Transalta Corp SEC filings TRNTF
Transalta Corp has 1,000 filings in SEC EDGAR's recent list, going back to Dec 3, 2004. Its latest annual report, Form 40-F, was filed on Feb 27, 2026 for the period ended Dec 31, 2025. The most recent current report (Form 6-K) was filed on Nov 3, 2026. The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G | Ownership over 5% (passive) | May 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 6, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 5, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 7, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 6, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 9, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 15, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 25, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 8, 2025 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Nov 9, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2023 | — |
| SC 13G | Ownership over 5% (passive) | May 3, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 15, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 11, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2021 | — |
| SC 13D/A | Amended ownership over 5% (active) | Nov 4, 2020 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 23, 2020 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 19, 2020 | — |
| SC 13D | Ownership over 5% (active) | Mar 2, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2020 | — |
| SC 13G | Ownership over 5% (passive) | Feb 10, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2020 | — |
| SC 13G | Ownership over 5% (passive) | Apr 22, 2019 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 19, 2019 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 11, 2019 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 10, 2019 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 27, 2019 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 15, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2019 | — |
| SC 13G | Ownership over 5% (passive) | Jan 18, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2018 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2018 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2018 | — |
| SC 13G | Ownership over 5% (passive) | Dec 11, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 17, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2016 | — |
| SC 13G | Ownership over 5% (passive) | Sep 21, 2015 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 10, 2015 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2015 | — |
| SC 13G | Ownership over 5% (passive) | Feb 10, 2015 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 2, 2015 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2014 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2014 | — |
| SC 13G | Ownership over 5% (passive) | Feb 3, 2014 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2013 | — |
| SC 13G | Ownership over 5% (passive) | Jan 10, 2013 | — |
| SC 13G | Ownership over 5% (passive) | Feb 7, 2012 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 14, 2011 | — |
| SC 13D/A | Amended ownership over 5% (active) | Aug 22, 2011 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2011 | — |
| SC 13D/A | Amended ownership over 5% (active) | Aug 30, 2010 | — |
| SC 13G | Ownership over 5% (passive) | Feb 11, 2010 | — |
| SC 13G | Ownership over 5% (passive) | Nov 9, 2009 | — |
| SC 13G | Ownership over 5% (passive) | Jul 14, 2009 | — |
| SC 13G | Ownership over 5% (passive) | May 13, 2009 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 6, 2009 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2009 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 16, 2009 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 9, 2008 | — |
| SC 13D | Ownership over 5% (active) | Sep 10, 2008 | — |
| SC 13D | Ownership over 5% (active) | Aug 15, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jul 21, 2008 | — |
| SC 13G | Ownership over 5% (passive) | May 8, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 9, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 18, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 22, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 19, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 14, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 12, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 16, 2008 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 11, 2008 | — |
| SC 13D/A | Amended ownership over 5% (active) | Dec 14, 2007 | — |
| SC 13D/A | Amended ownership over 5% (active) | Dec 7, 2007 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 23, 2007 | — |
| SC 13D | Ownership over 5% (active) | Jul 6, 2007 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2007 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2007 | — |
| SC 13G | Ownership over 5% (passive) | Nov 8, 2006 | — |
| SC 13G | Ownership over 5% (passive) | Apr 26, 2006 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2006 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 21, 2005 | — |
Showing 102 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Electric Services (SIC 4911)
- Listed as
- TAC (NYSE), TACPF (OTC), TRNTF (OTC), TSLTF (OTC)
- Fiscal year ends
- December 31
- Headquarters
- Calgary, Alberta, Canada
- SEC CIK
- 1144800
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.