ASTL Algoma Steel Group Inc
Algoma Steel Group Inc (ASTL) Institutional Ownership
What the institutions did with ASTL last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| Maple Rock Capital Partners Inc. | 16.9M | 20.4% |
| MMCAP International Inc. SPC | 11.0M | 13.2% |
| CDC Financial, Inc. | 5.9M | 7.1% |
| DONALD SMITH & CO., INC. | 5.3M | 6.4% |
| BlackRock, Inc. | 4.1M | 5.0% |
| Scheer, Rowlett & Associates Investment Management Ltd. | 3.8M | 4.6% |
| MORGAN STANLEY | 3.0M | 3.6% |
| LMR Partners LLP | 2.8M | 3.4% |
| AEGIS FINANCIAL CORP | 1.8M | 2.2% |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC | 1.7M | 2.0% |
| LITTLEJOHN & CO LLC | 1.5M | 1.8% |
| Connor, Clark & Lunn Investment Management Ltd. | 1.4M | 1.7% |
| MACKENZIE FINANCIAL CORP | 1.3M | 1.6% |
| Sourcerock Group LLC | 1.2M | 1.5% |
| D. E. Shaw & Co., Inc. | 1.2M | 1.5% |
| TWO SIGMA INVESTMENTS, LP | 1.0M | 1.3% |
| LM Asset Management Inc. | 1.0M | 1.2% |
| Bracebridge Capital, LLC | 924.9K | 1.1% |
| JB CAPITAL PARTNERS LP | 872.3K | 1.1% |
| CITADEL ADVISORS LLC | 845.9K | 1.0% |
| Bain Capital Credit, LP | 825.8K | 1.0% |
| ARISTEIA CAPITAL, L.L.C. | 810.4K | 1.0% |
| JPMORGAN CHASE & CO | 810.2K | 1.0% |
| Ewing Morris & Co. Investment Partners Ltd. | 722.4K | 0.9% |
| K2 PRINCIPAL FUND, L.P. | 690.9K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| CDC Financial, Inc. | Increased | 1.6M | 5.9M | +4.3M |
| LMR Partners LLP | New | 0 | 2.8M | +2.8M |
| LITTLEJOHN & CO LLC | Reduced | 3.4M | 1.5M | -1.9M |
| MMCAP International Inc. SPC | Reduced | 12.8M | 11.0M | -1.9M |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC | New | 0 | 1.7M | +1.7M |
| MORGAN STANLEY | Increased | 1.5M | 3.0M | +1.5M |
| MACKENZIE FINANCIAL CORP | Increased | 98.8K | 1.3M | +1.2M |
| Solas Capital Management, LLC | Sold Out | 1.0M | 0 | -1.0M |
| D. E. Shaw & Co., Inc. | Increased | 270.5K | 1.2M | +957.6K |
| Maple Rock Capital Partners Inc. | Increased | 15.9M | 16.9M | +931.0K |
| TWO SIGMA INVESTMENTS, LP | Increased | 269.9K | 1.0M | +771.9K |
| DONALD SMITH & CO., INC. | Reduced | 6.0M | 5.3M | -751.3K |
| LM Asset Management Inc. | Reduced | 1.8M | 1.0M | -749.0K |
| JANE STREET GROUP, LLC | Reduced | 895.6K | 153.5K | -742.1K |
| ARISTEIA CAPITAL, L.L.C. | Increased | 91.4K | 810.4K | +719.0K |
| K2 PRINCIPAL FUND, L.P. | New | 0 | 690.9K | +690.9K |
| Scheer, Rowlett & Associates Investment Management Ltd. | Increased | 3.2M | 3.8M | +638.9K |
| JPMORGAN CHASE & CO | Increased | 230.8K | 810.2K | +579.4K |
| CITADEL ADVISORS LLC | Increased | 267.7K | 845.9K | +578.2K |
| Point72 Asset Management, L.P. | Increased | 73.9K | 575.2K | +501.3K |
| MARSHALL WACE, LLP | New | 0 | 499.5K | +499.5K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 14.8K | 488.2K | +473.4K |
| HRT FINANCIAL LP | Sold Out | 467.2K | 0 | -467.2K |
| Aequim Alternative Investments LP | New | 0 | 414.2K | +414.2K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 766.4K | 386.9K | -379.5K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 65.4K | 418.8K | +353.3K |
| TD Asset Management Inc | Reduced | 841.9K | 498.3K | -343.6K |
| Connor, Clark & Lunn Investment Management Ltd. | Reduced | 1.7M | 1.4M | -338.4K |
| UBS Group AG | Reduced | 307.0K | 12.3K | -294.6K |
| Jump Financial, LLC | New | 0 | 289.7K | +289.7K |
| CenterBook Partners LP | Sold Out | 233.5K | 0 | -233.5K |
| WOLVERINE ASSET MANAGEMENT LLC | New | 0 | 229.9K | +229.9K |
| BOOTHBAY FUND MANAGEMENT, LLC | Increased | 45.1K | 256.2K | +211.1K |
| StoneX Group Inc. | New | 0 | 207.9K | +207.9K |
| Quadrature Capital Ltd | Reduced | 878.5K | 682.5K | -196.0K |
| Voleon Capital Management LP | Increased | 130.9K | 307.3K | +176.4K |
| Virtu Financial LLC | New | 0 | 164.9K | +164.9K |
| TCW GROUP INC | Reduced | 768.2K | 607.5K | -160.7K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 598.9K | 438.4K | -160.5K |
| BARCLAYS PLC | Increased | 171.6K | 309.0K | +137.4K |
| ExodusPoint Capital Management, LP | Reduced | 229.6K | 101.7K | -127.8K |
| RENAISSANCE TECHNOLOGIES LLC | Sold Out | 117.3K | 0 | -117.3K |
| TORONTO DOMINION BANK | Increased | 26.2K | 129.6K | +103.4K |
| Claret Asset Management Corp | Increased | 30.4K | 132.4K | +102.0K |
| Russell Investments Group, Ltd. | Reduced | 571.6K | 471.3K | -100.3K |
| Assenagon Asset Management S.A. | Sold Out | 99.1K | 0 | -99.1K |
| AYAL Capital Advisors Ltd | Sold Out | 95.0K | 0 | -95.0K |
| SIG North Trading, ULC | Reduced | 171.8K | 96.1K | -75.7K |
| FNY Investment Advisers, LLC | Reduced | 65.3K | 830 | -64.5K |
| XTX Topco Ltd | Reduced | 182.3K | 122.7K | -59.7K |
| Sourcerock Group LLC | Reduced | 1.3M | 1.2M | -58.9K |
| BANK OF AMERICA CORP /DE/ | Increased | 62.4K | 116.2K | +53.8K |
| GROUP ONE TRADING LLC | Reduced | 85.7K | 34.9K | -50.8K |
| Quantbot Technologies LP | Reduced | 157.9K | 109.2K | -48.7K |
| Campbell & CO Investment Adviser LLC | New | 0 | 41.0K | +41.0K |
| NATIONAL BANK OF CANADA /FI/ | New | 0 | 41.0K | +41.0K |
| Aquatic Capital Management LLC | Reduced | 47.3K | 11.2K | -36.1K |
| Lavaca Capital LLC | New | 0 | 35.6K | +35.6K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 35.5K | +35.5K |
| TWO SIGMA SECURITIES, LLC | Sold Out | 35.4K | 0 | -35.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.