X0508 4 2026-01-23 0001437402 ARDELYX, INC. ARDX 0002088887 Brady James Parker C/O ARDELYX, INC. 400 FIFTH AVENUE, SUITE 210 WALTHAM MA 02451 true Chief Human Resources Officer false Common Stock 2026-01-23 4 A 0 99455 0 A 265455 D Stock Option (Right to Buy) 7.77 2026-01-23 4 A 0 149185 0 A 2036-01-23 Common Stock 149185 149185 D Restricted stock units ("RSUs"). The Reporting Person is entitled to receive one (1) shares of Common Stock for each one (1) RSU upon the vesting thereof. The option becomes exercisable as it vests and the shares subject to the option vest in 48 successive, equal monthly installments on each monthly anniversary of January 23, 2026, 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 James Parker Brady 2026-01-26