UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: July 11, 2019
Form: S-4
CIK: 0001539838
Company Name: Diamondback Energy, Inc.
File Number: 333-230446
CIK: 0001771381
Company Name: EGN Services, Inc.
File Number: 333-230446-05
CIK: 0001771397
Company Name: Energen Resources Corp
File Number: 333-230446-04
CIK: 0000277595
Company Name: ENERGEN CORP
File Number: 333-230446-03
CIK: 0001590692
Company Name: Diamondback Energy E&P LLC
File Number: 333-230446-02
CIK: 0001590696
Company Name: Diamondback Energy O&G LLC
File Number: 333-230446-01
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