On February 13, 2024 (the ?Effective Date?), MKS Instruments, Inc., a Massachusetts corporation (the ?Company?), entered into the Third Amendment to Credit Agreement (the ?Third Amendment?), which amends the Credit Agreement, dated as of August 17, 2022, by and among the Company, the lenders and letter of credit issuers party thereto and JPMorgan Chase Bank, N.A., as administrative agent and collateral agent (as amended from time to time, including by the First Amendment to Credit Agreement, dated October 3, 2023, by the Second Amendment to Credit Agreement, dated January 22, 2024, and by the Third Amendment, the ?Credit Agreement?). Pursuant to the Third Amendment, the Company increased the available borrowing capacity under its senior secured revolving credit facility by $175 million (the ?Incremental Revolving Commitments?), from $500 million to $675 million. In connection with the execution of the Third Amendment, the Company paid customary fees and expenses to the lenders providing the Incremental Revolving Commitments and to JPMorgan Chase Bank, N.A.