Exhibit 99.1

Marvell Technology Group Ltd. Reports First Quarter of Fiscal Year 2014

Financial Results

Santa Clara, Calif. (May 23, 2013) — Marvell Technology Group Ltd. (NASDAQ: MRVL), a global leader in integrated silicon solutions, today reported financial results for the first quarter of fiscal year 2014, ended May 4, 2013.

Key 1Q FY2014 Financial Highlights

2Q FY2014 Financial Outlook

Marvell’s financial outlook does not include the potential impact of future share repurchases, pending litigation matters, business combinations, asset acquisitions or other investments that may be completed after May 4, 2013.

1Q FY2014 Summary

Revenue for the first quarter of fiscal 2014 was $734 million, a 5 percent sequential decrease from $775 million in the fourth quarter of fiscal 2013, ended February 2, 2013, and a 8 percent decrease from revenue of $796 million in the first quarter of fiscal 2013, ended April 28, 2012.

GAAP net income for the first quarter of fiscal 2014 was $53 million, or $0.11 per share (diluted), compared with GAAP net income of $50 million, or $0.09 per share (diluted), for the fourth quarter of fiscal 2013, and $95 million, or $0.16 per share (diluted), for the first quarter of fiscal 2013.

Non-GAAP net income was $98 million, or $0.19 per share (diluted), for the first quarter of fiscal 2014, compared with non-GAAP net income of $104 million, or $0.19 per share (diluted), for the fourth quarter of fiscal 2013, and $139 million, or $0.23 per share (diluted), for the first quarter of fiscal 2013.

“Our results in the first quarter were at the high-end of our guidance mainly due to better than normal seasonal demand and share gains in our storage and networking end markets,” said Dr. Sehat Sutardja, Marvell’s Chairman and Chief Executive Officer. “Starting in the second quarter of fiscal 2014, we expect many of our investments and key initiatives across all of our end markets to produce tangible results. More specifically, we expect growth to be driven by increased traction in areas such as mobile handsets, tablets, connectivity and SSDs.”

Marvell reports net income, basic and diluted net income per share, in accordance with U.S. generally accepted accounting principles (GAAP) and on a non-GAAP basis as outlined below. Reconciliations of GAAP net income to non-GAAP net income for the three months ended May 4, 2013, February 2, 2013, and April 28, 2012 appear in the financial statements below. Non-GAAP net income, where applicable, excludes the effect of stock-based compensation, amortization of acquired intangible assets, acquisition-related costs, restructuring costs, and certain one-time expenses and benefits.

GAAP gross margin for the first quarter of fiscal 2014 was 54.3 percent, compared to 52.2 percent for the fourth quarter of fiscal 2013 and 54.0 percent for the first quarter of fiscal 2013.

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Non-GAAP gross margin for the first quarter of fiscal 2014 was 54.6 percent, compared to 53.2 percent for the fourth quarter of fiscal 2013 and 54.5 percent for the first quarter of fiscal 2013.

Shares used to compute GAAP net income per diluted share for the first quarter of fiscal 2014 were 505 million shares, compared with 528 million shares in the fourth quarter of fiscal 2013 and 595 million shares in the first quarter of fiscal 2013. Shares used to compute non-GAAP net income per diluted share for the first quarter of fiscal 2014 were 522 million shares, compared with 544 million shares for the fourth quarter of fiscal 2013 and 606 million shares for the first quarter of fiscal 2013. The decrease in shares used to compute both Marvell’s GAAP and non-GAAP net income per diluted share was primarily due to Marvell’s share repurchase program.

Cash flow from operations for the first quarter of fiscal 2014 was $84 million, compared to the $205 million reported in the fourth quarter of fiscal 2013 and the $199 million reported in the first quarter of fiscal 2013. Free cash flow for the first quarter of fiscal 2014 was $53 million, compared to the $161 million reported in the fourth quarter of fiscal 2013 and the $178 million reported in the first quarter of fiscal 2013. Free cash flow as presented above is defined as cash flow from operations, less capital expenditures and purchases of technology licenses reported under investing and financing activities in the consolidated statement of cash flows.

Under the share repurchase program, Marvell repurchased approximately 20 million shares for a total of $200 million in the first quarter of fiscal 2014. Over the past eleven quarters, Marvell has repurchased and retired approximately 204 million shares, or about 29 percent, of its outstanding shares.

Marvell also paid a quarterly dividend of $0.06 per share on April 4, 2013 to all shareholders of record as of March 14, 2013. Marvell intends to pay its next quarterly dividend of $0.06 per share on July 3, 2013 to all shareholders of record as of June 13, 2013.

The payment of future quarterly cash dividends on Marvell’s common shares is subject to, among other things, the best interests of its shareholders, its results of operations, cash balances and future cash requirements, financial condition, statutory requirements of Bermuda law, and other factors that the board of directors may deem relevant.

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Conference Call

Marvell will be conducting a conference call on Thursday, May 23, 2013 at 1:45 p.m. Pacific Time to discuss results for the first quarter of fiscal 2014. Interested parties may join the conference call by dialing 1-866-318-8611 or 1-617-399-5130, pass-code 64582267. The call will be webcast by Thomson Reuters and can be accessed at the Marvell Investor Relations website at http://investor.marvell.com/ with a replay available following the call until June 23, 2013.

