ACK Asset Management LLC - Stock Holdings in 13F Filings (SEC)

Updated on March 15, 2026.

Based on 13F Filings filed with the SEC on February 13, 2026, for the 2025 Q4 period, ACK Asset Management LLC held in its portfolio 23 assets valued at $796,756,840 (i.e. $796.76M).

The most valuable assets in the portfolio included: MTRN ($59.03M), GVA ($57.68M), and WMS ($56.48M).

The chart below shows the top 10 valuable assets, and the table below shows the top 23 valuable assets.

You can see similar for other investment managers.

Related Topics: SEC Topic List.

Data Source: SEC.

Top Valuable Stocks in ACK Asset Management LLC Portfolio

MTRN

GVA

WMS

ATS

CNM

ENS

NOVT

JHX

HLIO

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ACK Asset Management LLC - Stock Holdings in 13F Filings (SEC)

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Name of Issuer	No. of Shares	Value ($)	Class
MTRN	474800	59027136	COM
GVA	500000	57675000	COM
WMS	390000	56483700	COM
ATS	1846196	50844238	COM
CNM	900000	46773000	COM
ENS	304324	44659547	COM
NOVT	375000	44621250	COM
JHX	2100000	43575000	COM
HLIO	780378	41742419	COM
SITE	330000	41104800	COM
ROG	436707	39989260	COM
EXP	165000	34102200	COM
ASTE	786500	34071180	COM
ATRO	597469	32406719	COM
AIN	600000	30420000	COM
APOG	813000	29601330	COM
DXPE	240000	26349600	COM
MBC	2300000	25392000	COM
CDNL	844591	20422210	COM
CLFD	625200	18224580	COM
ERII	677251	9136116	COM
AERO-SWX	154851	5526772	COM
CTOS	800136	4608783	COM