Not even the wealthiest, most successful investors are immune from trading blunders. Some of the most famous fund managers and investing gurus have dropped the ball and mistimed their buys and sells.

Here’s a look at six times top investors probably thought, “Whoops!”

1. Ackman And Valeant

Pershing Square Capital’s Bill Ackman has had a roller-coaster of success and failures in recent years. Perhaps no failure has been as highly publicized as his stake in Valeant Pharmaceuticals, which is now Bausch Health Companies Inc BHC 0.3%.

Ackman reportedly first took his massive stake in Valeant back in 2015 at an average price of around $196 per share. He then defended the company as the share price tanked over the next two years before finally unloading his position in March 2017 at a price of around $11 per share. Ackman reportedly took a $3-billion loss on Valeant.

2. Einhorn’s Miss

Geenlight Capital value investor David Einhorn disclosed a 27.1-million-share stake in solar power company SunEdison in January 2016 when the stock was trading at around $2.70. By the time Einhorn dumped 75% of his SunEdison stake in early 2016, the stock was trading at 32 cents pending a bankruptcy filing and delisting from the NYSE…..CLICK for complete article