Melissa A. Fashinpaur - 01 Mar 2026 Form 4 Insider Report for MATERION Corp (MTRN)

Role: Chief Accounting Officer
Signature: /s/Michelle R. Mekinda, as Attorney-In-Fact
Issuer symbol: MTRN
Transactions as of: 01 Mar 2026
Net transactions value: -$99,750
Form type: 4
Filing time: 03 Mar 2026, 19:16:30 UTC
Previous filing: 13 Feb 2026
Next filing: 10 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Fashinpaur Melissa A	Chief Accounting Officer	6070 PARKLAND BOULEVARD, MAYFIELD HEIGHTS	/s/Michelle R. Mekinda, as Attorney-In-Fact	03 Mar 2026	0002072270

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MTRN	Common Stock	Options Exercise	$0	+659	+252%	$0.000000	921	01 Mar 2026	Direct
transaction	MTRN	Common Stock	Tax liability	$50,310	-302	-33%	$166.59	619	02 Mar 2026	Direct
transaction	MTRN	Common Stock	Sale	$49,440	-309	-50%	$160.00	310	03 Mar 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MTRN	Restricted Stock Units	Options Exercise	$0	-659	-29%	$0.000000	1,607	01 Mar 2026	Common Stock	659		Direct	F1, F2, F3
transaction	MTRN	Restricted Stock Units	Award	$0	+628	+39%	$0.000000	2,235	01 Mar 2026	Common Stock	628		Direct	F1, F3, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a right to receive one share of MTRN common stock.
F2	These restricted stock units granted on 03/01/2023, 03/01/2024, and 03/01/2025, and any related dividend equivalents, vest in three equal annual installments.
F3	Expiration Date is the same as the Date Exercisable.
F4	These restricted stock units vest in three equal annual installments beginning March 1, 2027.