0001437402 2021-11-12 2021-11-12 0001437402 false 8-K 2021-11-12 ARDELYX, INC. DE 001-36485 26-1303944 400 FIFTH AVE. SUITE 210 WALTHAM MA 02451 510 745-1700 false false false false Common Stock, par value $0.0001 ARDX NASDAQ false