X0508 4 2026-02-23 0 0001104657 MATERION Corp MTRN 0001688289 Chadwick Shelly Marie 6070 PARKLAND BLVD. MAYFIELD HTS. OH 44124 0 1 0 0 Vice President, Finance & CFO 0 Common Stock 2026-02-23 4 S 0 3975 145.029 D 21140 D Common Stock 2026-02-23 4 S 0 5001 147 D 16139 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $144.960 to 145.500, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the Staff of the Security and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/Michelle R. Mekinda, as Attorney-In-Fact 2026-02-25