Third Defendant Surfaces in Futu and Tiger Insider Trading Case

A third defendant has voluntarily appeared in a high-profile U.S. insider trading case involving Futu Holdings (FUTU) and UP Fintech Holding (TIGR), commonly known as Tiger Brokers. The legal proceedings, centered in the U.S. District Court for the Southern District of New York, involve allegations of illicit gains through short put options timing. The defendant, a 32-year-old individual from mainland China, came forward in an attempt to unfreeze assets previously restricted by court order.

Suspicious Activity and Market Maker Litigation

The legal dispute originated when prominent options market makers, including Susquehanna International and Citadel Securities, filed a lawsuit against several unidentified traders. The plaintiffs allege that highly specific trading patterns emerged between May 7 and May 21, 2026. During this window, substantial short put option positions were established through multiple brokerage platforms, including Interactive Brokers, Futu, and Tiger Brokers.

• The trades coincided with a major acquisition offer for a Hong Kong-listed company.
• Court documents suggest the timing of the options positions highly overlapped with non-public information regarding the deal.
• The Southern District of New York previously ordered an immediate freeze on accounts linked to these specific transactions.

Asset Freezes and Regulatory Implications

The appearance of the third defendant marks a significant development in the efforts by U.S. authorities to identify the beneficial owners behind the anonymous accounts. While the case primarily involves traditional equities and derivatives, it highlights the increasing scrutiny on cross-border financial flows and the use of retail-focused fintech platforms for large-scale institutional-grade maneuvers. Short put options are a strategy where a trader sells the right to sell a stock at a certain price, profiting if the stock price remains stable or increases.

The court's decision to freeze the assets was a preemptive measure to ensure that potential illicit profits are not moved beyond the reach of U.S. jurisdiction. This case reflects a broader trend of rigorous oversight by regulators and market makers to maintain the integrity of derivatives markets, which are increasingly accessible to international traders through digital brokerage firms.

As the legal process continues, the involvement of high-net-worth individuals from mainland China utilizing U.S.-listed brokers like Futu and Tiger underscores the complexities of international financial regulation. The outcome of this case may set a precedent for how U.S. courts handle insider trading allegations involving foreign nationals using domestic trading infrastructure.