AON CORP
10-Q, 1999-08-16
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, 1999

                                       OR

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

                          Commission file number 1-7933

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

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



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

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


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

Number of shares of common stock outstanding:

                                                           No. Outstanding
                    Class                                   as of 6-30-99
                    -----                                   -------------

           $1.00 par value Common                            256,165,977
 (Adjusted to reflect a three-for-two stock split
   paid on May 17, 1999 to stockholders of
            record on May 4, 1999)

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

(millions)                      AS OF JUNE    AS OF DEC.                                                  AS OF JUNE   AS OF DEC.
                                 30, 1999      31, 1998                                                    30, 1999     31, 1998
                                ------------------------                                                  -----------------------
<S>                               <C>         <C>                                                             <C>         <C>
                                (UNAUDITED)                                                               (UNAUDITED)

 ASSETS                                                    LIABILITIES AND STOCKHOLDERS' EQUITY

 INVESTMENTS                                               INSURANCE PREMIUMS PAYABLE                      $  7,640    $  6,948

  Fixed maturities at fair value   $ 2,954     $ 3,103     POLICY LIABILITIES
                                                            Future policy benefits                            1,002         986
  Equity securities at fair value      684         768      Policy and contract claims                          780         779
                                                            Unearned and advance premiums                     1,925       1,797
  Short-term investments             2,201       2,221      Other policyholder funds                          1,378       1,261
                                                                                                          ----------  ----------
  Other investments                    519         360         TOTAL POLICY LIABILITIES                       5,085       4,823

                                  ---------  ----------    GENERAL LIABILITIES
      TOTAL INVESTMENTS              6,358       6,452      General expenses                                  1,086       1,259
                                                            Short-term borrowings                               926         844
                                                            Notes payable                                       814         580
 CASH                                1,038         723      Other liabilities                                 1,485       1,367
                                                                                                          ----------  ----------
                                                               TOTAL LIABILITIES                             17,036      15,821
 RECEIVABLES

  Insurance brokerage and                                  COMMITMENTS AND CONTINGENT LIABILITIES
      consulting services            6,119       5,423
                                                           REDEEMABLE PREFERRED STOCK                            50          50

  Premiums and other                 1,133       1,120     COMPANY-OBLIGATED MANDATORILY REDEEMABLE
                                                            PREFERRED CAPITAL SECURITIES OF SUBSIDIARY
                                                            TRUST HOLDING SOLELY THE COMPANY'S JUNIOR
  Accrued investment income             67          63      SUBORDINATED DEBENTURES                             800         800

                                  ---------  ----------
       TOTAL RECEIVABLES             7,319       6,606     STOCKHOLDERS' EQUITY
                                                            Common stock - $1 par value                         258         172
                                                            Paid-in additional capital                          484         450
 INTANGIBLE ASSETS                   3,642       3,500      Accumulated other comprehensive loss               (196)       (116)
                                                            Retained earnings                                 2,871       2,782
                                                            Less - Treasury stock at cost                       (61)        (58)
 OTHER ASSETS                        2,647       2,407             Deferred compensation                       (238)       (213)
                                                                                                          ----------  ----------
                                                              TOTAL STOCKHOLDERS' EQUITY                      3,118       3,017

                                 ----------  ----------                                                   ----------  ----------
       TOTAL ASSETS               $ 21,004    $ 19,688        TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY   $ 21,004    $ 19,688
                                 ==========  ==========                                                   ==========  ==========

</TABLE>

See the accompanying notes to the condensed consolidated financial statements.

                                      - 2 -
<PAGE>
<TABLE>
<CAPTION>
                                                    Aon CORPORATION
                                     CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                                       (UNAUDITED)

                                                                    SECOND QUARTER ENDED          SIX MONTHS ENDED
                                                                  -------------------------  -------------------------
 (millions except per share data)                                    JUNE 30,     JUNE 30,     JUNE 30,      JUNE 30,
                                                                       1999         1998         1999          1998
                                                                  ------------ ------------  ------------ ------------
<S>                                                                   <C>          <C>           <C>          <C>
 REVENUE
    Brokerage commissions and fees                                    $ 1,143      $ 1,060       $ 2,255      $ 2,056
    Premiums and other                                                    441          423           878          840
    Investment income                                                     139          140           289          288
                                                                  ------------ ------------  ------------ ------------
       TOTAL REVENUE                                                    1,723        1,623         3,422        3,184
                                                                  ------------ ------------  ------------ ------------

 EXPENSES
    General expenses                                                    1,167        1,104         2,476        2,152
    Benefits to policyholders                                             237          227           476          453
    Interest expense                                                       24           21            45           41
    Amortization of intangible assets                                      35           31            69           61
                                                                  ------------ ------------  ------------ ------------
       TOTAL EXPENSES                                                   1,463        1,383         3,066        2,707
                                                                  ------------ ------------  ------------ ------------

 INCOME BEFORE INCOME TAX AND MINORITY INTEREST                           260          240           356          477
    Provision for income tax                                               99           90           135          179
                                                                  ------------ ------------  ------------ ------------
 INCOME BEFORE MINORITY INTEREST                                          161          150           221          298
    Minority interest - 8.205% trust preferred capital securities         (10)         (10)          (20)         (20)
                                                                  ------------ ------------  ------------ ------------
 NET INCOME                                                           $   151      $   140       $   201      $   278
                                                                  ============ ============  ============ ============
    Preferred stock dividends                                              (1)          (1)           (1)          (1)
                                                                  ------------ ------------  ------------ ------------
 NET INCOME AVAILABLE FOR COMMON STOCKHOLDERS                         $   150      $   139       $   200      $   277
                                                                  ============ ============  ============ ============

 NET INCOME PER SHARE (1):
    Basic net income per share                                        $  0.58      $  0.55       $  0.77      $  1.09
                                                                  ============ ============  ============ ============
    Dilutive net income per share                                     $  0.57      $  0.54       $  0.76      $  1.07
                                                                  ============ ============  ============ ============

 CASH DIVIDENDS PAID ON COMMON STOCK (1)                              $  0.21      $  0.19       $  0.40      $  0.36
                                                                  ============ ============  ============ ============

 Dilutive average common and common equivalent
      shares outstanding (1)                                            263.7        258.3         262.9        257.6
                                                                  ------------ ------------  ------------ ------------

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

See the accompanying notes to the condensed consolidated financial statements.

