US Tiger Securities Data Breach Exposes Sensitive Customer Information Between July 8 and 9, 2025, US Tiger Securities operating as Tiger Brokers suffered a cybersecurity breach in its virtual back-office environment, which also supports its affiliate, TradeUP. An unauthorized third party encrypted files and exfiltrated data before the intrusion was detected on July 10, 2025. After a lengthy investigation concluded on April 17, 2026, the firm began notifying affected individuals. Compromised data includes names, Social Security numbers, driver’s license and government-issued ID numbers, medical records, and health insurance details. The breach impacts customers of both US Tiger Securities and TradeUP. Legal professionals are now reviewing the incident to determine whether a class action lawsuit can be filed on behalf of those affected. The case could seek compensation for privacy violations, financial losses, and other damages resulting from the breach. US Tiger Securities has not disclosed the total number of individuals impacted.