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NEW YORK, NEW YORK, November 6, 2006 — Marsh & McLennan Companies, Inc. (MMC) today announced that John T. Sinnott, vice chairman, office of the CEO, will retire effective December 31, 2006, after a long and distinguished career at the company.

Sinnott has held his current position since July 1, 2005, when he re-joined MMC after a period of retirement. He was also a director of Marsh Inc. from June 2005 through December 2005 and chairman and chief executive officer of Marsh Inc. from 1999 to December 2002 and chairman of Marsh until his retirement in July 2003. Sinnott also was a member of the MMC board of directors from 1992 through May 2003. He joined MMC's predecessor company, Marsh & McLennan, Incorporated, in 1963, and held various executive positions with the Company including vice chairman and CEO of J&H Marsh & McLennan, Inc. and president and chief executive officer of Marsh & McLennan, Incorporated.

"Three and a half years after his originally planned retirement and after more than 43 years of service to Marsh & McLennan, Jack Sinnott has decided to 're-retire' at the end of this year," said Mike Cherkasky, president and chief executive officer of MMC.

"Jack clearly is not one to let any dust settle under him and intends to remain active by reinstating some long awaited plans with his wife, Eileen, and continuing to serve as a trustee/director on five not-for-profit boards and one public company board. We thank him for his loyalty and exceptional service to the firm over so many years and wish him and Eileen good health and much happiness in the future."

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.