Key facts
- Two U.S. options market makers, Susquehanna International Group and Citadel Securities, have narrowed an insider-trading lawsuit.
Two major U.S. options market makers have narrowed an insider-trading lawsuit to 45 individuals, alleging they made $155 million in illicit profits using leaked Chinese regulatory information. The case involves Chinese online brokerages Futu Holdings and Tiger Brokers.

The lawsuit highlights ongoing concerns about potential cross-border market manipulation and the use of non-public information in financial markets, impacting investor confidence in Chinese online brokerages.
Two major U.S. options market makers, Susquehanna International Group (SIG) and Citadel Securities, have narrowed an insider-trading lawsuit to 45 individuals. The lawsuit alleges these individuals used leaked Chinese regulatory information to illicitly profit $155 million. The case originated on June 29 when SIG sued unidentified traders in Manhattan federal court, claiming they reaped over $100 million in illegal gains. The core of the legal action involves put-option trades executed shortly before Chinese regulators announced penalties against online brokerages Futu Holdings Ltd. and UP Fintech Holding Ltd. (Tiger Brokers) on May 22. These penalties were for unauthorized cross-border operations, highlighting ongoing concerns about potential cross-border market manipulation.