According to recent data released by Parks Associates, Chromecast is the second most popular streaming device. Roku, according to the data, is the most popular streaming media device manufacturer with 34 percent of the market, while Apple TV currently is the fourth most popular streaming media device based on 2014 sales, down from third place in 2013.

Parks-Associates--2014-US-Streaming-Media-Device-Sales-by-Brand-V2Apple TV’s fall from third to fourth in 2014 is largely due to the introduction of Amazon’s Fire TV and Fire TV Stick, which now hold the third place spot. Although, rumors of a refreshed Apple TV likely dampened sales somewhat too. Overall, Amazon, Apple, Roku, and Google together accounted for 86 percent of all streaming media device sales. In terms of usage, however, 20 percent of U.S. households are said to own and regularly use a streaming media device.

Roku’s offerings, of course, are the most used with 37 percent of households regularly using a Roku box. Google’s Chromecast is used regularly by 19 percent of households, while 17 percent consistently use an Apple TV. Amazon’s Fire TV and Fire TV Stick are used by 14 percent of households.

From the article "Chromecast is the second most popular streaming device, study claims" by Chance Miller.