AON CORP
10-Q, 1999-11-15
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 SEPTEMBER 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 9-30-99
                    -----                                   -------------
           $1.00 par value Common                            256,634,418
 (Adjusted to reflect a three-for-two stock split
   paid on May 17, 1999 to stockholders of
            record on May 4, 1999)

<PAGE>
                                     Part 1
                              Financial Information
<TABLE>
<CAPTION>
                                       Aon CORPORATION
                   Condensed Consolidated Statements of Financial Position

 (millions)                                                As of          As of
                                                      Sept. 30, 1999  Dec. 31, 1998
                                                     ------------------------------
<S>                                                       <C>            <C>
 Assets                                               (Unaudited)

 Investments

   Fixed maturities at fair value                        $  2,682       $  3,103

   Equity securities at fair value                            613            768

   Short-term investments                                   2,509          2,221

   Other investments                                          679            360

                                                        ----------     ----------
       Total investments                                    6,483          6,452


 Cash                                                         871            723


 Receivables

   Insurance brokerage and consulting
        services                                            5,797          5,423

   Premiums and other                                       1,195          1,120

   Accrued investment income                                   62             63

                                                        ----------     ----------
       Total receivables                                    7,054          6,606


 Intangible assets                                          3,842          3,500


 Other assets                                               2,863          2,407

                                                        ----------     ----------
       Total Assets                                      $ 21,113       $ 19,688
                                                        ==========     ==========


                                                          As of          As of
                                                      Sept. 30, 1999  Dec. 31, 1998
                                                     ------------------------------
 Liabilities and Stockholders' Equity                 (Unaudited)

 Insurance Premiums Payable                              $  7,435       $  6,948

 Policy Liabilities
   Future policy benefits                                   1,009            986
   Policy and contract claims                                 797            779
   Unearned and advance premiums                            1,931          1,797
   Other policyholder funds                                 1,282          1,261
                                                        ----------     ----------
       Total policy liabilities                             5,019          4,823

 General Liabilities
   General expenses                                         1,033          1,259
   Short-term borrowings                                    1,129            844
   Notes payable                                              817            580
   Other liabilities                                        1,674          1,367
                                                        ----------     ----------
       Total Liabilities                                   17,107         15,821


 Commitments and Contingent Liabilities

 Redeemable Preferred Stock                                    50             50

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


 Stockholders' Equity
   Common stock - $1 par value                                259            172
   Paid-in additional capital                                 515            450
   Accumulated other comprehensive loss                      (263)          (116)
   Retained earnings                                        2,948          2,782
   Less - Treasury stock at cost                              (66)           (58)
          Deferred compensation                              (237)          (213)
                                                        ----------     ----------
       Total Stockholders' Equity                           3,156          3,017

                                                        ----------     ----------
       Total Liabilities and Stockholders' Equity        $ 21,113       $ 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)

                                                                       Third Quarter Ended             Nine Months Ended
                                                                   -----------------------------  -----------------------------
 (millions except per share data)                                  Sept. 30, 1999 Sept. 30, 1998  Sept. 30, 1999 Sept. 30, 1998
                                                                   -------------- --------------  -------------- --------------
<S>                                                                     <C>            <C>             <C>            <C>
 REVENUE
    Brokerage commissions and fees ............................         $ 1,127        $ 1,023         $ 3,382        $ 3,079
    Premiums and other ........................................             475            431           1,353          1,271
    Investment income .........................................             168            153             457            441
                                                                      ----------    -----------      ----------     ----------
       TOTAL REVENUE ..........................................           1,770          1,607           5,192          4,791
                                                                      ----------    -----------      ----------     ----------

 EXPENSES
    General expenses ..........................................           1,222          1,119           3,698          3,271
    Benefits to policyholders .................................             244            220             720            673
    Interest expense ..........................................              29             23              74             64
    Amortization of intangible assets .........................              36             30             105             91
                                                                      ----------    -----------      ----------     ----------
       TOTAL EXPENSES .........................................           1,531          1,392           4,597          4,099
                                                                      ----------    -----------      ----------     ----------

