Stocks making the biggest moves after hours: Roku, Walmart, Slack and more

Stocks making the biggest moves after hours: Roku, Walmart, Slack and more

A video sign displays the logo for Roku Inc, a Fox-backed video streaming firm, in Times Square after the company’s IPO at the Nasdaq Market in New York, U.S., September 28, 2017.
Brendan McDermid | Reuters

Check out the companies making headlines after the bell:
Roku shares climbed more than 4% after news broke Thursday that Citadel and its billionaire founder & CEO Ken Griffin took a 5% stake in…

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