  First results of a numerical investigation of primordial black hole formation
in the radiation dominated phase of the Early Universe are presented. The
simulations follow the gravitational collapse of three different families of
high-amplitude density fluctuations imposed at the time of horizon crossing.
The threshold for black hole formation, \delta_{c} \approx 0.7, is found to be
nearly identical for all perturbation families if the control parameter,
\delta, is chosen as the total excess mass within the initial horizon volume.
Furthermore, we demonstrate that the scaling of black hole mass with distance
from the formation threshold, known to occur in near-critical gravitational
collapse, applies to primordial black hole formation.
