A good start, but this only covers a few companies...
http://www.guardian.co.uk/business/feedarticle/7826673
SEC orders hedge funds, broker-dealers to give dataReuters, Thursday September 25 2008 (Adds details, background)
WASHINGTON, Sept 25 (Reuters) - U.S. securities regulators have ordered more than two dozen hedge funds, broker-dealers and institutional investors to hand over information about their trading in certain financial institutions, a source briefed on the matter said on Thursday.
Late last week, the Securities and Exchange Commission said it was expanding its ongoing probe into possible market manipulation in certain financial companies' securities. The SEC did not name the companies.
But the agency said hedge fund managers, broker-dealers and big investors with significant trading activity in financial firms or positions in credit default swaps would be required to disclose those positions to the SEC and provide other information.
The SEC has taken several steps to crack down on market manipulation and rumor mongering, which has been blamed for the demise of big investment banks Bear Stearns and Lehman Brothers.
Mid-July, the agency and examiners from the New York Stock Exchange Regulation and the Financial Industry Regulatory Authority increased efforts to ensure that broker-dealers and investment advisers have controls in place to prevent the intentional creation or spreading of false information. (Reporting by Rachelle Younglai; Editing by Brian Moss and Gerald E. McCormick)