Definitive Additional 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 (AMENDMENT NO.     )

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-12
PALO ALTO NETWORKS, INC.
(Name of Registrant as Specified In Its Charter)
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*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on December 12, 2012.

PALO ALTO NETWORKS, INC.

paloalto NETWORKS

PALO ALTO NETWORKS, INC.

3300 OLCOTT STREET SANTA CLARA, CA 95054

Meeting Information

Meeting Type: Annual Meeting

For holders as of: October 15, 2012

Date: December 12, 2012 Time: 1:00 p.m. Pacific Time

Location: 3300 Olcott Street

Santa Clara, CA 95054

You are receiving this communication because you hold shares in the company named above.

This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).

We encourage you to access and review all of the important information contained in the proxy materials before voting.

See the reverse side of this notice to obtain proxy materials and voting instructions.

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Before You Vote

How to Access the Proxy Materials

Proxy Materials Available to VIEW or RECEIVE:

ANNUAL REPORT TO STOCKHOLDERS AND PROXY STATEMENT

How to View Online:

Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com.

How to Request and Receive a PAPER or E-MAIL Copy:

If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:

1) BY INTERNET: www.proxyvote.com

2) BY TELEPHONE: 1-800-579-1639

3) BY E-MAIL*: sendmaterial@proxyvote.com

* If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) in the subject line.

Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before November 28, 2012 to facilitate timely delivery.

How To Vote

Please Choose One of the Following Voting Methods

Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.

Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) available and follow the instructions.

Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

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Voting Items

The Board of Directors recommends you vote FOR the following proposals:

1. Election of Directors

Nominees:

1a. John M. Donovan

1b. Nir Zuk

2. To ratify the appointment of Ernst & Young LLP as Palo Alto Networks’ independent registered public accounting firm for its fiscal year ending July 31, 2013.

3. Advisory vote on executive compensation.

The Board of Directors recommends you vote 1 year on the following proposal:

4. Advisory vote on the frequency of future advisory votes on executive compensation.

NOTE: Such other business as may properly come before the meeting or any adjournment thereof.

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