Rob Granieri: the mysterious billionaire boss of Jane Street

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Rob Granieri is “the last founder standing” at Jane Street – “the black-box money machine” currently “minting Wall Street records”, says Bloomberg. But he’s almost impossible to pin down – guarding his “low-key stature” so tightly that he often goes unrecognised, even in his own company, where he officially has no title. His profile in the employee directory stands out for its missing headshot.

If you want a sighting of the “schlubby” billionaire recluse, you’re better off looking beyond Wall Street. The “soft-spoken libertarian” is most at home at alternative gatherings: notably that “mecca of counterculture”, the Burning Man festival. Another favoured haunt is the Scarlet Pearl casino in Mississippi’s Biloxi Bay – a family affair he helped build and finance.

Still, “invisibility has grown harder to maintain” as Jane Street’s profits have exploded, says the New York Post. The firm, which some have dubbed the world’s most lucrative trading house, has enjoyed such breakneck growth over the past five years – at the vanguard of the exchange-traded fund boom – that it accounted “for nearly a quarter of all US-listed ETF trading volume last year”. “The amount of money they make is almost obscene,” one former analyst told the Financial Times, which describes the “quirky and opaque” outfit, renowned for spotting arbitrage opportunities, as one of the “new titans of Wall Street” – frequently trouncing establishment rivals. Jane Street’s $21.9 billion trading revenues in 2023 were “equivalent to roughly one-seventh of the combined equity, bond, currency and commodity trading revenues of all the dozen major global investment banks”. The arrival of bitcoin ETFs the following year put another rocket under revenues. As of June this year, it had already pulled in $17 billion.

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Granieri, now 53, always “harboured ambitions to make a lot of money”, says Bloomberg. After graduation in 1992, he printed a stack of CVs and dropped them off on each floor of Philadelphia’s tallest buildings. The strategy worked. He scored a job at Jeff Yass’s Susquehanna International Group, “the quant-trading firm that was quietly becoming a market behemoth,” and was soon pulling in $700,000 a year. But, itching for change, he teamed up with two other traders to form the firm that became Jane Street in 1999.

Rob Granieri: into the limelight

Being dragged into the limelight by success is one thing. Sadly for Granieri, Jane Street is increasingly under scrutiny for other reasons, too. Most serious, says Bloomberg, is an accusation by the Indian regulator of “rigging the world’s largest options market”, which the firm has vowed to fight. The collapse of Sam Bankman-Fried’s FTX crypto exchange, and subsequent high-profile fraud trial, also shone unwelcome light on the firm’s culture – “SBF” spent his early career there, personally recruited by Granieri. “Having Jane Street on the CV was a crucial bit of Bankman-Fried’s sales pitch,” notes the FT. Yet the lax office vibe at FTX was a partial mirror of Jane Street’s, where Granieri “has inculcated a culture that mirrors his quirks”, says the New York Post.

The wider worry, says the FT, is that Jane Street’s “tight-knit” corporate culture no longer fits its size and global clout. The firm is run by roughly 40 equity partners with no traditional management structure: a recipe for a lack of accountability, say critics. Much depends on the outcome of the Indian investigation. The worse-case scenario for the firm is that “the temporary block on activities” imposed there could spread to other jurisdictions as regulators dig deeper. One of Granieri’s few personal indulgences is fine dining. Why cook, he jokes, when you can “eat at Le Bernardin every night”? Given his woes, he could be forgiven a spot of comfort eating.

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Jane writes profiles for MoneyWeek and is city editor of The Week. A former British Society of Magazine Editors editor of the year, she cut her teeth in journalism editing The Daily Telegraph’s Letters page and writing gossip for the London Evening Standard – while contributing to a kaleidoscopic range of business magazines including Personnel Today, Edge, Microscope, Computing, PC Business World, and Business & Finance.

She has edited corporate publications for accountants BDO, business psychologists YSC Consulting, and the law firm Stephenson Harwood – also enjoying a stint as a researcher for the due diligence department of a global risk advisory firm.

Her sole book to date, Stay or Go? (2016), rehearsed the arguments on both sides of the EU referendum.

She lives in north London, has a degree in modern history from Trinity College, Oxford, and is currently learning to play the drums.