  The newest results from the ATLAS Collaboration for the production of a
top-quark pair in association with a $Z$ or $W$ boson, and for the production
of four top quarks, are summarised in these proceedings. The measurements were
performed with 36.1 fb$^{-1}$ of proton-proton collision data from the Large
Hadron Collider at a centre-of-mass energy of 13 TeV.
