AON CORP
11-K, 1999-06-29
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 11-K





__X__ Annual Report Pursuant to Section 15(d) of the Securities
            Exchange Act of 1934

            For the fiscal year ended December 31, 1998

                                       OR

_____       Transition Report Pursuant to Section 15(d) of the
            Securities Exchange Act of 1934



            A.    Full  title  of the  plan  and the  address  of the  plan,  if
                  different from the issuer named below:

                                Aon Savings Plan


            B.    Name of the issuer of the securities held pursuant to the plan
                  and the address of its principal executive office:


                                 Aon Corporation
                               123 N. Wacker Drive
                             Chicago, Illinois 60606

<PAGE>
                               S I G N A T U R E S

Pursuant to the  requirements of the Securities  Exchange Act of 1934, the Plan,
by the Plan  Administrator,  the Committee,  has caused this annual report to be
signed on its  behalf by the  undersigned,  thereunto  duly  authorized,  in the
County of Cook and the State of Illinois on the 25th day of June, 1999.

AON SAVINGS PLAN

BY THE COMMITTEE



/s/ THOMAS STACHURA                     /s/ JOHN A. RESCHKE
- - - - - - - - - - - - - - - - - ----------------------------            -------------------------
Thomas Stachura                              John A. Reschke




/s/ NANCY GROSS                         /s/ ROBERT S. Hurwitz
- - - - - - - - - - - - - - - - - ----------------------------            -------------------------
Nancy Gross                                  Robert S. Hurwitz




/s/ ELIZABETH WHITTLE
- - - - - - - - - - - - - - - - - ----------------------------
Elizabeth Whittle


                                     - 2 -
<PAGE>

                 FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULES

                                AON SAVINGS PLAN

                     Years Ended December 31, 1998 and 1997

                       With Report of Independent Auditors

                    Employer Identification Number 36-3051915

                                   Plan # 020

<PAGE>
                                AON SAVINGS PLAN

                 FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULES

                     Years ended December 31, 1998 and 1997


                                    CONTENTS




Report of Independent Auditors                                               1

Financial Statements:

      Statement of Net Assets Available for Benefits,
      with Fund Information at December 31, 1998                             2

      Statement of Net Assets Available for Benefits,
      with Fund Information at December 31, 1997                             3

      Statement of Changes in Net Assets Available for Benefits,
      with Fund Information for the year ended December 31, 1998             4

      Statement of Changes in Net Assets Available for Benefits,
      with Fund Information for the year ended December 31, 1997             5

Notes to Financial Statements                                                6

Supplemental Schedules:

      Line 27a - Schedule of Assets Held for Investment Purposes           17

      Line 27d - Schedule of Reportable Transactions                       21


<PAGE>
                         Report of Independent Auditors

The Participants and Administrative Committee
Aon Savings Plan

We have audited the accompanying statements of net assets available for benefits
of Aon Savings Plan as of December 31, 1998 and 1997, and the related statements
of changes in net assets available for benefits for the years then ended.  These
financial  statements  are the  responsibility  of the  Plan's  management.  Our
responsibility  is to express an opinion on these financial  statements based on
our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all  material  respects,  the net assets  available  for benefits of the Plan at
December  31,  1998 and 1997,  and the changes in its net assets  available  for
benefits  for the years  then  ended,  in  conformity  with  generally  accepted
accounting principles.

Our audits  were  performed  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The accompanying  supplemental  schedules
of assets held for  investment  purposes as of December 31, 1998, and reportable
transactions  for the year then ended,  are presented for purposes of additional
analysis  and  are not a  required  part of the  financial  statements,  but are
supplementary  information  required  by the  Department  of  Labor's  Rules and
Regulations for Reporting and Disclosure  under the Employee  Retirement  Income
Security Act of 1974. These supplemental schedules are the responsibility of the
Plan's  management.  The  Fund  Information  in the  statements  of  net  assets
available for benefits and the statements of changes in net assets available for
benefits is presented for purposes of additional analysis rather than to present
the net assets  available  for benefits and changes in net assets  available for
benefits of each fund. The supplemental schedules and Fund Information have been
subjected  to the  auditing  procedures  applied  in  our  audits  of the  basic
financial  statements  and, in our  opinion,  are fairly  stated in all material
respects in relation to the basic financial statements taken as a whole.


                                                               ERNST & YOUNG LLP


June 11, 1999

                                     - 1 -
<PAGE>
<TABLE>
<CAPTION>
                                            Employer Identification # 36-3051915
                                                                      Plan # 020

                                AON SAVINGS PLAN
      Statement of Net Assets Available for Benefits, with Fund Information
                                December 31, 1998
                                 (in thousands)

                                                                                 Fund Information

                                                      Money         Aon        Investment   Government     Total       Common
                                                     Market        Stock       Contracts    Securities    Return      Stock Index
Assets:                                               Fund         Fund          Fund         Fund         Fund         Fund
- - - - - - - - - - - - - - - - - -------                                            -----------  -----------   ----------   ----------   -----------  -----------
<S>                                               <C>          <C>           <C>          <C>          <C>          <C>
Investments, at Fair Value:
     United States Government and
        Government Agency Securities                                         $   92,425
     Common Stocks:
       Aon Corporation                                         $   368,496            -
     Investments held in the Aon Funds:
        Aon Money Market Fund                     $   133,933            -            -
        Aon Government Securities Fund                      -            -            -  $    49,186
        Aon Asset Allocation Fund                           -            -            -            -   $   164,318
        Aon S&P 500 Index Fund                              -            -            -            -             -  $   251,594
        Aon REIT Index Fund                                 -            -            -            -             -            -
        Aon International Equity Fund                       -            -            -            -             -            -
     Other Long-Term Investments                            -            -            5            -             -            -
     Short-Term Investments                                57        4,228       13,479          335         3,865          423
     Participant Loans                                      -            -            -            -             -            -
                                                   -----------  -----------   ----------   ----------   -----------  -----------

                                                      133,990      372,724      105,909       49,521       168,183      252,017

     Unallocated Guaranteed Insurance Contracts,
         at Contract Value                                  -            -       11,455            -             -            -
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Investments                      133,990      372,724      117,364       49,521       168,183      252,017

Receivables:
     Company Contribution                               1,513        6,302        1,350        1,064         3,488        6,058
     Participant Contribution                             477          440           62           55           210          478
     Accrued Dividends and Income                         201          590          519           75           248          355
     Due from Broker                                       68            -            -            -             -            -
     Fund Transfers                                    (2,155)      (2,261)         153          157         5,088       (1,223)
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Receivables                          104        5,071        2,084        1,351         9,034        5,668
                                                   -----------  -----------   ----------   ----------   -----------  -----------

        Total Assets                                  134,094      377,795      119,448       50,872       177,217      257,685

Liabilities:
     Accrued Administrative Expenses Payable               47          143           42           16            53           71
     Accrued Interest Expense                               -            -            -            -             -            -
     Notes Payable                                          -            -            -            -             -            -
     Due to Broker                                         34          166            -            -             -            -

                                                   -----------  -----------   ----------   ----------   -----------  -----------
        Total Liabilities                                  81          309           42           16            53           71
                                                   -----------  -----------   ----------   ----------   -----------  -----------

Net Assets Available for Benefits
     Allocated Net Assets                             134,013      377,486      119,406       50,856       177,164      257,614
     Unallocated Net Assets                                 -            -            -            -             -            -

                                                   -----------  -----------   ----------   ----------   -----------  -----------
Total Net Assets Available for Benefits           $   134,013  $   377,486   $  119,406   $   50,856   $   177,164  $   257,614
                                                   ===========  ===========   ==========   ==========   ===========  ===========
</TABLE>

     The accompanying notes are an integral part of these financial statements.


