MKS Inc. Executive Vice President Kathleen F. Burke Announces Retirement

On March 31, 2026, Kathleen F. Burke notified MKS Inc. of her intent to retire as Executive Vice President, General Counsel and Secretary effective June 1, 2026. Burke will remain employed in a transitional role as special advisor to the corporation until July 1, 2026. This filing reports the departure of a key executive officer under Item 5.02 requirements. The retirement represents a significant leadership change for MKS Inc., a Massachusetts-based company trading on the Nasdaq Global Select Market under symbol MKSI. The company's principal executive offices are located in Andover, Massachusetts. The filing was signed by John T.C. Lee, President and Chief Executive Officer, on April 6, 2026.