Billionaire Ken Griffin More Than Doubled His Stake In This Market-Beating Growth Stock

"Billionaire" and "successful hedge fund manager" are titles that carry significant weight on Wall Street. These and others apply to Ken Griffin, CEO and founder of Citadel. It's no surprise that investors and analysts carefully scrutinize the hedge fund's every move, of which there were several noteworthy during the fourth quarter.One of them had to do with Citadel's position in the pharmaceutical giant Eli Lilly (LLY -2.46%). Ken Griffin and his team increased their stake in this leading drugmaker by 184% ...