If Ayutthaya United FC is the 2026 Thai League 1 champion, then the market resolves to Yes. The Thai League 1 champion is the team that finishes with the most points in the league standings at the end of the regular season. All teams compete in a double round-robin league format, and the team with the highest total points after all matches have been played is declared the Thai League 1 champion. This market will close and expire after a title holder is declared.