Thanongsak Simsri is Champion with the IBF at Light Flyweight after moving up from Minimumweight.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Light Flyweight | December 2019 | July 2026 | 6 years 8 months |
| Minimumweight | December 2024 | January 2025 | 2 months |
Time ranked counts distinct months this fighter appears on a rankings list for that division. If they drop out and return later, months off the ranking lists are not included.