Kullman to Leave DuPont as Activist Signals New Breakup Push

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Ellen Kullman, outgoing chairman and chief executive officer of DuPont.

Photographer: Daniel Acker/Bloomberg

Ellen Kullman abruptly resigned as chairman and chief executive officer of DuPont Co., stepping aside as an activist shareholder appeared ready to reignite a battle to break up the 213-year-old company.

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