Chadwick Shelly Marie 4

What Happened

• Shelly Chadwick, Vice President, Finance & CFO of MATERION Corp (MTRN), exercised 4,912 stock appreciation rights (SARs) on 2026-05-08. The exercise recorded an acquisition at an exercise price of $113.28 per share (total cost $556,431). To satisfy tax withholding and take proceeds, 3,720 shares were withheld/disposed at $199.14 ($740,801) and 1,192 shares were sold in the open market at $198.88 ($237,065). Total shares acquired and then disposed equal 4,912 shares; combined proceeds from the disposals were $977,866.

Key Details

• Transaction date: 2026-05-08; Form 4 filed 2026-05-12 (timely).
• Exercise (code M): 4,912 shares @ $113.28 = $556,431 (acquired).
• Tax withholding (code F): 3,720 shares @ $199.14 = $740,801 (disposed).
• Open-market sale (code S): 1,192 shares @ $198.88 = $237,065 (disposed).
• Shares owned after the transactions: not specified in the summary provided.
• Footnote: The SARs vested in three equal annual installments beginning March 1, 2024 (per filing).

Context

• This was effectively a cashless exercise: SARs were exercised and the resulting shares were partly withheld to cover tax obligations and partly sold on the open market. Tax-withholding disposals are routine following exercises and do not necessarily signal the insider’s view on the company’s outlook. Purchases are typically more informative than routine post-exercise sales.