Should Walmart's Purchase of Vizio Worry Roku Stock Investors?

Retail giant Walmart (WMT 0.98%) just announced it will purchase smart TV maker Vizio (NYSE: VZIO) for $2.3 billion. Admittedly, the deal may spook investors in Roku (ROKU -0.95%), which leads the smart TV ads and TV operating system markets, according to market research firm Pixalate. Indeed, Roku stock fell nearly 7% on the day following this announcement.Vizio should benefit from Walmart's vast resources, allowing it to improve its television and ad platforms. However, Roku has managed to compete against ...