PLX Technology (PLXT) DEFA14A Additional proxy soliciting materials

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

PLX TECHNOLOGY, INC.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Copies to:

Stephen J. Schrader, Esq. Baker & MacKenzie LLP Two Embarcadero Center, 11th Floor San Francisco, CA 94111 (415) 576-3000 Keith E. Gottfried, Esq. Alston & Bird LLP 950 F. Street, N.W. Washington, DC 20004-1404 (202) 239-3679

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PLX Technology, Inc., a Delaware corporation (“PLX Technology” or the “Company”), is filing materials contained in this Schedule 14A with the U.S. Securities and Exchange Commission (“SEC”) in connection with the solicitation of proxies from its stockholders in connection with its 2013 Annual Meeting of Stockholders to be held on December 18, 2013 and at any and all adjournments or postponements thereof (the “2013 Annual Meeting”). In connection with its 2013 Annual Meeting, PLX Technology has filed a definitive proxy statement and a WHITE proxy card with the SEC on November 8, 2013, and has commenced the mailing of a definitive proxy statement and WHITE proxy card to its stockholders.

Notice to Participants in the Company’s Employee Stock Ownership Plan (“ESOP”) Mailed on November 19, 2013

Attached hereto is a copy of the Company’s notice sent to participants in the Company’s ESOP, mailed on November 19, 2013, in connection with the 2013 Annual Meeting. The notice updates the voting procedures of the ESOP shares.  This notice does not change the voting procedures for any stockholders other than ESOP participants.

Additional Information and Where to Find It

PLX Technology, its directors and certain of its executive officers and employees are deemed to be participants in the solicitation of proxies from PLX Technology’s stockholders in connection with the 2013 Annual Meeting. PLX Technology has filed a definitive proxy statement (the “PLX Proxy Statement”) and a WHITE proxy card with the SEC on November 8, 2013, and has commenced the mailing of a definitive proxy statement and WHITE proxy card to its stockholders, in connection with the solicitation of proxies for the 2013 Annual Meeting. STOCKHOLDERS ARE URGED TO READ THE PLX PROXY STATEMENT (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS THAT PLX TECHNOLOGY WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Additional information regarding the identity of these participants and their direct or indirect interests, by security holdings or otherwise, is set forth in the PLX Proxy Statement. To the extent holdings of PLX Technology’s securities have changed since the amounts shown in the PLX Proxy Statement, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC.

Stockholders can obtain, free of charge, copies of the PLX Proxy Statement and any other documents filed by PLX Technology with the SEC in connection with the 2013 Annual Meeting at the SEC’s website (www.sec.gov), at PLX Technology’s website (www. plxtech.com) or by writing to Company’s investor relations department at 870 W. Maude Avenue, Sunnyvale, California 94085. In addition, copies of the proxy materials may be requested from PLX Technology’s proxy solicitor, MacKenzie Partners, Inc., 105 Madison Avenue, New York, NY 10016 or toll-free at (800) 322-2885.

How will shares in the PLX Technology, Inc. Employee Stock Ownership Plan (the “ESOP”) be voted?

As of the close of business on November 11, 2013, the PLX Technology, Inc. Employee Stock Ownership Plan (the “ESOP”) held 325,010 shares of Common Stock.  ESOP participants may direct the voting of shares allocated to their accounts under the ESOP.  As of the close of business on November 11, 2013, 276,360 shares of Common Stock have been allocated to participants under the ESOP.

You will receive with this proxy statement a WHITE voting instruction form (“VIF”) for your shares and a return envelope for that VIF addressed to Mediant Communications.  ESOP shares cannot be voted until either a signed VIF is returned, or voting instructions are submitted by using the Internet or by calling a specifically designated telephone number, which is provided in the VIF.  Your voting instructions will be received and tabulated by American Election Services, LLC (“AES”).  The results will be sent from AES to the ESOP trustee, who will maintain the confidentiality of your personal voting instructions.  The ESOP trustee will certify the totals to the Company for the purpose of having those shares voted.  The ESOP trustee will vote the ESOP shares which are unallocated as of the Record Date and all allocated shares under the ESOP for which no timely voting direction is received in the same proportion as the number of shares of Common Stock for which the trustee has received voting directions for each proposal.

Additional Information and Where to Find It

PLX Technology, its directors and certain of its executive officers and employees are deemed to be participants in the solicitation of proxies from PLX Technology’s stockholders in connection with the 2013 Annual Meeting. PLX Technology has filed a definitive proxy statement (the “PLX Proxy Statement”) and a WHITE proxy card with the SEC on November 8, 2013, and has commenced the mailing of a definitive proxy statement and WHITE proxy card to its stockholders, in connection with the solicitation of proxies for the 2013 Annual Meeting. STOCKHOLDERS ARE URGED TO READ THE PLX PROXY STATEMENT (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS THAT PLX TECHNOLOGY WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Additional information regarding the identity of these participants and their direct or indirect interests, by security holdings or otherwise, is set forth in the PLX Proxy Statement. To the extent holdings of PLX Technology’s securities have changed since the amounts shown in the PLX Proxy Statement, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC.

Stockholders can obtain, free of charge, copies of the PLX Proxy Statement and any other documents filed by PLX Technology with the SEC in connection with the 2013 Annual Meeting at the SEC’s website (www.sec.gov), at PLX Technology’s website (www. plxtech.com) or by writing to Company’s investor relations department at 870 W. Maude Avenue, Sunnyvale, California 94085. In addition, copies of the proxy materials may be requested from PLX Technology’s proxy solicitor, MacKenzie Partners, Inc., 105 Madison Avenue, New York, NY 10016 or toll-free at (800) 322-2885.