AON CORP
10-Q, 1998-08-14
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

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

                  FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1998

                                       OR

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

                          Commission file number 1-7933

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

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



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

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


Indicate  by check  mark  whether  the  Registrant:  (1) has filed  all  reports
required to be filed by Section 13 or 15(d) of the  Securities  and Exchange Act
of 1934  during the  preceding  12 months (or for such  shorter  period that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. YES  X  NO
                                              ---    ---

Number of shares of common stock outstanding:

                                                          No. Outstanding
                   Class                                   as of 6-30-98
                   -----                                   -------------

           $1.00 par value Common                           168,856,896





<PAGE>
<TABLE>
<CAPTION>
                                     PART 1
                              FINANCIAL INFORMATION
                                 AON CORPORATION
            CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION


 (millions)                                          AS OF             AS OF
                                                 JUNE 30, 1998     DEC. 31, 1997
                                               -----------------------------------
 ASSETS                                           (UNAUDITED)

 INVESTMENTS

<S>                                                   <C>               <C>      
   Fixed maturities at fair value                $      3,076.8      $    3,143.6

   Equity securities at fair value                        800.4             806.3

   Short-term investments                               2,363.1           1,697.7

   Other investments                                      304.4             274.5

                                               ----------------- -----------------
       TOTAL INVESTMENTS                                6,544.7           5,922.1


 CASH                                                   1,034.4           1,084.7


 RECEIVABLES

   Insurance brokerage and consulting
        services                                        5,564.2           5,320.5

   Premiums and other                                   1,108.7             862.6

   Accrued investment income                               60.8              66.8

                                               ----------------- -----------------
       TOTAL RECEIVABLES                                6,733.7           6,249.9





 INTANGIBLE ASSETS                                      3,273.6           3,094.5


 OTHER ASSETS                                           2,258.8           2,340.0


                                               ----------------- -----------------
       TOTAL ASSETS                              $   $ 19,845.2      $   18,691.2
                                               ================= =================


                                                      AS OF             AS OF
                                                  JUNE 30, 1998     DEC. 31, 1997
                                               -----------------------------------
 LIABILITIES AND EQUITY                          (UNAUDITED)

 POLICY LIABILITIES
   Future policy benefits                        $        946.7      $      942.6
   Policy and contract claims                             797.5             809.4
   Unearned and advance premiums                        1,874.4           1,869.7
   Other policyholder funds                             1,032.9             828.1
                                               ----------------- -----------------
       TOTAL POLICY LIABILITIES                         4,651.5           4,449.8


 GENERAL LIABILITIES
   Insurance premiums payable                           6,941.1           6,379.8
   Commissions and general expenses                     1,415.2           1,488.8
   Short-term borrowings                                  931.2             764.2
   Notes payable                                          624.5             637.1
   Other liabilities                                    1,406.6           1,299.4
                                               ----------------- -----------------
       TOTAL LIABILITIES                               15,970.1          15,019.1


 COMMITMENTS AND CONTINGENT LIABILITIES

 REDEEMABLE PREFERRED STOCK                                50.0              50.0

 COMPANY-OBLIGATED MANDATORILY REDEEMABLE
   PREFERRED CAPITAL SECURITIES OF SUBSIDIARY
   TRUST HOLDING SOLELY THE COMPANY'S JUNIOR
   SUBORDINATED DEBENTURES                                800.0             800.0


 STOCKHOLDERS' EQUITY
   Common stock - $1 par value                            171.5             171.5
   Paid-in additional capital                             395.4             377.0
   Net unrealized investment gains                        176.6             189.0
   Net foreign exchange losses                            (91.4)            (85.6)
   Retained earnings                                    2,654.8           2,463.4
   Less - Treasury stock at cost                          (73.2)            (93.2)
             Deferred compensation                       (208.6)           (200.0)
                                               ----------------- -----------------
       TOTAL STOCKHOLDERS' EQUITY                       3,025.1           2,822.1

                                               ----------------- -----------------
       TOTAL LIABILITIES AND EQUITY              $     19,845.2      $   18,691.2
                                               ================= =================
<FN>
See the accompanying notes to the condensed consolidated financial statements.
</FN>
</TABLE>

                                     - 2 -
<PAGE>
<TABLE>
<CAPTION>
                                 Aon CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)

                                                                                      Second Quarter Ended
                                                                           ---------------------------------------
(millions except per share data)                                              June 30,    June 30,       Percent 
                                                                                1998        1997         Change
                                                                           ------------ ------------  ------------

Revenue
<S>                                                                        <C>          <C>                  <C>  
   Brokerage commissions and fees                                          $    1,059.5 $      885.0         19.7%
   Premiums and other                                                             423.4        421.9          0.4
   Investment income                                                              140.1        117.6         19.1
                                                                           ------------ ------------  ------------
      Total revenue                                                             1,623.0      1,424.5         13.9
                                                                           ------------ ------------  ------------

Expenses
   General expenses                                                             1,104.2        980.7         12.6
   Benefits to policyholders                                                      226.8        215.6          5.2
   Interest expense                                                                21.2         15.9         33.3
   Amortization of intangible assets                                               31.2         33.4         (6.6)
   Special charges                                                                  --          27.0          --
                                                                           ------------ ------------  ------------
      Total expenses                                                            1,383.4      1,272.6          8.7
                                                                           ------------ ------------  ------------

Income Before Income Tax and Minority Interest                                    239.6        151.9         57.7
   Provision for income tax                                                        89.8         57.0         57.5
                                                                           ------------ ------------  ------------
Income Before Minority Interest                                                   149.8         94.9         57.9
   Minority interest - 8.205% mandatorily redeemable
    preferred capital securities                                                  (10.3)       (10.7)         N/A
                                                                           ------------ ------------  ------------
Net Income                                                                 $      139.5 $       84.2         65.7%
                                                                           ============ ============  ============
Net Income Available for Common Stockholders                               $      138.8 $       80.9         71.6%
                                                                           ============ ============  ============

Net Income Per Share:
   Basic net income per share                                              $       0.82 $       0.48         70.8%
                                                                           ============ ============  ============
   Dilutive net income per share                                           $       0.81 $       0.48         68.8%
                                                                           ============ ============  ============

Cash dividends paid on common stock                                        $       0.28 $       0.26
                                                                           ============ ============  

  Dilutive average common and common equivalent shares outstanding                172.2        169.6
                                                                           ------------ ------------ 


