Jane Street, a New York-based trading firm, has emerged as a significant force in financial markets, driven by its dominance in exchange-traded funds (ETFs) and its willingness to trade more complex financial securities. In 2023, the firm generated over $10 billion in net trading revenues for the fourth consecutive year, with gross trading revenues reaching $21.9 billion, which is roughly one-seventh of the combined trading revenues of all major global investment banks. Larry Tabb, a Bloomberg Intelligence analyst, described their profits as "obscene," stemming from their engagement with instruments others avoid, which also carries higher risks.

The firm's growth continued into the first half of 2024, with net trading revenues increasing by 78% year-on-year to $8.4 billion. If this pace continues, Jane Street could surpass Goldman Sachs's market-making revenues for the year. With a reported profit margin of 70% in investor documents, Jane Street is projected to outperform major asset managers like Blackstone and BlackRock. Its success is particularly notable in the bond market, an area historically dominated by banks, where it has rapidly established a strong presence.

Jane Street, founded in 2000, initially focused on American Depositary Receipts before specializing in ETFs. It now accounts for 14% of all U.S. ETF trading and 20% of European trading, and an estimated 41% of bond ETF creation and redemption transactions. This makes it a crucial "authorized participant" in the ETF ecosystem. The firm employed 2,631 people at the end of 2023, generating nearly $4 million in net revenue per employee. While its rapid growth has led to increased scrutiny, competition from banks and firms like Citadel Securities is intensifying, particularly in fixed income.