ACK Asset Management LLC
Net seller this quarter
$856M
20
-$223M
60.2%
Holdings
| Company | Value | % of portfolio | % of company | POSITION CHANGE qoq % | First reported |
|---|---|---|---|---|---|
| Q2 2026 | |||||
 WMS | $61.2M | 7.15% | 0.55% | Not reported | Q3 2014 |
 HLIO | $60.8M | 7.10% | 2.06% | -12.7% | Q2 2020 |
 LFUS | $56.9M | 6.65% | 0.49% | -7.4% | Q1 2026 |
 JHX | $55M | 6.42% | 0.36% | Not reported | Q3 2025 |
 GTX | $54.3M | 6.35% | 0.80% | New | Q2 2026 |
 CNM | $52.6M | 6.14% | Not reported | +21.1% | Q1 2023 |
 EXP | $49.5M | 5.78% | 0.71% | +33.3% | Q2 2015 |
 ATS | $43.2M | 5.04% | 1.53% | -18.8% | Q4 2022 |
 ASTE | $42.2M | 4.93% | 3.00% | -12.2% | Q2 2014 |
 MTRN | $40.1M | 4.69% | 0.65% | -71.6% | Q2 2013 |
 BWA | $39.8M | 4.65% | 0.29% | Not reported | Q4 2024 |
 DNOW | $38.9M | 4.54% | 1.66% | New | Q2 2026 |
 MBC | $38.1M | 4.45% | 1.82% | Not reported | Q3 2024 |
 SITE | $37.8M | 4.41% | 0.75% | Not reported | Q1 2025 |
 SWIM | $36.6M | 4.28% | 4.82% | +9.7% | Q4 2021 |
 CLFD | $32.2M | 3.76% | 5.96% | +10.2% | Q4 2023 |
 ST | $28.6M | 3.34% | 0.41% | Not reported | Q2 2013 |
 SHLS | $22.3M | 2.61% | Not reported | New | Q2 2026 |
 EQPT | $20.9M | 2.44% | 1.35% | New | Q2 2026 |
 MEI | $16.6M | 1.94% | 2.47% | Not reported | Q2 2016 |
| Q1 2026 | |||||
| MTRN | $68.7M | 8.57% | 2.29% | Not reported | Q2 2013 |
| WMS | $53.5M | 6.68% | 0.54% | Not reported | Q3 2014 |
| ATS | $52.1M | 6.50% | 1.88% | Not reported | Q4 2022 |
 ROG | $51M | 6.36% | 2.67% | +8.8% | Q3 2013 |
| HLIO | $50.5M | 6.30% | 2.36% | Not reported | Q2 2020 |
| LFUS | $45.8M | 5.72% | 0.54% | New | Q1 2026 |
| CNM | $44.5M | 5.55% | Not reported | Not reported | Q1 2023 |
 NOVT | $44.3M | 5.53% | 1.05% | Not reported | Q4 2025 |
| SITE | $43.9M | 5.48% | 0.74% | Not reported | Q1 2025 |
| ASTE | $42.3M | 5.29% | 3.42% | Not reported | Q2 2014 |
| JHX | $39.8M | 4.96% | 0.36% | Not reported | Q3 2025 |
 DXPE | $36.3M | 4.53% | 1.68% | +8.3% | Q2 2025 |
 CDNL | $34.7M | 4.33% | Not reported | +3.5% | Q4 2025 |
| EXP | $31.3M | 3.90% | 0.53% | Not reported | Q2 2015 |
| MBC | $30.7M | 3.84% | 2.89% | +60.9% | Q3 2024 |
 GVA | $30M | 3.74% | 0.57% | -50.0% | Q2 2024 |
 CTS | $27.9M | 3.48% | 2.04% | Not reported | Q4 2022 |
| SWIM | $27.7M | 3.46% | 4.39% | Not reported | Q4 2021 |
| CLFD | $19.5M | 2.43% | 5.40% | +17.6% | Q4 2023 |
