Europa League

In 2008, it was decided that UEFA Cup would change the name to UEFA Europe League for the coming next season. The competition change format from knockout matches to a group play in the first phase that would be succeeded by a knock-out stage. Another novelty was that the teams that was third-place in the first phase of UEFA Champions League group play would be participating in that knock-out stage.

Winners and runners-up

All the winners and runners-up so far trough the years of the Europa League.

Season Winner Runner-up
2017-2018 Atlético Madrid Marseille
2016-2017 Manchester United Ajax
2015-2016 Sevilla Liverpool
2014-2015 Sevilla Dnipro Dnipropetrovsk
2013-2014 Sevilla Benfica
2012-2013 Chelsea Benfica
2011-2012 Athlético Madrid Athletic Bilbao
2010-2011 Porto Braga
2009-2010 Athlético Madrid Fulham

The first Europa League tournament was played in the season 2009-2010. Before 2009 the tournament was called UEFA CUP, continue to UEFA Cup winners and runners-up.

History

The Europa League is a rather young competition and the legacy can't compete with other big European Cups. The most successful club so far is Sevilla with remarkable results, collecting three trophies.

Statistics

As mentioned above, Sevilla has so far excelled themself in the competition. If all competitions, with both UEFA Cup and Europa League aggregated, Sevilla would have five titles, two more than any other time.

The table below is a comparison by clubs in UEFA Europa League with UEFA Cup editions excluded.

Table 2. Clubs and Europa League titles
Club Titles
Sevilla 5
Atlético Madrid 3
Porto 1
Chelsea 1
Manchester United 1

Benfica is so far the only time that have been the runners-up twice.

UEFA Europa League timeline

1971 UEFA Cup, the predecessor of UEFA Europe League, is established.
2009 The competition is established.
2012 Atlético Madrid become the first club to win the tournament twice (2010 and 2012).
2016 Sevilla become the first club to win the tournament trice and also by consecutive victories (2014, 2015 and 2016).

References:
https://en.wikipedia.org/wiki/List_of_UEFA_Cup_and_Europa_League_finals