X0306 4 2021-02-26 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 2021-02-26 4 A false 237400.00 0.00 A 1166732.00 D Common Stock 2021-03-01 4 S false 25316.00 3.3961 D 1141416.00 D Common Stock 2021-03-01 4 S false 24674.00 3.3961 D 1116742.00 D Common Stock 59928.00 I Held by Dorothy Butler 2019 GRAT Common Stock 100000.00 I Held By Dorothy Butler GRAT November 2019 Common Stock 31047.00 I Held by Dorothy Butler Revocable Trust 2007 Common Stock 59928.00 I Held by John Butler 2019 GRAT Common Stock 100000.00 I Held By John Butler GRAT November 2019 Common Stock 31047.00 I Held by John Butler Revocable Trust 2007 Employee Stock Option (Right to buy) 3.46 2021-02-26 4 A false 403600.00 0.00 A 2031-02-26 Common Stock 403600.00 403600.00 D The restricted stock units were granted by the Issuer pursuant to its 2014 Incentive Plan, as amended. One third of the restricted stock units will vest on each of the first, second and third anniversaries of the grant date, subject to the reporting person's continued service with the Issuer on each vesting date. Includes 1,500 shares of the Issuer's common stock purchased on June 30, 2020 and 1,200 shares of the Issuer's common stock purchased on December 31, 2020, each under the Issuer's 2014 Amended and Restated Employee Stock Purchase Plan, and transfer of shares of the Issuer's common stock which were contributed to two grantor retained annuity trusts. This sale was made automatically by the Issuer to cover tax withholding obligations in connection with the vesting and settlement of one-third of the reporting person's restricted stock units granted on February 28, 2019. This sale was made automatically by the Issuer to cover tax withholding obligations in connection with the vesting and settlement of one-third of the reporting person's restricted stock units granted on February 28, 2020. The options were granted by the Issuer pursuant to its 2014 Incentive Plan, as amended. The options will vest over four years: 25% of the options will vest on the first anniversary of the grant date with the remaining 75% vesting in equal quarterly installments thereafter, subject to the reporting person's continued service with the Issuer on each vesting date. /s/ Andrea J. Paul, attorney-in-fact for John P. Butler 2021-03-02