Investor Presentaiton

History of Insightful Targeting and Successful Integration of Strategic Acquisitions 10 Years of Continuous Revenue Growth CAGR 20% Increased efficiencies II-VI 5 Transformative Acquisitions: 2022 - Laser sources & systems (4) 2019 - Indium phosphide technology platform 2016 - Epitaxial wafer and SiC electronic devices 2013 - Gallium arsenide technology platform 2010 Optical networks & China market Finisar Acquisition Bolstered Scale $2,380 Revenue ($M) $3,106 Q4FY21 OpEx as % of Revenue Without amortization and stock-based compensation, and transaction costs 26% -600 bps 20% 21% (3) Q4FY21 Non-GAAP Gross Margins 39% 40% (3) 31% +800 bps $1,362 $1,159 $972 $827 $683 $742 $487 $516 $551 FY11 FY12 FY13 FY14 FY15 FY16 FY17 FY18 FY19 FY20 FY21 (1) Figures prior to FY2019 do not reflect the adoption of ASC 606. PF(2) Q1 FY20 Q4 FY21 (2) (3) (4) Prepared in accordance to ASC 805. Pro Forma includes the revenue of Finisar in Q1FY20 prior to the acquisition date of 9/24/20. FY21 actual. See Appendix for reconciliation to most comparable GAAP measures. Acquisition in process as of June 30, 2021. Copyright 2021, II-VI Incorporated. All rights reserved. Page 9

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