Expand Energy (EXE) 425 Business combination disclosure

From: Chris Ayres Subject: Today's Announcement - CHK/SWN Merger Good Morning, This is a transformational day for us, announcing an all-stock combination with Southwestern Energy. I wanted to catch you early with some of the key highlights around this deal and also invite you to join our conference call at 8:00 am CST today (details and link found here). Highlights include: The combination checks all the boxes of our Strategic Pillars. It enhances our returns to shareholders, creates a premier natural gas portfolio, moves us closer to Investment Grade, and boosts the sustainability of the enterprise. Our combined assets will redefine the natural gas producer, forming the first US based independent that is equipped to meet domestic demand growth and compete in the rapidly growing global LNG business. We will have a vast inventory of quality development locations adjacent to key producing natural gas basins in the northeast and along the Gulf Coast. Pro Forma Stats – Average net production of 7.9 bcfe/d (combined 3Q’23 actuals excluding CHK Eagle Ford) Nearly 2 million net acres in Appalachia and the Haynesville >5,000 gross locations or more than 15 years of inventory at our current pace of operations The transaction is accretive across all key per share metrics. This will be an all-stock transaction valued at approximately $24 billion, based on CHK’s closing price on January 10, 2024. It is important to note that the deal is accretive even BEFORE the significant synergies. We have identified about $400 million in annual operating and overhead synergies to date. These will greatly enhance combined corporate breakevens and come through G&A reductions, application of best practices to lower D&C costs and effectively utilizing our shared field infrastructure. We have high confidence in our ability to deliver on these projections and know from past deals that our people will find additional synergies to further enhance future returns.

Higher free cash flows will allow us to increase cash returns to shareholders. We expect 20% more dividends per share over the next five years at early January strip pricing as Chesapeake’s capital return framework is applied. Creates global platform to expand marketing and trading business, reaching more markets, mitigating price volatility and increasing revenue. Importantly, this transaction strengthens our capital structure and moves us closer to an Investment Grade credit rating. Not only will this benefit our future cost of capital, but it will also make us a preferred partner to supply natural gas to consumers on a global scale. The combined company will maintain its low natural gas emissions profile, 100% RSG natural gas certification, commitment to achieving net zero Scope 1 and 2 GHG emissions by 2035, transparent disclosure on measurable targets, investment in low-carbon solutions, and social and governance excellence. For your convenience, I have attached a highlights document which further outlines the transaction. You can also find the associated press release and supplemental slide deck on our website. Please reach out to us with questions any time. I can be reached through the contact details below. I’m looking forward to speaking with you. IMPORTANT ADDITIONAL INFORMATION AND WHERE TO FIND IT In connection with the proposed transaction between Chesapeake and Southwestern, Chesapeake intends to file with the U.S. Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 (the “registration statement”) to register the shares of Chesapeake’s common stock to be issued in connection with the proposed transaction. The registration statement will include a joint proxy statement of Chesapeake and Southwestern and will also constitute a prospectus of Chesapeake (the “joint proxy statement/prospectus”). Each of Chesapeake and Southwestern may also file other documents regarding the proposed transaction with the SEC. This document is not a substitute for the joint proxy statement/prospectus or the registration statement or any other document that Chesapeake or Southwestern may file with the SEC. BEFORE MAKING ANY VOTING DECISION, INVESTORS ARE URGED TO CAREFULLY READ THE REGISTRATION STATEMENT, THE JOINT PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT MAY BE FILED WITH THE SEC IN CONNECTION WITH THE PROPOSED TRANSACTION, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, AS THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT CHESAPEAKE, SOUTHWESTERN, THE PROPOSED TRANSACTION, THE RISKS RELATED THERETO AND RELATED MATTERS. After the registration statement has been declared effective, a definitive joint proxy statement/prospectus

will be mailed to the stockholders of Chesapeake and Southwestern. Investors will be able to obtain free copies of the registration statement and joint proxy statement/prospectus and other relevant documents containing important information about Chesapeake, Southwestern and the proposed transaction, once such documents are filed with the SEC through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Chesapeake may be obtained free of charge on Chesapeake’s website at https://investors.chk.com/. Copies of the documents filed with the SEC by Southwestern may be obtained free of charge on Southwestern’s website at https://ir.swn.com/CorporateProfile/default.aspx. PARTICIPANTS IN THE SOLICITATION Chesapeake and Southwestern and certain of their respective directors, executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies in connection with the proposed transaction contemplated by the joint proxy statement/prospectus. Information regarding Chesapeake’s directors and executive officers and their ownership of Chesapeake’s securities is set forth in Chesapeake’s filings with the SEC, including Chesapeake’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, and its Proxy Statement on Schedule 14A, which was filed with the SEC on April 28, 2023. To the extent such person’s ownership of Chesapeake’s securities has changed since the filing of Chesapeake’s proxy statement, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC thereafter. Information regarding Southwestern’s directors and executive officers and their ownership of Southwestern’s securities is set forth in Southwestern’s filings with the SEC, including Southwestern’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, and its Proxy Statement on Schedule 14A, which was filed with the SEC on April 5, 2023. To the extent such person’s ownership of Southwestern’s securities has changed since the filing of Southwestern’s proxy statement, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC thereafter. Additional information regarding the interests of those persons and other persons who may be deemed participants in the proxy solicitations may be obtained by reading the joint proxy statement/prospectus and other relevant materials that will be filed with the SEC regarding the proposed transaction when such documents become available. You may obtain free copies of these documents as described in the preceding paragraph. NO OFFER OR SOLICITATION This communication relates to the proposed transaction between Chesapeake and Southwestern. This communication is for informational purposes only and shall not constitute an offer to sell or exchange, or the solicitation of an offer to buy or exchange, any securities or a solicitation of any vote or approval, in any jurisdiction, pursuant to the proposed transaction or otherwise, nor shall there be any sale, issuance, exchange or transfer of the securities referred to in this document in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended. FORWARD-LOOKING STATEMENTS This communication contains “forward-looking statements” within the meaning of the federal securities laws. Forward-looking statements may be identified by words such as “anticipates,” “believes,” “cause,” “continue,” “could,” “depend,” “develop,” “estimates,” “expects,” “forecasts,” “goal,” “guidance,” “have,” “impact,” “implement,” “increase,” “intends,” “lead,” “maintain,” “may,” “might,” “plans,” “potential,” “possible,” “projected,” “reduce,” “remain,” “result,” “scheduled,” “seek,” “should,” “will,” “would” and other similar words or expressions. The absence of such words or expressions does not necessarily mean the statements are not forward-looking. Forward-looking statements are not statements of historical fact and reflect Chesapeake’s and Southwestern’s current views about future events. These forward-looking statements include, but are not limited to, statements regarding the proposed transaction between Chesapeake and Southwestern, the expected closing of the proposed transaction and the timing thereof and the proforma combined company and its operations, strategies and plans, integration, debt levels and leverage ratio, capital expenditures, liquidity, return on capital employed, net asset value, cost of capital, operating cash flows, cash flows and anticipated uses thereof, synergies, opportunities and anticipated future performance, capital structure, achievement of investment-grade credit rating, expected accretion

