Who owns Algoma Steel Group Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ASTL from SEC Form 13F filings across 95 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 95 institutions disclosed 72.1M shares of Algoma Steel Group Inc. worth $291.8M — about 66% of shares outstanding; the largest disclosed holder is Maple Rock Capital Partners Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
95
13F holders
$291.8M
value, 2026 filers
66%
of shares outstanding (72.1M sh)
12
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ASTL's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Maple Rock Capital Partners Inc. | 16.9M | $68.3M | 1.3% | 15.4% | +5.8% |
| 2 | MMCAP International Inc. SPC | 11.0M | $44.4M | 3.8% | 10% | -14.7% |
| 3 | DONALD SMITH & CO., INC. | 5.3M | $21.4M | 0.4% | 4.8% | -12.5% |
| 4 | BlackRock, Inc. | 4.1M | $16.8M | 0.0% | 3.8% | +0.7% |
| 5 | Scheer, Rowlett & Associates Investment Management Ltd. | 3.8M | $15.7M | 1.1% | 3.5% | +19.9% |
| 6 | MORGAN STANLEY | 3.0M | $12.0M | 0.0% | 2.7% | +99.4% |
| 7 | AEGIS FINANCIAL CORP | 1.8M | $7.2M | 1.1% | 1.6% | 0.0% |
| 8 | CDC Financial, Inc. | 1.7M | $7.1M | 3.0% | 1.6% | +8.2% |
| 9 | BRIGHTLINE CAPITAL MANAGEMENT, LLCNEW | 1.7M | $6.7M | 1.5% | 1.5% | new |
| 10 | LITTLEJOHN & CO LLC | 1.5M | $6.2M | 7.8% | 1.4% | -55.9% |
| 11 | Connor, Clark & Lunn Investment Management Ltd. | 1.4M | $5.6M | 0.0% | 1.3% | -19.6% |
| 12 | MACKENZIE FINANCIAL CORP | 1.3M | $5.0M | 0.0% | 1.2% | +1246.3% |
| 13 | Sourcerock Group LLC | 1.2M | $5.1M | 0.3% | 1.1% | -4.5% |
| 14 | TWO SIGMA INVESTMENTS, LP | 1.0M | $4.2M | 0.0% | 1% | +286.0% |
| 15 | LM Asset Management Inc. | 1.0M | $4.1M | 2.6% | 0.9% | -42.4% |
| 16 | Bracebridge Capital, LLC | 924,931 | $3.7M | 0.1% | 0.8% | 0.0% |
| 17 | JB CAPITAL PARTNERS LP | 872,277 | $3.5M | 0.5% | 0.8% | 0.0% |
| 18 | CITADEL ADVISORS LLC | 845,935 | $3.4M | 0.0% | 0.8% | +216.0% |
| 19 | Bain Capital Credit, LP | 825,777 | $3.3M | 0.9% | 0.8% | 0.0% |
| 20 | JPMORGAN CHASE & CO | 810,208 | $3.2M | 0.0% | 0.7% | +251.0% |
| 21 | Ewing Morris & Co. Investment Partners Ltd. | 722,350 | $2.9M | 1.5% | 0.7% | +1.7% |
| 22 | Quadrature Capital Ltd | 682,493 | $2.8M | 0.0% | 0.6% | -22.3% |
| 23 | D. E. Shaw & Co., Inc. | 670,373 | $2.7M | 0.0% | 0.6% | +147.8% |
| 24 | TCW GROUP INC | 607,478 | $2.5M | 0.0% | 0.6% | -20.9% |
| 25 | Point72 Asset Management, L.P. | 575,225 | $2.3M | 0.0% | 0.5% | +678.2% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.