<TABLE>
<CAPTION>
                                            Employer Identification # 36-3051915
                                                                      Plan # 020

                                AON SAVINGS PLAN
      Statement of Net Assets Available for Benefits, with Fund Information
                                December 31, 1998
                                 (in thousands)
                                  (Continued)

                                                                                 Fund Information
                                                    Real Estate    International              ESOP         ESOP
                                                    Securities    Equity       Participant  Allocated    Unallocated
Assets:                                               Fund         Fund         Loans       Account       Account       Total
- - - - - - - - - - - - - - - - - -------                                            -----------  -----------   ----------   ----------   -----------  -----------
<S>                                               <C>          <C>           <C>          <C>          <C>          <C>
Investments, at Fair Value:
     United States Government and
        Government Agency Securities                                                                                $    92,425
     Common Stocks:
       Aon Corporation                                                                   $   219,601                    588,097
     Investments held in the Aon Funds:
        Aon Money Market Fund                                                                      -                    133,933
        Aon Government Securities Fund                                                             -                     49,186
        Aon Asset Allocation Fund                                                                  -                    164,318
        Aon S&P 500 Index Fund                                                                     -                    251,594
        Aon REIT Index Fund                       $    19,603                                      -                     19,603
        Aon International Equity Fund                       -  $    27,014                         -                     27,014
     Other Long-Term Investments                            -            -                         -                          5
     Short-Term Investments                             1,112          206                     2,324   $       677       26,706
     Participant Loans                                      -            -   $   13,161            -             -       13,161
                                                   -----------  -----------   ----------   ----------   -----------  -----------

                                                       20,715       27,220       13,161      221,925           677    1,366,042

     Unallocated Guaranteed Insurance Contracts,
         at Contract Value                                  -            -            -            -             -       11,455
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Investments                       20,715       27,220       13,161      221,925           677    1,377,497

Receivables:
     Company Contribution                                 813          888            -            -        15,625       37,101
     Participant Contribution                              51          117            -            -             -        1,890
     Accrued Dividends and Income                          34           39            -           12             3        2,076
     Due from Broker                                        -            -            -            -             -           68
     Fund Transfers                                       925         (684)           -       (1,825)        1,825            -
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Receivables                        1,823          360            -       (1,813)       17,453       41,135
                                                   -----------  -----------   ----------   ----------   -----------  -----------

        Total Assets                                   22,538       27,580       13,161      220,112        18,130    1,418,632

Liabilities:
     Accrued Administrative Expenses Payable                8            9            -          115             2          506
     Accrued Interest Expense                               -            -            -            -            61           61
     Notes Payable                                          -            -            -            -        17,500       17,500
     Due to Broker                                          -            -            -            -             -          200

                                                   -----------  -----------   ----------   ----------   -----------  -----------
        Total Liabilities                                   8            9            -          115        17,563       18,267
                                                   -----------  -----------   ----------   ----------   -----------  -----------

Net Assets Available for Benefits
     Allocated Net Assets                              22,530       27,571       13,161      219,997             -    1,399,798
     Unallocated Net Assets                                 -            -            -            -           567          567

                                                   -----------  -----------   ----------   ----------   -----------  -----------
Total Net Assets Available for Benefits           $    22,530  $    27,571   $   13,161   $  219,997   $       567  $ 1,400,365
                                                   ===========  ===========   ==========   ==========   ===========  ===========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                     - 2 -
<PAGE>
<TABLE>
<CAPTION>
                                                       Employer Iden36-3051915 #
                                                                      Plan # 020


                                AON SAVINGS PLAN
      Statement of Net Assets Available for Benefits, with Fund Information
                                December 31, 1997
                                 (in thousands)

                                                                                 Fund Information

                                                      Money                      Aon        Investment   Government     Total
                                                     Market      Balanced       Stock       Contracts    Securities    Return
Assets:                                               Fund         Fund          Fund         Fund         Fund         Fund
- - - - - - - - - - - - - - - - - -------                                           -----------  -----------   ----------   ----------   -----------  -----------
<S>                                               <C>          <C>           <C>          <C>          <C>          <C>

Investments, at Fair Value:
     United States Government and
        Government Agency Securities                                                      $   54,658
     Common Stocks:
       Aon Corporation                                                       $  392,871            -
       Other                                                   $        12            -            -
     Investments held in the Aon Funds:
        Aon Money Market Fund                     $    29,678            -            -            -
        Aon Government Securities Fund                      -            -            -            -   $    16,768
        Aon Asset Allocation Fund                           -            -            -            -             -  $    79,836
        Aon S&P 500 Index Fund                              -            -            -            -             -            -
        Aon REIT Index Fund                                 -            -            -            -             -            -
        Aon International Equity Fund                       -            -            -            -             -            -
     Other Long-Term Investments                            -            -            -           14             -            -
     Short-Term Investments                                95       64,366          421        4,914            76          140
     Participant Loans                                      -            -            -            -             -            -
                                                   -----------  -----------   ----------   ----------   -----------  -----------

                                                       29,773       64,378      393,292       59,586        16,844       79,976

     Unallocated Guaranteed Insurance Contracts,
         at Contract Value                                  -            -            -       43,526             -            -
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Investments                       29,773       64,378      393,292      103,112        16,844       79,976

Receivables:
     Company Contribution                                 794            -        5,327        1,581           756        1,701
     Participant Contribution                              28           (2)         162           45            20           57
     Accrued Dividends and Income                           1          213            3           38             1            2
     Due from Broker                                        -        1,265          925       14,113             -            -
     Fund Transfers                                      (717)         286          418            3            18          152
                                                   -----------  -----------   ----------   ----------   -----------  -----------

               Total Receivables                          106        1,762        6,835       15,780           795        1,912
                                                   -----------  -----------   ----------   ----------   -----------  -----------

        Total Assets                                   29,879       66,140      400,127      118,892        17,639       81,888


                                                   -----------  -----------   ----------   ----------   -----------  -----------
Net Assets Available for Benefits                 $    29,879  $    66,140   $  400,127   $  118,892   $    17,639  $    81,888
                                                   ===========  ===========   ==========   ==========   ===========  ===========
</TABLE>
The accompanying notes are an integral part of these financial statements.

