X0306 4 2023-02-09 0 0001532346 Atreca, Inc. BCEL 0001230721 CROSS HERB C/O ATRECA, INC., 835 INDUSTRIAL RD. SUITE 400 SAN CARLOS CA 94070 0 1 0 0 Chief Financial Officer Class A Common Stock 2023-02-09 4 A 0 43750 0.00 A 78304 D Employee stock option (right to buy) 1.49 2023-02-09 4 A 0 175000 0.00 A 2033-02-08 Class A Common Stock 175000 175000 D The reporting person received an award of 43,750 restricted stock units on February 9, 2023, vesting in three equal annual installments beginning on August 1, 2023. Each restricted stock unit represents a right to receive one share of Atreca Class A Common Stock upon vesting. 1/48 of the Option vests in equal monthly installments as measured from January 1, 2023. If applicable, vesting accelerates as provided in, and subject to the terms and conditions of, that certain Executive Employment Agreement between the Issuer and the Reporting Person, as may be amended from time to time. /s/ Courtney Phillips, Attorney-In-Fact 2023-02-13