  Complex scalars in U(1)-symmetric potentials can form stable Q-balls,
non-topological solitons that correspond to spherical bound-state solutions. If
the U(1) charge of the Q-ball is large enough, it can support a tower of
unstable radial excitations with increasing energy. Previous analyses of these
radial excitations were confined to fixed parameters, leading to excited states
with different charges $Q$. In this work, we provide the first characterization
of the radial excitations of solitons for fixed charge, providing the physical
spectrum for such objects. We also show how to approximately describe these
excited states analytically and predict their global properties such as radius,
energy, and charge. This enables a complete characterization of the radial
spectrum. We also comment on the decay channels of these excited states.
