Penbrook Management LLC

Position in PLAB — Photronics Inc

CIK 1381055 NEW YORK, NY

Position in PLAB

as of Mar 31, 2026 · filed Apr 21, 2026 Compact

Position Value

$3,908,859

+$367,099 QoQ

Shares Held

96,730

-12.6% QoQ

Ownership

0.164%

of shares outstanding

% of Portfolio

3.14%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 0.ToString("F0")% Shared 0.ToString("F0")% None 100.ToString("F0")%

Technology · as of Mar 31, 2026

Penbrook Management LLC holds $8,449,689 across 4 Semiconductor Equipment & Materials names. PLAB ranks #1 (46.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PLAB	Photronics Inc This page	96,730	$3,908,859
2	AEHR	Aehr Test Systems	79,515	$2,948,416
3	ACLS	Axcelis Technologies Inc	12,095	$1,125,802
4	KLIC	Kulicke & Soffa Industries Inc	7,100	$466,612

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$3,908,859	96,730	-12.6%	Shares	Sole	2026-04-21
2025-12-31	$3,541,760	110,680	-0.6%	Shares	Sole	2026-01-06
2025-09-30	$2,556,171	111,380	+4.7%	Shares	Sole	2025-10-22
2025-06-30	$2,004,076	106,430	+15.6%	Shares	Sole	2025-07-28
2025-03-31	$1,910,854	92,045	-1.1%	Shares	Sole	2025-04-01
2024-12-31	$2,192,140	93,045	+0.4%	Shares	Sole	2025-01-23
2024-09-30	$2,295,128	92,695	-10.3%	Shares	Sole	2024-10-15
2024-06-30	$2,550,754	103,395	-9.7%	Shares	Sole	2024-07-24
2024-03-31	$3,242,498	114,495	-6.0%	Shares	Sole	2024-04-18
2023-12-31	$3,820,866	121,800	-0.2%	Shares	Sole	2024-01-16
2023-09-30	$2,467,641	122,100	-0.2%	Shares	Sole	2023-10-10
2023-06-30	$3,156,696	122,400	-1.6%	Shares	Sole	2023-07-17
2023-03-31	$2,062,552	124,400	-0.4%	Shares	Sole	2023-04-20
2022-12-31	$2,102,067	124,900	-0.6%	Shares	Sole	2023-01-24
2022-09-30	$1,837,734	125,700	-3.1%	Shares	Sole	2022-10-31
2022-06-30	$2,527,530	129,750	-6.6%	Shares	Sole	2022-07-29
2022-03-31	$2,357,133	138,900	-1.2%	Shares	Sole	2022-04-26
2021-12-31	$2,650,310	140,600	-0.2%	Shares	Sole	2022-01-10
2021-09-30	$1,919,785	140,850	-0.6%	Shares	Sole	2021-10-26
2021-06-30	$1,871,196	141,650	+0.8%	Shares	Sole	2021-07-27
2021-03-31	$1,807,473	140,550	-0.4%	Shares	Sole	2021-05-06
2020-12-31	$1,575,234	141,150	+150.3%	Shares	Sole	2022-04-25
2020-09-30	$561,744	56,400	+5.2%	Shares	Sole	2020-10-23
2020-06-30	$596,568	53,600	-0.6%	Shares	Sole	2020-07-28
2020-03-31	$553,014	53,900	—	Shares	Sole	2020-04-14
No filing history on record for this holder in this stock.