Monumental Sports & Entertainment Discloses December 2025 Data Breach Affecting Over 10,000 Individuals Monumental Sports & Entertainment (operating as Lincoln Holdings LLC) reported a data breach that occurred in December 2025, impacting 10,282 individuals across the U.S. The company detected unusual activity on its systems on December 9, 2025, and an investigation revealed that an unauthorized external party accessed and exfiltrated data between December 8 and 9, 2025. While the specific types of compromised personal information were not publicly disclosed, affected individuals received letters detailing which of their data may have been exposed. The breach was officially reported to the Maine Attorney General on April 27, 2026, after the company identified the incident on April 7, 2026. Written notifications to impacted consumers began on April 28, 2026. In response, Monumental Sports & Entertainment is providing 24 months of complimentary identity monitoring services through Kroll, including credit monitoring, fraud consultation, and identity theft restoration. Affected individuals can enroll using a membership number provided in their notification letter. The company has also established a dedicated support line (844-403-4609) for inquiries, available weekdays from 9:00 a.m. to 6:30 p.m. Eastern Time.