Newbury Street II Acquisition Corp

Item 8.01 Other Events. On September 28, 2026, Newbury Street II Acquisition Corp (the “ Company ”) announced that an extraordinary general meeting in lieu of an annual general meeting of shareholders (the “ EGM ”) will be held at the office of Ellenoff Grossman & Schole LLP at 1345 Avenue of the Americas, 11 th Floor, New York, New York 10105. The date and time of the Meeting will be as set forth in the Company’s definitive proxy statement for the EGM to be filed with the U.S. Securities and Exchange Commission (the “ SEC ”). Pursuant to the Company’s amended and restated memorandum and articles of association currently in effect, and as amended (the “ Amended and Restated Articles ”), shareholders seeking to bring business before the EGM must deliver such proposals to the Company at: Newbury Street II Acquisition Corp, c/o Thomas Bushey, 121 High Street, Floor 3, Boston, MA 02110, no later than October 8, 2026. Any shareholder proposal must also comply with the requirements of the law of the Cayman Islands, the rules and regulations promulgated by the SEC and the Amended and Restated Articles. Under the Amended and Restated Articles and the law of the Cayman Islands, no business other than as set forth in the Company’s definitive proxy statement for the EGM to be filed with the SEC may be transacted at the EGM. The EGM is to be held, in part, to satisfy the annual meeting requirement pursuant to Listing Rule 5620(a) (the “ Rule ”) of The Nasdaq Stock Market LLC. Pursuant to the Rule, the Company is required to hold its first annual meeting of shareholders on or prior to December 31, 2026. Because the EGM does not technically constitute an “annual general meeting” under Cayman Islands law, the terms of the Company’s Class I directors will not expire at the Special Meeting.