Whiting Petroleum Corporation (NYSE: WLL) today announced that it has extended its offer to exchange (the “Exchange Offer”) all of its outstanding, unregistered 6.625% Senior Notes due 2026 (the “Original Notes”) issued December 27, 2017, for new, registered 6.625% Senior Notes due 2026 (“New Notes”).

The Exchange Offer, which was initially scheduled to expire on July 5, 2018 at 5:00 p.m., New York City time, has now been extended until July 16, 2018 at 5:00 p.m., New York City time, unless further extended by Whiting. As of the issuance of this press release, Whiting had been notified that holders of approximately 90.65% of the outstanding principal of the Original Notes had tendered their Original Notes in the Exchange Offer. Additionally, registered holders of the Original Notes on the July 1, 2018 record date for the July 15, 2018 interest payment date for the Original Notes will be entitled to accrued interest from the December 27, 2017 issuance date through such payment date (payment will occur on July 16, 2018 because July 15, 2018 is not a business day). Accordingly, the New Notes will accrue interest from the July 15, 2018 payment date for the Original Notes, not December 27, 2017. Except for the foregoing, all of the other terms of the Exchange Offer remain as set forth in the exchange offer prospectus, dated June 6, 2018, filed with the U.S. Securities and Exchange Commission, and the related transmittal materials for making tenders.

About Whiting Petroleum Corporation

Whiting Petroleum Corporation, a Delaware corporation, is an independent oil and gas company that develops, produces, acquires and explores for crude oil, natural gas and natural gas liquids primarily in the Rocky Mountains region of the United States. The Company’s largest projects are in the Bakken and Three Forks plays in North Dakota and Montana and the Niobrara play in northeast Colorado. The Company trades publicly under the symbol WLL on the New York Stock Exchange. For further information, please visit http://www.whiting.com.

Whiting Petroleum Corporation

Eric K. Hagen, 303-837-1661

Vice President, Investor Relations

[email protected]

The Oil and Gas Conference®

Whiting Petroleum Corporation is presenting at EnerCom’s The Oil & Gas Conference® at the Denver Downtown Westin Hotel, Denver, Colo. Aug. 19-23, 2018. EnerCom expects to have more than 80 presenting oil and gas companies and more than 2000 financial professionals attending this year’s conference.

To learn more about the conference and presenter schedule please visit the conference website here.

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