Press Release: MKS Inc. Reports Third Quarter -4-

Taxes Taxes Tax Rate Taxes Taxes Tax Rate -------- ----------- ----------- -------- ----------- ----------- GAAP $ 287 $ 51 17.6% $ 213 $ 38 17.8% Restructuring and other 5 -- 6 -- Legal settlement -- -- -- -- Amortization of intangible assets 62 -- 62 -- Loss on extinguishment of debt 5 -- 4 -- Amortization of debt issuance costs 3 -- 3 -- Tax effect of Non-GAAP adjustments -- 19 -- 18 Non-GAAP $ 362 $ 70 19.1% $ 288 $ 56 19.6% ==== === ====== ==== ==== =====

Three Months Ended September 30, 2025 ---------------------------------- Income Before Provision Income for Income Effective Taxes Taxes Tax Rate -------- ----------- -----------

GAAP $ 84 $ 10 12.3% Restructuring and other 4 -- Amortization of intangible assets 63 -- Loss on extinguishment of debt 2 -- Amortization of debt issuance costs 5 -- Tax effect of Non-GAAP adjustments -- 18 Non-GAAP $ 158 $ 28 17.9% ==== ==== =====

Nine Months Ended September 30, Nine Months Ended September 30, 2026 2025 ---------------------------------- ---------------------------------- Income Income Before Provision Before Provision Income for Income Effective Income for Income Effective Taxes Taxes Tax Rate Taxes Taxes Tax Rate -------- ----------- ----------- -------- ----------- ----------- GAAP $ 601 $ 106 17.7% $ 215 $ 27 12.7% Restructuring and other 14 -- 26 -- Legal settlement 3 -- -- -- Amortization of intangible assets 187 -- 184 -- Loss on extinguishment of debt 14 -- 8 -- Amortization of debt issuance costs 9 -- 14 -- Loss from de-designation of interest rate hedges 2 -- -- -- Fees and expenses related to debt activities 18 -- 2 -- Tax effect of Non-GAAP adjustments -- 61 -- 57 ---- --- ------ ---- ---- ----- Non-GAAP $ 848 $ 167 19.7% $ 449 $ 84 18.7% ==== === ====== ==== ==== =====

MKS Inc. Schedule Reconciling Selected Non-GAAP Financial Measures - Q4'26 Guidance (In millions, except per share data)

Three Months Ending December 31, 2026 --------------------------------------------- $ Amount Per Share ---------------------------- --------------- GAAP net income and net income per share $ 294 $ 4.04 Restructuring and other 6 Amortization of intangible assets 61 Loss on extinguishment of debt 8 Amortization of debt issuance costs 3 Tax effect of Non-GAAP adjustments (20) Non-GAAP net earnings and net earnings per share $ 352 $ 5.00

Weighted average diluted shares 72.9 Convertible debt capped calls (2.4) ------ --------------- Non-GAAP weighted average diluted shares 70.5

GAAP operating expenses $ 355 Restructuring and other (6) Amortization of intangible assets (61) ------ --------------- Non-GAAP operating expenses $ 288 ====== =============== ===

GAAP net income 294 Interest expense, net 35 Provision for income taxes 16 Depreciation 26 Restructuring and other 6 Amortization of intangible assets 61 Stock-based compensation 15 Loss on extinguishment of debt 8 Adjusted EBITDA $ 461 ====== =============== ===

MKS Inc.

Notes on Our Non-GAAP Financial Information

Non-GAAP financial measures adjust GAAP financial measures for the items listed below. These Non-GAAP financial measures should be viewed in addition to, and not as a substitute for, MKS' reported GAAP results, and may be different from Non-GAAP financial measures used by other companies. In addition, these Non-GAAP financial measures are not based on any comprehensive set of accounting rules or principles. MKS management believes the presentation of these Non-GAAP financial measures is useful to investors for comparing prior periods and analyzing ongoing business trends and operating results. Totals presented may not sum and percentages may not recalculate using figures presented due to rounding.

Restructuring and other includes incremental expenses incurred in connection with restructuring programs and other strategic initiatives, primarily related to changes in business and/or cost structure. Such costs may include third-party services, one-time termination benefits, facility-related costs, contract termination fees and other items that have no direct correlation to our future business operations.

Legal settlement includes charges related to the resolution of legal matters.

Amortization of intangible assets includes non-cash amortization expense associated with intangible assets acquired in acquisitions.

Loss on extinguishment of debt includes the non-cash write-off of unamortized debt issuance costs and original issue discount costs incurred from voluntary prepayments, refinancings and/or repricings of our term loan facility.

Amortization of debt issuance costs includes non-cash additional interest expense related to the amortization of debt issuance costs associated with our debt.

Loss from de-designation of interest rate hedges includes a cash loss from the de-designation of certain interest rate hedges in connection with the voluntary prepayment of the USD term loan B.

Fees and expenses related to debt activities includes direct third-party costs related to repricings or refinancings of our term loan facility and the issuance of our EUR1.0 billion of senior notes due 2034 in February 2026.

Convertible debt capped calls includes the antidilutive impact of the capped call transactions entered into in connection with the issuance of $1.4 billion of convertible senior notes in May 2024. The capped calls are designed to reduce potential dilution to the Company's common stock and/or offset cash payments in excess of the principal upon conversion of the notes, subject to a cap. Because the capped calls are excluded from GAAP diluted share calculations, GAAP and Non-GAAP diluted share counts will differ.

Tax effect of Non-GAAP adjustments includes the impact of Non-GAAP adjustments that are tax effected at applicable statutory rates resulting in a difference between the GAAP and Non-GAAP tax rates.

(END) Dow Jones Newswires

November 04, 2026 16:30 ET (21:30 GMT)