CNBC's Stock Pops & Drops From May 11

, Dan Nathan spoke about

. The stock gained 0.59 percent on Monday and Nathan advised the viewers who wish to buy it to define the risk because it struggled recently and there could be more downside. Steve Grasso would take some profits in

after it gained 1.66 percent on Monday. He is concerned that competition is going to increase for the company. Pete Najarian explained that an analyst questioned if the products of

are legitimate and the stock fell 8.19 percent. He added that it will have tough time recovering from the issue. Tim Seymour said that

jumped 5.15 percent on speculations that

could increase its stake in the company.