  We argue that given the experimental constraints on the Higgs mass the least
fine tuned parameter space of minimal supersymmetric standard model is with
negative stop masses squared at the grand unification scale. While stop mass
squared is typically driven to positive values at the weak scale, the
contribution to the Higgs mass squared parameter from the running can be
arbitrarily small, which reduces fine tuning of electroweak symmetry breaking.
At the same time the stop mixing is necessarily enhanced and the maximal mixing
scenario for the Higgs mass can be generated radiatively even when starting
with negligible mixing at the unification scale. This highly alleviates
constraints on possible models for supersymmetry breaking in which fine tuning
is absent.
