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Jun 30, 2026

Trading Giant Susquehanna Lost Over $70 Million To Mystery Insider Traders


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Trading giant Susquehanna Investment Group said it was attempting to unmask the identities of individuals it claims made at least $100 million trading on inside information about a Chinese government crackdown on cross-border brokerages last month.

The Pennsylvania-based market-maker, which says it was the counterparty on most of the alleged insider trades, sued 100 John Doe defendants in Manhattan federal court on Monday. Susquehanna is seeking to recover more than $70 million it says it lost to what it believes is one of the largest insider-trading schemes in recent memory, Bloomberg reported.

While it’s unusual for a major Wall Street firm to sue as a victim of insider trading - which is normally policed by the Securities and Exchange Commission and federal prosecutors - in suing the dozens of unknown traders, aka "John Does", Susquehanna is using a tactic sometimes employed by the SEC to seek information it hopes will identify the alleged insider traders.

According to Susquehanna, many of the trades were made from accounts at Interactive Brokers Group Inc., as well as the platforms of two firms targeted in the Chinese crackdown, Futu Holdings and Up Fintech’s Tiger Brokers (we discussed this in May in "China Launches Crackdown On Cross-Border Stock Selling To Block Capital Outflows").

Susquehanna is seeking an order freezing certain accounts at those brokerages and authorizing subpoenas of them.

Susquehanna, which is one of the largest US market-makers and is active in options, stocks, energy, bonds and foreign exchange markets, said in an SEC filing that its equity positions in the first quarter totaled more than $893 billion. The closely held company based in the Philadelphia suburbs has made its co-founder Jeff Yass one of the richest people in the world with a fortune estimated at $92 billion, according to the Bloomberg Billionaires Index.

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