Fuel Tech, Inc. SEC filings FTEK
Fuel Tech, Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Oct 28, 2003. Its latest annual report, Form 10-K, was filed on Mar 3, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 3, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 3, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 7, 2026 | — |
| 4 | Insider transaction | Sep 3, 2026 | Sep 1, 2026 |
| 3 | Initial insider ownership | Aug 19, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 6, 2026 | — |
| 4 | Insider transaction | Mar 27, 2026 | Mar 24, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 24, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 24, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 3, 2025 | — |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 144 | Notice of proposed sale | Jun 4, 2025 | — |
| 4 | Insider transaction | Apr 1, 2025 | Mar 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| 4 | Insider transaction | Nov 20, 2024 | Nov 19, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 15, 2024 |
| 4 | Insider transaction | Nov 18, 2024 | Nov 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Aug 30, 2024 | Aug 28, 2024 |
| 4 | Insider transaction | Aug 21, 2024 | Aug 12, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 5, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 5, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 5, 2024 |
| 4 | Insider transaction | Mar 4, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Mar 4, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Mar 4, 2024 | Feb 29, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2024 | — |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 7, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2023 | — |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | Jun 6, 2022 | Jun 2, 2022 |
| 4 | Insider transaction | May 19, 2022 | May 17, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Jan 10, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Feb 10, 2021 | — |
| 4 | Insider transaction | Jan 4, 2021 | Dec 31, 2020 |
| 4 | Insider transaction | Dec 29, 2020 | Dec 23, 2020 |
| 4 | Insider transaction | Dec 28, 2020 | Dec 22, 2020 |
| 4 | Insider transaction | Dec 28, 2020 | Dec 22, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Dec 7, 2020 | — |
| 4 | Insider transaction | Dec 4, 2020 | Dec 2, 2020 |
| 4 | Insider transaction | Nov 30, 2020 | Nov 25, 2020 |
| 4 | Insider transaction | Nov 27, 2020 | Nov 24, 2020 |
| 4 | Insider transaction | Nov 27, 2020 | Nov 24, 2020 |
| 4 | Insider transaction | Sep 28, 2020 | Sep 25, 2020 |
| 4 | Insider transaction | Sep 24, 2020 | Sep 24, 2020 |
| 3 | Initial insider ownership | Mar 26, 2020 | Mar 14, 2020 |
| 4 | Insider transaction | Mar 18, 2020 | Mar 17, 2020 |
| 4 | Insider transaction | Mar 17, 2020 | Mar 16, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 3, 2020 | — |
| 4 | Insider transaction | Dec 17, 2019 | Dec 16, 2019 |
| 4 | Insider transaction | Dec 17, 2019 | Dec 16, 2019 |
| 4 | Insider transaction | Sep 26, 2019 | Sep 26, 2019 |
| 4 | Insider transaction | Sep 25, 2019 | Sep 25, 2019 |
| 4 | Insider transaction | Sep 6, 2019 | Sep 6, 2019 |
| 4 | Insider transaction | Aug 28, 2019 | Aug 28, 2019 |
| 4 | Insider transaction | Jun 18, 2019 | Jun 18, 2019 |
| 4 | Insider transaction | May 22, 2019 | May 22, 2019 |
| 4 | Insider transaction | May 20, 2019 | May 17, 2019 |
| 4 | Insider transaction | May 20, 2019 | May 17, 2019 |
| 4 | Insider transaction | May 20, 2019 | Aug 23, 2018 |
| 4 | Insider transaction | May 20, 2019 | May 16, 2019 |
| 4 | Insider transaction | May 17, 2019 | May 17, 2019 |
| 4 | Insider transaction | May 17, 2019 | May 17, 2019 |
| 4 | Insider transaction | Mar 25, 2019 | Mar 21, 2019 |
| 4 | Insider transaction | Mar 25, 2019 | Mar 22, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 28, 2019 | — |
| 4 | Insider transaction | Aug 24, 2018 | Aug 23, 2018 |
| 4 | Insider transaction | Aug 23, 2018 | Aug 22, 2018 |
| 4 | Insider transaction | Jul 6, 2018 | Jun 29, 2018 |
| 5 | Annual insider ownership | Mar 26, 2018 | Dec 31, 2017 |
| 3 | Initial insider ownership | Mar 20, 2018 | Mar 8, 2018 |
| 4 | Insider transaction | Feb 28, 2018 | Feb 26, 2018 |
| 4 | Insider transaction | Feb 28, 2018 | Feb 26, 2018 |
| 4 | Insider transaction | Feb 28, 2018 | Feb 26, 2018 |
| SC 13G | Ownership over 5% (passive) | Feb 1, 2018 | — |
| 4 | Insider transaction | Dec 18, 2017 | Dec 15, 2017 |
| 4 | Insider transaction | Dec 18, 2017 | Dec 15, 2017 |
| 4 | Insider transaction | Dec 13, 2017 | Dec 12, 2017 |
| 4 | Insider transaction | Dec 8, 2017 | Dec 7, 2017 |
| 4 | Insider transaction | Dec 8, 2017 | Dec 7, 2017 |
| 4 | Insider transaction | Dec 8, 2017 | Dec 7, 2017 |
| 4 | Insider transaction | Dec 8, 2017 | Dec 7, 2017 |
| 3 | Initial insider ownership | Nov 14, 2017 | Nov 7, 2017 |
| 4 | Insider transaction | Sep 19, 2017 | Sep 15, 2017 |
| 4 | Insider transaction | Sep 18, 2017 | Sep 14, 2017 |
| 4 | Insider transaction | Sep 6, 2017 | Sep 1, 2017 |
| 4 | Insider transaction | Sep 6, 2017 | Sep 5, 2017 |
| 4 | Insider transaction | Sep 5, 2017 | Aug 31, 2017 |
| 4 | Insider transaction | Jun 30, 2017 | Jun 28, 2017 |
| 4 | Insider transaction | Jun 29, 2017 | Jun 28, 2017 |
| 4 | Insider transaction | Apr 27, 2017 | Apr 26, 2017 |
| 4 | Insider transaction | Mar 28, 2017 | Mar 27, 2017 |
| 4 | Insider transaction | Mar 17, 2017 | Mar 15, 2017 |
| 4 | Insider transaction | Mar 13, 2017 | Mar 12, 2017 |
| 4 | Insider transaction | Feb 24, 2017 | Feb 22, 2017 |
| 4 | Insider transaction | Feb 23, 2017 | Feb 22, 2017 |
| 4 | Insider transaction | Feb 23, 2017 | Feb 22, 2017 |
| 3 | Initial insider ownership | Feb 16, 2017 | Feb 6, 2017 |
| 4 | Insider transaction | May 23, 2016 | May 20, 2016 |
| 4 | Insider transaction | May 23, 2016 | May 20, 2016 |
| 4 | Insider transaction | May 23, 2016 | May 20, 2016 |
| 4 | Insider transaction | Apr 18, 2016 | Mar 21, 2016 |
| 3 | Initial insider ownership | Apr 11, 2016 | Mar 31, 2016 |
| 4 | Insider transaction | Apr 6, 2016 | Mar 31, 2016 |
| 3 | Initial insider ownership | Apr 6, 2016 | Mar 27, 2015 |
| 4 | Insider transaction | Mar 22, 2016 | Mar 21, 2016 |
| 4 | Insider transaction | Mar 22, 2016 | Mar 21, 2016 |
| 4 | Insider transaction | Mar 22, 2016 | Mar 21, 2016 |
| 4 | Insider transaction | Mar 16, 2016 | Mar 16, 2016 |
| 4 | Insider transaction | Mar 14, 2016 | Mar 14, 2016 |
| 4 | Insider transaction | Mar 3, 2016 | Mar 1, 2016 |
| 4 | Insider transaction | Mar 3, 2016 | Mar 1, 2016 |
| 4 | Insider transaction | Mar 3, 2016 | Mar 1, 2016 |
| 4 | Insider transaction | Jan 4, 2016 | Dec 30, 2015 |
| 4 | Insider transaction | Jan 4, 2016 | Dec 30, 2015 |
| 4 | Insider transaction | Jan 4, 2016 | Dec 30, 2015 |
| 5 | Annual insider ownership | Jul 6, 2015 | Dec 31, 2014 |
| 4 | Insider transaction | Jul 6, 2015 | Mar 16, 2015 |
| 4 | Insider transaction | Jul 6, 2015 | Mar 9, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | May 26, 2015 | May 22, 2015 |
| 4 | Insider transaction | Apr 20, 2015 | Apr 15, 2015 |
| 4 | Insider transaction | Apr 9, 2015 | Mar 31, 2015 |
| 4 | Insider transaction | Apr 1, 2015 | Apr 1, 2015 |
| 4 | Insider transaction | Mar 30, 2015 | Mar 26, 2015 |
| 4 | Insider transaction | Mar 30, 2015 | Mar 26, 2015 |
| 4 | Insider transaction | Mar 30, 2015 | Mar 26, 2015 |
| 4 | Insider transaction | Mar 30, 2015 | Mar 26, 2015 |
| 4 | Insider transaction | Mar 10, 2015 | Feb 25, 2015 |
| 4 | Insider transaction | Mar 10, 2015 | Feb 25, 2015 |
| 4 | Insider transaction | Mar 10, 2015 | Feb 25, 2015 |
| 4 | Insider transaction | Mar 10, 2015 | Feb 25, 2015 |
| 4 | Insider transaction | Dec 30, 2014 | Dec 29, 2014 |
| 5/A | Form 5/a submission | Oct 22, 2014 | Dec 31, 2012 |
| 4/A | Form 4/a submission | Oct 22, 2014 | Sep 24, 2014 |
| 4/A | Form 4/a submission | Oct 22, 2014 | Jun 2, 2010 |
| 4 | Insider transaction | Sep 30, 2014 | Sep 26, 2014 |
| 4/A | Form 4/a submission | Sep 30, 2014 | May 21, 2010 |
| 4/A | Form 4/a submission | Sep 30, 2014 | May 13, 2010 |
| 4/A | Form 4/a submission | Sep 30, 2014 | May 11, 2010 |
| 4 | Insider transaction | Sep 25, 2014 | Sep 24, 2014 |
| 4 | Insider transaction | Sep 24, 2014 | Sep 23, 2014 |
| 4 | Insider transaction | Sep 23, 2014 | Sep 22, 2014 |
| 4 | Insider transaction | Sep 18, 2014 | Aug 18, 2014 |
| 4 | Insider transaction | Aug 8, 2014 | May 30, 2014 |
| 4 | Insider transaction | Aug 6, 2014 | Jun 2, 2014 |
| 4 | Insider transaction | Aug 6, 2014 | May 30, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4 | Insider transaction | May 28, 2014 | May 23, 2014 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2012 |
| 4 | Insider transaction | Mar 14, 2014 | Mar 12, 2014 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 15, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Apr 10, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 9, 2012 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2010 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Apr 10, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 15, 2013 |
| 4 | Insider transaction | Mar 14, 2014 | Mar 12, 2014 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 9, 2012 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2012 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2010 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Apr 10, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 15, 2013 |
| 4 | Insider transaction | Mar 14, 2014 | Mar 12, 2014 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 9, 2012 |
| 4 | Insider transaction | Mar 14, 2014 | Mar 12, 2014 |
| 4 | Insider transaction | Mar 14, 2014 | Dec 21, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2012 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Dec 21, 2010 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Apr 10, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 15, 2013 |
| 4/A | Form 4/a submission | Mar 14, 2014 | Mar 9, 2012 |
| 4 | Insider transaction | Dec 10, 2013 | Dec 4, 2013 |
| 4 | Insider transaction | Aug 14, 2013 | Aug 12, 2013 |
| 4 | Insider transaction | May 28, 2013 | May 24, 2013 |
| 4 | Insider transaction | May 28, 2013 | May 24, 2013 |
| 4 | Insider transaction | May 28, 2013 | May 24, 2013 |
Showing 200 filings, the most recent 200. 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
- Industrial & Commercial Fans & Blowers & Air Purifing Equip (SIC 3564)
- Listed as
- FTEK (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Warrenville, IL
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 846913
- Former names
- FUEL TECH N V (until Oct 5, 2006)
Other Industrial & Commercial Fans & Blowers & Air Purifing Equip companies
- Madison Air Solutions Corp MAIR
- DONALDSON Co INC DCI
- Ceco Environmental Corp CECO
- Perma-Pipe International Holdings, Inc. PPIH
- Kronos Advanced Technologies Inc KNOS
All 6 Industrial & Commercial Fans & Blowers & Air Purifing Equip companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.