Rich K.O. first burst onto the music scene in late 2012 when he featured on Sacramento rapper Hollow Tip's Block Exchange & Block Royalty albums. After studying the industry under his brother, Sacramento artist Mic-C, he teamed up with his brother for the Round 1 mixtape, which he followed with his solo mixtape Round 2. In December 2013 Rich K.O. started with the help of his Mic-C started Trigga Mob Entertainment or T.M.E., and released the labels first album Mic-C Rudeboii Mobsta!