Recently, Gesa reported to the Attorney General of Washington that it had experienced a data breach in which sensitive personal identifiable information in its care may have been compromised. According to the breach notice, on August 14, Marquis Software Solutions (“Marquis”), a third-party vendor for Gesa, detected suspicious activity on its network and determined that it had experienced a ransomware attack.1 As a result, Marquis launched an investigation to determine the nature of the incident. Through its investigation, Marquis confirmed to Gesa that sensitive personal information in its systems may have been accessed and acquired by an unauthorized third party during the breach. As a result, Marquis began a review of the data to determine what information had been impacted as well as identify the specific individuals affected. While the information impacted varies depending on the individual, the type of information potentially exposed includes: Name Social Security number Address Phone number Taxpayer identification number Financial account information without security or access codes Date of birth As a result of the breach, on behalf of Gesa, Marquis began mailing data breach notification letters to impacted individuals. Based on the breach notice sent to Washington residents, Gesa and Marquis are providing affected individuals with a list of the specific types of sensitive information impacted and complimentary credit monitoring services. A link to the breach

Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the Gesa Credit Union data breach. If you were affected by the data breach, your sensitive personally identifiable information may have been exposed, and you may be eligible for compensation. About Gesa Credit Union Gesa Credit Union is a not-for-profit financial cooperative that began in 1953 in Richland, Washington. Originally serving administrative employees at the Hanford site, Gesa has grown into one of the largest credit unions in Washington state, now serving more than 260,000 members. The credit union expanded rapidly after 1996 when it became a community-chartered institution, opening membership to anyone in Washington. Today, Gesa operates dozens of branches across Washington, Oregon and Idaho, with a focus on community engagement and financial education. Gesa is known for its commitment to giving back, including millions in community contributions and scholarship programs. Despite its growth, Gesa continues to emphasize its cooperative roots and focus on member benefits. What Happened? In August 2025, Gesa Credit Union learned of a data security incident involving Marquis Software Solutions, a former marketing and communications vendor. Marquis detected suspicious activity on its network on Aug. 14, 2025, and determined that an unauthorized third party had accessed and acquired certain files from its systems. Marquis’ investigation r