Emelec successfully defended their title, winning their third consecutive championship and 13th overall.
Manta and Olmedo were relegated from the Serie A after finishing with the fewest points in the 2014 season.
They were replaced by Aucas and River Plate, the 2014 Serie B winner and runner-up, respectively.
Aucas made their 35th top-flight appearance and returned to Serie A for the first time since 2006, while River Ecuador made their debut in the top division.
The first stage began on January 31 and ended on July 12.