The regulator says that the high-frequency trading giant has made $4.3 billion from India in a little over two years, and so far its officers have only investigated trades in one index

SEBI has banned the firm from India’s securities markets. The drama has thrown a bright light on Jane Street, a company of legendary opacity even in an industry that prioritises secrecy. And it could carry political and regulatory consequences, not just for Jane Street, but for an entire, ascendant industry of marketmakers.

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