Netflix accounts for nearly half of the internet streaming time spent by adults in the U.S., according to Nielsen data.

Netflix - 46%

Youtube - 15%

Hulu - 8%

Amazon - 4%

Other - 11%

Secure unresolved - 17%

Why it matters: Netflix's subscription growth may be slowing, but that's because its user base is pretty saturated in the U.S. Per Nielsen, Netflix is available to 51.2% of U.S. households, which is far more than its subscription rivals. (Amazon Prime is available in 28.6% of U.S. households and Hulu Plus is available in 12.7% of U.S. households.) Netflix has been able to command a sizable lead over its competitors in user engagement, surpassing Amazon by 10x and YouTube by 3x.