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


                                                                    Six Months Ended
                                                             ------------------------------
                                                                 June 30,        June 30,
 (millions)                                                        1999            1998
                                                             --------------  --------------

<S>                                                                    <C>           <C>
 Cash Provided by Operating Activities                          $      357      $      784

 Cash Flows from Investing Activities:
   Sale of investments
       Fixed maturities
           Maturities                                                   30              59
           Calls and prepayments                                       104              36
           Sales                                                       788           1,749
       Equity securities                                               356           1,481
       Other investments                                                38              27
   Purchase of investments
       Fixed maturities                                               (848)         (1,776)
       Equity securities                                              (384)         (1,486)
       Other investments                                               (87)           (109)
  Purchase of short-term investments - net                             (49)           (703)
  Acquisition of subsidiaries                                         (177)           (263)
  Property and equipment and other                                    (134)           (105)
                                                               ------------    ------------
           Cash Used by Investing Activities                          (363)         (1,090)
                                                               ------------    ------------

 Cash Flows from Financing Activities:
    Treasury stock transactions - net                                  (13)             15
    Issuance of short-term borrowings - net                            126             167
    Issuance (repayment) of long-term debt                             252             (13)
    Interest sensitive life, annuity and investment contracts
       Deposits                                                        153             221
       Withdrawals                                                     (91)            (48)
    Cash dividends to stockholders                                    (101)            (92)
                                                               ------------    ------------
           Cash Provided by Financing Activities                       326             250
                                                               ------------    ------------

 Effect of Exchange Rate Changes on Cash                                (5)              5
 Increase (Decrease) in Cash                                           315             (51)
 Cash at Beginning of Period                                           723           1,085
                                                               ------------    ------------
 Cash at End of Period                                          $    1,038      $    1,034
                                                               ============    ============
</TABLE>

See the accompanying notes to condensed consolidated financial statements.

                                      - 4 -
<PAGE>

NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS


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

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

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

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


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

      On March 19,  1999,  Aon's board of directors  authorized a  three-for-two
      stock split of Aon's $1.00 par value common stock,  with  approximately 86
      million  shares  payable  on May 17,  1999.  The stock  split has not been
      retroactively  reflected in the December 31, 1998  condensed  consolidated
      statement  of  financial  position.  The effect of the stock  split was to
      increase  common  stock and  decrease  additional  paid-in-capital  by $86
      million.  All references in the accompanying  financial  statements to the
      number of common  shares  and per share  amounts  have been  retroactively
      restated to reflect the stock split.


3     Statements of  Financial Accounting Standards (SFAS)
      ----------------------------------------------------

      Derivatives Disclosure
      ----------------------
      In June 1998,  the Financial  Accounting  Standards  Board (FASB) issued
      Statement No. 133  (Accounting  for Derivative  Instruments  and Hedging
      Activities).  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.

      In June  1999,  the  FASB  issued  Statement  No. 137  that  amends  the
      required  adoption date of Statement  No. 133 to all fiscal  quarters of
      all fiscal  years  beginning  after June 15,  2000.  Early  adoption  is
      permitted as of the beginning of any quarter  subsequent to the issuance
      of  Statement  No.  137.  Aon  has not yet  decided  when it will  adopt
      Statement No. 133.


                                      - 5 -
<PAGE>

4.    Comprehensive Income
      --------------------

      The components of comprehensive income, net of related tax, for the second
      quarter and six months ended June 30, 1999 and 1998 are as follows:

<TABLE>
<CAPTION>
      (millions)                        Second Quarter Ended                       Six Months Ended
                                        --------------------                       ----------------
                                     June 30, 1999  June 30, 1998          June 30, 1999   June 30, 1998
                                     -------------  -------------          -------------   -------------

<S>                                  <C>            <C>                    <C>             <C>
Net income                           $      151     $      140             $      201      $      278
Net unrealized investment losses            (37)            (6)                  (100)            (12)
Net foreign exchange gains (losses)          21             (8)                   (45)             (6)
Net additional minimum pension
  liability reduction                        65              -                     65               -
                                     -----------    -----------            -----------     -----------
Comprehensive income                 $      200     $      126             $      121      $      260
                                     ===========    ===========            ===========     ===========
</TABLE>



      The components of  accumulated  other  comprehensive  loss, net of related
      tax, at June 30, 1999 and December 31, 1998, are as follows:

<TABLE>
<CAPTION>
                                                       June 30,        December 31,
(millions)                                               1999              1998
                                                    ---------------   --------------
<S>                                                 <C>               <C>
Net unrealized investment gains (losses)            $         (22)    $         78
Net foreign exchange losses                                  (143)             (98)
Net additional minimum pension liability                      (31)             (96)
                                                    ---------------   --------------
Accumulated other comprehensive loss                $        (196)    $       (116)
                                                    ===============   ==============
</TABLE>

5.    Business Segments
      -----------------

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

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

      In accordance with the interim period reporting  requirements of Statement
      No. 131, the segment information located in the tables on pages 12 through
      15 is incorporated herein by reference.

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

                                      - 6 -
<PAGE>

6.    Notes Payable
      -------------

      In second quarter 1999, Aon filed a universal  shelf  registration on Form
      S-3 with the Securities  and Exchange  Commission for the issuance of $500
      million of debt and equity  securities.  In a public offering based on the
      shelf  registration,  Aon issued $250 million of 6.9% debt  securities due
      June,  2004. The net proceeds from the sale of the 6.9% notes were used to
      reduce outstanding short-term commercial paper borrowings.


7.    Capital Stock
      -------------

      During six months 1999,  Aon  reissued 1.3 million  shares of common stock
      from treasury for employee  benefit plans and 333,600 shares in connection
      with the employee stock purchase plan. Aon purchased 1.2 million shares of
      its common stock at a total cost of $49.1 million  during six months 1999.
      There were 1.8 million shares of common stock held in treasury at June 30,
      1999.


8.    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.


