Exhibit 99.1

Marvell Technology Group Ltd. Reports Fourth Fiscal Quarter and Fiscal

Year 2013 Financial Results

Santa Clara, Calif. (February 21, 2013) — Marvell Technology Group Ltd. (NASDAQ: MRVL), a global leader in integrated silicon solutions, today reported financial results for the fourth fiscal quarter and fiscal year 2013, ended February 2, 2013.

Key Fourth Quarter of Fiscal 2013 and Fiscal Year 2013 Financial Highlights

First Quarter of Fiscal 2014 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 February 2, 2013.

Fourth Quarter of Fiscal 2013 and Fiscal Year 2013 Summary

Revenue for the fourth quarter of fiscal 2013 was $775 million, a 1 percent sequential decrease from $781 million in the third quarter of fiscal 2013, ended October 27, 2012, and a 4 percent increase from revenue of $743 million in the fourth quarter of fiscal 2012, ended January 28, 2012.

For the fiscal year ended February 2, 2013, revenue was $3.17 billion, a decrease of 7 percent from revenue of $3.39 billion for the fiscal year ended January 28, 2012.

GAAP net income for the fourth quarter of fiscal 2013 was $50 million, or $0.09 per share (diluted), compared with GAAP net income of $69 million, or $0.12 per share (diluted), for the third quarter of fiscal 2013, and $81 million, or $0.13 per share (diluted), for the fourth quarter of fiscal 2012.

For the year ended February 2, 2013, GAAP net income was $307 million, or $0.54 per share (diluted), compared with GAAP net income of $615 million, or $0.99 per share (diluted), for the year ended January 28, 2012.

Non-GAAP net income was $104 million, or $0.19 per share (diluted), for the fourth quarter of fiscal 2013, compared with non-GAAP net income of $113 million, or $0.20 per share (diluted), for the third quarter of fiscal 2013 and $127 million, or $0.21 per share (diluted), for the fourth quarter of fiscal 2012.

For the fiscal year ended February 2, 2013, non-GAAP net income was $498 million, or $0.86 per share (diluted), compared with non-GAAP net income of $795 million, or $1.27 per share (diluted) for the fiscal year ended January 28, 2012.

“Fiscal year 2013 was a disappointing year for Marvell. Industry hard disk drive unit shipments declined for the year offsetting share gains, the networking end market was relatively flat and we endured a product transition in Mobile. Despite the revenue decline, Marvell remained profitable and generated $626 million in free cash flow while simultaneously continuing investments in several key initiatives,” said Dr. Sehat Sutardja, Marvell’s Chairman and Chief Executive Officer. “We expect many of our investments and key initiatives to produce tangible results in the new fiscal year across all of our served end markets. These include continued share gains in HDDs, strong growth and share gains in SSDs and hybrids, above market growth in networking, increased traction for our connectivity products and a resumption of growth in our mobile business.”

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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 February 2, 2013, October 27, 2012 and January 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 fourth quarter of fiscal 2013 was 52.2 percent, compared to 52.0 percent for the third quarter of fiscal 2013 and 54.1 percent for the fourth quarter of fiscal 2012. GAAP gross margin for fiscal year 2013 was 52.9 percent compared to 56.8 percent for fiscal year 2012.

Non-GAAP gross margin for the fourth quarter of fiscal 2013 was 53.2 percent, compared to 52.3 percent for the third quarter of fiscal 2013 and 54.5 percent for the fourth quarter of fiscal 2012. Non-GAAP gross margin for fiscal year 2013 was 53.4 percent compared to 57.0 percent for fiscal year 2012.

Shares used to compute GAAP net income per diluted share for the fourth quarter of fiscal 2013 were 528 million shares, compared with 559 million shares in the third quarter of fiscal 2013 and 599 million shares in the fourth quarter of fiscal 2012. Shares used to compute GAAP net income per diluted share for fiscal year 2013 were 563 million shares as compared with 623 million shares for fiscal year 2012.

Shares used to compute non-GAAP net income per diluted share for the fourth quarter of fiscal 2013 were 544 million shares, compared with 578 million shares for the third quarter of fiscal 2013 and 606 million shares for the fourth quarter of fiscal 2012. Shares used to compute non-GAAP net income per diluted share for fiscal year 2013 were 579 million shares as compared with 627 million shares for fiscal year 2012. 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.

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Cash flow from operations for the fourth quarter of fiscal 2013 was $205 million, compared to the $137 million reported in the third quarter of fiscal 2013 and the $69 million reported in the fourth quarter of fiscal 2012. Free cash flow for the fourth quarter of fiscal 2013 was $161 million, compared to the $113 million reported in the third quarter of fiscal 2013 and the $38 million reported in the fourth quarter of fiscal 2012. Free cash flow as presented above is defined as cash flow from operations, less capital expenditures and purchases of IP licenses.

Under the share repurchase program, Marvell repurchased approximately 34 million shares for a total of $283 million in the fourth quarter of fiscal 2013. Over the past ten quarters, Marvell has repurchased and retired approximately 184 million shares, or about 27 percent, of its outstanding shares.

Marvell also paid a quarterly dividend of $0.06 per share on December 21, 2012 to all shareholders of record as of December 13, 2012. Marvell intends to pay its next quarterly dividend of $0.06 per share on April 4, 2013 to all shareholders of record as of March 14, 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.

Conference Call

Marvell will be conducting a conference call on Thursday, February 21, 2013 at 1:45 p.m. Pacific Time to discuss results for the fourth fiscal quarter and fiscal year 2013. Interested parties may join the conference call by dialing 1-866-788-0541 or 1-857-350-1679, pass-code 61639137. 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 March 21, 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

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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.

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.

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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 new investments and key initiatives producing tangible results in the new fiscal year across all served end markets; expectations regarding share gains in HDD’s, strong growth and share gains in SSDs and hybrids, and growth in network, connectivity products and Marvell’s mobile business; 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 net income and net income per share as important supplemental information; and statement relating to its financial outlook for the first 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; any costs and liabilities relating to the outcome of 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; ability to generate cash flows; and other risks detailed in Marvell’s SEC filings from time to time. When Marvell files its Annual Report on Form 10-K for the year ended February 2, 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 Quarterly Report on Form 10-Q for the quarter ended October 27, 2012 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)

Marvell Technology Group Ltd.

Condensed Consolidated Balance Sheets

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(In thousands)

Marvell Technology Group Ltd.

Condensed Consolidated Statements of Cash Flows

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(in thousands)

Marvell Technology Group Ltd.

Reconciliations from GAAP to Non-GAAP

(Unaudited)

(In thousands, except per share amounts)

Marvell Technology Group Ltd.

Reconciliations from GAAP to Non-GAAP Outlook

(Unaudited)

(In millions, except per share amounts)