The GESTAR II Annual Report Year 4 presents the diligent research and development along with related publications and proposals, plus so much more, of and by GESTAR II members from October 1, 2024 to November 30, 2025. Of note, Jared Isaacman was re-nominated on November 4, 2025 to serve as NASA Administrator (and would be sworn in as such on December 18, 2025).