Maple Rock Capital Partners Inc. ownership in 9ZY / Algoma Steel Group Inc.

Algoma Steel Group Inc.

DE ˙ DB ˙ CA0156581070

4,70 € ↓ -0,06 (-1,26%)

2026-06-04
DEL PRIS

Security	DE:9ZY / Algoma Steel Group Inc.
Institution	Maple Rock Capital Partners Inc.
Latest Disclosed Ownership	15,930,818 shares
Ownership	15.10%

2026-05-15 - Maple Rock Capital Partners Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 15,930,818 shares of Algoma Steel Group Inc. (DE:9ZY). This represents 15.1 percent ownership of the company. In their previous filing dated 2025-11-07 , Maple Rock Capital Partners Inc. had reported owning 13,993,930 shares, indicating an increase of 13.84 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2026-05-15	2026-05-15	13G/A	13,993,930	15,930,818	13.84	15.10	13.53
2025-11-07	2025-11-07	13G/A	10,430,818	13,993,930	34.16	13.30	34.34
2025-08-28	2025-08-28	13G	10,430,818	10,430,818	0.00	9.90	0.00
2025-08-14	2025-08-14	13D/A	7,552,617	10,430,818	38.11	9.90	37.50
2025-05-05	2025-05-05	13D/A	6,092,091	7,552,617	23.97	7.20	22.03
2024-10-25	2024-10-25	13D	6,092,091	6,092,091	0.00	5.90	0.34
2024-02-14	2024-02-14	13G/A	6,491,299	6,092,091	-6.15	5.88	-5.92
2023-02-14	2023-02-14	13G		6,491,299		6.25

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-15	2026-03-31	13F	ALGOMA STL GROUP	COM	015658107	15,930,818	1,500,000	10.39	65,794	11.20	2.1407
2026-02-17	2025-12-31	13F	ALGOMA STL GROUP	COM	015658107	14,430,818	4,000,000	38.35	59,166	59.56	1.9545
2025-11-14	2025-09-30	13F	ALGOMA STL GROUP	COM	015658107	10,430,818	2,034,018	24.22	37,082	-35.90	1.4633
2025-08-14	2025-06-30	13F	ALGOMA STL GROUP	COM	015658107	8,396,800	1,296,800	18.26	57,854	50.34	2.8351
2025-05-15	2025-03-31	13F	ALGOMA STL GROUP	COM	015658107	7,100,000	1,007,909	16.54	38,482	-35.41	1.4090
2025-02-14	2024-12-31	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	59,581	-4.40	1.7888
2024-11-14	2024-09-30	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	62,322	46.99	1.7637
2024-08-14	2024-06-30	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	42,401	-18.02	1.4372
2024-05-15	2024-03-31	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	51,722	-15.35	2.8667
2024-02-14	2023-12-31	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	61,104	47.50	3.4808
2023-11-14	2023-09-30	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	0	0.00	41,426	-4.22	3.6439
2023-08-14	2023-06-30	13F	ALGOMA STL GROUP	COM	015658107	6,092,091	-399,208	-6.15	43,254	-17.53	3.5221
2023-05-15	2023-03-31	13F	ALGOMA STL GROUP	COM	015658107	6,491,299	0	0.00	52,450	27.45	4.6288
2023-02-14	2022-12-31	13F	ALGOMA STL GROUP	COM	015658107	6,491,299	355,000	5.79	41,155	4.14	1.6632
2022-11-14	2022-09-30	13F	ALGOMA STL GROUP	COM	015658107	6,136,299	0	0.00	39,518	-28.28	1.8874
2022-08-15	2022-06-30	13F	ALGOMA STL GROUP	COM	015658107	6,136,299	-10	-0.00	55,104	-20.18	3.2111
2022-05-16	2022-03-31	13F	ALGOMA STL GROUP	COM	015658107	6,136,309	2,045,436	50.00	69,033	56.11	3.6820
2022-02-14	2021-12-31	13F	ALGOMA STL GROUP	COM	015658107	4,090,873	4,090,873		44,222		4.7226

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.