ATLAS results on charmonium and B meson production and decays

Recent results from the proton-proton collision data taken by the ATLAS experiment on the charmonium and B meson production and decays will be presented. The measurement of J/ψ and ψ(2S) differential cross sections will be reported as measured on the whole Run 2 dataset. The measurement of the differential cross sections of B+ production at 13 TeV and their ratios to those measured at 7 TeV will be discussed. The measurement of the differential ratios of B+c and B+ production cross sections at 8 TeV will be shown. New results on the Bc decays to J/ψ D(∗)s final states obtained with the Run 2 data at 13 TeV will also be reported