint proxy statement/prospectus. You should read the following selected financial data together with Marvell’s “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Marvell’s historical consolidated financial statements, including the related notes, and the other information contained or incorporated by reference in this joint proxy statement/prospectus. See “Documents Incorporated by Reference” for more information.

The results of operations for the historical periods included in the following table are not necessarily indicative of the results to be expected for future periods.

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Selected Historical Consolidated Financial Data of Cavium

The following table sets forth certain selected financial information for Cavium as of the end of and for the periods indicated. The selected consolidated statements of operations data for the years ended December 31, 2016, 2015 and 2014 and the selected consolidated balance sheet data as of December 31, 2016 and 2015 are derived from, and qualified by reference to, the audited consolidated financial statements included in Cavium’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016, which is incorporated by reference into this joint proxy statement/prospectus. The selected consolidated statements of operations data for the years ended December 31, 2013 and 2012 and the selected consolidated balance sheet data as of December 31, 2014, 2013 and 2012 are derived from Cavium’s audited consolidated financial statements, which are not incorporated by reference into this joint proxy statement/prospectus. The selected consolidated statements of operations for the nine months ended September 30, 2017 and 2016, and the selected consolidated balance sheet data as of September 30, 2017 are derived from, and qualified by reference to, Cavium’s unaudited condensed consolidated financial statements included in Cavium’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, which is incorporated by reference into this joint proxy statement/prospectus. You should read the summary selected financial data together with Cavium’s “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Cavium’s historical consolidated financial statements, including the related notes thereto and the other information contained or incorporated by reference in this joint proxy statement/prospectus. The historical results are not necessarily indicative of results to be expected in the future. See “Where to Obtain Additional Information” for more information.

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SELECTED UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

The following table sets forth Marvell’s selected unaudited pro forma condensed combined financial information as of October 28, 2017 and for the year ended January 28, 2017 and the nine months ended October 28, 2017.

The selected unaudited pro forma condensed combined financial information is based upon the historical financial statements of Marvell, after giving effect to the Merger. The selected unaudited pro forma condensed combined financial information also gives effect to the transactions undertaken to finance the Merger. The selected unaudited pro forma condensed combined balance sheet data as of October 28, 2017 combines the historical balance sheet of Marvell, giving effect to the Merger, and the Financing Transactions (as defined in the section entitled “Unaudited Pro Forma Condensed Combined Financial Information”), as if they had been completed on October 28, 2017. The selected unaudited pro forma condensed combined statements of operations data for the twelve months ended January 28, 2017 and the nine months ended October 28, 2017, give effect to the Merger, the QLogic Acquisition (as defined in the section entitled “Unaudited Pro Forma Condensed Combined Financial Information”) and the Financing Transactions, as if they had occurred on January 31, 2016.

The Merger will be accounted for using the acquisition method of accounting. The pro forma adjustments reflect adjustments required under GAAP for business combinations and are based upon, among other things, preliminary estimates of fair market values of assets acquired and liabilities assumed and certain assumptions that we believe are reasonable. Revisions to the preliminary estimates of fair market value may have a significant impact on the pro forma amounts of total assets, total liabilities and total shareholders’ equity, depreciation and amortization expense, interest expense and income tax expense. The actual adjustments to Marvell’s consolidated financial statements upon the completion of the Merger will depend on a number of factors, including additional information available and Marvell’s net assets on the closing date of the Merger. Therefore, the actual adjustments will differ from the pro forma adjustments, and the differences may be material. The selected unaudited pro forma condensed combined statements of operations do not reflect any non-recurring charges or gains that Marvell may record in connection with the Merger. However, these estimated non-recurring items will be reflected in Marvell’s statement of operations for the period during which the Merger will take place.

The selected unaudited pro forma condensed combined financial information set forth below should be read in conjunction with the information included under the headings “The Merger Agreement,” “Unaudited Pro Forma Condensed Combined Financial Information,” “Selected Historical Consolidated Financial Data of Marvell” and “Selected Historical Consolidated Financial Data of Cavium,” as well as Marvell’s consolidated financial statements and related notes thereto, Cavium’s consolidated financial statements and related notes thereto, and QLogic’s consolidated financial statements and related notes thereto, each of which is incorporated by reference into this joint proxy statement/prospectus.

