Kyle Diamantas leads the market at 43% as the current acting FDA commissioner following Marty Makary’s May 2026 resignation, with reports highlighting his effective management of food policy priorities and growing internal support despite limited prior public health experience. Sara Brenner at 17% reflects her earlier acting commissioner role and deputy experience before shifting to HHS. Brett Giroir, Grace Graham, and Stephen Hahn trail as speculative alternatives amid the administration’s search for a permanent nominee aligned with drug approval reforms and food safety goals. The 12% probability of no announcement by December 31 accounts for Senate confirmation timelines and the deliberate pace of identifying candidates who can rebuild agency trust under HHS oversight.