X0609 4 2026-08-31 0 0001104657 MATERION Corp MTRN 0001204034 KHILNANI VINOD M false 6070 PARKLAND BLVD. MAYFIELD HEIGHTS OH 44124 1 0 0 0 0 Common Stock 2026-08-31 4 S 0 2000 235.161 D 11171 D Common Stock 20023.498 I Held in Directors Deferred Compensation Plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $234.980 to $235.830, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the Staff of the Securities 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 2026-09-01