  We investigate simple extensions of the Standard Model that could lead to the
negative values of the top Yukawa coupling still allowed by the ATLAS Higgs
results. Integrating out tree-level new physics generates dimension six
operators that can lead to large changes to the top Yukawa couplings. If the
top Yukawa coupling is negative, there is new physics beneath the TeV scale. We
illustrate the simplest models still allowed by current searches.
