$t\overline{t}$X Production at ATLAS and CMS

Recent measurements of top quark pair production in association with W -bosons, Z-bosons and photons are reported together with a measurement of four top quark production. The measurements were performed by the ATLAS and CMS collaborations and are based on proton–proton collisions with $\sqrt{s} =$ 13 TeV and 8 TeV at the LHC. The results are compared to Standard Model (SM) theory predictions. The measurements of these rare SM processes provide tests of QCD predictions and serve as a probe for the presence of new physics at the same time.