''The number I saw in the paper is not one that I have heard," Spitzer said after speaking to the Federal Law Enforcement Foundation in Manhattan. ''There has been no discussion about a number. It is very premature."
A Marsh spokesman didn't respond to a request for comment.
''We will do the calculation and it could be far higher than the $500 million," Spitzer said.
Shares of Marsh & McLennan rose 2 cents to $28.71 in trading yesterday afternoon on the New York Stock Exchange.
Separately, Allstate Corp., the second-largest US home and auto insurer, yesterday said it received a subpoena from the Connecticut state attorney general's office seeking information on alleged bid-rigging in the industry.
Allstate said Connecticut Attorney General Richard Blumenthal is seeking information about how it prices insurance products as part of a wider investigation that has already seen some 34 other insurers receive similar requests.
Also yesterday, Fitch Ratings downgraded Marsh & McLennan debt to BBB from A-minus and kept the company on its ''rating watch negative" list for possible further downgrades.