ACK Asset Management LLC
In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 13, 2025), ACK Asset Management LLC reported 20 stock positions worth $609.0 million. Its top holding was Dycom Industries (DY) at 9.6% of the portfolio, followed by Enersys (ENS, 9.4%) and Mastec (MTZ, 8.9%). Compared with Q4 2024, it opened 3 new positions, sold out of 5, added to 3 and reduced 13. The biggest buy was a new position in Bird Construction (BIRDF) and the biggest sale an exit from Element Solutions (ESI).
- Most Recent 13F
- Q2 2026
- Location
- GREENWICH, CT
- CIK
- 0001510940
- Portfolio Value
- $609.0M (Q1 2025)
- SEC Filing
- 0001510940-25-000002 ↗ filed May 13, 2025
Holdings Value
Holdings 20 stocks · $609.0M
| DY Dycom Industries Inc. | 9.58% | 382,800 | $58.3M | Reduce -14.1% |
| ENS Enersys | 9.39% | 624,324 | $57.2M | Reduce -7.0% |
| MTZ Mastec Inc. | 8.87% | 462,700 | $54.0M | Reduce -13.0% |
| ATS Ats Corp. | 8.24% | 2,013,196 | $50.2M | Reduce -3.8% |
| ATRO Astronics Corp. | 8.18% | 2,060,000 | $49.8M | No change |
| JBTM JBT Marel Corp. | 7.42% | 369,800 | $45.2M | Reduce -7.5% |
| MTRN Materion Corp. | 6.15% | 459,200 | $37.5M | Reduce -7.2% |
| ROG Rogers Corp. | 5.74% | 517,500 | $34.9M | Reduce -10.8% |
| MYRG MYR Group Inc./Delaware | 5.18% | 279,100 | $31.6M | Add +39.5% |
| CECO Ceco Environmental Corp. | 4.50% | 1,201,000 | $27.4M | Reduce -5.6% |
| MIR Mirion Technologies Inc. | 3.85% | 1,618,356 | $23.5M | Reduce -10.8% |
| CLFD Clearfield Inc. | 3.35% | 687,200 | $20.4M | Reduce -4.6% |
| CTRI Centuri Holdings Inc. | 3.29% | 1,220,591 | $20.0M | Reduce -6.1% |
| MRC MRC Global Inc. | 2.95% | 1,565,000 | $18.0M | Add +184.6% |
| MBC Masterbrand Inc. | 2.79% | 1,302,500 | $17.0M | Reduce -11.7% |
| BIRDF Bird Construction Inc. | 2.79% | 1,120,800 | $17.0M | New |
| MTRX Matrix Service Co. | 2.42% | 1,184,100 | $14.7M | Add +0.4% |
| GVA Granite Construction Inc. | 2.36% | 190,700 | $14.4M | Reduce -32.9% |
| SITE Siteone Landscape Supply Inc. | 1.99% | 100,000 | $12.1M | New |
| LASR Nlight Inc. | 0.96% | 754,000 | $5.9M | New |
Portfolio Sells Q4 2024 → Q1 2025
| ESI Element Solutions Inc. | Sold out | 0.00% | −2.56 |
| ROG Rogers Corp. | Reduce -10.8% | 5.74% | −2.16 |
| NEOG Neogen Corp. | Sold out | 0.00% | −1.96 |
| APTV Aptiv PLC | Sold out | 0.00% | −1.94 |
| BWA Borgwarner Inc. | Sold out | 0.00% | −1.50 |
| GVA Granite Construction Inc. | Reduce -32.9% | 2.36% | −0.98 |
| MTZ Mastec Inc. | Reduce -13.0% | 8.87% | −0.83 |
| DY Dycom Industries Inc. | Reduce -14.1% | 9.58% | −0.81 |
| CECO Ceco Environmental Corp. | Reduce -5.6% | 4.50% | −0.65 |
| TRNS Transcat Inc. | Sold out | 0.00% | −0.64 |
| MTRN Materion Corp. | Reduce -7.2% | 6.15% | −0.40 |
| MIR Mirion Technologies Inc. | Reduce -10.8% | 3.85% | −0.39 |
| ATS Ats Corp. | Reduce -3.8% | 8.24% | −0.31 |
| MBC Masterbrand Inc. | Reduce -11.7% | 2.79% | −0.09 |
| CTRI Centuri Holdings Inc. | Reduce -6.1% | 3.29% | −0.08 |
| CLFD Clearfield Inc. | Reduce -4.6% | 3.35% | +0.36 |
| JBTM JBT Marel Corp. | Reduce -7.5% | 7.42% | +0.61 |
| ENS Enersys | Reduce -7.0% | 9.39% | +1.08 |
Portfolio Buys Q4 2024 → Q1 2025
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 21 | $856.3M | WMS, HLIO, LFUS, JHX, GTX |
| Q1 2026 | 20 | $801.1M | MTRN, WMS, ATS, ROG, HLIO |
| Q4 2025 | 23 | $796.8M | MTRN, GVA, WMS, ATS, CNM |
| Q3 2025 | 20 | $799.1M | ENS, MTRN, GVA, ATRO, WMS |
| Q2 2025 | 21 | $761.4M | ATRO, ATS, DY, GVA, ENS |
| Q1 2025 | 20 | $609.0M | DY, ENS, MTZ, ATS, ATRO |
| Q4 2024 | 22 | $746.4M | DY, MTZ, ATS, ENS, ROG |
| Q3 2024 | 18 | $809.2M | DY, MTZ, ENS, ROG, ATS |
| Q2 2024 | 19 | $810.3M | DY, MTZ, ENS, ROG, CNM |
| Q1 2024 | 20 | $858.3M | CNM, DY, ATKR, MTZ, ENS |