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.
Hydro turbines in Alberta, wind farms in Washington, and gas peakers in Western Australia—TransAlta’s diversified fleet adds layers of complexity to every disclosure. Tracking environmental liabilities, capacity contracts, and fuel-hedge positions across six business segments can turn a 40-F into a week-long project. If you have ever searched for “TransAlta insider trading Form 4 transactions” only to wade through pages of footnotes, you know the challenge.
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FMR LLC32,248,431 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 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.
Bank of Nova Scotia reported beneficial ownership of 13,865,341 shares of TransAlta Corp., representing
The Goldman Sachs Group, Inc. and Goldman Sachs & Co. LLC filed a Schedule 13G reporting beneficial ownership of 16,350,772.73 shares of TransAlta Corporation common stock, representing 5.5% of the class as of the 06/30/2025 event date.
The filing reports 0 sole voting and dispositive power and 16,350,772.73 shares of shared voting and shared dispositive power. The submission includes a joint filing agreement (Exhibit 99.1) and identifies Goldman Sachs & Co. LLC as a subsidiary that may be deemed to beneficially own the securities (Exhibit 99.2). The signatory certified the holdings are held in the ordinary course and not to influence control; signatures dated 07/17/2025.
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