ACK Asset Management LLC
In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 13, 2024), ACK Asset Management LLC reported 19 stock positions worth $810.3 million. Its top holding was Dycom Industries (DY) at 11.2% of the portfolio, followed by Mastec (MTZ, 10.2%) and Enersys (ENS, 9.1%). Compared with Q1 2024, it opened 6 new positions, sold out of 7, added to 6 and reduced 3. The biggest buy was a new position in Granite Construction (GVA) and the biggest sale an exit from Atkore (ATKR).
- Most Recent 13F
- Q2 2026
- Location
- GREENWICH, CT
- CIK
- 0001510940
- Portfolio Value
- $810.3M (Q2 2024)
- SEC Filing
- 0000899140-24-000847 ↗ filed Aug 13, 2024
Holdings Value
Holdings 19 stocks · $810.3M
| DY Dycom Industries Inc. | 11.15% | 535,500 | $90.4M | No change |
| MTZ Mastec Inc. | 10.20% | 772,300 | $82.6M | No change |
| ENS Enersys | 9.13% | 715,000 | $74.0M | No change |
| ROG Rogers Corp. | 8.78% | 590,000 | $71.2M | Add +13.5% |
| CNM Core & Main Inc. Class A | 8.17% | 1,352,000 | $66.2M | No change |
| ATS Ats Corp. | 7.97% | 2,000,000 | $64.6M | Add +29.9% |
| MTRN Materion Corp. | 6.75% | 505,500 | $54.7M | Add +5.2% |
| GVA Granite Construction Inc. | 6.31% | 825,000 | $51.1M | New |
| ARRY Array Technologies Inc. | 5.42% | 4,282,000 | $43.9M | Add +62.7% |
| ATRO Astronics Corp. | 5.09% | 2,060,000 | $41.3M | Add +23.0% |
| ESI Element Solutions Inc. | 5.02% | 1,500,000 | $40.7M | New |
| MIR Mirion Technologies Inc. | 4.37% | 3,297,580 | $35.4M | New |
| CLFD Clearfield Inc. | 3.31% | 695,000 | $26.8M | Add +4.5% |
| NEOG Neogen Corp. | 3.20% | 1,659,400 | $25.9M | Reduce -19.4% |
| CECO Ceco Environmental Corp. | 2.92% | 821,200 | $23.7M | New |
| FIP Ftai Infrastructure Inc. | 1.09% | 1,025,000 | $8.8M | New |
| THRY Thryv Holdings Inc. | 0.54% | 245,000 | $4.4M | Reduce -67.9% |
| LUNA Luna Innovations Inc. | 0.31% | 779,000 | $2.5M | Reduce -36.6% |
| MDA Mda Space Ltd. filed as MDA-TC | 0.26% | 211,600 | $2.1M | New |
Portfolio Sells Q1 2024 → Q2 2024
| ATKR Atkore Inc. | Sold out | 0.00% | −8.65 |
| JBI Janus International Group Inc. | Sold out | 0.00% | −5.98 |
| ZWS Zurn Elkay Water Solutions C | Sold out | 0.00% | −4.91 |
| MDA-TC | Sold out | 0.00% | −3.74 |
| ALNT Allient Inc. | Sold out | 0.00% | −2.19 |
| TITN Titan Machinery Inc. | Sold out | 0.00% | −1.47 |
| THRY Thryv Holdings Inc. | Reduce -67.9% | 0.54% | −1.44 |
| SMRT Smartrent Inc. | Sold out | 0.00% | −1.30 |
| NEOG Neogen Corp. | Reduce -19.4% | 3.20% | −0.59 |
| LUNA Luna Innovations Inc. | Reduce -36.6% | 0.31% | −0.15 |
Portfolio Buys Q1 2024 → Q2 2024
| GVA Granite Construction Inc. | New | 6.31% | +6.31 |
| ESI Element Solutions Inc. | New | 5.02% | +5.02 |
| MIR Mirion Technologies Inc. | New | 4.37% | +4.37 |
| CECO Ceco Environmental Corp. | New | 2.92% | +2.92 |
| ATS Ats Corp. | Add +29.9% | 7.97% | +1.92 |
| ROG Rogers Corp. | Add +13.5% | 8.78% | +1.59 |
| ATRO Astronics Corp. | Add +23.0% | 5.09% | +1.38 |
| FIP Ftai Infrastructure Inc. | New | 1.09% | +1.09 |
| CLFD Clearfield Inc. | Add +4.5% | 3.31% | +0.92 |
| ARRY Array Technologies Inc. | Add +62.7% | 5.42% | +0.85 |
| MDA Mda Space Ltd. | New | 0.26% | +0.26 |
| MTRN Materion Corp. | Add +5.2% | 6.75% | −0.63 |
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 |