The tally includes $1 million that the wealthy businessman contributed to his own campaign.
In a press release Thursday, Rauner says he received more than 1,500 donations and tripled his best previous fundraising quarter. He says it's a sign he's the only candidate who can "go toe-to-toe" with Quinn in November.
The other candidates haven't released their quarterly numbers. Campaign finance disclosure reports are due to the state by Jan. 15.