X0306 4 2020-09-13 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 2020-09-13 4 A 0 240000 0.00 A 692219 D Represents Restricted Stock Units ("RSUs") one-third of which vests on September 13, 2021 with the remaining RSUs vesting in equal quarterly installments over a two year period thereafter. 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. /s/ Tamara L. Tompkins, Attorney-in-Fact for Jamie Dananberg 2020-09-15