MKS Inc. Executive Officer's Restricted Stock Unit Grant

On August 4, 2025, James Alan Schreiner, Executive Vice President and Chief Operating Officer of MKS Inc., was granted 1,329.787 restricted stock units (RSUs). Each RSU represents the contingent right to receive one share of MKS Inc. common stock. The RSUs vest in three equal annual installments starting on February 15, 2026, or the next business day if February 15th is not a business day. Following this transaction, Schreiner owns a total of 15,659.082 shares of MKS Inc. common stock. The grant was reported in a Form 4 filing with the SEC.