ACK Asset Management LLC 13F holdings, Q3 2025
Holdings as of September 30, 2025 · filings on SEC EDGAR · latest filing →
ACK Asset Management LLC disclosed 20 US equity positions worth $799.1m in its Q3 2025 13F filing. The largest position was ENS at 8.3% of the reported book, followed by MTRN and GVA. Against the Q2 2025 filing, it opened 7 new positions, added to 5 and reduced 2 among the top 20 holdings.
What did ACK Asset Management LLC own in Q3 2025? Top 20 positions
| # | Stock | Sector | Weight | Value | Shares | Δ shares | vs Q2 2025 |
|---|---|---|---|---|---|---|---|
| 1 | ENS ENS | Industrials | 8.3% | $66.0m | 584,324 | 0% | held |
| 2 | MTRN MTRN | Basic Materials | 7.9% | $63.4m | 524,800 | 0% | held |
| 3 | GVA GVA | Industrials | 7.5% | $59.8m | 545,000 | 0% | held |
| 4 | ATRO ATRO | Industrials | 7.0% | $56.1m | 1,230,000 | -40% | reduced |
| 5 | WMS WMS | Industrials | 6.8% | $54.1m | 390,000 | 13% | added |
| 6 | JBTM JBTM | Industrials | 6.2% | $49.2m | 350,546 | 0% | held |
| 7 | CNM CNM | Industrials | 6.1% | $48.4m | 900,000 | – | new |
| 8 | ATS ATS | 6.1% | $48.4m | 1,846,196 | 0% | held | |
| 9 | AIN AIN | Consumer Cyclical | 5.1% | $40.5m | 760,000 | 30% | added |
| 10 | JHX JHX | 5.0% | $40.3m | 2,100,000 | – | new | |
| 11 | HLIO HLIO | Industrials | 5.0% | $40.1m | 770,000 | – | new |
| 12 | SITE SITE | Industrials | 4.5% | $36.1m | 280,000 | 12% | added |
| 13 | ASTE ASTE | Industrials | 4.2% | $33.8m | 701,500 | – | new |
| 14 | APOG APOG | Industrials | 3.9% | $30.8m | 708,000 | – | new |
| 15 | MBC MBC | Consumer Cyclical | 3.8% | $30.3m | 2,300,000 | – | new |
| 16 | CTRI CTRI | Utilities | 3.6% | $29.1m | 1,375,000 | -32% | reduced |
| 17 | CLFD CLFD | Technology | 2.7% | $21.5m | 625,200 | 0% | held |
| 18 | EXP EXP | Basic Materials | 2.6% | $21.0m | 90,000 | – | new |
| 19 | NPKI NPKI | Industrials | 2.2% | $17.8m | 1,576,808 | 29% | added |
| 20 | CTOS CTOS | 1.5% | $12.4m | 1,925,000 | 3% | added |
Weights are shares of the reported long US equity book (options excluded). Values are as filed, normalised to whole dollars. Share changes compare against the immediately preceding filing only.