Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Algoma Steel Group Inc.

CIK 0001860805ASTLASTLW· quarter ending 2026-06-30

Shares outstanding

104,933,802

as of 2025-12-31 · 40-F cover page, filed 2026-03-12

Held by 13F filers

72,117,887

68.7% of shares outstanding

Holders

-3 vs 2026-03-31 · 12 new, 15 exited

Value

$291.8M

shares +0.2% vs prior quarter

Share classes (cover page of the 40-F filed 2026-03-12, as of 2025-12-31)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	ASTL · NASDAQ	104,933,802	72,117,887	68.7%	95	015658107

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	015658107	COM	95	72,117,887	104,933,802	68.7%	$291.8M	5 call / 2 put	13DG	holders →
	015658115	*W EXP 10/19/202not common	20	10,695,515	—	—	$1.3M	1 call / 0 put	prefix	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (95 of 95 · 015658107)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Maple Rock Capital Partners Inc.	16,861,818	16.07%	$68.3M	+931,000 (+5.8%)
2	MMCAP International Inc. SPC	10,954,738	10.44%	$44.4M	-1,890,884 (-14.7%)
3	DONALD SMITH & CO., INC.	5,277,631	5.03%	$21.4M	-751,298 (-12.5%)
4	BlackRock, Inc.	4,143,265	3.95%	$16.8M	+27,812 (+0.7%)
5	Scheer, Rowlett & Associates Investment Management Ltd.	3,846,390	3.67%	$15.7M	+638,910 (+19.9%)
6	MORGAN STANLEY	2,958,350	2.82%	$12.0M	+1,474,639 (+99.4%)
7	AEGIS FINANCIAL CORP	1,786,122	1.70%	$7.2M	—
8	CDC Financial, Inc.	1,745,647	1.66%	$7.1M	+131,898 (+8.2%)
9	BRIGHTLINE CAPITAL MANAGEMENT, LLC	1,660,000	1.58%	$6.7M	NEW
10	LITTLEJOHN & CO LLC	1,518,714	1.45%	$6.2M	-1,927,789 (-55.9%)
11	Connor, Clark & Lunn Investment Management Ltd.	1,387,320	1.32%	$5.6M	-338,438 (-19.6%)
12	MACKENZIE FINANCIAL CORP	1,329,806	1.27%	$5.0M	+1,231,033 (+1246.3%)
13	Sourcerock Group LLC	1,247,507	1.19%	$5.1M	-58,896 (-4.5%)
14	TWO SIGMA INVESTMENTS, LP	1,041,811	0.99%	$4.2M	+771,911 (+286.0%)
15	LM Asset Management Inc.	1,016,000	0.97%	$4.1M	-749,000 (-42.4%)
16	Bracebridge Capital, LLC	924,931	0.88%	$3.7M	—
17	JB CAPITAL PARTNERS LP	872,277	0.83%	$3.5M	—
18	CITADEL ADVISORS LLC	845,935	0.81%	$3.4M	+578,192 (+216.0%)
19	Bain Capital Credit, LP	825,777	0.79%	$3.3M	—
20	JPMORGAN CHASE & CO	810,208	0.77%	$3.2M	+579,391 (+251.0%)
21	Ewing Morris & Co. Investment Partners Ltd.	722,350	0.69%	$2.9M	+12,350 (+1.7%)
22	Quadrature Capital Ltd	682,493	0.65%	$2.8M	-196,047 (-22.3%)
23	D. E. Shaw & Co., Inc.	670,373	0.64%	$2.7M	+399,829 (+147.8%)
24	TCW GROUP INC	607,478	0.58%	$2.5M	-160,700 (-20.9%)
25	Point72 Asset Management, L.P.	575,225	0.55%	$2.3M	+501,309 (+678.2%)
26	MARSHALL WACE, LLP	499,494	0.48%	$2.0M	NEW
27	TD Asset Management Inc	498,279	0.47%	$2.0M	-343,625 (-40.8%)
28	ACADIAN ASSET MANAGEMENT LLC	488,194	0.47%	$2.0M	+473,394 (+3198.6%)
29	Russell Investments Group, Ltd.	471,288	0.45%	$1.9M	-100,278 (-17.5%)
30	READYSTATE ASSET MANAGEMENT LP	463,228	0.44%	$1.9M	—
31	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	438,431	0.42%	$1.8M	-160,488 (-26.8%)
32	BNP PARIBAS FINANCIAL MARKETS	418,754	0.40%	$1.7M	+353,337 (+540.1%)
33	MILLENNIUM MANAGEMENT LLC	386,942	0.37%	$1.6M	-379,469 (-49.5%)
34	DIMENSIONAL FUND ADVISORS LP	356,116	0.34%	$1.4M	-5,880 (-1.6%)
35	BARCLAYS PLC	308,972	0.29%	$1.3M	+137,416 (+80.1%)
36	Voleon Capital Management LP	307,297	0.29%	$1.2M	+176,378 (+134.7%)
37	Jump Financial, LLC	289,675	0.28%	$1.2M	NEW
