Palantir Technologies CEO Alex Karp

Palantir Technologies, the secretive Silicon Valley data analysis firm co-founded by Peter Thiel, has lost a marquee cybersecurity client, BuzzFeed News has learned, continuing a string of defections by corporate customers.

Home Depot, which hired Palantir after its major credit card hack in 2014, ended the relationship in December over concerns that Palantir's services weren't worth the price, according to two people familiar with the matter who spoke on the condition of anonymity. The retailer concluded that it could accomplish much of the same work on its own, one of the people said.