6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2025

Commission File Number 001-40924

ALGOMA STEEL GROUP INC.

(Exact name of Registrant as specified in its charter)

N/A

(Translation ofRegistrant’s name into English)

105 West Street

Sault Ste. Marie, Ontario

P6A 7B4, Canada

(705) 945-2351

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☐   Form 40-F ☒

EXHIBIT INDEX

Exhibit Number	Description
99.1	Press release dated June 24, 2025.
99.2	Voting Results of Annual General Meeting.

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Algoma Steel Group Inc.
Date: June 24, 2025	By:	/s/ John Naccarato
		Name: John Naccarato
		Title: Vice President Strategy and Chief Legal Officer

3

EX-99.1

Exhibit 99.1

MEDIA RELEASE

June 24, 2025

Algoma Steel Group Inc. Announces Results of Voting at Annual Meeting of Shareholders

SAULT STE. MARIE, ONTARIO (June 24, 2025) – Algoma Steel Group Inc. (NASDAQ: ASTL; TSX: ASTL) (“Algoma” or “the Company”), a leading Canadian producer of hot and cold rolled steel sheet and plate products, announced today the results of voting at its annual meeting of shareholders (the “Meeting”) held on June 24, 2025.

All of the nominees listed in the management information circular prepared in connection with the Meeting were elected as directors of the Company. The Company received proxies and virtual votes at the Meeting as set out below:

Nominee	Votes For		Votes Withheld		Total Votes
Mary Anne Bueschkens		63,288,046		1,619,736		64,907,782
Sean Donnelly		63,618,650		1,289,132		64,907,782
Michael Garcia		63,619,558		1,288,224		64,907,782
James Gouin		63,618,100		1,289,682		64,907,782
Andy Harshaw		63,514,669		1,393,113		64,907,782
Sanjay Nakra		63,563,641		1,344,141		64,907,782
Melinda J. Newman		63,512,570		1,395,212		64,907,782
Eric S. Rosenfeld		62,962,411		1,945,371		64,907,782
Gale Rubenstein		63,480,639		1,427,143		64,907,782
David D. Sgro		59,221,098		5,686,684		64,907,782

The Company reports that the appointment of Deloitte LLP as the Company’s auditors for the 2025 calendar year was passed by a majority of the votes represented at the Meeting.

The Company also reports that the non-binding advisory resolution on executive compensation, outlined in the management information circular dated May 1, 2025, was approved by a majority of votes at the Meeting. The circular is available on SEDAR+ and the Securities and Exchange Commission’s (“SEC”) EDGAR website. The Company’s full report of voting results on matters presented at the Meeting can be found under the Company’s profile on SEDAR+ at www.sedarplus.ca and on the SEC’s EDGAR website at www.sec.gov.

Cautionary Statement Regarding Forward-Looking Statements

This news release contains “forward-looking information” under applicable Canadian securities legislation and “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 (collectively, “forward-looking statements”), including statements regarding Algoma’s transition to electric arc furnace (EAF) steelmaking, Algoma’s future as a leading producer of green steel, Algoma’s modernization of its plate mill facilities, transformation journey, ability to deliver greater and long-term value, ability to offer North America a secure steel supply and a sustainable future, and investment in its people, and processes. These forward-looking statements generally are identified by the words “believe,” “project,” “expect,” “anticipate,” “estimate,” “intend,” “strategy,” “future,” “opportunity,” “plan,” “design,” “pipeline,” “may,” “should,” “will,” “would,” “will be,” “will continue,” “will likely result,” and similar expressions. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions. Many factors could cause actual future events to differ materially from the forward-looking statements in this document. Readers should also consider the other risks and uncertainties set forth in the section entitled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Information” in Algoma’s Annual Information Form, filed by Algoma with applicable Canadian securities regulatory authorities (available under the company’s SEDAR+ profile at www.sedarplus.com) and with the SEC, as part of Algoma’s Annual Report on Form 40-F (available at www.sec.gov), as well as in Algoma’s current reports with the Canadian securities regulatory authorities and SEC. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and Algoma assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

About Algoma Steel

Based in Sault Ste. Marie, Ontario, Canada, Algoma is a fully integrated producer of hot and cold rolled steel products, including sheet and plate. Driven by a purpose to build better lives and a greener future, Algoma is positioned to deliver responsive, customer-driven product solutions to applications in the automotive, construction, energy, defense, and manufacturing sectors. Algoma is a key supplier of steel products to customers in North America and is the only producer of discrete plate products in Canada. Its state-of-the-art Direct Strip Production Complex (“DSPC”) is one of the lowest-cost producers of hot rolled sheet steel (HRC) in North America.

