Billionaire Paul Tudor Jones dismissed about 15 percent of the workforce in a shakeup at his hedge fund that’s reeling from more than $2 billion in investor withdrawals this year.

Tudor Investment Corp., which oversees $11 billion and employs about 400 people, earlier Tuesday informed the affected employees, which include positions ranging from money managers to support staff, three people with knowledge of the matter said. The firm got redemption notices for $400 million this quarter, according to another person, after being hit with $1.7 billion in withdrawals in the first half.

The cuts at Tudor, one of the oldest and most expensive hedge funds, shows the upheaval in the industry is engulfing even the most renowned firms, as large investors sour on the high-fee managers. Tudor, founded in 1980, trimmed fees this year after lackluster returns, while some long-time money managers have left. Jones has in the past year accelerated a revamp of the firm using quantitative tools.

“Amid a changing operating environment, we have made strategic adjustments to our firm’s staffing,” Tudor said in a statement, which didn’t specify how many jobs are being cut. “These difficult changes were made after conducting a deep and broad review of our business and are meant to optimally size the firm for future success. We are committed to treating our departing employees with care and support and appreciate their many contributions to Tudor.”

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The current job cuts are focused on money managers that had posted losses or failed to post profits, said the people who asked not to be identified because the firm is private. Tudor, which is based in Greenwich, Connecticut, and has offices in cities including Singapore and London, is reducing headcount globally, they said. The firm employed 409 people, about half in investing roles, according to the latest regulatory filing.

Tudor has hired scientists and mathematicians, some with doctorates, to help money managers with trading. Jones has told colleagues that his firm needs to get up to speed with newer technologies as quant funds post robust profits, the people said.