Transaction in Own Shares

DIVERSIFIED ENERGY COMPANY PLC

("Diversified", or the "Company")

DIVERSIFIED ENERGY COMPANY PLC (LSE:DEC, NYSE:DEC) announces that, in accordance with the terms of its share buyback programme announced on 20 March 2025, the Company has purchased 145,775 Ordinary Shares of 20 Pence each in the capital of the Company (the "Shares") in the market at a volume-weighted average price of $13.9415 per Share through Mizuho Securities USA LLC (MSUSA). The Shares acquired will, in due course, be cancelled.

Aggregated Information

Date of Purchase:	30 September 2025
Aggregate Number of Ordinary Shares Purchased:	145,775
Lowest Price Paid per Share (USD):	13.865
Highest Price Paid per Share (USD):	14.00
Volume-Weighted Average Price Paid per Share (USD):	13.9415

Following the cancellation of Shares, Diversified will have 77,210,695 Ordinary Shares of 20 Pence each in issue and no Ordinary Shares are held in treasury. This figure of 77,210,695 may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure Guidance and Transparency Rules.

In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 (the Market Abuse Regulation), (as in force in the UK and as amended by the Market Abuse (Amendment) (EU Exit) Regulations 2019), the table below contains detailed information of the individual trades made by Mizuho Securities USA LLC as part of the buyback programme.

Schedule of Purchases

Shares purchased:	DIVERSIFIED ENERGY COMPANY PLC (ISIN: GB00BQHP5P93)
Dates of purchases:	30 September 2025
Investment firm:	Mizuho Securities USA LLC

Aggregate number  of ordinary  shares acquired	Daily volume  weighted average  price paid		Daily highest  price paid  per share		Daily lowest  price per  share	Trading Venue
7,032	$13.9420		$14.00		$13.88	ARCX
2,341	$13.9238		$13.97		$13.88	ASPN
1,771	$13.9244		$13.97		$13.90	BAML
1,378	$13.9445		$13.99		$13.88	BATS
1,189	$13.9257		$13.96		$13.89	BATY
400	$13.9000		$13.90		$13.90	BIDS
200	$13.9000		$13.90		$13.90	BNPC
776	$13.9667		$14.00		$13.88	EDGA
2,020	$13.9329		$13.96		$13.88	EDGX
400	$13.9000		$13.90		$13.90	HRTF
200	$13.9000		$13.90		$13.90	ICBX
99,403	$13.9413		$14.00		$13.87	IEXG
500	$13.9000		$13.90		$13.90	ITGI
2,462	$13.9286		$14.00		$13.89	JPMX
7,674	$13.9357		$14.00		$13.90	JSJX
100	$13.9000		$13.90		$13.90	LEVL
82	$13.9133		$13.94		$13.90	MEMX
2,799	$13.9248		$13.97		$13.88	SGMT
2,315	$13.9411		$14.00		$13.89	UBSA
100	$13.9000		$13.90		$13.90	VFMI
400	$13.9350		$14.00		$13.90	XBOS
100	$13.9400		$13.94		$13.94	XCIS
5,379	$13.9418		$14.00		$13.88	XNAS
6,754	$13.9274		$14.00		$13.88	XNYS
Trading venue	Currency
NYSE	USD		$13.9415		145,775

For further information, please contact:

Diversified Energy Company PLC	[phone]
Doug Kris	[e-mail]
Senior Vice President, Investor Relations & Corporate Communications	www.div.energy

About Diversified Energy Company PLC

Diversified is a leading publicly traded energy company focused on natural gas and liquids production, transport, marketing, and well retirement. Through our differentiated strategy, we acquire existing, long-life assets and invest in them to improve environmental and operational performance until retiring those assets in a safe and environmentally secure manner. Recognized by ratings agencies and organizations for our sustainability leadership, this solutions-oriented, stewardship approach makes Diversified the Right Company at the Right Time to responsibly produce energy, deliver reliable free cash flow, and generate shareholder value.