Gregory L. Summe, who is on the Board of Avantor (AVTR 0.86%), completed an open-market purchase of 100,000 shares in the company on October 30, 2025, as disclosed in this SEC Form 4 filing. Mr. Summe will become Avantor's next Chairman of the Board at the start of 2026.Transaction summaryMetricValueTransaction value$1.13 millionPost-transaction shares358,111Post-transaction value (direct and indirect ownership)$4.03 millionTransaction value calculated using the SEC Form 4 reported price ($11.25) as of Octo ...