Exhibit 99.1

Joint Filing Agreement

The undersigned hereby agree that the Statement on Schedule 13G dated May 29, 2026 with respect to the Class A Ordinary Shares, par value $0.0001 per share, of Research Alliance Corporation III, a company organized under the laws of the Cayman Islands, and any further amendments thereto executed by each and any of the undersigned shall be filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended.