Maker Studios.
A production company focusing on online and youtube entertainment. A lot of Youtube channels are signed to them, among them rap battles. Sadly they seem to partake in pretty shoddy business practices, their CEO even being a convicted felon. They apparently strong arm youtubers to sign over full rights to their products to the studio and other things, which is why Ray William Johnson (their most famous name arguably) left the studio recently. They are now trying to force =3 from Johnson and other stuff and has the youtube community in revolt.
More can be read
here