By Rebecca Christie and Vincent Del Giudice Nov. 7 (Bloomberg) -- The U.S. Treasury opened a probe to identify any improper trading by investors in the 2 percent two- year-note maturing Sept. 30, 2010 and the 3 1/8 percent five- year note maturing Sept. 30, 2013. ``Entities with reportable positions in either of these notes equal to or exceeding the $2 billion threshold must submit a separate report for the security to the Federal Reserve Bank of New York'' before noon on Nov. 14, the Treasury said today in a statement released in Washington. The confidential reports are for positions held on Nov. 6 at the close of business. The CUSIP, or identification, number on the two-notes is 912828 JL 5, and the CUSIP number for the five-year notes is 912828 JM 3. The large position reporting program, established in 1996 in the aftermath of the Salomon Brothers bond market scandal, is aimed at guarding against market manipulation. To contact the reporters on this story: Rebecca Christie in Washington at Rchristie4@bloomberg.net; Vincent Del Giudice in Washington vdelgiudice@bloomberg.net.

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