Tantech Holdings Ltd SEC filings TANH
Tantech Holdings Ltd has 294 filings in SEC EDGAR's recent list, going back to Sep 30, 2013. Its latest annual report, Form 20-F, was filed on May 14, 2026 for the period ended Dec 31, 2025. The most recent current report (Form 6-K) was filed on Oct 2, 2026. The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 6-K | Current report (foreign issuer) | Oct 2, 2026 | Oct 2, 2026 |
| 6-K | Current report (foreign issuer) | Sep 24, 2026 | Sep 24, 2026 |
| 6-K | Current report (foreign issuer) | Sep 1, 2026 | Sep 1, 2026 |
| 6-K | Current report (foreign issuer) | Aug 19, 2026 | Aug 19, 2026 |
| 6-K/A | Form 6-k/a | Aug 7, 2026 | Aug 7, 2026 |
| 6-K | Current report (foreign issuer) | Aug 6, 2026 | Aug 5, 2026 |
| 6-K | Current report (foreign issuer) | Aug 4, 2026 | Aug 4, 2026 |
| EFFECT | Filing | Jun 17, 2026 | — |
| CORRESP | Letter to the SEC | Jun 15, 2026 | — |
| F-3 | Shelf registration (foreign issuer) | Jun 9, 2026 | — |
| UPLOAD | Letter from the SEC | Jun 3, 2026 | — |
| DRS | Filing | Jun 2, 2026 | — |
| 20-F | Annual report (foreign issuer) | May 14, 2026 | Dec 31, 2025 |
| NT 20-F | Filing | May 1, 2026 | Dec 31, 2025 |
| 3 | Initial insider ownership | Apr 9, 2026 | May 29, 2025 |
| 6-K | Current report (foreign issuer) | Apr 2, 2026 | Apr 1, 2026 |
| 424B5 | Prospectus supplement | Apr 2, 2026 | — |
| 3 | Initial insider ownership | Mar 31, 2026 | May 26, 2023 |
| 3 | Initial insider ownership | Mar 31, 2026 | Jul 1, 2014 |
| 3 | Initial insider ownership | Mar 31, 2026 | Jul 1, 2014 |
| 6-K | Current report (foreign issuer) | Mar 31, 2026 | Mar 31, 2026 |
| 6-K | Current report (foreign issuer) | Mar 25, 2026 | Mar 24, 2026 |
| 424B5 | Prospectus supplement | Mar 25, 2026 | — |
| 6-K | Current report (foreign issuer) | Mar 23, 2026 | Mar 23, 2026 |
| 3 | Initial insider ownership | Mar 17, 2026 | Jun 29, 2013 |
| 6-K | Current report (foreign issuer) | Jan 15, 2026 | Jan 15, 2026 |
| 6-K | Current report (foreign issuer) | Dec 31, 2025 | Dec 31, 2025 |
| 6-K | Current report (foreign issuer) | Dec 19, 2025 | Jun 30, 2025 |
| UPLOAD | Letter from the SEC | Dec 15, 2025 | — |
| 6-K | Current report (foreign issuer) | Dec 11, 2025 | Dec 11, 2025 |
| 6-K | Current report (foreign issuer) | Oct 24, 2025 | Oct 23, 2025 |
| 6-K | Current report (foreign issuer) | Oct 17, 2025 | Oct 17, 2025 |
| 6-K | Current report (foreign issuer) | Sep 24, 2025 | Sep 24, 2025 |
| 20-F/A | Amended annual report (foreign issuer) | Sep 18, 2025 | Dec 31, 2024 |
| CORRESP | Letter to the SEC | Sep 18, 2025 | — |
| UPLOAD | Letter from the SEC | Sep 2, 2025 | — |
| 6-K | Current report (foreign issuer) | Jun 3, 2025 | Jun 2, 2025 |
| 20-F | Annual report (foreign issuer) | May 15, 2025 | Dec 31, 2024 |
| NT 20-F | Filing | May 1, 2025 | Dec 31, 2024 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 21, 2025 | — |
| 6-K | Current report (foreign issuer) | Mar 3, 2025 | Mar 3, 2025 |
| 6-K | Current report (foreign issuer) | Feb 10, 2025 | Feb 10, 2025 |
| 6-K | Current report (foreign issuer) | Jan 8, 2025 | Jan 7, 2025 |
| 6-K | Current report (foreign issuer) | Jan 6, 2025 | Jan 6, 2025 |
| 6-K | Current report (foreign issuer) | Jan 2, 2025 | Jun 30, 2024 |
| 6-K | Current report (foreign issuer) | Dec 27, 2024 | Dec 27, 2024 |
| 6-K | Current report (foreign issuer) | Dec 20, 2024 | Dec 20, 2024 |