 INCOME BEFORE INCOME TAX AND MINORITY INTEREST ...............             239            215             595            692
    Provision for income tax ..................................              91             80             226            259
                                                                      ----------    -----------      ----------     ----------
 INCOME BEFORE MINORITY INTEREST ..............................             148            135             369            433
    Minority interest - 8.205% trust preferred capital securities           (10)           (11)            (30)           (31)
                                                                      ----------    -----------      ----------     ----------
 NET INCOME ...................................................         $   138        $   124         $   339        $   402
                                                                      ==========    ===========      ==========     ==========
    Preferred stock dividends .................................              (1)            (1)             (2)            (2)
                                                                      ----------    -----------      ----------     ----------
 NET INCOME AVAILABLE FOR COMMON STOCKHOLDERS .................         $   137        $   123         $   337        $   400
                                                                      ==========    ===========      ==========     ==========

 NET INCOME PER SHARE (1):
    Basic net income per share ................................         $  0.53        $  0.48         $  1.30        $  1.57
                                                                      ==========    ===========      ==========     ==========
    Dilutive net income per share .............................         $  0.52        $  0.47         $  1.28        $  1.54
                                                                      ==========    ===========      ==========     ==========

 CASH DIVIDENDS PAID ON COMMON STOCK (1) ......................         $  0.21        $  0.19         $  0.61        $  0.55
                                                                      ==========    ===========      ==========     ==========

 Dilutive average common and common equivalent shares outstanding (1)     264.2          260.9           263.3          258.9
                                                                      ----------    -----------      ----------     ----------
<FN>
(1)   Reflects the three-for-two stock split effective May 4, 1999.
</FN>
</TABLE>
See the accompanying notes to the condensed consolidated financial statements.

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


                                                                                            Nine Months Ended
                                                                                     --------------------------------
                                                                                        Sept. 30         Sept. 30
 (millions)                                                                               1999             1998
                                                                                     ---------------  ---------------
<S>                                                                                           <C>              <C>
 Cash Provided by Operating Activities ........................................            $    478         $    707

 Cash Flows from Investing Activities:
   Sale of investments
        Fixed maturities
            Maturities ........................................................                  53               82
            Calls and prepayments .............................................                 146               72
            Sales .............................................................                 999            1,848
        Equity securities .....................................................                 404            1,755
        Other investments .....................................................                  35               59
   Purchase of investments
        Fixed maturities ......................................................                (905)          (2,041)
        Equity securities .....................................................                (352)          (1,769)
        Other investments .....................................................                (256)            (104)
   Purchase of short-term investments - net ...................................                (249)            (484)
   Acquisition of subsidiaries ................................................                (373)            (323)
   Property and equipment and other ...........................................                (195)            (170)
                                                                                         -----------      -----------
            Cash Used by Investing Activities .................................                (693)          (1,075)
                                                                                         -----------      -----------

 Cash Flows from Financing Activities:
    Treasury stock transactions - net .........................................                 (22)              10
    Issuance of short-term borrowings - net ...................................                 328              289
    Issuance of long-term debt ................................................                 255                -
    Repayment of long-term debt ...............................................                   -              (27)
    Interest sensitive life, annuity and investment contracts
        Deposits ..............................................................                 297              400
        Withdrawals ...........................................................                (335)             (80)
    Cash dividends to stockholders ............................................                (156)            (146)
                                                                                         -----------      -----------
            Cash Provided by Financing Activities .............................                 367              446
                                                                                         -----------      -----------

 Effect of Exchange Rate Changes on Cash ......................................                  (4)               8
 Increase in Cash .............................................................                 148               86
 Cash at Beginning of Period ..................................................                 723            1,085
                                                                                         -----------      -----------
 Cash at End of Period ........................................................            $    871         $  1,171
                                                                                         ===========      ===========

</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 amounts 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)
      ----------------------------------------------------

      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 third
      quarter and nine months ended September 30, 1999 and 1998 are as follows:

<TABLE>
<CAPTION>
      (millions)                         Third Quarter Ended                 Nine Months Ended
                                         -------------------                 -----------------
                                    Sept. 30, 1999  Sept. 30, 1998    Sept. 30, 1999  Sept. 30, 1998
                                    --------------  --------------    --------------  --------------

<S>                                     <C>              <C>              <C>            <C>
      Net income                           $  138        $   124           $   339        $  402
      Net unrealized investment losses        (55)           (70)             (155)          (82)
      Net foreign exchange gains (losses)     (12)             9               (57)            3
      Net additional minimum pension
          liability reduction                   -              -                65             -
                                         ---------     ----------        ----------     ---------
      Comprehensive income                 $   71        $    63           $   192        $  323
                                         =========     ==========        ==========     =========
</TABLE>


