Gigamon (GIMO) DEFA14A Additional proxy soliciting materials

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

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-11(c) or §240.14a-2

GIGAMON INC.

(Name of Registrant as Specified In Its Charter)

Payment of Filing Fee (Check the appropriate box):

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Important Notice of Availability of Proxy Materials for the Shareholder Meeting of

GIGAMON INC.

To Be Held On:

June 12, 2014 at 1:00 p.m.

3300 Olcott Street, Santa Clara, California 95054

COMPANY NUMBER

ACCOUNT NUMBER

CONTROL NUMBER

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting.

If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before June 2, 2014.

Please visit http://www.astproxyportal.com/ast/18362, where the following materials are available for view:

		• Notice of Annual Meeting of Stockholders • Proxy Statement • Form of Electronic Proxy Card • Annual Report on Form 10-K
TO REQUEST MATERIAL:		TELEPHONE: 888-Proxy-NA (888-776-9962) 718-921-8562 (for international callers) E-MAIL: info@amstock.com WEBSITE: http://www.amstock.com/proxyservices/requestmaterials.asp
TO VOTE:		ONLINE: To access your online proxy card, please visitwww.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at www.voteproxy.com up until 11:59 PM Eastern Time the day before the cut-off or meeting date. IN PERSON: You may vote your shares in person by attending the Annual Meeting. TELEPHONE: To vote by telephone, please visithttps://secure.amstock.com/voteproxy/login2.asp to view the materials and to obtain the toll free number to call. MAIL: You may request a card by following the instructions above.

1. Election of two Class I directors:     NOMINEES:		2.	To ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for our fiscal year ending December 27, 2014.
	Michael C. Ruettgers                              Paul J. Milbury	3.	To transact such other business as may properly come before the meeting or any adjournments or postponements thereof.
		In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Annual Meeting. This proxy when properly executed will be voted as directed herein by the undersigned Stockholder.If no direction is made, this proxy will be voted “FOR ALL NOMINEES” in Proposal 1 and “FOR” Proposal 2.
Please note that you cannot use this notice to vote by mail.