<TABLE>
<CAPTION>
                                                       Employer Iden36-3051915 #
                                                                      Plan # 020


                                AON SAVINGS PLAN
      Statement of Net Assets Available for Benefits, with Fund Information
                                December 31, 1997
                                 (in thousands)
                                   (Continued)

                                                                                 Fund Information

                                                      Common    Real Estate International
                                                   Stock Index   Securities    Equity      Participant
Assets:                                                Fund         Fund         Fund         Loans        Total
- - - - - - - - - - - - - - - - - -------                                            -----------  -----------   ----------   ----------   -----------
<S>                                               <C>          <C>           <C>          <C>          <C>

Investments, at Fair Value:
     United States Government and
        Government Agency Securities                                                                   $    54,658
     Common Stocks:
       Aon Corporation                                                                                     392,871
       Other                                                                                                    12
     Investments held in the Aon Funds:
        Aon Money Market Fund                                                                               29,678
        Aon Government Securities Fund                                                                      16,768
        Aon Asset Allocation Fund                                                                           79,836
        Aon S&P 500 Index Fund                    $   114,739                                              114,739
        Aon REIT Index Fund                                 -  $    17,923                                  17,923
        Aon International Equity Fund                       -            -  $    17,234                     17,234
     Other Long-Term Investments                            -            -            -                         14
     Short-Term Investments                               573           51          143                     70,779
     Participant Loans                                      -            -            -   $      581           581
                                                   -----------  -----------   ----------   ----------   -----------

                                                      115,312       17,974       17,377          581       795,093

     Unallocated Guaranteed Insurance Contracts,
         at Contract Value                                  -            -            -            -        43,526
                                                   -----------  -----------   ----------   ----------   -----------

               Total Investments                      115,312       17,974       17,377          581       838,619

Receivables:
     Company Contribution                               3,439          507          649            -        14,754
     Participant Contribution                             121           21           27            -           479
     Accrued Dividends and Income                           2            -            -            -           260
     Due from Broker                                        -            -            -            -        16,303
     Fund Transfers                                      (414)         103          151            -            -
                                                   -----------  -----------   ----------   ----------   -----------

               Total Receivables                        3,148          631          827            -        31,796
                                                   -----------  -----------   ----------   ----------   -----------

        Total Assets                                  118,460       18,605       18,204          581       870,415


                                                   -----------  -----------   ----------   ----------   -----------
Net Assets Available for Benefits                 $   118,460  $    18,605   $   18,204   $      581   $   870,415
                                                   ===========  ===========   ==========   ==========   ===========
</TABLE>


The accompanying notes are an integral part of these financial statements.

                                     - 3 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                             Employer Identification # 36-3051915
                                                                                                                       Plan # 020

                                                                                AON SAVINGS PLAN
                                                 Statement of Changes in Net Assets Available for Benefits, with Fund Information
                                                                      Year Ended December 31, 1998
                                                                                (in thousands)


                                                                               Fund Information

                                                  Money                    Aon       Investment   Government  Total
                                                  Market     Balanced     Stock      Contracts   Securities   Return
                                                   Fund        Fund        Fund        Fund        Fund        Fund
                                                 ---------   ---------   ---------   ---------   ---------   ---------
<S>                                            <C>         <C>         <C>         <C>         <C>         <C>
Net Investment Income
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts            $      146              $      101  $    6,417  $       16  $      105
   Net Realized and Unrealized Appreciation
    (Depreciation) in Fair Value of Investments        (2)                (20,997)        927       1,971       3,453
   Aon Corporation Dividends                            -                   7,479           -           -           -
   Other Dividends                                  8,134                       -           -       2,303       4,685
   Interest Expense                                     -                       -           -           -           -
   Management and Administrative fees                (135)                   (517)       (176)        (38)       (135)
                                                 ---------   ---------   ---------   ---------   ---------   ---------

Total Net Investment Income                         8,143                 (13,934)      7,168       4,252       8,108

Contributions
   Company                                          1,513                   6,302       1,350       1,064       3,487
   Participants                                     3,945                  16,251       3,221       2,806      10,028
                                                 ---------   ---------   ---------   ---------   ---------   ---------

Total Contributions                                 5,458                  22,553       4,571       3,870      13,515

Allocations

   Leveraged ESOP Allocation                            -                       -           -           -           -
   ESOP Diversification                                12                      57           9          15         103
                                                 ---------   ---------   ---------   ---------   ---------   ---------

Total Allocations                                      12                      57           9          15         103

Other Changes

Benefit Payments                                  (24,317)                (27,999)    (14,084)     (4,080)    (13,752)
Loan Activity                                        (746)                 (3,944)       (872)       (247)       (424)
Plan Mergers                                      134,646                      67           7          17      61,012
Interfund transfers                               (19,062) $  (66,140)        559       3,715      29,390      26,714
                                                 ---------   ---------   ---------   ---------   ---------   ---------

Total Other Changes                                90,521     (66,140)    (31,317)    (11,234)     25,080      73,550
                                                 ---------   ---------   ---------   ---------   ---------   ---------

Net Increase (Decrease) in Net Assets
    Available for Benefits                        104,134     (66,140)    (22,641)        514      33,217      95,276

Net Assets Available for
     Benefits at Beginning of Year                 29,879      66,140     400,127     118,892      17,639      81,888

                                                 ---------   ---------   ---------   ---------   ---------   ---------
Net Assets Available for Benefits
     at End of Year                            $ 134,013   $        -  $  377,486  $  119,406  $   50,856  $  177,164
                                                 =========   =========   =========   =========   =========   =========
</TABLE>
The accompanying notes are an integral part of these financial statements


<TABLE>
<CAPTION>
                                                                                             Employer Identification # 36-3051915
                                                                                                                       Plan # 020

                                                                                AON SAVINGS PLAN
                                                 Statement of Changes in Net Assets Available for Benefits, with Fund Information
                                                                      Year Ended December 31, 1998
                                                                                (in thousands)
                                                                                  (Continued)


                                                                               Fund Information

                                                  Common     Real Estate  International            ESOP        ESOP
                                                 Stock Index Securities   Equity     Participant Allocated   Unallocated
                                                   Fund        Fund        Fund       Loans      Account     Account      Total
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------
<S>                                            <C>         <C>         <C>         <C>         <C>         <C>         <C>
Net Investment Income
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts            $       84  $       10  $       12  $           $      138  $      423  $    7,452
   Net Realized and Unrealized Appreciation
    (Depreciation) in Fair Value of Investments    51,162      (5,855)      3,035                  21,204     (30,333)     24,565
   Aon Corporation Dividends                            -           -           -                   3,767         807      12,053
   Other Dividends                                  3,378       1,136         224                       -           -      19,860
   Interest Expense                                     -           -           -                       -      (2,384)     (2,384)
   Management and Administrative fees                (186)        (28)        (29)                   (371)        (17)     (1,632)
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------

Total Net Investment Income                        54,438      (4,737)      3,242                  24,738     (31,504)     59,914

Contributions
   Company                                          6,058         813         888                       -      15,625      37,100
   Participants                                    17,032       2,587       2,519                       -           -      58,389
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------

Total Contributions                                23,090       3,400       3,407                       -      15,625      95,489

Allocations

   Leveraged ESOP Allocation                            -           -           -                   8,558      (8,558)          -
   ESOP Diversification                                22          14           3                    (235)          -           -
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------

Total Allocations                                      22          14           3                   8,323      (8,558)          -

Other Changes

Benefit Payments                                  (19,433)     (1,248)     (1,825)                (15,714)          -    (122,452)
Loan Activity                                      (1,112)        (92)       (109) $    7,546           -           -           -
Plan Mergers                                       68,460          41          61       5,034     202,650      25,004     496,999
Interfund transfers                                13,689       6,547       4,588           -           -           -           -
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------

Total Other Changes                                61,604       5,248       2,715      12,580     186,936      25,004     374,547
                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------

Net Increase (Decrease) in Net Assets
    Available for Benefits                        139,154       3,925       9,367      12,580     219,997         567     529,950

Net Assets Available for
     Benefits at Beginning of Year                118,460      18,605      18,204         581           -           -     870,415

                                                 ---------   ---------   ---------   ---------   ---------   ---------   ---------
Net Assets Available for Benefits
     at End of Year                            $  257,614  $   22,530  $   27,571  $   13,161  $  219,997  $      567  $ 1,400,365
                                                 =========   =========   =========   =========   =========   =========   =========
</TABLE>
The accompanying notes are an integral part of these financial statements

