ALGOMA STEEL GROUP INC (ASTL) Institutional Shareholders
ALGOMA STEEL GROUP INC (ASTL) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $289.34M in ASTL holdings during the latest filing period.
Maple Rock Capital Partners Inc. is currently the largest disclosed institutional shareholder of ASTL tracked by InsiderSet, reporting ownership valued at approximately $68.29M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $71.66M, representing an estimated gain of +4.94% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 71% of the total disclosed ASTL value among the investors covered in this analysis. Major shareholders include Maple Rock Capital Partners Inc., Mmcap International Inc. Spc, Donald Smith & Co., and several other long-term asset managers with concentrated positions in ALGOMA STEEL GROUP INC (ASTL).
This page ranks the largest institutional ASTL shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
94
Total Reported Value
$289.34M
Largest Holder
Maple Rock Capital Partners Inc.
Largest Position
$68.29M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
135
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Maple Rock Capital Partners Inc. | 1.34% | 16,861,818 | $68,290,363 | $71,662,727 | +$3,372,364 | +4.94% | |
| Mmcap International Inc. Spc | 3.76% | 10,954,738 | $44,366,689 | $46,557,637 | +$2,190,948 | +4.94% | |
| Donald Smith & Co. | Donald G. Smith | 0.38% | 5,277,631 | $21,374,406 | $22,429,932 | +$1,055,526 | +4.94% |
| Blackrock, Inc. | 0.00% | 4,143,265 | $16,780,223 | $17,608,876 | +$828,653 | +4.94% | |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.13% | 3,846,390 | $15,660,050 | $16,347,158 | +$687,108 | +4.39% | |
| Morgan Stanley | 0.00% | 2,958,350 | $11,981,317 | $12,572,988 | +$591,671 | +4.94% | |
| Aegis Financial Corp | 1.14% | 1,786,122 | $7,233,794 | $7,591,019 | +$357,225 | +4.94% | |
| Cdc Financial, Inc. | 5.43% | 1,745,647 | $7,069,870 | $7,419,000 | +$349,130 | +4.94% | |
| Brightline Capital Management, Llc | 1.46% | 1,660,000 | $6,723,000 | $7,055,000 | +$332,000 | +4.94% | |
| Littlejohn & Co Llc | 7.83% | 1,518,714 | $6,150,792 | $6,454,535 | +$303,743 | +4.94% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 1,387,320 | $5,648,283 | $5,896,110 | +$247,827 | +4.39% | |
| Sourcerock Group Llc | 0.26% | 1,247,507 | $5,052,403 | $5,301,905 | +$249,502 | +4.94% | |
| Mackenzie Financial Corp | 0.00% | 1,329,806 | $4,955,215 | $5,651,676 | +$696,461 | +14.06% | |
| Two Sigma Investments, Lp | 0.00% | 1,041,811 | $4,219,335 | $4,427,697 | +$208,362 | +4.94% | |
| Lm Asset Management Inc. | 2.85% | 1,016,000 | $4,114,800 | $4,318,000 | +$203,200 | +4.94% | |
| Bracebridge Capital, Llc | 0.81% | 924,931 | $3,745,971 | $3,930,957 | +$184,986 | +4.94% | |
| Jb Capital Partners Lp | 0.55% | 872,277 | $3,532,722 | $3,707,177 | +$174,455 | +4.94% | |
| Citadel Advisors Llc | 0.00% | 845,935 | $3,426,037 | $3,595,224 | +$169,187 | +4.94% | |
| Bain Capital Credit, Lp | 0.91% | 825,777 | $3,344,397 | $3,509,552 | +$165,155 | +4.94% | |
| Jpmorgan Chase & Co | 0.00% | 810,208 | $3,248,934 | $3,443,384 | +$194,450 | +5.99% | |