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

<TABLE>
<CAPTION>
                                                     September 30,     December 31,
       (millions)                                        1999              1998
                                                     -------------    --------------

<S>                                                    <C>                <C>
       Net unrealized investment gains (losses)        $      (77)        $     78
       Net foreign exchange losses                           (155)             (98)
       Net additional minimum pension liability               (31)             (96)
                                                     -------------      ------------
       Accumulated other comprehensive loss            $     (263)        $   (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 13 through
      16 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 nine months 1999,  Aon reissued 1.4 million  shares of common stock
      from treasury for employee  benefit plans and 720,000 shares in connection
      with the employee stock purchase plan. Aon purchased 1.8 million shares of
      its common  stock at a total cost of $72 million  during nine months 1999.
      There  were 1.9  million  shares  of  common  stock  held in  treasury  at
      September 30, 1999. In addition,  during nine months 1999,  Aon issued 1.2
      million  new shares of common  stock for  employee  benefit  plans and for
      acquisitions.


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 September 30, 1999,  approximately $65 million has been paid related
      to the termination of approximately 870 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. As of September 30, 1999,  approximately
      $8  million  has been paid  related  to redress  payments.  The  remaining
      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

                                     - 7 -
<PAGE>
      the U.K. Pension Investment  Authority for calculating  compensation,  and
      the precise scope, duration, and methodology of the review.

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


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

      Income per share is computed as follows:

<TABLE>
<CAPTION>
      (millions except per       Third Quarter Ended              Nine Months Ended
         share data)             -------------------              ------------------
                            Sept. 30, 1999  Sept. 30, 1998  Sept. 30, 1999  Sept. 30, 1998
      -------------------------------------------------------------------------------------
<S>                                 <C>            <C>            <C>           <C>
      Net income                       $138        $124           $339          $402
      Redeemable preferred stock
         dividends                        1           1              2             2
                                       ----        ----           ----          ----
      Net income for dilutive and
         basic                         $137        $123           $337          $400
                                       ====        ====           ====          =====

      Basic shares outstanding          260         256            259           254
      Common stock equivalents            4           5              4             5
                                       ----        ----           ----          ----
      Dilutive potential common
         shares                         264         261            263           259
      -------------------------------------------------------------------------------------
      Basic net income per share     $ 0.53      $ 0.48         $ 1.30        $ 1.57
      Dilutive net income per share  $ 0.52      $ 0.47         $ 1.28        $ 1.54
      -------------------------------------------------------------------------------------
</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 September  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's  position in the RAR is
      without merit and inconsistent  with numerous  previous IRS private letter
      rulings. Aon has commenced an administrative appeal and intends to contest
      vigorously such  treatment.  Aon believes that if the contracts are deemed
      not to be insurance for tax  purposes,  they would be  recharacterized  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   which  Allianz
      reinsures.  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 managed by Unicover Managers, Inc. ("Unicover"), a New
      Jersey  corporation  not  affiliated  with  Aon.  The  Unicover  pool  and
      facilities  provided  reinsurance  relating to certain  types  of workers'
      compensation coverage.Allianz alleges that Centaur Underwriting Management
      Ltd.  ("Centaur"),  a Bermuda-based  entity not  affiliated with Aon, is a
      managing general underwriter that held underwriting authority for, and was
      an  authorized agent of, the APS  Insurers,  but has not named  Centaur as
      a  defendant.  Allianz further alleges that the Aon subsidiary acted as an
      agent  of  the APS Insurers  when placing  reinsurance  coverage  on their
      behalf. 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.
      Allianz  has  also  asserted  claims  against the APS Insurers for alleged
      breach of contract,  alleged breach of fiduciary duty, alleged  negligence
      and  alleged  violations of the  Minnesota  Consumer  Fraud  Act  and  the
      Minnesota Deceptive Trade Practices Act; some of these claims are based in
      part on allegations about the supposed actions  of Centaur and/or the  Aon
      subsidiary. 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 inititated by various persons that relate directly  or  indirectly to
      one  or more  entities managed by Unicover, except for an  action filed to
      compel Aon to produce documents,  to  which  Aon  is  in  the  process  of
      responding,  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.

                                     - 9 -
<PAGE>
13.   Business Combinations
      ---------------------

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



                                     - 10 -
<PAGE>
                                 Aon CORPORATION
                   MANAGEMENT'S ANALYSIS OF OPERATING RESULTS
                             AND FINANCIAL CONDITION

                      REVENUE AND INCOME BEFORE INCOME TAX
                     FOR THIRD QUARTER AND NINE 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 $104 million or 10% in third quarter
1999 and $303 million or 10% in nine months 1999,  reflecting post-third quarter
1998 business combination activity and internal growth.