                                                                                       Six Months Ended
                                                                           ---------------------------------------
 (millions except per share data)                                             June 30,    June 30,       Percent 
                                                                                1998        1997         Change
                                                                           ------------ ------------  ------------
Revenue
   Brokerage commissions and fees                                          $    2,055.7 $    1,726.7         19.1%
   Premiums and other                                                             840.2        816.3          2.9
   Investment income                                                              288.6        235.8         22.4
                                                                           ------------ ------------  ------------
      Total revenue                                                             3,184.5      2,778.8         14.6
                                                                           ------------ ------------  ------------

Expenses
   General expenses                                                             2,152.4      1,923.6         11.9
   Benefits to policyholders                                                      452.7        420.8          7.6
   Interest expense                                                                41.3         30.6         35.0
   Amortization of intangible assets                                               60.7         64.7         (6.2)
   Special charges                                                                  --         172.0          --
                                                                           ------------ ------------  ------------
      Total expenses                                                            2,707.1      2,611.7          3.7
                                                                           ------------ ------------  ------------

Income Before Income Tax and Minority Interest                                    477.4        167.1        185.7
   Provision for income tax                                                       179.0         62.7        185.5
                                                                           ------------ ------------  ------------
Income Before Minority Interest                                                   298.4        104.4        185.8
   Minority interest - 8.205% mandatorily redeemable
    preferred capital securities                                                  (20.6)       (19.5)         N/A
                                                                           ------------ ------------  ------------
Net Income                                                                 $      277.8 $       84.9        227.2%
                                                                           ============ ============  ============
Net Income Available for Common Stockholders                               $      276.5 $       78.2        253.6%
                                                                           ============ ============  ============

Net Income Per Share:
   Basic net income per share                                              $       1.64 $       0.47        248.9%
                                                                           ============ ============  ============
   Dilutive net income per share                                           $       1.61 $       0.46        250.0%
                                                                           ============ ============  ============

Cash dividends paid on common stock                                        $       0.54 $       0.50
                                                                           ============ ============ 

  Dilutive average common and common equivalent shares outstanding                171.7        169.5
                                                                           ------------ ------------ 

<FN>
See the accompanying notes to the condensed consolidated financial statements.
</FN>
</TABLE>

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


                                                                                               Six Months Ended
                                                                                   --------------------------------------
                                                                                          June 30,             June 30,
 (millions)                                                                                 1998                1997
                                                                                   ------------------   -----------------

<S>                                                                                          <C>                 <C>    
 CASH PROVIDED BY OPERATING ACTIVITIES ........................................          $     784.2         $     294.3

 CASH FLOWS FROM INVESTING ACTIVITIES:
   Sale of investments
       Fixed maturities
           Maturities .........................................................                 59.2                61.3
           Calls and prepayments ..............................................                 36.1                72.9
           Sales ..............................................................              1,748.7               526.6
       Equity securities ......................................................              1,481.2               639.1
       Other investments ......................................................                 26.8                32.9
   Purchase of investments
       Fixed maturities .......................................................             (1,776.1)             (757.9)
       Equity securities ......................................................             (1,485.5)             (655.8)
       Other investments ......................................................               (109.3)              (38.1)
  Sale (purchase) of short-term investments - net..............................               (703.0)              285.5
  Acquisition of subsidiaries .................................................               (263.0)           (1,288.8)
  Acquired fiduciary funds from acquisitions ..................................                   -                734.0
  Property and equipment and other ............................................               (105.0)              (28.7)
                                                                                   ------------------   -----------------
           CASH USED BY INVESTING ACTIVITIES ..................................             (1,089.9)             (417.0)
                                                                                   ------------------   -----------------

 CASH FLOWS FROM FINANCING ACTIVITIES:
    Treasury stock transactions - net .........................................                 14.9                21.9
    Issuance of short-term borrowings - net ...................................                167.0               258.0
    Issuance of mandatorily redeemable preferred capital securities ...........                  -                 800.0
    Repayment of long-term debt ...............................................                (12.7)              (71.8)
    Interest sensitive life, annuity and investment contracts
       Deposits ...............................................................                221.0               154.1
       Withdrawals ............................................................                (48.3)               (6.8)
    Cash dividends to stockholders ............................................                (91.5)              (88.9)
                                                                                   ------------------   -----------------
           CASH PROVIDED BY FINANCING ACTIVITIES ..............................                250.4             1,066.5
                                                                                   ------------------   -----------------

 EFFECT OF EXCHANGE RATE CHANGES ON CASH ......................................                  5.0               (22.3)
 INCREASE (DECREASE) IN CASH ..................................................                (50.3)              921.5
 CASH AT BEGINNING OF PERIOD ..................................................              1,084.7               410.1
                                                                                   ------------------   -----------------
 CASH AT END OF PERIOD ........................................................          $   1,034.4         $   1,331.6
                                                                                   ------------------   -----------------

<FN>
See the accompanying notes to condensed consolidated financial statements.
</FN>
</TABLE>

                                     - 4 -
<PAGE>

               NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

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

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

      Refer to the  consolidated  financial  statements  and notes in the Annual
      Report to Stockholders for the year ended December 31, 1997 for additional
      details  of Aon's  financial  position,  as well as a  description  of the
      accounting policies which have been continued without material change. The
      details  included  in the  notes  have not  changed  except as a result of
      normal  transactions  in the  interim  and  the  events  mentioned  in the
      footnotes below.

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


2.    Statements of Financial Accounting Standards (SFAS)
      ---------------------------------------------------

      Comprehensive Income
      --------------------

      As of January 1, 1998, Aon adopted the interim  reporting  requirements of
      Financial  Accounting  Standards Board (FASB) Statement No. 130 (Reporting
      Comprehensive  Income) as presented  below.  Statement No. 130 establishes
      new rules for the  reporting and display of  comprehensive  income and its
      components; however, the adoption of this Statement had no impact on Aon's
      net  income or  stockholders'  equity.  Statement  No.  130  requires  net
      unrealized   investment  gains  or  losses  on  Aon's   available-for-sale
      securities and net foreign  exchange gains or losses,  which currently are
      reported in  stockholders'  equity,  to be included in  accumulated  other
      comprehensive income and the disclosure of comprehensive  income. When Aon
      adopts the fiscal year end reporting  requirements of Statement No. 130 in
      its  December 31, 1998  financial  statements,  the totals of  accumulated
      other comprehensive  income items and comprehensive income (which includes
      net  income),  will be  displayed  separately  and  prior  year  financial
      statements  will  be  reclassified  to  conform  to  the  requirements  of
      Statement No. 130.

