Feeds › Ownership stakes (13D / 13G)
Ownership stakes (13D / 13G)
Investors who own more than 5% of a company, from activists (13D) to passive holders (13G).
About this data
- What it is
- An investor who owns more than 5% of a public company must say so. Investors who may try to influence the company, such as activists, file the longer Schedule 13D; passive holders file the shorter Schedule 13G.
- Who files it
- The investor, within days of crossing 5%, and again whenever the stake changes materially.
- How current
- We collect new filings throughout the day on SEC business days.
- Worth knowing
- 13G filings are far more common than 13D. A 13D usually means the investor intends to push for changes, so it tends to get more attention.
All of this comes from public filings.
Source and freshness · Information, not investment advice (disclaimer).
Filings per day, last 30 days
13D (activist) 13G (passive)
Latest ownership filings
Showing: ticker ASTL
| Filed | ScheduleBoth report a stake of more than 5%. A 13D is filed by investors who may try to influence the company, such as activists; a 13G by passive holders. | Company | Investor | Shares | % of shares | Filing |
|---|---|---|---|---|---|---|
| Nov 13, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 5.25M | 5.0% | SCHEDULE 13G ↗ |
| Nov 13, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 5.25M | 5.0% | SCHEDULE 13G ↗ |
| Aug 14, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 10.95M | 10.4% | SCHEDULE 13G/A ↗ |
| Aug 14, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 10.95M | 10.4% | SCHEDULE 13G/A ↗ |
| Aug 11, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 5.28M | 5.0% | SCHEDULE 13G ↗ |
| Aug 11, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 5.28M | 5.0% | SCHEDULE 13G ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 12.85M | 12.2% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 12.85M | 12.2% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Xavier Majic | 15.93M | 15.1% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Maple Rock Capital Partners Inc. | 15.93M | 15.1% | SCHEDULE 13G/A ↗ |
| May 13, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 6.03M | 5.8% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 6.03M | 5.8% | SCHEDULE 13G ↗ |
| Feb 17, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 11.49M | 10.9% | SCHEDULE 13G/A ↗ |
| Feb 17, 2026 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 11.49M | 10.9% | SCHEDULE 13G/A ↗ |
| Feb 12, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 5.86M | 5.6% | SCHEDULE 13G ↗ |
| Feb 12, 2026 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 5.86M | 5.6% | SCHEDULE 13G ↗ |
| Nov 20, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 10.53M | 10.0% | SCHEDULE 13G/A ↗ |
| Nov 20, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 10.53M | 10.0% | SCHEDULE 13G/A ↗ |
| Nov 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 8.08M | 7.7% | SCHEDULE 13G/A ↗ |
| Nov 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 8.08M | 7.7% | SCHEDULE 13G/A ↗ |
| Nov 12, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 5.40M | 5.7% | SCHEDULE 13G ↗ |
| Nov 12, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 5.94M | 5.7% | SCHEDULE 13G ↗ |
| Nov 7, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Xavier Majic | 13.99M | 13.3% | SCHEDULE 13G/A ↗ |
| Nov 7, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Maple Rock Capital Partners Inc. | 13.99M | 13.3% | SCHEDULE 13G/A ↗ |
| Sep 23, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Atlas Tube Canada ULC | 3.23M | 3.1% | SCHEDULE 13D/A ↗ |
| Sep 23, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Zekelman Industries, Inc. | 3.23M | 3.1% | SCHEDULE 13D/A ↗ |
| Aug 28, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Xavier Majic | 10.43M | 9.9% | SCHEDULE 13G ↗ |
| Aug 28, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Maple Rock Capital Partners Inc. | 10.43M | 9.9% | SCHEDULE 13G ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 7.22M | 6.9% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 7.22M | 6.9% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Clint D. Coghill | 5.86M | 5.4% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | CDC Financial, Inc. | 5.85M | 5.4% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Drake Helix Holdings, LLC | 381,522 | 0.4% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Coghill Capital Management LLC | 5.47M | 5.1% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | Stoney Lonesome HF LP | 5.47M | 5.1% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Xavier Majic | 10.43M | 9.9% | SCHEDULE 13D/A ↗ |
| Aug 14, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Maple Rock Capital Partners Inc. | 10.43M | 9.9% | SCHEDULE 13D/A ↗ |
| Aug 13, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 6.04M | 0.0% | SCHEDULE 13G ↗ |
| Aug 13, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 6.04M | 5.8% | SCHEDULE 13G ↗ |
| May 15, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MM Asset Management Inc. | 6.64M | 6.3% | SCHEDULE 13G/A ↗ |
| May 15, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | MMCAP International Inc. SPC | 6.64M | 6.3% | SCHEDULE 13G/A ↗ |
| May 13, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 8.09M | 7.7% | SCHEDULE 13G ↗ |
| May 13, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Donald Smith & Co., Inc. | 8.09M | 7.7% | SCHEDULE 13G ↗ |
| May 5, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Xavier Majic | 7.55M | 7.2% | SCHEDULE 13D/A ↗ |
| May 5, 2025 | SCHEDULE 13D/A (amended) | ASTL Algoma Steel Group Inc. | Maple Rock Capital Partners Inc. | 7.55M | 7.2% | SCHEDULE 13D/A ↗ |
| Apr 29, 2025 | SCHEDULE 13G/A (amended) | ASTL Algoma Steel Group Inc. | BlackRock, Inc. | 3.84M | 3.7% | SCHEDULE 13G/A ↗ |
| Apr 10, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Clint Coghill | 15,270 | 0.0% | SCHEDULE 13G ↗ |
| Apr 10, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | The Drake Helix Holdings, LLC | 366,522 | 0.3% | SCHEDULE 13G ↗ |
| Apr 10, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | Stoney Lonesome HF LP | 5.46M | 5.2% | SCHEDULE 13G ↗ |
| Feb 13, 2025 | SCHEDULE 13G | ASTL Algoma Steel Group Inc. | DSCO Value Fund, L.P. | 8.07M | 7.7% | SCHEDULE 13G ↗ |
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