9.    Special Charges
      ---------------

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

      Total  severance and related  pension  expenses,  involving 900 positions,
      were $99 million. Of the $99 million, approximately $32 million represents
      benefits  related to pension  plans and is included in Aon's total pension
      liability.   Workforce   reductions  are  related  to  a  voluntary  early
      retirement  plan  for  employees  of Aon's  U.S.  and  Canadian  operating
      subsidiaries,  as well as the  consolidation  of Aon's European  insurance
      brokerage and other services operations,  primarily in the United Kingdom.
      As of June 30,  1999,  approximately  $40 million has been paid related to
      the termination of approximately 800 employees.  The remaining payments on
      these  terminations and the remaining  terminations plan to be paid by the
      first quarter 2000.

      In the consulting  segment,  special charges of approximately  $43 million
      were  recorded in first quarter 1999 to reflect  amounts  required to make
      redress  payments to customers who purchased  private pension plans in the
      United Kingdom several years ago. These amounts are anticipated to be paid
      primarily by early 2001. Aon's ultimate  exposure from the private pension
      plan review, as presently  calculated,  is subject to a number of variable
      factors including,  among others,  equity markets, the rate of response to
      the pension review mailings,  the interest rate  established  quarterly by
      the U.K. Pension Investment  Authority for calculating  compensation,  and
      the precise scope, duration, and methodology of the review.

                                      - 7 -
<PAGE>

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


10.   Income Per Share
      ----------------

      Income per share is computed as follows:
<TABLE>
<CAPTION>

==========================================================================================
(millions except per               Second Quarter Ended            Six Months Ended
 share data)                       --------------------            ----------------
                              June 30, 1999  June 30, 1998   June 30, 1999  June 30, 1998
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------

<S>                                 <C>            <C>            <C>            <C>
Net income                          $ 151          $ 140          $ 201          $ 278
Redeemable preferred stock
  dividends                             1              1              1              1
                                    -----          -----          -----          -----
Net income for dilutive
  and basic                         $ 150          $ 139          $ 200          $ 277
                                    =====          =====          =====          =====

Basic shares outstanding              260            254            259            254
Common stock equivalents                4              4              4              4
                                    -----          -----          -----          -----
Dilutive potential common
  shares                              264            258            263            258
==========================================================================================
Basic net income per share          $0.58          $0.55          $0.77          $1.09
Dilutive net income per share       $0.57          $0.54          $0.76          $1.07
==========================================================================================
</TABLE>


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

      A&A  discontinued its insurance  underwriting  operations in 1985, some of
      which were then placed into run-off,  with the remainder  sold in 1987. In
      connection with those sales, A&A provided indemnities to the purchaser for
      various estimated and potential liabilities, including provisions to cover
      future losses attributable to insurance pooling arrangements,  a stop-loss
      reinsurance  agreement,  and actions or omissions by various  underwriting
      agencies previously managed by an A&A subsidiary. As of June 30, 1999, the
      liabilities  associated with the foregoing  indemnities and liabilities of
      insurance  underwriting  subsidiaries  that are  currently in run-off were
      included in other liabilities in the accompanying  condensed  consolidated
      statement of financial  position.  Such liabilities are net of reinsurance
      recoverables and other assets.


12.   Contingencies
      -------------

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

                                     - 8 -
<PAGE>

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


      In the second  quarter of 1999,  Allianz Life  Insurance  Company of North
      America, Inc. ("Allianz") filed an amended complaint in Minnesota adding a
      brokerage  subsidiary of Aon as a defendant in an action which Allianz had
      originally  brought  against  three  insurance  carriers  to all of  which
      Allianz  had issued  reinsurance  cover.  These three  carriers,  together
      referred  to  as  the  "APS  Insurers,"  are  American  Phoenix  Life  and
      Reassurance  Company,  Phoenix Home Life Mutual Insurance  Company and Sun
      Life  Assurance   Company  of  Canada.   APS  Insurers   provided  certain
      reinsurance  to a pool of  insurers  and to certain  facilities.  Unicover
      Managers,  Inc.  ("Unicover"),  a New Jersey corporation unrelated to Aon,
      managed  the pool and  facilities,  which  issued  reinsurance  related to
      certain workers' compensation  insurance coverages.  In turn, APS Insurers
      obtained  reinsurance from carriers,  including  Allianz.  Allianz alleges
      that Centaur  Underwriting  Management Ltd.  ("Centaur"),  a Bermuda-based
      entity  unrelated to Aon, is a managing  general  underwriter  that at all
      material  times held  underwriting  authority  for, and was an  authorized
      agent of, the APS  Insurers,  but has not named  Centaur  as a  defendant.
      Allianz claims that the  reinsurance it issued should be rescinded or that
      it should be awarded damages,  based on alleged fraudulent,  negligent and
      innocent   misrepresentations  by  APS  Insurers,  through  their  alleged
      authorized agents, Centaur and the Aon subsidiary defendant.  Aon believes
      that the Aon  subsidiary has  meritorious  defenses and the Aon subsidiary
      intends to  vigorously  defend  this claim.  While the Allianz  lawsuit is
      among several lawsuits and arbitrations  that have been started by various
      persons that relate directly or indirectly to one or more entities managed
      by  Unicover,  the  Allianz  lawsuit is the only  lawsuit  or  arbitration
      relating  to  Unicover  in which any Aon  related  entity is involved as a
      party.

      Although the ultimate  outcome of all matters  referred to above 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 matters
      will not have a  material  adverse  effect on the  consolidated  financial
      position of Aon.


13.   Subsequent Event
      ----------------

      In July 1999, Aon acquired Nikols  Sedgwick,  a leading Italian  insurance
      and reinsurance  broker.  This  acquisition was financed by internal funds
      and will be accounted for by the purchase method. The effect of the Nikols
      Sedgwick   acquisition  is  not   anticipated  to  be  material  to  Aon's
      consolidated financial statements.

                                      - 9 -
<PAGE>

                                 Aon CORPORATION
                  MANAGEMENT'S ANALYSIS OF OPERATING RESULTS
                           AND FINANCIAL CONDITION

                     REVENUE AND INCOME BEFORE INCOME TAX
                    FOR SECOND QUARTER AND SIX MONTHS 1999



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

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

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

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

Special  charges  information  located in note 9 to the  condensed  consolidated
financial statements is incorporated herein by reference.

Brokerage  commissions  and fees  increased $83 million or 8% in second  quarter
1999 and $199 million or 10% in six months 1999, reflecting  post-second quarter
1998 business combination activity and internal growth.

