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We argue that given the experimental constraints on the Higgs mass the leastfine tuned parameter space of minimal supersymmetric standard model is withnegative stop masses squared at the grand unification scale. While stop masssquared is typically driven to positive values at the weak scale, thecontribution to the Higgs mass squared parameter from the running can bearbitrarily small, which reduces fine tuning of electroweak symmetry breaking.At the same time the stop mixing is necessarily enhanced and the maximal mixingscenario for the Higgs mass can be generated radiatively even when startingwith negligible mixing at the unification scale. This highly alleviatesconstraints on possible models for supersymmetry breaking in which fine tuningis absent.Comment: 5pages, 1 color figur

Radiatively Generated Maximal Mixing Scenario for the Higgs Boson Mass and the Least Fine-Tuned Minimal Supersymmetric Standard Model