Black hole to stellar mass ratio as a function of redshift for our sample of radio sources (filled red dots) and for the galaxies in our comparison sample (open symbols). The dashed black lines correspond to the evolutionary model described by McLure et al. (2006), along with the associated 1σ uncertainty. The color-coding is reported in the legend in the bottom right corner. The error bars to the left of the legend show the typical ∼0.5 dex uncertainty in log(M_BH/M_⋆).