突发！量化巨头割韭菜！强平+禁入市场

Core Viewpoint - The Indian regulatory authority has banned the American quantitative trading giant Jane Street from entering the local securities market due to allegations of stock index manipulation, resulting in the seizure of $567 million in funds [2][3][5]. Group 1: Regulatory Actions - On July 4, the Securities and Exchange Board of India (SEBI) issued a temporary order prohibiting Jane Street from participating in the Indian securities market until further notice [3][5]. - SEBI has confiscated ₹48.4 billion (approximately $567 million) from Jane Street, labeling it as "illegal gains" from alleged misconduct [8][11]. - Jane Street and its related entities are restricted from directly or indirectly trading securities, with the ban remaining in effect until the investigation concludes [8][10]. Group 2: Allegations of Market Manipulation - SEBI's investigation revealed that Jane Street employed manipulative trading strategies that resulted in losses for retail investors on the opposite side of the trades [7][14]. - The firm allegedly influenced the prices of futures and spot markets by using significant capital on weekly index options expiration days, which had relatively low trading volumes [13][14]. - An example cited by SEBI involved Jane Street aggressively buying ₹43.7 billion (approximately $5.12 billion) worth of NSE Nifty Bank index stocks and futures, subsequently selling off these positions to drive down prices [13][14]. Group 3: Impact on the Trading Landscape - The ban on Jane Street is seen as a significant blow to the firm, which reportedly earned around $4.3 billion from Indian trading activities between January 2023 and March 2025 [11]. - The action taken by SEBI sends a clear message to global high-frequency trading firms that unfair practices will not be tolerated in the Indian market [14].