2025 Monumental Sports & Entertainment - external access and data theft affecting 10,282 individuals
Data compromised
Social Security numbers, financial account or credit/debit information, and health records, varying by individual
Technical writeup
Monumental Sports & Entertainment, legally Lincoln Holdings LLC, disclosed that it detected unusual activity on December 9, 2025. Its investigation found that an external party accessed systems and removed copies of data between December 8 and 9, 2025. The company discovered reportable impact on April 7, 2026, reported to several state attorneys general starting April 27, and began notifying affected consumers on April 28, 2026.
Root cause
Unauthorized external access to company systems and exfiltration of files