ACK Asset Management LLC
In its 13F for Q1 2024 (holdings as of March 31, 2024, filed May 14, 2024), ACK Asset Management LLC reported 20 stock positions worth $858.3 million. Its top holding was Core & Main Class A (CNM) at 9.0% of the portfolio, followed by Dycom Industries (DY, 9.0%) and Atkore (ATKR, 8.6%). Compared with Q4 2023, it sold out of 1, added to 7 and reduced 6. The biggest buy was Atkore (ATKR, shares +8%) and the biggest sale an exit from Emcor (EME).
- Most Recent 13F
- Q2 2026
- Location
- GREENWICH, CT
- CIK
- 0001510940
- Portfolio Value
- $858.3M (Q1 2024)
- SEC Filing
- 0000899140-24-000588 ↗ filed May 14, 2024
Holdings Value
Holdings 20 stocks · $858.3M
| CNM Core & Main Inc. Class A | 9.02% | 1,352,000 | $77.4M | No change |
| DY Dycom Industries Inc. | 8.95% | 535,500 | $76.9M | No change |
| ATKR Atkore Inc. | 8.65% | 390,000 | $74.2M | Add +8.3% |
| MTZ Mastec Inc. | 8.39% | 772,300 | $72.0M | No change |
| ENS Enersys | 7.87% | 715,000 | $67.5M | Add +24.9% |
| MTRN Materion Corp. | 7.38% | 480,500 | $63.3M | No change |
| ROG Rogers Corp. | 7.19% | 520,000 | $61.7M | Add +26.8% |
| ATS Ats Corp. | 6.05% | 1,540,000 | $51.9M | Add +18.0% |
| JBI Janus International Group Inc. | 5.98% | 3,394,400 | $51.4M | No change |
| ZWS Zurn Elkay Water Solutions C | 4.91% | 1,260,000 | $42.2M | Reduce -25.9% |
| ARRY Array Technologies Inc. | 4.57% | 2,631,600 | $39.2M | Add +19.0% |
| NEOG Neogen Corp. | 3.79% | 2,059,400 | $32.5M | No change |
| MDA-TC | 3.74% | 2,950,000 | $32.1M | No change |
| ATRO Astronics Corp. | 3.72% | 1,675,000 | $31.9M | Add +9.6% |
| CLFD Clearfield Inc. | 2.39% | 665,000 | $20.5M | Add +48.5% |
| ALNT Allient Inc. | 2.19% | 527,000 | $18.8M | Reduce -24.7% |
| THRY Thryv Holdings Inc. | 1.97% | 762,288 | $16.9M | Reduce -19.4% |
| TITN Titan Machinery Inc. | 1.47% | 510,000 | $12.7M | Reduce -22.7% |
| SMRT Smartrent Inc. | 1.30% | 4,170,000 | $11.2M | Reduce -31.4% |
| LUNA Luna Innovations Inc. | 0.46% | 1,229,000 | $3.9M | Reduce -34.3% |
Portfolio Sells Q4 2023 → Q1 2024
| EME Emcor Group Inc. | Sold out | 0.00% | −4.66 |
| ZWS Zurn Elkay Water Solutions C | Reduce -25.9% | 4.91% | −1.10 |
| LUNA Luna Innovations Inc. | Reduce -34.3% | 0.46% | −1.04 |
| SMRT Smartrent Inc. | Reduce -31.4% | 1.30% | −1.03 |
| TITN Titan Machinery Inc. | Reduce -22.7% | 1.47% | −0.82 |
| ALNT Allient Inc. | Reduce -24.7% | 2.19% | −0.35 |
| THRY Thryv Holdings Inc. | Reduce -19.4% | 1.97% | −0.34 |
Portfolio Buys Q4 2023 → Q1 2024
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 |