TR-1: Standard form for notification of major holdings

1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached ii:DIVERSIFIED ENERGY PLC1b. Please indicate if the issuer is a non-UK issuer (please mark with an “X” if appropriate)Non-UK issuer 2. Reason for the notification (please mark the appropriate box or boxes with an “X”)An acquisition or disposal of voting rightsXAn acquisition or disposal of financial instruments An event changing the breakdown of voting rights Other (please specify) iii: 3. Details of person subject to the notification obligation ivNameEIG ASSET MANAGEMENT LLCCity and country of registered office (if applicable)WASHINGTON D.C., U.S.A.4. Full name of shareholder(s) (if different from 3.) vName City and country of registered office (if applicable) 5. Date on which the threshold was crossed or reached vi:18 September 20256. Date on which issuer notified (DD/MM/YYYY):24/09/20257. Total positions of person(s) subject to the notification obligation % of voting rights attached to shares (total of 8. A)% of voting rights through financial instruments
(total of 8.B 1 + 8.B 2)Total of both in % (8.A + 8.B)Total number of voting rights held in issuer (8.A + 8.B) viiResulting situation on the date on which threshold was crossed or reached9,601,585 12.409,601,585Position of previous notification (if
applicable)14,330,718 18.50

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached viiiA: Voting rights attached to sharesClass/type of
shares
ISIN code (if possible) Number of voting rights ix% of voting rightsDirect
(DTR5.1)Indirect
(DTR5.2.1)Direct
(DTR5.1)Indirect
(DTR5.2.1)GB00BQHP5P93 9,601,585 12.40 SUBTOTAL 8. A B 1: Financial Instruments according to DTR5.3.1R (1) (a)Type of financial instrumentExpiration
date xExercise/
Conversion Period xiNumber of voting rights that may be acquired if the instrument is
exercised/converted.% of voting rights SUBTOTAL 8. B 1 B 2: Financial Instruments with similar economic effect according to DTR5.3.1R (1) (b)Type of financial instrumentExpiration
date xExercise/
Conversion Period xiPhysical or cash
Settlement xiiNumber of voting rights % of voting rights SUBTOTAL 8.B.2

9. Information in relation to the person subject to the notification obligation (please mark the
applicable box with an “X”)Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer xiii 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 entity (please add additional rows as necessary) xivXName xv% of voting rights if it equals or is higher than the notifiable threshold% of voting rights through financial instruments if it equals or is higher than the notifiable thresholdTotal of both if it equals or is higher than the notifiable thresholdEIG Asset Management LLC (Parent) EIG Redwood Co-Investment, L.P. (Chain 1)0.541% 0.541%EIG Redwood XV Blocker Agent (Redwood), Inc. (Chain 2)0.469% 0.469%EIG Holdings Carry Splitter (Redwood), L.P. (Chain 3)1.674% 1.674%EIG Energy Fund XV, L.P. (Chain 4)1.227% 1.227%EIG Energy Fund XV-A, L.P. (Chain 5)0.838% 0.838%EIG Energy Fund XVI,
L.P. (Chain 6)4.517% 4.517%EIG Energy Fund XVI-E, L.P. (Chain 7)0.073% 0.073%EIG Energy Fund XVI Holding Splitter (Fourpoint), L.P. (Chain 8)2.064% 2.064%EIG Energy Fund XV Blocker Series C (Fourpoint) LLC (Chain 9)0.997% 0.997% 10. In case of proxy voting, please identify:Name of the proxy holder The number and % of voting rights held The date until which the voting rights will be held 11. Additional information xviThe information in this Form has been completed using an issued share capital of 77,434,079 shares in the capital of the Company, as announced by the Company on 23 September 2025

Place of completionLondonDate of completion26 September 2025