| 6-K | Current report (foreign issuer) | Dec 16, 2024 | Dec 11, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 6, 2024 | — |
| 6-K | Current report (foreign issuer) | Sep 10, 2024 | Sep 10, 2024 |
| 6-K | Current report (foreign issuer) | Aug 28, 2024 | Aug 28, 2024 |
| 6-K/A | Form 6-k/a | Jul 29, 2024 | Jul 29, 2024 |
| 424B3 | Prospectus | Jul 26, 2024 | — |
| EFFECT | Filing | Jul 25, 2024 | — |
| CORRESP | Letter to the SEC | Jul 23, 2024 | — |
| F-1/A | Form f-1/a | Jul 22, 2024 | — |
| UPLOAD | Letter from the SEC | Jul 22, 2024 | — |
| F-1 | Registration statement (foreign issuer) | Jul 12, 2024 | — |
| 6-K | Current report (foreign issuer) | Jun 17, 2024 | Jun 17, 2024 |
| 20-F | Annual report (foreign issuer) | Jun 11, 2024 | Dec 31, 2023 |
| 6-K | Current report (foreign issuer) | May 21, 2024 | May 21, 2024 |
| SC 13G | Ownership over 5% (passive) | May 8, 2024 | — |
| 6-K | Current report (foreign issuer) | May 8, 2024 | May 8, 2024 |
| SC 13G | Ownership over 5% (passive) | May 3, 2024 | — |
| NT 20-F | Filing | May 1, 2024 | Dec 31, 2023 |
| 6-K | Current report (foreign issuer) | Apr 26, 2024 | Apr 24, 2024 |
| 6-K | Current report (foreign issuer) | Mar 19, 2024 | Mar 19, 2024 |
| 6-K | Current report (foreign issuer) | Feb 29, 2024 | Feb 28, 2024 |
| 6-K | Current report (foreign issuer) | Jan 16, 2024 | Jan 16, 2024 |
| 6-K | Current report (foreign issuer) | Jan 2, 2024 | Jan 2, 2024 |
| 6-K | Current report (foreign issuer) | Dec 5, 2023 | Jun 30, 2023 |
| 6-K | Current report (foreign issuer) | Nov 20, 2023 | Nov 17, 2023 |
| 6-K | Current report (foreign issuer) | Oct 24, 2023 | Oct 24, 2023 |
| SC 13G | Ownership over 5% (passive) | Oct 16, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 13, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 12, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 12, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 12, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 12, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 10, 2023 | — |
| EFFECT | Filing | Sep 11, 2023 | — |
| CORRESP | Letter to the SEC | Sep 7, 2023 | — |
| UPLOAD | Letter from the SEC | Sep 6, 2023 | — |
| F-3 | Shelf registration (foreign issuer) | Aug 30, 2023 | — |
| 6-K | Current report (foreign issuer) | Aug 14, 2023 | Aug 14, 2023 |
| 424B5 | Prospectus supplement | Jun 30, 2023 | — |
| 6-K | Current report (foreign issuer) | Jun 30, 2023 | Jun 30, 2023 |
| 424B5 | Prospectus supplement | Jun 28, 2023 | — |
| 6-K/A | Form 6-k/a | Jun 28, 2023 | Jun 23, 2023 |
| 6-K | Current report (foreign issuer) | Jun 23, 2023 | Jun 23, 2023 |
| 20-F | Annual report (foreign issuer) | May 1, 2023 | Dec 31, 2022 |
| 6-K | Current report (foreign issuer) | Mar 24, 2023 | Mar 24, 2023 |
| UPLOAD | Letter from the SEC | Jan 24, 2023 | — |
| CORRESP | Letter to the SEC | Jan 17, 2023 | — |
| 20-F/A | Amended annual report (foreign issuer) | Jan 17, 2023 | Dec 31, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 10, 2023 | — |
| UPLOAD | Letter from the SEC | Jan 4, 2023 | — |
| 6-K | Current report (foreign issuer) | Dec 28, 2022 | Jun 30, 2022 |
| 20-F/A | Amended annual report (foreign issuer) | Dec 23, 2022 | Dec 31, 2021 |
| 6-K | Current report (foreign issuer) | Dec 21, 2022 | Dec 20, 2022 |
| 6-K | Current report (foreign issuer) | Dec 13, 2022 | Dec 13, 2022 |
