[3] Camille Reboul presided over the group from its foundation, and was later succeeded in this position by André Morizet.

[7] During the Fourth Republic, a socialist group was formed in the Council of the Republic, with 64 seats following senatorial elections on 8 December 1946,[8] and 62 seats following senatorial elections on 7 November 1948,[9] doing better than its tripartite partners as a result of its good local implantation.

[19] After Estier decided not to represent himself in the 2004 renewal,[20] he was succeeded by Jean-Pierre Bel, elected by the socialists in a four-way contest on 28 September.

[26] After Rebsamen was appointed to the government, he left his seat in the Senate on 14 April 2014,[27] and was succeeded by Didier Guillaume the following day.

[31] On 27 June 2017, 23 socialists left for the La République En Marche group on the day of its foundation.