By Peter Schroeder and Brendan Sasso - 06/27/12 06:50 PM EDT
The regulator also charges that Falcone and his fund gave certain clients secret, favorable treatment and also participated in illegal trades tied to three public offerings of stock.
Falcone, through his lawyer, has contested any charges of impropriety.
“Any allegations by the SEC of improprieties by Mr. Falcone or Harbinger are neither supported by the facts or the law,” Matthew Dontzin, an attorney for Falcone, told Bloomberg. “Should a lawsuit be brought, it will be contested vigorously.”
Beyond the SEC charges, Falcone's business activity has also garnered the attention of Congress, via the high-profile failure of the wireless broadband company LightSquared.
Falcone invested billions of dollars in LightSquared, which planned to build a nationwide high-speed cellular network. But the company was forced to file for bankruptcy last month after the Federal Communications Commission (FCC) moved to block its network over concerns that it would interfere with GPS devices.
Some Republicans have questioned why the FCC allowed LightSquared to get as far as it did in the regulatory process despite evidence of the interference problem. They have suggested the company and Falcone may have benefited from political connections at the FCC and the White House.
Republicans on the House Energy and Commerce Committee have launched an investigation into the FCC's review of LightSquared.
Falcone, who has donated thousands of dollars to both Democrats and Republicans in recent years, says he is a registered Republican and has denied any attempts to influence the process through political connections.