Morningside Provides Notice Following Data Security Incident OLYMPIA, WASHINGTON – Morningside experienced a data security incident that involved personal and / or protected health information belonging to certain current and former patients and has provided notice of this incident to impacted individuals. Morningside has sent notification of this incident to potentially impacted individuals and has provided resources to assist them. On or about November 17, 2025, they learned that personal information of certain individuals was subject to unauthorized access and acquisition. The incident was the result of suspicious activity it first learned of on or about June 20, 2025. Upon discovery, Morningside took steps to secure its network and engaged a leading, digital forensics and incident response firm to investigate what happened and whether any sensitive data may have been impacted. The investigation revealed certain personal / protected health information was accessed and acquired without authorization by an unknown actor on or around June 20, 2025. Morningside undertook a comprehensive review of the impacted data to identify the individuals and information involved, which concluded on November 17, 2025. Morningside then took steps to provide notification as quickly as possible. The potentially impacted information may have included names, addresses, dates of birth, driver's license information, Social Security numbers, medical information, and health insurance information. Please note that not all data elements were affected for all individuals. Morningside provided notice of this incident to potentially impacted individuals beginning on December 11, 2025. Morningside has established a toll-free call center to answer questions about the incident and to address related concerns. Call center representatives are available Monday through Friday between 6:00 am – 3:00 pm PT, excluding holidays, and can be reached at 1-844-572-2708. The privacy and protection of all personal and protected health information is a top priority for Morningside, which deeply regrets any inconvenience or concern this may cause. Media Contact: Matthew Toldero, mtoldero@constangy.com IPL0304019 Jan 11 2026