After rising 5.7% on Wednesday, Salesforce dropped by roughly the same amount after hours following its third-quarter earnings report. Salesforce raised profit guidance for the rest of the year. But it set a fourth-quarter revenue forecast in a range mostly below Wall Street analysts' consensus estimate. Meanwhile, co-chief executive officer and vice chair Bret Taylor announced his resignation, effective Jan. 31. Marc Benioff will remain chair and chief executive of the company. Shares of the business-software firm were down 37% this year as of the close.