Oncology Institute patient data accessed in Vendor cybersecurity incident; operations sustained

Oncology Institute, Inc.

On May 20, 2026, Kroll notified TOI that its Vendor detected unauthorized access to TOI patient data systems.
Incident previously disclosed voluntarily in November 2025; now confirmed patient information compromised.
TOI states operations continued in all material respects since detection; offering credit monitoring to affected patients.
Company believes incident also affected other healthcare providers; reserving rights against third parties.
Evaluation ongoing; TOI currently believes no material impact on operations, financial condition, or quality of care.

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