Who owns Algoma Steel Group Inc.?
Institutional ownership of ASTL from SEC Form 13F filings across 66 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.
66
13F holders
$177.7M
value, 2026 filers
42.2%
of shares outstanding (44.5M sh)
8
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% | 16% | +5.8% |
| 2 | BlackRock, Inc. | 4.1M | $16.8M | 0.0% | 3.9% | +0.7% |
| 3 | Scheer, Rowlett & Associates Investment Management Ltd. | 3.8M | $15.7M | 1.1% | 3.6% | +19.9% |
| 4 | MORGAN STANLEY | 3.0M | $12.0M | 0.0% | 2.8% | +99.4% |
| 5 | LITTLEJOHN & CO LLC | 1.5M | $6.2M | 7.8% | 1.4% | -55.9% |
| 6 | Connor, Clark & Lunn Investment Management Ltd. | 1.4M | $5.6M | 0.0% | 1.3% | -19.6% |
| 7 | MACKENZIE FINANCIAL CORP | 1.3M | $5.0M | 0.0% | 1.3% | +1246.3% |
| 8 | TWO SIGMA INVESTMENTS, LP | 1.0M | $4.2M | 0.0% | 1% | +286.0% |
| 9 | Bracebridge Capital, LLC | 924,931 | $3.7M | 0.1% | 0.9% | 0.0% |
| 10 | CITADEL ADVISORS LLC | 845,935 | $3.4M | 0.0% | 0.8% | +216.0% |
| 11 | JPMORGAN CHASE & CO | 810,208 | $3.2M | 0.0% | 0.8% | +251.0% |
| 12 | D. E. Shaw & Co., Inc. | 670,373 | $2.7M | 0.0% | 0.6% | +147.8% |
| 13 | TCW GROUP INC | 607,478 | $2.5M | 0.0% | 0.6% | -20.9% |
| 14 | Point72 Asset Management, L.P. | 575,225 | $2.3M | 0.0% | 0.5% | +678.2% |
| 15 | MARSHALL WACE, LLPNEW | 499,494 | $2.0M | 0.0% | 0.5% | new |
| 16 | TD Asset Management Inc | 498,279 | $2.0M | 0.0% | 0.5% | -40.8% |
| 17 | ACADIAN ASSET MANAGEMENT LLC | 488,194 | $1,986 | 0.0% | 0.5% | +3198.6% |
| 18 | Russell Investments Group, Ltd. | 471,288 | $1.9M | 0.0% | 0.4% | -17.5% |
| 19 | READYSTATE ASSET MANAGEMENT LP | 463,228 | $1.9M | 0.1% | 0.4% | 0.0% |
| 20 | Sixth Street Partners Management Company, L.P.NEW | 438,431 | $1.8M | 0.3% | 0.4% | new |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 438,431 | $1.8M | 0.0% | 0.4% | -26.8% |
| 22 | BNP PARIBAS FINANCIAL MARKETS | 418,754 | $1.7M | 0.0% | 0.4% | +540.1% |
| 23 | MILLENNIUM MANAGEMENT LLC | 386,942 | $1.6M | 0.0% | 0.4% | -49.5% |
| 24 | BARCLAYS PLC | 308,972 | $1.3M | 0.0% | 0.3% | +80.1% |
| 25 | Voleon Capital Management LP | 307,297 | $1.2M | 0.0% | 0.3% | +134.7% |
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.