Premiums and other is primarily  related to insurance  underwriting  operations.
Premiums and other  increased  $18 million or 4% in second  quarter 1999 and $38
million or 5% in six months  1999,  compared  with the same  periods  last year.
Extended  warranty  premiums  earned  increased $8 million or 6% in the quarter,
primarily  reflecting continued growth in the appliance and electronics warranty
lines.  Direct sales premiums earned  increased $14 million or 6% reflecting the
introduction  of  several  new  products,  growth  in  worksite  marketing,  and
geographic  expansion.  The  runoff  of  North  American  auto  credit  business
partially offset this growth in premiums earned.

Investment  income  includes income on disposals and related  expenses.  For the
quarter,  investment  income is down $1 million or 1%  compared  to prior  year,
primarily  due to short-term  interest  rates.  Included in second  quarter 1999
investment  income is an $8.5 million  settlement of a dispute with an unrelated
third party. For six months 1999, investment income is up $1 million compared to
1998. The primary factors causing this

                                     - 10 -
<PAGE>

change  are  short-term  interest  rate  decline,  the  dispute  settlement, and
approximately  $30  million  gain  on  disposal  of  tax-exempt  bonds  in first
quarter 1999.  Investment  income  from  insurance brokerage and other services,
primarily  relating to fiduciary  funds, decreased $11 million in second quarter
1999 compared to prior year.  Consulting operations  investment  income declined
$1 million in the  quarter compared to  prior  year.  A reduction  in short-term
interest  rates  contributed  to the overall  investment  income  decline in the
brokerage segments.

Total  revenue  increased  $100  million or 6% in second  quarter  1999 and $238
million or 7% in six months  1999,  attributable  to  post-second  quarter  1998
brokerage acquisition activity and internal  growth in the  operating  segments.

Benefits to policyholders increased $10 million or 4% in second quarter 1999 and
$23 million or 5% in six months 1999. The increase in the quarter and six months
was consistent  with growth in related  premiums earned and reflected no unusual
claims activity. The run-off of auto credit business as planned partially offset
the increase in policyholder benefits.

Total expenses increased $80 million or 6% in second quarter and $359 million or
13% in six months 1999 when compared to prior year. The six months 1999 increase
reflects the  inclusion of first  quarter  1999 pretax  special  charges of $163
million.  Total expenses,  excluding the 1999 special charges,  increased 7% for
the six months  when  compared  to 1998.  Second  quarter  and six  months  1999
expenses  increased over prior year primarily due to investments in new business
initiatives,  technology and product development.  Restructuring liabilities for
recent  acquisitions  and 1999 special  charges have been reduced by payments as
planned.  Due  to  the  early  retirement  program  in  first  quarter  1999 and
significant  changes  in  interest rates,  Aon  revalued  its  domestic and U.K.
pension plans as of April 1, 1999.  The revaluation  resulted  in a reduction of
pension expense, the effect of which  was  reflected in  second  quarter and six
months 1999 general expenses.

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

Income before income tax increased $20 million or 8% in second quarter 1999. Six
months 1999 income before income tax decreased $121 million or 25% when compared
to prior year,  primarily  due to the  inclusion of special  charges.  Excluding
special  charges,  income  before  income tax increased $42 million or 9% in six
months 1999 when compared to prior year,  reflecting  internal growth in each of
the  operating  business  segments,  in  addition  to  the  impact  of  business
combination  activity in 1999 and 1998 in the insurance  and other  services and
consulting  segments.   Total  annualized  cost  savings  are  projected  to  be
approximately $50 million related to first quarter 1999 restructuring activity.


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

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

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

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

                                     - 11 -
<PAGE>

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

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

Second quarter 1999 Insurance Brokerage and Other Services revenue increased $66
million  or 7% and  six  months  1999  revenue  increased  $173  million  or 9%.
Post-second  quarter 1998  acquisitions as well as internal growth accounted for
the  majority  of  revenue  growth.   Excluding  the  impact  of   acquisitions,
commissions and fee revenue for brokerage core businesses grew  approximately 4%
in the quarter and 5% in six months in a very competitive  environment.  Revenue
earned related to reinsurance obtained by Unicover pool members (see Footnote 12
- - - - - - - - - - - - - - - - - -  Contingencies)  was $9 million for six months 1999.  Revenue  earned for full
year 1998 was $15 million and is anticipated to be approximately $28 million for
full year 1999.

<TABLE>
<CAPTION>
========================================================================================
Insurance Brokerage and Other Services
(millions)                     Second quarter ended June 30,   Six months ended June 30,
                                     1999          1998          1999          1998
========================================================================================

<S>                               <C>             <C>           <C>            <C>
Revenue:
   United States                  $      537      $     455     $    1,020     $     867
   United Kingdom                        218            221            407           406
   Europe                                143            154            368           331
   Rest of World                         122            124            222           240
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Total Revenue                     $    1,020      $     954     $    2,017     $   1,844
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------

Income before income tax
   excluding special charges      $      188      $     182     $      372     $     350
Special charges                            -              -           (119)            -
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Income before income tax          $      188      $     182     $      253     $     350
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
</TABLE>


U.S.  revenue of $537 million in second quarter 1999 was up 18% from 1998. Total
international  revenues in the quarter  declined $16 million or 3% when compared
to prior year, primarily reflecting the impact of foreign exchange rates, and to
a lesser extent, a reduction in short-term interest rates.

U.S.  revenue of $1 billion in six months 1999 was up  18%  from 1998.  European
revenue of $368 million increased 11%  from 1998,  primarily  due to acquisition
activity.  Rest of  world revenue  declined  in 1999 primarily due to the impact
of foreign exchange and short-term interest rates.

Insurance  Brokerage and Other Services  quarter and six months segment  results
were impacted positively by acquisitions,  in particular the second quarter 1998
acquisition  of  Le  Blanc  de  Nicolay  and  the  Auto  Insurance   Specialists
acquisition in third quarter 1998. Retail brokerage results continued to reflect
competitive property and casualty pricing in the quarter and six months results.

Pretax  income  grew  3%  in  the quarter over 1998 and six  months 1999  pretax
income,  excluding  first quarter  1999  special  charges, grew  6%  over  1998,
primarily due to both internal  growth  and to  acquisitions.  Pretax margins in
this  segment  declined  slightly  in  1999,  reflecting  investment  in  claims
management   operations,  market-pricing   pressures  and  investment   in   new
initiatives.

