Harding made his Premiership debut against London Irish in March 2021.[3] By October 2023, Harding had made 52 appearances for the Bears since signing in 2020.[4] He was named club captain for the upcoming Premiership season, taking over from Steven Luatua.[3]
In December 2024, he captained the side during their 0–38 home loss to Sale Sharks, their worst home defeat for eight years and the first time since September 2016 that they had not scored a point in a Premiership fixture.[5]