SM ENERGY COMPANY ANNOUNCES CASH TENDER OFFER FOR UP TO $750.0 MILLION AGGREGATE PRINCIPAL AMOUNT OF 8.375% SENIOR NOTES DUE 2028 ORIGINALLY ISSUED BY CIVITAS RESOURCES

Core Viewpoint - SM Energy Company has initiated a cash tender offer to purchase up to $750 million of outstanding 8.375% Senior Notes due 2028, originally issued by Civitas Resources, Inc. and assumed by SM Energy following its merger with Civitas [1] Group 1 - The tender offer is for an aggregate principal amount not to exceed $750,000,000, which may be modified by SM Energy [1] - The notes involved in the tender offer are identified by CUSIP Numbers Rule 144A: 17888HAA1 and Reg. S: U1638HAA5 [1] - The tender offer is subject to the terms and conditions outlined in the Offer to Purchase dated March 4, 2026, which may be amended or supplemented [1]