SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Rosenbaum David P. (Last) (First) (Middle) C/O ARDELYX, INC. 34175 ARDENWOOD BLVD, SUITE 200 (Street) FREMONT CA 94555 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol ARDELYX, INC. [ ARDX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Chief Development Officer
	3. Date of Earliest Transaction (Month/Day/Year) 07/26/2018
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/26/2018		A		100,000(1)	A	$0.00	168,555(2)	D
Common Stock	07/26/2018		A		10,000(1)	A	$0.00	17,045(3)	I	See Footnote(4)
Common Stock								77,592	I	See Footnote(5)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$4.3	07/26/2018		A		54,730		(6)	07/26/2028	Common Stock	54,730	$0.00	54,730	D
Stock Option (Right to Buy)	$4.3	07/26/2018		A		8,220		(6)	07/26/2028	Common Stock	8,220	$0.00	8,220	I	See Footnote(4)

Explanation of Responses:

1. Restricted stock units ("RSUs"). The Reporting Person is entitled to receive one (1) share of Common Stock for each one (1) RSU upon the vesting thereof.

2. Includes 1,644 shares acquired under the Issuer's Employee Stock Purchase Plan (the "ESPP") on February 28, 2018.

3. Includes 3,000 shares acquired by the Reporting Person's spouse under the ESPP on February 28, 2018.

4. The shares are directly held by the Reporting Person's wife.

5. The shares are directly held by David Paul Rosenbaum and Susan Edelstein Rosenbaum, Trustees of the David Paul Rosenbaum Family Trust.

6. The option becomes exercisable as it vests and the shares subject to the option vest with respect to 1/48 of the shares subject thereto on each monthly anniversary of July 26, 2018, subject to the Reporting Person's continued employment or service relationship with the Issuer on each such vesting date.

	/s/ Elizabeth Grammer, Attorney-in-Fact for David Rosenbaum	07/30/2018
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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