WASHINGTON -Federal Reserve Chairman Alan Greenspan's personal financial holdings were valued between $3.1 million and $9.6 million at the end of last year, according to a federal financial disclosure report released Aug. 7. The Fed chairman also held between $650,000 and $1.5 million worth of Treasury bills in direct deposit accounts. He held assets in four money market accounts and savings and checking accounts at the Federal Reserve's credit union, according to the report. He reported no holdings of stocks. The bulk of Greenspan's assets, between $2.25 million and $7.5 million,was held in an individual retirement account at CIBC Oppenheimer Corp. invested entirely in U.S. Treasury bills.