Holding(s) in Company

TR-1: Standard form for notification of major holdings

Issuer Name DIVERSIFIED ENERGY COMPANY PLC

An acquisition or disposal of voting rights

3. Details of person subject to the notification obligation

City of registered office (if applicable) Minneapolis

Country of registered office (if applicable) United States

Full name of shareholder(s) if different from the person(s) subject to the notification obligation, above

City of registered office (if applicable)

Country of registered office (if applicable)

5. Date on which the threshold was crossed or reached

7. Total positions of person(s) subject to the notification obligation

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached 8A. Voting rights attached to shares

8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))

8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))

9. Information in relation to the person subject to the notification obligation 2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary)

10. In case of proxy voting Name of the proxy holder

The date until which the voting rights will be held

11. Additional Information Columbia Management Investment Advisers, LLC is wholly owned by Ameriprise Financial, Inc.Columbia Threadneedle Management Limited is wholly owned by Columbia Threadneedle Holdings Limited, which is wholly owned by Columbia Threadneedle Group (Management) Limited, which is wholly owned by Columbia Threadneedle Group (Holdings) Limited, which is wholly owned by Columbia Threadneedle AM (Holdings) Plc, which is wholly owned by Columbia Threadneedle (Europe) Limited, which is wholly owned by Columbia Threadneedle Investments UK International Limited, which is wholly owned by Ameriprise Financial, Inc.