                                     - 4 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                    Employer Identification # 36-3051915
                                                                                                              Plan # 020

                                                                AON SAVINGS PLAN
                             Statement of Changes in Net Assets Available for Benefits, with Fund Information
                                                           Year Ended December 31, 1997
                                                                 (in thousands)

                                                                            Fund Information

                                                     Money                    Aon      Investment   Government   Total
                                                    Market     Balanced      Stock     Contracts   Securities   Return
                                                     Fund        Fund        Fund        Fund        Fund        Fund
                                                   ----------  ----------  ----------  ----------  ----------  ----------
<S>                                               <C>         <C>         <C>         <C>         <C>         <C>
Net Investment Income
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts               $       12  $    2,349  $       55  $    7,533  $        8  $       15
   Net Realized and Unrealized
     Appreciation in Fair Value of Investments             -      11,026     118,016          85         559      15,437
   Aon Corporation Dividends                               -           -       7,057           -           -           -
   Other Dividends                                     1,600       1,007           -           -         833       1,281
   Management and Administrative fees                    (42)       (135)       (419)       (204)        (25)        (78)
                                                   ----------  ----------  ----------  ----------  ----------  ----------

Total Net Investment Income                            1,570      14,247     124,709       7,414       1,375      16,655

Contributions
   Company                                               794           -       5,327       1,581         756       1,701
   Participants                                        2,585           -      13,063       3,609       1,932       4,592
   ESOP Diversification                                    5           -          76         124          13          29
                                                   ----------  ----------  ----------  ----------  ----------  ----------

Total Contributions                                    3,384           -      18,466       5,314       2,701       6,322


Other Changes

Benefit Payments                                      (9,129)    (13,778)    (32,525)    (16,597)     (2,131)     (6,023)
Loan Activity                                              -           -           -           -           -           -
Interfund transfers                                    7,785     (29,983)    (10,771)     (7,479)      1,919      10,524
                                                   ----------  ----------  ----------  ----------  ----------  ----------

Total Other Changes                                   (1,344)    (43,761)    (43,296)    (24,076)       (212)      4,501
                                                   ----------  ----------  ----------  ----------  ----------  ----------

Net Increase (Decrease) in Net Assets
    Available for Benefits                             3,610     (29,514)     99,879     (11,348)      3,864      27,478

Net Assets Available for Benefits
     at Beginning of Year                             26,269      95,654     300,248     130,240      13,775      54,410

                                                   ----------  ----------  ----------  ----------  ----------  ----------
Net Assets Available for Benefits
     at End of Year                               $   29,879  $   66,140  $  400,127  $  118,892  $   17,639  $   81,888
                                                   ==========  ==========  ==========  ==========  ==========  ==========
</TABLE>

The accompanying notes are an integral part of these financial statements.

<TABLE>
<CAPTION>
                                                                                    Employer Identification # 36-3051915
                                                                                                              Plan # 020

                                                                AON SAVINGS PLAN
                             Statement of Changes in Net Assets Available for Benefits, with Fund Information
                                                           Year Ended December 31, 1997
                                                                 (in thousands)
                                                                   (Continued)

                                                                     Fund Information

                                                    Common     Real Estate  International
                                                   Stock Index Securities   Equity     Participant
                                                     Fund        Fund        Fund        Loans       Total
                                                   ----------  ----------  ----------  ----------  ----------
<S>                                               <C>         <C>         <C>         <C>         <C>
Net Investment Income
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts               $       28  $        6  $        7  $           $   10,013
   Net Realized and Unrealized
     Appreciation in Fair Value of Investments        23,751       1,935         143                 170,952
   Aon Corporation Dividends                               -           -           -                   7,057
   Other Dividends                                     1,730         572         651                   7,674
   Management and Administrative fees                   (111)        (21)        (25)                 (1,060)
                                                   ----------  ----------  ----------  ----------  ----------

Total Net Investment Income                           25,398       2,492         776                 194,636

Contributions
   Company                                             3,439         507         649                  14,754
   Participants                                        9,119       1,841       2,021                  38,762
   ESOP Diversification                                   31           3           5                     286
                                                   ----------  ----------  ----------  ----------  ----------

Total Contributions                                   12,589       2,351       2,675                  53,802


Other Changes

Benefit Payments                                      (8,346)     (1,590)     (1,863)                (91,982)
Loan Activity                                              -           -           -  $      375         375
Interfund transfers                                   14,437       9,519       4,049           -           -
                                                   ----------  ----------  ----------  ----------  ----------

Total Other Changes                                    6,091       7,929       2,186         375     (91,607)
                                                   ----------  ----------  ----------  ----------  ----------

Net Increase (Decrease) in Net Assets
    Available for Benefits                            44,078      12,772       5,637         375     156,831

Net Assets Available for Benefits
     at Beginning of Year                             74,382       5,833      12,567         206     713,584

                                                   ----------  ----------  ----------  ----------  ----------
Net Assets Available for Benefits
     at End of Year                               $  118,460  $   18,605  $   18,204  $      581  $  870,415
                                                   ==========  ==========  ==========  ==========  ==========
</TABLE>

The accompanying notes are an integral part of these financial statements.


                                     - 5 -
<PAGE>
                                AON SAVINGS PLAN

                          NOTES TO FINANCIAL STATEMENTS

                        Years Ended December 31, 1998 and 1997

1.    DESCRIPTION OF PLAN

A.    GENERAL

      The Aon Savings Plan (the Plan) was  authorized  by the Board of Directors
      of Aon Corporation  (the Company or Plan Sponsor).  The Plan is subject to
      the  provisions  of the Employee  Retirement  Income  Security Act of 1974
      (ERISA).

      Effective  January 15, 1997,  Aon  Corporation  acquired  Alexander  and
      Alexander  Services,  Inc.,  the plan  sponsor  of the  Thrift  Plan for
      Employees of Alexander and Alexander  Services,  Inc. and  Subsidiaries.
      On January 1, 1998,  the Thrift  Plan for  Employees  of  Alexander  and
      Alexander Services, Inc. and Subsidiaries was merged into the Plan.

      Also on January 1, 1998, the Aon Employees Stock Ownership Plan (ESOP) was
      merged  into  the  Plan.   The  ESOP  was  a   non-contributory,   defined
      contribution  plan  covering  all  employees  of the  Company  except  for
      employees covered by a collective  bargaining  agreement.  Features of the
      ESOP carried over to the Plan.

      Certain  Plan assets are held by the Aon Funds,  an  affiliated,  open-end
      management  investment company. The assets of the ESOP portion of the Plan
      are  invested  primarily  in common  stock of the  Company.  Additionally,
      certain  assets are invested by the Trustees as deemed  advisable in order
      for the Plan to meet its cash flow needs.  The  acquisition of the Company
      common  stock for the ESOP was  financed by loans  obtained  from  various
      lenders.

      The following  description of the Plan provides only general  information.
      Participants of the Plan should refer to the Summary Plan  Description for
      a more complete description of the Plan.

                                     - 6 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

B.    ELIGIBILITY AND PARTICIPATION

      Participation  is  limited to  employees  who have  completed  one year of
      service,  attained  the age of 21 and  worked  1,000  or more  hours  in a
      caledar year or employees  who were  eligible  under another plan that was
      merged into the Aon  Savings  Plan.  An  employee  must be employed in the
      United States on a permanent basis in order to participate.

