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
1981–82 S.L. Benfica season 4–1 loss, now for Supertaça Cândido de Oliveira with Porto and lost the trophy. On 17 January, Benfica lost in Bessa with Boavista, finishing the first half of the league with 21 points, four behind leaders Sporting. A week later, Benfica beat Porto at home by 3–1, only to close the month with an away draw with Portimonense. The gap was now at five points. In February, another loss, 1–0 with Vitória de Guimarães, with Sporting increasing their lead to seven points. In the opening match-day of March, Benfica drops more points in an away draw with Estoril Praia, but