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Aubrey McClendon

American Energy Partners has agreed to buy Marcellus, Utica, and Permian shale acreage in three separate transactions for a total of $4.25 billion.

The combined purchase is the largest yet for American Energy, founded by former Chesapeake CEO Aubrey McClendon last year

McClendon, a founder of Chesapeake Energy, was ousted as CEO in April 2013 after a governance scandal.

He had retained a 2.5 percent interest in all the oil and gas wells Chesapeake drilled during his tenure, reported by the company to number about 47,500.

American Energy — the company he founded a month after leaving Chesapeake — has raised equity and debt of around $10 billion from private-equity backers to fund acquisitions.