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The detection of the stochastic gravitational wave background by NANOGravimposes constraints on the mass of compact cores of ultralight dark matter,also known as "solitons", surrounding supermassive black holes found at thecenters of large galaxies. The strong dynamical friction between the rotatingblack holes and the solitons competes with gravitational wave emission,resulting in a suppression of the characteristic strain in the nHz frequencyrange. Our findings rule out solitons arising from the condensation ofultralight dark matter particles with masses ranging from $1.3\times 10^{-21}$eV to $1.4\times 10^{-20}$ eV.

Bounds on Ultralight Dark Matter from NANOGrav