ACK Asset Management LLC
CIK: 0001510940Latest portfolio: $796.8M · Q4 2025
Holdings
23
Total Value
$796.8M
New Positions
5
Closed Positions
3
Top Holdings
| # | Stock | Shares | Value | % Portfolio | Change | Type |
|---|---|---|---|---|---|---|
| 1 | MTRNMTRN | 474,800 | $59.0M | 7.41% | -50,000 | |
| 2 | GVAGVA | 500,000 | $57.7M | 7.24% | -45,000 | |
| 3 | WMSWMS | 390,000 | $56.5M | 7.09% | — | |
| 4 | ATSATS | 1,846,196 | $50.8M | 6.38% | — | |
| 5 | CNMCNM | 900,000 | $46.8M | 5.87% | — | |
| 6 | ENSENS | 304,324 | $44.7M | 5.61% | -280,000 | |
| 7 | 1GSNNOVT | 375,000 | $44.6M | 5.60% | NEW | |
| 8 | JHXJHX | 2,100,000 | $43.6M | 5.47% | — | |
| 9 | HLIOHLIO | 780,378 | $41.7M | 5.24% | +10K | |
| 10 | SITESITE | 330,000 | $41.1M | 5.16% | +50K | |
| 11 | RG6ROG | 436,707 | $40.0M | 5.02% | NEW | |
| 12 | EXPEXP | 165,000 | $34.1M | 4.28% | +75K | |
| 13 | ASTEASTE | 786,500 | $34.1M | 4.28% | +85K | |
| 14 | ATROATRO | 597,469 | $32.4M | 4.07% | -632,531 | |
| 15 | AINAIN | 600,000 | $30.4M | 3.82% | -160,000 | |
| 16 | APOGAPOG | 813,000 | $29.6M | 3.72% | +105K | |
| 17 | DXPEDXPE | 240,000 | $26.3M | 3.31% | NEW | |
| 18 | MBCMBC | 2,300,000 | $25.4M | 3.19% | — | |
| 19 | CDNLCDNL | 844,591 | $20.4M | 2.56% | NEW | |
| 20 | CLFDCLFD | 625,200 | $18.2M | 2.29% | — | |
| 21 | ERIIERII | 677,251 | $9.1M | 1.15% | NEW | |
| 22 | —AERO-SWX | 154,851 | $5.5M | 0.69% | NEW | |
| 23 | CTOSCTOS | 800,136 | $4.6M | 0.58% | -1,124,864 |
Quarterly Changes
Sector Breakdown
Industrials0.0% ($5.767556483508444e+58T)
Basic Materials0.0% ($590274.4T)
Unknown0.0% ($44621.4T)
Consumer Cyclical0.0% ($3.0T)
Technology0.0% ($18.2M)
Filing History
| Quarter | Filing Date | Portfolio Value | Holdings |
|---|---|---|---|
| Q4 2025 | Feb 13, 2026 | $796.8M | 23 |
| Q3 2025 | Nov 14, 2025 | $799.1B | 20 |
| Q2 2025 | Aug 13, 2025 | $761.4B | 0 |
| Q1 2025 | May 13, 2025 | $609.0B | 20 |
| Q4 2024 | Feb 13, 2025 | $746.4B | 22 |
| Q3 2024 | Nov 13, 2024 | $809.2B | 18 |
| Q2 2024 | Aug 13, 2024 | $810.3B | 19 |
| Q1 2024 | May 14, 2024 | $858.3B | 20 |
| Q4 2023 | Feb 13, 2024 | $831.3B | 21 |
| Q3 2023 | Nov 13, 2023 | $688.2M | 21 |
| Q2 2023 | Aug 14, 2023 | $802.9M | 23 |
| Q1 2023 | May 12, 2023 | $655.1M | 23 |
| Q4 2022 | Feb 14, 2023 | $544.6M | 25 |
| Q3 2022 | Nov 14, 2022 | $377.5M | 23 |
| Q2 2022 | Aug 15, 2022 | $357.3M | 21 |
| Q1 2022 | May 13, 2022 | $461.0M | 24 |
| Q4 2021 | Feb 14, 2022 | $423.9M | 27 |
| Q3 2021 | Nov 12, 2021 | $341.6M | 26 |
| Q2 2021 | Jul 13, 2021 | $271.7M | 24 |
| Q1 2021 | May 14, 2021 | $251.4M | 23 |
| Q4 2020 | Feb 12, 2021 | $242.9M | 28 |
| Q3 2020 | Nov 13, 2020 | $194.6M | 19 |
| Q2 2020 | Aug 13, 2020 | $220.6M | 20 |
| Q1 2020 | May 14, 2020 | $200.2M | 20 |
| Q4 2019 | Feb 12, 2020 | $344.6M | 23 |
| Q3 2019 | Nov 13, 2019 | $503.0M | 374 |
| Q2 2019 | Aug 14, 2019 | $344.3M | 26 |
| Q1 2019 | May 13, 2019 | $361.7B | 30 |
| Q4 2018 | Feb 12, 2019 | $294.9B | 29 |
| Q3 2018 | Nov 9, 2018 | $364.0M | 26 |
| Q2 2018 | Aug 13, 2018 | $374.5M | 32 |
| Q1 2018 | May 14, 2018 | $397.6M | 29 |
| Q4 2017 | Feb 12, 2018 | $445.4M | 32 |
| Q3 2017 | Nov 13, 2017 | $362.2M | 30 |
| Q2 2017 | Aug 14, 2017 | $443.2M | 33 |
| Q1 2017 | May 12, 2017 | $337.4M | 27 |
| Q4 2016 | Feb 13, 2017 | $340.0M | 30 |
| Q3 2016 | Nov 10, 2016 | $329.9M | 31 |
| Q2 2016 | Aug 15, 2016 | $336.5M | 27 |
| Q1 2016 | May 16, 2016 | $254.1M | 26 |
Fund Information
ACK Asset Management LLC is an institutional investment manager that files 13F reports with the SEC. As of the Q4 2025 filing, the fund reported a portfolio valued at $796.8M across 23 holdings. The largest position is MTRN (MTRN), representing 7.4% of the portfolio. Compared to the previous quarter, the fund opened 6 new positions and closed 3 positions. 13F filings are required quarterly disclosures that provide transparency into the holdings of institutional investment managers with at least $100 million in qualifying assets.