Such enticements are now becoming part of a growing array of expensive tools the world’s biggest hedge funds are deploying to hire and retain traders.

Musk and the 74-year-old Frenchman have been neck-and-neck for the top spot this year in the Bloomberg Billionaires Index, a listing of the world’s 500 richest people.

This increased restriction was especially pronounced in funds using nonequity strategies, according to the study.

JPMorgan Chase, Goldman Sachs Group and Morgan Stanley are among those hawking the products, which are known by the deceptively dreary name “quantitative investment strategies,” or QIS.

John Walters has immersed himself in the tax world for nearly four decades, but only in the past few months did he expand his work into something else, as one of the newest multi-family office directors with Financial Gravity.

A British native now based in the US, Flacks is looking to ramp up his investments after acquiring four businesses in the same number of years. Those alone are currently worth more than $250 million, according to data compiled by Bloomberg.