                                     - 12 -
<PAGE>

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

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

In the  Consulting  segment,  second  quarter 1999 revenue  increased 4% to $161
million while six months 1999 revenue increased 4% to $317 million.  Acquisition
activity  subsequent  to second  quarter  1998 and  internal  growth  influenced
revenue  growth.  Excluding  the impact of  acquisitions  and foreign  exchange,
revenue for consulting core businesses grew  approximately 7% in the quarter and
6% in six months 1999.

<TABLE>
<CAPTION>
========================================================================================
Consulting
(millions)                     Second quarter ended June 30,   Six months ended June 30,
                                     1999          1998          1999          1998
========================================================================================

<S>                               <C>             <C>           <C>            <C>
Revenue:
   United States                  $      98       $     100     $      189     $     187
   United Kingdom                        38              34             72            66
   Europe                                 9               7             25            20
   Rest of World                         16              14             31            32
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Total Revenue                     $     161       $     155     $      317     $     305
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------

Income before income tax
   excluding special charges      $      19       $      15     $       36     $      30
Special Charges                           -               -            (44)            -
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Income (loss) before income tax   $      19       $      15     $       (8)    $      30
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
</TABLE>


U.S.  revenue  of $98  million  in second  quarter  1999 was down 2% from  1998,
reflecting  lower than anticipated  revenues for human resources  consulting and
change management operations. United Kingdom and European revenue of $47 million
increased  15%  from  1998,  primarily  reflecting  favorable  performance  at a
majority of foreign business units. Rest of world revenues  increased $2 million
in the quarter when compared to prior year.

U.S.  revenue of $189  million in six  months  1999 was up 1% from 1998.  United
Kingdom and European revenue of $97 million  increased 13% from 1998. The impact
of foreign  exchange rates  contributed to a $1 million decline in rest of world
revenues when compared to prior year.

Pretax income  increased to $19 million from $15 million in second quarter 1998,
a 27% increase.  The increase  reflects  international  revenue growth mentioned
above and strong organic growth in the U.S. employee benefits operations, United
Kingdom  and  Canada.  Pretax  margins in this  segment  increased  in 1999 when
compared to prior year.

Pretax income in six months 1999 increased $6 million or 20%  reflecting  strong
organic revenue growth and reductions in overall expenses.

                                     - 13 -
<PAGE>

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

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

<TABLE>
<CAPTION>
========================================================================================
Insurance Underwriting
(millions)                     Second quarter ended June 30,   Six months ended June 30,
                                     1999          1998          1999          1998
========================================================================================

<S>                               <C>             <C>           <C>            <C>
Revenue:
   Direct sales                   $   275         $   261       $     540      $     519
   Extended warranty                  163             157             336            316
   Specialty and other                 64              65             123            122
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Total revenue                     $   502         $   483       $     999      $     957
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Income before income tax          $    75         $    69       $     139      $     133
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------

Revenue:
   United States                  $   349         $   334       $     691      $     671
   United Kingdom                      79              75             161            143
   Europe                              28              30              58             56
   Rest of World                       46              44              89             87
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
Total revenue                     $   502         $   483       $     999      $     957
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------------------------
</TABLE>


Revenue was $502 million in second  quarter 1999,  up 4% from 1998.  Revenue was
$999 million in six months  1999,  up 4% from 1998.  Direct  sales  continued to
expand its product  distribution  through  worksite  marketing  programs and the
introduction of new product  initiatives on a global basis. Auto credit business
continues to runoff.

U.S.  revenue of $349 million was up 4% in second quarter 1999,  principally due
to growth in revenues for direct sales and  appliance  and  electronic  warranty
lines of business.  United Kingdom and European revenue of $107 million rose 2%.
Rest of world revenue was $46 million, up $2 million from prior year.

U.S.  revenue of $691 million was up 3% in six months 1999,  principally  due to
growth in revenues for direct sales and the mechanical extended warranty line of
business.  United  Kingdom  and  European  revenue  of $219  million  rose  10%,
primarily  reflecting  a higher  volume of new  business  in the  appliance  and
electronic extended warranty lines. Rest of world revenue was $89 million, up $2
million from prior year.

Pretax income  increased $6 million or 9% in second  quarter 1999 and $6 million
or 5% in six months  1999 when  compared  to prior  year.  Growth in the quarter
reflects  revenue  earned  from the  introduction  of several  new direct  sales
products and worksite marketing in addition to expense ratio improvements in the
extended  warranty  lines.  Start-up  costs  related to new direct sales product
initiatives  and investments in new products  partially  offset the direct sales
revenue growth and extended warranty improvements.  Overall, benefit and expense
margins  in  second  quarter  1999  did not  suggest  any  significant  shift in
operating trends.

                                     - 14 -
<PAGE>

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

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

<TABLE>
<CAPTION>
=======================================================================================
Corporate and Other
(millions)                   Second quarter ended June 30,   Six months ended June 30,
                                  1999          1998           1999          1998
=======================================================================================

<S>                               <C>             <C>           <C>            <C>
Total revenue                  $     40      $     31        $     89      $     78
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------------------
Loss before income tax         $    (22)     $    (26)       $    (28)     $    (36)
- - - - - - - - - - - - - - - - - ---------------------------------------------------------------------------------------
</TABLE>

Corporate and Other revenue for the second  quarter 1999 was $40 million,  up $9
million from the second quarter 1998. In the quarter,  there was a settlement of
a dispute  with an  unrelated  third  party for $8.5  million.  Six months  1999
revenue was $89 million,  up $11 million from prior year. Included in six months
1999 was  approximately  $30 million of gains from  disposal of $500  million in
tax-exempt  bonds in first  quarter  1999.  The  sale of  these  bonds  (and the
reinvestment  of proceeds in foreign  source  income  securities)  was part of a
program designed to enable Aon to fully utilize foreign tax credits.  The switch
from  tax-exempt to taxable bonds  increased Aon's effective tax rate from 37.5%
in first  quarter  1999 to 38.25% in second  quarter  1999.  Less  revenue  from
private equity  investments  and lower yields on corporate  assets  affected six
months  1999  revenue  growth.  The  timing  of  revenues  from  private  equity
investments varies  significantly  between periods. The goal is long-term yields
from private equities which exceed long-term security market rates.

