Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing The disclosure set forth in

Unregistered Sales of Equity Securities. The disclosure set forth in

Other Events. Vendor Share Issuances On August 18, 2026, Archer Aviation Inc. (the “Company”) filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”), with the Securities and Exchange Commission (the “SEC”), relating to shares of Class A common stock, $0.0001 par value per share (“Class A common stock”) that the Company issues to certain vendors from time to time in exchange for services rendered and/or goods purchased (the “Ve…

Results of Operations and Financial Condition. On August 10, 2026, Archer Aviation Inc. (“Archer” or the “Company”) will hold a conference call regarding its operating and financial results for the second quarter ended June 30, 2026. The Company also issued a letter to its stockholders (the “Shareholder Letter”) and a press release (the “Press Release”) announcing its operating and financial results for the second quarter ended June 30, 2026. Copies of the Shareholder Letter and the Press Rel…

Entry into a Material Definitive Agreement. Equity Purchase Agreement On August 9, 2026, Archer Aviation Inc. (the “Company”) entered into a definitive Equity Purchase Agreement (the “Purchase Agreement”) with The Boeing Company (“Boeing”) to acquire all of the equity interests of Wisk Aero LLC, an autonomous aviation company, SkyGrid, LLC, a digital airspace integration and air traffic management platform, and Insitu, Inc., a manufacturer of unmanned aircraft systems and AI-enabled technolog…

of this Current Report on Form 8-K, including Exhibit 99.1, will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor will it be deemed incorporated by reference into any other filing under the Exchange Act or the Securities Act except as expressly set forth by specific reference in such a filing. Forward-looking Statements This Current Report on Form 8-K contains…

Unregistered Sales of Equity Securities. The disclosures set forth in

Other Events On May 14, 2026, Archer Aviation Inc. (the “Company”) filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act of 1933, as amended, with the Securities and Exchange Commission (the “SEC”) relating to the resale of 3,266,870 shares (the “Resale Shares”) of Class A common stock, $0.0001 par value per share (“Class A common stock”), of the Company that were issued by the Company to the selling stockholders. The Resale Shares were issued pursuant to stock purcha…

Results of Operations and Financial Condition. On May 11, 2026, Archer Aviation Inc. (“Archer” or the “Company”) will hold a conference call regarding its operating and financial results for the first quarter ended March 31, 2026. The Company also issued a letter to its stockholders (the “Shareholder Letter”) and a press release (the “Press Release”) announcing its operating and financial results for the first quarter ended March 31, 2026. Copies of the Shareholder Letter and the Press Releas…

Chief Administrative Officer — Tosha Perkins: Tosha Perkins is transitioning from Chief Administrative Officer to a senior advisor role.

Regulation FD Disclosure. On March 9, 2026, Archer Aviation Inc. (the “Company”) filed a counterclaim and answer in its ongoing federal court litigation with Joby Aero, Inc. and Joby Aviation, Inc. (together, “Joby”) before the United States District Court for the Northern District of California. In its counterclaim, the Company asserts various claims against Joby, including for unfair competition and false advertising. The Company is seeking damages, declaratory relief, and certain other rem…

Other Events On March 5, 2026, Archer Aviation Inc. (the “Company”) filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act of 1933, as amended, with the Securities and Exchange Commission (the “SEC”) relating to the resale of 5,325,440 shares (the “Resale Shares”) of Class A common stock, $0.0001 par value per share (“Class A common stock”), of the Company that were issued by the Company to the selling stockholders. The Resale Shares were issued pursuant to stock purch…

Results of Operations and Financial Condition. On March 2, 2026, Archer Aviation Inc. (“Archer” or the “Company”) will hold a conference call regarding its operational and financial results for the fourth quarter and full year ended December 31, 2025. Archer also issued a letter to its stockholders (the “Shareholder Letter”) and a press release (the “Press Release”) announcing its operational and financial results for the fourth quarter and full year ended December 31, 2025. Copies of the Sha…

Regulation FD Disclosure. On February 23, 2026, Archer Aviation Inc. (“Archer”) filed a patent infringement lawsuit against Vertical Aerospace Ltd. and Vertical Aerospace Group Ltd. (collectively, “Vertical”) in the United States District Court for the Eastern District of Texas. The lawsuit alleges that Vertical’s electric vertical take-off and landing (“eVTOL”) Valo aircraft infringes multiple patents owned by Archer relating to its Midnight eVTOL aircraft. Archer seeks, among other things,…

