Jim Bell reportedly was forced to resign as part of a push by activist investor Ryan Cohen to "reshape the ailing retailer.”
The agreement averts a battle over Twitter CEO Jack Dorsey's leadership but "lays the groundwork for eventually replacing" him.
Twitter shares jumped on reports that Elliott Management is seeking to replace Jack Dorsey because he also runs Square.
A record 99 campaigns globally had an M&A-related thesis, accounting for about 47% of all the year's activity.
The activist investor believes AT&T is deeply undervalued, citing its "irreplaceable assets, enormous earnings power and an ability to win in key markets."
The struggling restaurant chain said its strategic plan is a better option for long-term shareholder value than Vintage Capital's offer.
The activist fund allegedly failed to comply with premerger notification rules before acquiring stock in DowDuPont two years ago.
The German software giant has prioritized revenue growth but is now taking steps to boost the profitability of its cloud business.
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eBay's shares rose 6% after Elliott Management disclosed a 4% stake in the company and unveiled a plan to unlock strategic value.
Third Point's Daniel Loeb believes internal company documents could boost his bid to replace Campbell's entire board.
The finance veteran joins Nielsen as the media ratings firm faces pressure from activist investor Elliott Management to sell itself.
