Bill Ackman and David Einhorn are considered top hedge fund managers in the world, but they might as well be on a seesaw this week.
Ackman, Pershing Square Capital Management's founder and CEO, first revealed his short position Herbalife in late 2012, but the company's stock has surged 37 percent since then.
He told CNBC on Monday "if you find yourself as an Herbalife employee today, my advice is that you should leave the company because this is not going to be a good thing on your resume. I'd go find another job."
But on Thursday, Herbalife said its talks with the Federal Trade Commission were in advanced stages and could face a payment of about $200 million if the long-running investigation ends in a settlement.
HLF in past 12 monthsSource: FactSet