X0306 4 2018-10-10 0 0001463361 Unity Biotechnology, Inc. UBX 0001653881 Goeltz II Robert C. C/O UNITY BIOTECHNOLOGY, INC. 3280 BAYSHORE BOULEVARD BRISBANE CA 94005 0 1 0 0 Chief Financial Officer Common Stock, $0.0001 par value 2018-10-10 4 M 0 5000 3.43 A 101348 D Stock Option (Right to Buy) 3.43 2018-10-10 4 M 0 5000 0.00 D 2027-09-26 Common Stock 5000 120620 D The underlying shares vest pursuant to the following schedule: Twenty Five Percent (25%) of the shares subject to the option vested on September 5, 2018 (the "Vesting Commencement Date"), and the remaining shares subject to the option vest in 36 successive, equal monthly installments thereafter on each monthly 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 Robert C. Goeltz II 2018-10-12