to earnings and free cash flow, anticipated dividends, and natural gas portfolio, demand for products, quality of inventory and ability to deliver affordable lower carbon energy. Information adjusted for the proposed transaction should not be considered a forecast of future results. Although we believe our forward-looking statements are reasonable, statements made regarding future results are not guarantees of future performance and are subject to numerous assumptions, uncertainties and risks that are difficult to predict. Forward-looking statements are based on current expectations, estimates and assumptions that involve a number of risks and uncertainties that could cause actual results to differ materially from those projected. Actual outcomes and results may differ materially from the results stated or implied in the forward-looking statements included in this communication due to a number of factors, including, but not limited to: the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; the possibility that the stockholders of Chesapeake may not approve the issuance of Chesapeake’s common stock in connection with the proposed transaction; the possibility that the stockholders of Southwestern may not approve the merger agreement; the risk that Chesapeake or Southwestern may be unable to obtain governmental and regulatory approvals required for the proposed transaction, or required governmental and regulatory approvals may delay the merger or result in the imposition of conditions that could cause the parties to abandon the merger; the risk that the parties may not be able to satisfy the conditions to the proposed transaction in a timely manner or at all; risks related to disruption of management time from ongoing business operations due to the proposed transaction; the risk that any announcements relating to the proposed transaction could have adverse effects on the market price of Chesapeake’s common stock or Southwestern’s common stock; the risk of any unexpected costs or expenses resulting from the proposed transaction; the risk of any litigation relating to the proposed transaction; the risk that the proposed transaction and its announcement could have an adverse effect on the ability of Chesapeake and Southwestern to retain and hire key personnel, on the ability of Chesapeake and Southwestern to attract third-party customers and maintain its relationships with derivatives counterparties and on Chesapeake’s and Southwestern’s operating results and businesses generally; the risk that problems may arise in successfully integrating the businesses of the companies, which may result in the combined company not operating as effectively and efficiently as expected; the risk that the combined company may be unable to achieve synergies or other anticipated benefits of the proposed transaction or it may take longer than expected to achieve those synergies or benefits and other important factors that could cause actual results to differ materially from those projected; the volatility in commodity prices for crude oil and natural gas, the presence or recoverability of estimated reserves; the ability to replace reserves; environmental risks, drilling and operating risks, including the potential liability for remedial actions or assessments under existing or future environmental regulations and litigation; exploration and development risks; the effect of future regulatory or legislative actions on the companies or the industry in which they operate, including the risk of new restrictions with respect to oil and natural gas development activities; the risk that the credit ratings of the combined business may be different from what the companies expect; the ability of management to execute its plans to meet its goals and other risks inherent in Chesapeake’s and Southwestern’s businesses; public health crises, such as pandemics and epidemics, and any related government policies and actions; the potential disruption or interruption of Chesapeake’s or Southwestern’s operations due to war, accidents, political events, civil unrest, severe weather, cyber threats, terrorist acts, or other natural or human causes beyond Chesapeake’s or Southwestern’s control; and the combined company’s ability to identify and mitigate the risks and hazards inherent in operating in the global energy industry. Other unpredictable or unknown factors not discussed in this communication could also have material adverse effects on forward-looking statements. All such factors are difficult to predict and are beyond Chesapeake’s or Southwestern’s control, including those detailed in Chesapeake’s annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K that are available on its website at https://investors.chk.com/ and on the SEC’s website at http://www.sec.gov, and those detailed in Southwestern’s annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K that are available on Southwestern’s website at https://ir.swn.com/CorporateProfile/default.aspx and on the SEC’s website at http://www.sec.gov. Forward-looking statements are based on the estimates and opinions of management at the time the statements are made. Chesapeake and Southwestern undertake no obligation to publicly correct or update the forward-looking statements in this communication, in other

documents, or on their respective websites to reflect new information, future events or otherwise, except as required by applicable law. All such statements are expressly qualified by this cautionary statement. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof.