Yes,but most of the black slaveholders were men who were offspring of white slaveholders and slave women.This mulatto elite identified more with their fathers than their mother's people.
I've been sleuthing around the net to find some of the earlier posts that I have seen here on FR.
IIRC the early black slave holders were from Africa. Not sure about the later ones.
Is much known about the black slave owners? Surely folks here on FR would know.