WeWork Companies Inc., the rapidly growing shared-office-space provider, has raised $400 million of capital from Fidelity Management & Research Co. in a deal that values it at $10 billion, the company said Wednesday.

The deal is the latest signpost of the company's stunning growth and investors' growing appetite for rapidly expanding private companies. Formed in 2010 in a small office in New York, WeWork was valued at $5 billion six months ago. In early 2014 it was valued at about $1.5 billion.

The money from Fidelity was unsolicited, said Adam Neumann, WeWork's chief executive, in an interview Wednesday.

"We didn't seek this out," said Mr. Neumann. "We kept having offers and kept ignoring them," he added, saying that eventually he changed his mind and struck the deal with Fidelity.

The company's main business is renting office space from landlords and dividing it up into incubator-like spaces with small offices and hip common areas meant to promote interaction.

Bloomberg News reported earlier Wednesday that WeWork was seeking funds at a $10 billion valuation.

Write to Eliot Brown at eliot.brown@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Slack Technologies (NYSE:WORK)
Historical Stock Chart
From Jun 2024 to Jul 2024 Click Here for more Slack Technologies Charts.
Slack Technologies (NYSE:WORK)
Historical Stock Chart
From Jul 2023 to Jul 2024 Click Here for more Slack Technologies Charts.