ADDITIONAL INFORMATION AND WHERE TO FIND IT
In connection with the proposed merger (the “Proposed Transaction”) of Devon Energy Corporation (“Devon”) and Coterra Energy Inc.
(“Coterra”), Devon will file with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 to register the shares of Devon’s common stock to be
issued in connection with the Proposed Transaction. The registration statement will include a document that serves as a prospectus of Devon and a joint proxy statement of each of Devon and Coterra (the “joint
proxy statement/prospectus”), and each party will file other documents regarding the Proposed Transaction with the SEC. INVESTORS AND SECURITY HOLDERS OF DEVON AND COTERRA ARE URGED TO READ THE REGISTRATION STATEMENT, THE JOINT PROXY
STATEMENT/PROSPECTUS, INCLUDING ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, AND ANY OTHER RELEVANT DOCUMENTS THAT WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT
INFORMATION ABOUT DEVON, COTERRA, THE PROPOSED TRANSACTION AND RELATED MATTERS. A definitive joint proxy statement/prospectus will be sent to stockholders of each of Devon and Coterra when it becomes available. Investors and security holders
will be able to obtain copies of the registration statement and the joint proxy statement/prospectus and other documents containing important information about Devon and Coterra free of charge from the SEC’s website when it becomes
available. The documents filed by Devon with the SEC may be obtained free of charge at Devon’s website at investors.devonenergy.com or at the SEC’s website at www.sec.gov. These documents may also be obtained free of charge
from Devon by requesting them by mail at Devon, Attn. Investor Relations, 333 West Sheridan Ave, Oklahoma City, OK 73102. The documents filed by Coterra with the SEC may be obtained free of charge at Coterra’s website at
investors.coterra.com or at the SEC’s website at www.sec.gov. These documents may also be obtained free of charge from Coterra by requesting them by mail at Coterra, Attn: Investor Relations, Three Memorial City Plaza, 840 Gessner Road,
Suite 1400, Houston, Texas 77024.
PARTICIPANTS IN THE SOLICITATION
Devon, Coterra 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 from Devon’s and Coterra’s stockholders with respect to the Proposed Transaction. Information about Devon’s directors and executive officers is available in Devon’s Annual Report on Form 10-K for the 2025 fiscal year filed with the SEC on February 18, 2026 (and which is available at
https://www.sec.gov/ix?doc=/Archives/edgar/data/0001090012/000119312526056485/dvn-20251231.htm), and its definitive proxy statement for the 2025 annual meeting of shareholders filed with the SEC on
April 23, 2025 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0001090012/000110465925037545/tm252204-6_def14a.htm). Information about Coterra’s directors and executive
officers is available in Coterra’s Annual Report on Form 10-K for the 2024 fiscal year filed with the SEC on February 25, 2025 (and which is available at
https://www.sec.gov/ix?doc=/Archives/edgar/data/0000858470/000085847025000075/cog-20241231.htm), and its definitive proxy statement for the 2025 annual meeting of shareholders filed with the SEC on
March 20, 2025 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000858470/000110465925026126/tm2429648-2_def14a.htm). Other information regarding the participants in the proxy
solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the registration statement, the joint proxy statement/prospectus and other relevant materials to be filed with the SEC
regarding the Proposed Transaction when they become available. Stockholders, potential investors and other readers should read the joint proxy statement/prospectus carefully when it becomes available before making any voting or investment decisions.
NO OFFER OR SOLICITATION
This communication
is not intended to and shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote of approval, nor shall there be any sale of securities in any
jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. 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 includes “forward-looking statements” as defined by the SEC. Such statements include those concerning strategic plans,
Devon’s and Coterra’s expectations and objectives for future operations, as well as other future events or conditions, and are often identified by use of the words and phrases such as “expects,” “believes,”
“will,” “would,” “could,” “continue,” “may,” “aims,” “likely to be,” “intends,” “forecasts,” “projections,”
“estimates,” “plans,” “expectations,” “targets,” “opportunities,” “potential,” “anticipates,” “outlook” and other similar terminology. All statements,
other than statements of historical facts, included in this communication that address activities, events or developments that Devon or Coterra expects, believes or anticipates will or may occur in the future are forward-looking statements. Such
statements are subject to a number of assumptions, risks and uncertainties, many of which are beyond Devon’s and Coterra’s control. Consequently, actual future results could differ materially and adversely from Devon’s and
Coterra’s expectations due to a number of factors, including, but not limited to those, identified below.