C.    CONTRIBUTIONS

      PARTICIPANT  -  Participant  contributions  are made by  means of  regular
      payroll deductions. Non-highly compensated Participants, as defined by the
      IRC,  may  elect  to  make  contributions  between  1% and  16%  of  their
      compensation,  as defined by the Plan. Highly compensated Participants, as
      defined by the IRC, may elect to make  contributions  between 1% and 8% of
      their compensation,  as defined by the Plan. Participant contributions are
      limited  to  amounts  allowed  by  the  IRS.   Accordingly,   the  maximum
      Participant contribution was $10,000 in 1998 and $9,500 in 1997.

      COMPANY - The Company will contribute an amount equal to 100% of the first
      3%  of  a  Participant's   compensation  that  a  Participant  chooses  to
      contribute to the Plan.  The Company will make a further  contribution  to
      the ESOP  portion of the Plan equal to 75% of the next 3% of  compensation
      that is  contributed  to the Plan  However,  if the Company  contributions
      defined  above  (with  certain   restrictions)   plus  the  dividends  and
      investment  gains  on the  assets  of the  ESOP  portion  of the  Plan are
      insufficient  to pay the  interest  and  principal  payments  on the notes
      payable,  the Company may make  additional  contributions  as necessary to
      fully fund these  payments  when they become due. The Plan requires that a
      Participant be actively  employed and  contributing  to the Plan as of the
      last day of the Plan year in order to receive a Company contribution.

      Contributions to the ESOP portion of the Plan are  automatically  invested
      in common stock of the Company.

D.    ALLOCATION OF ESOP SHARES TO PARTICIPANTS

      The common stock of the Company  allocated to  Participants as a result of
      debt service paid by allocated  share dividend  monies is based on account
      balance.  The common stock of the Company  allocated to  Participants as a
      result of debt service  paid by  Participants'  cash  balances is based on
      cash balance. The common stock of the Company allocated to Participants as
      a result of all other debt  service is based on eligible  compensation.  A
      Participant's  eligible  compensation  is limited to amounts allowed under
      the  Tax  Reform  Act of  1986.  Accordingly,  the  maximum  Participants'
      eligible compensation was $160,000 for 1998 and 1997.

                                     - 7 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

E.    INVESTMENT OPTIONS

      Contributions  to the  Plan,  other  than  for the  ESOP  portion,  may be
      invested  in one or more of the  following  investment  funds in any whole
      percentages:

            Money Market Fund - Invested  principally in shares of the Aon Money
            -----------------
            Market Fund of the Aon Funds. The portfolio invests in various types
            of  high-quality,  short-term  money market  instruments,  including
            certificates of deposit, commercial paper, U. S. Treasury and Agency
            securities and other similar instruments.

            Aon Stock Fund - Invested principally in common stock of the Company
            --------------
            that is purchased on the open market or in private transactions.

            Investment  Contracts  Fund - Invested  principally  in  unallocated
            ---------------------------
            guaranteed insurance contracts,  U. S. Treasury bills and short-term
            investments. In 1995, members of the Company's Investment Department
            became managers of this Fund. The Investment  Manager is a fiduciary
            within the meaning of ERISA Section 3(21).  Certain restrictions and
            penalties may apply with regard to the  termination  of  unallocated
            guaranteed insurance contracts prior to scheduled maturity date.

            Government  Securities Fund - Invested  principally in shares of the
            ---------------------------
            Aon  Government  Securities  Fund of the Aon  Funds.  The  portfolio
            invests in  intermediate  and long-term  debt  securities  issued or
            guaranteed    by   the   U.S.    Government,    its    agencies   or
            instrumentalities.

            Total Return Fund - Invested  principally in shares of the Aon Asset
            -----------------
            Allocation  Fund of the Aon Funds.  The portfolio  invests in equity
            securities, long-term debt securities and money market instruments.

            Common Stock Index Fund - Invested  principally in shares of the Aon
            -----------------------
            S&P 500 Index Fund of the Aon Funds. The portfolio invests in common
            stocks traded on the New York Stock  Exchange and the American Stock
            Exchange and, to a limited extent, on the over-the-counter markets.

            Real Estate Securities Fund - Invested  principally in shares of the
            ---------------------------
            Aon  REIT  Index  Fund  of the  Aon  Funds.  The  portfolio  invests
            primarily in the  securities of REITs  comprising the Morgan Stanley
            REIT Index, which are principally  engaged in or related to the real
            estate  industry,  including  ownership of  significant  real estate
            assets. The portfolio does not invest directly in real estate.

                                     - 8 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

            International  Equity Fund - Invested  principally  in shares of the
            --------------------------
            Aon  International  Equity  Fund of the  Aon  Funds.  The  portfolio
            invests  primarily  in  equity  and  equity-related   securities  of
            companies  that are organized  outside of the United States or whose
            securities are principally traded outside the United States.

      F.    PARTICIPANT ACCOUNTS

      Each   Participant's   account  is  credited   with  the   Participant's
      contribution and a) an allocation of the Company's contributions,  b) an
      allocation of Plan  earnings,  and c) an allocation  of  Forfeitures  of
      terminated  Participants'  non-vested  accounts.  The benefit to which a
      Participant  is entitled is the  benefit  that can be provided  from the
      Participants account.

      G.    VESTING

      For the ESOP portion of the Plan, a  Participant  vests in 20%  increments
      and becomes 100% vested after  completion  of five years of Plan  Service.
      Forfeitures  of  non-vested   accounts  are  allocated  to  the  remaining
      Participants.  The amount of  forfeitures  allocated to  Participants  was
      35,293 and 31,696 shares of the  Company's  common stock in 1998 and 1997,
      respectively.

      For the  non-ESOP  portion of the Plan,  Participants  are fully vested in
      their contributions plus actual earnings thereon. Participants become 100%
      vested in the remainder of their account  balance after five years of Plan
      Service,  according  to  a  graded  schedule.  Forfeitures  of  non-vested
      accounts  are  allocated  to the  remaining  Participants.  The  amount of
      forfeitures  allocated to Participants  was $821,000 and $823,000 for 1998
      and 1997, respectively.

      H.    BENEFIT PAYMENTS

      For the ESOP portion of the Plan, a Participant's  entire account shall be
      paid to him or his  beneficiary in a lump sum upon his normal  retirement,
      permanent  disability or death.  The  Participant may elect payment in the
      form of shares or cash.

      For the non-ESOP  portion,  on termination of service,  a Participant  may
      elect to receive either a lump sum amount equal to the value of his or her
      account and/or monthly installments over a period not to exceed ten years.

      I.    PLAN TERMINATION

      Although it has not  expressed  any intent to do so, the Company has the
      right under the Plan to discontinue  its  contributions  at any time and
      to terminate the

                                     - 9 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

      Plan subject to the provisions of ERISA. In the event of Plan termination,
      Participants will become 100% vested in their accounts.

      J.    PARTICIPANT LOANS

      Under the loan  provision of the Plan,  each  Participant is permitted one
      loan in a twelve  month  period and the  outstanding  balance of all loans
      made to a  Participant  may not exceed the lesser of $50,000 or 50% of the
      vested portion of the Participant's  account excluding the ESOP portion of
      the account. The interest rate for each loan is equal to 1% plus the prime
      rate as quoted in The Wall  Street  Journal  for the last day of the month
                        -------------------------
      preceding  the loan  request.  Loans  are made for a period  of up to five
      years,  except for residential  loans which always have a repayment period
      of ten years.


