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  ¨
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 under §240.14a-12	
Ardelyx, 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.	
 	 	
¨	 	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.	
 	 	 	
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 	 	(2)	 	Aggregate number of securities to which transaction applies:

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¨	 	Fee paid previously with preliminary materials.	
 	 	
¨	 	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.	
 	 	 	
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Important Notice of Availability of Proxy Materials for the Stockholder Meeting of
ARDELYX, INC.
To Be Held On: June 11, 2015 at 8:30 am local time at 34175 Ardenwood Blvd., Suite 200, Fremont, California
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. T O  facilitate timely delivery please make the request as instructed below before 06/01/15.
Please visit http://www.astproxyportal.com/ast/19476/, 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:
TO VOTE: 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 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 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. To elect two Class 1 directors to hold office until the 2018 Annual Meeting of Stockholders and until their successors are elected and qualified.
NOMINEES:
Annalisa Jenkins, MMBS, MRCP Peter Schultz, Ph.D.
2. To ratify the selection, by the Audit Committee of our Board of Directors, of Ernst & Young, LLP as the independent registered public accounting firm of the Company for the fiscal year ended December 31, 2015.
3. To transact any other business as may properly be presented at the Annual Meeting or any adjournment or postponement thereof
These items of business are more fully described in the proxy statement. The record date for the Annual Meeting is April 21, 2015. Only stockholders of record at the close of business on that date may vote at the meeting or any adjournment thereof.
Please note that you cannot use this notice to vote by mail.