Results from ATLAS studies on heavy flavor spectroscopy are presented.
The results of the analyses on four-muons final states in $pp$ collisions are presented
at the different LHC energies $\sqrt{s}=8\,$TeV and $\sqrt{s}=13\,$TeV, and in particular in the channels $\left(\Upsilon(\to \mu^+\mu^-)+\mu^+\mu^-\right)$ and
di-charmonium (di-$J/\Psi$ and $J/\Psi+\Psi_{2S}$) decaying to muon pairs.