Algoma Steel Group Inc. - Common Shares, no par value (ASTL)

CUSIP: 015658107

Q3 2025 13F Holders as of 30 Sep 2025

Security type / class
Equity / Common Shares, no par value
Total 13F shares
77,189,775
Total 13F value
$274,608,877
Holder snapshot 6 visible 7 signals
Share change
-3,124,689
Put/Call ratio
106%
SEC-reported price per share
$3.56
Number of holders
117
Value change
-$41,161,786
Number of buys
58
Open additional details 1 more signal available
Number of sells
65
Security identity Names, identifiers, and filing context for this profile. 1 source field
Shares outstanding
105,502,106

Security key

015658107

Report period

Q3 2025

Institutions

117

Top holders

10

ASTL full security history Ownership snapshot Full 13F holder table Newer quarter: Q4 2025 Previous quarter: Q2 2025 Algoma Steel Group Inc. SEC filings Algoma Steel Group Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Ownership snapshot

Top reported holders of ASTL - Algoma Steel Group Inc. - Common Shares, no par value (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
Stoney Lonesome HF LP
Disclosed value leader
Maple Rock Capital Partne...
Comparable rows
15/15
Latest evidence
10 Sep 2025
13D/G 13F Lead comparable stake: 5.4% 13D/G row: Stoney Lonesome HF LP Showing 1-6 of 15 holder rows.

Quick read

Stoney Lonesome HF LP leads the comparable SEC ownership view at 5.4%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Stoney Lonesome HF LP's linked filing trail.
Comparable ownership Top 5
Stoney Lonesome HF LP 5.4%
BlackRock, Inc. 3.7%
Zekelman Industries, Inc. 3.1%
Maple Rock Capital Partners Inc. 8%
MMCAP International Inc. SPC 6.8%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Stoney Lonesome HF LP
13D/G
COGHILL CLINT D
13D/G
5.4%
$40,931,069
5,864,050 shares
 +$2,830,397 30 Jun 2025
BlackRock, Inc.
13F 13D/G
Company
13F 13D/G
3.7%
from 13D/G
$43,992,945
6,385,043 shares
 — 30 Jun 2025
Zekelman Industries, Inc.
13D/G
13D/G
3.1%
$16,408,390
3,229,998 shares
 $0 10 Sep 2025
Maple Rock Capital Partners Inc.
13F
Company
13F
8%
$57,853,952
8,396,800 shares
 — 30 Jun 2025
MMCAP International Inc. SPC
13F
Company
13F
6.8%
$49,733,522
7,218,218 shares
 — 30 Jun 2025
DONALD SMITH & CO., INC.
13F
Company
13F
5.7%
$41,616,758
6,040,168 shares
 — 30 Jun 2025
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q3 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions
117
Shares
77,189,775
Rows available
117
Investor Option Weight % Change % SEC-reported value * Price Shares Share Change Activity Report Period

* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q3 2025 vs Q2 2025 Across Filers

Q2 2025 holders
127
Q3 2025 holders
117
Holder diff
-10
Investor Q2 2025 Shares Q3 2025 Shares Share Diff Share Chg % Q2 2025 value Q3 2025 value Value change Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .