Roku shares plunged 18 percent Thursday, a day after the maker of digital streaming devices provided a revenue estimate that trailed analysts' estimates.
Roku said sales in the first quarter will be $120 million to $130 million, falling short of the $131.7 million average estimate of analysts surveyed by Thomson Reuters.
Here's what Roku reported for the fourth quarter:
Investors have piled into Roku shares since the company's IPO in September, with the stock more than tripling to $51.10 as of Wednesday's close. While Roku is seeing explosive growth from its platform — the smart TV software and ads business — competition from Amazon, Google and Apple is increasing.