Higgs vacuum stability has important consequences for cosmology.
In particular, we argue that if the Higgs vacuum is metastable, then the dark
matter cannot contain a single black hole of mass less than $10^{15}{\rm g}$
in our entire past light cone. In addition to being the destroyer microscopic black holes,
it may be possible that Higgs vacuum decay is a source of
primordial black holes during inflation.