Google, Walmart, and Disney are among the many companies that shook up their financial leadership this year

According to an analysis by The Wall Street Journal, about a quarter of companies in the S&P 100 announced this year that they were bringing in a new finance chief or the current one was departing. Included among them are Google, Walmart, Comcast, and Disney. "I've never seen so much volatility," Peter Crist, chairman of executive search firm Crist|Kolder Associates, told The Journal. An increase in mergers and acquisitions, as well as several retirements, may be behind the high volume of executive shake-ups in 2015.

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