Discussion of Non-GAAP Financial Measures

Non-GAAP financial measures exclude the effect of stock-based compensation expense, amortization of acquired intangible assets, acquisition-related costs, restructuring costs, and certain one-time expenses and benefits that are driven primarily by discrete events that management does not consider to be directly related to Marvell’s core operating performance. Non-GAAP net income per share is calculated by dividing non-GAAP net income by non-GAAP weighted average shares outstanding (diluted). For purposes of calculating non-GAAP net income per share, the GAAP weighted average shares outstanding (diluted) is adjusted to exclude the potential benefits of stock-based compensation expected to be incurred in future periods but not yet recognized in the financial statements. The expected compensation costs are treated as proceeds assumed to be used to repurchase shares under the GAAP treasury stock method and also include the dilutive/anti-dilutive effects of common stock options and restricted stock units.

Marvell believes that the presentation of non-GAAP financial measures provide important supplemental information to management and investors regarding financial and business trends relating to Marvell’s financial condition and results of operations. While Marvell uses non-GAAP financial measures as a tool to enhance its understanding of certain aspects of its financial performance, Marvell does not consider these measures to be a substitute for, or superior to, the information provided by GAAP financial measures. Consistent with this approach, Marvell believes that disclosing non-GAAP financial measures to the readers of its financial statements provides such readers with useful supplemental data that, while not a substitute for GAAP financial measures, allows for greater transparency in the review of its financial and operational performance. For further information regarding why Marvell believes that these non-GAAP measures provide useful information to investors, the specific manner in which management uses these measures, and some of the limitations associated with the use of these measures, please refer to Marvell’s Current Report on Form 8-K filed today with the SEC. The Form 8-K is available on the SEC’s website at www.sec.gov as well as on the Marvell website in the Investor Relations section at www.marvell.com.

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About Marvell

Marvell is a global leader in providing complete silicon solutions enabling the digital connected lifestyle. From mobile communications to storage, cloud infrastructure, digital entertainment and in-home content delivery, Marvell’s diverse product portfolio aligns complete platform designs with industry-leading performance, security, reliability and efficiency. At the core of powerful consumer, network and enterprise systems, Marvell empowers partners and their customers to always stand at the forefront of innovation, performance and mass appeal. By providing people around the world with mobility and ease of access to services adding value to their social, private and work lives, Marvell is committed to enhancing the human experience.

As used in this release, the term “Marvell” refers to Marvell Technology Group Ltd. and its subsidiaries. For more information please visit www.marvell.com.

Forward-Looking Statements under the Private Securities Litigation Reform Act of 1995

This press release contains forward-looking statements that involve risks and uncertainties, including Marvell’s: expectations regarding investments and key initiatives across its end markets producing tangible results starting in the second quarter; expectations regarding increased traction in areas such as mobile handsets, tablets, connectivity and SSDs; statements regarding its dividend program including the declaration of, timing of, funding of and quarterly amount of dividends; statements concerning Marvell’s use of non-GAAP financial measures as important supplemental information; and statements relating to its financial outlook for the second quarter of fiscal 2014. These statements are not guarantees of results and should not be considered as an indication of future activity or future performance. Actual events or results may differ materially from those described in this document due to a number of risks and uncertainties, including, among others, Marvell’s reliance on a few customers for a significant portion of its revenue; costs and liabilities relating to current and future litigation; Marvell’s ability to develop and introduce new and enhanced products in a timely and cost effective manner; uncertainty in the worldwide economic conditions; seasonality in sales of consumer devices in which our products are incorporated; Marvell’s ability to compete in products and prices in an intensely competitive industry; Marvell’s ability to recruit and retain skilled personnel; Marvell’s ability to generate cash flows; and other risks detailed in Marvell’s SEC filings from time to time. When Marvell files its Quarterly Report on Form 10-Q for the quarter ended May 4, 2013, the financial statements may differ from the results disclosed in this press release because judgments and estimates that management used in preparing the financial results reported in this press release may need to be updated to the date of the filing. For other factors that could cause Marvell’s results to vary from expectations, please see the risk factors identified in the Marvell’s latest Annual Report on Form 10-K for the year ended February 2, 2013 as filed with the SEC, and other factors detailed from time to time in Marvell’s filings with the SEC. Marvell undertakes no obligation to revise or update publicly any forward-looking statements.

Marvell^® and the Marvell logo are registered trademarks of Marvell and/or its affiliates.

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Marvell Technology Group Ltd.

Condensed Consolidated Statements of Operations

(Unaudited)

(In thousands, except per share amounts)

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Marvell Technology Group Ltd.

Condensed Consolidated Balance Sheets

(Unaudited)

(In thousands)

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Marvell Technology Group Ltd.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(in thousands)

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Marvell Technology Group Ltd.

Reconciliations from GAAP to Non-GAAP

(Unaudited)

(In thousands, except per share amounts)

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Marvell Technology Group Ltd.

Reconciliations from GAAP to Non-GAAP Outlook

(Unaudited)

(In millions, except per share amounts)

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