38	BANK OF MONTREAL /CAN/	288,488	0.27%	$1.2M	+15,875 (+5.8%)
39	GOLDMAN SACHS GROUP INC	264,994	0.25%	$1.1M	+12,537 (+5.0%)
40	ROYAL BANK OF CANADA	149,303	0.14%	$604K	+2,482 (+1.7%)
41	Quinn Opportunity Partners LLC	142,336	0.14%	$576K	—
42	SIMPLEX TRADING, LLC	125,725	0.12%	$509K	-29,180 (-18.8%)
43	XTX Topco Ltd	122,662	0.12%	$497K	-59,685 (-32.7%)
44	BANK OF AMERICA CORP /DE/	116,242	0.11%	$471K	+53,849 (+86.3%)
45	Summit Financial, LLC	110,333	0.11%	$447K	—
46	Quantbot Technologies LP	109,199	0.10%	$442K	-48,729 (-30.9%)
47	ExodusPoint Capital Management, LP	101,746	0.10%	$412K	-127,817 (-55.7%)
48	SIG North Trading, ULC	96,117	0.09%	$389K	-75,700 (-44.1%)
49	Boston Partners	88,825	0.08%	$360K	+1,758 (+2.0%)
50	PDT Partners, LLC	73,079	0.07%	$296K	+2,775 (+3.9%)
51	BOOTHBAY FUND MANAGEMENT, LLC	71,194	0.07%	$288K	+26,124 (+58.0%)
52	GEODE CAPITAL MANAGEMENT, LLC	67,859	0.06%	$275K	+4,046 (+6.3%)
53	GSA CAPITAL PARTNERS LLP	66,463	0.06%	$269K	+11,480 (+20.9%)
54	LPL Financial LLC	56,526	0.05%	$229K	-3,268 (-5.5%)
55	Terril Brothers, Inc.	54,000	0.05%	$219K	-4,000 (-6.9%)
56	HSBC HOLDINGS PLC	53,267	0.05%	$214K	-1,112 (-2.0%)
57	JANE STREET GROUP, LLC	52,687	0.05%	$213K	-842,879 (-94.1%)
58	AMERICAN CENTURY COMPANIES INC	50,800	0.05%	$207K	+9,724 (+23.7%)
59	Invesco Ltd.	42,054	0.04%	$170K	-17,096 (-28.9%)
60	Squarepoint Ops LLC	41,806	0.04%	$169K	-22,368 (-34.9%)
61	Campbell & CO Investment Adviser LLC	41,049	0.04%	$166K	NEW
62	Phoenix Financial Ltd.	35,714	0.03%	$145K	—
63	Lavaca Capital LLC	35,573	0.03%	$144K	NEW
64	Y-Intercept (Hong Kong) Ltd	35,549	0.03%	$144K	NEW
65	GROUP ONE TRADING LLC	34,896	0.03%	$141K	-50,760 (-59.3%)
66	PRELUDE CAPITAL MANAGEMENT, LLC	31,881	0.03%	$129K	NEW
67	Claret Asset Management Corp	30,375	0.03%	$123K	—
68	NewEdge Advisors, LLC	27,899	0.03%	$113K	-400 (-1.4%)
69	Verition Fund Management LLC	26,803	0.03%	$109K	—
70	Olympiad Research LP	25,736	0.02%	$104K	NEW
71	CIBC WORLD MARKET INC.	25,300	0.02%	$102K	-251 (-1.0%)
72	FIL Ltd	22,908	0.02%	$93K	-8,053 (-26.0%)
73	Empirical Financial Services, LLC d.b.a. Empirical Wealth Management	21,773	0.02%	$88K	—
74	Net Worth Advisory Group	20,833	0.02%	$84K	-1,555 (-6.9%)
75	Federation des caisses Desjardins du Quebec	18,360	0.02%	$74K	—
76	VICTORY CAPITAL MANAGEMENT INC	11,223	0.01%	$45K	+416 (+3.8%)
77	Aquatic Capital Management LLC	11,173	0.01%	$45K	-36,084 (-76.4%)
78	EJF Capital LP	11,000	0.01%	$45K	—
79	SG Americas Securities, LLC	10,886	0.01%	$44K	NEW
80	ELEMENT POINTE ADVISORS, LLC	10,000	0.01%	$41K	—
81	TORONTO DOMINION BANK	10,000	0.01%	$41K	-16,178 (-61.8%)
82	UBS Group AG	8,294	0.01%	$34K	-298,663 (-97.3%)
83	CITIGROUP INC	6,849	0.01%	$28K	+3,613 (+111.7%)
84	TD Waterhouse Canada Inc.	6,700	0.01%	$26K	+2,000 (+42.6%)
85	Aviso Financial Inc.	6,164	0.01%	$25K	+131 (+2.2%)
86	ASSETMARK, INC	2,500	0.00%	$10K	—
87	OSAIC HOLDINGS, INC.	1,682	0.00%	$7K	-1 (-0.1%)
88	JONES FINANCIAL COMPANIES LLLP	878	0.00%	$4K	NEW
89	FNY Investment Advisers, LLC	830	0.00%	$3K	-64,458 (-98.7%)
90	Caitong International Asset Management Co., Ltd	128	0.00%	$518	NEW
91	Physician Wealth Advisors, Inc.	111	0.00%	$450	NEW
92	Arlington Trust Co LLC	100	0.00%	$405	—
93	Tower Research Capital LLC (TRC)	78	0.00%	$316	-3,777 (-98.0%)
94	Basepoint Wealth LLC	51	0.00%	$208	—
95	SBI Securities Co., Ltd.	50	0.00%	$203	-1 (-2.0%)