Premiums and other is primarily  related to insurance  underwriting  operations.
Premiums and other  increased  $44 million or 10% in third  quarter 1999 and $82
million or 6% in nine months  1999,  compared  with the same  periods last year.
Extended  warranty  premiums earned increased $38 million or 27% in the quarter,
primarily  reflecting continued growth in the appliance and electronics warranty
lines.  Direct sales premiums  earned  increased $9 million or 4% reflecting the
recent 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, consolidated investment income increased $15 million or 10% compared to
prior year,  primarily due to income on disposals of private equity  investments
and higher levels of income from private equity and other  investment  holdings.
For nine  months  1999,  investment  income is up $16  million or 4% compared to
1998.  The primary  factors  causing this change are  approximately  $30 million
income on disposal of tax-exempt bonds

                                     - 11 -
<PAGE>
in first quarter 1999, the settlement of a dispute  relating to investments with
a third party in second quarter 1999, and the combination of income on disposals
and higher levels of income from  private  equity  investments. Declining yields
on  fixed  maturity  investments  and  a  reduction in short-term interest rates
partially offset the increase in investment income in the nine months 1999.

Total  revenue  increased  $163  million or 10% in third  quarter  1999 and $401
million or 8% in nine months  1999,  attributable  to  post-third  quarter  1998
brokerage  acquisition activity and internal growth in the operating segments as
well as investment income.

Benefits to policyholders increased $24 million or 11% in third quarter 1999 and
$47  million or 7% in nine  months  1999.  The  increase in the quarter and nine
months was consistent  with growth in related  premiums  earned and reflected no
unusual claims activity.  The run-off of certain specialty liability programs is
now substantially  complete.  Partially  offsetting the increase in policyholder
benefits is the runoff of auto credit business as planned.

Total  expenses  increased $139 million or 10% in third quarter and $498 million
or 12% in nine  months 1999 when  compared  to prior year.  The nine months 1999
increase  reflects the inclusion of first quarter 1999 pretax special charges of
$163 million. Total expenses,  excluding the 1999 special charges,  increased 8%
for the nine months when  compared to 1998.  Third  quarter and nine months 1999
expenses  increased over prior year primarily due to investments in new business
initiatives,  technology,  product development and the branding campaign. 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 in both the
second and third  quarters of 1999. The  revaluation  resulted in a reduction of
pension expense.

Restructuring  liabilities for recent acquisitions and 1999 special charges have
been reduced by payments as planned. Total annualized cost savings are projected
to be  approximately  $50 million  related to first  quarter 1999  restructuring
activity.

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  $24 million or 11% in third quarter 1999.
Nine months  1999 income  before  income tax  decreased  $97 million or 14% when
compared to prior  year,  primarily  due to the  inclusion  of special  charges.
Excluding special charges, income before income tax increased $66 million or 10%
in nine 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.


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
follows.

                                     - 12 -
<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.

Third quarter 1999 Insurance  Brokerage and Other Services revenue increased $89
million  or 10% and nine  months  1999  revenue  increased  $262  million or 9%.
Post-third 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 7% in the
quarter and 6% in nine  months in a  very  competitive  environment.  Investment
income in this segment  decreased  $4 million in third  quarter 1999 compared to
prior year reflecting a reduction in short-term interest rates.

Revenue  earned  related to reinsurance obtained  by  Unicover  pool members and
facilities (see footnote 12 - Contingencies) was $7  million and $16 million for
third quarter and nine months 1999, respectively. Fourth  quarter 1999  Unicover
revenue is expected to be significantly  less than it was in third quarter 1999.
Unicover revenue earned for full year 1998 was $15 million.


