The masses of the ground-state and excited heavy tetraquarks with hidden charm and bottom are calculated within the relativistic diquark—antidiquark picture. The dynamics of the light quark in a heavy—light diquark is treated completely relativistically. The diquark structure is taken into account by calculating the diquark—gluon form factor. New experimental data on charmonium-like states above the open charm threshold are discussed. The obtained results indicate that X(3872), Y(4260), Y(4360), Z(4433), and Y(4660) can be tetraquark states with hidden charm.
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