The U.S. Securities and Exchange Commission is investigating alleged insider trading that Susquehanna International Group says was tied to options bets made before a recent Chinese regulatory crackdown on cross-border brokerages. Bloomberg and the Financial Post both report that, according to a person familiar with the matter, the SEC is examining allegations involving unknown traders who are said to have earned about $100 million through options positions ahead of the Chinese move. The reports do not name the individuals or firms involved, and the SEC’s inquiry is described as based on Susquehanna’s allegations. The Chinese regulatory crackdown referenced in the reports relates to restrictions affecting cross-border brokerage activity. Both outlets present the $100 million figure as coming from Susquehanna’s claims rather than as a confirmed SEC finding. The companies and regulators involved have not publicly provided additional details in the cited summaries, including timing of the trades, the specific options strategies used, or the identities of the alleged traders. The investigation remains at the fact-finding stage as described by the sources.