Material Modification to Rights of Security Holders. To the extent required by

CFO — Michael Mioska: The filing is an amendment to disclose the finalized compensation terms for the recently appointed CFO, Michael Mioska, rather than reporting a new departure or election.

CFO — Michael Mioska: The CFO was terminated by the company (a departure) and immediately replaced by an external hire, indicating a change in financial leadership without a stated disagreement.

Entry into a Material Definitive Agreement. On February 25, 2026, Birchtech Corp. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Lake Street Capital Markets, LLC, as representative of the several underwriters named therein (collectively, the “Underwriters”), relating to the public offering of 6,250,000 shares (the “Shares”) of the Company’s common stock, par value $0.001 per share, at a purchase price per share of $2.40 (the “Offering Price”). Pursu…

Material Modification to Rights of Security Holders. To the extent required by

Chairman of the Board — Christopher Greenberg: The Chairman resigned to pursue other business interests with no disagreement, and an interim successor (the CEO) was immediately appointed, indicating an orderly transition rather than a sudden loss.

Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review. In connection with the December 31, 2024 year-end audit of Birchtech Corp. (the “Company”), the Company has concluded, in consultation with Rosenberg Rich Baker Berman, P.A., the Company’s independent registered public accounting firm since September 2023 (“Rosenberg Rich”), that certain revenue during the year ended December 31, 2022 was under-recognized in the previously reported fi…

Results of Operations and Financial Condition. On March 4, 2025, Birchtech Corp. (the “Company”) issued a press release providing preliminary unaudited revenue information of the Company for the year ended December 31, 2024 and preliminary revenue guidance for the year ending December 31, 2025. The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this report, including the press release furnished as Exhib…

Other Events. Effective as of October 8, 2024, Birchtech Corp. (formerly Midwest Energy Emissions Corp.) (the “Company”) entered into agreement with one of the utilities and an affiliated entity named as defendants in the patent infringement lawsuit commenced by the Company in July 2024 in the U.S. District Court in Arizona (the “Arizona Action”). Such agreement provides such parties and their affiliates with a non-exclusive license to certain Company patents related to the Company’s two-part…

Other Events. On July 30, 2024, Midwest Energy Emissions Corp. (the “Company”) issued a press release announcing that the Company has filed patent infringement lawsuits against 14 defendants, including major coal-fired power utilities, in U.S. District Courts in Arizona, Iowa, and Missouri. The lawsuits claim that the defendants knowingly violated patent rights related to the Company’s mercury emissions reduction technologies. The companies named in the Arizona filing include Tucson Electric…

CEO — Richard MacPherson: The filing discloses the execution of amended and restated employment agreements for existing executives, which is a compensatory arrangement rather than a change in personnel or a departure.

Other Events. On March 4, 2024, Midwest Energy Emissions Corp. (the “Company”) issued a press release announcing that a federal jury in the U.S. District Court for the District of Delaware awarded a $57 million patent infringement verdict in favor of the Company against the remaining group of defendants in the Company’s patent infringement lawsuit which commenced in 2019. The Company stated that the jury awarded separate amounts totaling $57 million against the group of affiliated defendants…

Entry into a Material Definitive Agreement. On February 27, 2024, Midwest Energy Emissions Corp. (the “Company”), along with its wholly-owned subsidiary, MES, Inc. (“MES”), entered into an Unsecured Debt Restructuring Agreement (the “Debt Restructuring Agreement”) with AC Midwest Energy LLC (“AC Midwest”) which replaces and supersedes the Unsecured Note Financing Agreement and Reaffirmation of Guaranty entered into with AC Midwest on February 25, 2019, as amended on October 28, 2022 (the “Uns…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Other Events. On November 14, 2023, Midwest Energy Emissions Corp. (the “Company”) filed a Current Report on Form 8-K which reported that it had entered into a confidential binding term sheet with Arthur J. Gallagher & Co., and various of its affiliated entities, and DTE Energy Resources LLC and various of its affiliates entities, to resolve the ongoing patent litigation which was initiated in July 2019 by the Company against such parties and others in the U.S. District Court for the District…

Other Events. On November 13, 2023, Midwest Energy Emissions Corp. (the “Company”) issued a press release announcing that that it has entered into a confidential binding term sheet with Arthur J. Gallagher & Co., and various of its affiliated entities (collectively “AJG”), and DTE Energy Resources LLC and various of its affiliated entities (collectively “DTE”), to resolve the ongoing patent litigation which was initiated in July 2019 by the Company against such parties and others in the U.S.…

CFO — Fiona Fitzmaurice: The filing discloses the appointment of a new external CFO, which is a standard management change rather than a departure.

CFO — Greg Powell: The CFO resigned immediately with no successor named, creating a leadership vacuum in a key financial role.

Changes in Registrant’s Certifying Accountant. On September 11, 2023, the Audit Committee of the Board of Directors (the “Audit Committee”) of Midwest Energy Emissions Corp. (the “Company”) approved the dismissal of Marcum LLP (“Marcum”) as the Company’s independent registered public accounting firm effective immediately and the engagement of Rosenberg Rich Baker Berman, P.A. (“RRBB P.A.”) as its new independent registered public accounting firm as of and for the year ended December 31, 2023.…

The filing discloses amendments to equity incentive plans to comply with exchange requirements, not a change in management or officer appointments.

Director — Troy Grant: The filing discloses the appointment of a new director to an expanded board, which is a routine governance action rather than a departure of a senior executive.

Results of Operations and Financial Condition. On April 17, 2023, Midwest Energy Emissions Corp. (the “Company”) issued a press release announcing certain unaudited financial results and other financial information of the Company for the fourth quarter and full year 2022. The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this report, including the press release furnished as Exhibits 99.1 hereto, shall…

CFO — Greg Powell: The filing discloses the appointment of an external fractional CFO, which is a new hire rather than a departure.

Entry into a Material Definitive Agreement. On January 31, 2023, Midwest Energy Emissions Corp., along with its wholly-owned subsidiary, MES, Inc. (together, the “Company”), entered into a License and Supply Agreement with Dakin Holdings Ltd., a company incorporated in Barbados (“Dakin”), effective as of January 1, 2023 (the “Dakin Agreement”), pursuant to which Dakin has granted to the Company (i) a limited license to manufacture and produce for Dakin products (the “Products”) comprising cer…

Results of Operations and Financial Condition. On January 18, 2023, Midwest Energy Emissions Corp. (the “Company”) issued via a press release a letter to shareholders from its Chief Executive Officer, Richard MacPherson, which, among other things, announced preliminary unaudited revenues of the Company for the full year ended December 31, 2022 and certain other financial information. The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by refer…