ACK Asset Management LLC: MTRN (MTRN): Quarterly 13F Position History
As of Q1 2026, ACK Asset Management LLC reported 474,800 shares of MTRN (MTRN), worth $68.7M and representing 8.6% of its 13F equity book. The position first appeared in Q3 2017 and has been disclosed across 35 13F-HR filings in Pactolio's tracked window.
- 474,800Shares Held (Latest Filing)
- $68.7MReported Market Value (Latest Filing)
- 8.6%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- +$9.7MQuarter-over-Quarter Value Change
- 2,000,000Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 35 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 474,800 | 0 | — | $68.7M | 8.6% | $144.7 |
| Q4 2025 | 474,800 | 50,000 | -9.5% | $59.0M | 7.4% | $124.3 |
| Q3 2025 | 524,800 | 0 | — | $63.4M | 7.9% | $120.8 |
| Q2 2025 | 524,800 | +65,600 | +14.3% | $41.7M | 5.5% | $79.4 |
| Q1 2025 | 459,200 | 35,600 | -7.2% | $37.5M | 6.2% | $81.6 |
| Q4 2024 | 494,800 | 10,700 | -2.1% | $48.9M | 6.6% | $98.9 |
| Q3 2024 | 505,500 | 0 | — | $56.5M | 7.0% | $111.9 |
| Q2 2024 | 505,500 | +25,000 | +5.2% | $54.7M | 6.7% | $108.1 |
| Q1 2024 | 480,500 | 0 | — | $63.3M | 7.4% | $131.8 |
| Q4 2023 | 480,500 | 0 | — | $62.5M | 7.5% | $130.1 |
| Q3 2023 | 480,500 | 1,519,500 | -76.0% | $49.0M | 7.1% | $101.9 |
| Q2 2023 | 2,000,000 | +1,519,500 | +316.2% | $43.5M | 5.4% | $21.8 |
| Q1 2023 | 480,500 | 35,000 | -6.8% | $55.7M | 8.5% | $116.0 |
| Q4 2022 | 515,500 | +95,800 | +22.8% | $45.1M | 8.3% | $87.5 |
| Q3 2022 | 419,700 | 0 | — | $33.6M | 8.9% | $80.0 |
| Q2 2022 | 419,700 | 0 | — | $30.9M | 8.7% | $73.7 |
| Q1 2022 | 419,700 | +4,700 | +1.1% | $36.0M | 7.8% | $85.7 |
| Q4 2021 | 415,000 | +70,700 | +20.5% | $26.4M | 6.2% | $63.6 |
| Q3 2021 | 344,300 | +34,300 | +11.1% | $20.4M | 6.0% | $59.2 |
| Q2 2021 | 310,000 | +40,000 | +14.8% | $16.7M | 6.2% | $53.9 |
| Q1 2021 | 270,000 | +98,650 | +57.6% | $14.0M | 5.6% | $51.9 |
| Q4 2020 | 171,350 | 10,800 | -5.9% | $7.4M | 3.0% | $43.1 |
| Q3 2020 | 182,150 | 16,650 | -8.4% | $7.9M | 4.1% | $43.4 |
| Q2 2020 | 198,800 | +163,800 | +468.0% | $8.8M | 4.0% | $44.1 |
| Q1 2020 | 35,000 | +35,000 | — | $1.2M | 0.6% | $35.2 |
| Q4 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2018 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2018 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2018 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2018 | 0 | 310,000 | -100.0% | $0 | 0.0% | — |
| Q4 2017 | 310,000 | +182,183 | +142.5% | $15.1M | 3.4% | $48.6 |
| Q3 2017 | 127,817 | — | — | $5.5M | 1.5% | $43.1 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did ACK Asset Management LLC first disclose a MTRN position in 13F-HR filings?
ACK Asset Management LLC first reported MTRN (MTRN) on its 13F-HR filing for the period ending 2017-09-30 (Q3 2017). The position has appeared on 35 reported quarters within Pactolio's tracked window.
What was ACK Asset Management LLC's most recent quarter-over-quarter share-count change in MTRN?
ACK Asset Management LLC held the same 474,800 shares of MTRN between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent ACK Asset Management LLC's cost basis in MTRN?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.