Why Roku Stock Is Tumbling Today

Investors are seeing the streaming technology company's glass as half empty rather than half full.By most measures, it was a solid first quarter. The top and bottom lines improved year over year, and both rolled in above analysts' consensus estimates. The company expanded its active customer base, too, and collectively, those customers increased their usage of the product.And yet, Roku (ROKU -8.62%) shares are down to the tune of 8.6% as of 12:36 p.m. ET Friday, reflecting investors' frustration over the st ...