Algoma Steel Group Inc. (ASTL)
Nasdaq: ASTL · Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) · Sault Ste. Marie, ON · filing with the SEC since 2021
Who owns Algoma Steel Group Inc.
As filed with the SECHolders of 5% or more
4
Maple Rock Capital Partners Inc. holds 15.1% of Common Shares, no par value, as its SCHEDULE 13G/A filed May 15, 2026 says.
Directors and officers
0
report now, of 0 people on the record since . Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Maple Rock Capital Partners Inc.
SCHEDULE 13G/A · filed May 15, 2026 · Common Shares, no par value · 13.3% in Nov 7, 2025
MMCAP International Inc. SPC
SCHEDULE 13G/A · filed Aug 14, 2026 · Common Shares, no par value · 12.2% in May 15, 2026
CDC Financial, Inc.
SCHEDULE 13G/A · filed Aug 14, 2025 · Common Shares, no par value · 5.2% in Apr 10, 2025
Donald Smith & Co., Inc.
SCHEDULE 13G · filed Aug 11, 2026 · Common · 5.8% in May 13, 2026
Blackrock, Inc.
SCHEDULE 13G/A · filed Apr 29, 2025 · Common Stock · reported falling below 5%
Zekelman Industries, Inc.
SCHEDULE 13D/A · filed Sep 23, 2025 · Common Shares, without par value · reported falling below 5%
What ASTL reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Legato
A company bought · acquisition · owns, named in the 40-F filed Mar 12, 2026
Insider tradesForm 4
0sales
0purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
No open-market trade is on the record for these years.
Dollars as filed, summed by the transaction date.
People who traded in the window
No one on the roster filed an open-market trade in the window.