UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A INFORMATION
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	
THE RUBICON PROJECT, INC.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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Important Notice of Availability of Proxy Materials for the Annual Meeting of Stockholders of
rubicon
PROJECT
TO BE HELD ON:
Thursday, May 26, 2016 at 12:00 p.m., Pacific Time
at 12181 Bluff Creek Drive, 4th Floor, Los Angeles, California 90094
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 May 16, 2016.
Please visit http://www.astproxyportal.com/ast/18899/, 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 meeting date.
IN PERSON: You may vote your shares in person by attending the Annual Meeting.
TELEPHONE: To vote by telephone, please visit www.voteproxy.com 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 Directors:
Sumant Mandal
Robert F. Spillane
2. To ratify the selection of PricewaterhouseCoopers LLP as the company’s independent registered public accounting firm for the current fiscal year.
3. To transact such other business as may properly come before the meeting or any postponements or adjournments thereof.
THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF DIRECTORS AND “FOR” PROPOSAL 2.
Please note that you cannot use this notice to vote by mail.