13F-HR filed by ACK Asset Management LLC
ACK Asset Management LLC filed this 13F-HR for the quarter ended 2026-06-30, filed 2026-08-13, with 21 holding rows worth $856,327,037.
- Accession
- 0001510940-26-000005
- Filer
- CIK 1510940
- Filed
- 2026-08-13
- Accepted by EDGAR
- acceptance time not in the bulk data set
- Ingested
- Source
- SEC quarterly data set
13F report for Q2 2026
A holdings report, 21 entries on the cover page, a total value of $856,327,037 stated on the cover page (in dollars after the unit check, H1), rows summing to $856,327,037 with VALUE read as dollars as filed, 13F file number 028-14060. The quarter's positions are built on this report. The resolved quarter.
The information table after summing rows of one CUSIP and put or call (H4), with the CUSIP and issuer name as filed. Values in dollars after the unit check (method).
| Issuer as filed | CUSIP | Class | Amount | Value | Value read as | Type |
|---|---|---|---|---|---|---|
| ADVANCED DRAIN SYS INC DEL COM | 00790R104 | Stock | 390,000 | $61,214,400 | dollars as filed | |
| HELIOS TECHNOLOGIES INC | 42328H109 | COM | 681,000 | $60,779,250 | dollars as filed | |
| LITTELFUSE INC COM | 537008104 | Stock | 125,000 | $56,916,250 | dollars as filed | |
| JAMES HARDIE INDS PLC ORD SHS | G4253H101 | Stock | 2,100,000 | $54,978,000 | dollars as filed | |
| GARRETT MOTION INC | 366505105 | COM | 1,500,000 | $54,345,000 | dollars as filed | |
| CORE & MAIN INC CL A | 21874C102 | Stock | 1,090,000 | $52,592,500 | dollars as filed | |
| EAGLE MATLS INC COM | 26969P108 | Stock | 220,000 | $49,500,000 | dollars as filed | |
| ATS CORPORATION | 00217Y104 | COM | 1,500,000 | $43,170,000 | dollars as filed | |
| ASTEC INDS INC | 046224101 | COM | 690,276 | $42,237,988 | dollars as filed | |
| MATERION CORP | 576690101 | COM | 135,000 | $40,147,650 | dollars as filed | |
| BORGWARNER INC COM | 099724106 | Stock | 600,000 | $39,840,000 | dollars as filed | |
| DNOW INC | 67011P100 | COMMON STOCK | 3,000,000 | $38,910,000 | dollars as filed | |
| MASTERBRAND INC | 57638P104 | COMMON STOCK | 3,700,000 | $38,073,000 | dollars as filed | |
| SITEONE LANDSCAPE SUPPLY INC | 82982L103 | COM | 330,000 | $37,755,300 | dollars as filed | |
| LATHAM GROUP INC | 51819L107 | COMMON STOCK | 5,660,000 | $36,620,200 | dollars as filed | |
| CLEARFIELD INC | 18482P103 | COMMON STOCK | 810,200 | $32,237,858 | dollars as filed | |
| SENSATA TECHNOLOGIES HLDG PL | g8060n102 | SHS | 600,000 | $28,644,000 | dollars as filed | |
| AERO-SWX | H55555108 | COM | 1,082,500 | $28,460,408 | dollars as filed | |
| SHOALS TECHNOLOGIES GROUP INC CL A | 82489W107 | Stock | 2,255,000 | $22,324,500 | dollars as filed | |
| EQUIPMENTSHARE.COM INC A | 29445S100 | COMMON STOCK | 1,064,830 | $20,934,558 | dollars as filed | |
| METHODE ELECTRONICS INC | 591520200 | COMMON STOCK | 877,500 | $16,646,175 | dollars as filed |
Amendment chain
| Filing | Role | Filed | Accepted | Ingested |
|---|---|---|---|---|
| 13F-HR 0001510940-26-000005 | this filing | 2026-08-13 | acceptance time not in the bulk data set |