Amazon doesn't publicly disclose how many Amazon Prime members it is the U.S., or globally for that matter. But late last year, research company Parks Associates published data suggesting that Prime Video has surpassed Netflix in U.S. subscriber count.

From the article, "Amazon Touts JustWatch Report Saying It Beat Netflix in Q2 Engagement ... 'Take Our Market Share Data With a Grain of Salt,' Responds JustWatch's Founder" by Daniel Frankel.
But analysts estimate that Sling has racked up fewer than 1 million subscribers since it launched in February 2015. Vue’s numbers are harder to get a handle on, but it’s not on the list of top 10 most...
But it's not the only game in town. Amazon's Fire TV Stick is a very capable competitor, and it has been rapidly gaining ground. According to Parks Associates, Roku commanded 36% of U.S. market share...
Roku (NASDAQ:ROKU) and Amazon (NASDAQ:AMZN) controlled 69% of the US streaming device market in the first quarter of 2019, according to Parks Associates. Between the first quarters of 2017 and 2019, R...
“There seemed to be an attitude around the industry that after House of Cards and Orange is the New Black, there was no way Netflix could catch lightning in a bottle again,” says Glenn Hower, a senior...