Founded in 1998 as Club Deportivo Berio Futbol Taldea, in 2016 the team was integrated fully into the structure of Real Sociedad, becoming its second reserve squad. In the previous two seasons, after gaining promotion to the Tercera División, Berio operated as a farm team for Real Sociedad but still played at their own stadium wearing their traditional green kit.[1] From then on, they would play at Zubieta and wear Real Sociedad blue-and-white colours.
In general, the Real C squad will be graduates from the club's youth system aged between 17 and 20, and successful players will move up to Real Sociedad B (Sanse) after one or two seasons. The Real Sociedad C team must play at least one division below Sanse, who must themselves play one division lower than the main Real Sociedad club. Neither reserve team can enter the Copa del Rey.
^"Real Sociedad y Berio FT se fusion an" [Real Sociedad and Berio FT merge]. Official Website (archive version). Real Sociedad. 21 July 2016. Archived from the original on 14 August 2016. Retrieved 29 October 2019.
