MMC TO HOLD INVESTOR CALL ON NOVEMBER 1 TO DISCUSS THIRD QUARTER 2006 RESULTS

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NEW YORK, NEW YORK, October 18, 2006 — Marsh & McLennan Companies, Inc. (MMC) plans to announce third quarter 2006 results on Wednesday, November 1, 2006 in a news release to be issued before the market opens. The release will also be available on MMC's website at www.mmc.com.

Michael G. Cherkasky, president and chief executive officer of MMC, and Matthew B. Bartley, chief financial officer, will lead a discussion with investors on financial results, including a question and answer period, at 10:00 a.m. Eastern Time on November 1.

To participate in the teleconference, please dial 866 564 7444. Callers from outside the United States should dial 719 234 0008. The access code for both numbers is 7646511. The live audio webcast may be accessed at www.mmc.com. A replay of the webcast will be available approximately two hours after the event at the same web address.

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.