X0306 4 2018-07-11 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 2018-07-11 4 M false 100000.00 0.47 A 510314.00 D Employee Stock Option (Right to buy) 0.47 2018-07-11 4 M false 100000.00 0.00 D 2023-09-16 Common Stock 100000.00 287000.00 D The total amount of beneficial securities owned includes 1,500 shares of stock purchased on June 29, 2018 at $8.48 per share in connection with the Issuer's Employee Stock Purchase Plan. 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 thereafter. Prior to July 11, 2018, the reporting person exercised the Option with respect to 225,500 shares. On July 11, 2018, the reporting person exercised the Option with respect to 100,000 shares, as reported on this Form 4. Nicole R. Hadas, attorney-in-fact for John P. Butler 2018-07-12