TransAlta (TSLTF) files Form 6-K on upcoming 2025 Investor Day

Rhea-AI Filing Summary

TransAlta Corporation filed a Form 6-K as a foreign private issuer that files annual reports under Form 40-F. The report, signed by Executive Vice President Finance and Chief Financial Officer Joel Hunter on September 18, 2025, includes Exhibit 99.1 titled “TransAlta to Host 2025 Investor Day.”

Form 6-K: How Foreign Companies Report to the SEC →

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 September 2025

Commission File Number: 001-15214

TransAlta Corporation
(Translation of registrant's name into English)

Suite 1400, 1100 – 1st Street S.E., Calgary, Alberta, T2G 1B1
(Address of principal executive office)

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 [ X ]

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.

		TransAlta Corporation
		(Registrant)
Date: September 18, 2025		/s/ Joel Hunter
		Joel Hunter
		Executive Vice President Finance and Chief Financial Officer

EXHIBIT INDEX

Exhibit Number		Description
99.1		TransAlta to Host 2025 Investor Day

FAQ

What did TransAlta (TSLTF) report in its September 2025 Form 6-K?

TransAlta reported a Form 6-K describing its status as a foreign private issuer and Form 40-F filer. The submission also attached Exhibit 99.1, titled “TransAlta to Host 2025 Investor Day,” indicating an upcoming investor-focused event in 2025.

What is the key exhibit in TransAlta (TSLTF) September 2025 Form 6-K?

The key exhibit is 99.1, titled “TransAlta to Host 2025 Investor Day.” This exhibit indicates that TransAlta plans to hold an Investor Day in 2025 and is providing related information to investors through the attached materials.

Who signed TransAlta (TSLTF)’s September 2025 Form 6-K filing?

The Form 6-K was signed by Joel Hunter, Executive Vice President Finance and Chief Financial Officer. His signature confirms that TransAlta authorized the submission of this report and the inclusion of Exhibit 99.1 regarding the 2025 Investor Day.

Under which annual report form does TransAlta (TSLTF) file as a foreign issuer?

TransAlta indicates that it files annual reports under Form 40-F rather than Form 20-F. This classification reflects its status as a foreign private issuer using Canadian disclosure standards recognized under the Securities Exchange Act of 1934.