Delek US Investigates Possible Data Breach Linked to Helix Hacker Group Delek US, a Tennessee-based energy and refining company, is under investigation following reports of a potential data breach. The suspected incident, which may have occurred on August 19, 2026, has been attributed to the hacker group Helix, according to a post on the dark web security site Ransomware.live. Attorneys working with ClassAction.org are examining whether a class action lawsuit can be filed on behalf of affected individuals, including current and former employees, clients, and others associated with Delek US. Those who believe their data may have been exposed are being urged to contact legal representatives as part of the investigation. No details have been confirmed regarding the scope or nature of the breach. The investigation aims to determine potential harm, such as loss of privacy, financial costs, or other damages, and could result in compensation if a lawsuit proceeds. Delek US has not yet released an official statement on the matter.