Diversified Energy Company PLC

Share Issue/Capital Change • Dec 17, 2025

National Storage Mechanism | Additional information

DIVERSIFIED ENERGY COMPANY

("Diversified", or the "Company")

DIVERSIFIED ENERGY COMPANY (NYSE:DEC; LSE:DEC) announces that, in accordance with the terms of its share buyback program announced on March 20, 2025, the Company has purchased 158,447 shares of common stock, par value $0.01 per share of the Company (the "Shares") in the market at a volume-weighted average price of $13.7436 per Share through Mizuho Securities USA LLC (MSUSA). The Shares acquired will, in due course, be cancelled.

Aggregated Information

Date of Purchase:	December 16, 2025
Aggregate Number of Shares Purchased:	158,447
Lowest Price Paid per Share (USD):	13.595
Highest Price Paid per Share (USD):	13.94
Volume-Weighted Average Price Paid per Share (USD):	13.7436

Following the cancellation of Shares, Diversified will have 80,164,402 shares of common stock in issue and no shares of common stock held in treasury. This figure of 80,164,402 shares 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 program.

Schedule of Purchases

Shares purchased:	DIVERSIFIED ENERGY COMPANY (ISIN: US25520W1071)
Dates of purchases:	16 December 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
4,942	$13.7298		$13.85
608	$13.7138		$13.79
500	$13.7342		$13.78
983	$13.7406		$13.85
981	$13.7563		$13.90
256	$13.7150		$13.82
1,574	$13.7505		$13.85
116,239	$13.7428		$13.94
1,853	$13.7086		$13.79
3,733	$13.7180		$13.81
3,000	$13.7850		$13.79
139	$13.6780		$13.71
7,068	$13.7471		$13.90
500	$13.7338		$13.92
299	$13.7875		$13.82
8,593	$13.7516		$13.92
7,179	$13.7279		$13.90
Trading venue	Currency
NYSE	USD		$13.7436

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For further information, please contact:**

Diversified Energy Company	+1 973 856 2757
Doug Kris	[email protected]
Senior Vice President, Investor Relations & Corporate Communications	www.div.energy

About Diversified Energy Company

Diversified is a leading publicly traded energy company focused on acquiring, operating, and optimizing cash generating energy assets. 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.