Ardelyx Officer Power of Attorney and Stock Holdings Disclosure

This SEC Form 3 filing discloses the initial beneficial ownership of Ardelyx, Inc. securities by Rajani Dinavahi, the company's Chief Medical Officer. The filing includes a power of attorney document executed on March 16, 2026, granting authority to company executives to file various SEC forms on Dinavahi's behalf. Dinavahi holds 201,000 shares of common stock through restricted stock units and has been granted a stock option for 301,000 additional shares at an exercise price of $6.11 per share, expiring April 1, 2036. The option vests over time, with 25% vesting on April 1, 2027, and the remainder in 36 monthly installments. The power of attorney authorizes designated company officers to file Forms 3, 4, 5, Schedules 13D/13G, Form 144, and Form ID on Dinavahi's behalf, superseding any previous powers of attorney.