Jane Street approximately earned 40 billion USD in 2025, with about 3,500 employees, nearly double compared to the previous year.

Assuming a profit margin of 65%-70%, that’s an average profit of 8 million USD per person.
Among companies with over 1,000 employees, this might be the highest level.
High-frequency trading remains the most efficient money-printing machine.
In 2014, Jane Street became famous for recruiting top math, physics, and computer science competition champions from elite universities, then having them go through multiple rounds of interviews.
Trading positions are especially tough, requiring them to go through a set of mental calculation hell.
Some of the legendary interview questions include:
Starting from today, in DD/MM/YYYY format, what is the next date where all digits are unique?
No pen, no tools allowed.
Most of those selected are probably math geniuses.
Truly impressive.
Other companies with similar profit efficiency include these:
1/ Profit basis
Tether: per capita profit over 90 million USD
Hyperliquid: per capita profit over 80 million USD
2/ Revenue basis
Valve: per capita revenue of 50 million USD
OnlyFans: per capita revenue of 37 million USD
Craigslist: per capita revenue of 14 million USD
Anthropic: per capita revenue of 12 million USD, based on run rate
OpenAI: per capita revenue of 8 million USD, based on run rate
Compared to these, Nvidia is already a highly efficient large-scale company, with a per capita revenue of 4.4 million USD.