Fiat Chrysler Automobiles CEO Sergio Marchionne has asked his counterpart at General Motors to consider a merger. Bill Pugliano/Getty Images hide caption

itoggle caption Bill Pugliano/Getty Images

Federal regulators are considering whether to approve the proposed $45 billion merger of Comcast and Time Warner Cable. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

There were $3 trillion worth of corporate mergers in 2014. Comcast's proposed acquisition of fellow cable company Time Warner was the largest at $45 billion. Gene J. Puskar/AP hide caption

itoggle caption Gene J. Puskar/AP

Last month, demonstrators protested the possibility of Walgreens moving its corporate headquarters overseas at a Chicago location of the pharmacy. Scott Olson/Getty Images hide caption

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"I was scratching my head," one analyst says of news that AT&T will acquire satellite TV company DirecTV for $48.5 billion in cash and stock, or $95 per share. Analysts are mixed in their reactions to the deal. Seth Perlman, Reed Saxon/AP hide caption

itoggle caption Seth Perlman, Reed Saxon/AP