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Selected Unaudited Pro Forma Statements of Operations Data and Selected Pro Forma  Balance Sheet Data

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COMPARATIVE HISTORICAL AND UNAUDITED PRO FORMA AND PER SHARE FINANCIAL INFORMATION

The following table reflects historical information about basic and diluted net income (loss) per share from continuing operations and cash dividends declared per share for the fiscal year ended January 28, 2017 and nine months ended October 28, 2017, in the case of Marvell, and for the fiscal year ended December 31, 2016 and nine months ended September 30, 2017, in the case of Cavium, and the book value per common share as of October 28, 2017 in the case of Marvell and as of September 30, 2017 in the case of Cavium, in each case, on a historical basis, and for Marvell and Cavium on an unaudited pro forma condensed combined basis after giving effect to the Merger and the Financing Transactions. The pro forma data of the combined company assumes the Merger was complete and were derived by combining the historical consolidated financial information of Marvell and Cavium, which also includes Cavium’s acquisition of QLogic in the period ended December 31, 2016, as described elsewhere in this joint proxy statement/prospectus. For a discussion of the assumptions and adjustments made in preparing the unaudited pro forma combined financial information presented in this document, see “Unaudited Pro Forma Condensed Combined Financial Information.”

Cavium shareholders should read the information presented in the following table together with the historical statements of Marvell, Cavium and QLogic and the related notes, which are incorporated herein by reference, and the “Unaudited Pro Forma Condensed Combined Financial Information” appearing elsewhere in this joint proxy statement/prospectus. The pro forma data are unaudited and for illustrative purposes only. Cavium shareholders should not rely on this information as being indicative of the historical results that would have been achieved during the periods presented had the companies always been combined or the future results that the combined company will achieve after the completion of the Merger. This pro forma information is subject to risks and uncertainties, including those discussed in “Risk Factors.”

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CAUTIONARY NOTE CONCERNING FORWARD-LOOKING STATEMENTS

This joint proxy statement/prospectus, including the information and other documents incorporated by reference into this joint proxy statement/prospectus, contains or incorporates by reference or may contain or may incorporate by reference “forward-looking statements” that have been made pursuant to the provisions of, and in reliance on the safe harbor under, the Private Securities Litigation Reform Act of 1995, including without limitation statements regarding the benefits of the Merger, the anticipated timing of the Merger and the products and markets of each company. These statements, which involve risks and uncertainties, relate to analyses and other information that are based on forecasts of future results and estimates of amounts not yet determinable and may also relate to future prospects, developments and business strategies. 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 made based on expectations and beliefs concerning future events affecting Marvell and Cavium and are subject to uncertainties and factors relating to their respective operations and business environment, all of which are difficult to predict and many of which are beyond their control, that could cause their actual results to differ materially from those matters expressed in or implied by these forward-looking statements.

The forward-looking statements involve risks and uncertainties. The ability of either Marvell or Cavium to predict results or actual effects of its plans and strategies is inherently uncertain. Accordingly, actual results may differ materially from those expressed in, or implied by, the forward-looking statements. Some of the factors that may cause actual results or earnings to differ materially from those contemplated by the forward-looking statements include, but are not limited to, those discussed under “Risk Factors” and those discussed in the filings of each of Marvell and Cavium that are incorporated herein by reference, including the following:

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Because these forward-looking statements are subject to assumptions and uncertainties, actual results might differ materially from those expressed or implied by these forward-looking statements. You are cautioned not to place undue reliance on these statements, which speak only as of the date of this joint proxy statement/prospectus or the date of any document incorporated by reference in this joint proxy statement/prospectus.

All subsequent written and oral forward-looking statements concerning the Merger or other matters addressed in this joint proxy statement/prospectus and attributable to Marvell or Cavium or any person acting on their behalf are expressly qualified in their entirety by the cautionary notes contained or referred to in this section. Except to the extent required by applicable law or regulation, Marvell and Cavium undertake no obligation to update these forward-looking statements to reflect events or circumstances after the date of this joint proxy statement/prospectus or to reflect the occurrence of unanticipated events. Neither Marvell nor Cavium gives any assurance that either Marvell or Cavium will achieve its expectations.

