Tradier notifies customers of data exposure at brokerage software vendor

Tradier Brokerage has begun emailing customers about a breach at Etna Software Corporation, which supplies its order management system and pre-trade controls. A notice published by KuCoin says regulatory filings identify 9,404 affected Texas residents and 1,580 Massachusetts residents. The attack occurred on August 28, 2026, and Tradier said it learned of it on September 3. Potentially accessed information includes names, addresses, phone numbers, Social Security numbers and government-issued tax identification numbers. Tradier says its internal network was not compromised. Affected customers can receive up to two years of credit monitoring and identity theft protection, with enrollment required within 90 days of receiving their notification.