Shares of DraftKings closed down 28% on Friday after the sports betting company reported slower monthly customer growth in the third quarter that fell short of estimates.

For the quarter ended Sept. 30, DraftKings said its monthly unique paying customers increased to 1.6 million, up about 22% from 1.3 million a year ago.

That was short of the 2 million that analysts projected, according to StreetAccount, and slower than in the previous two quarters.