Birchtech

BIRCHTECH CORP.
1810 Jester Drive
Corsicana, Texas 75109

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON JULY 23, 2026

To the Stockholders of Birchtech Corp.:

The annual meeting of stockholders (the "Annual Meeting") of Birchtech Corp. (the "Company") will be held exclusively online via the Internet on Thursday, July 23, 2026, at 10:00 a.m. Eastern Time. The purposes of the meeting are:

1. To elect four director nominees listed in the accompanying Proxy Statement, to hold office until their successors have been elected and qualified or until the earlier of their resignation or removal (Proposal 1);
2. To ratify the appointment of Rosenberg Rich Baker Berman, P.A. as our independent registered public accounting firm for the year ending December 31, 2026 (Proposal 2);
3. To approve, on an advisory basis, the compensation of our named executive officers (Proposal 3);
4. To approve an amendment to our certificate of incorporation, as amended to the date of this proxy statement (the "Certificate of Incorporation"), to decrease the number of authorized shares of our common stock from 150,000,000 shares to 50,000,000 shares (Proposal 4);
5. To transact such other business as may properly come before the Annual Meeting or any adjournments or postponements thereof.

Our board of directors has fixed the close of business on June 10, 2026 as the record date (the "Record Date") for determining holders of our common stock entitled to notice of, and to vote at, the Annual Meeting or any adjournments or postponements thereof.

The Annual Meeting will be presented exclusively online at www.virtualshareholdermeeting.com/BCHT2026. You will be able to attend the Annual Meeting online, vote your shares electronically, and submit your questions to management during the Annual Meeting by visiting the aforementioned website.

You may also vote your shares by marking your votes on the proxy card, signing and dating it, and mailing it in the envelope provided. In addition, you may vote by telephone: call toll-free 1-800-690-6903 and follow the instructions provided by the recorded message. You will need your proxy card available if you vote by telephone. You may also vote by Internet: access www.proxyvote.com and follow the steps outlined on the secure website.

Your vote is important. Whether or not you plan to attend the virtual Annual Meeting, please vote in accordance with the instructions in the Notice or by completing, signing, dating, and returning your proxy card or voting instruction form so that your shares will be represented at the Annual Meeting.

This Notice and Proxy Statement are dated June 24, 2026 and are first being mailed to shareholders on or about June 24, 2026. Please note that this Notice, Proxy Statement and Annual Report on Form 10-K for the year ended December 31, 2025 are also available at http://www.birchtech.com.

By order of the Board of Directors,

Corsicana, Texas
Dated: June 24, 2026

RICHARD MACPHERSON
President and Chief Executive Officer