<TABLE>
<CAPTION>
========================================================================================
Insurance Brokerage and Other Services
(millions)
                             Third quarter ended Sept. 30,   Nine months ended Sept. 30,
                                   1999          1998             1999          1998
========================================================================================

<S>                               <C>             <C>           <C>            <C>
Revenue:
   United States              $     543       $     493       $ 1,563        $1,360
   United Kingdom                   209             190           616           596
   Europe                           137             130           505           461
   Rest of World                    123             110           345           350
- ----------------------------------------------------------------------------------------
Total revenue                 $   1,012       $     923       $ 3,029        $2,767
- ----------------------------------------------------------------------------------------

Income before income tax
   excluding special charges  $     163       $     144       $   535        $  494
Special charges                       -               -          (119)            -
- ----------------------------------------------------------------------------------------
Income before income tax      $     163       $     144       $   416        $  494
- ----------------------------------------------------------------------------------------
</TABLE>


U.S.  revenue of $543 million in third quarter 1999 was up 10% from 1998.  Total
international  revenues in the quarter increased $39 million or 9% when compared
to prior year.  International  reinsurance business continues to be strong, both
in new business and  retention of existing  business,  particularly  in Ireland,
Spain and The Netherlands.

U.S. revenue of $1.6 billion in nine months 1999 was up 15% from 1998.  European
revenue of $505 million  increased 10% from 1998,  primarily due to  acquisition
activity and new and renewal  business  mentioned  above.  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  third  quarter  and nine  months 1999
segment income results were impacted  positively by acquisitions,  in particular
the Nikols Sedgwick  acquisition in third quarter 1999. Retail brokerage results
continued to reflect  competitive  property and casualty  pricing in the quarter
and nine months results although some tightening of prices was evident.

                                     - 13 -
<PAGE>

Pretax  income  grew 13% in the  quarter  over 1998 and nine  months 1999 pretax
income,  excluding  first  quarter  1999  special  charges,  grew 8% over  1998,
primarily due to both internal  growth and to  acquisitions.  Pretax  margins in
this  segment  improved in the quarter when  compared to prior year,  reflecting
cost savings and some reduction in  market-pricing  pressures.  Nine months 1999
pretax  margin  also  reflected  cost  savings  related  to first  quarter  1999
restructuring activity and improved expense controls.


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

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

In the  Consulting  segment,  third  quarter 1999  revenue  increased 5% to $158
million while nine months 1999 revenue increased 4% to $475 million. Acquisition
activity subsequent to third quarter 1998 and internal growth influenced revenue
growth.  Excluding  the  impact  of  acquisitions,  foreign  exchange,  and  the
reclassification  of certain operating unit results from the  consulting segment
to  the  brokerage   segment,   revenue  for  consulting  core  businesses  grew
approximately 8% in the quarter and 7% in nine months 1999. Investment income in
this   segment  declined  $1  million  in  the  quarter  compared  to prior year
reflecting a reduction in short-term interest rates.

<TABLE>
<CAPTION>
=========================================================================================
Consulting                     Third quarter ended Sept. 30,  Nine Months ended Sept. 30,
(millions)                           1999          1998          1999          1998
=========================================================================================

<S>                               <C>             <C>           <C>            <C>
Revenue:
   United States               $    102      $      99        $     291     $    286
   United Kingdom                    36             33              108           99
   Europe                             7              6               32           26
   Rest of World                     13             12               44           44
- ----------------------------------------------------------------------------------------
Total revenue                  $    158      $     150        $     475     $    455
- ----------------------------------------------------------------------------------------

Income before income tax
   excluding special charges   $     15      $      13        $      51     $     43
Special charges                       -              -              (44)           -
- ----------------------------------------------------------------------------------------
Income before income tax       $     15      $      13        $       7     $     43
- ----------------------------------------------------------------------------------------
</TABLE>


U.S.  revenue of $102 million in third quarter 1999 was up $3 million from 1998.
United  Kingdom and  European  revenue of $43 million  increased  10% from 1998,
primarily  reflecting  favorable  performance at a majority of foreign  business
units, in particular growth emanating  principally from the United Kingdom,  The
Netherlands  and  France.  Rest of world  revenues  increased  $1 million in the
quarter when compared to prior year.

U.S.  revenue of $291  million in nine months  1999 was up 2% from 1998.  United
Kingdom and European  revenue of $140 million  increased 12% from 1998.  Rest of
world revenues were flat when compared to prior year.

                                     - 14 -
<PAGE>

Pretax income increased to $15 million from $13 million in third quarter 1998, a
15% 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 reflecting good expense controls.

Pretax income in nine months 1999 increased $8 million or 19% reflecting  strong
organic revenue growth and reductions in overall expenses.


