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  ¨

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¨ 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

BARRACUDA NETWORKS, INC.

(Name of Registrant as Specified In Its Charter)

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

BARRACUDA NETWORKS, INC.

To Be Held On: July 22, 2014 at 1:00 p.m. at 3175 S. Winchester Blvd., Campbell, CA 95008

COMPANY NUMBER

JOHN SMITH 1234 MAIN STREET

ACCOUNT NUMBER

APT. 203

NEW YORK, NY 10038

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 7/11/14.

Please visit http://www.astproxyportal.com/ast/18596/, 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 visit www.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 visit https://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. To elect the following Class I Director Nominees

2. To ratify the appointment of Ernst & Young LLP as Barracuda Networks independent registered public accounting firm for the fiscal year ending February 28, 2015.

NOMINEES:

William D. Jenkins, Jr. Zachary S. Levow

NOTE: The proxies are authorized to vote on such other business as may properly come before the meeting or any adjournment thereof.

Please note that you cannot use this notice to vote by mail.