Algoma is on a transformation journey, modernizing its plate mill and adopting electric arc technology that builds on the strong principles of recycling and environmental stewardship to significantly lower carbon emissions. Today, Algoma is investing in its people and processes, working safely, as a team to become one of North America’s leading producers of green steel.

As a founding industry in their community, Algoma is drawing on the best of its rich steelmaking tradition to deliver greater value, offering North America the comfort of a secure steel supply and a sustainable future.

For more information, please contact:

Michael Moraca

Vice President – Corporate Development & Treasurer

Phone: 705.945.3300

E-mail: IR@www.algoma.com

EX-99.2

Exhibit 99.2

ALGOMA STEEL GROUP INC.

(the “Company”)

Annual General Meeting of Shareholders

Held on June 24, 2025

REPORT OF VOTING RESULTS

Pursuant to section 11.3 of National Instrument 51-102 – Continuous DisclosureObligations, this report describes the matters decided at the 2025 Annual General Meeting of Shareholders of the Company held virtually on June 24, 2025. All matters voted upon at the Annual General Meeting of Shareholders of the Company were voted upon by proxy or virtually at the meeting. Full details of the matters are set out in the Company’s management information circular dated May 1, 2025, which is available on SEDAR+ at www.sedarplus.ca and on EDGAR at www.sec.gov.

1.	ELECTION OF DIRECTORS

Each of the following individuals were elected as directors of the Company for a term expiring at the conclusion of the next annual meeting of shareholders of the Company, or until their successors are elected or appointed. The voting results were as follows:

			% of					% of
			Votes			Votes		Votes
Nominee	Votes For		For			Withheld		Withheld
Mary Anne Bueschkens		63,288,046		97.505	%		1,619,736		2.495	%
Sean Donnelly		63,618,650		98.014	%		1,289,132		1.986	%
Michael Garcia		63,619,558		98.015	%		1,288,224		1.985	%
James Gouin		63,618,100		98.013	%		1,289,682		1.987	%
Andy Harshaw		63,514,669		97.854	%		1,393,113		2.146	%
Sanjay Nakra		63,563,641		97.929	%		1,344,141		2.071	%
Melinda J. Newman		63,512,570		97.850	%		1,395,212		2.150	%
Eric S. Rosenfeld		62,962,411		97.003	%		1,945,371		2.997	%
Gale Rubenstein		63,480,639		97.801	%		1,427,143		2.199	%
David D. Sgro		59,221,098		91.239	%		5,686,684		8.761	%
2.	APPOINTMENT OF AUDITOR
---	---

Deloitte LLP was appointed as the auditor of the Company until the next annual meeting of the shareholders of the Company or until its successor is appointed and the directors of the Company were authorized to fix the remuneration of such auditor. The voting results were as follows:

	% Votes			# Votes		% Votes
# Votes For	For			Withheld		Withheld
73,260,620		99.862	%		101,428		0.138	%
3.	ADVISORY VOTE ON APPROACH TO EXECUTIVE COMPENSATION
---	---

A non-binding advisory resolution on the Company’s approach to executive compensation, the full text of which is set out in Company’s management information circular dated May 1, 2025, was approved, with the outcome of the vote being as follows:

	% Votes			# Votes		% Votes
# Votes For	For			Against		Against
62,305,187		95.990	%		2,602,596		4.010	%
Dated this 24th day of June, 2025.
---	---
ALGOMA STEEL GROUP INC.
By:	`/s/ Rajat Marwah
	Name: Rajat Marwah
	Title: Chief Financial Officer