UFC 199: Rockhold vs. Bisping 2 was a mixed martial arts event held on June 4, 2016, at The Forum in Inglewood, California.

[4] The pairing first met at featherweight on WEC 26 in 2007, where Faber defeated Cruz via guillotine choke to defend his title.

Penn announced his intention to return to active competition in the featherweight division after an 18-month "retirement" and was expected to compete at UFC 197.

[17] After the UFC concluded that no criminal or civil charges would be filed, the organization announced that he would face Dennis Siver at this event.

[21] Subsequently, Penn himself was removed from the card on May 23 after he was flagged for a potential anti-doping violation: the use of an IV in excess of 50 ml in a six-hour period during a March 25 out-of-competition sample collection.

This is part of new measures for fighters' safety, with the CSAC creating new rules that will eventually be adapted to all the other athletic commissions.