Exhibit 99.1

News from Aon

Aon Reports Second Quarter 2012 Results

- Total revenue was $2.8 billion with organic revenue growth of 4% -

- EPS from continuing operations was $0.73 -

Second Quarter Summary

·                  EPS from continuing operations, adjusted for certain items, was $1.02

·                  Risk Solutions revenue decreased 1% to $1.9 billion with organic revenue growth of 4%

·                  Risk Solutions operating margin was 20.2% and the operating margin, adjusted for certain items, increased 80 basis points to 21.9%

·                  HR Solutions revenue increased 3% to $931 million with organic revenue growth of 4%

·                  HR Solutions operating margin was 6.2% and the operating margin, adjusted for certain items, decreased 440 basis points to 15.4%

·                  Repurchased 5.3 million Class A ordinary shares for approximately $250 million

·                  On April 2, 2012, the Company completed its change in corporate domicile of the parent company of the Aon group of companies from Delaware to the U.K.

·                  On April 19, 2012, the Company announced the authorization of a $5 billion share repurchase program and a 5% increase to the annual cash dividend

CHICAGO, IL — July 27, 2012 - Aon plc (NYSE: AON) today reported results for the three months ended June 30, 2012.

Net income attributable to Aon shareholders decreased 5% to $246 million, or $0.73 per share, compared to $258 million, or $0.75 per share for the prior year quarter.  Net income attributable to Aon shareholders from continuing operations was $247 million, or $0.73 per share, compared to $256 million, or $0.75 per share, for the prior year quarter.  Net income per share attributable to Aon shareholders from continuing operations, adjusted for certain items, was $1.02, compared to $1.03 in the prior year quarter.  Certain items that impacted second quarter results and comparisons with the prior year quarter are detailed in the “Reconciliation of Non-GAAP Measures - Operating Income and Diluted Earnings per Share” on page 12 of this press release.

“Our second quarter results reflect improved organic revenue growth across all of our major businesses as we make significant investments to further strengthen our client-serving capabilities,” said Greg Case, president and chief executive officer.  “While macro conditions remain fragile globally, we continue to anticipate improved performance in the second half of the year, our underlying performance is on track with our long-term targets and we have completed significant steps to position the firm for long-term growth, strong free cash flow generation and increased financial flexibility as highlighted by the repurchase of $250 million of ordinary shares in the quarter.”

SECOND QUARTER FINANCIAL SUMMARY

Total revenue was flat to the prior year quarter at $2.8 billion driven by a 4% increase in organic revenue and a 1% increase in commissions and fees resulting from acquisitions, net of divestitures, offset by a 4% decrease from unfavorable foreign currency translation and a 33% decline in investment income.

Total operating expenses increased 2%, or $56 million, to $2.4 billion due primarily to a 4% increase in organic revenue, incremental investments in key talent and capabilities, $14 million of headquarter relocation costs and a $13 million increase in intangible asset amortization expense, partially offset by a $93 million favorable impact from foreign currency translation and a $16 million decline in lease termination costs.

Depreciation expense decreased 2%, or $1 million, to $57 million compared to the prior year quarter.

Intangible asset amortization expense increased 14%, or $13 million, to $104 million compared to the prior year quarter due primarily to a $16 million increase relating to assets associated with the merger with Hewitt.

Restructuring expenses were $13 million compared to $14 million in the prior year quarter.  In the second quarter, the Company incurred $11 million of costs in the HR Solutions segment and $2 million of costs in the Risk Solutions segment related to the Aon Hewitt restructuring program.  The Company has closed and completed all restructuring activities and incurred 100% of the total costs for the Aon Benfield restructuring program.  An analysis of restructuring-related costs by type and segment are detailed on page 13 of this release.

Restructuring savings in the second quarter related to the Aon Hewitt restructuring program are estimated at $57 million compared to $34 million in the prior year quarter.  Of the estimated savings in the second quarter, approximately $10 million were related to the Risk Solutions segment compared to $2 million in the prior year quarter.  The Company expects to deliver cumulative expense savings of $355 million in 2013 related to the Aon Hewitt restructuring program, including $280 million related to the restructuring program and $75 million in additional synergy savings from areas such as information technology, procurement and public company costs.

Associated with the transfer of the Health and Benefits business effective January 1, 2012, approximately $46 million of the estimated savings under the Aon Hewitt restructuring program will be achieved in Risk Solutions.  As of the second quarter, an estimated $26 million of cumulative savings have been achieved in Risk Solutions.

Restructuring savings in the second quarter related to the Aon Benfield restructuring program are estimated at $36 million compared to $30 million in the prior year quarter.  Before any potential reinvestment of savings, the Aon Benfield restructuring program is expected to deliver cumulative expense savings of $146 million in 2012 related to the Risk Solutions segment.

Foreign currency exchange rates in the second quarter had a $0.03 per share, or $13 million pretax ($13 million in Risk Solutions, $2 million in HR Solutions, -$2 million in unallocated expenses), unfavorable impact on adjusted net income from continuing operations if the Company were to translate prior year quarter results at current quarter foreign exchange rates.

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Effective tax rate on net income from continuing operations increased to 27.5% in the second quarter compared to 24.7% in the prior year quarter.  The effective tax rate in the second quarter of 2011 was favorably impacted by the resolution of an income tax audit and certain deferred tax adjustments.  The Company anticipates an effective tax rate on net income from continuing operations of approximately 28.0% in 2012.

Average diluted shares outstanding decreased to 335.6 million in the second quarter compared to 342.7 million in the prior year quarter. The Company repurchased 5.3 million Class A ordinary shares for approximately $250 million in the second quarter.  As part of the change in corporate domicile, Aon plc’s Board of Directors authorized a $5 billion share repurchase program on April 19, 2012 that replaced the previous share repurchase program authorized by Aon Corporation’s Board of Directors in January 2010.  The Company has $4.7 billion of remaining authorization.

SECOND QUARTER SEGMENT REVIEW

Certain noteworthy items impacted operating income and operating margins in the second quarter of 2012 and 2011.  The second quarter segment reviews provided below include supplemental information related to organic revenue, adjusted operating income and operating margin, which is described in detail on the “Reconciliation of Non-GAAP Measures - Organic Revenue” on page 11 and “Reconciliation of Non-GAAP Measures - Operating Income and Diluted Earnings per Share” on page 12 of this press release.

RISK SOLUTIONS

Risk Solutions total revenue decreased 1% to $1.9 billion compared to the prior year quarter due to 4% organic growth in commissions and fees offset by a 4% unfavorable impact from foreign currency and a 33% decline in investment income.

Retail Brokerage organic revenue increased 4% reflecting revenue growth in both the Americas and International businesses.  Americas organic revenue increased 4% primarily as a result of strong management of the renewal book portfolio across U.S. Retail and Affinity and strong new business growth in Latin America.  International organic revenue increased 3% driven by strong growth across Asia, New Zealand and emerging markets, and sustained management of the renewal book portfolio across continental Europe, despite continued macro-economic pressures.  Reinsurance organic revenue increased 7% due primarily to strong new business growth in treaty placements globally, both recurring and non-recurring, and a favorable impact related to pricing in the near-term from property catastrophe exposed regions.

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Compensation and benefits for the second quarter decreased 1%, or $7 million, compared to the prior year quarter due primarily to a $46 million favorable impact from foreign currency translation and benefits related to the formal restructuring programs, partially offset by 4% organic revenue growth and investments in key talent.

Other expenses for the second quarter decreased 3%, or $12 million, primarily due to a $27 million favorable impact from foreign currency translation and a $16 million decline in lease termination costs, partially offset by 4% organic revenue growth, $8 million of restructuring costs and incremental investments in GRIP related services.

Second quarter operating income increased 2% to $384 million.  Adjusting for certain items detailed on page 12 of this press release, operating income increased 3%, or $12 million, compared to the prior year quarter, and operating margin increased 80 basis points to 21.9% due primarily to organic revenue growth, an 80 basis point favorable benefit from lower lease termination costs and savings related to the restructuring programs, partially offset by significant investments in GRIP related services and key talent across Asia and Latin America.

HR SOLUTIONS

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HR Solutions total revenue increased 3% to $931 million compared to the prior year quarter due to 4% organic growth in commissions and fees and a 1% favorable impact from acquisitions, net of divestitures, partially offset by a 2% unfavorable impact from foreign currency.

Organic revenue in Consulting Services increased 3% driven primarily by strong growth in compensation consulting, investment consulting and growth across businesses in Asia for talent and reward solutions, partially offset by a decline in discretionary demand in retirement consulting in Europe.  Organic revenue in Outsourcing increased 6% due primarily to new client wins and demand for discretionary services in HR business process outsourcing, partially offset by anticipated price compression and a decline in project-related revenue.

Compensation and benefits increased 6%, or $34 million, compared to the prior year quarter due primarily to 4% organic revenue growth, investments in key talent and $9 million of deferred costs related to new client implementations, primarily offset by a $13 million favorable impact from foreign currency translation, benefits related to the Aon Hewitt restructuring program and a $7 million decline in restructuring costs.

Other expenses increased 10%, or $28 million, from the prior year quarter due primarily to a $16 million increase in intangible asset amortization expense, 4% organic revenue growth and investments in the business, partially offset by a $7 million favorable impact from foreign currency translation and a $5 million decline in Hewitt related costs.

Second quarter operating income decreased 39% to $58 million.  Adjusting for certain items detailed on page 12 of this press release, operating income decreased 20%, or $36 million, to $143 million, and operating margin decreased 440 basis points to 15.4% versus the prior year quarter due primarily to a $23 million, or 250 basis point, unfavorable impact for investment spend in new growth opportunities, primarily in healthcare exchanges and HR business process outsourcing, an unfavorable revenue mix shift, and a $9 million increase in deferred costs, partially offset by benefits related to the Aon Hewitt restructuring program.

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INCOME FROM CONTINUING OPERATIONS

Unallocated expenses increased $15 million to $48 million including $14 million of costs related to the relocation of the Company’s headquarters.  Interest income decreased $2 million to $2 million due to lower average interest rates and lower average cash balances.  Interest expense decreased $6 million to $57 million due primarily to a decline in the average rate on total debt outstanding.  Other income (expense) of $12 million primarily includes an $18 million gain due to the favorable impact of exchange rates on remeasurement of assets and liabilities in non-functional currencies, partially offset by $8 million of losses on certain Company owned life insurance plans and other long-term investments.  The prior year quarter primarily included a non-cash charge of $19 million related to the accelerated amortization of deferred financing costs and a $13 million loss related to the Company’s ownership in certain insurance investment funds, partially offset by $9 million of distributions received from certain private equity securities.

Conference Call, Presentation Slides and Webcast Details

The Company will host a conference call on Friday, July 27, 2012 at 7:30 a.m. central time.  Interested parties can listen to the conference call via a live audio webcast and view the presentation slides at www.aon.com.

About Aon

Aon plc (NYSE: AON) is the leading global provider of risk management, insurance and reinsurance brokerage, and human resources solutions and outsourcing services. Through its more than 61,000 colleagues worldwide, Aon unites to empower results for clients in over 120 countries via innovative and effective risk and people solutions and through industry-leading global resources and technical expertise. Aon has been named repeatedly as the world’s best broker, best insurance intermediary, reinsurance intermediary, captives manager and best employee benefits consulting firm by multiple industry sources. Visit www.aon.com for more information on Aon and www.aon.com/manchesterunited 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:  general economic conditions in different countries in which Aon does business around the world, including conditions is the European Union relating to sovereign debt and the continued viability of the Euro; changes in the competitive environment; changes in global equity and fixed income markets that could affect the return on invested assets; changes in the funding status of Aon’s

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various defined benefit pension plans and the impact of any increased pension funding resulting from those changes; rating agency actions that could affect Aon’s ability to borrow funds; fluctuations in exchange and interest rates that could influence revenue and expense; the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions and ERISA class actions; the impact of any investigations brought by regulatory authorities in the U.S., U.K. and other countries; the cost of resolution of other contingent liabilities and loss contingencies, including potential liabilities arising from error and omissions claims against Aon; the failure to retain and attract qualified personnel; 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; the effect of the change in global headquarters and jurisdiction of incorporation, including the reaction of clients, employees and other constituents, compliance with U.K. regulatory regimes or the failure to realize some of the anticipated benefits; the extent to which Aon retains existing clients and attracts new businesses and Aon’s ability to incentivize and retain key employees; 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 possibility that the expected efficiencies and cost savings from the merger with Hewitt Associates 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; Aon’s ability to implement restructuring initiatives and other initiatives intended to yield cost savings, and the ability to achieve those cost savings; the potential of a system or network disruption resulting in operational interruption or improper disclosure of personal data; changes in commercial property and casualty markets and commercial premium rates that could impact revenues; any inquiries relating to compliance with the U.S. Foreign Corrupt Practices Act and non-U.S. anti-corruption laws and with U.S. and non-U.S. trade sanctions regimes; and changes in costs or assumptions associated with Aon’s HR Solutions outsourcing and consulting engagements that affect the profitability of these engagements. Further information concerning Aon and its business, including factors that potentially could materially affect Aon’s financial results, is contained in Aon’s filings with the SEC. See Aon’s Annual Report on Form 10-K and Annual Report to Shareholders for the fiscal year ended December 31, 2011 and our Quarterly Report on Form 10-Q for the three months ended March 31, 2012 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.

Explanation of Non-GAAP Measures

This communication includes supplemental information related to organic revenue and several additional measures including expenses, margins and income per share, that exclude the effects of restructuring charges, transaction and integration costs and certain other noteworthy items that affected results for the comparable periods.  Organic revenue excludes from reported revenues the impact of foreign exchange, acquisitions, divestitures, transfers between business units, reimbursable expenses and unusual items.  The impact of foreign exchange is determined by translating last year’s revenue, expense or net income at this year’s foreign exchange rates.  Reconciliations are provided in the attached schedules.  Supplemental organic revenue information and additional measures that exclude the effects of the restructuring charges and certain other items do not affect net income or any other GAAP reported amounts.  Management believes that these measures are important to make meaningful period-to-period comparisons and that this supplemental information is helpful to investors.  They should be viewed in addition to, not in lieu of, the Company’s Consolidated Financial Statements.  Industry peers provide similar supplemental information regarding their performance, although they may not make identical adjustments.

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Aon plc

Condensed Consolidated Statements of Income (Unaudited)

(1)          Beginning in 2012, amounts related to gains and losses on foreign currency transactions have been included in Other income (expense). These amounts in prior periods, which were historically included in Other general expenses, have been reclassified to conform with the current presentation. The amounts reclassified in the three and six months ended June 30, 2011 were $6 million and $8 million, respectively, of expense from Other general expenses to Other income (expense).

(2)          Tax rate for continuing operations is 27.5% and 24.7% for the three months ended June 30, 2012 and 2011, respectively, and 27.8% and 26.8% for the six months ended June 30, 2012 and 2011, respectively.

(3)          Tax rate for discontinued operations is not meaningful for the three months ended June 30, 2012 and 2011, respectively, and the six months ended June 30, 2012, and is 23.2% for the six months ended June 30, 2011.

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Aon plc

Revenue from Continuing Operations (Unaudited)

(1)          Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and unusual items. Change in organic revenue, a non-GAAP measure, is reconciled to the corresponding U.S. GAAP percent change in revenue on page 11 of this release.

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Aon plc

Segments (Unaudited)

Risk Solutions

HR Solutions

Total Operating Income (Loss)

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Aon plc

Reconciliation of Non-GAAP Measures - Organic Revenue (Unaudited)