Sidley Austin LLP Reports Data Incident to Illinois Attorney General

Sidley Austin LLP, a prominent global law firm, has formally reported a data security incident to the Illinois Attorney General. This filing, submitted on April 28, 2026, confirms that the firm's systems were involved in an unauthorized security event.

The public record indicates that this incident involved personal information, though the specific types of data exposed or the nature of the security breach itself are not detailed in the official filing. As a firm managing complex legal and corporate matters, Sidley Austin LLP routinely handles various forms of client and operational data.

If you have received a direct notification letter from Sidley Austin LLP regarding this incident, it signifies that your personal information was potentially accessed or acquired by an unauthorized party. This letter will provide the most specific information available to you regarding the scope and impact of this event.

We recommend carefully reviewing any official communication from the firm. As a general safeguard, consider monitoring your accounts for unusual activity and remaining vigilant against unexpected communications. Such actions can help detect potential misuse of your information.

This information is derived from official regulatory filings made with the Illinois Attorney General's office, serving as a public record of the reported security incident.