WASHINGTON -- Federal regulators have charged Dallas Mavericks owner Mark Cuban with insider trading for allegedly using confidential information on a stock sale to avoid more than $750,000 in losses.

The Securities and Exchange Commission filed a civil lawsuit against Cuban on Monday in federal court in Dallas. The agency says that in June 2004, Cuban was invited to get in on the coming stock offering by Mamma.com Inc. after he agreed to keep the information private.

The SEC says Cuban knew the shares would be sold below the current market price, and a few hours after receiving the information, told his broker to sell all shares in the search engine company.

"As we allege in the complaint, Mamma.com entrusted Mr. Cuban with nonpublic information after he promised to keep the information confidential. Less than four hours later, Mr. Cuban betrayed that trust by placing an order to sell all of his shares," Scott W. Friestad, deputy director of the SEC's Division of Enforcement, said in a statement. "It is fundamentally unfair for someone to use access to nonpublic information to improperly gain an edge on the market."