| 6-K | Current report (foreign issuer) | Dec 1, 2022 | Dec 1, 2022 |
| CORRESP | Letter to the SEC | Nov 28, 2022 | — |
| 6-K | Current report (foreign issuer) | Nov 22, 2022 | Nov 22, 2022 |
| UPLOAD | Letter from the SEC | Nov 10, 2022 | — |
| 6-K | Current report (foreign issuer) | Nov 8, 2022 | Nov 8, 2022 |
| 6-K | Current report (foreign issuer) | Oct 31, 2022 | Oct 31, 2022 |
| 6-K | Current report (foreign issuer) | Oct 19, 2022 | Oct 19, 2022 |
| CORRESP | Letter to the SEC | Oct 12, 2022 | — |
| UPLOAD | Letter from the SEC | Sep 12, 2022 | — |
| 6-K | Current report (foreign issuer) | Aug 3, 2022 | Aug 3, 2022 |
| 6-K | Current report (foreign issuer) | Jul 21, 2022 | Jul 21, 2022 |
| 20-F | Annual report (foreign issuer) | Jul 18, 2022 | Dec 31, 2021 |
| 6-K | Current report (foreign issuer) | Jun 21, 2022 | Jun 21, 2022 |
| 6-K | Current report (foreign issuer) | Jun 1, 2022 | Jun 1, 2022 |
| 6-K | Current report (foreign issuer) | May 27, 2022 | May 27, 2022 |
| 6-K | Current report (foreign issuer) | May 19, 2022 | May 19, 2022 |
| NT 20-F | Form nt 20-f | May 2, 2022 | Dec 31, 2021 |
| 6-K | Current report (foreign issuer) | Apr 28, 2022 | Apr 28, 2022 |
| 6-K | Current report (foreign issuer) | Mar 22, 2022 | Mar 22, 2022 |
| 6-K | Current report (foreign issuer) | Mar 21, 2022 | Mar 21, 2022 |
| 424B5 | Prospectus supplement | Mar 18, 2022 | — |
| 424B5 | Prospectus supplement | Mar 16, 2022 | — |
| 6-K | Current report (foreign issuer) | Mar 15, 2022 | Mar 15, 2022 |
| 6-K | Current report (foreign issuer) | Mar 2, 2022 | Mar 2, 2022 |
| 6-K | Current report (foreign issuer) | Feb 25, 2022 | Feb 25, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 5, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Dec 9, 2021 | — |
| 6-K | Current report (foreign issuer) | Dec 7, 2021 | Dec 6, 2021 |
| 424B5 | Prospectus supplement | Dec 6, 2021 | — |
| 424B5 | Prospectus supplement | Dec 2, 2021 | — |
| 6-K | Current report (foreign issuer) | Nov 18, 2021 | Nov 18, 2021 |
| 6-K | Current report (foreign issuer) | Nov 4, 2021 | Nov 4, 2021 |
| 6-K | Current report (foreign issuer) | Oct 22, 2021 | Jun 30, 2021 |
| 6-K | Current report (foreign issuer) | Oct 4, 2021 | Oct 4, 2021 |
| 6-K | Current report (foreign issuer) | Sep 1, 2021 | Sep 1, 2021 |
| 6-K | Current report (foreign issuer) | Aug 9, 2021 | Aug 9, 2021 |
| 6-K | Current report (foreign issuer) | Aug 6, 2021 | Aug 6, 2021 |
| 6-K | Current report (foreign issuer) | Aug 6, 2021 | Aug 6, 2021 |
| 6-K | Current report (foreign issuer) | Jul 19, 2021 | Jul 19, 2021 |
| 6-K | Current report (foreign issuer) | Jun 8, 2021 | Jun 8, 2021 |
| 6-K/A | Form 6-k/a | Jun 7, 2021 | Jun 7, 2021 |
| 6-K | Current report (foreign issuer) | May 27, 2021 | May 27, 2021 |
| 20-F | Annual report (foreign issuer) | Apr 27, 2021 | Dec 31, 2020 |
| 424B3 | Prospectus | Dec 28, 2020 | — |
| EFFECT | Filing | Dec 23, 2020 | — |
| CORRESP | Letter to the SEC | Dec 22, 2020 | — |
| CORRESP | Letter to the SEC | Dec 22, 2020 | — |
| UPLOAD | Letter from the SEC | Dec 21, 2020 | — |
| F-3 | Shelf registration (foreign issuer) | Dec 18, 2020 | — |
| 6-K/A | Form 6-k/a | Dec 8, 2020 | Dec 8, 2020 |
| D | Filing | Dec 7, 2020 | — |
| SC 13G | Ownership over 5% (passive) | Nov 30, 2020 | — |
| 6-K | Current report (foreign issuer) | Nov 24, 2020 | Nov 24, 2020 |
