ACK Asset Management LLC

Q3 2025 13F-HR Holdings

Location
Greenwich, CT
Holdings as of
9/30/2025
Date filed
11/14/2025
Form type
13F-HR
Num holdings
20
Total value ($000)
$799,134
Net value change ($000)
+37,708 (5.0%)
New positions
7
Sold out positions
8
Turnover %
61.3%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/13/2025 Next filing: 2/13/2026 SEC filing

Snapshot: Change Analysis

Compared to Q2 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)
CNM 48,447 NEW
JHX 40,341 NEW
HLIO 40,140 NEW
ASTE 33,763 NEW
APOG 30,848 NEW
MBC 30,291 NEW
MTRN 21,748 52.2%
EXP 20,974 NEW
ENS 15,888 31.7%
WMS 14,466 36.5%
Top Reduces (Value $000, Stocks/ETFs)
DY -54,914 -100.0%
MYRG -48,121 -100.0%
RRX -39,864 -100.0%
MRC GLOBAL INC. -31,081 -100.0%
MIR -28,786 -100.0%
MTZ -21,304 -100.0%
CTRI -16,489 -36.2%
MTRX -14,687 -100.0%
ATRO -12,869 -18.7%
ATS -10,487 -17.8%
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