(Bloomberg) -- Palantir Technologies Inc., one of Silicon Valley’s most highly valued private companies, has struggled to retain employees and prominent customers, according to a report by BuzzFeed.

In 2015, Palantir generated $420 million in revenue, BuzzFeed reported, citing interviews with former and current employees, as well as more than 1,000 internal e-mails and documents. The secretive big data company spent more than $500 million last year, the report said. A spokeswoman didn’t immediately respond to a request for comment.

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