ACQUISITION OF COHERENT

Q4 FY23 OPERATING MARGIN Lower Q4 FY23 primarily driven by lower revenue and short term capacity underutilization Transitory interruption of longer-term expansion trend Non-GAAP Gross and Operating Margins(1) 40.3% 38.5% 21.3% 39.8% 37.3% 35.9% ■Non-GAAP Gross Margin ■Non-GAAP Operating Margin 20.3% LAALA 17.2% 17.5% 15.4% Q4 FY22 Q1 FY23 Q2 FY23 Q3 FY23 Q4 FY23 Proforma(2) (1) All non-GAAP amounts exclude certain adjustments for share-based compensation, acquired intangible amortization expense, certain one-time transaction expenses, debt extinguishment expense, fair value measurement period adjustments and restructuring and related items. See Appendix for reconciliation to most comparable GAAP measures. (2) Includes the results od both II-VI Incorporated and Coherent, Inc. for the three months ended June 30, 2022 COHERENT Copyright 2023, Coherent. All rights reserved. 17

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