Penbrook Management LLC

Position in ACLS — Axcelis Technologies Inc

CIK 1381055 NEW YORK, NY

Position in ACLS

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

Position Value

$1,125,802

-$151,202 QoQ

Shares Held

12,095

-23.9% QoQ

Ownership

0.039%

of shares outstanding

% of Portfolio

0.90%

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. ACLS ranks #3 (13.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PLAB	Photronics Inc	96,730	$3,908,859
2	AEHR	Aehr Test Systems	79,515	$2,948,416
3	ACLS	Axcelis Technologies Inc This page	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	$1,125,802	12,095	-23.9%	Shares	Sole	2026-04-21
2025-12-31	$1,277,004	15,895	-5.9%	Shares	Sole	2026-01-06
2025-09-30	$1,649,627	16,895	0.0%	Shares	Sole	2025-10-22
2025-06-30	$1,177,412	16,895	-14.0%	Shares	Sole	2025-07-28
2025-03-31	$975,518	19,640	+0.4%	Shares	Sole	2025-04-01
2024-12-31	$1,367,006	19,565	0.0%	Shares	Sole	2025-01-23
2024-09-30	$2,051,390	19,565	-14.7%	Shares	Sole	2024-10-15
2024-06-30	$3,259,705	22,925	-46.0%	Shares	Sole	2024-07-24
2024-03-31	$4,735,139	42,460	-1.3%	Shares	Sole	2024-04-18
2023-12-31	$5,581,857	43,040	-1.3%	Shares	Sole	2024-01-16
2023-09-30	$7,107,349	43,590	-2.3%	Shares	Sole	2023-10-10
2023-06-30	$8,181,101	44,625	-5.7%	Shares	Sole	2023-07-17
2023-03-31	$6,304,057	47,310	-0.8%	Shares	Sole	2023-04-20
2022-12-31	$3,783,488	47,675	0.0%	Shares	Sole	2023-01-24
2022-09-30	$2,887,198	47,675	-0.5%	Shares	Sole	2022-10-31
2022-06-30	$2,628,207	47,925	-0.5%	Shares	Sole	2022-07-29
2022-03-31	$3,636,769	48,150	-22.7%	Shares	Sole	2022-04-26
2021-12-31	$4,645,088	62,300	-2.4%	Shares	Sole	2022-01-10
2021-09-30	$3,000,514	63,800	-1.2%	Shares	Sole	2021-10-26
2021-06-30	$2,609,111	64,550	-1.9%	Shares	Sole	2021-07-27
2021-03-31	$2,703,722	65,800	-8.3%	Shares	Sole	2021-05-06
2020-12-31	$2,089,360	71,750	0.0%	Shares	Sole	2022-04-25
2020-09-30	$1,578,500	71,750	+0.2%	Shares	Sole	2020-10-23
2020-06-30	$1,994,060	71,600	-11.2%	Shares	Sole	2020-07-28
2020-03-31	$1,475,786	80,600	—	Shares	Sole	2020-04-14
No filing history on record for this holder in this stock.