Roku (ROKU) stock plunged Friday after the company reported disappointing first quarter guidance and mixed fourth-quarter results. Evercore ISI Director of Internet Equity Research Shweta Khajuria joins Yahoo Finance Live to discuss. Khajuria says there are two thing that have her more "incrementally negative" on the stock: while Roku beat revenue expectations, growth wasn't as robust as prior quarters. Additionally, the weak first-quarter outlook "implies" slowing expansion. However, she notes Roku did a "great job cutting costs" though, now it's shifting focus to reigniting top-line growth. Regarding advertising, Khajuria says Roku boasts a "very large audience" with strong user data to supply advertisers. However, when it comes to advertising, the core challenge remains: "Is that platform's [Roku] value proposition diminishing because there is greater supply than there is demand?" For more expert insight and the latest market action, click here to watch this full episode of Yahoo Finance Live. Editor's note: This article was written by Angel Smith

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