XYZ states at LHCb

The latest years have observed a resurrection of interest in searches for exotic states motivated by precision spectroscopy studies of beauty and charm hadrons providing the observation of several exotic states. The latest results on spectroscopy of exotic hadrons are reviewed, using the proton-proton collision data collected by the LHCb experiment. The document focuses among others on the confirmation of the resonant nature of the Z(4430) mesonic state and observation of $J/\Psi \phi$ structures consistent with exotic states. LHCb has also made significant contributions to the determination of the quantum num- bers of the X(3872) state and excluded the existence of the X(5568) tetraquark candidate.