      The  components of  comprehensive  income,  net  of  related  tax, for the
      second quarter ended June 30, 1998 and 1997 are as follows:

             (millions)                                 1998            1997
                                                        ----            ----

             Net income                             $     139.5   $     84.2
             Net unrealized investment gains(losses)       (5.8)        40.2
             Net foreign exchange losses                   (8.1)       (11.5)
                                                    ------------  -----------
             Comprehensive income                   $     125.6   $    112.9
                                                    ============  ===========

                                     - 5 -
<PAGE>
      The  components of  comprehensive  income, net  of  related  tax, for  the
      six months ended June 30, 1998 and 1997 are as follows:


              (millions)                                1998            1997
                                                        ----            ----

             Net income                             $     277.8   $     84.9
             Net unrealized investment gains(losses)      (12.4)         6.1
             Net foreign exchange losses                   (5.8)       (47.1)
                                                    ------------  -----------
             Comprehensive income                   $     259.6   $     43.9
                                                    ============  ===========



      The components  of accumulated other comprehensive  income, net of related
      tax, at June 30, 1998 and December 31, 1997, are as follows:

             (millions)                                  1998           1997
                                                         ----           ----

             Net unrealized investment gains        $     176.6   $    189.0
             Net foreign exchange losses                  (91.4)       (85.6)
                                                    ------------  -----------
             Accumulated other comprehensive income $      85.2   $    103.4
                                                    ============  ===========



      Segments Disclosure
      -------------------
      In 1997, the FASB issued Statement No. 131 (Disclosures  about Segments of
      an Enterprise  and Related  Information).  Statement  No. 131  establishes
      standards  for  providing  disclosures  related to products and  services,
      geographic  areas, and major  customers.  Aon will adopt this statement in
      its fourth quarter 1998 financial  statements as required.  Implementation
      of this  statement  is not  expected  to have a  material  effect on Aon's
      financial statements.

      Derivatives Disclosure
      ----------------------
      In June 1998, the FASB issued Statement No. 133 (Accounting for Derivative
      Instruments  and Hedging  Activities).  This  Statement  is required to be
      adopted in fiscal years  beginning after June 15, 1999 with early adoption
      permitted as of the  beginning of any quarter  subsequent to its issuance.
      Aon has not yet decided  when it will adopt the new  statement.  Statement
      No. 133  establishes  accounting  and reporting  standards for  derivative
      instruments and for hedging activities and will require Aon  to  recognize
      all derivatives on the statement of financial  position at fair value. Aon
      has not  yet   determined  the effect  this  statement  will have on Aon's
      earnings and financial position.


3.    Capital Stock
      -------------

      In first half  1998,  Aon  reissued  538,500  shares of common  stock from
      treasury for employee  benefit plans.  Aon purchased  85,600 shares of its
      common  stock at a total cost of $4.3 million  during  first half 1998. In
      addition,  Aon reissued  381,900 shares of common stock  from  treasury in
      connection with business combinations.  There  were  2.7 million shares of
      common stock held in treasury at June 30, 1998.


                                     - 6 -
<PAGE>
4.    Capital Securities
      ------------------

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


5.    Business Combinations
      ---------------------

      In first half 1998,  operating  results  were  impacted  by the  insurance
      brokerage  acquisitions of Le Blanc de Nicolay  (the  largest  reinsurance
      broker in France) and Gil y Carvajal (the largest  retail and  reinsurance
      broker in Spain).  These  acquisitions  were accounted for by the purchase
      method and their effect was not material to Aon's  consolidated  financial
      statements.

      In third quarter 1998, Aon anticipates the completion of certain insurance
      brokerage  acquisitions.  These  acquisitions will be accounted for by the
      purchase  method and their  effect is not  anticipated  to be  material to
      Aon's consolidated financial statements.


6.    Earnings Per Share
      ------------------

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

                                                      Second Quarter Ended
                                              ----------------------------------
            (millions except per share data)      June 30, 1998    June 30, 1997
            --------------------------------------------------------------------

            Net income                          $        139.5   $         84.2
            8% preferred stock dividends                     -              2.7
            Redeemable preferred stock dividends           0.7              0.6
                                                --------------------------------
            Net income for dilutive and basic   $        138.8   $         80.9
                                                ================================

            Basic shares outstanding                     169.3            167.6
            Common stock equivalents                       2.9              2.0
                                                --------------------------------
            Dilutive potential common shares             172.2            169.6
            --------------------------------------------------------------------
            Basic earnings per share                     $0.82           $0.48
            Dilutive earnings per share                  $0.81           $0.48
            --------------------------------------------------------------------


                                     - 7 -
<PAGE>

                                                        Six Months Ended
                                                --------------------------------
            (millions except per share data)      June 30, 1998    June 30, 1997
            --------------------------------------------------------------------

            Net income                          $        277.8   $         84.9
            8% preferred stock dividends                     -              5.4
            Redeemable preferred stock dividends           1.3              1.3
                                                --------------------------------
            Net income for dilutive and basic   $        276.5   $         78.2 
                                                ================================

            Basic shares outstanding                     168.9            167.3
            Common stock equivalents                       2.8              2.2
                                                --------------------------------
            Dilutive potential common shares             171.7            169.5
            --------------------------------------------------------------------
            Basic earnings per share                     $1.64            $0.47
            Dilutive earnings per share                  $1.61            $0.46
            --------------------------------------------------------------------


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

      A&A  discontinued its insurance  underwriting  operations in 1985, some of
      which were then  placed  into  run-off,  the  remainder  sold in 1987.  In
      connection with those sales, A&A provided indemnities to the purchaser for
      various estimated and potential liabilities, including provisions to cover
      future losses attributable to insurance pooling arrangements,  a stop-loss
      reinsurance  agreement,  and actions or omissions by various  underwriting
      agencies previously managed by an A&A subsidiary. As of June 30, 1998, the
      liabilities  associated with the foregoing  indemnities and liabilities of
      insurance  underwriting  subsidiaries  that are  currently in run-off were
      included in other liabilities in the accompanying  condensed  consolidated
      statement  of  financial  position  and  amounted  to $152  million.  Such
      liabilities are net of reinsurance  recoverables  and other assets of $184
      million.


