ACK Asset Management LLC

Q3 2026 13F-HR Holdings

Location
Greenwich, CT
Holdings as of
9/30/2026
Date filed
11/13/2026
Form type
13F-HR
Num holdings
20
Total value ($000)
$666,832
Net value change ($000)
-189,495 (-22.1%)
New positions
4
Sold out positions
5
Turnover %
41.8%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/13/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q2 2026
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)
DY 43,053 NEW
CTRI 28,056 NEW
MWH 27,023 NEW
DNOW 12,240 31.5%
LGN 5,905 NEW
ST 448 1.6%
Top Reduces (Value $000, Stocks/ETFs)
ATS -43,170 -100.0%
ASTE -42,238 -100.0%
MTRN -40,148 -100.0%
AERO-SWX -28,460 -100.0%
SITE -28,119 -74.5%
EQPT -20,935 -100.0%
HLIO -14,525 -23.9%
GTX -12,697 -23.4%
EXP -11,876 -24.0%
WMS -11,797 -19.3%
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