Other Events On January 23, 2026, Archer Aviation Inc. (the “Company”) filed a motion to dismiss the complaint filed by Joby Aero, Inc. against the Company, as previously disclosed on November 21, 2025. No hearing on the motion has been scheduled at this time. The Company intends to continue to vigorously defend this matter. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned he…

Other Events On January 22, 2026, the Company filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act with the Securities and Exchange Commission (the “SEC”) relating to the resale of 341,984 shares of Class A common stock, $0.0001 par value per share that were issued by the Company to the selling stockholders pursuant to stock purchase agreements dated January 17, 2026, in connection with the Company’s contemporaneous acquisition of a business owned by the selling stoc…

Other Events Hawthorne Airport Acquisition Initial Closing On December 8, 2025, the Company completed the previously announced acquisition of certain real estate assets giving it control of Hawthorne airport. A copy of the press release announcing the closing is attached hereto as Exhibit 99.1. The information in this Item 7.01, including Exhibit 99.1, is furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”…

Other Events On December 10, 2025, the Company filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act with the Securities and Exchange Commission (the “SEC”) relating to the resale of 1,174,453 shares of Class A common stock, $0.0001 par value per share that were issued by the Company to the selling stockholder. The shares were issued pursuant to an Asset Purchase Agreement, dated November 18, 2025, by and among the parties named therein relating to the acquisition of…

Other Events. On November 26, 2025, Archer Aviation Inc. (the “Company”) filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act of 1933, as amended, with the Securities and Exchange Commission (the “SEC”) relating to the issuance of 1,517,618 shares of Class A common stock, $0.0001 par value per share (“Class A common stock”), of the Company. The shares were issued pursuant to a license agreement with certain licensing parties (together, the “Licensor”), dated November…

Other Events. On November 19, 2025, Archer Aviation Inc. (the “Company”) filed a prospectus supplement pursuant to Rule 424(b) under the Securities Act of 1933, as amended, with the Securities and Exchange Commission (the “SEC”) relating to the resale of 1,095,321 shares of Class A common stock, $0.0001 par value per share (“Class A common stock”), of the Company that were issued by the Company to the selling stockholder. The shares were issued pursuant to a Stock Retainer Agreement and relat…

Entry into a Material Definitive Agreement. Acquisition of Hawthorne Airport On November 5, 2025, the Company, through its wholly-owned subsidiaries, entered into a series of definitive agreements (the “Hawthorne Airport Acquisition Agreements”) with Hawthorne Airport, LLC (“HAL”), 395 Park Place, LLC (“395”) and Advanced Air, LLC (“Advanced Air”, and collectively with HAL and 395, referred herein collectively as the “Sellers”), pursuant to which the Company would acquire: (i) the master leas…

Entry into a Material Definitive Agreement. Registered Direct Offering On November 6, 2025, Archer Aviation Inc. (the “Co mpany”) entered into securities purchase agreements (the “Purchase Agreements”) with certain institutional investors (the “Purchasers”), pursuant to which the Company agreed to issue and sell, and the Purchasers agreed to purchase, 81,250,000 shares (the “Shares”) of the Company’s Class A common stock in a registered direct offering (the “Registered Offering”) at a price o…

Results of Operations and Financial Condition. On November 6, 2025, the Company will hold a conference call regarding its operational and financial results for the third quarter ended September 30, 2025. The Company also issued a letter to its stockholders (the “Shareholder Letter”) and a press release (the “Press Release”) announcing its operational and financial results for the third quarter ended September 30, 2025. Copies of the Shareholder Letter and the Press Release are furnished herew…

Other Events. On October 15, 2025, Archer Aviation Inc. (the “Company”) announced that it won a competitive bid process to acquire certain patent assets of Lilium GmbH, for a total purchase price of 18 million euros (the “Patent Acquisition”). The Patent Acquisition, which is expected to close in the fourth quarter of the Company's fiscal year ending December 31, 2025, is subject to customary closing conditions. A copy of the Company’s press release announcing the Patent Acquisition is attach…

Results of Operations and Financial Condition. On August 11, 2025, Archer Aviation Inc. (“Archer” or the “Company”) will hold a conference call regarding its operational and financial results for the second quarter ended June 30, 2025. Archer also issued a letter to its stockholders (the “Shareholder Letter”) and a press release (the “Press Release”) announcing its operational and financial results for the second quarter ended June 30, 2025. Copies of the Shareholder Letter and the Press Rele…