2.    SIGNIFICANT ACCOUNTING POLICIES

      A.    BASIS OF ACCOUNTING

      The  financial  statements of the Plan are prepared on an accrual basis in
      accordance with generally accepted accounting principles.

      B.    INVESTMENT VALUATION

      Investments,  except for unallocated  guaranteed insurance contracts,  are
      carried  at fair  value,  which  for  marketable  securities  is  based on
      quotations obtained from national  securities  exchanges and various other
      sources.  Investments in unallocated  guaranteed  insurance  contracts are
      valued at contract value,  which represents  contributions  made under the
      contract,  plus interest at the contract rate,  less any  withdrawals  and
      administrative  expenses.  Participant  loans  are  valued  at cost  which
      approximates fair value.

      Interest income is recorded as earned.  Dividend income is recorded on the
      ex-dividend  date.  Realized  gains  or  losses  on  investments  are  the
      difference  between the proceeds received and the cost of investments sold
      as determined on a first-in, first-out basis. The change in the difference
      between fair value and the cost of  investments  is reported as unrealized
      appreciation or depreciation of investments.

      C.    ADMINISTRATIVE EXPENSES

      Administrative  expenses of the Plan,  including expenses of the Trustees,
      are allocated from the Plan assets, except to the extent that the Company,
      at its  discretion,  may  decide  to  pay  such  expenses.  Administrative
      expenses include  $1,444,000 and $860,000 in 1998 and 1997,  respectively,
      paid to subsidiaries of the Company.


                                     - 10 -
<PAGE>

2.    SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

      D.    USE OF ESTIMATES

      The  preparation of the financial  statements in conformity with generally
      accepted  accounting  principles requires management to make estimates and
      assumptions that affect the amounts  reported in the financial  statements
      and accompanying notes. Actual results could differ from those estimates.

3.    ALLOCATION OF ESOP SHARES TO PARTICIPANTS

      All  ESOP  shares  are  held by the  Plan in a  suspense  account  and are
      allocated to the Participants on an annual basis as interest and principal
      payments  are made.  The common stock  allocated  each year will equal the
      number of unallocated shares immediately before such allocation multiplied
      by the  ratio of  interest  and  principal  paid on the notes  during  the
      current Plan year to the sum of the current year payments  plus  principal
      and interest to be paid in future years. The number of shares allocated to
      Participant   accounts   was  733,941  and  709,143  for  1998  and  1997,
      respectively.

      Estimates  are used to  determine  the amount of shares to allocate to the
      Participants. These estimates are based on preliminary figures provided by
      the Company and are  continually  reviewed  and  adjusted in order for the
      Plan  to  maintain  its  IRS  qualification.  Because  the  allocation  to
      Participants is based on estimates,  the ultimate allocation may vary from
      the  estimate.  The  variances  are not  material  and are adjusted in the
      following year.

4.    INVESTMENTS

      The Northern Trust Company is the custodian of the Plan assets and Trustee
      for the Aon Stock Fund. The remaining Trustees for the Plan are members of
      the  Company's  Investment  Department,  and  they  have  been  given  the
      discretion and authority to manage the investments. The Trustees are named
      fiduciaries under ERISA.

                                     - 11 -
<PAGE>
4.    INVESTMENTS (CONTINUED)

      The Plans investments  (including investments bought, sold and held during
      the  year)  appreciated   (depreciated)  in  fair  value  as  follows  (in
      thousands):

<TABLE>
<CAPTION>
                                                                             December 31
                                                                   1998                       1997
                                                 -------------------------------------------------------
                                                               Net Realized                 Net Realized
                                                             and Unrealized               and Unrealized
                                                               Appreciation                 Appreciation
                                                              (Depreciation)               (Depreciation)
                                                                   in Value                     in Value
                                                     Current         During        Current        During
                                                       Value       the Year          Value      the Year
                                                 -------------------------------------------------------
      Investments, at fair value:
        United States Government
<S>                                              <C>            <C>            <C>           <C>
           And Agency Issues                     $    92,425    $       927    $    54,658   $        97
        Other Bonds                                     --             --             --            (192)
        Other Investments                                  5           --               14          --
        Common Stock:
          Aon Corporation                            588,097        (30,126)       392,871       118,016
          Other                                         --             --               12        10,871
        Preferred Stock                                 --             --             --             335
        Investments in the Aon Funds:
          Aon Money Market Fund                      133,933           --           29,678          --
          Aon Government Securities Fund              49,186          1,971         16,768           559
          Aon Asset Allocation Fund                  164,318          3,453         79,836        15,437
          Aon S&P 500 Index Fund                     251,594         51,162        114,739        23,751
          Aon REIT Index Fund                         19,603         (5,855)        17,923         1,935
          Aon International Equity Fund               27,014          3,035         17,234           143
         Unallocated Guaranteed Insurance
           Contracts, at contract value:
             Combined Insurance Co. of America         5,438           --            5,077          --
            Commonwealth Life Insurance Co. ..          --             --            3,065          --
            Life Insurance Company of Virginia          --             --           12,457          --
            Protective Life Insurance Company          5,406           --            5,035          --
            Provident Life and Accident
              Insurance Company                         --             --            5,255          --
            Prudential                                  --             --            6,119          --
            Sun Life Insurance Company                  --             --            5,316          --
            Travelers Insurance Company                  611           --            1,202          --

         Short-Term Investment Funds                  26,706             (2)        70,779          --
                                                 -------------------------------------------------------
           Total                                 $ 1,364,336    $    24,565    $   828,038  $    170,952
                                                 =======================================================

</TABLE>
                                     - 12 -
<PAGE>
4.    Investments (continued)


      The fair value of individual  investments that represent 5% or more of the
      Plan's net assets available for benefits is as follows (in thousands):

                                                             December 31

                                                      1998               1997
                                                      ----               ----
      Aon Corporation, Common Stock             $   588,097        $  392,871
      Investments held in the Aon Funds:
        Aon Money market Fund                       133,933                 -
        Aon Asset Allocation Fund                   164,318            79,836
        Aon S&P 500 Index Fund                      251,594           114,739
        Short-term Investment Fund                        -            70,793


                                     - 13 -
<PAGE>
<TABLE>
<CAPTION>
4.      Investments (continued)

In accordance  with SOP 94-4,  the following  represents  disclosures  for fully
benefit responsive guaranteed investment contracts:

                                                                1998       1997
                                             1998     1997    Crediting Crediting
                                            Average  Average  Interest   Interest    Contract    Approximate
Description                                  Yield    Yield     Rate       Rate        Value     Fair Value
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------------------------------------------
<S>                                          <C>      <C>       <C>       <C>       <C>          <C>
Combined Insurance Company of America        6.88%    6.88%     7.12%     7.12%     $5,438,192   $5,438,192
Protective Life Insurance Company            7.10%    7.10%     7.36%     7.36%      5,405,528    5,405,528
Travelers Insurance Company                  4.42%    4.02%     4.00%     4.00%       611,005      611,005
Commonwealth Life Insurance Company          ----     5.21%     5.35%     5.35%        ----         ----
Life Insurance Company of Virginia           ----     5.51%     5.67%     5.67%        ----         ----
Provident Life & Accident Insurance Company  ----     5.63%     5.79%     5.79%        ----         ----
The Prudential                               ----     5.07%     5.20%     5.20%        ----         ----
Sun Life Insurance Company                   ----     5.84%     6.02%     6.02%        ----         ----
                                                                                   ==========================
                                                                                    $11,454,725  $11,454,725
                                                                                   ==========================

</TABLE>

The Plan Administrator believes contract value approximates fair value.

