ACK Asset Management LLC

· CIK 0001510940

13F Portfolio $801.1B AUM 20 positions Filed May 15, 2026 EDGAR ↗ ← All Funds

#	Ticker	Company	Sector	Shares	Value	% Port	Chg Shares	Chg %	Period Price ①	Since Period ①
1	MTRN	MTRN	Basic Materials	474,800	$68.7M	8.57%	NEW	—	$144.65	+45.9%
2	—	WMS	—	390,000	$53.5M	6.68%	NEW	—	$137.13	—
3	ATS	ATS	Industrials	1,846,196	$52.1M	6.50%	NEW	—	$28.20	+13.5%
4	ROG	ROG	Technology	475,000	$51.0M	6.36%	NEW	—	$107.33	+33.1%
5	HLIO	HLIO	Industrials	780,378	$50.5M	6.30%	NEW	—	$64.71	+20.8%
6	LFUS	LFUS	Technology	135,000	$45.8M	5.72%	NEW	—	$339.35	+35.6%
7	CNM	CNM	Industrials	900,000	$44.5M	5.55%	NEW	—	$49.40	-2.8%
8	NOVT	NOVT	Technology	375,000	$44.3M	5.53%	NEW	—	$118.11	+31.8%
9	SITE	SITE	Industrials	330,000	$43.9M	5.48%	NEW	—	$133.11	-8.6%
10	ASTE	ASTE	Industrials	786,500	$42.3M	5.29%	NEW	—	$53.84	-12.6%
11	—	JHX	—	2,100,000	$39.8M	4.96%	NEW	—	$18.94	—
12	DXPE	DXPE	Industrials	260,000	$36.3M	4.54%	NEW	—	$139.73	+9.2%
13	CDNL	CDNL	Industrials	874,000	$34.7M	4.33%	NEW	—	$39.66	+31.5%
14	—	EXP	—	165,000	$31.3M	3.90%	NEW	—	$189.45	—
15	MBC	MBC	Consumer Cyclical	3,700,000	$30.7M	3.84%	NEW	—	$8.31	-13.8%
16	GVA	GVA	Industrials	250,000	$30.0M	3.74%	NEW	—	$119.88	+17.6%
17	CTS	CTS	Technology	584,000	$27.9M	3.48%	NEW	—	$47.76	+28.3%
18	SWIM	SWIM	Industrials	5,160,000	$27.7M	3.46%	NEW	—	$5.37	-8.6%
19	—	AERO-SWX	—	830,000	$26.8M	3.35%	NEW	—	$32.30	—
20	CLFD	CLFD	Technology	735,200	$19.5M	2.43%	NEW	—	$26.47	+64.3%

① Period Price is the implied market price on the last day of the reporting period, calculated as reported value ÷ shares held. It is not the fund's purchase price or cost basis — the fund may have initiated or added to the position at any point during the quarter at a different price. Since Period shows the price change from that quarter-end snapshot to today's last price — it reflects stock movement after the report date, not the fund's actual return.

Sector Allocation

Industrials 55.7%

Technology 29.0%

Basic Materials 10.6%

Consumer Cyclical 4.7%