Corporate  and Other  expenses for the quarter  were $62 million,  up $5 million
from the same period last year.  Six months 1999 expenses were $117 million,  up
$3 million  from prior year.  Expenses in this  segment are composed of interest
expense,  goodwill  amortization  and general  expenses.  For the second quarter
1999,  Corporate and Other expenses also included costs related to the launch of
the Aon branding campaign. For the quarter and six months,  interest expense and
goodwill  amortization  increased  over prior year,  reflecting the financing of
acquisitions  made during the last twelve months.  General  expenses,  excluding
branding, were down somewhat, in line with expectations.

                                     - 15 -
<PAGE>

              NET INCOME FOR SECOND QUARTER AND SIX MONTHS 1999


References  to share data  reflect the  three-for-two  stock split  announced on
March 19, 1999 and paid on May 17, 1999. Second quarter 1999 net income was $151
million ($0.57  dilutive per share) compared to $140 million ($0.54 dilutive per
share) in 1998. Six months 1999 net income was $201 million ($0.76  dilutive per
share)  compared to $278 million ($1.07  dilutive per share) in 1998. Six months
1999 net income was primarily  influenced by after-tax  1999 special  charges of
$102  million  ($0.39 per share) with no  comparable  amount in six months 1998.
Basic net income per share,  including 1999 special charges, was $0.58 and $0.55
in second quarter 1999 and 1998, respectively, and $0.77 and $1.09 in six months
1999 and 1998,  respectively.  Dividends on the redeemable  preferred stock have
been deducted from net income to compute income per share.

The  effective  tax rate was  increased  to 38.25% for second  quarter 1999 from
37.5% in first quarter 1999 and 1998 as part of a program designed to enable Aon
to fully  utilize  foreign tax credits by switching  from  tax-exempt to taxable
bonds.  Dilutive average shares outstanding for second quarter 1999 increased 2%
when  compared to 1998,  primarily  due to the  reissuance of common shares from
treasury  for employee  stock  compensation  benefits,  increase in common stock
equivalents and, to a lesser extent, for acquisition financing.



                       CASH FLOW AND FINANCIAL POSITION
                        AT THE END OF SIX MONTHS 1999


Cash  flows  provided  by  operating  activities  in six  months  1999 were $357
million, a decrease of $427 million from six months 1998. The decrease primarily
represents the  timing  of the settlement of brokerage receivables  and payables
and special charges in first quarter 1999.

Investing  activities  used cash of $363 million,  which was made available from
financing  and  operating  activities.  Cash of $49 million  was used during six
months  1999  for  the  purchase  of  short-term  investments.   Cash  used  for
acquisition  activity  during  six  months  1999  was  $177  million,  primarily
reflecting brokerage acquisitions.

Cash  totaling $326 million was provided  during six months 1999 from  financing
activities. This was primarily due to the issuance of $250 million of  6.9% debt
securities in  second  quarter  1999.  Cash  was used to pay  dividends of  $100
million on  common stock and $1 million on redeemable preferred stock during six
months 1999.

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

                                     - 16 -
<PAGE>

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 billion,  Aon's  total fixed  maturity
portfolio is invested  primarily in investment  grade  holdings  (95%) and has a
fair value which is 99.5% of amortized cost.

Total assets increased $1.3 billion to $21 billion since year-end 1998. Invested
assets at June 30, 1999  decreased $94 million from year-end levels, principally
reflecting  declines in market value and the impact of  foreign  exchange rates.
At June 30, 1999, less than investment  grade fixed maturity investments had  an
amortized cost of $155 million  and a fair value of $156  million.  The carrying
value of  non-income producing  investments in Aon's  portfolio at June 30, 1999
was $36 million, or 0.6% of total invested assets.

Aon uses derivative financial instruments  (primarily financial futures,  swaps,
options  and  foreign   exchange   forwards)  to:  (a)  hedge  foreign  currency
translation and transaction  risks and other business risks (i.e.  interest rate
and  credit  risk);  (b)  hedge  asset  price  risk  associated  with  financial
instruments whose change in value is reported under SFAS 115; and (c) manage its
overall  asset/liability  duration  match.  As of June  30,  1999,  Aon had open
contracts, related to the above, which had unrealized losses of approximately $8
million.

Insurance brokerage and consulting services  receivables  increased $696 million
when  compared to year-end  1998.  Insurance  premiums  payable  increased  $692
million in six months 1999,  reflecting  acquisitions  and the receipt of client
fiduciary funds.

Short-term  borrowings  increased  at the end of six months  1999 by $82 million
when  compared  to  year-end  1998.  During  second  quarter  1999,   short-term
borrowings were reduced by proceeds from the 6.9% debt securities  issuance (see
below). The net increase in short-term borrowings, compared to year-end 1998, is
principally  due to the financing of  acquisitions  and other general  corporate
purposes. Notes payable increased at the end of six months 1999 by $234  million
when compared to year-end 1998. The principal  factor  influencing this increase
is the issuance of $250 million of 6.9% debt  securities due June 2004 (see note
6).  Included in notes payable at June 30, 1999 is  approximately  $105 million,
which  represents  the  principal  amount of notes due within one year.  Of this
amount,  approximately $100 million represents Aon's 6.875% debt securities, due
October 1, 1999,  which are  anticipated to be redeemed at 100% of the principal
amount plus accrued interest.

Stockholders'  equity  increased  $101  million in six months 1999 to $12.17 per
share, an increase of $0.34 per share since year-end 1998. The principal factors
influencing  this  increase  were net income  (which  includes  $102  million of
after-tax special charges) and a $65 million reduction of the additional minimum
pension  liability due to the revaluation of the U.K.  pension plans.  Partially
offsetting this increase were net unrealized  investment losses of $100 million,
net foreign exchange losses of $45 million and dividends to stockholders of $101
million.  Unrealized  investment gains and losses and foreign exchange gains and
losses   fluctuations  from  period  to  period  are  largely  based  on  market
conditions.



