SAN FRANCISCO — Palantir Technologies, a Silicon Valley data start-up, said on Monday that it had filed to go public, setting up one of the largest public listings of a technology start-up since Uber made its debut last year.
Palantir is one of the tech industry’s most valuable private companies, with a valuation of $20 billion. Founded in 2003 by Peter Thiel, Joe Lonsdale, Nathan Gettings, Steven Cohen and Alex Karp, who is its chief executive, the company began working with governments, law enforcement and the defense industry to analyze and process their data, but has expanded into other areas.
Palantir has attracted more than $3 billion in venture capital funding from investors including In-Q-Tel, the investment arm of the Central Intelligence Agency; Founders Fund, Mr. Thiel’s investment firm; Fidelity; and Tiger Global Management.
Despite persistent speculation about its prospects as a public company, Palantir had avoided listing its shares, in part because of the secretive nature of its business. A public listing would reveal a fuller picture of Palantir’s work, particularly with government agencies, for the first time.