Interim featherweight champion Conor McGregor’s biography states that UFC 189 reached 1 million PPV buys.
According to Conor McGregor's updated biography on UFC.com, it appears that the UFC 189 PPV event, which he headlined, brought in 1 million Pay-Per-View buys.
The biography (h/t MMAJunkie) stated that "the fight attracted a record 16,019 fans to the MGM Grand Garden Arena, plus a $7.2-million live gate and 1 million pay per view buys, proving McGregor's sizeable drawing power. Some 3,000 Irish fans converged on Las Vegas and left deliriously happy."
This figure would coincide with UFC President Dana White's confident statement ahead of the event on International Fight Week, as he claimed that UFC 189 was trending towards a seven-figure buy rate.