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Image courtesy of Kodiak Oil & Gas.

Denver-based Whiting Petroleum got the go-ahead from the Federal Trade Commission (FTC) and Department of Justice (DOJ) to acquire Denver-based Kodiak Oil & Gas.

Whiting’s purchase of Kodiak was announced on July 13 and will be paid for with an all-stock transaction worth $6 billion.

The waiting period ended earlier than expected, Whiting said Tuesday.

Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 companies filing for acquisitions must submit their plans to the FTC and the Antitrust Division of the DOJ for approval.

The green light from federal regulators clears a major hurdle for closing.

The deal is expected to close in the fourth quarter of 2014, subject to the approval of Whiting and Kodiak shareholders and certain court approvals.

Whiting is an independent exploration and production company with a focus on oil.

Kodiak is an independent exploration and production company focused on natural gas and crude in the US.

Kodiak’s operations are primarily concentrated in two Rocky Mountain basins, the Williston Basin of North Dakota and Montana and the Green River Basin of Wyoming and Colorado.