ACK Asset Management LLC
Holdings as of 2026-06-30, filed 2026-08-13
This is history, not a current position. These holdings describe 2026-06-30, and the report became public 44 days later. The portfolio has changed since.
Aggregates
computed from the positions belowPositions reported
21
Value reported by manager
$856.3M
Sum of our stored positions
$856.3M
should match the line above
Disclosure lag
44 d
quarter end to filing
Top 5 concentration
33.7%
of the positions shown
New positions
0
vs previous quarter
Exited
0
vs previous quarter
Option positions
0
puts and calls
Positions
21 largest shown| Issuer | Class | Value | Shares | Type | CUSIP |
|---|---|---|---|---|---|
| WMS | COM | $61.2M | 390,000 | — | 00790R104 |
| HLIO | COM | $60.8M | 681,000 | — | 42328H109 |
| LFUS | COM | $56.9M | 125,000 | — | 537008104 |
| JHX | COM | $55M | 2,100,000 | — | G4253H101 |
| GTX | COM | $54.3M | 1,500,000 | — | 366505105 |
| CNM | COM | $52.6M | 1,090,000 | — | 21874C102 |
| EXP | COM | $49.5M | 220,000 | — | 26969P108 |
| ATS | COM | $43.2M | 1,500,000 | — | 00217Y104 |
| ASTE | COM | $42.2M | 690,276 | — | 046224101 |
| MTRN | COM | $40.1M | 135,000 | — | 576690101 |
| BWA | COM | $39.8M | 600,000 | — | 099724106 |
| DNOW | COM | $38.9M | 3,000,000 | — | 67011P100 |
| MBC | COM | $38.1M | 3,700,000 | — | 57638P104 |
| SITE | COM | $37.8M | 330,000 | — | 82982L103 |
| SWIM | COM | $36.6M | 5,660,000 | — | 51819L107 |
| CLFD | COM | $32.2M | 810,200 | — | 18482P103 |
| ST | COM | $28.6M | 600,000 | — | G8060N102 |
| AERO-SWX | COM | $28.5M | 1,082,500 | — | H55555108 |
| SHLS | COM | $22.3M | 2,255,000 | — | 82489W107 |
| EQPT | COM | $20.9M | 1,064,830 | — | 29445S100 |
| MEI | COM | $16.6M | 877,500 | — | 591520200 |
Values are shown exactly as filed. Before 2023 managers reported in thousands of dollars and afterwards in whole dollars; the reporting unit is not always determinable from the document, so nothing is converted automatically.
Source: U.S. Securities and Exchange Commission, Form 13F · as of 2026-08-13