                        YEAR 2000 READINESS DISCLOSURE


Aon's State of Readiness
- - - - - - - - - - - - - - - - - ------------------------
Aon is  affected  by both  its own  computer  information  systems  and by third
parties  with which it has business  relationships,  in the  processing  of data
relating to the Year 2000 and beyond.  Aon began work on the computer  Year 2000
issue in 1995 and  expects to complete  substantially  all of its efforts by the
end of third quarter 1999. In 1997, Aon designated a full-time Year 2000 project
coordinator  who  established

                                     - 17 -
<PAGE>

Aon's Year 2000 project office to  monitor  the progress of and act as a central
contact  for  its major business units worldwide.  Year  2000 efforts  under the
direction of the Aon  Executive Vice President of Business Systems Solutions are
focused primarily on two areas:  internal  systems  readiness  and  readiness of
carriers with whom Aon places  insurance  business on behalf of its clients.


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

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

Progress and concerns are reported to Aon's senior and business unit management.
A written  report was  prepared  for  management  for any  business  unit with a
mission  critical  application  on the  watch  list as of June 30,  1999.  These
applications  will be  tracked  by the  2000  program  office  and  reported  to
management monthly.

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

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

                                     - 18 -
<PAGE>

Third Parties
- - - - - - - - - - - - - - - - - -------------
Third parties having a material  relationship  with Aon have Year 2000 issues to
address and resolve.  Such third parties primarily include issuers of investment
securities,  financial  institutions,  governmental agencies,  telecommunication
companies, and insurance carriers. An aspect of the project is to identify these
third parties and contact them to seek written assurance as to the third party's
anticipation of being Year 2000 compliant. The nature of Aon's follow-up depends
upon its  assessment  of the  response and of the  materiality  of the effect of
non-compliance by third parties on Aon.  Significant third parties determined to
be at risk for Year 2000 failure will be reported to appropriate  Aon management
for possible  preemptive  action to minimize adverse impact on Aon's operations.
As of June 30, 1999, Aon is not aware of any significant third party with a Year
2000 issue that would materially impact Aon's results of operations,  liquidity,
or capital  resources.  However,  Aon has no means of  ensuring  that such third
parties  will be Year 2000 ready.  The  inability  of third  parties to complete
their Year 2000 remediation  process in a timely fashion could materially impact
Aon. The effect of non-compliance by third parties is not determinable.

In 1998,  Aon compiled  information  on and assessed  the  compliance  status of
insurance  carriers  with whom it  places  business  on  behalf of its  clients.
Questionnaires were sent to approximately 2,700 carriers worldwide. An intensive
follow-up  effort,  focusing on U.S.  carriers who receive the bulk of insurance
placements by U.S.  business  units,  produced a response rate of close to 100%.
Aon is in the  process of updating  compliance  status on all U.S.  carriers.  A
similar  update effort for  significant  non-U.S.  carriers is being executed in
London. Both efforts are expected to be completed by the end of August 1999.


Costs to Address Aon's Year 2000 Issues
Aon's Year 2000  remediation  costs for all business  units are  projected to be
approximately  $70 million  through  December 31, 1999. As of June 30, 1999, Aon
has incurred  approximately  $57 million  related to all phases of the Year 2000
project. Virtually all of the total remaining project costs will be incurred and
expensed in third quarter 1999.  These costs are being funded  through  business
unit operating cash flows.


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


Aon's Contingency Plans
Contingency  planning  at Aon has two  distinct  components.  First,  all  major
business  units require both a Millennium  Event Plan and a Business  Continuity
Plan. These plans are being developed on a business unit basis and are scheduled
for completion by September 30, 1999. Secondly, technical contingency plans have
been successfully  invoked for a number of business units to date. These include
changing compliance  strategies from replacement to remediation (and vice versa)
and partial  remediation  to meet critical dates  prior to January 1, 2000.  The
latter will require  completion of full remediation in 1999. In

                                     - 19 -
<PAGE>

addition, preparations must be made for IT software and hardware  that have Year
2000  "bugs" and that are not  revealed  until after December 31, 1999,  despite
testing. Aon anticipates handling these situations with immediate program fixes,
swapped backup hardware or  process  work-around.  Aon does not anticipate  that
problems  of  this  nature will  be significant  due to thorough testing and the
distributed nature of Aon's systems.


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

The condensed  consolidated  financial  statements at June 30, 1999, and for the
second quarter and six months then ended have been reviewed, prior to filing, by
Ernst & Young LLP,  Aon's  independent  auditors,  and their  report is included
herein.


                                     - 20 -
<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,  1999,  and the  related  condensed
consolidated  statements of income for the  three-month  and  six-month  periods
ended June 30, 1999 and 1998, and the condensed consolidated  statements of cash
flows for the six-month  periods ended June 30, 1999 and 1998.  These  financial
statements are the responsibility of the Company's management.

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

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

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


                                                /s/ ERNST & YOUNG LLP
                                                ----------------------
                                                ERNST & YOUNG LLP

Chicago, Illinois
August 3, 1999


                                     - 21 -
<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, 1999.


                                    SIGNATURE

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

                                    Aon Corporation
                                    (Registrant)

August 16, 1999                     /s/ Harvey N. Medvin
                                    --------------------------------------------
                                    HARVEY N. MEDVIN
                                    EXECUTIVE VICE PRESIDENT AND
                                    CHIEF FINANCIAL OFFICER
                                    (Principal Financial and Accounting Officer)


                                     - 22 -
<PAGE>

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

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




                                     - 23 -
<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)                  1999    1998   1998    1997    1996   1995    1994
                                          ------  ------ ------- ------  ------ ------- -------
<S>                                       <C>     <C>     <C>    <C>     <C>     <C>     <C>
 Income from continuing operations
    before provision for income taxes (1) $ 356   $ 477  $  931  $ 542   $ 446   $ 458   $ 397

 Add back fixed charges:

    Interest on indebtedness                 45      41      87     70      45      56      46

    Interest on ESOP                          1       2       2      3       4       5       6

    Portion of rents representative of
      interest factor                        25      22      51     44      29      21      29

                                          ------  ------ ------- ------  ------  ------  ------
         Income as adjusted               $ 427   $ 542  $1,071  $ 659   $ 524   $ 540   $ 478
                                          ======  ====== ======= ======  ======  ======  ======

 Fixed charges:

    Interest on indebtedness              $  45   $  41  $   87  $  70   $  45   $  56   $  46

    Interest on ESOP                          1       2       2      3       4       5       6

