X0306 4 2020-10-14 0 0001741830 Kronos Bio, Inc. KRON 0001361712 Stampacchia Otello 888 BOYLSTON ST. SUITE 1111 BOSTON MA 02199 1 0 1 0 Common Stock 2020-10-14 4 C 0 1606220 A 1625671 I By Omega Fund V, LP Common Stock 2020-10-14 4 C 0 1376313 A 3001984 I By Omega Fund V, LP Common Stock 2020-10-14 4 C 0 366299 16.15 A 3368283 I By Omega Fund V, LP Common Stock 2020-10-14 4 P 0 450000 19.00 A 3818283 I By Omega Fund V, LP Series Seed Preferred Stock 2020-10-14 4 C 0 1522484 D Common Stock 1606220 0 I By Omega Fund V, LP Series A Preferred Stock 2020-10-14 4 C 0 1304563 D Common Stock 1376313 0 I By Omega Fund V, LP Convertible Promissory Note 16.15 2020-10-14 4 C 0 5915729.63 0.00 D 2022-02-20 Common Stock 366299 0 I By Omega Fund V, LP Each share of Series Seed Preferred Stock and Series A Preferred Stock (the "Preferred Stock") automatically converted into 1.055 shares of Common Stock upon the closing of the Issuer's initial public offering. The Preferred Stock had no expiration date. The reporting person, Claudio Nessi and Anne-Mari Paster are the directors of Omega Fund V GP Manager, Ltd. ("Omega Manager"), which is the sole general partner of Omega V Fund GP, L.P. ("Omega GP"), which is the sole general partner of Omega Fund V, L.P. ("Omega L.P."). The reporting person may be deemed to share voting and dispositive power over the shares held by Omega L.P. The reporting person, together with Omega GP and Omega Manager, disclaims beneficial ownership of the shares held by Omega L.P. except to the extent of his pecuniary interest therein. The convertible promissory note automatically converted into shares of the Issuer's common stock upon the closing of the Issuer's initial public offering. /s/ David Tanen, Attorney-in-Fact 2020-10-16