Richardson Electronics Strategic Business Overview

PMT Update • PMT Highlights High growth in demand for Electron Device Group (EDG); new applications (diamonds, hydrogen as fuel source, sustainable building products) Semiconductor wafer fab equipment benefitting from market growth; chip shortages create new wafer fabrication installations Power & Microwave Group (PMG) continues to have excellent sales growth related to 5G and alternative energy PMT Sales ($ in 000s) Third Quarter Sales Up 25.0% YoY $50,000 $40,000 $30,000 $20,000 $10,000 || | || Q3 FY21 Q4 FY21 Q1 FY22 Q2 FY22 Q3 FY22 Investor Presentation | Richardson Electronics, Ltd. Richardson Electronics 14

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