Thomson Financial, a unit of Toronto-based Thomson Corp., said it had received a subpoena from the U.S. stocks regulator for documents on the operations of its Capital Markets Intelligence business.

"Thomson Financial is co-operating fully with the SEC and has been informed that the inquiry should not be construed as an indication by the commission or its staff that any violation of law has occurred," the company said in a statement.

The Capital Markets Intelligence business collects stock ownership information for publicly traded companies who want to know the identity of their institutional shareholders. In 2003, about $33 million of Thomson Financial's markets intelligence revenues came from identifiying institutional investors.

Thomson Financial generates revenues of $1.5 billion a year by providing information and technology to the global financial community. The company is part of Thomson Corp., which had revenues of $7.44 billion last year and sells specialized information to lawyers, accountants, the financial, education and other sectors.

In trading Monday morning on the New York Stock Exchange, Thomson Corp. shares were up 1 cent at $34.40 - toward the middle of their 52-week range of $29.84 to $37.29.