| Year & Name | Member parties |
1991
As Pre-Electoral Union |
|
1994 / 1997
As Democratic Left | Bulgarian Socialist Party Agrarian Union "Aleksandar Stamboliyski" Political Club "Ecopublicity" |
| 2001 / 2005 | Bulgarian Socialist Party.Party of Bulgarian Social Democrats Bulgarian Agrarian People's Union "Alexander Stamboliyski" Political Movement "Social Democrats" Communist Party of Bulgaria Movement for Social Humanism Civil Union "Roma" Green Party of Bulgaria |
| 2009 | Bulgarian Socialist Party Party of Bulgarian Social Democrats Agrarian Union "Aleksandar Stamboliyski" Communist Party of Bulgaria Movement for Social Humanism Civil Union "Roma" |
| 2013 | Bulgarian Socialist Party Party of Bulgarian Social Democrats Agrarian Union "Aleksandar Stamboliyski" Communist Party of Bulgaria Movement for Social Humanism Civil Union "Roma" New Dawn European security and integration |
2014
As BSP - Left Bulgaria | Bulgarian Socialist Party Party of Bulgarian Social Democrats Agrarian Union "Aleksandar Stamboliyski" Communist Party of Bulgaria Movement for Social Humanism Civil Union "Roma" New Dawn European security and integration Socialdemokrats United Social democracy Union of Communists in Bulgaria Ecoglasnost Party of the Bulgarian Communists |
2017
As BSP for Bulgaria | Bulgarian Socialist PartyParty of Bulgarian Social DemocratsCommunist Party of BulgariaEcoglasnostNew DawnAgrarian Union "Aleksandar Stamboliyski"Trakiya political club |