                                     - 14 -
<PAGE>
5.    RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

      The following is a reconciliation of net assets available for benefits per
      the financial statements to Form 5500 (in thousands):

                                                              December 31,
                                                                 1998
                                                            ---------------
      Net assets available for benefits per
        the financial statements                            $     1,400,365

      Amounts allocated to withdrawing participants                  (4,508)

      Net assets available for benefits per Form 5500       $     1,395,857
                                                            ===============

      The following is a reconciliation of benefits paid to participants per the
      financial statements to Form 5500 (in thousands):

                                                               Year Ended
                                                              December 31,
                                                                 1998
                                                            ---------------
      Benefits paid to participants per the
        financial statements                                $       122,452
      Add: Amounts allocated to withdrawing participants
        at December 31, 1998                                          4,508
      Less: Amounts allocated to withdrawing participants
        at December 31, 1997                                              -
                                                            ---------------
      Benefits paid to participants per Form 5500           $       126,960
                                                            ===============


      Amounts  allocated to withdrawing  participants  are recorded on Form 5500
      for benefit claims that have been processed and approved for payment prior
      to December 31 but not yet paid as of that date.

6.    NOTES PAYABLE

      The  Plan  originally   borrowed   $90,000,000   from  various   financial
      institutions to purchase  5,383,326  shares of the Company's common stock.
      The notes are unconditionally  guaranteed by the Company.  Pursuant to the
      ESOP note agreement,  there is a provision for an interest rate adjustment
      in the event there is a change in the  Federal  Tax Rate.  During 1998 and
      1997, the interest rate on the notes was 8.35%.  The notes were segregated
      into two series,  Series A and Series B.  During  1998 and 1997,  interest
      paid was approximately $2,384,000 and $3,533,000, respectively.

      The  Series A note  allowed  the Plan to borrow up to  $43,900,000.  Final
      payment was made on June 15, 1996.


                                     - 15 -
<PAGE>
6.    NOTES PAYABLE (CONTINUED)

      The Series B note allowed the Plan to borrow up to $46,100,000.  Principal
      payments are scheduled to be repaid annually beginning September 15, 1997.
      Principal  repayments  during  1998  were  $15,600,000.  Interest  is paid
      semi-annually.  At  December  31,  1998,  the  Series B note  balance  was
      $17,500,000.  The final principal payment of $17,500,000 is due to be paid
      on June 15, 1999.

7.    FEDERAL INCOME TAXES

      The IRS ruled on April  10,  1995 that the Plan  qualified  under  Section
      401(a) and (k) of the IRC and therefore,  the related trust is not subject
      to tax under present income tax law. Once qualified,  the Plan is required
      to operate in conformity with the IRC to maintain its  qualification.  The
      Plan  Administrative  Committee  believes the Plan is qualified  under the
      relevant  sections of the Code and is not aware of any course of action or
      series of events that have occurred that might adversely affect the Plan's
      qualified status.

8.    YEAR 2000 ISSUE (UNAUDITED)

      The Plan Sponsor has determined  that it will be necessary to take certain
      steps in order to ensure that the Plan's information  systems are prepared
      to  handle  year  2000  dates.  The Plan  Sponsor  is  taking a two  phase
      approach. The first phase addresses internal systems that must be modified
      or replaced to function properly. Both internal and external resources are
      being utilized to replace or modify existing  software  applications,  and
      test the software and equipment for the year 2000 modifications.  The Plan
      Sponsor anticipates  substantially completing this phase of the project by
      fall of 1999. Cost  associated  with modifying  software and equipment are
      not estimated to be significant and will be paid by the Plan Sponsor.

      For the second phase of the project,  Plan management  established  formal
      communications  with its third party service  providers to determine  that
      they have developed  plans to address their own year 2000 problems as they
      relate to the Plan's  operations.  All third party service  providers have
      indicated  that  they  will be  year  2000  compliant  by  late  1999.  If
      modification of data processing  systems of either the Plan, Plan Sponsor,
      or its service  providers is not completed  timely,  the year 2000 problem
      could  have  a  material  impact  on the  operations  of  the  Plan.  Plan
      management  has  not  developed  a  contingency  plan,  because  they  are
      confident that all systems will be year 2000 ready.

9.    SUBSEQUENT EVENT

      Effective  August 1, 1999,  INVESCO  was  appointed  custodian  and record
      keeper of the Plan.

- - - - - - - - - - - - - - - - - - 16 -
<PAGE>
<TABLE>
<CAPTION>
                                              Employer Identification:36-3051915
                                                                      Plan # 020

                                AON SAVINGS PLAN
           Line 27a - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
                                December 31, 1998


                                                   Number of Shares
                                                   ----------------      Cost      Current Value
Identity of Issuer                                 Principal Amount   (thousands)   (thousands)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------
<S>                                                   <C>           <C>            <C>
MONEY MARKET FUND
- - - - - - - - - - - - - - - - - -----------------
MUTUAL FUND

     Investments held in the Aon Funds
     Money Market Fund*                               133,932,863   $    133,933   $    133,933

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                           57,301             57             57
                                                                    ------------   ------------

Total Money Market Fund                                             $    133,990   $    133,990
                                                                    ============   ============


Aon STOCK FUND
    ----------
COMMON STOCK

     Aon Corporation
     Common Stock, $1.00 par*                           6,654,553   $    149,120   $    368,496

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                        4,228,490          4,228          4,228
                                                                    ------------   ------------

Total Aon Stock Fund                                                $    153,348   $    372,724
                                                                    ============   ============


INVESTMENT CONTRACT FUND
- - - - - - - - - - - - - - - - - ------------------------

UNALLOCATED INSURANCE CONTRACTS

     Combined Insurance Co. of America
     Contract  #CG1000
     7.12% due 6/30/99                                  5,438,192   $      5,438   $      5,438

     Protective Life Insurance Company
     Contract # GA-1065
     7.36% due 3/31/99                                  5,405,528          5,406          5,406

</TABLE>

                                       17
<PAGE>
<TABLE>
<CAPTION>

                                                   Number of Shares
                                                   ----------------      Cost      Current Value
Identity of Issuer                                 Principal Amount   (thousands)   (thousands)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------
<S>                                                       <C>       <C>            <C>

     Travelers Insurance Co.
     Contract #GR-9039
     4%                                                   611,005            611            611
                                                                    ------------   ------------

Total Unallocated Guaranteed Insurance Contracts                          11,455         11,455
                                                                    ------------   ------------

U.S. GOVERNMENT AND GOVERNMENT
   AGENCY ISSUES

     U.S. Treasury Security -
        Stripped Interest Payments
      due 3/25/1999                                    50,000,000         49,660         49,733

     U.S. Treasury Bill
      due 3/25/1999                                    25,000,000         24,731         24,759

     U.S. Treasury Bill
      due 2/4/1999                                     18,000,000         17,921         17,933
                                                                    ------------   ------------

                                                                          92,312         92,425
                                                                    ------------   ------------

OTHER

      Wachovia Real Estate Fund                                10              7              5
                                                                    ------------   ------------

                                                                               7              5
                                                                    ------------   ------------

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                       13,479,474         13,479         13,479
                                                                    ------------   ------------


