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ACK Asset Management LLC
Period ended Jun 30, 2026 · Latest filing Aug 13, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Jun 30, 2026: $856,327,037
More quarters will appear as history becomes available.
Top holdings
Top 10 at Jun 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- WMS · COM · 00790R104 · shares: $61,214,400
- HLIO · COM · 42328H109 · shares: $60,779,250
- LFUS · COM · 537008104 · shares: $56,916,250
- JHX · COM · G4253H101 · shares: $54,978,000
- GTX · COM · 366505105 · shares: $54,345,000
- CNM · COM · 21874C102 · shares: $52,592,500
- EXP · COM · 26969P108 · shares: $49,500,000
- ATS · COM · 00217Y104 · shares: $43,170,000
- ASTE · COM · 046224101 · shares: $42,237,988
- MTRN · COM · 576690101 · shares: $40,147,650
Reported holdings
21 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| WMS | COM | 00790R104 | — | 390,000 shares | $61,214,400 |
| HLIO | COM | 42328H109 | — | 681,000 shares | $60,779,250 |
| LFUS | COM | 537008104 | — | 125,000 shares | $56,916,250 |
| JHX | COM | G4253H101 | — | 2,100,000 shares | $54,978,000 |
| GTX | COM | 366505105 | — | 1,500,000 shares | $54,345,000 |
| CNM | COM | 21874C102 | — | 1,090,000 shares | $52,592,500 |
| EXP | COM | 26969P108 | — | 220,000 shares | $49,500,000 |
| ATS | COM | 00217Y104 | — | 1,500,000 shares | $43,170,000 |
| ASTE | COM | 046224101 | — | 690,276 shares | $42,237,988 |
| MTRN | COM | 576690101 | — | 135,000 shares | $40,147,650 |
| BWA | COM | 099724106 | — | 600,000 shares | $39,840,000 |
| DNOW | COM | 67011P100 | — | 3,000,000 shares | $38,910,000 |
| MBC | COM | 57638P104 | — | 3,700,000 shares | $38,073,000 |
| SITE | COM | 82982L103 | — | 330,000 shares | $37,755,300 |
| SWIM | COM | 51819L107 | — | 5,660,000 shares | $36,620,200 |
| CLFD | COM | 18482P103 | — | 810,200 shares | $32,237,858 |
| ST | COM | G8060N102 | — | 600,000 shares | $28,644,000 |
| AERO-SWX | COM | H55555108 | — | 1,082,500 shares | $28,460,408 |
| SHLS | COM | 82489W107 | — | 2,255,000 shares | $22,324,500 |
| EQPT | COM | 29445S100 | — | 1,064,830 shares | $20,934,558 |
| MEI | COM | 591520200 | — | 877,500 shares | $16,646,175 |