Form 4 for MTRN MATERION Corp

Accepted 2026-05-11 14:01:45 ET · period of report 2026-05-07 · accession 0001204034-26-000016 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-05-11 14:01	2026-05-07	MTRN	KHILNANI VINOD M	Dir	M - OptEx	—	+2,006	15.7K	+15%	—
D	2026-05-11 14:01	2026-05-07	MTRN	KHILNANI VINOD M	Dir	M - OptEx	$0.00	-2,006	0	-100%	$0
D	2026-05-11 14:01	2026-05-08	MTRN	KHILNANI VINOD M	Dir	A - Grant	$0.00	+837	837	New	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-05-07	M	A	2,006	—	15,671	D	—	—	(F1) Each restricted stock unit represents a right to receive one share of MTRN common stock.
2	Derivative	Restricted Stock Units	2026-05-07	M	D	2,006	$0.00	0	D	— · — to —	2,006 Common Stock	(F1) Each restricted stock unit represents a right to receive one share of MTRN common stock. (F2) These shares were issued pursuant to the vesting of a restricted stock unit award made May 8, 2025 that vested on May 7, 2026. (F3) Expiration Date is the same as the Date Exercisable.
3	Derivative	Restricted Stock Unit	2026-05-08	A	A	837	$0.00	837	D	— · — to —	837 Common Stock	(F1) Each restricted stock unit represents a right to receive one share of MTRN common stock. (F4) The restricted stock units generally vest on the earlier of (1) the first anniversary of the grant date and (2) the next annual meeting of MTRN's shareholders that follows the grant. (F3) Expiration Date is the same as the Date Exercisable.