Terminal · Institutions
Every 13F-reported equity position this quarter, with its quarter-over-quarter change — each row traces back to the SEC filing.
Every 13F-reported equity position this quarter, with its quarter-over-quarter change — each row traces back to the SEC filing.
ACK Asset Management LLC (CIK 1510940) reported $801.1M across 18 reported positions in its SEC 13F filing for 2026-03-31. Largest positions: MTRN ($68.7M, 8.57%), WMS ($53.5M, 6.68%), ATS ($52.1M, 6.50%), ROG ($51.0M, 6.36%), HLIO ($50.5M, 6.30%). Source: SEC Form 13F.
| Rank | Ticker | Company | Value | % Portfolio | Shares | Action |
|---|---|---|---|---|---|---|
| 1 | MTRN | MTRN | $68.7M | 8.57% | 474,800 | Hold |
| 2 | WMS | WMS | $53.5M | 6.68% | 390,000 | Hold |
| 3 | ATS | ATS | $52.1M | 6.50% | 1.8M | Hold |
| 4 | ROG | ROG | $51.0M | 6.36% | 475,000 | Added |
| 5 | HLIO | HLIO | $50.5M | 6.30% | 780,378 | Hold |
| 6 | LFUS | LFUS | $45.8M | 5.72% | 135,000 | New |
| 7 | CNM | CNM | $44.5M | 5.55% | 900,000 | Hold |
| 8 | NOVT | NOVT | $44.3M | 5.53% | 375,000 | Hold |
| 9 | SITE | SITE | $43.9M | 5.48% | 330,000 | Hold |
| 10 | ASTE | ASTE | $42.3M | 5.29% | 786,500 | Hold |
| 11 | JHX | JHX | $39.8M | 4.96% | 2.1M | Hold |
| 12 | DXPE | DXPE | $36.3M | 4.53% | 260,000 | Added |
| 13 | CDNL | $34.7M | 4.33% | 874,000 | Added | |
| 14 | EXP | EXP | $31.3M | 3.90% | 165,000 | Hold |
| 15 | MBC | MBC | $30.7M | 3.84% | 3.7M | Added |
| 16 | GVA | GVA | $30.0M | 3.74% | 250,000 | Trimmed |
| 17 | CTS | CTS | $27.9M | 3.48% | 584,000 | New |
| 18 | SWIM | SWIM | $27.7M | 3.46% | 5.2M | New |
| 19 | AERO-SWX | $26.8M | 3.35% | 830,000 | Added | |
| 20 | CLFD | CLFD | $19.5M | 2.43% | 735,200 | Added |
| 21 | AIN | AIN | $0 | 0.00% | 0 | Exited |
| 22 | APOG | APOG | $0 | 0.00% | 0 | Exited |
| 23 | ATRO | ATRO | $0 | 0.00% | 0 | Exited |
| 24 | CTOS | CTOS | $0 | 0.00% | 0 | Exited |
| 25 | ERII | ERII | $0 | 0.00% | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31