Viking Global Investors CFO Barrett Brown is stepping down from his position at the hedge fund management company.  A search for a replacement CFO is underway, according to Reuters. The move comes only a few months after the departure of co-CIO Tom Purcell from the firm in March, leaving Dan Sundheim as the sole CIO. At more than $30 billion in assets under management, Viking is one of the largest U.S.-based hedge fund managers. It was founded in 1999 by former Tiger Management executive Andreas Halvorsen, who is the fim's CEO. The firm’s largest hedge fund, Viking Global Equities, was...