ACK Asset Management LLC
In its 13F for Q4 2024 (holdings as of December 31, 2024, filed February 13, 2025), ACK Asset Management LLC reported 22 stock positions worth $746.4 million. Its top holding was Dycom Industries (DY) at 10.4% of the portfolio, followed by Mastec (MTZ, 9.7%) and Ats (ATS, 8.5%). Compared with Q3 2024, it opened 7 new positions, sold out of 3, added to 4 and reduced 10. The biggest buy was a new position in JBT Marel (JBTM) and the biggest sale Granite Construction (GVA, shares −66%).
- Most Recent 13F
- Q2 2026
- Location
- GREENWICH, CT
- CIK
- 0001510940
- Portfolio Value
- $746.4M (Q4 2024)
- SEC Filing
- 0000899140-25-000241 ↗ filed Feb 13, 2025
Holdings Value
Holdings 22 stocks · $746.4M
| DY Dycom Industries Inc. | 10.39% | 445,500 | $77.5M | Reduce -16.8% |
| MTZ Mastec Inc. | 9.70% | 531,800 | $72.4M | Reduce -31.1% |
| ATS Ats Corp. | 8.55% | 2,093,196 | $63.8M | Reduce -7.2% |
| ENS Enersys | 8.31% | 671,024 | $62.0M | Reduce -6.2% |
| ROG Rogers Corp. | 7.90% | 580,000 | $58.9M | Reduce -1.7% |
| JBTM JBT Marel Corp. filed as JOHN BEAN TECHNOLOGIES CORP | 6.81% | 400,000 | $50.8M | New |
| MTRN Materion Corp. | 6.55% | 494,800 | $48.9M | Reduce -2.1% |
| CECO Ceco Environmental Corp. | 5.15% | 1,272,000 | $38.5M | Add +29.6% |
| ATRO Astronics Corp. | 4.40% | 2,060,000 | $32.9M | No change |
| MIR Mirion Technologies Inc. | 4.24% | 1,815,000 | $31.7M | Reduce -57.3% |
| MYRG MYR Group Inc./Delaware | 3.99% | 200,000 | $29.8M | New |
| CTRI Centuri Holdings Inc. | 3.36% | 1,300,000 | $25.1M | New |
| GVA Granite Construction Inc. | 3.34% | 284,000 | $24.9M | Reduce -65.6% |
| CLFD Clearfield Inc. | 2.99% | 720,000 | $22.3M | Add +3.6% |
| MBC Masterbrand Inc. | 2.89% | 1,475,000 | $21.5M | Add +126.9% |
| ESI Element Solutions Inc. | 2.56% | 750,000 | $19.1M | Reduce -62.3% |
| NEOG Neogen Corp. | 1.96% | 1,206,796 | $14.7M | Reduce -27.3% |
| APTV Aptiv PLC | 1.94% | 240,000 | $14.5M | New |
| MTRX Matrix Service Co. | 1.89% | 1,179,901 | $14.1M | Add +47.3% |
| BWA Borgwarner Inc. | 1.50% | 351,400 | $11.2M | New |
| MRC MRC Global Inc. | 0.94% | 550,000 | $7.0M | New |
| TRNS Transcat Inc. | 0.64% | 45,000 | $4.8M | New |
Portfolio Sells Q3 2024 → Q4 2024
| GVA Granite Construction Inc. | Reduce -65.6% | 3.34% | −4.75 |
| ESI Element Solutions Inc. | Reduce -62.3% | 2.56% | −4.12 |
| PRIM Primoris Services Corp. | Sold out | 0.00% | −2.80 |
| DY Dycom Industries Inc. | Reduce -16.8% | 10.39% | −2.65 |
| MTZ Mastec Inc. | Reduce -31.1% | 9.70% | −2.05 |
| MIR Mirion Technologies Inc. | Reduce -57.3% | 4.24% | −1.57 |
| CALX Calix Inc. | Sold out | 0.00% | −1.54 |
| NEOG Neogen Corp. | Reduce -27.3% | 1.96% | −1.48 |
| ENS Enersys | Reduce -6.2% | 8.31% | −0.71 |
| MTRN Materion Corp. | Reduce -2.1% | 6.55% | −0.43 |
| ROG Rogers Corp. | Reduce -1.7% | 7.90% | −0.34 |
| LUNA Luna Innovations Inc. | Sold out | 0.00% | −0.15 |
| ATS Ats Corp. | Reduce -7.2% | 8.55% | +0.45 |
Portfolio Buys Q3 2024 → Q4 2024
| JBTM JBT Marel Corp. | New | 6.81% | +6.81 |
| MYRG MYR Group Inc./Delaware | New | 3.99% | +3.99 |
| CTRI Centuri Holdings Inc. | New | 3.36% | +3.36 |
| APTV Aptiv PLC | New | 1.94% | +1.94 |
| CECO Ceco Environmental Corp. | Add +29.6% | 5.15% | +1.73 |
| BWA Borgwarner Inc. | New | 1.50% | +1.50 |
| MBC Masterbrand Inc. | Add +126.9% | 2.89% | +1.40 |
| MRC MRC Global Inc. | New | 0.94% | +0.94 |
| MTRX Matrix Service Co. | Add +47.3% | 1.89% | +0.75 |
| TRNS Transcat Inc. | New | 0.64% | +0.64 |
| CLFD Clearfield Inc. | Add +3.6% | 2.99% | −0.36 |
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 |