Who are the big six in EPL?

Context: The years following 2009 marked a shift in the structure of the "Top Four" with Tottenham Hotspur and Manchester City both breaking into the top four places on a regular basis, turning the "Top Four" into the "Big Six". In the 2009–10 season, Tottenham finished fourth and became the first team to break the top four since Everton five years prior. Criticism of the gap between an elite group of "super clubs" and the majority of the Premier League has continued, nevertheless, due to their increasing ability to spend more than the other Premier League clubs. Manchester City won the title in the 2011–12 season, becoming the first club outside the "Big Four" to win since Blackburn Rovers in the 1994–95 season. That season also saw two of the "Big Four" finish outside the top four places for the first time since that season.

With only four UEFA Champions League qualifying places available in the league, greater competition for qualification now exists, albeit from a narrow base of six clubs. In the five seasons following the 2011–12 campaign, Manchester United and Liverpool both found themselves outside of the top four three times, while Chelsea finished 10th in the 2015–16 season. Arsenal finished 5th in 2016–17, ending their record run of 20 consecutive top-four finishes.

In the 2015–16 season, the top four was breached by a non-Big Six side for the first time since Everton in 2005. Leicester City were the surprise winners of the league, qualifying for the Champions League as a result.

Answer: Arsenal, Liverpool, Manchester United, Chelsea, Manchester City and Tottenham are known as the big six in the English Premier League.