REG-Transaction in Own Shares

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 80,000 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 $13.9561 per Share through Mizuho Securities USA LLC (MSUSA). The Shares acquired will, in due course, be cancelled.

Date of Purchase: September 24, 2026 Aggregate Number of Shares Purchased:80,000 Lowest Price Paid per Share (USD):$13.80 Highest Price Paid per Share (USD):$14.015 Volume-Weighted Average Price Paid per Share (USD):$13.9561