ACK Asset Management LLC

Q4 2025 13F-HR Holdings

Location
Greenwich, CT
Holdings as of
12/31/2025
Date filed
2/13/2026
Form type
13F-HR
Num holdings
23
Total value ($000)
$796,757
Net value change ($000)
-2,377 (-0.3%)
New positions
6
Sold out positions
3
Turnover %
30.4%
Sector allocation + QoQ delta (equities-only)
Prev filing: 11/14/2025 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q3 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
NOVT 44,621 NEW
ROG 39,989 NEW
DXPE 26,350 NEW
CDNL 20,422 NEW
EXP 13,128 62.6%
ERII 9,136 NEW
AERO-SWX 5,527 NEW
SITE 5,041 14.0%
JHX 3,234 8.0%
ATS 2,474 5.1%
Top Reduces (Value $000, Stocks/ETFs)
JBTM -49,234 -100.0%
CTRI -29,109 -100.0%
ATRO -23,693 -42.2%
ENS -21,345 -32.3%
NPKI -17,834 -100.0%
AIN -10,088 -24.9%
CTOS -7,750 -62.7%
MBC -4,899 -16.2%
MTRN -4,374 -6.9%
CLFD -3,269 -15.2%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type