MMC INVESTOR DAY TO BE HELD ON DECEMBER 7, 2006

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NEW YORK, NEW YORK, September 19, 2006 — Marsh & McLennan Companies, Inc. (MMC) announced today that it will hold an Investor Day in New York City on Thursday, December 7, 2006. MMC's senior management will provide an update on the company's strategic outlook, financial performance, and growth initiatives.

Michael G. Cherkasky, MMC's president and chief executive officer, will host the event. It will include presentations by senior executives of MMC and its operating companies, including Marsh, Guy Carpenter, Kroll, Mercer Human Resource Consulting, Mercer Specialty Consulting, and Putnam Investments.

Due to space limitations, MMC is limiting attendance to invited members of the investment community. The event will be webcast on MMC's website at www.mmc.com.

MMC is a global professional services firm with annual revenues of approximately $12 billion. It is the parent company of Marsh, the world's leading risk and insurance services firm; Guy Carpenter, the world's leading risk and reinsurance specialist; Kroll, the world's leading risk consulting company; Mercer, a major global provider of human resource and specialty consulting services; and Putnam Investments, one of the largest investment management companies in the United States. Approximately 55,000 employees provide analysis, advice, and transactional capabilities to clients in over 100 countries. Its stock (ticker symbol: MMC) is listed on the New York, Chicago, Pacific, and London stock exchanges. MMC's website address is www.mmc.com.