The Rosen Law Firm is reaching out to Avantor stockholders who have suffered significant losses, indicating potential legal actions.Director SUMME GREGORY L's purchase of 100,000 shares signals confidence in Avantor's future prospects.Avantor's stock has experienced significant volatility, with a wide range of price movements over the past year.Avantor, Inc. (NYSE:AVTR) is a global provider of mission-critical products and services to customers in the life sciences and advanced technologies industries. The ...