UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No.  )

Filed by the Registrant   o

Filed by a Party other than the Registrant   x

Check the appropriate box:

o           Preliminary Proxy Statement

¨           Confidential, for Use of the Commission Only (as permitted by Rule14a-6(e)(2))

¨           Definitive Proxy Statement

x          Definitive Additional Materials

o           Soliciting Material Under Rule 14a-12

PLX TECHNOLOGY, INC.

(Name of Registrant as Specified in Its Charter)

POTOMAC CAPITAL PARTNERS II, L.P.

POTOMAC CAPITAL MANAGEMENT II, L.L.C.

POTOMAC CAPITAL PARTNERS III, L.P.

POTOMAC CAPITAL MANAGEMENT III, L.L.C.

POTOMAC CAPITAL PARTNERS L.P.

POTOMAC CAPITAL MANAGEMENT, L.L.C.

PAUL J. SOLIT

ERIC B. SINGER

MARTIN COLOMBATTO

STEPHEN DOMENIK

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

Payment of Filing Fee (Check the appropriate box):

x          No fee required.

¨           Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)           Title of each class of securities to which transaction applies:

(2)           Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4)           Proposed maximum aggregate value of transaction:

(5)           Total fee paid:

¨           Fee paid previously with preliminary materials:

¨           Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously.  Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.

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(4)           Date Filed:

Potomac Capital Partners II, L.P., together with the other Participants named herein (collectively, “Potomac”), is filing materials contained in this Schedule 14A with the Securities and Exchange Commission (the “SEC”) in connection with the solicitation of proxies for the election of its slate of director nominees at the 2013 annual meeting of stockholders (the “Annual Meeting”) of PLX Technology, Inc.  Potomac has made a definitive filing with the SEC of a proxy statement and an accompanying GOLD proxy card in connection with the Annual Meeting.

On November 26, 2013, Potomac issued an addendum to its investor presentation, which is attached as Exhibit 1 hereto.