Jennifer Elias / CNBC:

Apple's stock dropped 5% on Thursday, its worst day since April, following FTC scrutiny of Apple News and reports about delays with Siri  —  Apple just wrapped up its worst day on the stock market since April after reports surfaced about delays with Siri and as the company's news app faced regulatory scrutiny.

Jennifer Elias / CNBC:

Apple's stock dropped 5% on Thursday, its worst day since April, following FTC scrutiny of Apple News and reports about delays with Siri  —  Apple just wrapped up its worst day on the stock market since April after reports surfaced about delays with Siri and as the company's news app faced regulatory scrutiny.