X0508 4 2025-12-16 0 0001724521 Arcus Biosciences, Inc. RCUS 0002056093 Markus Richard C/O ARCUS BIOSCIENCES, INC. 3928 POINT EDEN WAY HAYWARD CA 94545 0 1 0 0 Chief Medical Officer 1 Common Stock 2025-12-16 4 S 0 5052 21.8843 D 70141 D Common Stock 2025-12-17 4 S 0 4494 22.1595 D 65647 D Represents shares sold by the issuer on the reporting person's behalf to cover tax withholding obligations in connection with the vesting of certain RSUs (previously reported in Table I) following the date of grant. The sale occurred automatically pursuant to the Issuer's equity administration policy, which was implemented on May 22, 2025, and does not represent a discretionary trade by the reporting person. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.42 to $22.39, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. Includes the unvested portion of the reporting person's RSU grants. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.92 to $22.42, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The vesting schedule was incorrectly reported for the equity awards granted on February 10, 2025. The RSUs vest in four equal annual installments beginning December 15, 2025 and the options become exerciseable in 48 equal monthly installments after January 31, 2025, in each case, subject to the Reporting Person's continued service to the Company. /s/ Carolyn Tang, Attorney-in-Fact 2025-12-18