Nearly a majority of connected TV ads that are being bought in North America are being done through Roku, which is maintaining a commanding share of the market despite some competitors rapidly growing their business.

That’s according to analytics platform Pixalate, which determined its figures by analyzing over 70,000 programmatic-supported CTV apps, over 300 million devices and billions of CTV advertising impressions in February. It should be noted that Pixalate measured the share of ads sold, not share of spending.

Roku has a 50% market share of CTV ads in North America, equal to the share of all other providers combined, though it is down 4% year-over-year.

Samsung was closest to Roku at 21%, followed by Amazon at 13%. Amazon, however, is growing the fastest; its share of programmatic CTV ads grew by 86% year-over-year in February, and 40% month-over-month. Samsung’s share is up 10% year-over-year, and 4% from January.

Apple has 5% share of CTV ads, which is down 25% year-over-year and 34% from the previous month. The company peaked at 13% share in August, and has been slipping ever since.

LG and Vizio each had 4% market share, with Xiaomi and Microsoft at 1% and Google and MXQ under 1%.

Roku is also leading in market share in LATAM, where it had 44% of ads. In APAC, share of CTV adds is more evenly distributed, with Samsung holding 21% share, Google holding 15% and Roku holding 14%.