Material Agreement (Form 8-K)

Item 1.01 Entry into a Material Definitive Agreement.

On September 30, 2025, StoneBridge Acquisition II Corporation, a Cayman Islands exempted company (the "Company"), entered into an Administrative Services Agreement (the "Agreement"), with Scieniti LLC ("Scieniti), an affiliate of the Company's sponsor, Stonebridge Acquisition Sponsor II LLC, pursuant to which the Company agreed to pay Scieniti a total of $10,000 per month for office space, utilities and secretarial and administrative support. On August 10, 2026, the Company and Scieniti entered into a waiver to the Agreement (the "Waiver") whereby Scieniti agreed to irrevocable waive its right to such monthly fees for all periods commencing on and after October 1, 2025, through and including the earlier of the consummation of the Company's initial business combination and the Company's liquidation.

The foregoing description of the Waiver is only a summary and is qualified in its entirety by reference to the full text of the Waiver, which is attached hereto as Exhibit 10.1, and incorporated by reference herein.