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THE MARVELL GENERAL MEETING

Overview

This joint proxy statement/prospectus is being provided to Marvell shareholders as part of a solicitation of proxies by the Marvell board of directors for use at the general meeting of Marvell shareholders and at any adjournments or postponements thereof. This joint proxy statement/prospectus is first being furnished to shareholders of Marvell on or about February 7, 2018. In addition, this joint proxy statement/prospectus constitutes a prospectus for Marvell in connection with the Marvell Share Issuance.

Date, Time and Place of the Marvell General Meeting

The general meeting of Marvell shareholders will be held at the offices of Marvell Semiconductor, Inc. located at 5488 Marvell Lane, Santa Clara, California 95054, on March 16, 2018 at 1:00 p.m. local time, unless adjourned or postponed to a later date or time.

Purposes of the Marvell General Meeting

At the Marvell general meeting, Marvell shareholders will be asked to consider and vote on the following proposals:

A copy of the Merger Agreement is attached to this joint proxy statement/prospectus as Annex A. Marvell shareholders are encouraged to read the Merger Agreement in its entirety.

THE MATTERS TO BE CONSIDERED AT THE MARVELL GENERAL MEETING ARE OF GREAT IMPORTANCE TO MARVELL SHAREHOLDERS. ACCORDINGLY, MARVELL SHAREHOLDERS ARE URGED TO READ AND CAREFULLY CONSIDER THE INFORMATION PRESENTED IN THIS JOINT PROXY STATEMENT/PROSPECTUS, AND TO COMPLETE, DATE, SIGN AND PROMPTLY RETURN THE ENCLOSED PROXY CARD(S) IN THE ENCLOSED, PRE-ADDRESSED, POSTAGE-PAID ENVELOPE.

The Marvell board of directors unanimously recommends that Marvell shareholders vote “FOR” the approval of Marvell Share Issuance and “FOR” the Marvell Adjournment Proposal.

Record Date; Issued Shares; Shares Entitled to Vote

The record date for the Marvell general meeting is February 2, 2018. This means that you must be a shareholder of record of Marvell common shares at the close of business on February 2, 2018, in order to vote at the Marvell general meeting. You are entitled to one vote for each Marvell common share you own. At the close of business on the Marvell record date, there were 495,909,755 Marvell common shares issued and entitled to vote, held by approximately 418 holders of record.

Quorum and Vote Required

A quorum of Marvell shareholders is required to transact business at the Marvell general meeting. A quorum for the Marvell general meeting is the presence of holders representing in person or by proxy in excess of 50% of the total issued voting shares of Marvell throughout the Marvell general meeting. Abstentions and broker non-votes are counted for the purpose of determining the presence or absence of a quorum. Marvell’s transfer agent, American

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Stock Transfer and Trust Company, will act as inspector of elections at the Marvell general meeting and will ascertain whether a quorum is present, tabulate the votes and determine the voting results on all matters presented to the Marvell shareholders at the Marvell general meeting. If a quorum is not present, the Marvell general meeting will stand adjourned as may be determined by Marvell’s board of directors in accordance with its Bye-laws in order to permit the further solicitation of proxies or votes. At any subsequent reconvening of the Marvell general meeting, all proxies will be voted in the same manner as the proxies would have been voted at the original convening of the Marvell general meeting, except for any proxies that have been effectively revoked or withdrawn prior to the reconvening of the Marvell general meeting.

For shares held in “street name,” your bank, broker or other nominee will not be permitted to vote at the Marvell general meeting without specific instructions as to how to vote from you as the beneficial owner of Marvell common shares. Broker non-votes will be entirely excluded from the vote and will have no effect on the vote on the Marvell Share Issuance or the Marvell Adjournment Proposal.

