Marsh & McLennan Companies to Hold Investor...

Marsh & McLennan Companies to Hold Investor Call on August 7 to Discuss Second Quarter 2012 Results

Marsh & McLennan Companies

Marsh & McLennan Companies, Inc. (NYSE: MMC), a global professional services firm providing advice and solutions in risk, strategy and human capital, plans to announce second quarter 2012 results on Tuesday, August 7, 2012, in a news release to be issued before the market opens. The release will also be available on the Marsh & McLennan Companies website at www.mmc.com.

Brian Duperreault, President and CEO of Marsh & McLennan Companies and Dan Glaser, Group President and COO, will lead a discussion with investors regarding financial results at 8:30 a.m. Eastern Time on August 7. The discussion will include a question-and-answer period.

To participate in the teleconference, please dial [phone]. Callers from outside the United States should dial [phone]. The access code for both numbers is 4389734. 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.

About Marsh & McLennan Companies

MARSH & MCLENNAN COMPANIES (NYSE: MMC) is a global team of professional services companies offering clients advice and solutions in the areas of risk, strategy and human capital. Marsh is a global leader in insurance broking and risk management; Guy Carpenter is a global leader in providing risk and reinsurance intermediary services; Mercer is a global leader in human resource consulting and related services; and Oliver Wyman is a global leader in management consulting. Marsh & McLennan Companies’ 53,000 colleagues worldwide provide analysis, advice and transactional capabilities to clients in more than 100 countries. The Company prides itself on being a responsible corporate citizen and making a positive impact in the communities in which it operates. Visit www.mmc.com for more information.

Media:

Marsh & McLennan Companies

Laura Cora, [phone]

[e-mail]

or

Investor:

Marsh & McLennan Companies

Scott Douglas, [phone]

[e-mail]