Institutional
ACK Asset Management LLC
CIK 0001510940
$801.1M
Reported AUM
20
Positions
Q1 2026
Period
2026-05-15
Filed
The Brief · ACK Asset Management LLC · Q1 2026
AI · grounded in 13F
ACK Asset Management LLC exited its position in ENS, reducing its exposure by $44.7M. The fund established three new positions, led by a $45.8M investment in LFUS, followed by entries into CTS at $27.9M and SWIM at $27.7M. Other notable exits included closing positions in ATRO for $32.4M and AIN for $30.4M.
Portfolio · Q1 2026
Top holdings
| # | Stock | Issuer | Price | Day % | 1Y Gr. | 5Y Gr. | Value | % of book | Δ shares (QoQ) | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | MTRN | MTRN | $208.11 | 9.91% | 80.93% | 165.45% | $68.7M | 8.57% | — | HELD |
| 2 | WMS | WMS | $137.57 | -0.54% | 20.87% | 22.54% | $53.5M | 6.68% | — | HELD |
| 3 | ATS | ATS | $26.79 | 1.09% | -10.25% | -26.01% | $52.1M | 6.50% | — | HELD |
| 4 | ROG | ROG | $122.14 | 4.58% | 81.49% | -42.50% | $51.0M | 6.36% | — | HELD |
| 5 | HLIO | HLIO | $77.71 | 3.85% | 120.75% | -1.46% | $50.5M | 6.30% | — | HELD |
| 6 | LFUS | LFUS | $442.00 | 7.68% | 78.47% | 62.88% | $45.8M | 5.72% | — | HELD |
| 7 | CNM | CNM | $43.53 | 2.74% | -32.40% | 54.47% | $44.5M | 5.55% | — | HELD |
| 8 | NOVT | NOVT | $138.91 | 0.83% | 14.71% | -10.08% | $44.3M | 5.53% | — | HELD |
| 9 | SITE | SITE | $94.96 | 1.25% | -30.87% | -52.89% | $43.9M | 5.48% | — | HELD |
| 10 | ASTE | ASTE | $51.40 | 0.78% | 37.05% | -10.93% | $42.3M | 5.29% | — | HELD |
| 11 | JHX | JHX | $26.47 | 1.07% | 1.20% | -30.60% | $39.8M | 4.96% | — | HELD |
| 12 | DXPE | DXPE | $154.78 | 4.45% | 34.68% | 394.26% | $36.3M | 4.53% | — | HELD |
| 13 | CDNL | CDNL | $62.96 | 7.09% | 112.34% | 149.94% | $34.7M | 4.33% | — | HELD |
| 14 | EXP | EXP | $205.48 | -2.11% | -6.35% | 34.79% | $31.3M | 3.90% | — | HELD |
| 15 | MBC | MBC | $8.15 | -3.89% | -24.07% | -8.80% | $30.7M | 3.84% | — | HELD |
| 16 | GVA | GVA | $114.92 | -2.51% | 25.06% | 198.31% | $30.0M | 3.74% | — | HELD |
| 17 | CTS | CTS | $62.70 | 1.90% | 63.66% | 82.11% | $27.9M | 3.48% | — | HELD |
| 18 | SWIM | SWIM | $5.38 | -4.27% | -19.94% | -75.51% | $27.7M | 3.46% | — | HELD |
| 19 | MTASF | AERO-SWX | $29.71 | 0.00% | -15.11% | 64.60% | $26.8M | 3.35% | — | HELD |
| 20 | CLFD | CLFD | $30.89 | 4.68% | -24.31% | -31.83% | $19.5M | 2.43% | — | HELD |
Source: SEC EDGAR · accession 0001510940-26-000004. 13F discloses long positions only — shorts, foreign equities, and options are excluded.