On September 1, 2026, American Exceptionalism Acquisition Corp. A announced the appointment of Michael Teng to its board of directors, effective immediately. In conjunction with this appointment, the board designated Mr. Teng to serve on the audit committee.

The filing indicates that the board has determined Mr. Teng to be an independent director in accordance with Securities and Exchange Commission and New York Stock Exchange listing standards.

As part of his new role, Mr. Teng entered into a joinder agreement to the Letter Agreement dated September 25, 2025, which was previously filed as an exhibit. He also executed a joinder to the Registration Rights Agreement dated September 25, 2025, and a standard director indemnification agreement.

The Company agreed to reimburse Mr. Teng for reasonable out-of-pocket expenses related to his directorial duties. Additionally, the Sponsor transferred 150,000 Class B shares to Mr. Teng on the date of the appointment.

The filing confirms that Mr. Teng is not party to any other arrangements or understandings regarding his appointment and is not involved in any other transactions with the Company that require disclosure under Item 404(a) of Regulation S-K.