8.    Contingencies
      -------------

      Aon and its  subsidiaries are subject to numerous claims and lawsuits that
      arise in the ordinary  course of  business.  Some of these cases are being
      litigated in jurisdictions  which have judicial precedents and evidentiary
      rules which are generally believed to favor individual  plaintiffs against
      corporate  defendants.  The damages that may be claimed in these and other
      jurisdictions  are  substantial,  including in many  instances  claims for
      punitive or extraordinary  damages.  Accruals for these lawsuits have been
      provided to the extent that losses are deemed probable and are estimable.

      At the time of Aon's  acquisition  of A&A in January 1997,  A&A was facing
      various  legal  claims,   several  of  which  remain  ongoing.  While  the
      possibility of substantial  exposure  remains,  based on current facts and
      circumstances,  Aon believes the  possibility  of material loss  resulting
      from these exposures is remote.


                                     - 8 -
<PAGE>
      Although the ultimate  outcome of these suits  cannot be  ascertained  and
      liabilities  in  indeterminate  amounts  may  be  imposed  on  Aon  or its
      subsidiaries,  on  the  basis  of  present  information,  availability  of
      insurance coverages and advice received from counsel, it is the opinion of
      management that the disposition or ultimate  determination  of such claims
      and lawsuits will not have a material  adverse effect on the  consolidated
      financial position of Aon.


                                     - 9 -
<PAGE>
                                 Aon CORPORATION
                   MANAGEMENT'S ANALYSIS OF OPERATING RESULTS
                             AND FINANCIAL CONDITION

                      REVENUE AND INCOME BEFORE INCOME TAX
                     FOR SECOND QUARTER AND FIRST HALF 1998


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

GENERAL
- - - - - - - - - - - - - - - - - -------
Certain amounts in the prior years' condensed  consolidated financial statements
have been reclassified to conform to the 1998 presentation.

Brokerage  commissions  and fees  increased  $174.5  million  or 19.7%  and $329
million or 19.1% in second quarter and first half 1998, respectively,  primarily
reflecting business combination activity related to the acquisitions of Le Blanc
de Nicolay (Le Blanc) in second  quarter  1998,  Gil y Carvajal in first quarter
1998, Jauch & Hubener in fourth quarter 1997 and, to a lesser extent,  Minet and
certain other 1997 brokerage acquisitions.

Premiums and other is primarily  related to insurance  underwriting  operations.
Premiums and other  increased  $1.5 million or 0.4% and $23.9 million or 2.9% in
second quarter and first half 1998, respectively,  compared with the same period
last year.  Extended  warranty premiums earned increased $7.9 million or 6.2% in
the  quarter  reflecting  continued  growth,  primarily  in  the  appliance  and
electronic  lines.  Direct sales premiums  earned  increased 0.6% as a result of
changes in the consumer  insurance  market.  The runoff of North  American  auto
credit business partially offset this growth in premiums earned.

Investment  income,  which  includes  related  expenses and realized  investment
gains, increased $22.5 million or 19.1% and $52.8 million or 22.4% in the second
quarter  and  first  half  1998,  respectively,  when  compared  to prior  year.
Investment  income  growth was  primarily  related to  insurance  brokerage  and
consulting  acquisitions in 1998 and in  second  half  1997.  Higher  levels  of
income  received  on private  equity  and other  investment  holdings  in second
quarter 1998 and first half 1998 contributed to overall investment income growth
when  compared to prior year.  Investment  income from  insurance  brokerage and
consulting  operations,  primarily relating to fiduciary funds, increased to $50
million in second  quarter 1998 from $38 million in 1997,  and to $94 million in
first half 1998 from $77 million in 1997, due to brokerage  acquisition activity
and internal growth.

Total revenue  increased  $198.5 million or 13.9% and $405.7 million or 14.6% in
the second quarter and first half 1998, respectively,  primarily attributable to
brokerage acquisition activity .

Benefits to  policyholders  increased $11.2 million or 5.2% and $31.9 million or
7.6% million in second quarter and first half 1998,  respectively,  reflecting a
higher  volume of new  extended  warranty  business.  This growth was  partially
offset by the run-off of auto credit business as planned.

In second  quarter  1997,  Aon reported  special  charges of $27 million  ($16.9
million  after-tax)  to  recognize  investment  losses  incurred at  Alexander &
Alexander  Services Inc.  (A&A ) before Aon acquired  A&A. At Aon's  acquisition
date, the carrying value of certain securities in A&A's portfolio was overstated
by the previously unrecognized investment losses.


                                     - 10 -
<PAGE>

In first  quarter  1997,  Aon reported  special  charges of $145 million  ($90.6
million after-tax) related to the restructuring of Aon's brokerage operations as
a result of the acquisition of A&A. The special  charges  included costs related
to severance and other costs and the  consolidation  of real estate  space.  The
1997 special charges were reflected as a separate component of total expenses in
the condensed consolidated statements of operations.

Total  expenses  increased  $110.8  million or 8.7% and $95.4 million or 3.7% in
second quarter and first half 1998,  respectively,  when compared to prior year.
The increase  reflects the inclusion of 1997 pretax  special  charges.  In first
half 1998,  restructuring  liabilities related to 1997 special charges have been
reduced as planned,  and reflect payments on those special charges and valuation
adjustments related to recent acquisitions.  Total expenses,  excluding the 1997
special  charges,  increased 11.1% and 11% for the second quarter and first half
1998, respectively. Income before income tax increased $87.7 million or 57.7% in
second quarter 1998  and  $310.3  million  or  185.7%  in  first  half 1998 when
compared  to prior year,  primarily  due to the inclusion of special  charges in
first half 1997.  Excluding  special charges, income before income tax increased
33.9% and 40.8% when compared to second quarter and first half 1997, largely due
to growth in  the  insurance   brokerage  and  consulting  services  segment and
to the achievement of cost savings resulting from the consolidation of brokerage
operations.


MAJOR LINES OF BUSINESS
- - - - - - - - - - - - - - - - - -----------------------

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

For purposes of the following line of business discussions,  comparisons against
last year's results exclude special  charges.  Management  anticipates  that the
full  benefit of cost  savings  on  brokerage  operations  will  continue  to be
achieved  throughout  the remainder of 1998.  In addition,  references to income
before income tax exclude minority interest related to the capital securities.