| Q4 2025 | |||||
| MTRN | $59M | 7.41% | 2.29% | -9.5% | Q2 2013 |
| GVA | $57.7M | 7.24% | 1.15% | -8.3% | Q2 2024 |
| WMS | $56.5M | 7.09% | 0.53% | Not reported | Q3 2014 |
| ATS | $50.8M | 6.38% | 1.91% | Not reported | Q4 2022 |
| CNM | $46.8M | 5.87% | Not reported | Not reported | Q1 2023 |
 ENS | $44.7M | 5.61% | 0.83% | -47.9% | Q1 2018 |
| NOVT | $44.6M | 5.60% | 1.05% | New | Q4 2025 |
| JHX | $43.6M | 5.47% | 0.49% | Not reported | Q3 2025 |
| HLIO | $41.7M | 5.24% | 2.36% | +1.4% | Q2 2020 |
| SITE | $41.1M | 5.16% | 0.74% | +17.9% | Q1 2025 |
| ROG | $40M | 5.02% | 2.45% | Not reported | Q3 2013 |
| EXP | $34.1M | 4.28% | 0.52% | +83.3% | Q2 2015 |
| ASTE | $34.1M | 4.28% | 3.44% | +12.1% | Q2 2014 |
 ATRO | $32.4M | 4.07% | 1.85% | -51.4% | Q2 2013 |
 AIN | $30.4M | 3.82% | 2.09% | -21.1% | Q2 2025 |
 APOG | $29.6M | 3.72% | 3.78% | +14.8% | Q3 2025 |
| DXPE | $26.3M | 3.31% | 1.55% | Not reported | Q2 2025 |
| MBC | $25.4M | 3.19% | 1.81% | Not reported | Q3 2024 |
| CDNL | $20.4M | 2.56% | Not reported | New | Q4 2025 |
| CLFD | $18.2M | 2.29% | 4.52% | Not reported | Q4 2023 |
 ERII | $9.14M | 1.15% | 1.28% | Not reported | Q2 2022 |
 CTOS | $4.61M | 0.58% | 0.35% | -58.4% | Q2 2025 |
| Q3 2025 | |||||
| ENS | $66M | 8.26% | 1.57% | Not reported | Q1 2018 |
| MTRN | $63.4M | 7.93% | 2.53% | Not reported | Q2 2013 |
| GVA | $59.8M | 7.48% | 1.25% | Not reported | Q2 2024 |
| ATRO | $56.1M | 7.02% | 3.81% | -40.3% | Q2 2013 |
| WMS | $54.1M | 6.77% | 0.54% | +13.0% | Q3 2014 |
 JBTM | $49.2M | 6.16% | 0.67% | Not reported | Q4 2020 |
| CNM | $48.4M | 6.06% | Not reported | Not reported | Q1 2023 |
| ATS | $48.4M | 6.05% | 1.91% | Not reported | Q4 2022 |
| AIN | $40.5M | 5.07% | 2.58% | +29.9% | Q2 2025 |
| JHX | $40.3M | 5.05% | 0.49% | New | Q3 2025 |
| HLIO | $40.1M | 5.02% | 2.33% | Not reported | Q2 2020 |
| SITE | $36.1M | 4.51% | 0.63% | +12.0% | Q1 2025 |
| ASTE | $33.8M | 4.22% | 3.07% | Not reported | Q2 2014 |
| APOG | $30.8M | 3.86% | 3.29% | New | Q3 2025 |
| MBC | $30.3M | 3.79% | 1.82% | Not reported | Q3 2024 |
 CTRI | $29.1M | 3.64% | 1.55% | -32.3% | Q4 2024 |
| CLFD | $21.5M | 2.69% | 4.52% | Not reported | Q4 2023 |
| EXP | $21M | 2.62% | 0.28% | Not reported | Q2 2015 |
 NPKI | $17.8M | 2.23% | 1.87% | +28.5% | Q2 2025 |
| CTOS | $12.4M | 1.55% | 0.85% | +2.7% | Q2 2025 |