5 of Today's Biggest Marijuana Stock Losers - Friday, May 18 By: TalkMarkets May 18, 2018 at 23:30 PM EDT Here are just 5 of the biggest marijuana stock losers in trading on Friday, May 18th. Read More >> Related Stocks: Argent Biopharma Ltd Cannagrow Holdings Inc Diego Pellicer Worldwide Inc Potnetwork Holdings Inc Zelda Therapeutics Ltd