INSURANCE BROKERAGE AND CONSULTING SERVICES
- - - - - - - - - - - - - - - - - -------------------------------------------

First half 1998 revenue and income  before  income tax have been impacted by the
acquisitions  of Le Blanc and Gil y Carvajal in second and first  quarter  1998,
respectively,  and the acquisitions of Jauch & Hubener,  Minet and certain other
brokerage acquisitions in third and fourth quarter 1997.

Insurance and other  services  (retail,  reinsurance  and  wholesale  brokerage)
revenue  increased  $175  million  or 22.5% and  $313.5  million or 20.5% in the
second  quarter and first half 1998,  respectively,  when compared with the same
period  last year,  largely due to  acquisition  activity.  Insurance  and other
services continued to reflect highly competitive property and casualty pricing.

Consulting   provides  a  full  range  of  employee  benefits  and  compensation
consulting,   specialized   employee  assessment  and  training  programs,   and
administrative  services.  This business showed revenue growth of $11 million or
7.6% and $32  million  or 11.7% for the  second  quarter  and first  half  1998,
respectively,  when  compared to prior year,  primarily  due to second half 1997
acquisitions.  A decline in human resources  consulting revenue partially offset
growth in the quarter.

                                     - 11 -
<PAGE>

Overall,  revenue for the insurance  brokerage and consulting  services  segment
increased  $186  million  or 20.2% and  $345.5  million  or 19.2% in the  second
quarter and first half 1998, respectively.  Acquisitions made in 1998 and second
half 1997 accounted for a majority of the above mentioned  revenue growth in the
quarter. Excluding the impact of acquisitions, revenue related to brokerage core
businesses  grew  approximately  3% in the quarter and 4% in the first half in a
very competitive  environment.  Income before income tax increased $69.5 million
or 54.6% and $144.2  million or 61.1% when compared to second  quarter and first
half 1997,  respectively.  The brokerage  segment  continues to be impacted by a
soft property and casualty  market,  particularly in the  reinsurance  brokerage
business.  Pretax  margins in this segment  improved for the quarter  reflecting
cost savings resulting from the consolidation of businesses acquired in 1997.

U.S./INTERNATIONAL RESULTS
- - - - - - - - - - - - - - - - - --------------------------

Second quarter 1998 international  insurance  brokerage and consulting  services
revenue  represents 50% of the worldwide total and  international  income before
income  tax  represents  53% of the  worldwide  total.  International  brokerage
revenue of $554.3  million  increased  34.5% for the second  quarter,  primarily
reflecting  1998 and second  half  1997  acquisitions.  International  brokerage
income  before  income tax  increased  62.2% for the  second  quarter reflecting
the above mentioned  acquisition  activity. International brokerage revenues for
retail brokerage  services generally are  strongest  during the first quarter of
the year,  particularly  for continental  Europe, while expenses are incurred on
a more even basis throughout the year.

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

The insurance underwriting line of business primarily provides direct sales life
and accident and health products, and extended warranty products to individuals.
Revenue  increased $8.8 million or 1.9% and $38.4 million or 4.2% for the second
quarter  and  first  half  1998,  respectively,  when  compared  to prior  year,
primarily due to growth in the U.S.  electronic  and appliance  lines and in the
international  mechanical  extended  warranty  line.  Direct sales business also
continued to grow modestly.

Pretax income from insurance  underwriting decreased $1.4 million or 2% and $1.7
million or 1.3% in the second  quarter and first half 1998,  respectively,  when
compared  with last  year  reflecting  planned  start-up  costs in the  worksite
marketing  initiative,  and the run-off of auto credit  business  and  specialty
liability programs.  Overall, benefit and expense margins in second quarter 1998
did not suggest any significant  shift in operating  trends.  Extended  warranty
profits  improved  in the  quarter,  primarily  due to the  mechanical  extended
warranty line of business.

U.S./INTERNATIONAL RESULTS
- - - - - - - - - - - - - - - - - ---------------------------

Second quarter 1998 U.S.  insurance  underwriting  revenue represents 69% of the
worldwide  total  and  U.S.  income  before  income  tax  represents  71% of the
worldwide total. Second quarter U.S. insurance  underwriting  revenue and income
before income tax decreased 1.2% and 3%, respectively, when compared to the 1997
level.  Results  reflect the runoff of the auto credit  business  and  specialty
liability  programs.  International  insurance  underwriting  revenue  of $148.3
million  increased  9.6% in the  quarter  principally  due to growth in premiums
earned, primarily in the mechanical extended warranty line. International pretax
income increased modestly in the quarter.


                                     - 12 -
<PAGE>

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

Revenue in this  category  consists  primarily of investment  income  (including
realized  investment gains) on capital.  Insurance company  investment income is
allocated  to the  underwriting  segment  based  on the  invested  assets  which
underlie policyholder liabilities. Excess invested assets and related investment
income,  which do not underlie these liabilities,  are reported in this segment.
Expenses include interest and other financing  expenses,  goodwill  amortization
associated with insurance brokerage and consulting  acquisitions,  and corporate
administrative and information technology costs.

Revenue increased 13.3% or $3.7 million and 38.9% or $21.8 million in the second
quarter and first half 1998,  respectively,  primarily  due to higher  levels of
investment income received on private equity and other investment holdings.  The
loss before  income tax  increased  $7.4  million in the  quarter  over the same
period last year.  Contributing to the higher loss in the quarter were financing
costs and goodwill  amortization  related to acquisitions,  additional  interest
expense on short-term and long-term debt related to acquisition  financing,  and
costs related to investments in information technology.