    Portion of rents representative of
       interest factor                       25      22      51     44      29      21      29

                                          ------  ------ ------- ------  ------  ------  ------
         Total fixed charges              $  71   $  65  $  140  $ 117   $  78   $  82   $  81
                                          ======  ====== ======= ======  ======  ======  ======

 Ratio of earnings to fixed charges         6.0     8.4     7.6    5.6     6.7     6.6     5.9
                                          ======  ====== ======= ======  ====== ======   ======

 Ratio of earnings to fixed charges (2)     8.3                    7.1     7.9
                                          ======                 ======  ======
<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes  special  charges of $163 million for the six
      months  ended June 30,  1999,  $172  million  for the year ended  December
      31, 1997 and $90 million for 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 the six months ended June
      30, 1999 and for the years ended December 31, 1997 and 1996.
</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)                       1999   1998   1998   1997   1996    1995   1994
                                               ------ ------ ------ ------- ------ ------ ------
<S>                                            <C>    <C>    <C>     <C>    <C>    <C>    <C>
 Income from continuing operations
    before provision for income taxes (1)      $ 356  $ 477  $ 931   $ 542  $ 446  $ 458  $ 397

 Add back fixed charges:

    Interest on indebtedness                      45     41     87      70     45     56     46

    Interest on ESOP                               1      2      2       3      4      5      6

    Portion of rents representative of
      interest factor                             25     22     51      44     29     21     29

                                               ------ ------ ------  ------ ------ ------ ------
         Income as adjusted                    $ 427  $ 542  $1,071  $ 659  $ 524  $ 540  $ 478
                                               ====== ====== ======  ====== ====== ====== ======

 Fixed charges and preferred stock dividends:

    Interest on indebtedness                   $  45  $  41  $  87   $  70  $  45  $  56  $  46

    Preferred stock dividends                     35     35     70      82     29     38     48

                                               ------ ------ ------  ------ ------ ------ ------
         Interest and dividends                   80     76    157     152     74     94     94

    Interest on ESOP                               1      2      2       3      4      5      6

    Portion of rents representative of
       interest factor                            25     22     51      44     29     21     29

                                               ------ ------ ------  ------ ------ -----  ------
         Total fixed charges and preferred
             stock dividends                   $ 106  $ 100  $ 210   $ 199  $ 107  $ 120  $ 129
                                               ====== ====== ======  ====== ====== ====== ======

 Ratio of earnings to combined fixed
   charges and preferred stock dividends (2)     4.0    5.4    5.1     3.3    4.9    4.5    3.7
                                               ====== ====== ======  ====== ====== ====== ======

 Ratio of earnings to combined fixed
   charges and preferred stock dividends (3)     5.6                   4.2    5.8
                                               ======                ====== ======
<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority  interest  includes  special  charges of $163 million for the six
      months  ended June 30,  1999,  $172  million  for the year ended  December
      31, 1997 and $90 million for the year ended December 31, 1996.

(2)   Included in total fixed  charges and  preferred  stock  dividends  are $32
      million for the six months  ended June 30, 1999 and 1998,  $66 million for
      the year ended  December  31, 1998  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 the six months ended June
      30, 1999 and for the years ended December 31, 1997 and 1996.
</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  3,  1999  relating  to  the  unaudited  condensed  consolidated  interim
financial  statements of Aon Corporation  that are included in its Form 10-Q for
the quarter ended June 30, 1999:

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

      S-8      33-27984    Pertaining to Aon's savings plan
      S-8      33-42575    Pertaining  to Aon's  stock  award  plan and  stock
                              option plan
      S-8      33-59037    Pertaining  to Aon's  stock  award  plan and  stock
                              option plan
      S-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
      S-3      333-78723   Pertaining to the  registration of debt securities,
                              preferred stock and 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 3, 1999


<PAGE>

<TABLE> <S> <C>

<ARTICLE>                                     5
<LEGEND>
     This schedule contains summary financial information extracted from
     Condensed Consolidated Statements of Financial Position and Condensed
     Consolidated Statements of Income and is qualified in its entirety by
     reference to such financial statements.
</LEGEND>
<MULTIPLIER>                  1,000,000
<CURRENCY>                     USD

<S>                            <C>
<PERIOD-TYPE>                        6-MOS
<FISCAL-YEAR-END>              DEC-31-1999
<PERIOD-START>                 JAN-01-1999
<PERIOD-END>                   JUN-30-1999
<EXCHANGE-RATE>                        1.0
<CASH>                               3,239 <F1>
<SECURITIES>                         3,638 <F2>
<RECEIVABLES>                        7,410
<ALLOWANCES>                            91
<INVENTORY>                              0
<CURRENT-ASSETS>                         0 <F3>
<PP&E>                               1,506
<DEPRECIATION>                         786
<TOTAL-ASSETS>                      21,004
<CURRENT-LIABILITIES>                    0 <F3>
<BONDS>                                814 <F4>
                  850 <F5>
                              0
<COMMON>                               258 <F6>
<OTHER-SE>                           2,860
<TOTAL-LIABILITY-AND-EQUITY>        21,004
<SALES>                                  0
<TOTAL-REVENUES>                     3,422
<CGS>                                    0
<TOTAL-COSTS>                            0
<OTHER-EXPENSES>                     3,066 <F7>
<LOSS-PROVISION>                         0
<INTEREST-EXPENSE>                      45
<INCOME-PRETAX>                        356
<INCOME-TAX>                           135
<INCOME-CONTINUING>                    221
<DISCONTINUED>                           0
<EXTRAORDINARY>                          0
<CHANGES>                                0
<NET-INCOME>                           201
<EPS-BASIC>                         0.77 <F6>
<EPS-DILUTED>                         0.76 <F6>
<FN>
<F1>  Includes short-term investments.
<F2>  Includes fixed maturities and equity securities at fair value.
<F3>  Not applicable based on current reporting format.
<F4>  Represents notes payable.
<F5>  Redeemable  preferred  stock.   Includes   Company-obligated   Mandatorily
      Redeemable Preferred Capital Securities of Subsidiary Trust Holding Solely
      the Company's Junior Subordinated Debentures.
<F6>  Adjusted to reflect three-for-two stock split effective May 4,1999.
<F7>  Represents total expenses.
</FN>


</TABLE>


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