Stocks making the biggest moves premarket: Walmart, Slack, WPP, SAP, J&J, Roku & more
Check out the companies making headlines before the bell:
Walmart – Walmart U.S. stores chief Greg Foran will leave the retailer on Jan. 31 to become chief executive officer of Air New Zealand. He will be replaced by John Furner, who runs Walmart’s Sam’s Club warehouse chain.
Slack Technologies – Slack said it had more than 12 million active daily users during September, up 37% from a year ago.…