Answer
Finn Bálor's NXT Championship reign was the longest in the history of the title. Bálor won the title at NXT TakeOver: Brooklyn on August 22, 2015, defeating Kevin Owens. He would go on to defend the title against a number of opponents, including Owens, Samoa Joe, Shinsuke Nakamura, and Samoa Joe again. Bálor would finally lose the title to Nakamura at NXT TakeOver: The End on June 8, 2016.