Atmos Energy Corporation $(ATO)$ has announced the pricing of a $600 million public offering of 5.450% Senior Notes due 2056. The underwritten offering was entered into on September 18, 2025, with BNP Paribas Securities Corp., Credit Agricole Securities $(USA)$ Inc., Mizuho Securities USA LLC, and U.S. Bancorp Investments, Inc. acting as representatives of the several underwriters. After deducting underwriting discounts and estimated offering expenses, Atmos Energy expects to receive net proceeds of approximately $589.8 million. The offering is registered under the Securities Act of 1933 via Form S-3 (Registration No. 333-283563), and is expected to close on or about October 1, 2025, subject to customary closing conditions. The full prospectus supplement is available at https://www.sec.gov/Archives/edgar/data/731802/000119312525242176/d769975d424b2.htm.