Diversified Energy Co

For the period ended May 6, 2026. Filed May 6, 2026.

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A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

May 6, 2026 · Filed May 6, 2026

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DEC$12.70-0.8%Stored close · as of Nov 6, 2026

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Contents

EX-99.1 · Unlocking Value Through Portfolio Optimization

Unlocking Value Through Portfolio Optimization

Our Portfolio Optimization Program ("POP") realized over $100M from non-core asset and leasehold divestitures

Our POP highlights optionality in DEC’s expansive and diverse portfolio to monetize our acreage position via Non-Op Partnerships or leasehold divestitures

Generated ~$3M of cash flow from environmental credits related to Coal Mine Methane (CMM) in 1Q26

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