NEW YORK  — The former chairman of Dean Foods is the subject of an investigation into insider trading, according to a report in the Wall Street Journal.

Dean Foods did not confirm the specifics about the investigation but said it was cooperating with a government investigation.

Thomas Davis, CEO of private investment firm The Concorde Group, resigned as chairman of the board of directors abruptly on Friday. He had been a director since 2001 and became non-executive chairman in 2013.

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