BEST SPAC I Acquisition Corp.

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year On May 19, 2026, BEST SPAC I Acquisition Corp. (the “Company”) held its extraordinary general meeting (the “EGM”), at which the shareholders voted on the proposal to amend and restate the Company’s amended and restated memorandum and articles of association to extend the date by which it has to consummate a business combination for an additional twelve (12) months from June 16, 2026 to June 16, 2027 (the “Charter Amendment Proposal”). For more information on the proposal, please refer to the definitive proxy statement filed by the Company with the Securities and Exchange Commission on April 28, 2026. The Company’s shareholders approved the Charter Amendment Proposal at the EGM. Following the shareholder approval, the Company filed the Second Amended and Restated Memorandum and Articles of Association (the “Amended Charter”), which is effective as of May 19, 2026, with the Registrar of Corporate Affairs at the British Virgin Islands, under which the Company has up to 24 months from its initial public offering (i.e., until June 16, 2027) to consummate an initial business combination. The foregoing description of the Amended Charter is not complete and is subject to and qualified in its entirety by reference to the Second Amended and Restated Memorandum and Articles of Association, a copy of which is filed with this Current Report on Form 8-K as Exhibit 3.1, and the provisions of which are incorporated by reference herein.

Item 5.07. Submission of Matters to a Vote of Security Holders. As of April 10, 2026, the record date for the EGM, there were 7,399,500 ordinary shares outstanding and entitled to vote. At the EGM, 6,169,960 ordinary shares, representing 83.38% of the total outstanding ordinary shares as of the record date, were present in person or by virtual attendance or represented by proxy, constituting a quorum for the transaction of business. Adoption of the Charter Amendment Proposal required approval by a majority of the ordinary shares present in person or by virtual attendance or represented by proxy which were present at the Extraordinary Meeting and were voted. The voting results were as follows: FOR AGAINST ABSTAIN BROKER NON-VOTE ────────────────────────────────────────────────────────────── 3,308,619 2,861,341 0 0 Redemption of Ordinary Shares In connection with the shareholders’ vote at the EGM, an aggregate of 5,333,287 ordinary shares were tendered for redemption.

Item 8.01. Other Events. On May 19, 2026, BEST SPAC I (Holdings) Corp. (the “Sponsor”) entered into an assignment of economic interest agreement with an unaffiliated third party. In exchange for such third party agreeing to vote 451,243 shares of the Company’s Class A ordinary shares sold in its initial public offering in favor of the Charter Amendment Proposal, the Sponsor agreed to transfer to such third party an aggregate of 50,000 shares of the Company’s Class B ordinary shares held by the Sponsor immediately following the release or expiration of any transfer restrictions after the consummation of an initial business combination.