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We revisit the possibility of a Dirac fermion dark matter candidate in thelight of current $b \to s \ell^+ \ell^-$ anomalies by investigating a minimalextension of the Standard Model with a horizontal $\mathrm{U(1)}^{\prime}$local symmetry. Dark matter stability is protected by a remnant $\mathcal{Z}_2$symmetry arising after spontaneous symmetry breaking of$\mathrm{U(1)}^{\prime}$. The associated $Z^{\prime}$ gauge boson canaccommodate current hints of new physics in $b \to s \ell^+ \ell^-$ decays, andacts as a vector portal between dark matter and the visible sector. We findthat the model is severely constrained by a combination of precisionmeasurements at flavour factories, LHC searches for dilepton resonances, aswell as direct and indirect dark matter searches. Despite this, viable regionsof the parameter space accommodating the observed dark matter relic abundanceand the $b \to s \ell^+ \ell^-$ anomalies still persist for dark matter and$Z^{\prime}$ masses in the TeV range.

Dirac dark matter and $b \to s \ell^+ \ell^-$ with $\mathrm{U(1)}$ gauge symmetry