| Proxy statement | DEF 14A | Jun 24, 2026 | FY2025 |
| Annual report | 10-K | Mar 31, 2026 | FY2025 |
| Annual report | 10-K | Mar 31, 2025 | FY2024 |
| Proxy statement | DEF 14A | Nov 27, 2024 | FY2023 |
| Annual report | 10-K | Apr 16, 2024 | FY2023 |
5 filings
Birchtech: Filings
| Proxy statement | DEF 14A | Jun 24, 2026 | FY2025 |
| Annual report | 10-K | Mar 31, 2026 | FY2025 |
| Annual report | 10-K | Mar 31, 2025 | FY2024 |
| Proxy statement | DEF 14A | Nov 27, 2024 | FY2023 |
| Annual report | 10-K | Apr 16, 2024 | FY2023 |