  These proceedings present the observation of the 4-top production process and
the latest results of the production of top-quark pairs associated with W and
$\gamma$ bosons ($t\bar{t}W$ and $t\bar{t}\gamma$) and b jets
($t\bar{t}b\bar{b}$) at a collision energy of 13 TeV carried out by the CMS and
ATLAS Collaborations.
