X0306 4 2020-03-30 0 0001463361 Unity Biotechnology, Inc. UBX 0001734424 Dananberg Jamie C/O UNITY BIOTECHNOLOGY, INC. 285 EAST GRAND AVENUE SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Medical Officer Common Stock, $0.0001 par value 2020-03-30 4 A 0 24255 0.00 A 454702 D Stock Option (Right to Buy) 5.95 2020-03-30 4 A 0 98490 0.00 A 2030-03-29 Common Stock 98490 98490 D Represents Restricted Stock Units ("RSUs") which vest in equal annual installments over a three year period measured from March 30, 2020. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer. Includes RSUs which vest over time measured from the grant date. Shares subject to the stock option vest and become exercisable in successive, equal monthly installments over a 48-month period commencing on March 30, 2020 (the "Vesting Commencement Date"), so that 100% of the shares become fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, subject to Reporting Person's continued employment or service relationship with the Issuer on each such vesting date. /s/ Tamara L. Tompkins, Attorney-in-Fact for Jamie Dananberg 2020-04-01