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We investigate the complete renormalization group running of fermionobservables in two different realistic non-supersymmetric models based on thegauge group $\textrm{SO}(10)$ with intermediate symmetry breaking for bothnormal and inverted neutrino mass orderings. Contrary to results of previousworks, we find that the model with the more minimal Yukawa sector of theLagrangian fails to reproduce the measured values of observables at theelectroweak scale, whereas the model with the more extended Yukawa sector cando so if the neutrino masses have normal ordering. The difficulty in findingacceptable fits to measured data is a result of the added complexity from theeffect of an intermediate symmetry breaking as well as tension in the value ofthe leptonic mixing angle $\theta^\ell_{23}$.

Running of Fermion Observables in Non-Supersymmetric SO(10) Models