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We describe a heavy and exotic tetraquark state as a holographic molecule, bybinding the lightest heavy-light meson $(0^-, 1^-)$ multiplet to a flavoredsphaleron, in the bulk of the Witten-Sakai-Sugimoto model. Bound tetraquarkstates emerge as Efimov states in the heavy quark limit, with a binding energyfor charm tetraquark comparable to the $T_{cc}^+$ recently reported by theLHCb, but a substantially smaller width, for a large but finite $^\prime$tHooft coupling. Fixing the parameters of the model at the empirical mass of$T_{cc}^+$ allows us to predict the bindings of the undiscovered so farbottom-charm and bottom tetraquarks, when interpreted as Efimov states.

Holographic tetraquarks and the newly observed $T_{cc}^{+}$ at LHCb