                                     - 13 -
<PAGE>
<TABLE>
<CAPTION>
                                 Aon Corporation
                             MAJOR LINES OF BUSINESS


                                                         Second Quarter Ended               Six Months Ended
                                                  ------------------------------    -------------------------------
(millions except per share data)                   June 30,   June 30,   Percent     June 30,   June 30,   Percent
                                                     1998       1997     Change        1998       1997     Change 
                                                  ---------- ---------- --------    ---------- ----------  --------

REVENUE
- - - - - - - - - - - - - - - - - -------
Insurance brokerage and consulting services:
<S>                                               <C>        <C>             <C>    <C>        <C>              <C>  
    Insurance and other services ..............   $    953.8 $    778.8    22.5%    $  1,843.9 $  1,530.4     20.5%
    Consulting ................................        155.2      144.2     7.6          305.3      273.3     11.7
                                                  ---------- ---------- --------    ---------- ----------  --------
      TOTAL REVENUE ...........................      1,109.0      923.0    20.2        2,149.2    1,803.7     19.2
                                                  ---------- ---------- --------    ---------- ----------  --------

Insurance underwriting:
     Direct sales - life, accident and health .        261.2      259.7     0.6          518.9      514.4      0.9
     Extended warranty ........................        157.0      147.8     6.2          316.4      277.2     14.1
     Other ....................................         64.3       66.2    (2.9)         122.2      127.5     (4.2)
                                                  ---------- ---------- --------    ---------- ----------  --------
      TOTAL REVENUE ...........................        482.5      473.7     1.9          957.5      919.1      4.2
                                                  ---------- ---------- --------    ---------- ----------  --------
                                                                         
Corporate and other ...........................         31.5       27.8    13.3           77.8       56.0     38.9
                                                  ---------- ---------- --------    ---------- ----------  --------
      TOTAL REVENUE ...........................   $  1,623.0 $  1,424.5    13.9%    $  3,184.5 $  2,778.8     14.6%
                                                  ========== ========== ========    ========== ==========  ========


INCOME BEFORE INCOME TAX
- - - - - - - - - - - - - - - - - ------------------------
Insurance brokerage and consulting services ...   $    196.9 $    127.4    54.6%    $    380.2 $    236.0     61.1%
      Special charges .........................          --         --      --             --      (145.0)     --
                                                  ---------- ---------- ---------   ---------- ----------  --------
      Including special charges ...............        196.9      127.4    54.6          380.2       91.0    317.8


Insurance underwriting ........................         69.1       70.5    (2.0)         133.6      135.3     (1.3)


Corporate and other ...........................        (26.4)     (19.0)    N/A          (36.4)     (32.2)     N/A
      Special charges .........................          --       (27.0)    --             --       (27.0)     --
                                                  ---------- ----------  --------    ---------- ---------- --------
      Including special charges ...............        (26.4)     (46.0)    N/A          (36.4)     (59.2)     N/A

                                                  ---------- ----------  --------    ---------- ---------- --------
      TOTAL INCOME BEFORE INCOME TAX ..........   $    239.6 $    151.9    57.7%     $   477.4  $    167.1   185.7%
                                                  ========== ==========  ========    ========== ========== ========
</TABLE>


                                     - 14 -
<PAGE>
                NET INCOME FOR SECOND QUARTER AND FIRST HALF 1998


Second  quarter 1998 net income was $139.5  million  ($0.81  dilutive per share)
compared to $84.2 million  ($0.48  dilutive per share) in 1997.  First half 1998
net income was $277.8  million  ($1.61  dilutive  per share)  compared  to $84.9
million  ($0.46  dilutive  per  share) in 1997.  First  half 1997 net income was
primarily  influenced by after-tax 1997 special charges of $107.5 million ($0.64
per share) with no  comparable  amount in first half 1998.  Basic net income per
share was $0.82 and $0.48 in second  quarter  and $1.64 and $0.47 in first  half
1998 and 1997, respectively.

The effective tax rate was 37.5% for both 1998 and 1997. Dilutive average shares
outstanding  for  second  quarter  1998  increased  1.5% when  compared  to 1997
primarily  due to the  reissuance  of common  shares from  treasury for employee
benefits.

                        CASH FLOW AND FINANCIAL POSITION
                          AT THE END OF FIRST HALF 1998


Cash flows  provided  by  operating  activities  in first half 1998 were  $784.2
million,  an  increase  of $489.9  million  from first half 1997.  The  increase
represents  growth in the insurance  brokerage  businesses and the timing of the
settlement of brokerage receivables and payables.

Investing  activities  used cash of $1.1 billion which was made  available  from
financing and operating  activities.  Cash of $703 million was used during first
half 1998 for the purchase of short-term investments.  Cash used for acquisition
activity during first half 1998 was $263 million, primarily reflecting the Gil y
Carvajal and Le Blanc de Nicolay acquisitions.

Cash totaling  $250.4 million was provided during first half 1998 from financing
activities.  The decrease of $816.1  million from first half 1997 is primarily a
result  of the  1997  issuance  of  capital  securities.  Cash  was  used to pay
dividends  of $90.2  million  on common  stock and $1.3  million  on  redeemable
preferred stock.

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

Due to the contractual  nature of its insurance  policyholder  liabilities which
are  intermediate  to long-term in nature,  Aon has invested  primarily in fixed
maturities.  With a carrying  value of $3.1 billion,  Aon's total fixed maturity
portfolio is invested  primarily in investment  grade holdings (95.9%) and has a
fair value which is 104.2% of amortized cost.


                                     - 15 -
<PAGE>

Total  assets  increased  $1.2 billion to $19.8  billion  since  year-end  1997.
Invested assets at June 30, 1998 increased  $622.6 million from year-end levels,
primarily due to higher levels of short-term investments relating  to  brokerage
fiduciary funds . The amortized cost and  fair  value  of  less  than investment
grade fixed  maturity  investments,  at June 30, 1998,  were  $114.4 million and
$116.2  million,  respectively.  The  carrying  value  of  non-income  producing
investments  in Aon's  portfolio at June 30, 1998 was  $69.6 million, or 1.1% of
total invested assets.

Aon is continuing  to update its computer  systems in  preparation  for the Year
2000  and  expects  to  complete  its  efforts  by mid  1999.  Aon's  Year  2000
remediation  cost for all  lines of  business  is  expected  to be less than $50
million  through 1999 and is not expected to have a material  adverse  impact on
Aon's financial position or results of operations. Individual business units are
continuing to make the necessary changes to become compliant  according to their
plan and  their  progress  is being  monitored  by Aon's  Year  2000  compliance
coordinating  team.  If Aon's clients or vendors are unable to resolve Year 2000
compliance  issues in a timely manner,  a material  operating and financial risk
could result.

Aon uses derivative financial instruments  (primarily financial futures,  swaps,
options  and  foreign   exchange   forwards)  to:  (a)  hedge  foreign  currency
translation and transaction  risks and other business risks (i.e.  interest rate
and  credit  risk);  (b)  hedge  asset  price  risk  associated  with  financial
instruments whose change in value is reported under SFAS 115; and (c) manage its
overall  asset/liability  duration  match.  As of June  30,  1998,  Aon had open
contracts, related to the above, which had unrealized losses of approximately $1
million.