Total Short-Term Investments                               13,479         13,479
                                                                    ------------   ------------

Total Investment Contract Fund                                      $    117,253   $    117,364
                                                                    ============   ============

GOVERNMENT SECURITIES FUND
- - - - - - - - - - - - - - - - - ----------
MUTUAL FUND

     Investments held in the Aon Funds
     Government Securities Fund*                        4,601,111   $     48,695   $     49,186

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                          335,248            335            335
                                                                    ------------   ------------

Total Government Securities Fund                                    $     49,030   $     49,521
                                                                    ============   ============

</TABLE>

                                       18
<PAGE>

<TABLE>
<CAPTION>
                                                   Number of Shares
                                                   ----------------      Cost      Current Value
Identity of Issuer                                 Principal Amount   (thousands)   (thousands)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------
<S>                                                   <C>           <C>            <C>
TOTAL RETURN FUND
- - - - - - - - - - - - - - - - - -----------------

MUTUAL FUND

     Investments held in the Aon Funds
     Asset Allocation Fund*                             9,757,576   $    153,174   $    164,318

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                        3,864,722          3,865          3,865
                                                                    ------------   ------------

Total Total Return Fund                                             $    157,039   $    168,183
                                                                    ============   ============

COMMON STOCK INDEX FUND
- - - - - - - - - - - - - - - - - -----------------------

MUTUAL FUND

     Investments held in the Aon Funds
     S&P 500 Index Fund*                               13,931,034   $    189,562   $    251,594

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                          423,312            423            423
                                                                    ------------   ------------

Total Common Stock Index Fund                                       $    189,985   $    252,017
                                                                    ============   ============


REAL ESTATE SECURITIES FUND
- - - - - - - - - - - - - - - - - ---------------------------

MUTUAL FUND

     Investments held in the Aon Funds
     REIT Index Fund*                                   1,826,960   $     23,645   $     19,603

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                        1,111,719          1,112          1,112
                                                                    ------------   ------------

Total Real Estate Securities Fund                                   $     24,757   $     20,715
                                                                    ============   ============

INTERNATIONAL EQUITY FUND
- - - - - - - - - - - - - - - - - -------------------------

MUTUAL FUND

     Investments held in the Aon Funds
     International Equity Fund*                         2,203,453   $     24,224   $     27,014

</TABLE>

                                       19
<PAGE>

<TABLE>
<CAPTION>
                                                   Number of Shares
                                                   ----------------      Cost      Current Value
Identity of Issuer                                 Principal Amount   (thousands)   (thousands)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------
<S>                                                   <C>           <C>            <C>
SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                          205,828            206            206
                                                                    ------------   ------------

Total International Equity Fund                                     $     24,430   $     27,220
                                                                    ============   ============

ESOP ALLOCATED  FUND
- - - - - - - - - - - - - - - - - --------------------

COMMON STOCK

     Aon Corporation
     Common Stock, $1.00 par*                           3,965,719   $     65,865   $    219,601

SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                        2,323,882          2,324          2,324
                                                                    ------------   ------------

Total Esop Allocated Fund                                           $     68,189   $    221,925
                                                                    ============   ============

ESOP UNALLOCATED  FUND
- - - - - - - - - - - - - - - - - ----------------------
SHORT-TERM INVESTMENTS

     Short-Term Investment Fund,
     Collective Trust Funds of
     The Northern Trust Company*                          676,660   $        677   $        677
                                                                    ------------   ------------

Total ESOP Unallocated Fund                                         $        677   $        677
                                                                    ============   ============


     PARTICIPANT LOANS (7%-11%)                              --             --           13,161


                                                                    $    918,698   $  1,377,497
                                                                    ============   ============
</TABLE>
* Party in interest transaction not prohibited by ERISA.

                                       20
<PAGE>
<TABLE>
<CAPTION>
                                                    Aon Savings Plan                           Employer Identification # 36-3051915
                                                                                                                         Plan # 020
                                         Line 27d - Schedule of Reportable Transactions

                                                 Year Ended December 31, 1998
                                                                                                          Current
                                                                                                          Value of
                                                                                                          Asset on
                                                               Purchase      Selling        Cost of     Transaction      Net Gain
Identity of Party Involved   Description of Assets              Price         Price          Asset          Date          (Loss)
====================================================================================================================================
<S>                          <C>                           <C>            <C>                          <C>           <C>


Category  (i)  - A  single  transaction  in  excess of  5%  of  Plan   Assets
- - - - - - - - - - - - - - - - - -----------------------------------------------------------


The Northern Trust           Benchmark Diversified
     Company*                Asset Portfolio               $  279,900,000 $             $  279,900,000 $ 279,900,000 $
                                                                             63,860,493     63,860,493    63,860,493               -

Category  (iii)  -  Series of  transactions in excess of  5% of Plan  Assets
- - - - - - - - - - - - - - - - - -----------------------------------------------------------


U.S. Treasury Security       9.0% due 2/15/98 and 2/19/98      38,530,440             -     38,530,440    38,530,440               -
                                                                        -    39,000,000     38,530,440    39,000,000         469,560

Aon Corporation              Common Stock                      29,399,024             -     29,399,024    29,399,024               -
                                                                        -    46,551,327     10,081,669    46,551,327      36,469,658

Aon Funds                    Money Market Mutual Fund         155,634,503             -    155,634,503   155,634,503               -
                                                                        -    51,380,000     51,380,000    51,380,000               -

Aon Funds                    Asset Allocation Mutual Fund      96,835,416             -     96,835,416    96,835,416               -
                                                                        -    13,400,000     10,400,648    13,400,000       2,999,352

Aon Funds                    S&P 500 Index Mutual Fund        110,467,054             -    110,467,054   110,467,054               -
                                                                        -    24,250,000     17,086,406    24,250,000       7,163,594

The Northern Trust           Benchmark Diversified
          Company*           Asset Portfolio                  543,630,541             -    543,630,541   543,630,541               -
                                                                        -   587,703,541    587,703,541   587,703,541               -
<FN>
There were no category (ii) or (iv) reportable transactions during 1998.

*Represents Party in interest to the Plan not prohibited by ERISA.
</FN>
</TABLE>


                                     - 21 -
<PAGE>

                         CONSENT OF INDEPENDENT AUDITORS


    We consent to the  incorporation by reference in the Registration  Statement
    (Form  S-8  No.  33-27894)  pertaining  to  the  Aon  Savings  Plan  of  Aon
    Corporation of our report dated June 11, 1999, with respect to the financial
    statements  and  schedules of the Aon Savings  Plan  included in this Annual
    Report (Form 11-K) for the year ended December 31, 1998.


                                                       ERNST & YOUNG LLP





    Chicago, Illinois
    June 28, 1999
<PAGE>
June 25, 1999





Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.   20549

      RE:   REPORT ON FORM 11-K FOR THE AON SAVINGS PLAN
            REGISTRANT:  AON CORPORATION
            COMMISSION FILE NO.:  1-7933


Gentlemen and Ladies:

      Enclosed with this EDGAR  transmission  is the above  referenced Form 11-K
for the Aon Savings Plan.

      Pursuant to Securities Act Release No.  33-7331,  no filing fee is being
paid herewith as it was eliminated effective October 7, 1996.

      Please contact the undersigned at 312/701-3835 if you have any questions.

Very truly yours,


/S/ JEROME S. HANNER

Jerome S. Hanner
Senior Counsel

JSH/adc
Enclosures


<PAGE>


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