Entry into a Definitive Material Agreement On September 21, 2026, Myseum,AI, Inc. (the “Company”) entered into a Second Amendment to Sales Agreement (the “Second Amendment”) with The Benchmark Company, LLC or Benchmark, which Second Amendment amends that certain Sales Agreement dated February 10, 2025 as amended by that certain First Amendment to Sales Agreement dated February 6, 2026 (as amended, the “Sales Agreement”).to assign Benchmark’s obligations under the Sales Agreement to StoneX Fin…

Other Events. On September 21, 2026, the Company filed Amendment No. 2 to the prospectus supplement dated February 6, 2026 and filed with the Securities and Exchange Commission (the “Commission”) on February 6, 2026, as supplemented by Amendment No. 1 to the prospectus supplement dated April 23, 2026 and filed with the Commission on April 23, 2026 to reflect the Company’s entry into the Second Amendment with Benchmark reflect Benchmark’s assignment of its rights, interests, and obligations un…

The filing describes an amendment to the equity incentive plan, not a management change.

Other Events. On June 16, 2026, Myseum.AI, Inc. (the “Company”) issued a press release announcing the signing of a non-binding letter of intent with Scanon.ai Systems, Inc. (“Scanon”) to explore a collaborative development partnership focused on co-developing and integrating Scanon’s current privacy-first artificial intelligence and computer vision capabilities into the Company’s flagship Picture Party platform. A copy of the press release is furnished as Exhibit 99.1 to this Current Report o…

Other Events. On April 17, 2026, the Company issued a press release announcing that it has been accepted into the AMD AI Developer Program by Advanced Micro Devices. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. On April 23, 2026, the Company filed Amendment No. 1 to the prospectus supplement dated February 6, 2026 and filed with the Securities and Exchange Commission on February 6, 2026 for an additional $2,754,500 of shares of the Company’s com…

Chief Technology Officer — Peter Shelus: Salary increase for Chief Technology Officer, Peter Shelus.

Entry into a Material Definitive Agreement. On February 6, 2026, DatChat, Inc. (“we,” “us,” the “Company” or “MYSE”) entered into a First Amendment to Sales Agreement (the “First Amendment”) with The Benchmark Company, LLC (“Benchmark”), which First Amendment amends that certain Sales Agreement dated February 10, 2025 between the Company and Benchmark (as amended, the “Sales Agreement”). The Sales Agreement provides for the sale of shares of our common stock, par value $0.0001 per share, (the…

Other Events. On December 15, 2025, Myseum, Inc. issued a press release announcing the completion of the sale of its approximately 34% ownership interest in RPM Interactive as part of a 100% acquisition of RPM Interactive by Avalon GloboCare Corp. (Nasdaq: ALBT). A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Entry into a Material Definitive Agreement. On December 11, 2025, Myseum, Inc. (the “Company”) entered into a Debt Forgiveness and Contribution Agreement (the “Debt Forgiveness and Contribution Agreement”) with RPM Interactive, Inc., a Nevada corporation (“RPM Interactive”). Pursuant to the Debt Forgiveness and Contribution Agreement, the Company agreed to forgive and extinguish, without any payment or other consideration, an aggregate of $5,202,132 previously advanced by the Company to RPM I…

The filing describes an amendment to the equity incentive plan, not a management change.

Other Events. On April 1, 2025, DatChat, Inc. (the “Company”) issued a press release announcing its Myseum social media platform has entered into a strategic relationship agreement with The Photo Managers (TPM) for collaboration, marketing and engagement with TPM’s broad network of over 700 professional photo managers. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Entry into a Material Definitive Agreement. On February 10, 2025, DatChat, Inc. (“we,” “us,” the “Company” or “DatChat”) entered into a Sales Agreement (the “Sales Agreement”) with The Benchmark Company, LLC (“Benchmark”), to sell shares of our common stock, par value $0.0001 per share, (the “Shares”) having an aggregate sales price of up to $6,000,000, from time to time, through an “at the market offering” program under which Benchmark will act as sales agent. The sales, if any, of the Share…

