Billionaire Ken Griffin's Citadel Advisors has been increasing its stake in drugmaker AbbVie (NYSE: ABBV) in recent months. In the second quarter, Citadel purchased 2.7 million shares of AbbVie at an average price of $234.57, for a total investment of about $633 million. That takes Citadel's stake in AbbVie to 3.2 million shares, worth $909 million at the current share price of about $284. With $571 billion in assets under management, Citadel is the world's largest hedge fund and one of the most successful. So, it's always worth watching what stocks and other assets it is accumulating.
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