The transcription factor Foxp3 participates dominantly in the specification and function of Foxp3⁺CD4⁺ regulatory T cells (T_reg cells) but is neither strictly necessary nor sufficient to determine the characteristic T_reg cell signature. Here we used computational network inference and experimental testing to assess the contribution of other transcription factors to this. Enforced expression of Helios or Xbp1 elicited distinct signatures, but Eos, IRF4, Satb1, Lef1 and GATA-1 elicited exactly the same outcome, acting in synergy with Foxp3 to activate expression of most of the T_reg cell signature, including key transcription factors, and enhancing occupancy by Foxp3 at its genomic targets. Conversely, the T_reg cell signature was robust after inactivation of any single cofactor. A redundant genetic switch thus 'locked in' the T_reg cell phenotype, a model that would account for several aspects of T_reg cell physiology, differentiation and stability.