Insurance brokerage and consulting services receivables increased $243.7 million
when compared to year-end 1997.  Insurance  premiums  payable  increased  $561.3
million in first half 1998, reflecting  acquisitions and the  receipt of  client
fiduciary funds.

Short-term  borrowings  increased  at the end of first half 1998 by $167 million
when compared to year-end  1997.  The increase is primarily due to the financing
of acquisitions.  Notes payable decreased at the end of first half 1998 by $12.6
million when  compared to year-end  1997.  Included in notes payable at June 30,
1998 is approximately $55 million which represents the principal amount of notes
due within one year.

Stockholders'  equity  increased  $203  million in first half 1998 to $17.91 per
share,  an  increase  of $1.11 per share  since  year-end  1997.  This  increase
consisted of net income partially offset by net unrealized  investment losses of
$12.4 million and dividends to common stockholders of $90.2 million.


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

The condensed  consolidated  financial  statements at June 30, 1998, and for the
second quarter and first half then ended have been reviewed, prior to filing, by
Ernst & Young LLP,  Aon's  independent  auditors,  and their  report is included
herein.


                                     - 16 -
<PAGE>
INDEPENDENT ACCOUNTANTS' REVIEW REPORT



Board of Directors and Stockholders
Aon Corporation

We have reviewed the accompanying  condensed consolidated statement of financial
position of Aon  Corporation  as of June 30,  1998,  and the  related  condensed
consolidated  statements of operations for the three-month and six-month periods
ended June 30, 1998 and 1997, and the condensed consolidated  statements of cash
flows for the six-month  periods ended June 30, 1998 and 1997.  These  financial
statements are the responsibility of the Company's management.

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

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

We have  previously  audited,  in accordance  with generally  accepted  auditing
standards,  the consolidated  statement of financial position of Aon Corporation
as of December  31, 1997,  and the related  consolidated  statements  of income,
stockholders'  equity,  and cash flows for the year then  ended,  not  presented
herein,  and in our report dated  February 10, 1998, we expressed an unqualified
opinion  on  those  consolidated  financial  statements.  In  our  opinion,  the
information set forth in the accompanying  condensed  consolidated  statement of
financial  position as of December 31, 1997, is fairly  stated,  in all material
respects,  in relation to the consolidated  statement of financial position from
which it has been derived.



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

Chicago, Illinois
August 5, 1998


                                     - 17 -
<PAGE>

                                     PART II
                                     -------

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


ITEM 6.     EXHIBITS AND REPORTS ON FORM 8-K

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

      (b)   Reports on Form 8-K - No Current  Reports on Form 8-K were filed for
            -------------------
            the quarter ended June 30, 1998.


                                    SIGNATURE

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

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

August 14, 1998                     /s/ Harvey N. Medvin
                                    --------------------
                                    HARVEY N. MEDVIN
                                    EXECUTIVE VICE PRESIDENT AND
                                    CHIEF FINANCIAL OFFICER 
                                    (Principal Financial and Accounting Officer)


                                     - 18 -
<PAGE>
                                 Aon CORPORATION
                                 ---------------

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



Exhibit Number
In Regulation S-K

Item 601 Exhibit Table
- - - - - - - - - - - - - - - - - ----------------------


(12) Statements regarding Computation of Ratios.

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

(15) Letter re: Unaudited Interim Financial Information

(27) Financial Data Schedule


                                     - 19 -
<PAGE>

<TABLE>
<CAPTION>
                                                                                                    Exhibit 12(a)

                        Aon CORPORATION AND CONSOLIDATED SUBSIDIARIES
                          COMBINED WITH UNCONSOLIDATED SUBSIDIARIES
                      COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES


                                                    Six Months
                                                  Ended June 30,                 Years Ended December 31,
                                               --------  --------  --------  --------  --------  --------  --------
 (millions except ratios)                        1998      1997      1997      1996      1995      1994      1993
                                               --------  --------  --------  --------  --------  --------  --------

Income from continuing operations
<S>                                            <C>       <C>       <C>       <C>       <C>       <C>       <C>     
   before provision for income taxes (1)       $  477.4  $  167.1  $  541.6  $  445.6  $  458.0  $  397.0  $  331.6

ADD BACK FIXED CHARGES:

   Interest on indebtedness                        41.3      30.6      69.5      44.7      55.5      46.4      42.3

   Interest on ESOP                                 1.4       1.9       3.5       4.3       5.3       5.9       6.5

   Portion of rents representative of
     interest factor                               22.2      29.4      44.3      28.6      21.4      28.7      26.1

                                               --------  --------  --------  --------  --------  --------  --------
        INCOME AS ADJUSTED                     $  542.3  $  229.0  $  658.9  $  523.2  $  540.2  $  478.0  $  406.5
                                               ========  ========  ========  ========  ========  ========  ========


FIXED CHARGES:

   Interest on indebtedness                    $   41.3  $   30.6  $   69.5  $   44.7  $   55.5  $   46.4  $   42.3

   Interest on ESOP                                 1.4       1.9       3.5       4.3       5.3       5.9       6.5

   Portion of rents representative of
      interest factor                              22.2      29.4      44.3      28.6      21.4      28.7      26.1

                                               --------  --------  --------  --------  --------  --------  --------
        TOTAL FIXED CHARGES                    $   64.9  $   61.9  $  117.3  $   77.6  $   82.2  $   81.0  $   74.9
                                               ========  ========  ========  ========  ========  ========  ========

RATIO OF EARNINGS TO FIXED CHARGES                  8.4       3.7       5.6       6.7       6.6       5.9       5.4
                                               ========  ========  ========  ========  ========  ========  ========

RATIO OF EARNINGS TO FIXED CHARGES (2)                        6.5       7.1       7.9
                                                         ========  ========  ========


<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes  special  charges of $172 million for the six
      months ended June 30, 1997 and the year ended December 31, 1997, and $90.5
      million in the year ended December 31, 1996.

