Shares of MBX Biosciences Inc. hit a 52-week high on preliminary phase I data for its MBX-4291, a GLP-1/GIP co-agonist prodrug for obesity. Though early and still blinded, findings from the trial showed promising efficacy, along with good tolerability and the potential for once-monthly dosing, factors that will likely be critical for MBX to compete in the crowded obesity space.