X0306 4 2021-09-07 0 0001743725 GRID DYNAMICS HOLDINGS, INC. GDYN 0001805664 Klimoff Stan C/O GRID DYNAMICS HOLDINGS, INC. 5000 EXECUTIVE PARKWAY, SUITE 520 SAN RAMON CA 94583 0 1 0 0 Chief Strategy Officer Common Stock 2021-09-07 4 S 0 4000 30.4837 D 189202 D Common Stock 2021-09-07 4 S 0 3000 30.4305 D 86459 I See footnote The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2021 by the Reporting Person. This transaction was executed in multiple trades at prices ranging from $30.08 to $30.98. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2021 by the O. Fox Charitable Trust for which the Reporting Person serves as trustee (the "O. Fox Trust"). This transaction was executed in multiple trades at prices ranging from $30.04 to $30.94. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price. The shares are held of record by the O. Fox Trust. /s/ Anil Doradla, by power of attorney 2021-09-09