According to a spokesperson for Parks Associate that Ars Technica spoke with, Vizio has 12 percent of connected TV OS market share. WSJ reported last week that Roku OS has more market share at 25 percent; although, a graph that Parks Associates' rep sent to me suggests the percentage is smaller (Parks Associates' spokesperson wouldn't confirm Roku OS' market share or the accuracy of WSJ's report to Ars). Roku OS is on Walmart's "onn." TVs, but Walmart doesn't own Roku.

From the article, "Walmart buying TV-brand Vizio for its ad-fueling customer data" by Scharon Harding