Sigma Designs (SIGM) DEFA14A Additional proxy soliciting materials

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  o

Check the appropriate box:

o Preliminary Proxy Statement

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

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material under §240.14a-12

Sigma Designs, Inc.

(Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

x No fee required.

o 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:

o Fee paid previously with preliminary materials.

o 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.

(1) Amount Previously Paid:

(2) Form, Schedule or Registration Statement No.:

(3) Filing Party:

(4) Date Filed:

Explanatory Note:

Sigma Designs, Inc. (the “Company”) is filing the attached materials set forth as Exhibit 1 (the “Additional Materials”) to this Schedule 14A with the Securities and Exchange Commission (the “SEC”) in connection with the solicitation of proxies for the election of the Company’s slate of director nominees at the Company’s 2012 annual meeting of shareholders (the “Annual Meeting”).  On June 19, 2012, the Company filed a definitive proxy statement with the SEC with regard to the Annual Meeting.  The definitive proxy statement contains important information concerning the identity and interests of Sigma Designs’ directors, director nominees and certain of its officers and employees that may be deemed, along with Sigma Designs, to be participants in the solicitation of Sigma Designs’ shareholders in connection with the 2012 Annual Meeting.

Copies of Sigma Designs’ definitive proxy statement, any other relevant documents and other materials filed with the SEC concerning Sigma Designs, when filed, may be obtained free of charge at www.sec.gov and www.sigmadesigns.com/IR.The definitive proxy statement and any other relevant documents filed with the SEC contain (or will contain) important information, and shareholders should carefully read the definitive proxy statement, the accompanying WHITE proxy card and other materials filed with the SEC when they become available before making any voting decision.

On July 20, 2012, the Company provided the Additional Materials to Institutional Shareholder Services.

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