Rare decays, radiative decays and $b → s \ell^+ \ell^−$ transitions at LHCb

Rare flavour-changing neutral-decays are heavily suppressed within the Standard Model of particle physics. As such, measurements of the properties of these decays are sensitive to the contribution from new particles. A number of tensions have been observed in $b → s \ell^+ \ell^−$ processes with respect to the SM. A summary of recent measurements of leptonic, radiative and rare semileptonic processes by the LHCb collaboration is presented