Chiarella v. United States, 445 U.S. 222 (1980), is a case in which the Supreme Court of the United States held that an employee of a printer handling corporate takeover bids who deduced target companies' identities and dealt in their stock without disclosing his knowledge of impending takeovers, had not violated § 10(b) of the Securities Exchange Act of 1934 and SEC Rule 10b-5.