A New York judge has issued a temporary restraining order restricting the transfer of Facebook Inc.'s assets, following a suit by a New York man who claims to own an 84% stake in the social-networking company.

Paul D. Ceglia filed a suit in the Supreme Court of New York's Allegany County on June 30, claiming that a 2003 contract he signed with Facebook founder and Chief Executive Mark Zuckerberg entitles him to ownership of the company and monetary damages.

The...