Exhibit 99.1 Grid Dynamics Reports First Quarter 2026 Financial Results Revenues of $104.1 million and Record AI Revenues of 29.3% San Ramon, Calif. — April 30, 2026 – Grid Dynamics Holdings, Inc. (Nasdaq: GDYN) ("Grid Dynamics" or the "Company"), a leader in enterprise-level AI and digital transformation, today announced results for the quarter ended March 31, 2026. We are pleased to report first quarter 2026 revenues of $104.1 million, slightly above the higher end of our guidance range of $103.0 million ...