American Bitcoin Corp.

Item 3.03 Material Modification to Rights of Security Holders. The information contained in Item 5.03 below is incorporated by reference into this Item 3.03.

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On July 2, 2026, American Bitcoin Corp. (the "Company") filed an amendment (the "Amendment") to its Second Amended and Restated Certificate of Incorporation, as Amended (the "Charter"), with the Secretary of State of the State of Delaware to effect a reverse stock split at a ratio of 1-for-15 (the "Reverse Stock Split") of the Company's outstanding shares of common stock. The Amendment became effective on July 2, 2026. As previously disclosed, at its annual meeting of stockholders held on June 22, 2026 (the "Annual Meeting"), the Company's stockholders approved a proposal to authorize the Company's board of directors (the "Board") to amend the Charter to effect a reverse stock split at a ratio within a range of 1-for-5 and 1-for-40 (or any number in between), as determined by the Board in its discretion. Following the completion of the Annual Meeting, on June 22, 2026, the Board approved the Reverse Stock Split at a ratio of 1-for-15. On July 6, 2026, the Company’s Class A common stock began trading under the existing symbol “ABTC” on a reverse split-adjusted basis under a new CUSIP number, 02462A 203. The Reverse Stock Split will affect all stockholders uniformly and will not alter any stockholder's percentage ownership interest or proportionate voting power in the Company's equity, except for de minimis changes as a result of the elimination of fractional shares. No fractional shares will be issued in connection with the Reverse Stock Split. Stockholders who would otherwise be entitled to a fractional share of any class of the Company’s common stock are instead entitled to a cash payment from the Company’s transfer agent in an amount equal to their respective pro rata shares of the total proceeds of that sale net of any brokerage costs incurred by the transfer agent to sell such stock. The Reverse Stock Split will reduce the number of shares issued from 1,092,295,800 shares, comprising 360,070,897 shares of Class A common stock, 732,224,903 shares of Class B common stock, and no shares of Class C common stock, to approximately 73 million shares, comprising approximately 24 million shares of Class A common stock, approximately 49 million shares of Class B common stock, and no shares of Class C common stock, subject to adjustment for fractional shares. The authorized number of shares and par value of each class of the Company’s common stock will not be reduced. In addition, proportionate adjustments will be made to (i) the number of shares of common stock available for issuance and the number of shares of common stock issuable upon the vesting and settlement of existing equity grants under the Company’s equity compensation plan and (ii) the number of shares of the Company’s Class A common stock purchasable upon exercise of outstanding warrants and, for certain of the Company’s outstanding warrants, their exercise price per share, in each case in accordance with the terms of the relevant warrant agreement. The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by the full text of the Amendment, a copy of which is filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 8.01 Other Events. On July 1, 2026, the Company issued a press release announcing the effective date of the Reverse Stock Split. A copy of the press release is filed as Exhibit 99.1 and is incorporated by reference into this Item 8.01.