World Rankings 2025(as of Sep 1st) Women's 400m Individual Medley 1. 🇨🇦Summer McIntosh 4:23.65 2. 🇦🇺Jenna Forrester 4:33.26 2. 🇯🇵Mio Narita 4:33.26 4. 🇨🇳Yu Zidi 4:33.76 5. 🇺🇸Emma Weyant 4:33.95 6. 🇦🇷Agostina Hein 4:34.34 7. 🇮🇪Ellen Walshe 4:35.32 8. 🇬🇧Amalie Smith 4:35.49