ACK Asset Management LLC
- SEC CIK
- 0001510940
- Latest filing
- Aug 13, 2026
Holdings in Q2 2026
Holdings as of Jun 30, 2026, filed Aug 13, 2026. Long positions only; changes compare share counts with Q1 2026.
- Positions
- 21
- +1 vs. Q1 2026
- Portfolio value
- $856.3M
- +$55.2M (+6.9%) vs. Q1 2026
| Security | Class | Shares | Value | % of portfolio | Share change | Action | History |
|---|---|---|---|---|---|---|---|
| WMSAdvanced Drainage Systems, Inc. | COM | 390,000 | $61.2M | 7.1% | 00.0% | Unchanged | History |
| HLIOHelios Technologies, Inc. | COM | 681,000 | $60.8M | 7.1% | −99,378−12.7% | Reduced | History |
| LFUSLittelfuse Inc | COM | 125,000 | $56.9M | 6.6% | −10,000−7.4% | Reduced | History |
| JHXJames Hardie Industries plc | Stock | 2,100,000 | $55.0M | 6.4% | 00.0% | Unchanged | History |
| GTXGarrett Motion Inc. | Stock | 1,500,000 | $54.3M | 6.3% | +1,500,000 | New | History |
| CNMCore & Main, Inc. | CL A | 1,090,000 | $52.6M | 6.1% | +190,000+21.1% | Added | History |
| EXPEagle Materials Inc | COM | 220,000 | $49.5M | 5.8% | +55,000+33.3% | Added | History |
| ATSATS Corp | COM | 1,500,000 | $43.2M | 5.0% | −346,196−18.8% | Reduced | History |
| ASTEAstec Industries Inc | COM | 690,276 | $42.2M | 4.9% | −96,224−12.2% | Reduced | History |
| MTRNMATERION Corp | COM | 135,000 | $40.1M | 4.7% | −339,800−71.6% | Reduced | History |
| BWABorgwarner Inc | COM | 600,000 | $39.8M | 4.7% | +600,000 | New | History |
| DNOWDNOW Inc. | COM | 3,000,000 | $38.9M | 4.5% | +3,000,000 | New | History |
| MBCMasterBrand, Inc. | COMMON STOCK | 3,700,000 | $38.1M | 4.4% | 00.0% | Unchanged | History |
| SITESiteOne Landscape Supply, Inc. | COM | 330,000 | $37.8M | 4.4% | 00.0% | Unchanged | History |
| SWIMLatham Group, Inc. | COM | 5,660,000 | $36.6M | 4.3% | +500,000+9.7% | Added | History |
| CLFDClearfield, Inc. | COM | 810,200 | $32.2M | 3.8% | +75,000+10.2% | Added | History |
| STSensata Technologies Holding plc | SHS | 600,000 | $28.6M | 3.3% | +600,000 | New | History |
| Aero-SWXH55555108 | COM | 1,082,500 | $28.5M | 3.3% | +252,500+30.4% | Added | – |
| SHLSShoals Technologies Group, Inc. | CL A | 2,255,000 | $22.3M | 2.6% | +2,255,000 | New | History |
| EQPTEquipmentShare.com Inc | COM CL A | 1,064,830 | $20.9M | 2.4% | +1,064,830 | New | History |
| MEIMethode Electronics Inc | COM | 877,500 | $16.6M | 1.9% | +877,500 | New | History |
Sold out since Q1 2026 (6)
Positions held at the end of Q1 2026 that are gone from this filing.
| Security | Class | Shares in Q1 2026 | Value in Q1 2026 | % of portfolio in Q1 2026 | History |
|---|---|---|---|---|---|
| ROGRogers Corp | COM | 475,000 | $51.0M | 6.4% | History |
| NOVTNovanta Inc | COM | 375,000 | $44.3M | 5.5% | History |
| DXPEDXP Enterprises Inc | COM NEW | 260,000 | $36.3M | 4.5% | History |
| CDNLCardinal Infrastructure Group Inc. | CL A | 874,000 | $34.7M | 4.3% | History |
| GVAGranite Construction Inc | COM | 250,000 | $30.0M | 3.7% | History |
| CTSCTS Corp | COM | 584,000 | $27.9M | 3.5% | History |