Granahan Investment Management, LLC

Position in MTRN — MATERION Corp

CIK 1026710 WALTHAM, MA

Position in MTRN

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$20,898,453

+$3,714,197 QoQ

Shares Held

144,476

+4.5% QoQ

Ownership

0.695%

of shares outstanding

% of Portfolio

1.01%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 89% Shared 0% None 11%

Basic Materials · as of Mar 31, 2026

Granahan Investment Management, LLC holds $29,494,834 across 3 Other Industrial Metals & Mining names. MTRN ranks #1 (70.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MTRN	MATERION Corp This page	144,476	$20,898,453
2	MP	MP Materials Corp. / DE	138,658	$6,691,635
3	UAMY	United States Antimony Corp	218,184	$1,904,746

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$20,898,453	144,476	+4.5%	Shares	Sole	2026-05-15
2025-12-31	$17,184,256	138,226	+46.6%	Shares	Sole	2026-02-17
2025-09-30	$11,389,483	94,276	-22.1%	Shares	Sole	2025-11-14
2025-06-30	$9,604,166	121,005	-2.8%	Shares	Sole	2025-08-14
2025-03-31	$10,158,302	124,489	-1.5%	Shares	Sole	2025-05-15
2024-12-31	$12,495,168	126,367	-7.6%	Shares	Sole	2025-02-14
2024-09-30	$15,290,702	136,695	-29.6%	Shares	Sole	2024-11-14
2024-06-30	$20,993,223	194,148	-0.2%	Shares	Sole	2024-08-14
2024-03-31	$25,639,340	194,606	-14.2%	Shares	Sole	2024-05-15
2023-12-31	$29,530,270	226,929	-2.1%	Shares	Sole	2024-02-14
2023-09-30	$23,632,113	231,892	-1.1%	Shares	Sole	2023-11-14
2023-06-30	$26,784,239	234,538	-0.3%	Shares	Sole	2023-08-14
2023-03-31	$27,292,132	235,277	-1.8%	Shares	Sole	2023-05-15
2022-12-31	$20,970,196	239,632	+37.9%	Shares	Sole	2023-02-14
2022-09-30	$13,902,720	173,784	+16.7%	Shares	Sole	2022-11-14
2022-06-30	$10,979,576	148,916	-7.2%	Shares	Sole	2022-08-15
2022-03-31	$13,764,442	160,537	-33.0%	Shares	Sole	2022-05-16
2021-12-31	$22,040,316	239,725	+3.3%	Shares	Sole	2022-02-14
2021-09-30	$15,932,785	232,121	+7.9%	Shares	Sole	2021-11-15
2021-06-30	$16,205,373	215,068	+26.1%	Shares	Sole	2021-08-16
2021-03-31	$11,300,742	170,603	-14.7%	Shares	Sole	2021-05-17
2020-12-31	$12,737,564	199,899	-14.0%	Shares	Sole	2021-02-12
2020-09-30	$12,098,796	232,535	-10.1%	Shares	Sole	2020-11-12
2020-06-30	$15,912,751	258,786	+29.3%	Shares	Sole	2020-08-14
2020-03-31	$7,009,002	200,200	—	Shares	Sole	2020-05-12
No filing history on record for this holder in this stock.