X0306 4 2020-06-09 0 0001743725 GRID DYNAMICS HOLDINGS, INC. GDYN 0001814906 Explorer Parent LLC 533 AIRPORT BOULEVARD SUITE 400 BURLINGAME CA 94010 0 0 1 0 0001814907 Founder Holdings LLC 533 AIRPORT BOULEVARD SUITE 400 BURLINGAME CA 94010 0 0 1 0 0001752872 Chaserg Technology Sponsor LLC 533 AIRPORT BOULEVARD SUITE 400 BURLINGAME CA 94010 0 0 1 0 Common Stock 2020-06-09 4 S 0 6454 9.0024 D 46546 I See footnote Common Stock 2020-06-10 4 S 0 46546 8.876 D 0 I See footnote Common Stock 6030000 I See footnote The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.00 to $9.06. The reporting person undertakes to provide Grid Dynamics Holdings, Inc. (the "Company"), any security holder of the Company, 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 range set forth in this footnote. Explorer Parent LLC ("Explorer") is the record holder of the securities reported herein. Founder Holdings LLC ("Founder"), as the managing member of Explorer, may be deemed to share beneficial ownership of these securities. By virtue of the relationships between Explorer, Founder and ChaSerg Technology Sponsor LLC ("Sponsor"), each of Explorer and Founder may be deemed to share beneficial ownership of the securities held of record by Sponsor. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.75 to $9.035. The reporting person undertakes to provide the Company, any security holder of the Company, 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 range set forth in this footnote. By Sponsor. Explorer Parent LLC By: Founder Holdings LLC, its managing member, By: /s/ Steven Fletcher, a Managing Member, By: /s/ Alex Vieux, a Managing Member 2020-06-12 Founder Holdings LLC By: /s/ Steven Fletcher, a Managing Member, By: /s/ Alex Vieux, a Managing Member 2020-06-12 ChaSerg Technology Sponsor LLC By: /s/ Steven Fletcher, a Managing Member 2020-06-12