Portals into Higgs vacuum stability

We address the notorious metastability of Standard Model (SM) and promote it to a model building task: What are new ingredients required stabilize SM up Planck scale without encountering sub-Planckian Landau poles? Using extended by vectorlike fermions, we chart out corresponding landscape Higgs stability. find that gauge portal mechanism, triggered charge carriers, opens sizable room for stability in minimally invasive manner. also models with criticality Yukawa portals opening at stronger coupling. Several allow fermions TeV range, which can be searched LHC. For nontrivial flavor structure, severe flavor-changing neutral current constraints arise complement those from push lower fermion masses $\mathcal{O}({10}^{3}\text{ }\text{ }\mathrm{TeV})$.