Athletic Bilbao is one of three founding members of the Primera División that have never been relegated from the top division since its inception in 1929, the others being Real Madrid and Barcelona. Athletic have won La Liga on eight occasions, fourth most in the history of the league. In the table of Copa del Rey titles, Athletic is second only to Barcelona, having won it 23 times. The club also has one of the most successful women’s teams in Spain, which has won five championships in the Primera División Femenina.Athletic’s main rivals are Real Sociedad, against whom it contests the Basque derby, and Real Madrid, due to sporting and political rivalry. At various points in the club’s history, further Basque league derbies have been contested against Alavés, Eibar and Osasuna. Athletic is one of only four professional clubs in Spain (the others being Osasuna, Real Madrid and Barcelona) that is not a sports corporation; it is owned and operated by its club members.