X0306 4 2022-05-17 0 0001741830 Kronos Bio, Inc. KRON 0001190273 BISCHOFBERGER NORBERT W C/O KRONOS BIO, INC. 1300 SO. EL CAMINO REAL, SUITE 400 SAN MATEO CA 94402 1 1 0 0 President & CEO Common Stock 2022-05-17 4 P 0 90931 3.8329 A 303411 D Common Stock 2022-05-18 4 P 0 206198 3.7248 A 509609 D Common Stock 2022-05-19 4 P 0 300000 3.7817 A 809609 D Common Stock 4370494 I See footnote Common Stock 263750 I See footnote Common Stock 263750 I See footnote Common Stock 263750 I See footnote Common Stock 263750 I See footnote The weighted average purchase price for the transaction reported was $3.8329, and the range of prices were between $3.70 and $3.95. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased at each separate price will be provided. The weighted average purchase price for the transaction reported was $3.7248, and the range of prices were between $3.60 and $4.00. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased at each separate price will be provided. The weighted average purchase price for the transaction reported was $3.7817, and the range of prices were between $3.54 and $4.00. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased at each separate price will be provided. By the Norbert W. & Inger A. Bischofberger Revocable Inter Vivos Trust, dtd August 29, 1994. By the Norbert W. Bischofberger and Inger A. Bischofberger, Trustees of The David Michael Anthony Dynasty GST Exempt Trust dated April 29, 2020. By Norbert W. Bischofberger and Inger A. Bischofberger, Trustees of The David Michael Anthony Dynasty GST Non-Exempt Trust dated April 29, 2020 By Norbert W. Bischofberger and Inger A. Bischofberger, Trustees of The Irene Alisha Bischofberger Dynasty GST Exempt Trust dated April 29, 2020. By Norbert W. Bischofberger and Inger A. Bischofberger, Trustees of The Irene Alisha Bischofberger Dynasty GST Non-Exempt Trust dated April 29, 2020 /s/ Allison Frisbee, Attorney-in-Fact 2022-05-19