BCHT · Birchtech Corp.

Reflects shares of the Issuer's common stock purchased for an aggregate of $750,000 which were purchased by the Reporting Person in a public offering of 6,250,000 shares of the Issuer's common stock at a purchase price of $2.40 per share which closed on February 27, 2026.

Share amount reflects the Issuer's 1-for-5 reverse stock split effective December 26, 2025.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 310,427 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 189,573 shares of common stock being issued to the Reporting Person on a net basis.

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.

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.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 310,427 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 189,573 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option covering 300,000 shares (from an option to purchase up to 500,000 shares), pursuant to which 190,560 shares were withheld by the Issuer with a VWAP of $0.9131 per share to pay the exercise price of $0.58 per share, resulting in 109,440 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option covering 300,000 shares (from an option to purchase up to 500,000 shares), pursuant to which 190,560 shares were withheld by the Issuer with a VWAP of $0.9131 per share to pay the exercise price of $0.58 per share, resulting in 109,440 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 181,022 shares were withheld by the Issuer with a VWAP of $0.5248 per share to pay the exercise price of $0.19 per share, resulting in 318,978 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 181,022 shares were withheld by the Issuer with a VWAP of $0.5248 per share to pay the exercise price of $0.19 per share, resulting in 318,978 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 181,022 shares were withheld by the Issuer with a VWAP of $0.5248 per share to pay the exercise price of $0.19 per share, resulting in 318,978 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 500,000 shares of common stock, pursuant to which 181,022 shares were withheld by the Issuer with a VWAP of $0.5248 per share to pay the exercise price of $0.19 per share, resulting in 318,978 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 600,000 shares of common stock, pursuant to which 245,418 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.27 per share, resulting in 354,582 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 1,000,000 shares of common stock, pursuant to which 681,715 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.45 per share, resulting in 318,285 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 600,000 shares of common stock, pursuant to which 245,418 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.27 per share, resulting in 354,582 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 1,000,000 shares of common stock, pursuant to which 681,715 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.45 per share, resulting in 318,285 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 1,500,000 shares of common stock, pursuant to which 613,544 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.27 per share, resulting in 886,456 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 1,500,000 shares of common stock, pursuant to which 613,544 shares were withheld by the Issuer with a VWAP of $0.6601 per share to pay the exercise price of $0.27 per share, resulting in 886,456 shares of common stock being issued to the Reporting Person on a net basis.

Represents shares of the Issuer's common stock underlying restricted share units ("RSUs") granted on January 15, 2024. The RSUs are scheduled to vest one year from the grant date, January 15, 2025, and shall be settled 100% in shares of the Issuer's common stock. The reporting person does not intend to report the vesting of the RSUs nor the delivery of the shares of common stock.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 13,750 shares of common stock, pursuant to which 3,472 shares were withheld by the Issuer with a VWAP of $0.9902 per share to pay the exercise price of $0.25 per share, resulting in 10,278 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 6,250 shares of common stock, pursuant to which 1,578 shares were withheld by the Issuer with a VWAP of $0.9902 per share to pay the exercise price of $0.25 per share, resulting in 4,672 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 13,750 shares of common stock, pursuant to which 3,472 shares were withheld by the Issuer with a VWAP of $0.9902 per share to pay the exercise price of $0.25 per share, resulting in 10,278 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 6,250 shares of common stock, pursuant to which 1,578 shares were withheld by the Issuer with a VWAP of $0.9902 per share to pay the exercise price of $0.25 per share, resulting in 4,672 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 13,750 shares of common stock, pursuant to which 4,646 shares were withheld by the Issuer with a VWAP of $0.9768 per share to pay the exercise price of $0.33 per share, resulting in 9,104 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 6,250 shares of common stock, pursuant to which 2,112 shares were withheld by the Issuer with a VWAP of $0.9768 per share to pay the exercise price of $0.33 per share, resulting in 4,138 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 6,250 shares of common stock, pursuant to which 2,112 shares were withheld by the Issuer with a VWAP of $0.9768 per share to pay the exercise price of $0.33 per share, resulting in 4,138 shares of common stock being issued to the Reporting Person on a net basis.

Reflects shares of the Issuer's common stock acquired by the Reporting Person through the cashless exercise of an option to acquire 13,750 shares of common stock, pursuant to which 4,646 shares were withheld by the Issuer with a VWAP of $0.9768 per share to pay the exercise price of $0.33 per share, resulting in 9,104 shares of common stock being issued to the Reporting Person on a net basis.