Aon plcFourth Quarter and Full Year 2013 Results January 31, 2014

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Greg CaseChief Executive Officer

Christa DaviesChief Financial Officer

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Safe Harbor StatementThis 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 anduncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. These forward-lookingstatements include information about possible or assumed future results of our operations. All statements, other than statements of historical facts that address activities,events or developments that we expect or anticipate may occur in the future, including such things as our outlook, future capital expenditures, growth in commissions andfees, changes to the composition or level of our revenues, cash flow and liquidity, expected tax rates, business strategies, competitive strengths, goals, the benefits of newinitiatives, growth of our business and operations, plans and references to future successes, are forward-looking statements. Also, when we use the words such as‘anticipate', ‘believe', ‘estimate', ‘expect', ‘intend', ‘plan', ‘probably', or similar expressions, we are making forward-looking statements.

The following factors, among others, could cause actual results to differ from those set forth in the forward looking statements: general economic conditions in differentcountries in which Aon does business around the world; changes in the competitive environment; changes in global equity and fixed income markets that could affect thereturn on invested assets; changes in the funding status of Aon's various defined benefit pension plans and the impact of any increased pension funding resulting fromthose 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 anyinvestigations brought by regulatory authorities in the U.S., U.K. and other countries; the cost of resolution of other contingent liabilities and loss contingencies, includingpotential liabilities arising from error and omissions claims against Aon; the failure to retain and attract qualified personnel; the impact of, and potential challenges incomplying with, legislation and regulation in the jurisdictions in which Aon operates, particularly given the global scope of Aon’s businesses and the possibility of conflictingregulatory requirements across jurisdictions in which Aon does business; the effect of the change in global headquarters and jurisdiction of incorporation, includingdifferences in 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 and business process outsourcingservices, among others, that Aon currently provides, or will provide in the future, to clients; Aon’s ability to implement restructuring initiatives and other initiatives intendedto yield cost savings, and the ability to achieve those cost savings; the potential of a system or network disruption resulting in operational interruption or improperdisclosure of personal data; 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 Aon’s ability to grow, develop and integrate companies that it acquires or new lines of business.

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 theSEC. See Aon’s Annual Report on Form 10-K and its Quarterly Reports on Form 10-Q for a further discussion of these and other risks and uncertainties applicable to Aon’sbusinesses. Aon does not undertake, and expressly disclaims, any duty to update any forward-looking statement whether as a result of new information, future events orchanges in their respective expectations, except as required by law.

Explanation of Non-GAAP MeasuresThis communication includes supplemental information related to organic revenue, free cash flow and several additional measures including expenses, margins and incomeper share, that exclude the effects of restructuring charges, intangible asset amortization, capital expenditures, transaction and integration costs and certain othernoteworthy 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 andadditional measures that exclude the effects of the restructuring charges and certain other items do not affect net income or any other GAAP reported amounts. Free cashflow is cash flow from operating activity less capital expenditures. Management believes that these measures are important to make meaningful period-to-periodcomparisons and that this supplemental information is helpful to investors. They should be viewed in addition to, not in lieu of, the Company’s Consolidated FinancialStatements. Industry peers provide similar supplemental information regarding their performance, although they may not make identical adjustments.

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Key Metrics* – Positive Performance Across All Four Metrics

Q4 Organic Revenue Solid growth with organic revenue of +3% in Risk Solutions and

+8% in HR Solutions Delivered strong growth of +11% in Outsourcing in HR Solutions

Q4 Operating Margin Risk Solutions increased +40 bps driven by solid organic revenue

and restructuring savings, partially offset by a -40 basis point unfavorable impact from FX translation

HR Solutions increased +440 bps driven by strong organic revenue and restructuring savings

Q4 EPS Double-digit earnings growth reflects a strong operating

performance, a lower effective tax rate and effective capital management

Q4 2013

1. Organic Revenue1 +4% +3%Prior Year +4% +4%

2. Operating Margin2 21.2% 19.0%Y-o-Y change +160 bps +40 bps

3. Earnings per Share2 $1.54 $4.89Y-o-Y change +21% +16%

4. Free Cash Flow3 $594M $1.4BY-o-Y change +23% +22%

* The results presented above are non-GAAP measures that are reconciled in the appendix of this presentation 1 Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and other unusual items. Change in

organic revenue, a non-GAAP measure, is reconciled to the corresponding U.S. GAAP change in revenue in Appendix A of this presentation2 Certain noteworthy items impacted operating margin and earnings per share in the fourth quarter and full year of 2013 and 2012. A reconciliation of non-GAAP

Measures for operating margin and diluted earnings per share to the corresponding U.S. GAAP measure is in Appendix B of this presentation3 Free cash flow is defined as cash flow from operations less capital expenditures. This non-GAAP measure does not imply or represent a precise calculation of

residual cash flow available for discretionary expenditures. A reconciliation of free cash flow to the corresponding U.S. GAAP measure can be found in Appendix A of this presentation

Q4 Free Cash Flow Double-digit free cash flow growth reflects strong working capital

performance, a decrease in pension contributions and a 19% decrease in capital expenditures

Record cash flow from operations of $1.6 billion for full year 2013

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Organic Revenue¹ – Strong Growth in HR Solutions

Q4 Americas: Strong growth in Latin America and

record new business in US Retail

International: Strong growth across emerging markets, New Zealand and Asia, partially offset by a decline in Ireland

Reinsurance: Growth in capital markets transactions and advisory business, as well as net new business growth in treaty placements, offset by unfavorable impact from timing in the quarter

Q4 2013

Risk SolutionsAmericas 4% 5%

International 2% 2%

Retail 3% 4%

Reinsurance 0% 2%

Total Risk Solutions +3% +3%

HR SolutionsConsulting 1% 3%

Outsourcing 11% 3%

Total HR Solutions +8% +3%

Total Aon +4% +3%

Q4 Consulting: Growth in investment and

compensation consulting, partially offset by a decline in actuarial services in retirement consulting

Outsourcing: Strong growth in health care exchanges and modest growth in benefits administration and HR BPO

1 Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and other unusual items. Change in organic revenue, a non-GAAP measure, is reconciled to the corresponding U.S. GAAP change in revenue in Appendix A of this presentation

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Investment in the Business – Positioned for Long-Term Growth

“We believe Aon is in a unique position. Solid long-term operating performance, combined withexpense discipline and strong cash flow, continues to enable substantial investment in colleagues andcapabilities to better serve clients.”

Risk Solutions HR Solutions

Roll-out of the Revenue Engine and Client Promise internationally to drive greater retention/rollover rates

Global Risk Insight Platform (GRIP), which is the world’s leading global repository of risk and insurance placement information

Aon Broking initiative to better match client needs with insurer appetite for risk

Aligning our global health and benefits platform to broaden our global distribution channel and strengthen deep brokerage capabilities

Further development of data and analytics capability at Aon Benfield to strengthen already industry leading client serving capability

Expansion of content and global footprint through tuck-in acquisitions that increase scale in emerging markets or expand capability to better serve clients

Significant investments in health care exchanges enabling clients to begin transitioning their participants to a market-based, defined contribution model for healthcare, while addressing unsustainable healthcare cost increases and decreasing population health

Expanding in high-growth areas for both current clients and new markets; focused on innovative solutions to de-risk pension plans and providing a broader set of advisory and advocacy solutions to our clients’ employees to enable greater choice and improve decision-making on their retirement and health care options

Expansion of our industry-leading benefits administration solutions and technology platform, including extensive mobile solutions

Expansion of our international footprint to support a global workforce, with investments in key talent and capabilities across emerging markets

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$416

$480

Net Income¹

EPS* – Delivered Double-Digit Earnings Growth“Our fourth quarter and full year results reflect double-digit earnings growth highlighted by strong operating performance and effective capital management. We finished 2013 having made significant investments across the firm to further position our industry leading-franchise for long-term growth, improved operational performance and significant shareholder value creation.”

($ millions) Q4 2013

Net Income1 $480 $1,541Y-o-Y change +15% +10%

Earnings Per Share1 $1.54 $4.89Y-o-Y change +21% +16%

* The results presented above are non-GAAP measures that are reconciled in the appendix of this presentation 1 Certain noteworthy items impacted earnings per share in the fourth quarter and full year of 2013 and 2012. A reconciliation of non-GAAP measures for

diluted earnings per share to the corresponding U.S. GAAP measure is in Appendix B of this presentation

$1.27

$1.54

EPS¹Q4’12 Q4’13

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Operating Margins* – Progress Against Long-Term Targets

Q4 Positive Impact Organic revenue growth of +3% Restructuring savings of ~$9 million

Negative Impact Unfavorable impact from foreign currency

translation of $16 million, or -40 bps

Q4 2013Risk Solutions

Operating Income1 $484 $1,749Y-o-Y change +2% +6%

Operating Margin1 23.6% 22.5%Y-o-Y change +40 bps +80 bps

HR Solutions

Operating Income1 $249 $678Y-o-Y change +36% +4%

Operating Margin1 21.4% 16.7%Y-o-Y change +440 bps +10 bps

Q4 Positive Impact Organic revenue growth of +8% Restructuring savings of ~$18 million

Negative Impact Continued investment in long-term growth

opportunities

($ millions)

* The results presented above are non-GAAP measures that are reconciled in the appendix of this presentation 1 Certain noteworthy items impacted operating margin in the fourth quarter and full year of 2013 and 2012. A reconciliation of non-GAAP measures for

operating margin to the corresponding U.S. GAAP measure is in Appendix B of this presentation

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1. Deliver $43 million of remaining

restructuring savings by the end of 2014

2. Growth in the core business and return

on incremental investments including

health care exchanges

3. Improvement in HR Business Process

Outsourcing

1. Deliver $30 million of remaining

restructuring savings by the end of 2014

2. Continued rollout of Revenue Engine

internationally

3. Aon Broking and GRIP related initiatives

4. Increases in short-term interest rates

5. Improvements in GDP or insurance

pricing

5.8%

11.7%

14.9% 15.2% 15.3%17.6% 16.7%

22%

2006 2007 2008 2009 2010 2011 2012 2013 Target

16.6%

18.2% 18.7%

21.6%22.4%

21.6% 21.7%22.5%

2006 2007 2008 2009 2010 2011 2012 2013 Target

Long-Term Operating Margin Targets

* The results above represent non-GAAP measures. See Appendix B and C for a reconciliation of non-GAAP measures to the corresponding U.S. GAAP measure

Risk Solutions*

HR Solutions*

26%

16.6%

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Unallocated Expenses & Non-Operating Segment Information

Q4’12 Q4’13QuarterlyGuidance

Unallocated Expenses1 ($48) ($54) ($45)

Interest Income $4 $3 $1

Interest Expense ($55) ($57) ($60)

Other Income (expense)1 - $14 -

Effective Tax Rate 25.2% 24.2% -

Minority interest ($2) ($5) ($9)

Actual common sharesoutstanding at 12-31-13 (million)

N/A 300.7 -

Comments Unallocated expenses reflects an increase in

certain long-term employee incentive compensation programs

Interest expense reflects an increase in costs associated with certain derivative hedging programs

Interest income decreased due to lower average interest rates and average cash balances

Other Income includes gains on sale of businesses and certain long-term investments

Effective tax rate was favorably impacted by certain discrete tax adjustments and favorably impacted by changes in the geographic distribution of income

Actual common shares outstanding declined due to the Company’s share repurchase program. The Company repurchased $77 mil or 965,487 of ordinary shares in the fourth quarter. Estimated Q1’14 dilutive share count is ~310 mil subject to share price movement, share issuance and share repurchase

1 Certain noteworthy items impacted earnings per share in the fourth quarter and full year of 2013 and 2012. A reconciliation of non-GAAP measures for diluted earnings per share to the corresponding U.S. GAAP measure is in Appendix B of this presentation

($ millions)

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Solid Balance Sheet and Free Cash Flow Generation

Sept 30,2013

Dec 31,2013

Cash $369 $477

Short-Term Investments $357 $523

Total Debt $4,558 $4,389

Total Aon Shareholders’ Equity $7,534 $8,145

Total Debt to Capital 37.7% 35.0%

Balance Sheet($ mil)

1 Free cash flow is defined as cash flow from operations less capital expenditures. This non-GAAP measure does not imply or represent a precise calculation of residual cash flow available for discretionary expenditures. A reconciliation of free cash flow to the corresponding U.S. GAAP measure can be found in Appendix A of this presentation

Cash Flow from Operations($ mil)

Free Cash Flow 1($ mil)

Q4 and 2013 reflects significantly improved working capital performance

Includes a $70 million decrease in pension contributions in Q4 and an $83 million decrease in total pension contributions for 2013

Both Q4 and 2013 reflect strong cash flow from operations

Includes a $13 million decrease in capital expenditures in Q4 and a $40 million decrease in total capital expenditures for 2013

$552 $649

Q4'12 Q4'13 FY'12 FY'13

$1,419$1,633

$484 $594

Q4'12 Q4'13 FY'12 FY'13

$1,150$1,404

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Significantly Increasing Free Cash Flow*

Uses of Cash ($mil) 2012 2013 2014 2015 2016 2017 2018Pension Contributions¹ $638 $523 $385 $324 $302 $274 $180- Pension Expense (non-cash) $53 $21 ↓ ↓ ↓ ↓ ↓

Restructuring – Cash $143 $152 $92 $37 $17 $12 $8

Capital Expenditures $269 $229 $240 $245 $250 $255 $260

Estimated Net Annual Increase to FCF $146 $187 $111 $37 $28 $93

Cumulative Net Annual Increase to FCF $146 $333 $444 $481 $509 $602

Uses of Free Cash Flow ($mil) 2012 2013Dividends $204 $212

Share Repurchase2 $1,125 $1,102

M & A $162 $54

* Free cash flow is a non-GAAP measures that is defined as cash flow from operations less capital expenditures1 Estimate based on current actuarial assumptions as of 12/31/13 measurement date. Expect to be fully funded on a GAAP basis by end of 2016 for qualified plans2 The Company has $2.87 billion of remaining authorization under its share repurchase program

Cumulative increase of $602 million annually

Aon has the opportunity to double free cash flow from 2012 over the next three to five years driven by three key areas:1. Operational improvement as the firm makes progress towards its long-term operating margin targets2. Declining required uses of cash for pension and restructuring3. A lower effective tax rate over time

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Summary – Continued Long-Term Value Creation

Positioned for sustainable long-term growth

Significant leverage to an improving global economy and insurance pricing

Investing in colleagues and capabilities around the globe to better serve clients

Opportunity for long-term operating margin improvement

Strong balance sheet and free cash flow generation with declining uses of required cash outlays

Increased financial flexibility and effective capital allocation is expected to drive significant shareholder value

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Appendix

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Appendix A: Reconciliation of Non-GAAP Measures – Organic Revenue and Free Cash Flow

Commissions, Fees and Other (millions)Dec. 31,

2013Dec. 31,

2012Risk Solutions Segment:

Retail brokerageAmericas 905$ 883$ 2 % (2) % - % 4 %International 803 811 (1) - (3) 2

Total Retail brokerage 1,708 1,694 1 (1) (1) 3 Reinsurance brokerage 338 349 (3) (3) - -

Total Risk Solutions 2,046 2,043 - (1) (2) 3 HR Solutions Segment:

450 445 1 - - 1 Outsourcing 723 649 11 - - 11 Intrasegment (7) (16) N/A N/A N/A N/A

Total HR Solutions 1,166 1,078 8 - - 8 Total Operating Segments 3,212$ 3,121$ 3 % (1) % - % 4 %

Commissions, Fees and Other (millions)Dec. 31,

2013Dec. 31,

2012Risk Solutions Segment:

Retail brokerageAmericas 3,191$ 3,071$ 4 % (1) % - % 5 %International 3,065 3,018 2 - - 2

Total Retail brokerage 6,256 6,089 3 (1) - 4 Reinsurance brokerage 1,505 1,505 - (1) (1) 2

Total Risk Solutions 7,761 7,594 2 (1) - 3 HR Solutions Segment:

1,626 1,585 3 (1) 1 3 Outsourcing 2,469 2,372 4 - 1 3 Intrasegment (38) (32) N/A N/A N/A N/A

Total HR Solutions 4,057 3,925 3 - - 3 Total Operating Segments 11,818$ 11,519$ 3 % (1) % 1 % 3 %

Dec. 31, 2013

Dec. 31, 2012

Percent Change

Dec. 31, 2012

Cash Provided By (Used For) Operations 649$ 552$ 18 % 1,419$ 15 %Less: Capital Expenditures (55) (68) (19) (269) (15)

Free Cash Flow (3) 594$ 484$ 23 % 1,150$ 22 %

(1) Currency impact is determined by translating last year's revenue at this year's foreign exchange rates.(2) Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and unusual items. (3) Free cash flow is defined as cash flow from operations less capital expenditures. This non-GAAP measure does not imply or represent a

precise calculation of residual cash flow available for discretionary expenditures.

Less: Acquisitions, Divestitures

& Other

Organic Revenue

(2)

Three Months Ended

Percent Change

Less: Currency Impact (1)

Consulting services

Twelve Months Ended

Percent Change

Less: Currency Impact (1)

Less: Acquisitions, Divestitures

& Other

Organic Revenue

(2)

1,633$

1,404$

Consulting services

Three Months Ended Twelve Months Ended

Dec. 31, 2013

Percent Change (millions)

(229)

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Appendix B: Reconciliation of Non-GAAP Measures – Operating Margin and Diluted Earnings per Share

(millions)Risk

SolutionsHR

Solutions

Unallocated Income & Expense Total

Risk Solutions

HR Solutions

Unallocated Income & Expense Total

Revenue 2,053$ 1,166$ (10)$ 3,209$ 7,789$ 4,057$ (31)$ 11,815$ Operating income (loss) - as reported 413$ 156$ (54)$ 515$ 1,540$ 318$ (187)$ 1,671$

Restructuring charges 42 23 - 65 94 80 - 174 Intangible asset amortization 29 70 - 99 115 280 - 395 Headquarters relocation costs - - - - - - 5 5

Operating income (loss) - as adjusted 484$ 249$ (54)$ 679$ 1,749$ 678$ (182)$ 2,245$ Operating margins - as adjusted 23.6% 21.4% N/A 21.2% 22.5% 16.7% N/A 19.0%

(millions)Risk

SolutionsHR

Solutions

Unallocated Income & Expense Total

Risk Solutions

HR Solutions

Unallocated Income & Expense Total

Revenue 2,050$ 1,078$ (13)$ 3,115$ 7,632$ 3,925$ (43)$ 11,514$ Operating income (loss) - as reported 434$ 78$ (51)$ 461$ 1,493$ 289$ (186)$ 1,596$

Restructuring charges 6 30 - 36 35 66 - 101 Intangible asset amortization 35 75 - 110 126 297 - 423 Headquarters relocation costs - - 3 3 - - 24 24

Operating income (loss) - as adjusted 475$ 183$ (48)$ 610$ 1,654$ 652$ (162)$ 2,144$ Operating margins - as adjusted 23.2% 17.0% N/A 19.6% 21.7% 16.6% N/A 18.6%

(millions except per share data) 2013 2012 2013 2012Operating income - as adjusted 679$ 610$ 2,245$ 2,144$

Interest income 3 4 9 10 Interest expense (57) (55) (210) (228) Other income - as reported 14 - 68 2

Headquarters relocation costs - - - 2 Other income - as adjusted 14 - 68 4

Income before income taxes - as adjusted 639 559 2,112 1,930 Income taxes (2) 154 141 536 504

Net income - as adjusted 485 418 1,576 1,426 Less: Net income attributable to noncontrolling interests 5 2 35 27

Net income attributable to Aon shareholders - asadjusted 480$ 416$ 1,541$ 1,399$

Diluted earnings per share - as adjusted 1.54$ 1.27$ 4.89$ 4.21$ Weighted average ordinary shares outstanding - diluted 311.4 327.5 315.4 332.6

(1) Certain noteworthy items impacting operating income in 2013 and 2012 are described in this schedule. The items shown with the caption "as adjusted" are non-GAAP measures.(2) The effective tax rate for continuing operations is 24.2% and 25.2% for the three months ended December 31, 2013 and 2012, respectively and 25.4% and 26.1% for the twelve

months ended December 31, 2013 and 2012, respectively. Adjusting items are generally taxed at the effective tax rate.

Twelve Months EndedDecember 31,

Three Months EndedDecember 31,

Twelve Months Ended December 31, 2013

Three Months Ended December 31, 2012 Twelve Months Ended December 31, 2012

Three Months Ended December 31, 2013

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Appendix C: Reconciliation of Non-GAAP Measures 2006-2011Full Year ended December 31, 2006 Full Year ended December 31, 2007 Full Year ended December 31, 2008 Full Year ended December 31, 2009 Full Year ended December 31, 2010 Full Year ended December 31, 2011

(millions except per share data)Risk

SolutionsHR

Solutions Unallocated ContinuingRisk

SolutionsHR

Solutions Unallocated ContinuingRisk

SolutionsHR

Solutions Unallocated ContinuingRisk

SolutionsHR

Solutions Unallocated ContinuingRisk

SolutionsHR

Solutions Unallocated ContinuingRisk

SolutionsHR

Solutions Unallocated ContinuingSegments

ReportedTotal revenue 5,855 892 (59) 6,688 6,403 860 (29) 7,234 6,728 825 (25) 7,528 6,835 737 23 7,595 6,989 1,545 (22) 8,512 7,537 3,781 (31) 11,287

Compensation and benefits 3,521 610 41 4,172 3,704 576 61 4,341 3,969 553 59 4,581 4,038 493 66 4,597 3,939 1,041 117 5,097 4,179 2,286 102 6,567 Other general expenses 1,527 246 (17) 1,756 1,652 197 41 1,890 1,812 165 30 2,007 1,794 144 39 1,977 1,743 383 63 2,189 1,944 1,147 23 3,114

Total operating expenses 5,048 856 24 5,928 5,356 773 102 6,231 5,781 718 89 6,588 5,832 637 105 6,574 5,682 1,424 180 7,286 6,123 3,433 125 9,681

Operating income (loss) 807$ 36$ (83)$ 760$ 1,047$ 87$ (131)$ 1,003$ 947$ 107$ (114)$ 940$ 1,003$ 100$ (82)$ 1,021$ 1,307$ 121$ (202)$ 1,226$ 1,414$ 348$ (156)$ 1,606$ Operating margin 13.8% 4.0% 11.4% 16.4% 10.1% 13.9% 14.1% 13.0% 12.5% 14.7% 13.6% 13.4% 18.7% 7.8% 14.4% 18.8% 9.2% 14.2%

Interest income 69 100 64 16 15 18 Interest expense (129) (138) (126) (122) (182) (245) Other income (expense) - as adjusted 38 58 1 34 - 5 Income before income taxes 738$ 1,023$ 879$ 949$ 1,059$ 1,384$

ReclassificationsOther general expensesForeign currency remeasurement gains (losses) $ 1 $ 1 $ - $ 2 $ 14 $ (3) $ 2 $ 13 $ 38 $ 2 $ - $ 40 $ (30) $ (1) $ 5 $ (26) $ (21) $ - $ 3 $ (18) $ 1 $ 12 $ (3) $ 10

Other income (expense)Foreign currency remeasurement gains (losses) $ 2 $ 13 $ 40 $ (26) $ (18) $ 10

SegmentsRestatedTotal revenue 5,855 892 (59) 6,688 6,403 860 (29) 7,234 6,728 825 (25) 7,528 6,835 737 23 7,595 6,989 1,545 (22) 8,512 7,537 3,781 (31) 11,287

Compensation and benefits 3,521 610 41 4,172 3,704 576 61 4,341 3,969 553 59 4,581 4,038 493 66 4,597 3,939 1,041 117 5,097 4,179 2,286 102 6,567 Other general expenses 1,528 247 (17) 1,758 1,666 194 43 1,903 1,850 167 30 2,047 1,764 143 44 1,951 1,722 383 66 2,171 1,945 1,159 20 3,124

Total operating expenses 5,049 857 24 5,930 5,370 770 104 6,244 5,819 720 89 6,628 5,802 636 110 6,548 5,661 1,424 183 7,268 6,124 3,445 122 9,691

Operating income (loss) 806$ 35$ (83)$ 758$ 1,033$ 90$ (133)$ 990$ 909$ 105$ (114)$ 900$ 1,033$ 101$ (87)$ 1,047$ 1,328$ 121$ (205)$ 1,244$ 1,413$ 336$ (153)$ 1,596$ Operating margin 13.8% 3.9% 11.3% 16.1% 10.5% 13.7% 13.5% 12.7% 12.0% 15.1% 13.7% 13.8% 19.0% 7.8% 14.6% 18.7% 8.9% 14.1%

Interest income 69 100 64 16 15 18 Interest expense (127) (125) (86) (148) (200) (235) Other income (expense) - as adjusted 38 58 1 34 - 5 Income before income taxes 738$ 1,023$ 879$ 949$ 1,059$ 1,384$

Non-GAAPAs DisclosedRevenue - as adjusted $ 5,840 $ 892 $ (59) $ 6,673 $ 6,403 $ 860 $ (29) $ 7,234 $ 6,728 $ 825 $ (25) $ 7,528 $ 6,835 $ 737 $ 23 $ 7,595 $ 6,989 $ 1,545 $ (22) $ 8,512 $ 7,537 $ 3,781 $ (31) $ 11,287

Operating income (loss) - as reported 807 36 (83) 760 1,047 87 (131) 1,003 947 107 (114) 940 1,003 100 (82) 1,021 1,307 121 (202) 1,226 1,414 348 (156) 1,606 Restructuring charges 139 17 3 159 75 10 - 85 239 15 - 254 381 31 - 412 115 57 - 172 65 48 - 113 Amortization of intangible assets 38 - - 38 38 1 - 39 63 2 - 65 93 - - 93 114 40 - 154 129 233 - 362 Hewitt related costs - - - - - - - - 2 - - 2 - - - - - 19 21 40 - 47 - 47 Legacy receivables write-off - - - - - - - - - - - - - - - - - - - - 18 - - 18 Transaction related costs - proxy - - - - - - - - - - - - - - - - - - - - - - 3 3 Pension curtailment/adjustment - - - - - - - - 6 1 1 8 (54) (20) (4) (78) - - 49 49 - - - - Anti-bribery and compliance initiatives - - - - - - - - 42 - - 42 7 - - 7 9 - - 9 - - - - Resolution of U.K. balance sheet reconciliation difference - - - - - - 15 15 - - - - - - - - - - - - - - - - Benfield integration costs - - - - - - - - - - - - 15 - - 15 - - - - - - - - Reinsurance litigation - - - - 21 - - 21 - - - - - - - - - - - - - - - - Gain on sale of Cambridge preferred stock investment - - - - - - - - - - - - - - - - - - - - - - - - Endurance - - - - - - - - - - - - - - - - - - - - - - - - Contingent commissions (15) - - (15) - - - - - - - - - - - - - - - - - - - -

Operating income (loss) - as adjusted $ 969 $ 53 $ (80) $ 942 $ 1,181 $ 98 $ (116) $ 1,163 $ 1,299 $ 125 $ (113) $ 1,311 $ 1,445 $ 111 $ (86) $ 1,470 $ 1,545 $ 237 $ (132) $ 1,650 $ 1,626 $ 676 $ (153) $ 2,149

Operating margin - adjusted 16.6% 5.9% 14.1% 18.4% 11.4% 16.1% 19.3% 15.2% 17.4% 21.1% 15.1% 19.4% 22.1% 15.3% 19.4% 21.6% 17.9% 19.0%Interest income 69 100 64 16 15 18 Interest expense (129) (138) (126) (122) (168) (245) Other income (expense) - as adjusted (13) 22 46 34 - 24

Income before income taxes - as adjusted $ 869 $ 1,147 $ 1,295 $ 1,398 $ 1,497 $ 1,946 Income taxes 283 361 358 380 433 531 Net income attributable to non-controlling interests 10 13 16 45 26 31

Income attributable to Aon stockholders - as adjusted $ 576 $ 773 $ 921 $ 973 $ 1,038 $ 1,384 Diluted earnings per share - as adjusted 1.69$ 2.37$ 3.02$ 3.34$ 3.48$ 4.06$ Weighted average common shares outstanding - diluted 345.8 326.9 304.5 291.1 298.1 340.9

RestatedRevenue, as adjusted $ 5,840 $ 892 $ (59) $ 6,673 $ 6,403 $ 860 $ (29) $ 7,234 $ 6,728 $ 825 $ (25) $ 7,528 $ 6,835 $ 737 $ 23 $ 7,595 $ 6,989 $ 1,545 $ (22) $ 8,512 $ 7,537 $ 3,781 $ (31) $ 11,287

Operating income (loss) - as adjusted $ 969 $ 53 $ (80) $ 942 $ 1,181 $ 98 $ (116) $ 1,163 $ 1,299 $ 125 $ (113) $ 1,311 $ 1,445 $ 111 $ (86) $ 1,470 $ 1,545 $ 237 $ (132) $ 1,650 $ 1,626 $ 676 $ (153) $ 2,149

1 1 - 2 14 (3) 2 13 38 2 - 40 (30) (1) 5 (26) (21) - 3 (18) 1 12 (3) 10 Operating income (loss) - as adjusted $ 968 $ 52 $ (80) $ 940 $ 1,167 $ 101 $ (118) $ 1,150 $ 1,261 $ 123 $ (113) $ 1,271 $ 1,475 $ 112 $ (91) $ 1,496 $ 1,566 $ 237 $ (135) $ 1,668 $ 1,625 $ 664 $ (150) $ 2,139

Operating margin - adjusted 16.6% 5.8% 14.1% 18.2% 11.7% 15.9% 18.7% 14.9% 16.9% 21.6% 15.2% 19.7% 22.4% 15.3% 19.6% 21.6% 17.6% 19.0%Interest income 69 100 64 16 15 18 Interest expense (129) (138) (126) (122) (168) (245)

Other income (expense) - as adjusted (13) 22 46 34 - 24

2 13 40 (26) (18) 10 Other income (expense) - as adjusted (11) 35 86 8 (18) 34

Income before income taxes - as adjusted $ 869 $ 1,147 $ 1,295 $ 1,398 $ 1,497 $ 1,946 Income taxes 283 361 358 380 433 531 Net income attributable to non-controlling interests 10 13 16 45 26 31

Income attributable to Aon stockholders - as adjusted $ 576 $ 773 $ 921 $ 973 $ 1,038 $ 1,384 Diluted earnings per share - as adjusted 1.69$ 2.37$ 3.02$ 3.34$ 3.48$ 4.06$ Weighted average common shares outstanding - diluted 345.8 326.9 304.5 291.1 298.1 340.9

Reclassification - Foreign currency remeasurement gains (losses)

Reclassification - Foreign currency remeasurement gains (losses)

17

Appendix D: Intangible Asset Amortization Schedule

Intangible Amortization by Segment

($ millions) 2009 2010 2011 2012 2013 2014 2015 2016 2017

Risk Solutions $93 $114 $129 $126 $115 $100 $85 $74 $61

HR Solutions - $40 $233 $297 $280 $243 $212 $177 $141

Total $93 $154 $362 $423 $395 $343 $297 $251 $202

Investor RelationsScott Malchowscott.malchow@aon.comOffice: +44 (0) 20 7086 0100

Erika Shouldiceerika.shouldice@aon.comOffice: 312-381-5957