B physics at CMS and ATLAS

Recent results in the B-physics field achieved using proton-proton collision data at $\sqrt{s}=13$ TeV by ATLAS and CMS are presented\footnote{Copyright 2022 CERN for the benefit of the ATLAS and CMS Collaborations. Reproduction of this article or parts of it is allowed as specified in the CC-BY-4.0 license}. They include the first observation of $B^{0}\to\psi(2\mathrm{S})K^0_{\mathrm{S}}\pi^{+}\pi^{-}$ and $B^{0}_{\mathrm{s}}\to\psi(2S)K^0_{\mathrm{S}}$ decays at the CMS experiment, and the study of the $B^{+}_{\mathrm{c}}\to J/\psi D^{+}_{\mathrm{s}}$ and $B^{+}_{\mathrm{c}}\to J/\psi D^{*+}_{\mathrm{s}}$ decays at the ATLAS experiment with Run 2 data.