Managers / Q4 2025 · view latest →
ACK Asset Management LLC
CIK 0001510940 · 777 WEST PUTNAM AVENUE, SUITE 300, GREENWICH, CT, 06830 · 914 220-8340
Reported Value
$797M
Q4 2025
Positions
23
Filings on Record
32
2019–present window
Filed
Feb 13, 2026
original filing
Summary
Ack Asset Management Llc reported $797M in U.S.-listed holdings across 23 positions for Q4 2025.
Its largest position, MTRN, represents 7.4% of the portfolio.
Compared with Q3 2025, the fund opened 6 new positions and exited 3.
Reported Value by Quarter
13F Reported Value
Portfolio Composition
By security type
- Common Stock · 93.8% · $748M
- Other · 6.2% · $49M
Quarter-over-Quarter Changes full breakdown →
Holdings — Q4 2025
Filing History
| Quarter | Reported Value | Positions | Filed | Type | Links |
|---|---|---|---|---|---|
| Q1 2026 | $801M | 20 | May 15, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q4 2025 | $797M | 23 | Feb 13, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q3 2025 | $799M | 20 | Nov 14, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q2 2025 | $761M | 21 | Aug 13, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q1 2025 | $609M | 20 | May 13, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q4 2024 | $746M | 22 | Feb 13, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q3 2024 | $809M | 18 | Nov 13, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q2 2024 | $810M | 19 | Aug 13, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q1 2024 | $858M | 20 | May 14, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q4 2023 | $831M | 21 | Feb 13, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q3 2023 | $688,243 | 21 | Nov 13, 2023 | 13F-HR | changes · EDGAR ↗ |
| Q2 2023 | $802,904 | 23 | Aug 15, 2023 | RESTATEMENT | changes · EDGAR ↗ |
| Q1 2023 | $655,113 | 23 | May 12, 2023 | 13F-HR | changes · EDGAR ↗ |
| Q4 2022 | $545M | 25 | Feb 14, 2023 | 13F-HR | changes · EDGAR ↗ |
| Q3 2022 | $378M | 23 | Nov 14, 2022 | 13F-HR | changes · EDGAR ↗ |
| Q2 2022 | $357M | 21 | Aug 15, 2022 | 13F-HR | changes · EDGAR ↗ |
| Q1 2022 | $461M | 24 | May 13, 2022 | 13F-HR | changes · EDGAR ↗ |
| Q4 2021 | $424M | 27 | Feb 14, 2022 | 13F-HR | changes · EDGAR ↗ |
| Q3 2021 | $342M | 26 | Nov 12, 2021 | 13F-HR | changes · EDGAR ↗ |
| Q2 2021 | $272M | 24 | Jul 13, 2021 | 13F-HR | changes · EDGAR ↗ |
| Q1 2021 | $251M | 23 | May 14, 2021 | 13F-HR | changes · EDGAR ↗ |
| Q4 2020 | $243M | 28 | Feb 12, 2021 | 13F-HR | changes · EDGAR ↗ |
| Q3 2020 | $195M | 19 | Nov 13, 2020 | 13F-HR | changes · EDGAR ↗ |
| Q2 2020 | $221M | 20 | Aug 13, 2020 | 13F-HR | changes · EDGAR ↗ |
| Q1 2020 | $200M | 20 | May 14, 2020 | 13F-HR | changes · EDGAR ↗ |
| Q4 2019 | $345M | 23 | Feb 12, 2020 | 13F-HR | changes · EDGAR ↗ |
| Q3 2019 | $356M | 25 | Nov 13, 2019 | RESTATEMENT | changes · EDGAR ↗ |
| Q2 2019 | $344M | 26 | Aug 14, 2019 | 13F-HR | changes · EDGAR ↗ |
| Q1 2019 | $361.7B | 30 | May 13, 2019 | 13F-HR | changes · EDGAR ↗ |
| Q4 2018 | $294.9B | 29 | Feb 12, 2019 | 13F-HR | changes · EDGAR ↗ |
13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.