HEARTLAND ADVISORS INC

Position in MTRN — MATERION Corp

CIK 937394 MILWAUKEE, WI

Position in MTRN

as of Mar 31, 2026 · filed May 6, 2026 Compact

Position Value

$6,994,116

+$671,326 QoQ

Shares Held

48,352

-4.9% QoQ

Ownership

0.232%

of shares outstanding

% of Portfolio

0.36%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

19 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Basic Materials · as of Mar 31, 2026

HEARTLAND ADVISORS INC holds $6,994,116 across 1 Other Industrial Metals & Mining name. MTRN ranks #1 (100.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	MTRN	MATERION Corp This page	48,352	$6,994,116

19 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$6,994,116	48,352	-4.9%	Shares	Defined	2026-05-06
2025-12-31	$6,322,790	50,859	-36.8%	Shares	Defined	2026-02-11
2025-09-30	$9,717,956	80,440	-11.5%	Shares	Defined	2025-11-07
2025-06-30	$7,210,208	90,843	-0.3%	Shares	Defined	2025-08-12
2025-03-31	$7,431,393	91,071	0.0%	Shares	Defined	2025-05-07
2024-12-31	$9,005,100	91,071	0.0%	Shares	Defined	2025-02-12
2024-09-30	$10,187,202	91,071	+89.5%	Shares	Defined	2024-11-12
2024-06-30	$5,196,403	48,057	-37.3%	Shares	Defined	2024-08-08
2022-12-31	$6,705,191	76,622	-25.6%	Shares	Defined	2023-02-08
2022-09-30	$8,234,480	102,931	-19.8%	Shares	Defined	2022-11-10
2022-06-30	$9,458,895	128,291	-10.8%	Shares	Defined	2022-08-12
2022-03-31	$12,326,411	143,765	-3.3%	Shares	Defined	2022-05-12
2021-12-31	$13,667,708	148,659	-6.4%	Shares	Defined	2022-02-09
2021-09-30	$10,902,503	158,836	+11.9%	Shares	Defined	2021-11-09
2021-06-30	$10,699,775	142,001	+10.7%	Shares	Defined	2021-08-11
2021-03-31	$8,494,485	128,238	+8.3%	Shares	Defined	2021-05-12
2020-12-31	$7,545,340	118,414	+35.5%	Shares	Defined	2021-02-11
2020-09-30	$4,545,496	87,363	+54.2%	Shares	Defined	2020-11-12
2020-06-30	$3,484,699	56,671	—	Shares	Defined	2020-08-12
No filing history on record for this holder in this stock.