TransAlta (TAC) 6-K details new dividend declaration in exhibit 99.1

Rhea-AI Filing Summary

TransAlta Corporation filed a Form 6-K as a foreign private issuer for December 2025, indicating it files its annual reports on Form 40-F. The report is signed by Executive Vice President Finance and Chief Financial Officer Joel Hunter on December 12, 2025.

The filing includes an exhibit labeled 99.1 titled “TransAlta Declares Dividends.” This indicates the company has declared dividends and is providing the related details in the attached exhibit for investors and regulators.

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 December 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: December 12, 2025		/s/ Joel Hunter
		Joel Hunter
		Executive Vice President Finance and Chief Financial Officer

EXHIBIT INDEX

Exhibit Number		Description
99.1		TransAlta Declares Dividends

FAQ

What did TransAlta Corporation (TAC) file in December 2025?

TransAlta Corporation filed a Form 6-K for December 2025. The report identifies the company as a foreign private issuer and includes an exhibit titled “TransAlta Declares Dividends,” providing information on recently declared dividends.

What dividend-related information is included for TransAlta Corporation (TAC)?

The filing lists an exhibit 99.1 titled “TransAlta Declares Dividends.” This indicates TransAlta has declared dividends and is supplying the detailed terms in that exhibit for shareholders and market participants to review.

Which annual report form does TransAlta Corporation (TAC) use?

TransAlta Corporation indicates that it files its annual reports on Form 40-F. This form is used by certain Canadian and other foreign issuers that report under the multijurisdictional disclosure system with the U.S. Securities and Exchange Commission.

Who signed the December 2025 Form 6-K for TransAlta Corporation (TAC)?

The Form 6-K is signed by Joel Hunter, Executive Vice President Finance and Chief Financial Officer. His signature on December 12, 2025, confirms the company’s authorization and responsibility for the information contained in the report.

What is exhibit 99.1 in TransAlta Corporation’s (TAC) Form 6-K?

Exhibit 99.1 is titled “TransAlta Declares Dividends.” It contains the specific details of the dividends declared by TransAlta, such as the nature and timing of those dividends, as referenced in the Form 6-K exhibit index.