More can always be said, but check this answer from /u/sowser
https://www.reddit.com/r/AskHistorians/comments/47b4ha/ive_heard_people_mention_that_black_people_owned/d0bs2zk/
and this one from /u/freedmenspatrol
https://www.reddit.com/r/AskHistorians/comments/90902h/how_prevalent_were_black_slave_owners_in_america/