Oslo, August 27, 2011 -  Aon Corporation (NYSE:AON) today announced that Norway’s largest insurance broker, Aon Grieg AS, has become a wholly-owned subsidiary of Aon with the acquisition of the remaining minority share of the Grieg Group. Financial terms were not disclosed.

Aon acquired Grieg Insurance in 1998, forming Aon Grieg. After the transaction, the Grieg Group retained a minority share of 30 per cent of Aon Grieg and remained an important part of the company, contributing knowledge and experience from the Norwegian insurance market. In 2003, the Grieg Group reduced its ownership share to 20 per cent.

“Ever since 1998 there has been an understanding that we one day would sell our share. We believe it is natural for us to withdraw after 13 years now that Aon Grieg is in such a strong position”, says Per Grieg Jr., who owns the Grieg Group with his three sisters.

Continued co-operation
Prior to the transaction, Grieg Jr. had been a member of the Board of Directors of Aon Grieg. With Aon Grieg now being wholly owned by Aon, Grieg Jr. will join a newly created Advisory Board to the insurance broker.

“Relations between Aon and the Grieg Group have been good and close, and we will continue to work together. Aon will also continue as the Grieg Group’s insurance broker”, says Aon Grieg CEO Espen Husstad, adding that Aon will be able to use the company name Aon Grieg for a period of 12 months in order to ensure a smooth transition.

Aon’s chief executive officer for the Benelux & Nordic region, Lex Geerdes, is pleased with the company’s work together with the Grieg Group on behalf of their clients.

“Representatives from the Grieg Group have been valuable contributors to the overall growth of Aon Grieg. Their knowledge has been instrumental in helping Aon gain the position that we have in Norway today and in our ability to serve our clients. We look forward to working with them after this transaction as well,” Geerdes says.

About Aon Corporation
Aon Corporation (NYSE:AON) is the leading global provider of risk management services, insurance and reinsurance brokerage, and human capital solutions and outsourcing. Through its more than 60,000 colleagues worldwide, Aon unites to deliver distinctive client value via innovative and effective risk management and workforce productivity solutions. Aon's industry-leading global resources and technical expertise are delivered locally in over 120 countries. Named the world's best broker by Euromoney magazine's 2008, 2009 and 2010 Insurance Survey, Aon also ranked highest on Business Insurance's listing of the world's insurance brokers based on commercial retail, wholesale, reinsurance and personal lines brokerage revenues in 2008 and 2009. A.M. Best deemed Aon the number one insurance broker based on revenues in 2007, 2008 and 2009, and Aon was voted best insurance intermediary 2007-2010, best reinsurance intermediary 2006-2010, best captives manager 2009-2010, and best employee benefits consulting firm 2007-2009 by the readers of Business Insurance. Visit http://www.aon.com for more information on Aon and http://www.aon.com/unitedin2010 to learn about Aon's global partnership and shirt sponsorship with Manchester United

Safe Harbor Statement
This communication contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include: the possibility that the expected efficiencies and cost savings from the merger with HewittAssociates Inc. (“Hewitt”)will not be realized, or will not be realized within the expected time period; the risk that the Aon and Hewitt businesses will not be integrated successfully; disruption from the merger with Hewitt making it more difficult to maintain business and operational relationships; general economic conditions in different countries in which Aon does business around the world; changes in global equity and fixed income markets that could affect the return on invested assets; fluctuations in exchange and interest rates that could influence revenue and expense; rating agency actions that could affect Aon's ability to borrow funds; funding of Aon's various pension plans; our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, and the ability to achieve those cost savings; changes in the competitive environment; changes in commercial property and casualty markets and commercial premium rates that could impact revenues; the outcome of inquiries from regulators and investigations related to compliance with the U.S. Foreign Corrupt Practices Act and non-U.S. anti-corruption laws; the impact of investigations brought by U.S. state attorneys general, U.S. state insurance regulators, U.S. federal prosecutors, U.S. federal regulators, and regulatory authorities in the U.K. and other countries; the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions and ERISA class actions; the cost of esolution of other contingent liabilities and loss contingencies, including potential liabilities arising from error and omissions claims against Aon; the extent to which Aon retains existing clients and attract new businesses; the extent to which Aon manages certain risks created in connection with the various services, including fiduciary and advisory services, among others, that Aon currently provides, or will provide in the future, to clients; the extent to which Aon retains existing employees and attracts new personnel; Aon’s ability to maintain the security and privacy of confidential information belonging to its clients or their personnel; Aon’s ability to innovate and keep pace with rapid and continuing changes in technology, industry standards and client preferences; the impact of, and potential challenges in complying with, legislation and regulation in the jurisdictions in which Aon operates, particularly given the global scope of Aon’s businesses and the possibility of conflicting regulatory requirements across jurisdictions in which Aon does business; changes in costs or assumptions associated with our outsourcing and consulting engagements that affect the profitability of these engagements; and the ability to realize the anticipated benefits to Aon of the Benfield merger. Further information concerning Aon and its business, including factors that potentially could materially affect Aon's financial results, is contained in Aon's and, historically, Hewitt's filings with the SEC. See Aon’s Annual Report on Form 10-K and Annual Report to Stockholders for the fiscal year ended December 31, 2010 and Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2011 and other public filings with the SEC for a further discussion of these and other risks and uncertainties applicable to our businesses. Aon does not undertake, and expressly disclaims, any duty to update any forward-looking statement whether as a result of new information, future events or changes in their respective expectations, except as required by law.

 Media Contact:
Cecilie Sveum
+47 93033311
cecili.sveum@aon.no