The competition ran from 15 May 2015 to Finals Day at Edgbaston on 29 August.
The competition was won for the first time by Lancashire Lightning, who defeated Northamptonshire Steelbacks in the final.
The top four teams from each group qualify for the knockout stage: a three-round single-elimination tournament.
[6] This table contains the top five highest scores of the season made by a batsman in a single innings.
[8] This table lists the top five players with the best bowling figures.