突发！量化巨头割韭菜！强平+禁入市场

Core Viewpoint - Jane Street, a major US quantitative trading firm, has been banned from the Indian securities market by the Securities and Exchange Board of India (SEBI) due to allegations of manipulating stock indices and has had $567 million seized as a result of its actions [2][5][8]. Group 1: Regulatory Actions - On July 4, SEBI issued a ban on Jane Street and its related entities from participating in the Indian securities market until further notice [2][5]. - SEBI's interim order, issued on July 3, is described as one of the strictest actions taken against foreign trading firms in India [3]. - The ban includes a requirement for Jane Street to deposit the seized funds into a custodial account and prohibits any debit operations without regulatory permission [5][10]. Group 2: Allegations of Market Manipulation - SEBI claims that Jane Street employed manipulative trading strategies that resulted in significant losses for retail investors [5][11]. - The firm allegedly influenced the prices of futures and spot markets on weekly index options expiration days, allowing it to build larger and more profitable positions [10][11]. - An example cited by SEBI involved Jane Street buying ₹43.7 billion (approximately $512 million) worth of NSE Nifty bank index stocks and futures in a "aggressive" manner, which subsequently inflated prices [10]. Group 3: Financial Impact - Since commencing operations in India in December 2020, Jane Street reportedly made approximately $4.3 billion in profits from its trading activities in the country from January 2023 to March 2025 [8]. - SEBI's actions are expected to send a strong message to global high-frequency trading firms regarding compliance with fair trading practices in India [11].