Welcome to our dedicated page for TransAlta SEC filings (Ticker: TAC), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
The TransAlta Corporation (TAC) SEC filings page on Stock Titan provides access to the company’s regulatory disclosures as a foreign private issuer in the United States. TransAlta files under the Securities Exchange Act of 1934 using Form 40-F for annual reporting and furnishes current information on Form 6-K. These filings complement the company’s Canadian disclosures and offer investors a centralized view of material developments.
Recent Form 6-K submissions include items such as dividend declarations, notices related to plant operations, long-term agreements, acquisitions, underwriting agreements and supplemental indentures. Examples include filings describing the planned temporary mothballing of Sheerness Unit 1, a Department of Energy order regarding Centralia Unit 2, a long-term agreement to enable coal-to-gas conversion at Centralia, and a definitive agreement to acquire a 310 megawatt contracted Ontario gas portfolio. Other 6-Ks incorporate by reference documents like management’s discussion and analysis, interim financial statements, consents of auditors and transaction-related agreements.
For a power producer with multiple business segments—Hydro, Wind & Solar, Gas, Energy Transition, Energy Marketing and Corporate—these filings help explain how TransAlta’s portfolio, capital structure and risk profile change over time. Investors can review segment performance, non-IFRS measures, credit facility arrangements and other details through documents referenced in the SEC submissions.
On Stock Titan, SEC filings for TAC are updated as they appear on EDGAR, and AI-powered tools summarize key points to make lengthy documents more accessible. Users can quickly see what each filing covers, whether it relates to financing, asset transactions, operational changes or governance matters, and then drill down into the full text as needed. This page is a resource for anyone analyzing TransAlta’s regulatory history, financial reporting and material corporate events.
TransAlta Corporation filed a Form 6-K for November 2025, signed by its Executive Vice President Finance and Chief Financial Officer, Joel Hunter. The report includes an exhibit titled "TransAlta to Acquire 310 MW Contracted Ontario Gas Portfolio for $95 million," indicating a planned acquisition of a sizable, contracted natural gas power portfolio in Ontario. This suggests an expansion of TransAlta's generation assets through a contracted capacity addition of 310 megawatts.
TransAlta Corporation (TAC) received an amended Schedule 13G (Amendment No. 2) from Millennium Management affiliates and Integrated Core Strategies (Asia) Pte. Ltd., reporting passive beneficial ownership as of 09/30/2025.
Millennium Management LLC, Millennium Group Management LLC, and Israel A. Englander each report beneficial ownership of 13,115,689 common shares, representing 4.4% of the class, with shared voting and dispositive power. Integrated Core Strategies (Asia) Pte. Ltd. reports 11,672,205 common shares, representing 3.9% of the class, also with shared voting and dispositive power.
The filing includes the standard passive investor certification stating the shares were not acquired to change or influence control.
Goldman Sachs Group Inc. and Goldman Sachs & Co. LLC filed an amended Schedule 13G reporting beneficial ownership in TransAlta Corporation. As of 09/30/2025, they reported 7,054,299.44 common shares, representing 2.4% of the class.
The filing shows 0 shares with sole voting or dispositive power and 7,054,299.44 shares with shared voting and shared dispositive power. The signatories certified the holdings were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.
FMR LLC filed an amended Schedule 13G/A reporting beneficial ownership of 32,248,431 shares of TransAlta Corporation common stock, representing 10.9% of the class as of the event date 10/31/2025. The filing also lists Abigail P. Johnson as a reporting person.
FMR reports sole voting power over 32,097,880 shares and sole dispositive power over 32,248,431 shares. Ms. Johnson reports sole dispositive power over 32,248,431 shares and no voting power. The filers certify the shares were acquired and are held in the ordinary course and not for the purpose of changing or influencing control. One or more other persons may have rights to dividends or sale proceeds, but no such person holds more than five percent.
TransAlta Corporation filed a Form 6-K as a foreign private issuer for November 2025, signed by Executive Vice President Finance and Chief Financial Officer Joel Hunter on November 6, 2025. The filing includes an exhibit titled “TransAlta Announces President and CEO Succession”, indicating the company has announced a planned leadership transition at the president and chief executive officer level.
TransAlta Corporation filed a Form 6-K as a foreign private issuer to furnish additional financial information to investors. The filing attaches a Management’s Discussion and Analysis of Financial Condition and Results of Operations as Exhibit 99.2 and consolidated comparative interim unaudited financial statements as Exhibit 99.3, each covering the period ended Sept. 30, 2025. These documents are incorporated by reference into several existing TransAlta registration statements on Forms S-8 and F-10 under the U.S. Securities Act of 1933.
TransAlta Corp (TAC): Schedule 13G/A (Amendment No. 1) — FMR LLC and Abigail P. Johnson reported beneficial ownership of 22,621,020 common shares of TransAlta, representing 7.6% of the class as of 09/30/2025.
FMR LLC reports sole voting power over 22,461,169 shares and sole dispositive power over 22,621,020 shares; Abigail P. Johnson reports sole dispositive power over 22,621,020 shares and no voting power. The filing certifies the holdings were acquired and are held in the ordinary course and not for the purpose of changing or influencing control.
TransAlta Corporation furnished a Form 6-K for October 2025, indicating it files annual reports on Form 40-F. The report was signed by Executive Vice President Finance and Chief Financial Officer Joel Hunter on October 22, 2025. The submission includes Exhibit 99.1 titled "TransAlta Declares Dividends," providing an update on dividend actions via the accompanying exhibit.
TransAlta Corporation submitted a Form 6-K as a foreign private issuer. The filing is administrative and primarily points to an exhibit titled “TransAlta to Host Third Quarter 2025 Results Conference Call,” indicating preparation to discuss its third-quarter 2025 results with investors.