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Communications in this email are for informational purposes only and are not intended to and do not constitute an offer to sell or a solicitation of an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, in any jurisdiction, with respect 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 (the “Securities Act”).

In connection with the proposed transaction, APA has filed with the SEC a registration statement on Form S-4 (the “Registration Statement”) that includes a joint proxy statement of Callon and APA and a prospectus of APA (the “Joint Proxy Statement/Prospectus”). The proposed transaction will be submitted to Callon’s stockholders and APA’s stockholders for their consideration. Callon and APA may also file other documents with the SEC regarding the proposed transaction. The definitive Joint Proxy Statement/Prospectus will be sent to the stockholders of Callon and APA. This email is not a substitute for the Registration Statement and Joint Proxy Statement/Prospectus that has been filed with the SEC or any other document that Callon or APA has filed or may file with the SEC and send to Callon’s stockholders and/or APA’s stockholders in connection with the proposed transaction. INVESTORS AND SECURITY HOLDERS OF CALLON AND APA ARE URGED TO READ THE REGISTRATION STATEMENT AND JOINT PROXY STATEMENT/PROSPECTUS, AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME, AND ALL OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT CALLON, APA, THE PROPOSED TRANSACTION, THE RISKS RELATED THERETO AND RELATED MATTERS.

Investors and security holders will be able to obtain free copies of the Registration Statement and Joint Proxy Statement/Prospectus, as each may be amended or supplemented from time to time, and all other relevant documents that are filed or will be filed with the SEC through the website maintained by the SEC at http://www.sec.gov. Copies of documents filed with the SEC by Callon will be made available free of charge on Callon’s website at http://www.callon.com under the “Investors” tab or by contacting Callon’s Investor Relations Department at (281)

Callon, APA and their respective directors and certain of their executive officers and other members of management and employees may be deemed, under SEC rules, to be participants in the solicitation of proxies from Callon’s stockholders and APA’s stockholders in connection with the proposed transaction. Information regarding the executive officers and directors of Callon is included in its definitive proxy statement for its 2023 annual meeting filed with the SEC on March 13, 2023 and certain of its Current Reports on Form 8-K. You can obtain a free copy of this document at the SEC’s website at http://www.sec.gov or by accessing Callon’s website at http://www.callon.com. To the extent holdings of Callon’s securities by such executive officers and directors have changed since the amounts printed in the definitive proxy statement for Callon’s 2023 annual meeting, such changes have been or will be reflected on Initial Statements of Beneficial Ownership on Form 3 or Statements of Changes in Beneficial Ownership on Form 4 filed with the SEC. Information regarding the executive officers and directors of APA is included in its definitive proxy statement for its 2023 annual meeting filed with the SEC on April 11, 2023 and certain of its Current Reports on Form 8-K. You can obtain a free copy of this document at the SEC’s website at http://www.sec.gov or by accessing APA’s website at http://www.apacorp.com. To the extent holdings of APA’s securities by such executive officers and directors have changed since the amounts printed in the definitive proxy statement for APA’s 2023 annual meeting, such changes have been or will be reflected on Initial Statements of Beneficial Ownership on Form 3 or Statements of Changes in Beneficial Ownership on Form 4 filed with the SEC. Investors may obtain additional information regarding the participants in the solicitations and a description of their direct and indirect interests, by security holdings or otherwise, by reading the Registration Statement, Joint Proxy Statement/Prospectus and other relevant materials filed with the SEC regarding the proposed transaction. Stockholders of Callon and APA, potential investors and other readers should read the Joint Proxy Statement/Prospectus carefully before making any voting or investment decisions.

Certain statements in this email concerning the proposed transaction, including any statements regarding the expected timetable for completing the proposed transaction, the results, effects, benefits and synergies of the proposed transaction, future opportunities for the combined company, future financial performance and condition, guidance and any other statements regarding Callon’s or APA’s future expectations, beliefs, plans, objectives, financial conditions, assumptions or future events or performance that are not historical facts are “forward-looking” statements based on assumptions currently believed to be valid. Forward-looking statements are all statements other than statements of historical facts. The words “anticipate,” “believe,” “ensure,” “expect,” “if,” “intend,” “estimate,” “probable,” “project,” “forecasts,” “predict,” “outlook,” “aim,” “will,” “could,” “should,” “would,” “potential,” “may,” “might,” “anticipate,” “likely,” “plan,” “positioned,” “strategy,” and similar expressions or other words of similar meaning, and the negatives thereof, are intended to identify forward-looking statements. The forward-looking statements are intended to be subject to the safe harbor provided by Section 27A of the Securities Act, Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995.

These forward-looking statements involve significant risks and uncertainties that could cause actual results to differ materially from those anticipated, including, but not limited to, failure to obtain the required votes of Callon’s stockholders or APA’s stockholders to approve the transaction and related matters; the risk that a condition to closing of the proposed transaction may not be satisfied, that either party may terminate the merger agreement or that the closing of the proposed transaction might be delayed or not occur at all; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the transaction; the diversion of management time on transaction-related issues; the ultimate timing, outcome and results of integrating the operations of Callon and APA; the effects of the business combination of Callon and APA, including the combined company’s future financial condition, results of operations, strategy and plans; the ability of the combined company to realize anticipated synergies in the timeframe expected or at all; changes in capital markets and the ability of the combined company to finance operations in the manner expected; regulatory approval of the transaction; the effects of commodity price changes; and the risks of oil and gas activities. Expectations regarding business outlook, including changes in revenue, pricing, capital expenditures, cash flow generation,

Additional factors that could cause results to differ materially from those described above can be found in Callon’s Annual Report on Form 10-K for the year ended December 31, 2022 and in its subsequent Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023, June 30, 2023 and September 30, 2023, each of which is on file with the SEC and available on Callon’s website at http://www.callon.com under the “Investors” tab, and in other documents Callon files with the SEC, in APA’s Annual Report on Form 10-K for the year ended December 31, 2022 and in its subsequent Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023, June 30, 2023 and September 30, 2023, each of which is on file with the SEC and available on APA’s website at http://www.apacorp.com under the “Investors” tab, and in other documents APA files with the SEC, and in the Registration Statement.

All forward-looking statements speak only as of the date they are made and are based on information available at that time. Neither Callon nor APA assumes any obligation to update forward-looking statements to reflect circumstances or events that occur after the date the forward-looking statements were made or to reflect the occurrence of unanticipated events except as required by federal securities laws. As forward-looking statements involve significant risks and uncertainties, caution should be exercised against placing undue reliance on such statements.