An activist hedge fund has reportedly amassed a $400 million stake in yogurt maker Danone

Activist hedge fund Corvex Management is loading up on shares of Danone, the $53 billion French conglomerate that sells yogurts like YoCrunch and Activia as well as Evian bottled water.
Corvex recently bought a $400 million stake in Danone — known in the US for its Dannon subsidiary — claiming weak sales and stock performance of late have led investors to undervalue the firm, according to a Bloomberg report.
Danone stock was up more than 4% through mid-afternoon Monday. 
Corvex,