SM Energy Company has confirmed a cybersecurity breach in which hackers accessed sensitive personal information, including Social Security numbers and taxpayer identification numbers. The incident was discovered around May 15, 2026, and breach notifications have been sent to affected individuals. Thousands of people may be impacted, while legal investigations and a potential class action are underway. The company is offering two years of free Experian IdentityWorks credit monitoring and identity theft protection, with enrollment open until October 31, 2026.