Exhibit 99.1 Avantor® Reports First Quarter 2026 Results RADNOR, Pa. – April 29, 2026 –Avantor, Inc. (NYSE: AVTR), a leading global provider of mission-critical products and services to customers in the life sciences and advanced technology industries, today reported financial results for its first fiscal quarter ended March 31, 2026. "First quarter results exceeded our expectations due to improved execution in Bioscience and Medtech Products, and we saw stabilization in VWR," said Emmanuel Ligner, Presiden ...