X0306 4 2019-06-03 false 0001517022 Akebia Therapeutics, Inc. AKBA 0001591467 Butler John P. C/O AKEBIA THERAPEUTICS, INC. 245 FIRST STREET CAMBRIDGE MA 02142 true true false false CEO and President Common Stock 2019-06-03 4 M false 287000.00 0.47 A 836232.00 D Common Stock 31047.00 I Held by Dorothy Butler 2016 GRAT Common Stock 59928.00 I Held by Dorothy Butler 2019 GRAT Common Stock 31047.00 I Held by John Butler 2016 GRAT Common Stock 59928.00 I Held by John Butler 2019 GRAT Employee Stock Option (Right to buy) 0.47 2019-06-03 4 M false 287000.00 0.00 D 2023-09-16 Common Stock 287000.00 0.00 D Reflects the transfer on March 15, 2019 of 65,150 shares of common stock from the reporting person's direct holdings to certain of the reporting person's trusts, the holdings for which are reported in Table I of this Form 4. On September 16, 2013, the Issuer granted the reporting person an option to purchase 612,500 shares of the Issuer's common stock (the "Option") under the Issuer's Amended and Restated 2008 Equity Incentive Plan. 25% of the shares underlying the Option vested on the first anniversary of the grant date, and the remaining 75% vested in equal monthly installments over the following three years. Prior to May 31, 2019, the reporting person exercised the Option with respect to 325,500 shares. On May 31, 2019, the reporting person exercised the Option with respect to 287,000 shares, as reported on this Form 4. /s/ Nicole R. Hadas, attorney-in-fact for John P. Butler 2019-06-05