The jury in federal district court in Dallas said that the Securities and Exchange Commission failed to prove the key elements of its case, including the claim that Cuban agreed to keep certain information confidential and not trade on it.
The nine-member jury deliberated only a few hours before reaching the verdict that ended a three-week trial and an SEC lawsuit filed in 2008.
Cuban, 55, hugged his lawyers after the verdict, then called family members. During an impromptu news conference outside the courthouse, he angrily denounced the SEC and its lead trial attorney, Jan Folena, saying that they lied about the evidence and targeted him because of his fame. He said that defendants of lesser wealth could have been bullied.
"Hopefully people will start paying attention to how the SEC does business," Cuban said. "I'm the luckiest guy in the world. I'm glad this happened to me. I'm glad I'm able to be the person who can afford to stand up to them."
Folena, who left the courthouse just minutes before Cuban, said, "We believe we did the best we could in this case, and things turn out the way they turn out."
The SEC accused Cuban of using inside information to sell $7.
The company's CEO testified by video that Cuban, the largest shareholder, agreed during an eight-minute phone call that he wouldn't disclose what the CEO told him about the stock offering or sell his shares on the news. He sold them a few hours later, however, before the company announced the stock offering to the public. Cuban disputed the CEO's claims.
"This was a credibility contest and Cuban won," said John Coffee, a law professor at Columbia University. Cuban's lawyers attacked the credibility of the CEO, Guy Faure, and Coffee said the SEC failed to produce evidence to support Faure's account of the phone call, which was not recorded. The verdict, he said, "tells the SEC to stay away from he-said, she-said cases."
Jeffrey Ansley, a former SEC enforcement lawyer now in private practice in Dallas, said the jury's fast verdict was a condemnation of the SEC's case.
"The SEC lost every place where they could have lost, and because of that, this has to impact how the SEC staff decides which cases to bring," Ansley said. He said the agency may become gun-shy about challenging people with the means to mount an aggressive defense, as Cuban did.
SEC spokesman John Nester said the verdict "will not deter us from bringing and trying cases where we believe defendants have violated the federal securities laws."
The jury seemed to foreshadow its decision when it chose as its leader a woman who said that she had served on another jury that acquitted a defendant charged with fraud. She gave no other details of the case.
The SEC sued Cuban in 2008. U.S. District Judge Sidney Fitzwater dismissed the lawsuit in 2009, but his ruling was overturned by an appeals court, which sent the case back to Fitzwater for the trial that ended Wednesday.
Sports Illustrated lists Cuban among the 50 most powerful people in sports. He built the hapless Mavericks into an NBA champion, along the way building a reputation for berating referees. The NBA has fined him at least $1.5 million for his comments.
Forbes magazine estimates Cuban's wealth at $2.5 billion. If the jury had ruled for the SEC, Cuban could have faced roughly $2 million to $3 million in fines and penalties. On Wednesday, Cuban said he spent much more than that on the lawyers who delivered him a victory in the courtroom.