According to the data at Mass Shooting Tracker, widely utilized by the media, as of this writing, of the 72 mass shooters, perpetrators in shootings that killed or wounded 4 or more people, whose race is known, 21 were white, 37 were black, 8 were Latino, and 6 were members of other groups.
51% of mass shooters in 2019 were black, 29% were white, and 11% were Latino.
Three mass shooters were Asian, two were American Indian and one was Arab.
These numbers are if anything vastly understated. As many as half of the mass shootings that took place in 2019 thus far remain unsolved, but they often took place in black areas and claimed black victims.