David M. Kaye - 12 Dec 2025 Form 4 Insider Report for Birchtech Corp. (BCHT)

Reporting relationship: Director
Issuer ticker: BCHT
Reported as of: 12 Dec 2025
Net transaction value: -$0.9188
SEC form: 4
Accepted by SEC: 15 Dec 2025, 21:32:04 UTC
Prior SEC filing: 16 Jan 2024
Source filing: View source filing
Reporting owner signature: /s/ David M. Kaye

Key filing fact

David M. Kaye filed Form 4 for Birchtech Corp. (BCHT) on 15 Dec 2025.

Key facts

This page summarizes David M. Kaye's Form 4 filing for Birchtech Corp. (BCHT).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 15 Dec 2025, 21:32.

Change

Previous filing in this sequence was filed on 16 Jan 2024.
Current net transaction value: -$0.9188.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001358094 Primary reporting owner

Kaye David M

Relationship: Director
Address: 639 KNOLLWOOD TERRACE, WESTFIELD
Signature: /s/ David M. Kaye
Signature date: 15 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BCHT transaction

Common Stock

Options Exercise

Transaction value: $145,000
Shares: +250,000
Change %: +91%
Price: $0.5800
Shares after: 525,356
Date: 12 Dec 2025
Ownership: Direct
Footnotes: F1

BCHT transaction

Common Stock

Tax liability

Transaction value: $145,001
Shares: -155,214
Change %: -30%
Price: $0.9342
Shares after: 370,142
Date: 12 Dec 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

BCHT transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -250,000
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 12 Dec 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 250,000
Exercise price: $0.5800

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 250,000 shares of common stock, pursuant to which 155,214 shares were withheld by the Issuer with a VWAP of $0.9342 per share to pay the exercise price of $0.58 per share, resulting in 94,786 shares of common stock being issued to the Reporting Person on a net basis.