Exited since 2026-03-31 (15 filers; largest 15 shown)

Solas Capital Management, LLC	−1,047,454
HRT FINANCIAL LP	−467,190
CenterBook Partners LP	−233,509
RENAISSANCE TECHNOLOGIES LLC	−117,276
Assenagon Asset Management S.A.	−99,107
AYAL Capital Advisors Ltd	−95,000
ARISTEIA CAPITAL, L.L.C.	−91,423
TWO SIGMA SECURITIES, LLC	−35,367
Caption Management, LLC	−17,299
SUSQUEHANNA INTERNATIONAL GROUP, LLP	−15,390
Corient Private Wealth LLC	−15,000
Scientech Research LLC	−13,748
Schonfeld Strategic Advisors LLC	−13,188
Balyasny Asset Management L.P.	−11,517
Ulland Investment Advisors, LLC	−1,000

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
MM Asset Management Inc.	SCHEDULE 13G/A	2026-08-14	2026-06-30	10,954,738	10.4%
MMCAP International Inc. SPC	SCHEDULE 13G/A	2026-08-14	2026-06-30	10,954,738	10.4%
DSCO Value Fund, L.P.	SCHEDULE 13G	2026-08-11	2026-06-30	5,277,631	5%
DONALD SMITH & CO., INC.	SCHEDULE 13G	2026-08-11	2026-06-30	5,277,631	5%
Xavier Majic	SCHEDULE 13G/A	2026-05-15	2026-03-31	15,930,818	15.1%
Maple Rock Capital Partners Inc.	SCHEDULE 13G/A	2026-05-15	2026-03-31	15,930,818	15.1%
Atlas Tube Canada ULC	SCHEDULE 13D/A	2025-09-23	2025-09-10	3,229,998	3.08%
Zekelman Industries, Inc.	SCHEDULE 13D/A	2025-09-23	2025-09-10	3,229,998	3.08%
Majic Xavier	SCHEDULE 13D/A	2025-08-14	2025-08-12	10,430,818	9.9%
Drake Helix Holdings, LLC	SCHEDULE 13G/A	2025-08-14	2025-06-30	381,522	0.4%
CDC Financial, Inc.	SCHEDULE 13G/A	2025-08-14	2025-06-30	5,848,780	5.4%
Stoney Lonesome HF LP	SCHEDULE 13G/A	2025-08-14	2025-06-30	5,467,258	5.1%
COGHILL CLINT D	SCHEDULE 13G/A	2025-08-14	2025-06-30	5,864,050	5.4%
COGHILL CAPITAL MANAGEMENT LLC	SCHEDULE 13G/A	2025-08-14	2025-06-30	5,467,258	5.1%
BlackRock, Inc.	SCHEDULE 13G/A	2025-04-29	2025-03-31	3,835,939	3.7%
Clint Coghill	SCHEDULE 13G	2025-04-10	2025-04-04	15,270	0%
The Drake Helix Holdings, LLC	SCHEDULE 13G	2025-04-10	2025-04-04	366,522	0.3%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.