HEARTLAND ADVISORS INC

Position in PLAB — Photronics Inc

CIK 937394 MILWAUKEE, WI

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Position in PLAB

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

Position Value

$14,978,976

+$2,654,176 QoQ

Shares Held

370,675

-3.8% QoQ

Ownership

0.629%

of shares outstanding

% of Portfolio

0.77%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 93% Shared 0% None 7%

Common Shares in PLAB Over Time

Shares Held

Position Value (USD)

Position in Semiconductor Equipment & Materials

Technology · as of Mar 31, 2026

HEARTLAND ADVISORS INC holds $28,829,368 across 4 Semiconductor Equipment & Materials names. PLAB ranks #1 (52.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PLAB	Photronics Inc This page	370,675	$14,978,976
2	ICHR	Ichor Holdings, Ltd.	200,000	$9,322,000
3	AMAT	Applied Materials Inc /De	7,803	$2,666,987
4	LRCX	Lam Research Corp	8,712	$1,861,405

All Filings in PLAB

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$14,978,976	370,675	-3.8%	Shares	Defined	2026-05-06
2025-12-31	$12,324,800	385,150	-21.4%	Shares	Defined	2026-02-11
2025-09-30	$11,247,221	490,075	+0.2%	Shares	Defined	2025-11-07
2025-06-30	$9,210,694	489,150	+43.6%	Shares	Defined	2025-08-12
2025-03-31	$7,070,856	340,600	0.0%	Shares	Defined	2025-05-07
2024-12-31	$8,024,536	340,600	+0.6%	Shares	Defined	2025-02-12
2024-09-30	$8,383,736	338,600	+19.8%	Shares	Defined	2024-11-12
2024-06-30	$6,970,508	282,550	+41.3%	Shares	Defined	2024-08-08
2024-03-31	$5,664,000	200,000	0.0%	Shares	Defined	2024-05-07
2023-12-31	$6,274,000	200,000	-11.1%	Shares	Defined	2024-02-08
2023-09-30	$4,547,250	225,000	-25.0%	Shares	Defined	2023-11-08
2023-06-30	$7,737,000	300,000	-51.0%	Shares	Defined	2023-08-10
2023-03-31	$10,154,006	612,425	+2.4%	Shares	Defined	2023-05-11
2022-12-31	$10,068,968	598,275	-0.3%	Shares	Defined	2023-02-08
2022-09-30	$8,776,020	600,275	+68.1%	Shares	Defined	2022-11-10
2022-06-30	$6,956,308	357,100	+9.9%	Shares	Defined	2022-08-12
2022-03-31	$5,515,250	325,000	-61.3%	Shares	Defined	2022-05-12
2021-12-31	$15,846,252	840,650	-1.8%	Shares	Defined	2022-02-09
2021-09-30	$11,665,917	855,900	-5.1%	Shares	Defined	2021-11-09
2021-06-30	$11,918,062	902,200	0.0%	Shares	Defined	2021-08-11
2021-03-31	$11,602,292	902,200	-0.1%	Shares	Defined	2021-05-12
2020-12-31	$10,081,944	903,400	+42.7%	Shares	Defined	2021-02-11
2020-09-30	$6,304,680	633,000	+83.6%	Shares	Defined	2020-11-12
2020-06-30	$3,837,078	344,751	+71.6%	Shares	Defined	2020-08-12
2020-03-31	$2,061,264	200,903	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.