Share Ownership and Voting by Marvell’s Directors and Executive Officers

At the close of business on the record date for the Marvell general meeting, Marvell’s directors and executive officers had the right to vote approximately 34,168,030 Marvell common shares at the Marvell general meeting, collectively representing approximately 6.9% of Marvell common shares issued and entitled to vote on that date. We currently expect that Marvell’s directors and executive officers will vote their shares “FOR” the approval of the Marvell Share Issuance and “FOR” the Marvell Adjournment Proposal.

How to Vote

You may vote your Marvell common shares in person at the Marvell general meeting or by submitting a proxy (including proxies received by telephone or over the Internet). Marvell recommends that you submit your proxy even if you plan to attend the Marvell general meeting. If you submit your proxy, you may change your vote if you attend and vote at the Marvell general meeting. However, mere attendance at the Marvell general meeting will not automatically revoke your previously submitted proxy.

Owners of record (that is, shareholders of record who hold Marvell common shares in their own name, as opposed to through a bank, broker or other nominee), as of the close of business on the Marvell record date, may vote in person at the Marvell general meeting or by proxy. This means that you may use the enclosed proxy card(s) to instruct the persons named as proxies how to vote your shares. If you properly complete, sign and date your proxy card(s) or submit your voting instructions by telephone or over the Internet, your shares will be voted in accordance with your instructions. The named proxies will vote all shares at the Marvell general meeting for

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which proxies have been properly submitted (whether by mail, telephone or over the Internet) and not revoked. Owners of record have three ways to vote by proxy:

If you sign and return your proxy card(s) but do not mark your card(s) to instruct the proxies how to vote your shares on each proposal, your shares will be voted as recommended by the Marvell board of directors.

The deadline for voting electronically through the Internet or by telephone is 11:59 p.m. Eastern time on March 15, 2018.

Shares Held in “Street Name”

Marvell shareholders who hold Marvell common shares in a stock brokerage account or through a bank, broker or other nominee (“street name” shareholders) who wish to vote at the Marvell general meeting should be provided a voting instruction form by the institution that holds their shares. If this has not occurred, contact the institution that holds your shares.

A number of banks and brokerage firms participate in a program that also permits shareholders whose shares are held in “street name” to direct their vote by telephone or over the Internet. If your common shares are held in an account at a bank or brokerage firm that participates in such a program, you may direct the vote of these shares by telephone or over the Internet by following the voting instructions enclosed with the proxy form from the bank or brokerage firm. The Internet and telephone proxy procedures are designed to authenticate shareholders’ identities, to allow shareholders to give their proxy voting instructions and to confirm that those instructions have been properly recorded. Generally, votes directed by telephone or over the Internet through such a program must be received by 11:59 p.m. Eastern time on March 15, 2018. However, please follow the instructions included on the voting instruction form. Directing the voting of your shares will not affect your right to vote in person if you decide to attend the Marvell general meeting; however, you must first obtain a signed and properly executed legal proxy from your bank, broker or other nominee to vote your shares held in “street name” at the Marvell general meeting. Requesting a legal proxy prior to the deadline described above will automatically cancel any voting directions you have previously given by telephone or over the Internet with respect to your shares.

With respect to the approval of the Marvell Share Issuance and the Marvell Adjournment Proposal, for shares held in “street name,” if you do not instruct your bank, broker or other nominee how to vote your shares, your bank, broker or other nominee will not be authorized to vote, and will not vote your shares. This will have no effect on the outcome of the vote on the approval of the Marvell Share Issuance or the Marvell Adjournment Proposal.

If you abstain from voting with respect to the approval of the Marvell Share Issuance or the Marvell Adjournment Proposal, your abstention will be entirely excluded from the vote and will have no effect on the outcome of the vote on the approval of the Marvell Share Issuance or the Marvell Adjournment Proposal.

If you do not vote your shares, either in person at the Marvell general meeting or by proxy, your failure to vote will have no effect on the outcome of the vote on the approval of the Marvell Share Issuance or the Marvell Adjournment Proposal.

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Revoking Your Proxy

If you are the owner of record as of the close of business on the Marvell record date, you may change or revoke your proxy at any time before it is voted at the Marvell general meeting by: