AON CORP
10-Q, 1999-05-14
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

            X    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
            -       OF THE SECURITIES AND EXCHANGE ACT OF 1934

                  FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1999

                                       OR

            _   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                          Commission file number 1-7933

                                 Aon Corporation
                                 ---------------
             (Exact Name of Registrant as Specified in its Charter)

           DELAWARE                                   36-3051915
           --------                                   ----------
 (State or Other Jurisdiction of                    (IRS Employer
  Incorporation or Organization)                     Identification No.)



123 N. WACKER DR, CHICAGO, ILLINOIS                                60606
- - - - - - - - - - - - - - - - - -----------------------------------                                -----
(Address of Principal Executive Offices)                         (Zip Code)

               (312) 701-3000
               --------------
       (Registrant's Telephone Number)


Indicate  by check  mark  whether  the  Registrant:  (1) has filed  all  reports
required to be filed by Section 13 or 15(d) of the  Securities  and Exchange Act
of 1934  during the  preceding  3 months (or for such  shorter  period  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. YES  X   NO
                                              ---     ---

Number of shares of common stock outstanding:

                                                           No. Outstanding
                    Class                                   as of 3-31-99
                    -----                                   -------------
           $1.00 par value Common                            256,153,605
 (Adjusted to reflect a three-for-two stock split
   payable May 17, 1999 to stockholders of
            record on May 4, 1999)
<PAGE>
                                     Part 1
                              Financial Information
                                 Aon CORPORATION
             Condensed Consolidated Statements of Financial Position



 (millions)                                          AS OF           AS OF
                                                MARCH 31, 1999   DEC. 31, 1998
                                               -------------------------------
 ASSETS                                         (UNAUDITED)

 INVESTMENTS
   Fixed maturities at fair value                  $  2,790        $  3,103
   Equity securities at fair value                      708             768
   Short-term investments                             2,481           2,221
   Other investments                                    411             360
                                                 -----------------------------
     TOTAL INVESTMENTS                                6,390           6,452


 CASH                                                   927             723

 RECEIVABLES
   Insurance brokerage and consulting
        services                                      5,927           5,423
   Premiums and other                                 1,125           1,120
   Accrued investment income                             61              63
                                                 -----------------------------
     TOTAL RECEIVABLES                                7,113           6,606


 Intangible assets                                    3,594           3,500
  
 Other assets                                         2,460           2,407

                                                 -----------------------------
     Total Assets                                  $ 20,484        $ 19,688
                                                 =============================


                                                     AS OF           AS OF
                                                MARCH 31, 1999   DEC. 31, 1998
                                               -------------------------------
 LIABILITIES AND STOCKHOLDERS' EQUITY           (UNAUDITED)

 Insurance Premiums Payable                        $  7,470        $  6,948

 Policy Liabilities
   Future policy benefits                               997             986
   Policy and contract claims                           765             779
   Unearned and advance premiums                      1,766           1,797
   Other policyholder funds                           1,300           1,261
                                                 -----------------------------
     Total policy liabilities                         4,828           4,823

 General Liabilities
   General expenses                                   1,383           1,259
   Short-term borrowings                                929             844
   Notes payable                                        576             580
   Other liabilities                                  1,561           1,367
                                                 -----------------------------
     Total Liabilities                               16,747          15,821


 Commitments and Contingent Liabilities

 Redeemable Preferred Stock                              50              50

 Company-Obligated Mandatorily Redeemable
   Preferred Capital Securities of Subsidiary
   Trust holding solely the Company's Junior
   Subordinated Debentures                              800             800


 Stockholders' Equity
   Common stock - $1 par value                          258             172
   Paid-in additional capital                           451             450
   Accumulated other comprehensive loss                (245)           (116)
   Retained earnings                                  2,726           2,782
   Less - Treasury stock at cost                        (55)            (58)
          Deferred compensation                        (248)           (213)
                                                 -----------------------------
     Total Stockholders' Equity                       2,887           3,017

                                                 -----------------------------
     Total Liabilities and Stockholders' Equity    $ 20,484        $ 19,688
                                                 =============================

See the accompanying notes to the condensed consolidated financial statements.

                                     -  2  -
<PAGE>
<TABLE>
<CAPTION>
                                                     Aon Corporation
                                       Condensed Consolidated Statements of Income
                                                       (Unaudited)

                                                                                            First Quarter Ended
                                                                                   --------------------------------------
 (millions except per share data)                                                     March 31, 1999      March 31, 1998
                                                                                   ------------------  ------------------
<S>                                                                                          <C>                   <C>  
 REVENUE
    Brokerage commissions and fees                                                           $ 1,112             $   996
    Premiums and other                                                                           437                 417
    Investment income                                                                            150                 149
                                                                                             --------            --------
       Total revenue                                                                           1,699               1,562
                                                                                             --------            --------

 EXPENSES                                                                         
    General expenses                                                                           1,309               1,048
    Benefits to policyholders                                                                    239                 226
    Interest expense                                                                              21                  20
    Amortization of intangible assets                                                             34                  30
                                                                                             --------            --------
       Total expenses                                                                          1,603               1,324
                                                                                             --------            --------

 INCOME BEFORE INCOME TAX AND MINORITY INTEREST                                                   96                 238
    Provision for income tax                                                                      36                  89
                                                                                             --------            --------
 INCOME BEFORE MINORITY INTEREST                                                                  60                 149
    Minority interest - 8.205% trust preferred capital securities                                (10)                (10)
                                                                                             --------            --------
 NET INCOME                                                                                  $    50             $   139
                                                                                             ========            ========
    Preferred stock dividends                                                                     (1)                 (1)
                                                                                             --------            --------
 NET INCOME AVAILABLE FOR COMMON STOCKHOLDERS                                                $    49             $   138
                                                                                             ========            ========

 NET INCOME PER SHARE (1):                                                        
    Basic net income per share                                                               $  0.19             $  0.55
                                                                                             ========            ========
    Dilutive net income per share                                                            $  0.19             $  0.53
                                                                                             ========            ========
 Cash dividends paid on common stock (1)                                                     $  0.19             $  0.17
                                                                                             ========            ========

 Dilutive average common and common equivalent shares outstanding (1)                          261.8               257.1
                                                                                             --------            --------


<FN>
(1)   Reflects the three-for-two stock split effective May 4, 1999.
</FN>
</TABLE>

  See the accompanying notes to the condensed consolidated financial statements.

                                     -  3  -
<PAGE>
<TABLE>
<CAPTION>
                                 Aon CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)


                                                                                      First Quarter Ended
                                                                              --------------------------------------
                                                                                 March 31,            March 31,
 (millions)                                                                        1999                 1998
                                                                              -----------------   ------------------

<S>                                                                                     <C>                  <C>  
 CASH PROVIDED BY OPERATING ACTIVITIES ..................................             $   263              $   256

 CASH FLOWS FROM INVESTING ACTIVITIES:                                   
   Sale of investments                                                   
        Fixed maturities
            Maturities ..................................................                  14                   27
            Calls and prepayments .......................................                  49                   18
            Sales .......................................................                 601                1,310
        Equity securities ...............................................                 176                1,101
        Other investments ...............................................                  22                   33
   Purchase of investments ..............................................
        Fixed maturities ................................................                (387)              (1,233)
        Equity securities ...............................................                (181)              (1,011)
        Other investments ...............................................                 (44)                 (40)
  Purchase of short-term investments - net ..............................                (258)                (431)
  Acquisition of subsidiaries ...........................................                (102)                 (96)
  Property and equipment and other ......................................                 (41)                 (43)
                                                                                      --------             --------
            CASH USED BY INVESTING ACTIVITIES ...........................                (151)                (365)
                                                                                      --------             --------

 CASH FLOWS FROM FINANCING ACTIVITIES:                         
    Treasury stock transactions - net ...................................                  (1)                  12
    Issuance (repayment) of short-term borrowings - net .................                 125                  (89)
    Repayment of long-term debt .........................................                  (5)                 (19)
    Interest sensitive life, annuity and investment contracts ...........
        Deposits ........................................................                 103                  187
        Withdrawals .....................................................                 (81)                 (18)
    Cash dividends to stockholders ......................................                 (48)                 (44)
                                                                                      --------             --------
            CASH PROVIDED BY FINANCING ACTIVITIES .......................                  93                   29
                                                                                      --------             --------

 EFFECT OF EXCHANGE RATE CHANGES ON CASH ................................                  (1)                   5
 INCREASE (DECREASE) IN CASH ............................................                 204                  (75)
 CASH AT BEGINNING OF PERIOD ............................................                 723                1,085
                                                                                      ========             ========
 CASH AT END OF PERIOD ..................................................             $   927              $ 1,010
                                                                                      ========             ========
</TABLE>


 See the accompanying notes to condensed consolidated financial statements.


                                     -  4  -   
<PAGE>

NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS


1.    Statement of Accounting Principles
      ----------------------------------

      The  financial  results  included in this report are stated in  conformity
      with  generally  accepted  accounting  principles  and are  unaudited  but
      include all normal  recurring  adjustments  which the  Registrant  ("Aon")
      considers  necessary  for a fair  presentation  of the  results  for  such
      periods.  These interim figures are not necessarily  indicative of results
      for a full year as further discussed below.

      Refer to the  consolidated  financial  statements  and notes in the Annual
      Report to Stockholders for the year ended December 31, 1998 for additional
      details  of Aon's  financial  position,  as well as a  description  of the
      accounting policies which have been continued without material change. The
      details  included  in the  notes  have not  changed  except as a result of
      normal  transactions  in the  interim  and  the  events  mentioned  in the
      footnotes below.

      Certain  prior  period  amounts have been  reclassified  to conform to the
      current period presentation.


2.    Stock Split
      -----------

      On March 19,  1999,  Aon's board of directors  authorized a  three-for-two
      stock split,  payable in the form of a stock dividend of one share payable
      for every two shares  held,  of Aon's $1.00 par value common  stock,  with
      approximately 86 million shares payable on May 17, 1999 to stockholders of
      record on May 4, 1999. The stock split has been retroactively reflected in
      the March 31, 1999 condensed consolidated statement of financial position,
      (but not the December 31, 1998), by increasing common stock and decreasing
      additional   paid-in-capital  by  $86  million.   All  references  in  the
      accompanying  financial  statements to the number of common shares and per
      share amounts have been retroactively restated to reflect the stock split.


3.    Comprehensive Income
      --------------------

      Comprehensive  income is computed in accordance with Financial  Accounting
      Standards Board (FASB) Statement No. 130 (Reporting  Comprehensive Income)
      and is calculated as follows:

      The components of comprehensive income (loss), net of related tax, for the
      first quarter ended March 31, 1999 and 1998 are as follows:

            (millions)                                  1999           1998
                                                       ------         ------

            Net income                                 $   50         $  139
            Net unrealized investment losses              (63)            (7)
            Net foreign exchange gains (losses)           (66)             2
                                                       -------        -------
            Comprehensive income (loss)                $  (79)        $  134
                                                       =======        =======
                                     -  5  -
<PAGE>
      The components of accumulated  other comprehensive loss,  net  of  related
      tax, at March 31, 1999 and December 31, 1998, are as follows:

            (millions)                                  1999           1998
                                                       ------         ------

            Net unrealized investment gains            $   15         $   78
            Net foreign exchange losses                  (164)           (98)
            Net  minimum pension liability                               
               adjustment                                 (96)           (96)
                                                       -------        -------
            Accumulated other comprehensive loss       $ (245)        $ (116)
                                                       =======        =======


4.    Business Segments
      -----------------

      In fourth quarter 1998, Aon adopted Financial  Accounting  Standards Board
      (FASB)  Statement No. 131 (Disclosure  about Segments of an Enterprise and
      Related  Information).   Beginning  in  1999,  all  prior  period  segment
      information is restated to conform to the current period presentation. Aon
      classifies its businesses into three major operating  segments:  Insurance
      Brokerage and Other Services,  Consulting and Insurance Underwriting;  and
      into one non-operating segment, Corporate and Other.

      All  intercompany  revenues  and  expenses  are  eliminated  in  computing
      consolidated revenues and income before income tax.

      In accordance with the interim period reporting  requirements of Statement
      No. 131, the segment information located in the tables on pages 11 through
      13 is incorporated herein by reference.

      Amounts  reported in the tables for the four  segments,  when  aggregated,
      total to the amounts in the accompanying  condensed consolidated financial
      statements.


5.    Capital Stock
      -------------

      During first quarter  1999,  Aon reissued  798,500  shares of common stock
      from treasury for employee  benefit plans and 333,500 shares in connection
      with the employee stock purchase plan. Aon purchased 665,500 shares of its
      common stock at a total cost of $27.2  million  during first quarter 1999.
      There were 1.8  million  shares of common  stock held in treasury at March
      31, 1999.



6.    Capital Securities
      ------------------

      In 1997, Aon Capital A, a subsidiary  trust of Aon, issued $800 million of
      8.205%  mandatorily   redeemable  preferred  capital  securities  (capital
      securities).  The sole asset of Aon  Capital A is $824  million  aggregate
      principal amount of Aon's  8.205%  Junior Subordinated Deferrable Interest
      Debentures due January 1, 2027.

                                     -  6  -
<PAGE>

7.    Special Charges
      ---------------

      In first quarter 1999, Aon recorded  special charges of $163 million ($102
      million  after  tax  or  $0.39  per  share),   including   provisions  for
      restructuring  and  pension  misselling.  These  charges  are included  in
      general expenses in the condensed consolidated statements of income.

      Total  severance and related  pension  expenses,  involving 900 positions,
      were $99 million. Of the $99 million, approximately $32 million represents
      benefits  related to pension  plans and is included in Aon's total pension
      liability.   Workforce   reductions  are  related  to  a  voluntary  early
      retirement  plan  for  employees  of Aon's  U.S.  and  Canadian  operating
      subsidiaries,  as well as the  consolidation  of Aon's European  insurance
      brokerage and other services operations,  primarily in the United Kingdom.
      As of March 31, 1999, approximately  $20  million has been paid related to
      650  employees terminated.  The  remaining  payments on these terminations
      and the remaining terminations plan to be paid within one year.

      In the consulting  segment,  special charges of approximately  $43 million
      were recorded to reflect  Aon's  ability to clarify and  quantify,  in the
      first quarter 1999, amounts required to make redress payments to customers
      who purchased  private  pension plans in the United Kingdom  several years
      ago. These amounts are  anticipated to be paid primarily over the next two
      years.  Aon's ultimate  exposure  from the private pension plan review, as
      presently  calculated,  is  subject  to  a  number   of  variable  factors
      including,  among  others,  equity  markets,  the  rate of response to the
      pension review mailings, the interest  rate  established  quarterly by the
      U.K.  Pension Investment Authority  for calculating  compensation, and the
      precise scope, duration, and methodology of the review.

      The  remaining  charges  of  $21   million  primarily  reflect  the  lease
      abandonments  relating  to   the  consolidation  of   worldwide  brokerage
      operations, and other exit activities. 

      
8.    Income Per Share
      ----------------

      Income per share is computed in  accordance  with FASB  Statement  No. 128
      (Earnings Per Share) and is calculated as follows:

                                                       First Quarter Ended
                                                --------------------------------
           (millions except per share data)     March 31, 1999   March 31, 1998
           ---------------------------------------------------------------------

           Net income                               $    50             $   139
           Redeemable preferred stock dividends           1                   1
                                                    ----------------------------
           Net income  for dilutive and basic       $    49             $   138
                                                    ============================

           Basic shares outstanding                     258                 253
           Common stock equivalents                       4                   4
                                                    ----------------------------
           Dilutive potential common shares             262                 257
           ---------------------------------------------------------------------
           Basic net income per share               $  0.19             $  0.55
           Dilutive net income per share            $  0.19             $  0.53
           =====================================================================

                                     -  7  -
<PAGE>

9.    Alexander & Alexander Services Inc. (A&A) Discontinued Operations
      -----------------------------------------------------------------

      A&A  discontinued its insurance  underwriting  operations in 1985, some of
      which were then placed into run-off,  with the remainder  sold in 1987. In
      connection with those sales, A&A provided indemnities to the purchaser for
      various estimated and potential liabilities, including provisions to cover
      future losses attributable to insurance pooling arrangements,  a stop-loss
      reinsurance  agreement,  and actions or omissions by various  underwriting
      agencies  previously  managed by an A&A subsidiary.  As of March 31, 1999,
      the liabilities  associated with the foregoing indemnities and liabilities
      of insurance underwriting  subsidiaries that are currently in run-off were
      included in other liabilities in the accompanying  condensed  consolidated
      statement  of  financial  position  and  amounted  to $148  million.  Such
      liabilities are net of reinsurance  recoverables  and other assets of $184
      million.


10.   Contingencies
      -------------

      Aon and its subsidiaries  are subject to numerous claims,  tax assessments
      and lawsuits  that arise in the ordinary  course of business.  The damages
      that may be claimed are  substantial,  including in many instances  claims
      for punitive or extraordinary damages.  Accruals for these items have been
      provided to the extent that losses are deemed probable and are estimable.

      In the fourth  quarter of 1998, Aon received an Internal  Revenue  Service
      (IRS) revenue  agent's  report (RAR)  proposing  adjustments to the tax of
      certain Aon subsidiaries for the period 1990 through 1993. In the RAR, the
      IRS has contended  that  retro-rated  extended  warranty  contracts do not
      constitute insurance for tax purposes. Accordingly, the IRS has proposed a
      deferral of deductions for obligations  under those contracts.  The effect
      of such  deferral  would be to increase  the current  tax  obligations  of
      certain Aon  subsidiaries by  approximately  $74 million,  $3 million,  $5
      million and $12 million  (plus  interest)  in years 1990,  1991,  1992 and
      1993,  respectively.  Aon believes  that the IRS's  position in the RAR is
      without merit and inconsistent  with numerous  previous IRS private letter
      rulings. Aon has commenced an administrative appeal and intends to contest
      vigorously such  treatment.  Aon believes that if the contracts are deemed
      not to be insurance for tax  purposes,  they would be  recharacterized  as
      such a way that the increased taxes for the years in question would be far
      less  than  the  proposed  assessments.  In the  same  RAR,  a  number  of
      additional  items were  identified  which would also  increase  the tax of
      other Aon  subsidiaries  for 1990 through  1993.  Aon believes  that these
      additional  items should be resolved  through  factual  substantiation  of
      certain  accounting  matters.  Aon further believes that the settlement of
      these issues will not have a material impact on its financial position.

      
      Although the ultimate  outcome of these suits  cannot be  ascertained  and
      liabilities  in  indeterminate  amounts  may  be  imposed  on  Aon  or its
      subsidiaries,  on  the  basis  of  present  information,  availability  of
      insurance coverages and advice received from counsel, it is the opinion of
      management that the disposition or ultimate  determination  of such claims
      will not have a  material  adverse  effect on the  consolidated  financial
      position of Aon.

                                     -  8  -
<PAGE>
                                 Aon CORPORATION
                  MANAGEMENT'S ANALYSIS OF OPERATING RESULTS
                           AND FINANCIAL CONDITION

                     REVENUE AND INCOME BEFORE INCOME TAX
                            FOR FIRST QUARTER 1999


CONSOLIDATED RESULTS
- - - - - - - - - - - - - - - - - --------------------

INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS
- - - - - - - - - - - - - - - - - -------------------------------------------------

This  quarterly  report  contains  forward-looking  statements  relating to such
matters as future financial performance,  the business of Aon and Year 2000. The
Private  Securities  Litigation  Reform Act of 1995  provides a safe  harbor for
forward-looking  statements.  These  forward-looking  statements  are subject to
certain  risks and  uncertainties  that  could  cause  actual  results to differ
materially from historical results or those anticipated,  depending on a variety
of factors  such as changes  in  worldwide  and  national  economic  conditions,
fluctuations  in foreign  currencies,  changes in  securities  and fixed  income
markets,  unpredictability  and timing and amounts of returns on private  equity
holdings,  downward commercial property and casualty premium pressures,  and the
competitive environment.  In addition, Aon notes that a variety of factors could
cause Aon's actual results and experience  relating to compliance with Year 2000
to  differ  materially  from  the  anticipated  results  or  other  expectations
expressed in Aon's forward-looking statements concerning Year 2000 issues. These
factors include (i) the  unanticipated  material impact of a system fault of Aon
relating to Year 2000, (ii) the failure to successfully  remediate,  in spite of
testing,  material  systems of Aon,  (iii) the time it may take to  successfully
remediate a failure once it occurs,  as well as the resulting  costs and loss of
revenues,  and (iv) the failure of third parties to properly  remediate material
Year 2000 problems.

GENERAL
- - - - - - - - - - - - - - - - - -------

Special  charges  information  located in note 7 to the  condensed  consolidated
financial statements is incorporated herein by reference.

Brokerage  commissions  and fees  increased $116 million or 12% in first quarter
1999, primarily reflecting post-first quarter 1998 business combination activity
and internal growth.

Premiums and other is primarily  related to insurance  underwriting  operations.
Premiums and other  increased $20 million or 5% in first quarter 1999,  compared
with the same period last year.  Extended warranty premiums earned increased $11
million or 8% in the quarter,  primarily  reflecting new business development in
the  international  appliance  and  electronics  warranty  lines.  Direct  sales
premiums  earned  increased  3%  reflecting  the  introduction  of  several  new
products,  growth in worksite marketing, and geographic expansion. The runoff of
North  American auto credit  business  partially  offset this growth in premiums
earned.

Investment  income,  which  includes  related  expenses and income on disposals,
increased  a modest 1% in the first  quarter  1999 when  compared to prior year.
Growth  derived  from  the  sales  of  tax-exempt  bonds  of  approximately  $30
million was partially  offset by lower levels of income from private  equity and
other  investment  holdings in the quarter.  Investment  income  from  insurance
brokerage and other services, and consulting  operations,  primarily relating to
fiduciary  funds,  decreased $3 million and $1 million,  respectively,  in first
quarter 1999 compared to first quarter 1998.

                                     -  9  -
<PAGE>
Total revenue  increased  $137 million or 9% in first  quarter  1999,  primarily
attributable  to post first  quarter  1998  brokerage  acquisition  activity and
internal growth in the operating segments.

Benefits to  policyholders  increased  $13 million or 6% in first  quarter 1999.
Contributing  to this increase was a higher volume of capital  accumulation  and
new  extended  warranty  business.  This  increase was  partially  offset by the
run-off of auto credit business as planned.

Total expenses increased $279 million or 21% in first quarter 1999 when compared
to prior year.  The first quarter 1999  increase  reflects the inclusion of 1999
pretax special  charges.  Total  expenses,  excluding the 1999 special  charges,
increased 9% for the quarter when compared to 1998.  First quarter 1999 expenses
increased  over  prior  year  primarily  due  to  investments  in  new  business
initiatives,  technology and product development.  Restructuring liabilities for
recent  acquisitions  and 1999 special  charges have been reduced by payments as
planned.

References to income before income tax are before minority  interest  related to
the  issuance of 8.205%  mandatorily  redeemable  preferred  capital  securities
(capital securities).

Income  before  income tax  decreased  $142 million or 60% in first quarter 1999
when  compared to prior year,  primarily  due to the  inclusion  of 1999 special
charges.  Excluding  special  charges,  income  before  income tax increased $21
million or 9% in first quarter 1999 when compared to prior year,  largely due to
growth in the insurance  brokerage and other  services and  consulting  segments
related  to  business  combination  activity  in 1999 and  1998 and to  internal
growth.  Total  annualized  cost savings are projected to be  approximately  $50
million from the special charges taken in first quarter 1999.


BUSINESS SEGMENTS
- - - - - - - - - - - - - - - - - -----------------

GENERAL
- - - - - - - - - - - - - - - - - -------

For purposes of the following business segments discussions, comparisons against
1998 results exclude  discontinued  operations and special charges. In addition,
references to income before income tax exclude minority  interest related to the
capital securities.

A review of financial performance for each of the four business segments follow.


INSURANCE BROKERAGE AND OTHER SERVICES
- - - - - - - - - - - - - - - - - --------------------------------------

The Insurance Brokerage and Other Services segment consists principally of Aon's
retail, reinsurance, specialty and wholesale brokerage operations.

First  quarter 1999  Insurance  Brokerage  and Other  Services  revenue was $997
million, up 12%. Post-first quarter 1998 acquisitions as well as internal growth
accounted  for the  majority of this  revenue  growth.  Excluding  the impact of
acquisitions, revenue related to brokerage core businesses grew approximately 5%
in a very competitive environment.

                                     -  10  -
<PAGE>

- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Insurance Brokerage and Other Services
(millions)          First quarter ended March 31          1999        1998
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Revenue:
   United States                                      $    483    $    412
   United Kingdom                                          189         185
   Europe                                                  225         177
   Rest of World                                           100         116
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Total revenue                                         $    997    $    890
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------


Income before income tax
   excluding special charges                          $    184    $    168
Special charges                                            119           -
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Income before income tax                              $     65    $    168
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------

U.S.  revenue of $483 million in 1999 was up 17% from 1998, while United Kingdom
and European revenue of $414 million  increased 14% from 1998,  primarily due to
acquisition  activity.  Rest of world revenue  declined in 1999 primarily due to
the impact of foreign exchange rates.

Insurance  Brokerage and Other Services segment results were impacted positively
by  acquisitions,  in particular the Le Blanc and AIS acquisitions in second and
third quarter 1998, respectively.  Retail brokerage results continued to reflect
competitive property and casualty pricing. Pretax income, excluding 1999 special
charges,  grew 10% over 1998, due to both internal  growth and to  acquisitions.
Investments in new initiatives, with little or no immediate revenue growth, also
impacted  revenue and pretax  income  results.  Pretax  margins in this  segment
declined slightly in 1999, reflecting market-pricing pressures.


CONSULTING
- - - - - - - - - - - - - - - - - ----------

The  consulting  segment  provides  a full  range of  employee  benefits,  human
resources, compensation, and change management services.

In the  Consulting  segment,  first  quarter 1999  revenue  increased 4% to $156
million. Revenue growth was influenced by acquisition  activity and divestitures
subsequent to first  quarter 1998.

- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Consulting
(millions)         First quarter ended March 31           1999        1998
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Revenue:
   United States                                      $     91    $     87
   United Kingdom                                           34          31
   Europe                                                   16          13
   Rest of World                                            15          19
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Total revenue                                         $    156    $    150
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------


Income before income tax                              
     excluding special charges                        $     17    $     15
Special charges                                             44           -
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------
Income before income tax                              $    (27)   $     15
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------

                                     -  11  -
<PAGE>

U.S.  revenue  of  $91 million in 1999 was up 5% from 1998.  United  Kingdom and
European revenue of $50 million increased 14%  from 1998.  The impact of foreign
exchange  rates contributed  to a $4  million  decline in rest of world revenues
when compared to prior year. 

Pretax  income,  excluding  special  charges,  increased to $17 million from $15
million in first quarter 1998, a 13% increase.


INSURANCE UNDERWRITING
- - - - - - - - - - - - - - - - - ----------------------

The  Insurance  Underwriting  segment  is  comprised  of direct  sales  life and
accident and health, warranty, specialty and other insurance products.


- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Insurance Underwriting
(millions)         First quarter ended March 31         1999       1998
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Revenue:
   Direct sales                                      $   265   $    258
   Extended warranty                                     173        159
   Specialty and other                                    59         58
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Total revenue                                        $   497   $    475
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Income before income tax                             $    64   $     65
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------


Revenue was $497 million in first quarter  1999, up 5% from 1998,  primarily due
to growth in the  international  electronic  and  appliance lines.  Direct sales
continued to expand its  product   distribution   through  work-site   marketing
programs and the introduction of new product initiatives.  Auto credit  business
continues to runoff.


- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Insurance Underwriting
(millions)          First quarter ended March 31        1999         1998
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Revenue:
   United States                                  $      342  $       337
   United Kingdom                                         82           68
   Europe                                                 30           26
   Rest of World                                          43           44
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Total revenue                                     $      497  $       475
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------

U.S.  revenue of $342  million  was up 1% in first  quarter 1999 principally due
to growth  in revenues for  capital  accumulation products.  United  Kingdom and
European revenue of $112 million rose 19%, primarily reflecting a higher  volume
of new  business in the  appliance  and electronic extended warranty lines. Rest
of world revenue was $43 million, down slightly from prior year.

                                     -  12  -
<PAGE>

Pretax  income was $64 million in first  quarter  1999,  down  slightly from $65
million last year, primarily due to the run-off of auto credit business.  Higher
expense  ratios  associated  with  start-up  costs  related to new direct  sales
product  initiatives and investments in new product  development in the extended
warranty  lines  partially  contributed  to the modest  decline in pretax income
results in first quarter  1999.  Overall,  benefit and expense  margins in first
quarter 1999 did not suggest any significant shift in operating trends.


CORPORATE AND OTHER
- - - - - - - - - - - - - - - - - -------------------

Revenue in this  category  consists  primarily of investment  income  (including
income on disposals) which is not otherwise allocated to the operating segments.
Corporate  operating  expenses include  administrative  and certain  information
technology costs.

- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Corporate and Other
(millions)            First quarter ended March 31    1999           1998
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Total revenue                                      $    49        $    47
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------
Loss before income tax                             $    (6)       $   (10)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------


Corporate  and  Other revenue for the first quarter 1999 was $49  million, up $2
million  from  the  first  quarter  1998.  Lower  revenue  from  private  equity
investments  was more than offset by  aprroximately  $30  million  of  gain from
disposal of $500 million in tax-exempt bonds.The timing of revenues from private
equity  investments varies significantly between periods.  The goal is long-term
yields from private equities which exceed long-term  security market rates.  The
sale of these  bonds (and the reinvestment of proceeds in  foreign source income
securities) was  part  of  a  program  designed  to  enable Aon to fully utilize
foreign tax credits.  The switch from tax-free to  taxable  bonds  will increase
Aon's effective tax rate by about a point.  The increased yield should allow Aon
to maintain after-tax investment results despite higher taxes.

The bonds were sold by Aon's insurance  underwriting subsidiaries.  However, the
gain on the bonds was recorded in Corporate and Other  revenue, in keeping  with
past practice, in order to provide better period to period comparability for the
insurance underwriting segment. Dividend and interest income from the securities
purchased with those  proceeds will be recorded in  the  insurance  underwriting
segment.

Corporate and Other  expenses for the quarter were $55 million,  down $2 million
from the same period last year. They are composed of interest expense,  goodwill
amortization and general expenses.  Interest  expense and  goodwill amortization
were up a total of $5  million  over  the  first  quarter  1998,  reflecting the
financing  of acquisitions  made during the last twelve months. General expenses
were down somewhat, in line with expectations.

The Corporate and Other pretax loss was $6 million in the quarter, a $4  million
improvement over last year.

                                     -  13  -
<PAGE>

                      NET INCOME FOR FIRST QUARTER 1999


References  to share data  reflect the  three-for-two  stock split  announced on
March 19, 1999,  payable on May 17, 1999 to  stockholders of record as of May 4,
1999.  First quarter 1999 net income was $50 million ($0.19  dilutive per share)
compared to $139 million ($0.53 dilutive per share) in 1998.  First quarter 1999
net income was primarily  influenced by after-tax  1999 special  charges of $102
million ($0.39 per share) with no comparable amount in first quarter 1998. Basic
net income per share,  including  1999 special  charges,  was $0.19 and $0.55 in
first quarter 1999 and 1998, respectively. Dividends on the redeemable preferred
stock have been deducted from net income to compute income per share.

The effective tax rate was 37.5% for both first quarter 1999 and 1998.  Dilutive
average shares  outstanding for first quarter 1999 increased 2% when compared to
1998 primarily due to the reissuance of common shares from treasury for employee
benefits.



                       CASH FLOW AND FINANCIAL POSITION
                       AT THE END OF FIRST QUARTER 1999

Cash flows provided  by operating  activities in  first quarter 1999  were  $263
million,  an increase  of  $7  million  from  first  quarter 1998.  The increase
primarily  represents growth in the insurance brokerage businesses and is offset
in  part by the timing of the settlement of  brokerage receivables and payables.

Investing  activities  used cash of $151 million,  which was made available from
financing and operating  activities.  Cash of $258 million was used during first
quarter  1999  for  the  purchase  of  short-term  investments.  Cash  used  for
acquisition  activity  during  first  quarter 1999 was $102  million,  primarily
reflecting brokerage acquisitions.

Cash totaling $93 million was provided during first quarter 1999 from  financing
activities.  The increase of $64 million  from first  quarter 1998  is primarily
due to the issuance of short-term borrowings for acquisitions.  Cash was used to
pay  dividends  of  $47  million  on  common stock and  $1 million on redeemable
preferred stock during first quarter 1999.

Aon's operating subsidiaries anticipate that there will be adequate liquidity to
meet their needs in the foreseeable future.  Aon's liquidity needs are primarily
for  servicing  its debt and for the payment of  dividends  on stock  issues and
capital securities.  The businesses of Aon's operating  subsidiaries continue to
provide  substantial  positive  cash  flow.  Brokerage  cash  flow has been used
primarily  for  acquisition  financing.  Aon  anticipates  continuation  of  the
company's  positive  cash flow,  the  ability  of the  parent  company to access
adequate short-term lines of credit, and sufficient cash flow in the long term.

Due to the contractual  nature of its insurance  policyholder  liabilities which
are  intermediate  to long-term in nature,  Aon has invested  primarily in fixed
maturities.  With a carrying  value of $2.8 billion,  Aon's total fixed maturity
portfolio is  invested  primarily in investment  grade holdings (94%) and  has a
fair value which is 102% of amortized cost.

                                     -  14  -
<PAGE>

Total  assets  increased  $796 million to $20.5  billion  since  year-end  1998.
Invested  assets at March 31, 1999  decreased $62 million from year-end  levels,
primarily  reflecting the disposal of $500 million  tax-exempt bonds.  Partially
offsetting this decrease was higher levels of short-term investments relating to
brokerage  fiduciary  funds.  The  amortized  cost and  fair value of less  than
investment  grade fixed  maturity  investments,  at  March  31, 1999,  were $162
million  and $156  million,  respectively.  The  carrying  value  of  non-income
producing  investments in Aon's portfolio at  March 31, 1999 was $54 million, or
1% of total invested assets.

Aon uses derivative financial instruments  (primarily financial futures,  swaps,
options  and  foreign   exchange   forwards)  to:  (a)  hedge  foreign  currency
translation and transaction  risks and other business risks (i.e.  interest rate
and  credit  risk);  (b)  hedge  asset  price  risk  associated  with  financial
instruments whose change in value is reported under SFAS 115; and (c) manage its
overall  asset/liability  duration  match.  As of March 31,  1999,  Aon had open
contracts, related to the above, which had unrealized losses of approximately $6
million.

Insurance brokerage and consulting services  receivables  increased $504 million
when  compared to year-end  1998.  Insurance  premiums  payable  increased  $522
million in first quarter 1999, reflecting acquisitions and the receipt of client
fiduciary funds.

Short-term  borrowings increased at the end of first quarter 1999 by $85 million
when compared to year-end  1998.  The increase is primarily due to the financing
of acquisitions.  Notes payable decreased at the end of first quarter 1999 by $4
million when compared to year-end  1998.  Included in notes payable at March 31,
1999 is  approximately  $120 million,  which  represents the principal amount of
notes due within one year. Of this amount, approximately $100 million represents
Aon's 6.875% debt  securities,  due October 1, 1999, which are anticipated to be
redeemed at 100% of the principal amount plus accrued interest.

Stockholders'  equity decreased $130 million in first quarter 1999 to $11.27 per
share, a decrease of $0.56 per share since year-end 1998. The principal  factors
influencing  this  decrease were the $102 million of after-tax  special  charges
which reduced net income, net unrealized  investment losses of $63 million,  net
foreign  exchange  losses of $66 million and dividends to  stockholders  of $101
million.  Unrealized investment gains and losses and foreign  exchange gains and
losses  fluctuations  from  period  to  period  are   largely  based  on  market
conditions.  These short-term non-cash fluctuations are not economical to hedge.
Included  in the  reduction  for dividends is an accrual  for the second quarter
1999 common stock dividend.


                      YEAR 2000 READINESS DISCLOSURE 


Aon's State of Readiness
- - - - - - - - - - - - - - - - - ------------------------
Aon is  affected  by both  its own  computer  information  systems  and by third
parties  with which it has business  relationships,  in the  processing  of data
relating to the Year 2000 and beyond.  Aon began work on the computer  Year 2000
issue  in  1995 and  expects to  complete substantially  all  of its  efforts by
mid-1999.  In 1997, Aon designated a full-time Year 2000 project coordinator who
established Aon's Year 2000 project office to monitor the progress of and act as
a central contact for its major business units worldwide.Year 2000 efforts under
the direction of the Aon Executive Vice President of Business Systems  Solutions
are focused primarily on two areas: internal systems readiness and  readiness of
carriers with whom Aon places insurance business on behalf of its clients.

                                     -  15  -
<PAGE>

Information Technology (IT)
- - - - - - - - - - - - - - - - - ---------------------------
In a  corporate-wide  Year 2000  readiness  analysis  completed  in early  1998,
individual  business units were required to formally  develop plans,  where they
had not already done so, to achieve Year 2000  compliance,  and to provide their
plans to the  project  office.  Each  plan  consisted  of an  evaluation  of the
compliance  status of  internal  IT systems  and an  identification  of specific
hardware and software compliance issues. As a result of this effort, the project
office is  currently  tracking  over 200  worldwide  business  unit plans.  Each
business  unit is required to report its progress  against its plan on a monthly
basis to the project office. It is each business unit's responsibility to ensure
that adequate testing of systems is performed to ensure Year 2000 functionality.

The original readiness target date to remediate or replace most mission critical
applications  was  December 31, 1998,  with  substantially  all  business  units
expected to be fully compliant by mid-1999.  Testing on some of these systems is
continuing  into the first half of 1999. Business units have made good  progress
and are well along in the process of replacing or modifying  applications  found
to be  non-compliant. During  January 1999, a business unit readiness review and
risk  assessment for each business unit was  performed.  Dates were  established
for internal  audit reviews of test  documentation for selected units.  Business
units were put on a watch list if any mission  critical application replacement,
remediation,  or testing  seemed to have a material risk of extending into third
quarter 1999.  Contingency  plans are required  for  business units with mission
critical systems on the watch list. An analysis of all  newly acquired  business
units is completed immediately after acquisition and appropriate  plans  are put
into action.

Progress and concerns are reported to Aon's senior and business unit management.
A written  report is being  prepared for management for any business unit with a
mission  critical  application  on the watch list.  These  applications  will be
tracked by the 2000 program office and reported to management monthly.

Non-IT
- - - - - - - - - - - - - - - - - ------
With  respect to non-IT  issues,  a project  coordinator  is working  with Aon's
facilities  management  and third  party  leasing  management  company to ensure
premises  issues are addressed in Aon-owned and leased  properties in the United
States. Outside of the U.S., local chief financial officers have been instructed
to make similar  inquiries.  The results of these efforts were reviewed for U.S.
and European  locations as of December 31, 1998. Some relatively  minor problems
were uncovered and are in the process of being fixed. The majority of the issues
were with personal computer-based facility management systems.

Aon has some risk on a  location  by  location  basis  related  to the  possible
failure  of   government   agencies,   public   utilities   and   providers   of
telecommunication  and  transportation  services.  Due to  Aon's  dispersion  of
facilities,  the largest  concentrated  risks in this regard are in the Chicago,
New York and London locations.


Third Parties
- - - - - - - - - - - - - - - - - -------------
Third parties having a material  relationship  with Aon have Year 2000 issues to
address and resolve.  Such third parties primarily include issuers of investment
securities,  financial  institutions,  governmental agencies,  telecommunication
companies, and insurance carriers. An aspect of the project is to identify these
third parties and contact them to seek written assurance as to the third party's
anticipation of being Year 2000 compliant. The nature of Aon's follow-up depends
upon its  assessment  of the  response and of the  materiality  of the effect of
non-compliance by third parties on Aon.  Significant third parties determined to
be at risk for Year 2000 failure will be reported to appropriate  Aon management
for possible  preemptive action to minimize adverse impact on  Aon's operations.
As of December 31, 1998, Aon is not aware of any  significant third party with a
Year 2000 issue that would materially impact Aon's

                                     -  16  -
<PAGE>

results  of  operations, liquidity,  or capital  resources.  However, Aon has no
means of ensuring that such third parties will be Year 2000 ready. The inability
of third  parties to  complete their  Year 2000 remediation  process in a timely
fashion  could  materially  impact Aon.  The  effect  of non-compliance by third
parties is not determinable.

Aon is compiling information on and assessing the compliance status of insurance
carriers  with whom it places  business  on  behalf of its  clients.  Compliance
questionnaires  have been sent to  approximately  2,700 carriers  worldwide.  An
intensive  follow-up  effort,  focusing on U.S. carriers who receive the bulk of
insurance  placements by U.S.  business  units,  has produced a response rate of
close to 100%.  Progress  updates on these  carriers are in progress.  A similar
update  effort  for  significant  non-U.S. carriers being executed in  London is
targeted for completion by June 30, 1999.

Costs to Address Aon's Year 2000 Issues
As of December  31,  1998,  Aon's Year 2000  remediation  costs for all business
units were projected to be  approximately $70 million through December 31, 1999.
These costs are being funded through business unit operating cash flows.

As of March 31, 1999, Aon has incurred  approximately $53 million related to all
phases  of  the  Year  2000  project.  Of the  total  remaining  project  costs,
approximately  $17  million  will be incurred  and  expensed in second and third
quarter 1999.


Risks of Aon's Year 2000 Issues
Aon's  management  believes it has an effective  program in place to resolve the
Year 2000 issue in a timely  manner.  As noted above,  Aon has not yet completed
all necessary Year 2000 program activities for all mission critical applications
for all 200 business units being tested. In addition,  disruption in the economy
generally resulting from Year 2000 issues could also materially adversely affect
Aon.  The  amount  of  potential  liability  and lost  revenue  related  to that
disruption  cannot  be  reasonably  estimated  at  this  time.  With  regard  to
non-compliance  resulting  from Aon's IT systems,  Aon will devote its financial
and personnel  resources to remediate problems as soon as detected.  With regard
to non-compliance  resulting from third party failure,  Aon is in the process of
determining,  through responses and other appropriate action, where there is any
material  likelihood of  non-compliance  having a potentially  material  impact;
however, the potential impact and related costs are not known at this time.

Aon's Contingency Plans
Contingency  planning at Aon has two  distinct  components.  First,  where Aon's
planned  completion dates for IT system  replacement or remediation could extend
into the third quarter 1999,  contingency plans are required.  These contingency
issues are being developed on a business unit basis. Contingency plans have been
successfully  invoked  for a number of  business  units to date.  These  include
changing compliance  strategies from replacement to remediation (and vice versa)
and partial  remediation  to meet critical  dates prior to January 1, 2000.  The
latter will require completion of remediation in 1999. Second, preparations must
be made for IT software  and  hardware,  that have Year 2000 "bugs" and that are
not revealed until after December 31, 1999,  despite  testing.  Aon  anticipates
handling these situations with immediate program fixes,  swapped backup hardware
or process  work-around.  Aon does not  anticipate  that problems of this nature
will be significant due to thorough testing and the distributed  nature of Aon's
systems.

                                     -  17  -
<PAGE>

REVIEW BY INDEPENDENT AUDITORS
- - - - - - - - - - - - - - - - - ------------------------------

The condensed  consolidated  financial statements at March 31, 1999, and for the
first quarter then ended have been reviewed,  prior to filing,  by Ernst & Young
LLP, Aon's independent auditors, and their report is included herein.

                                    -  18  -
<PAGE>

INDEPENDENT ACCOUNTANTS' REVIEW REPORT



Board of Directors and Stockholders
Aon Corporation

We have reviewed the accompanying  condensed consolidated statement of financial
position of Aon  Corporation  as of March 31,  1999,  and the related  condensed
consolidated  statements  of income and cash flows for the  three-month  periods
ended March 31, 1999 and 1998. These financial statements are the responsibility
of the Company's management.

We  conducted  our  reviews in  accordance  with  standards  established  by the
American  Institute  of  Certified  Public  Accountants.  A  review  of  interim
financial  information consists principally of applying analytical procedures to
financial  data, and making  inquiries of persons  responsible for financial and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing  standards,  which will be performed
for the full year with the  objective of  expressing  an opinion  regarding  the
financial  statements taken as a whole.  Accordingly,  we do not express such an
opinion.

Based on our reviews, we are not aware of any material modifications that should
be made to the accompanying condensed consolidated financial statements referred
to  above  for  them to be in  conformity  with  generally  accepted  accounting
principles.

We have  previously  audited,  in accordance  with generally  accepted  auditing
standards,  the consolidated  statement of financial position of Aon Corporation
as of December  31, 1998,  and the related  consolidated  statements  of income,
stockholders'  equity,  and cash flows for the year then  ended,  not  presented
herein,  and in our report dated  February 9, 1999, we expressed an  unqualified
opinion  on  those  consolidated  financial  statements.  In  our  opinion,  the
information set forth in the accompanying  condensed  consolidated  statement of
financial  position as of December 31, 1998, is fairly  stated,  in all material
respects,  in relation to the consolidated  statement of financial position from
which it has been derived.



                                                    /s/ Ernst & Young LLP
                                                    ----------------------
                                                    ERNST & YOUNG LLP

Chicago, Illinois
May 4, 1999

                                     -  19  -
<PAGE>

                                     PART II
                                     -------

                                OTHER INFORMATION
                                -----------------


ITEM 4.          SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

      (a)   The Annual  Meeting of  Stockholders  of the  Registrant was held on
            April 16, 1999 (the "1999 Annual Meeting").

      (b)   Not applicable.

      (c)(i)The  tabulation  of votes below does not  reflect the  three-for-two
            stock split payable May 17, 1999 to stockholders of record on May 4,
            1999. Set forth below is the tabulation of the votes on each nominee
            for election as a director:


              Name                               For                  Against
              ----                               ---                  -------
              Daniel T. Carroll              150,875,122              609,908
              Franklin A. Cole               150,997,751              487,279
              Edgar D. Jannotta              150,918,268              566,762
              Lester B. Knight               151,003,882              481,148
              Perry J. Lewis                 151,047,926              437,104
              Andrew J. McKenna              150,920,208              564,822
              Newton N. Minow                149,346,671            2,138,359
              Richard C. Notebaert           150,989,501              495,529
              Michael D. O'Halleran          151,004,794              480,236
              Donald S. Perkins              150,892,466              592,564
              John W. Rogers,Jr.             151,043,790              441,240
              Patrick G. Ryan                151,009,126              475,904
              George A. Schaefer             151,037,982              477,048
              Raymond I. Skilling            151,036,222              448,808
              Fred L. Turner                 151,047,018              438,012
              Arnold R. Weber                150,914,718              570,312
              Carolyn Y. Woo                 151,036,634              448,396


            (ii)  Set forth below is the tabulation of the vote on the selection
                  of Ernst & Young LLP as auditors  for the  Registrant  for the
                  1999 fiscal year.

                     For                 Against              Abstain
                     ---                 -------              -------

                 151,006,021             131,891              347,118

            (d)   Not applicable.

                                     -  20  -
<PAGE>

ITEM 6.          EXHIBITS AND REPORTS ON FORM 8-K

      (a)   Exhibits - The  exhibits  filed  with this  report are listed on the
            --------
            attached Exhibit Index.

      (b)   Reports on Form 8-K - No Current  Reports on Form 8-K were filed for
            -------------------
            the quarter ended March 31, 1999.


SIGNATURE

Pursuant to the  requirements  of the  Securities  and Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                             Aon Corporation
                                             ---------------
                                             (Registrant)

May 14, 1999                                  /s/ Harvey N. Medvin
                                             ----------------------------------
                                             HARVEY N. MEDVIN
                                             EXECUTIVE VICE PRESIDENT AND
                                             CHIEF FINANCIAL OFFICER
                                             (Principal Financial and Accounting
                                             Officer)

                                     -  21  -
<PAGE>

Aon CORPORATION
- - - - - - - - - - - - - - - - - ---------------

EXHIBIT  INDEX  
- - - - - - - - - - - - - - - - - --------------


Exhibit Number
In Regulation S-K

ITEM 601 EXHIBIT TABLE
- - - - - - - - - - - - - - - - - ----------------------

(10) Material Contracts

       (a) First Amendment  to the  Aon Stock  Option  Plan as Amended  and
                  Restated Through 1997.

       (b) First Amendment  to the  Aon Stock  Award  Plan as  Amended  and
                  Restated Through 1997.

(12) Statements regarding Computation of Ratios

       (a)   Statement regarding  Computation of Ratio of Earnings to Fixed
                  Charges.

       (b)   Statement  regarding  Computation  of  Ratio  of  Earnings  to
                  Combined Fixed Charges and Preferred Stock Dividends.

(15) Letter re: Unaudited Interim Financial Information

(27) Financial Data Schedule

                                     -  22  -
<PAGE>


                                                                   Exhibit 10(a)

                                 FIRST AMENDMENT
                          TO THE AON STOCK OPTION PLAN
                      AS AMENDED AND RESTATED THROUGH 1997


      THIS FIRST AMENDMENT  ("First  Amendment") TO THE AON STOCK OPTION PLAN AS
AMENDED AND RESTATED  THROUGH  1997 (the "Plan") is hereby made  effective as of
the 19th day of March, 1999.

                                 R E C I T A L S


      WHEREAS,  the  Company  deems it in the best  interests  of the Company to
amend certain provisions of the Plan to clarify existing policies, practices and
procedures; and

      WHEREAS, the Company desires to make available to participants in the Plan
certain deferral features.

      NOW, THEREFORE, the Plan is hereby amended as follows:

1.    All references in the Plan to "paragraph"  when used in conjunction with a
      specific  paragraph  number,  e.g.,  "paragraph"  7,  shall be  changed to
      "Section."

2.    Section 2 of the Plan is hereby  amended by deleting  the second and third
      sentences and inserting the following:

            "Since the  adoption  of the Plan in 1982,  after  giving  effect to
            subsequent  additions approved by shareholders and stock splits, the
            aggregate  number  of shares  of  Common  Stock  which may be issued
            pursuant to options granted under the Plan shall be 23,250,000.  The
            administration of the Plan, agreements relating to Grants, including
            but not limited to agreements  governing unfair competition,  forms,
            practices,  procedures,  all questions involving the eligibility for
            Grants,  interpretations  of  the  provisions  of the  Plan,  or the
            operation of the Plan shall be decided by the Committee."

3.    Section 4 of the Plan is hereby amended by adding the following as a final
      sentence:

            "The  Committee  in its sole  discretion  may satisfy its  liability
            under  this  Section  4 by making a cash  payment  equal to the Fair
            Market Value of the shares of Common Stock to be delivered."





<PAGE>

4.    Section 6 is hereby amended by adding the following as a final sentence:

            "Any Participant who terminates  employment,  other than by death or
            disability,  will be permitted  to exercise any vested  shares for a
            period  of  30  days   immediately   following   the   Participant's
            termination  of  employment,  after which any vested  shares will be
            forfeited."

5.    Section 7 is hereby amended by deleting the following sentence:

            "Shares  subject  to  a  Grant  shall  not  be  delivered  to  the
            Participant until such time as such payment has been made."

6.    Section 15 is hereby  amended by adding  the  following  as new second and
      third paragraphs, and moving the current second paragraph to be the fourth
      paragraph:

            "To the extent any shares of Common Stock covered by a Grant are not
            delivered  to a  Participant  or  beneficiary  because the Grant was
            forfeited  or  canceled,  or the  shares  of  Common  Stock  are not
            delivered  because the Grant or exercise of the option is settled in
            cash or used to satisfy the applicable tax  withholding  obligation,
            such shares shall not be deemed to have been  delivered for purposes
            of  determining  the  maximum  number  of  shares  of  Common  Stock
            available for delivery under the Plan.

            If the  exercise  price of any Grant under this Plan is satisfied by
            tendering  shares  of Common  Stock to the  Corporation  (by  either
            actual  delivery  of by  attestation),  only the number of shares of
            Common Stock issued net of shares of Common Stock  tendered shall be
            deemed  delivered for purposes of determining  the maximum number of
            shares of Common Stock available for delivery under the Plan."

7.    There is added a new Section 16 as follows:

            "The  Committee  may, in its discretion and subject to such rules as
            it may adopt, permit a Participant to defer all or a portion of such
            shares otherwise deliverable pursuant to an exercise of a Grant."


<PAGE>

                                                                   Exhibit 10(b)

                                 FIRST AMENDMENT
                           TO THE AON STOCK AWARD PLAN
                      AS AMENDED AND RESTATED THROUGH 1997


      THIS FIRST  AMENDMENT  ("First  Amendment") TO THE AON STOCK AWARD PLAN AS
AMENDED AND RESTATED  THROUGH  1997 (the "Plan") is hereby made  effective as of
the 19th day of March, 1999.


                                 R E C I T A L S


      WHEREAS,  the  Company  deems it in the best  interests  of the Company to
amend certain provisions of the Plan to clarify existing policies, practices and
procedures.

      NOW, THEREFORE, the Plan is hereby amended as follows:

1.    All references in the Plan to "paragraph"  when used in conjunction with a
      specific  paragraph  number,  e.g.,  "paragraph"  7,  shall be  changed to
      "Section."

2.    Section 2 of the Plan is hereby amended by deleting the second,  third and
      fourth sentences and inserting the following:

            "Since the  adoption  of the Plan in 1987,  after  giving  effect to
            subsequent  additions approved by shareholders and stock splits, the
            aggregate  number  of shares  of  Common  Stock  which may be issued
            pursuant  to  Awards  under  the  Plan  shall  be  12,900,000.   The
            administration of the Plan, agreements relating to Awards, including
            but not limited to agreements  governing unfair competition,  forms,
            practices,  procedures,  all questions involving the eligibility for
            Awards,  interpretations  of  the  provisions  of the  Plan,  or the
            operation of the Plan shall be decided by the Committee."

3.    Section 4 of the Plan is hereby amended by deleting the fourth sentence of
      the second paragraph and substituting the following:

            "The  Participant does not have the right to vote any shares subject
            to an Award or receive  dividends  on such shares  prior to the time
            they are vested."

4.    Section 6 is hereby amended by deleting the second paragraph and inserting
      the following: 
            
            "The  Committee  may, in its discretion and subject to such rules as
            it may adopt,


<PAGE>
            permit or, in the absence of the receipt of payment therefore within
            prescribed time periods, require Participant to pay all or a portion
            of such  taxes  arising  in connection  with  vesting of an Award by
            electing  to have the  Corporation  withhold  shares of Common Stock
            otherwise  issuable  having  a Fair Market Value equal to all or any
            portion of such tax to be satisfied in this manner."

5.    Section 13 is hereby amended by adding the following:

            "To the extent any  shares of Common  Stock  covered by an Award are
            not delivered to a Participant or beneficiary  because the Award was
            forfeited  or  canceled,  or the  shares  of  Common  Stock  are not
            delivered  because the Award or exercise of the option is settled in
            cash or used to satisfy the applicable tax  withholding  obligation,
            such shares shall not be deemed to have been  delivered for purposes
            of  determining  the  maximum  number  of  shares  of  Common  Stock
            available for delivery under the Plan."

6.    The text of Section 15 is hereby deleted and the following inserted:

            "The  Committee  may, in its discretion and subject to such rules as
            it may adopt, permit a Participant to defer all or a portion of such
            shares otherwise deliverable pursuant to an exercise of a Award."

<PAGE>


<TABLE>
<CAPTION>
                                                                                        Exhibit 12(a)

                             Aon Corporation and Consolidated Subsidiaries
                               Combined With Unconsolidated Subsidiaries
                           Computation of Ratio of Earnings to Fixed Charges


                                            First Quarter Ended
                                                 March 31,              Years Ended December 31,
                                           ----------------- ------------------------------------------
 (millions except ratios)                    1999     1998    1998     1997    1996     1995     1994
                                           -------- -------- ------- -------- -------  ------- --------
<S>                                           <C>     <C>     <C>      <C>     <C>      <C>      <C>  
 Income from continuing operations
    before provision for income taxes (1)   $   96   $  238  $  931   $  542  $  446   $  458   $  397

 ADD BACK FIXED CHARGES:

    Interest on indebtedness                    21       20      87       70      45       56       46

    Interest on ESOP                             -        1       2        3       4        5        6

    Portion of rents representative of
      interest factor                           13       11      51       44      29       21       29

                                            -------  ------- -------  ------- -------  -------  -------
         INCOME AS ADJUSTED                 $  130   $  270  $ 1,071  $  659  $  524   $  540   $  478
                                            =======  ======= =======  ======= =======  =======  =======


 FIXED CHARGES:

    Interest on indebtedness                $   21   $   20  $   87   $   70  $   45   $   56   $   46

    Interest on ESOP                             -        1       2        3       4        5        6

    Portion of rents representative of
       interest factor                          13       11      51       44      29       21       29

                                            -------  ------- -------  ------- -------  -------  -------
         TOTAL FIXED CHARGES                $   34   $   32  $  140   $  117  $   78   $   82   $   81
                                            =======  ======= =======  ======= =======  =======  =======

 RATIO OF EARNINGS TO FIXED CHARGES            3.8      8.5     7.6      5.6     6.7      6.6      5.9
                                            =======  ======= =======  ======= =======  =======  =======

 RATIO OF EARNINGS TO FIXED CHARGES (2)        8.6                       7.1     7.9
                                            =======                   ======= =======

<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes special charges of $163 million for the first
      quarter  ended  March 31, 1999 and $172  million  and  $90 million for the
      years ended December 31, 1997 and 1996, respectively.

(2)   The  calculation  of this ratio of earnings to fixed charges  reflects the
      exclusion of special  charges from the income from  continuing  operations
      before  provision  for income taxes  component for the first quarter ended
      March  31,  1999 and for the  years  ended  December  31,  1997 and  1996,
      respectively.
</FN>
</TABLE>
<PAGE>



<TABLE>
<CAPTION>
                                                                                        Exhibit 12(b)

                             Aon Corporation and Consolidated Subsidiaries
                               Combined With Unconsolidated Subsidiaries
                      Computation of Ratio of Earnings to Combined Fixed Charges
                                     and Preferred Stock Dividends


                                            First Quarter Ended
                                                 March 31,              Years Ended December 31,
                                           ----------------- ------------------------------------------
 (millions except ratios)                    1999     1998    1998     1997    1996     1995     1994
                                           -------- -------- ------- -------- -------  ------- --------
<S>                                           <C>     <C>     <C>      <C>     <C>      <C>      <C>  
 Income from continuing operations
    before provision for income taxes (1)   $   96   $  238  $  931   $  542  $  446   $  458   $  397

 ADD BACK FIXED CHARGES:

    Interest on indebtedness                    21       20      87       70      45       56       46

    Interest on ESOP                             -        1       2        3       4        5        6

    Portion of rents representative of
      interest factor                           13       11      51       44      29       21       29

                                            -------  ------- -------  ------- -------  -------  -------
         INCOME AS ADJUSTED                 $  130   $  270  $ 1,071  $  659  $  524   $  540   $  478
                                            =======  ======= =======  ======= =======  =======  =======


FIXED CHARGES AND PREFERRED STOCK DIVIDENDS:

    Interest on indebtedness                $   21   $   20  $   87   $   70  $   45   $   56   $   46

    Preferred stock dividends                   17       17      70       82      29       38       48

                                            -------  ------- -------  ------- -------  -------  -------
         Interest and dividends                 38       37     157      152      74       94       94

    Interest on ESOP                             -        1       2        3       4        5        6

    Portion of rents representative of
       interest factor                          13       11      51       44      29       21       29

         
         TOTAL FIXED CHARGES AND PREFERRED -------  ------- -------  ------- -------  -------  -------
             STOCK DIVIDENDS                $   51   $   49  $  210   $  199  $  107   $  120   $  129
                                            =======  ======= =======  ======= =======  =======  =======

 RATIO OF EARNINGS TO COMBINED FIXED
   CHARGES AND PREFERRED STOCK DIVIDENDS (2)   2.5      5.5     5.1      3.3     4.9      4.5      3.7
                                            =======  ======= =======  ======= =======  =======  =======

 RATIO OF EARNINGS TO COMBINED FIXED
   CHARGES AND PREFERRED STOCK DIVIDENDS (3)   5.7                       4.2     5.8
                                            =======                   ======= =======
<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes special charges of $163 million for the first
      quarter  ended  March 31, 1999 and $172  million  and  $90 million for the
      years ended December 31, 1997 and 1996, respectively.

(2)   Included in total fixed  charges and  preferred  stock  dividends  are $16
      million  for  the first  quarters ended  March  31, 1999 and 1998, and $66
      million and $64 million  for the years ended  December 31, 1998  and 1997,
      respectively, of pretax distributions on the 8.205% mandatorily redeemable
      preferred capital  securities which are classified as "minority  interest"
      on the condensed consolidated statements of operations.

(3)   The  calculation  of this ratio of earnings to fixed charges  reflects the
      exclusion of special  charges from the income from  continuing  operations
      before  provision  for income taxes  component for the first quarter ended
      March  31,  1999 and for the  years  ended  December  31,  1997 and  1996,
      respectively.
</FN>
</TABLE>
<PAGE>

                                                                      Exhibit 15




Board of Directors and Stockholders
Aon Corporation


We are aware of the incorporation by reference in the Registration Statements of
Aon Corporation ("Aon") described in the following table of our report dated May
4, 1999  relating to the  unaudited  condensed  consolidated  interim  financial
statements of Aon Corporation that are included in its Form 10-Q for the quarter
ended March 31, 1999:

    Registration Statement
      Form      Number                    Purpose
      ----      ------                    -------
      
      S-8      33-27984    Pertaining to Aon's savings plan
      S-8      33-42575    Pertaining  to Aon's  stock  award  plan and  stock
                              option plan
      S-8      33-59037    Pertaining  to Aon's  stock  award  plan and  stock
                              option plan
      S-8      333-55773   Pertaining to Aon's stock award plan,  stock option
                              plan and employee stock purchase plan
      S-4      333-21237   Offer  to  exchange   Capital   Securities  of  Aon
                              Capital A
      S-3      333-50607   Pertaining to the  registration  of 369,000  shares
                              of common stock

Pursuant to Rule 436(c) of the  Securities Act of 1933, our report is not a part
of the registration  statements  prepared or certified by accountants within the
meaning of Section 7 or 11 of the Securities Act of 1933.


                                                /s/ Ernst & Young LLP
                                                ---------------------
                                                ERNST & YOUNG LLP



Chicago, Illinois
May 4, 1999

<PAGE>

<TABLE> <S> <C>
                         
<ARTICLE>                                        5
<LEGEND>                  
     This schedule contains  summary financial information  extracted from
     Condensed Consolidated Statements of Financial Position and Condensed
     Consolidated Statements of Income and is qualified in its entirety by
     reference to such financial statements.
</LEGEND>                 
<MULTIPLIER>                  1,000,000
<CURRENCY>                     USD
                               
<S>                            <C>
<PERIOD-TYPE>                        3-MOS
<FISCAL-YEAR-END>              DEC-31-1999
<PERIOD-START>                 JAN-01-1999
<PERIOD-END>                   MAR-31-1999
<EXCHANGE-RATE>                        1.0
<CASH>                               3,408 <F1>
<SECURITIES>                         3,498 <F2>
<RECEIVABLES>                        7,196
<ALLOWANCES>                            83
<INVENTORY>                              0
<CURRENT-ASSETS>                         0 <F3>
<PP&E>                               1,438
<DEPRECIATION>                         763
<TOTAL-ASSETS>                      20,484
<CURRENT-LIABILITIES>                    0 <F3>
<BONDS>                                576 <F4>
                  850 <F5>
                              0
<COMMON>                               258 <F6>
<OTHER-SE>                           2,629
<TOTAL-LIABILITY-AND-EQUITY>        20,484
<SALES>                                  0
<TOTAL-REVENUES>                     1,699
<CGS>                                    0
<TOTAL-COSTS>                            0
<OTHER-EXPENSES>                     1,603 <F7>
<LOSS-PROVISION>                         0
<INTEREST-EXPENSE>                      21
<INCOME-PRETAX>                         96
<INCOME-TAX>                            36
<INCOME-CONTINUING>                     60
<DISCONTINUED>                           0
<EXTRAORDINARY>                          0
<CHANGES>                                0
<NET-INCOME>                            50
<EPS-PRIMARY>                         0.19 <F6>
<EPS-DILUTED>                         0.19 <F6>
<FN>
<F1>  Includes short-term investments.
<F2>  Includes fixed maturities and equity securities at fair value.
<F3>  Not applicable based on current reporting format.
<F4>  Represents notes payable.
<F5>  Redeemable  preferred  stock.   Includes   Company-obligated   Mandatorily
      Redeemable Preferred Capital Securities of Subsidiary Trust Holding Solely
      the Company's Junior Subordinated Debentures.
<F6>  Adjusted to reflect three-for-two stock split effective May 4, 1999.
<F7>  Represents total expenses.
</FN>
        

</TABLE>


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