Exxon Mobil’s $4.9 billion acquisition of Denbury Inc. has apparently cleared an antitrust regulation, Denbury said in a Sept. 12 news release.

Denbury said the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 has expired. An antitrust review was possible after Exxon agreed to acquire Denbury in an all-stock transaction in July.

Completion of the transaction is subject to the satisfaction of the remaining customary closing conditions, including approval by Denbury stockholders. The transaction is expected to close in the fourth quarter.