Entry into a Material Definitive Agreement. On January 8, 2025, DatChat, Inc. (the “Company”) entered into a securities purchase agreement (the “Purchase Agreement”) with certain institutional investors, pursuant to which the Company agreed to sell to such investors 1,200,000 shares (the “Shares”) of common stock of the Company (the “Common Stock”), at a purchase price of $4.25 per share of Common Stock (the “Offering”). The shares of Common Stock were offered by the Company pursuant to its s…

Entry into a Material Definitive Agreement. Dragon RPM Acquisition On October 29, 2024, Dragon Interact, Inc. (“Dragon”), a majority-owned subsidiary of DatChat, Inc (the “Company”), entered into a Share Exchange Agreement (the “Agreement”) with RPM Interactive, Inc., a Florida corporation (“RPM”), pursuant to which Dragon acquired 100% of the equity interests of RPM, including all assets of RPM in consideration for the issuance of 3,500,000 restricted shares of Dragon’s common stock. RPM’s a…

Other Events. On August 29, 2024, the Company issued a press release announcing the Purchase Agreement and acquisition of the Assets. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Entry into a Material Definitive Agreement. On August 27, 2024, DatChat, Inc. (the “Company”) entered into an Asset Purchase Agreement with Judaopta LLC, a Delaware limited liability company (the “Seller”), pursuant to which it acquired from Seller (i) certain software (the “RenAI Software”), which consists of an artificial intelligence (AI) tool designed used for media library organization with the ability to tag and rename images for PC and MAC devices using AI with integration to Gemini, O…

CTO — Gabriel Daniels: The immediate removal of the Chief Technology Officer constitutes a sudden loss of a senior executive, which is a significant negative event despite the stated lack of disagreement.

Entry into a Material Definitive Agreement. On January 16, 2024, DatChat, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with EF Hutton LLC (the “Representative”), as the representative of the underwriters named therein (the “Underwriters”), relating to an underwritten public offering (the “Offering”) of 382,972 shares (the “Shares”) of the Company’s common stock, par value $0.0001 per share (“Common Stock”), and pre-funded warrants to purchase up 5…

Other Events. On January 16, 2024, DatChat, Inc. (the “Company”) issued a press release announcing its plans to spin-off its Habytat Platform Business. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. On January 16, 2024, the Company issued a shareholder letter and provided a corporate update. A copy of the shareholder letter and corporate update is attached hereto as Exhibit 99.2 and is incorporated herein by reference.

Unregistered Sales of Equity Securities. The information set forth in

Entry into a Material Definitive Agreement. On August 4, 2023, DatChat, Inc. (the “Company”) entered into a Subscription and Investment Representation Agreement (the “Subscription Agreement”) with an investor (the “Purchaser”) pursuant to which it issued and sold 2,000,000 shares (the “Shares”) of the Company’s newly designated Series B Preferred Stock, par value $0.0001 per share (the “Series B Preferred Stock”), to such Purchaser for an aggregate purchase price of $1,000. The Subscription A…

Other Events. On June 2, 2023, DatChat, Inc.(the “Company”) issued a press release providing an update on the Company’s share repurchase program. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. As previously reported by DatChat, Inc. (the “Company”) on a Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission (the “SEC”), on October 14, 2022, the Company was notified (the “Notification Letter”) by the Staff of the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) that based on the previous 30 consecutive business days,…

Changes in Registrant’s Certifying Accountant. Dismissal of Independent Registered Public Accounting Firm On April 13, 2023, the Audit Committee (the “Audit Committee”) of the Board of Directors of the Company approved the dismissal of D. Brooks and Associates CPAs, P.A. (“D. Brooks”) as the Company’s independent registered public accounting firm effective April 13, 2023. The audit reports of D. Brooks on the Company’s consolidated financial statements for each of the two most recent fiscal y…

shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing. Forward-Looking Statements The Company cautions you that statements included in this report that are not a description of historical facts are forward-looking statements. These forward-looking statements include statements regarding any liquidity concern. The inclusion of forward-looking statements should…