DATED NOVEMBER 5, 2015

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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¨ Preliminary Proxy Statement

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¨ Definitive Proxy Statement

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¨ Soliciting Materials under § 240.14a-12

PERICOM SEMICONDUCTOR CORPORATION

(Name of Registrant as Specified in its Charter)

MONTAGE TECHNOLOGY GROUP LIMITED

PORSCHE ACQUISITION SUB, INC.

HOWARD YANG

STEPHEN TAI

MARK VOLL

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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On November 5, 2015, Montage issued the following press release:

FOR IMMEDIATE RELEASE

Montage Technology Group Files Supplemental Investor Presentation Regarding its Superior Offer to Acquire Pericom Semiconductor

Underscores Financing Certainty and Lack of Regulatory Risk

Montage Urges Pericom Shareholders to Vote AGAINST the Diodes Acquisition Proposal on the GOLD Proxy Card

MILPITAS, CA, November 5, 2015 — Montage Technology Group Limited (“Montage”) today filed a supplemental investor presentation with the Securities and Exchange Commission in connection with its superior offer to acquire Pericom Semiconductor Corporation (“Pericom”) (NASDAQ: PSEM). The presentation, which highlights Montage’s confidence and ability to close the Pericom-Montage transaction, as well as certain factually inaccurate and misleading statements made by Pericom about Montage’s offer, will also be available on Montage’s website at www.montage-tech.com.

Montage believes that its $18.50 per share cash offer is clearly superior to the $17.00 per share Diodes Incorporated (“Diodes”) proposal and presents a compelling opportunity to create substantial value for all Pericom shareholders. Montage’s $18.50 offer is 9% higher than the Diodes proposal and 52% higher than Pericom’s unaffected closing price on September 2, 2015.

SHAREHOLDERS ARE URGED TO PROTECT THEIR INVESTMENT BY VOTING THE GOLD PROXY CARD TODAY!

Pericom’s special meeting is fast approaching. Montage urges Pericom shareholders to Vote “AGAINST” the Diodes Acquisition Proposal on the GOLD proxy card TODAY.

EVERY VOTE IS IMPORTANT, NO MATTER HOW MANY OR HOW FEW SHARES.

Shareholders who have questions or need assistance voting their shares may contact:

INNISFREE M&A INCORPORATED

+ (888) 750-5834 (toll-free from the US and Canada)

+ (412) 412-232-3651 (from other countries)

Remember—only the latest-dated proxy card counts!

Barclays is acting as financial advisor to Montage and O’Melveny & Myers LLP is serving as legal counsel.

Montage and its directors, executive officers and certain employees may be deemed, under rules of the Securities and Exchange Commission (“SEC”), to be participants in the solicitation of proxies from Pericom shareholders in connection with Pericom’s Special Meeting of Shareholders. Information about the interests in Pericom of Montage and its directors, executive officers and employees are set forth in a definitive proxy statement that was filed with the SEC on October 26, 2015 (the “Montage Proxy”).

Investors are urged to read in its entirety the Montage Proxy which is available now and any other relevant documents filed with the SEC when they become available, because they contain (or will contain) important information. The Montage Proxy, and any other documents filed by Montage with the SEC, may be obtained free of charge at the SEC web site at www.sec.gov. The Montage Proxy and such other documents may also be obtained free of charge by contacting Innisfree M&A Incorporated, Montage’s proxy solicitor, toll-free at: (888) 750-5834 or 501 Madison Avenue, 20th Floor, New York, New York 10022.

About Montage

Montage is a global fabless provider of analog and mixed-signal semiconductor solutions currently addressing the home entertainment and cloud computing markets. In the home entertainment market, Montage’s technology platform enables the Company to design highly integrated end-to-end solutions with customized software for set-top boxes. These solutions optimize signal processing performance under demanding operating conditions typically found in emerging marketing environments. In the cloud computing market, Montage offers high performance, low power memory interface solutions that enable memory intensive server applications. Its technology platform approach allows Montage to provide integrated solutions that meet the expanding needs of customers through continuous innovation, efficient design and rapid product development. For more information regarding Montage please visit the Company’s website at www.montage-tech.com.

Company Contact:

Montage

Mark Voll, CFO

(408) 982-2780 or 86-21-6128-5678 x8618

Investor Contact:

Innisfree M&A Incorporated

Arthur Crozier/Jennifer Shotwell/Jon Salzberger

(212) 750-5833

Media Contact:

Joele Frank, Wilkinson Brimmer Katcher

Eric Brielmann or Jed Repko

(415) 869-3950

Mahmoud Siddig

(212) 355-4449