| 424B5 | Prospectus supplement | Nov 24, 2020 | — |
| 6-K | Current report (foreign issuer) | Nov 20, 2020 | Nov 20, 2020 |
| 6-K | Current report (foreign issuer) | Sep 30, 2020 | Jun 30, 2020 |
| 6-K | Current report (foreign issuer) | Sep 14, 2020 | Sep 14, 2020 |
| EFFECT | Filing | Aug 31, 2020 | — |
| CORRESP | Letter to the SEC | Aug 27, 2020 | — |
| UPLOAD | Letter from the SEC | Aug 26, 2020 | — |
| F-3 | Shelf registration (foreign issuer) | Aug 20, 2020 | — |
| 6-K | Current report (foreign issuer) | Aug 12, 2020 | Aug 12, 2020 |
| EFFECT | Filing | Aug 4, 2020 | — |
| POS AM | Filing | Jul 24, 2020 | — |
| 20-F/A | Amended annual report (foreign issuer) | Jul 6, 2020 | Dec 31, 2019 |
| 20-F | Annual report (foreign issuer) | Jun 30, 2020 | Dec 31, 2019 |
| NT 20-F | Filing | Jun 12, 2020 | Dec 31, 2019 |
| 6-K | Current report (foreign issuer) | May 20, 2020 | May 20, 2020 |
| 6-K | Current report (foreign issuer) | Apr 22, 2020 | Apr 22, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2020 | — |
| 6-K | Current report (foreign issuer) | Dec 18, 2019 | Dec 18, 2019 |
| 6-K | Current report (foreign issuer) | Dec 17, 2019 | Dec 17, 2019 |
| 6-K | Current report (foreign issuer) | Dec 6, 2019 | Dec 6, 2019 |
| 6-K | Current report (foreign issuer) | Jul 29, 2019 | Jul 29, 2019 |
| 6-K | Current report (foreign issuer) | Jun 27, 2019 | Jun 27, 2019 |
| 6-K | Current report (foreign issuer) | Jun 27, 2019 | Jun 27, 2019 |
| 6-K | Current report (foreign issuer) | May 28, 2019 | May 28, 2019 |
| 20-F | Annual report (foreign issuer) | May 15, 2019 | Dec 31, 2018 |
| NT 20-F | Filing | Apr 30, 2019 | Dec 31, 2018 |
| 6-K | Current report (foreign issuer) | Apr 23, 2019 | Apr 22, 2019 |
| 6-K | Current report (foreign issuer) | Jan 30, 2019 | Jan 30, 2019 |
| 6-K | Current report (foreign issuer) | Dec 26, 2018 | Dec 26, 2018 |
| 6-K | Current report (foreign issuer) | Dec 14, 2018 | Dec 14, 2018 |
| 6-K | Current report (foreign issuer) | Dec 10, 2018 | Dec 10, 2018 |
| 6-K | Current report (foreign issuer) | Nov 7, 2018 | Nov 7, 2018 |
| 6-K | Current report (foreign issuer) | Oct 15, 2018 | Oct 15, 2018 |
| 6-K | Current report (foreign issuer) | Sep 17, 2018 | Sep 17, 2018 |
| 6-K | Current report (foreign issuer) | Aug 31, 2018 | Aug 31, 2018 |
| 6-K | Current report (foreign issuer) | Aug 23, 2018 | Aug 23, 2018 |
| 20-F | Annual report (foreign issuer) | May 11, 2018 | Dec 31, 2017 |
| NT 20-F | Filing | Apr 30, 2018 | Dec 31, 2017 |
| 6-K | Current report (foreign issuer) | Apr 19, 2018 | Apr 19, 2018 |
| 6-K | Current report (foreign issuer) | Mar 6, 2018 | Mar 6, 2018 |
| 6-K | Current report (foreign issuer) | Jan 10, 2018 | Jan 10, 2018 |
| 6-K | Current report (foreign issuer) | Dec 29, 2017 | Dec 29, 2017 |
| 6-K | Current report (foreign issuer) | Dec 21, 2017 | Dec 21, 2017 |
| 6-K | Current report (foreign issuer) | Dec 19, 2017 | Dec 19, 2017 |
| 6-K | Current report (foreign issuer) | Dec 11, 2017 | Dec 11, 2017 |
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 Organic Chemicals (SIC 2860)
- Listed as
- TANH (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- Virgin Islands, British
- Headquarters
- Zhejiang, China
- SEC filer status
- Non-accelerated filer
- SEC CIK
- 1588084
Other Industrial Organic Chemicals companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.