As of November 6, 2026, Algoma Steel Group Inc. is a publicly traded company (Nasdaq: ASTL); its largest reported holder is Maple Rock Capital Partners Inc., with 15.1% on Schedule 13G/A of May 15, 2026, then MMCAP International Inc. SPC (10.4%). No bankruptcy or receivership appears in its SEC Form 8-K filings (Schedule 13G/A, May 15, 2026).
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Is Algoma Steel Group Inc. a real, registered company?
- Algoma Steel Group Inc. files with the SEC under CIK 1860805 (its SEC filings).
- Its shares are listed under the ticker ASTL on Nasdaq (SEC company record).
- Incorporated in A1; business address in Sault Ste. Marie, A6, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Algoma Steel Group Inc. in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names MMCAP International Inc. SPC (filed 2026-08-14).
Who are Algoma Steel Group Inc.'s owners and officers?
Algoma Steel Group Inc.: business address in Sault Ste. Marie, A6; industry Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) (Schedule 13G/A, 2026-08-14).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Mmcap International Inc. Spc | 10.4% |
| Schedule 13G, 2026-08-11 | Donald Smith & Co., Inc. | 5% |
| Schedule 13G/A, 2026-05-15 | Maple Rock Capital Partners Inc. | 15.1% |
| Schedule 13G/A, 2026-05-15 | Mmcap International Inc. Spc | 12.2% |
| Schedule 13G, 2026-05-13 | Donald Smith & Co., Inc. | 5.8% |
| Schedule 13G/A, 2026-02-17 | Mmcap International Inc. Spc | 10.9% |
| Schedule 13G, 2026-02-12 | Donald Smith & Co., Inc. | 5.6% |
| Schedule 13G/A, 2025-11-20 | Mmcap International Inc. Spc | 10% |
| Schedule 13G/A, 2025-11-14 | Mmcap International Inc. Spc | 7.7% |
| Schedule 13G, 2025-11-12 | Donald Smith & Co., Inc. | 5.7% |
| Schedule 13G/A, 2025-11-07 | Maple Rock Capital Partners Inc. | 13.3% |
| Schedule 13D/A, 2025-09-23 | Zekelman Industries, Inc. | 3.08% |
Questions about who owns Algoma Steel Group Inc.
Who owns Algoma Steel Group Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Algoma Steel Group Inc.: Maple Rock Capital Partners Inc. (15.1%, Schedule 13G/A, filed 2026-05-15), Mmcap International Inc. Spc (10.4%, Schedule 13G/A, filed 2026-08-14) and Donald Smith & Co., Inc. (5%, Schedule 13G, filed 2026-08-11).
Who are the largest shareholders of Algoma Steel Group Inc.?
By the share each holder's latest filing reports, the largest holders of Algoma Steel Group Inc. on this page are Maple Rock Capital Partners Inc. (15.1%), Mmcap International Inc. Spc (10.4%) and Donald Smith & Co., Inc. (5%).
When did Maple Rock Capital Partners Inc. buy into Algoma Steel Group Inc.?
The filings give report dates, not purchase dates. The earliest filing from Maple Rock Capital Partners Inc. on this page is the Schedule 13G/A, filed 2025-11-07, reporting 13.3%; its latest, Schedule 13G/A filed 2026-05-15, reports 15.1%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Algoma Steel Group Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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How much has Algoma Steel Group Inc. raised?
No fundraising or offering filing from Algoma Steel Group Inc. is on file with us.
Keep reading
More on Algoma Steel Group Inc. and the records around it.
Algoma Steel Group Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
Companies that share a holder
- Stoney Lonesome HF LP also filed stake reports on 4 other companies: Health Catalyst, Inc. (Aug 2026), Advanced Flower Capital Inc. (Jul 2026), Amplify Energy Corp. (Mar 2026)
- DONALD SMITH & CO., INC. also filed stake reports on 23 other companies: Allegiant Travel CO (Aug 2026), BEAZER HOMES USA INC (Aug 2026), Chatham Lodging Trust (Aug 2026)
- MMCAP International Inc. SPC also filed stake reports on 52 other companies: BHAV Acquisition Corp II (Nov 2026), Haymaker Acquisition Corp V (Sep 2026), Thunder Bridge Capital Partners V, Ltd. (Aug 2026)
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