S.L. Benfica 2015, Benfica reported to have 246,401 members; however, after a scheduled renumbering by the club in August 2015, the number decreased to 156,916. In April 2017, Benfica reported they had a total of 184,264 members by 31 December 2016. Benfica has rivalries with Sporting CP and FC Porto, with whom it forms the "Big Three": Portugal's most decorated clubs. None of them have been relegated from the Portuguese league since its establishment in 1934. As Lisbon-based clubs, Benfica and Sporting have shared a rivalry for over a century; it all started in 1907 when eight prominent Benfica players defected to
FC Porto for the first time. The 2006–07 Primeira Liga title was only secured in a frantic final day, as Porto finished one point above Sporting and two above Benfica. In the following season, the club achieved the "Tri" for the second time in its history – with López clinching the top goalscorer award –, but lost the Taça and Supertaça finals to Sporting CP. As result of a legal investigation on match fixing in Portuguese football, Porto was punished with the loss of six points, which did not affect its final league classification. Having claimed a sixth league and cup double