Exotic states at the LHC

Using the Run-I data delivered by the LHC, several exotic states are observed or searched for. The most recent LHCb results are reported, including the search for the B 0 s π ± state, the observa- tion of four J / ψ φ structures in B + → J / ψ φ K + decays, and the observation of J / ψ p resonances consistent with pentaquark states in Λ 0 b → J / ψ pK − decays. The results on J / ψ φ from the CMS collaboration are also discussed.