(2)   The  calculation  of this ratio of earnings to fixed charges  reflects the
      exclusion of special  charges from the income from  continuing  operations
      before  provision for income taxes component for six months ended June 30,
      1997 and for the years ended December 31, 1997 and 1996, respectively.
</FN>
</TABLE>


                                     
<PAGE>

<TABLE>
<CAPTION>
                                                                                                            Exhibit 12(b)

                        Aon CORPORATION AND CONSOLIDATED SUBSIDIARIES
                          COMBINED WITH UNCONSOLIDATED SUBSIDIARIES
                  COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                                AND PREFERRED STOCK DIVIDENDS


                                                           Six Months
                                                         Ended June 30,                 Years Ended December 31,
                                                      --------  --------  --------  --------  --------  --------  --------
(millions except ratios)                                1998      1997      1997      1996      1995      1994      1993
                                                      --------  --------  --------  --------  --------  --------  --------

Income from continuing operations
<S>                                                   <C>       <C>       <C>       <C>       <C>       <C>       <C>     
   before provision for income taxes (1)              $  477.4  $  167.1  $  541.6  $  445.6  $  458.0  $  397.0  $  331.6


ADD BACK FIXED CHARGES:

   Interest on indebtedness                               41.3      30.6      69.5      44.7      55.5      46.4      42.3

   Interest on ESOP                                        1.4       1.9       3.5       4.3       5.3       5.9       6.5

   Portion of rents representative of
     interest factor                                      22.2      29.4      44.3      28.6      21.4      28.7      26.1

                                                      --------  --------  --------  --------  --------  --------  --------
        INCOME AS ADJUSTED                            $  542.3  $  229.0  $  658.9  $  523.2  $  540.2  $  478.0  $  406.5
                                                      ========  ========  ========  ========  ========  ========  ========


FIXED CHARGES AND PREFERRED STOCK DIVIDENDS:

   Interest on indebtedness                           $   41.3   $  30.6  $   69.5  $   44.7  $   55.5   $  46.4   $  42.3

   Preferred stock dividends                              35.0      42.0      82.1      28.7      37.5      48.4      47.5

                                                      --------  --------  --------  --------  --------  --------  --------
        INTEREST AND DIVIDENDS                            76.3      72.6     151.6      73.4      93.0      94.8      89.8

   Interest on ESOP                                        1.4       1.9       3.5       4.3       5.3       5.9       6.5

   Portion of rents representative of
      interest factor                                     22.2      29.4      44.3      28.6      21.4      28.7      26.1

        TOTAL FIXED CHARGES AND PREFERRED
                                                      --------  --------  --------  --------  --------  --------  --------
            STOCK DIVIDENDS                           $   99.9  $  103.9  $  199.4  $  106.3  $  119.7  $  129.4  $  122.4
                                                      ========  ========  ========  ========  ========  ========  ========

RATIO OF EARNINGS TO COMBINED FIXED
  CHARGES AND PREFERRED STOCK DIVIDENDS (2)                5.4       2.2       3.3       4.9       4.5       3.7       3.3
                                                      ========  ========  ========  ========  ========  ========  ========

RATIO OF EARNINGS TO COMBINED FIXED
  CHARGES AND PREFERRED STOCK DIVIDENDS (3)                          3.9       4.2       5.8
                                                                ========  ========  ======== 
   
<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes  special  charges of $172 million for the six
      months ended June 30, 1997 and the year ended December 31, 1997, and $90.5
      million in the year ended December 31, 1996.

(2)   Included in total fixed charges and preferred  stock dividends for the six
      months  ended June 30, 1998 and 1997 are $33  million  and $31.2  million,
      respectively,  and $64  million  for the year ended  December  31, 1997 of
      pretax  distributions  on  the  8.205%  mandatorily  redeemable  preferred
      capital  securities  which are  classified  as "minority  interest" on the
      condensed consolidated statements of operations.

(3)   The  calculation  of this ratio of earnings to fixed charges  reflects the
      exclusion of special  charges from the income from  continuing  operations
      before  provision for income taxes component for six months ended June 30,
      1997 and for the years ended December 31, 1997 and 1996, respectively.
</FN>
</TABLE>


                                     
<PAGE>


                                                                      Exhibit 15




Board of Directors and Stockholders
Aon Corporation


We are aware of the incorporation by reference in the Registration Statements of
Aon  Corporation  ("Aon")  described in the following  table of our report dated
August  5,  1998  relating  to  the  unaudited  condensed  consolidated  interim
financial  statements of Aon Corporation  that are included in its Form 10-Q for
the quarter ended June 30, 1998:

    Registration Statement
    ----------------------
      Form      Number                    Purpose
      ----      ------                    -------

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

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


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



Chicago, Illinois
August 5, 1998


                                     
<PAGE>

<TABLE> <S> <C>

<ARTICLE>                                 5
<LEGEND>
      This  schedule  contains  summary  financial  information  extracted  from
      Condensed  Consolidated  Statements  of Financial  Position and  Condensed
      Consolidated  Statements  of Income and is  qualified  in its  entirety by
      reference to such financial statements.
</LEGEND>
<MULTIPLIER>                      1,000,000
<CURRENCY>                              USD
       
<S>                             <C>
<PERIOD-TYPE>                         6-MOS
<FISCAL-YEAR-END>               DEC-31-1998
<PERIOD-START>                  JAN-01-1998
<PERIOD-END>                    JUN-30-1998
<EXCHANGE-RATE>                         1.0
<CASH>                                3,398<F1>
<SECURITIES>                          3,877<F2>
<RECEIVABLES>                         6,818
<ALLOWANCES>                             84
<INVENTORY>                               0
<CURRENT-ASSETS>                          0<F3>
<PP&E>                                1,243
<DEPRECIATION>                          705
<TOTAL-ASSETS>                       19,845
<CURRENT-LIABILITIES>                     0<F3>
<BONDS>                                 625<F4>
                   850<F5>
                               0
<COMMON>                                172
<OTHER-SE>                            2,853
<TOTAL-LIABILITY-AND-EQUITY>         19,845
<SALES>                                   0
<TOTAL-REVENUES>                      3,185
<CGS>                                     0
<TOTAL-COSTS>                             0
<OTHER-EXPENSES>                      2,707<F6>
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                       41
<INCOME-PRETAX>                         477
<INCOME-TAX>                            179
<INCOME-CONTINUING>                     298
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                            278
<EPS-PRIMARY>                          1.64
<EPS-DILUTED>                          1.61
        

<FN>
<F1>  Includes short-term investments.
<F2>  Includes fixed maturities and equity securities at fair value.
<F3>  Not applicable based on current reporting format.
<F4>  Includes notes payable.
<F5>  Preferred stock at par value. Includes Company-obligated Mandatorily
      Redeemable  Preferred Capital   Securities  of  Subsidiary  Trust
      holding solely to Company's Junior Subordinated Debentures.
<F6>  Represents total expenses.
</FN>

</TABLE>


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