"It's not particularly fortuitous timing, but it is what it is. We're dealing with it right now and we're following up on that," Costolo said in an interview on CNBC's "Squawk Alley." He added that it was not "a particularly pleasant experience."
The Nasdaq acknowledged on Wednesday that shareholder.com had "inadvertently" released Twitter's results early. Figures hit Twitter's investor relations page for about 45 seconds after 3 p.m. ET on Tuesday, and financial data service Selerity sent out accurate numbers in a series of tweets. Trading in Twitter's stock was halted, and the shares were battered when they reopened minutes before the bell.