Tickets would have gone on sale for the public Saturday, April 11 at 10 a.m. PT. Pre-sale tickets went to UFC Fight Club members on Thursday and newsletter subscribers on Friday.
That's a quick sellout especially considering the more expensive than usual ticket prices of $100, $200, $300, $500, $750 and $1,000.
UFC 100 takes place July 11 at the Mandalay Bay Events Center in Las Vegas.
The event features two title bouts as well as this season's "The Ultimate Fighter" coach showdown.