The SEC sued Elon Musk in federal court on Tuesday for allegedly misleading shareholders when he bought hundreds of millions of dollars worth of Twitter stock in 2022.

Elon Musk is being sued by the U.S. Securities and Exchange Commission over his 2022 Twitter takeover. The agency alleges that the billionaire failed to disclose his ownership of Twitter stock in a timely manner, saving himself at least $150 million “at the expense of shareholders.”