From the Wall Street Journal via MSN, June 19:
Mystery has long shrouded Jane Street, the Wall Street trading giant. Its traders rely on proprietary algorithms, making it hard to understand how the firm generates all its profits. It’s privately owned and only trades with its own money, so its moves are difficult to track. It’s also an unusually flat organization, with no one leader at its helm to speak on business television or serve as its public face.
The firm’s location adds to its enigma. Jane Street occupies a nondescript office building in Brookfield Place across from the World Trade Center, rather than the Greenwich Village street it randomly picked for its name.
Now, as the firm pushes to become an artificial-intelligence powerhouse, it’s edging into the spotlight.
Jane Street has surged in size from a handful of staffers when it was founded 26 years ago to 3,500 employees, and it wants to get much bigger, with plans to recruit more than 500 employees this year. To become a major AI investor and supercharge its trading with the technology, it needs to catch the attention of AI startups and talent.
Jane Street executives say they never set out to build a secretive firm. Rather, many of them are engineers, mathematicians and others who are naturally uncomfortable in the public eye.
“We are culturally insular,” said John Daniel Case, a Jane Street trader who works on AI investments, during a rare interview at the firm’s headquarters. “But we’re expanding to businesses that are more public-facing.”
The firm’s culture is on display across its 40,000-square-foot trading floor, where young staffers—mostly male—sit at their desks in T-shirts, some in shorts and flip flops. Throughout the day, the lighting changes color to match the circadian rhythms of its traders: amber in the morning, blue-white at midday and an amber glow late in the day.
During breaks, employees play videogames or poker, a nod to geeky math culture the firm has embraced. Among the few well-known details about Jane Street: the famously complicated puzzles and problems it gives job candidates.
Staying out of the spotlight has gotten a lot harder as Jane Street has grown, with its profits now topping those of Goldman Sachs and Morgan Stanley, helped in part by gains from investments in Anthropic and other private companies. Its activities are increasingly drawing scrutiny, too, including accusations of market manipulation.
Jane Street is leaning in to its wonky image to attract new recruits, portraying itself as more akin to a college math department than a hedge fund.
In a recent ad on the Dwarkesh Podcast, an influential tech show, host Dwarkesh Patel said Jane Street offered employees courses and lectures, and that its apprenticeship model produces “some of the most competent researchers and engineers in the world.”
“If you’d like to work for a place like this, Jane Street is hiring,” Patel said.
The firm also wants to get the word out about its AI investments and deals for computing power, eager to let AI companies know that it’s eager to make new investments—and wants to be a partner for their businesses.
The shift is catching some by surprise. In April, Jane Street cut a deal to invest $1 billion in AI computing company CoreWeave and spend $6 billion to use its AI cloud platform. After inking the transaction, the firm asked CoreWeave to publicize the deal in a press release.
“We said, ‘Wait, what?’ ” says Brannin McBee, a CoreWeave co-founder who was familiar with Jane Street’s penchant for secrecy. He said it was a smart way to signal to job candidates that the firm would have ample computing power for their AI work
Like many quant firms, Jane Street has long relied on machine learning, a form of artificial intelligence, to build the trading models that dictate its moves. But it accelerated its focus on AI after the release of ChatGPT in late 2022, which set off the AI revolution.
Jane Street now has a portfolio of private companies worth $20 billion. That figure includes a stake in Anthropic that was purchased in 2024 from the estate of FTX. The bankrupt crypto exchange’s founder, Sam Bankman-Fried, is one of Jane Street’s most famous alums and worked at the firm from 2014 to 2017, roaming the office in a hoodie and no shoes....
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