X0508 4 2026-02-17 0 0001104657 MATERION Corp MTRN 0001204034 KHILNANI VINOD M 6070 PARKLAND BLVD. MAYFIELD HEIGHTS OH 44124 1 0 0 0 0 Common Stock 2026-02-17 4 S 0 2446 148.666 D 15219 D Common Stock 2026-02-17 4 S 0 1554 149.176 D 13665 D Common Stock 19992.731 I Held in Directors Deferred Compensation Plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transaction at prices ranging from $148.340 to $148.970, 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 ranges set forth in footnotes (1) and (3) of this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transaction at prices ranging from $149.010 to $149.415, inclusive. /s/Michelle R. Mekinda, as Attorney-In-Fact 2026-02-19