Christopher Greenberg
Chairman of the Board at Birchtech Corp.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Birchtech Corp., 3 years.
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Birchtech Corp. December 30, 202494.1%
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Birchtech Corp. December 5, 202398.2%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Feb 1, 2023 | Birchtech Corp. | Option exercise | +600,000 | $0.27 | $162,000 |
| Feb 1, 2023 | Birchtech Corp. | Option exercise | +250,000 | $0.19 | $47,500 |
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