| Ewing Morris & Co. Investment Partners Ltd. | 1.54% | 722,350 | $2,942,860 | $3,069,988 | +$127,128 | +4.32% | |
| Quadrature Capital Ltd | 0.02% | 682,493 | $2,779,950 | $2,900,595 | +$120,645 | +4.34% | |
| D. E. Shaw & Co., Inc. | 0.00% | 670,373 | $2,721,987 | $2,849,085 | +$127,098 | +4.67% | |
| Point72 Asset Management, L.P. | 0.00% | 575,225 | $2,328,720 | $2,444,706 | +$115,986 | +4.98% | |
| Td Asset Management Inc | 0.00% | 498,279 | $2,029,993 | $2,117,686 | +$87,693 | +4.32% | |
| Marshall Wace, Llp | 0.00% | 499,494 | $2,022,951 | $2,122,850 | +$99,899 | +4.94% | |
| Acadian Asset Management Llc | 0.00% | 488,194 | $1,986,000 | $2,074,825 | +$88,825 | +4.47% | |
| Russell Investments Group, Ltd. | 0.00% | 471,288 | $1,908,713 | $2,002,974 | +$94,261 | +4.94% | |
| Readystate Asset Management Lp | 0.08% | 463,228 | $1,876,073 | $1,968,719 | +$92,646 | +4.94% | |
| Charles Schwab Investment Management Inc | 0.00% | 438,431 | $1,786,172 | $1,863,332 | +$77,160 | +4.32% | |
| Bnp Paribas Financial Markets | 0.00% | 418,754 | $1,695,954 | $1,779,705 | +$83,751 | +4.94% | |
| Millennium Management Llc | 0.00% | 386,942 | $1,570,380 | $1,644,504 | +$74,124 | +4.72% | |
| Dimensional Fund Advisors Lp | 0.00% | 356,116 | $1,442,024 | $1,513,493 | +$71,469 | +4.96% | |
| Barclays Plc | 0.00% | 308,972 | $1,251,337 | $1,313,131 | +$61,794 | +4.94% | |
| Voleon Capital Management Lp | 0.02% | 307,297 | $1,244,553 | $1,306,012 | +$61,459 | +4.94% | |
| Bank Of Montreal | 0.00% | 288,488 | $1,174,539 | $1,226,074 | +$51,535 | +4.39% | |
| Jump Financial, Llc | 0.01% | 289,675 | $1,173,184 | $1,231,119 | +$57,935 | +4.94% | |
| Goldman Sachs Group Inc | 0.00% | 264,994 | $1,073,226 | $1,126,225 | +$52,999 | +4.94% | |
| Royal Bank Of Canada | 0.00% | 149,303 | $604,000 | $634,538 | +$30,538 | +5.06% | |
| Quinn Opportunity Partners Llc | 0.03% | 142,336 | $576,461 | $604,928 | +$28,467 | +4.94% | |
| Simplex Trading, Llc | 0.01% | 125,725 | $509,186 | $534,331 | +$25,145 | +4.94% | |
| Xtx Topco Ltd | 0.01% | 122,662 | $496,781 | $521,314 | +$24,533 | +4.94% | |
| Bank Of America Corp | 0.00% | 116,242 | $470,780 | $494,029 | +$23,249 | +4.94% | |
| Summit Financial, Llc | 0.00% | 110,333 | $446,849 | $468,915 | +$22,066 | +4.94% | |
| Quantbot Technologies Lp | 0.02% | 109,199 | $442,256 | $464,096 | +$21,840 | +4.94% | |
| Exoduspoint Capital Management, Lp | 0.00% | 101,746 | $412,071 | $432,421 | +$20,350 | +4.94% | |
| Sig North Trading, Ulc | 0.07% | 96,117 | $389,274 | $408,497 | +$19,223 | +4.94% | |
| Boston Partners | 0.00% | 88,825 | $359,740 | $377,506 | +$17,766 | +4.94% | |
| Pdt Partners, Llc | 0.02% | 73,079 | $295,970 | $310,586 | +$14,616 | +4.94% | |
| Boothbay Fund Management, Llc | 0.01% | 71,194 | $288,336 | $302,575 | +$14,239 | +4.94% |
Frequently asked questions about ASTL
Who owns the most ASTL stock?
The largest holders of ASTL are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ALGOMA STEEL GROUP INC (ASTL).
Is ASTL widely held by superinvestors?
Many widely followed stocks like ASTL appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ASTL is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.