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It is shown that the large $N_c$ limit of QCD with quarks in the two-indexantisymmetric color representation [QCD(AS)] has narrow tetraquark states withexotic flavor quantum numbers. They decay into mesons with a width that isparametrically $O(1/N_c^2)$. Tetraquarks with non-exotic quantum numbers mix atleading order with mesons of the same overall quantum numbers. QCD(AS) at$N_c=3$ corresponds to ordinary QCD; its large $N_c$ limit represents analternative starting point for a $1/N_c$ expansion to the standard one withquarks in the fundamental color representation.

Quantum-Number Exotic Tetraquarks at Large $N_c$ in QCD(AS)