Major PepsiCo investor launches campaign for overhaul

macro soft drink,Glass of tasty refreshing cola with ice cubes on black background, closeup,Cola close-up
PepsiCo unveils Pepsi Prebiotic Cola - what it describes as the first significant innovation in the traditional cola category in 20 years. (Getty Images/iStockphoto)

Elliott Investment Management, with a $4bn stake in the company, wants to shake things up