13F-HR filed by ACK Asset Management LLC
ACK Asset Management LLC filed this 13F-HR for the quarter ended 2026-03-31, filed 2026-05-15, with 20 holding rows worth $801,144,828.
- Accession
- 0001510940-26-000004
- Filer
- CIK 1510940
- Filed
- 2026-05-15
- Accepted by EDGAR
- acceptance time not in the bulk data set
- Ingested
- Source
- SEC quarterly data set
13F report for Q1 2026
A holdings report, 20 entries on the cover page, a total value of $801,144,828 stated on the cover page (in dollars after the unit check, H1), rows summing to $801,144,828 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 |
|---|---|---|---|---|---|---|
| MATERION CORP | 576690101 | COM | 474,800 | $68,679,820 | dollars as filed | |
| ADVANCED DRAIN SYS INC DEL COM | 00790R104 | Stock | 390,000 | $53,480,700 | dollars as filed | |
| ATS CORPORATION | 00217Y104 | COM | 1,846,196 | $52,062,727 | dollars as filed | |
| ROGERS CORP COM | 775133101 | Stock | 475,000 | $50,981,750 | dollars as filed | |
| HELIOS TECHNOLOGIES INC | 42328H109 | COM | 780,378 | $50,498,260 | dollars as filed | |
| LITTELFUSE INC COM | 537008104 | Stock | 135,000 | $45,812,250 | dollars as filed | |
| CORE & MAIN INC CL A | 21874C102 | Stock | 900,000 | $44,460,000 | dollars as filed | |
| NOVANTA INC | 67000B104 | COM | 375,000 | $44,291,250 | dollars as filed | |
| SITEONE LANDSCAPE SUPPLY INC | 82982L103 | COM | 330,000 | $43,926,300 | dollars as filed | |
| ASTEC INDS INC | 046224101 | COM | 786,500 | $42,345,160 | dollars as filed | |
| JAMES HARDIE INDS PLC ORD SHS | G4253H101 | Stock | 2,100,000 | $39,774,000 | dollars as filed | |
| DXP ENTERPRISES INC | 233377407 | COM NEW | 260,000 | $36,329,800 | dollars as filed | |
| CARDINAL INFRASTRUCTURE GR A | 14154A102 | COMMON STOCK | 874,000 | $34,658,470 | dollars as filed | |
| EAGLE MATLS INC COM | 26969P108 | Stock | 165,000 | $31,259,250 | dollars as filed | |
| MASTERBRAND INC | 57638P104 | COMMON STOCK | 3,700,000 | $30,747,000 | dollars as filed | |
| GRANITE CONSTR INC COM | 387328107 | Stock | 250,000 | $29,970,000 | dollars as filed | |
| CTS CORP | 126501105 | COM | 584,000 | $27,891,840 | dollars as filed | |
| LATHAM GROUP INC | 51819L107 | COMMON STOCK | 5,160,000 | $27,709,200 | dollars as filed | |
| AERO-SWX | H55555108 | COM | 830,000 | $26,806,307 | dollars as filed | |
| CLEARFIELD INC | 18482P103 | COMMON STOCK | 735,200 | $19,460,744 | dollars as filed |
Amendment chain
| Filing | Role | Filed | Accepted | Ingested |
|---|---|---|---|---|
| 13F-HR 0001510940-26-000004 | this filing | 2026-05-15 | acceptance time not in the bulk data set |