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    Third quarter ended Sept. 30,   Nine months ended Sept. 30,
(millions)                        1999         1998           1999           1998
=====================================================================================

<S>                             <C>         <C>           <C>           <C>
Revenue:
   Direct sales                 $    275    $    266      $     815     $     785
   Extended warranty                 202         164            538           480
   Specialty and other                63          63            186           185
- -------------------------------------------------------------------------------------
Total revenue                   $    540    $    493      $   1,539     $   1,450
- -------------------------------------------------------------------------------------
Income before income tax        $     75    $     75      $     214     $     208
- -------------------------------------------------------------------------------------

Revenue:
   United States                $    370    $    345      $   1,061     $   1,016
   United Kingdom                     97          75            258           218
   Europe                             27          30             85            86
   Rest of World                      46          43            135           130
- -------------------------------------------------------------------------------------
Total revenue                   $    540    $    493      $   1,539     $   1,450
- -------------------------------------------------------------------------------------
</TABLE>


Revenue was $540 million in third quarter  1999,  up 10% from 1998.  Revenue was
$1.5 billion in nine months 1999, up 6% from 1998.  There was a higher volume of
new business in the appliance and electronics  extended  warranty lines, both in
the  U.S.  and  internationally,  as well  as in the  U.S.  mechanical  extended
warranty line. Direct sales continued to expand its product distribution through
worksite  marketing  programs  and  the  recent   introduction  of  new  product
initiatives  on a global  basis.  Auto  credit  business  continues  to  runoff.
Investment income allocated  to Insurance  Underwriting increased  $2 million in
the quarter when compared to prior year.

U.S. revenue of $370 million was up 7% in third quarter 1999, principally due to
growth in revenues for mechanical warranty and, to a lesser extent, direct sales
lines of business. United Kingdom and European revenue of $124 million rose 18%.
Rest of world revenue was $46 million, up $3 million or 7% from prior year.

U.S.  revenue of $1.1 billion was up 4% in nine 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 $343  million  rose  13%,
primarily  reflecting  a higher  volume of new  business  in the  appliance  and
electronic  extended warranty lines. Rest of world revenue was $135 million,  up
$5 million or 4% from prior year.

                                     - 15 -
<PAGE>

Pretax income in the quarter was flat when  compared  to prior  year,  primarily
reflecting the completion of the profitable runoff of special liability policies
prior to 1999. Nine months 1999  pretax  income  increased  $6  million or 3% in
nine months 1999 when compared to prior year.  Growth  in the  quarter  reflects
revenue earned from the recent introduction of several new direct sales products
and worksite  marketing  in  addition  to  expense  ratio  improvements  in  the
mechanical  extended  warranty line.  Start-up costs related to new direct sales
product initiatives  partially offset  the  direct sales and  extended  warranty
improvements. Overall, benefit  and  expense margins  in third  quarter 1999 did
not suggest any significant shift in operating trends.


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

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

<TABLE>
<CAPTION>

======================================================================================
Corporate and Other       Third quarter ended Sept. 30,    Nine months ended Sept. 30,
(millions)                      1999          1998            1999          1998
======================================================================================
<S>                               <C>            <C>          <C>           <C>
Total revenue                $    60      $    41         $    149      $    119
- --------------------------------------------------------------------------------------
Loss before income tax       $   (14)     $   (17)        $    (42)     $    (53)
- --------------------------------------------------------------------------------------
</TABLE>

Corporate and Other  revenue for the third quarter 1999 was $60 million,  up $19
million from the third  quarter 1998. In the quarter,  revenue  growth  resulted
from higher income levels on private equity  investments  including  significant
income on  private  equity  disposals,  the   proceeds of which  were reinvested
in  similar  types of equity  securities  in accordance  with  Aon's  investment
strategy  for the corporate segment.  Nine months 1999 revenue was $149 million,
up $30 million from prior year.  Included in nine 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 subsequent quarters. Higher  revenue from private  equity  investments
was  partially  offset  by lower yields  on other corporate  assets in  the nine
months 1999. The timing  of revenues  from  private  equity  investments  varies
significantly between periods. The investment strategy for the corporate segment
is to seek long-term total returns from publicly-traded equities and less liquid
private  equities  which exceed long-term security market rates.

Corporate  and Other  expenses for the quarter were $74 million,  up $16 million
from the same period last year. Nine months 1999 expenses were $191 million,  up
$19 million  from prior year.  Expenses in this segment are composed of interest
expense,  goodwill  amortization  and  general  expenses.  Corporate  and  other
expenses also included costs related to the branding campaign launched in second
quarter  1999.  For the quarter and nine months,  interest  expense and goodwill
amortization increased over prior year, reflecting the financing of acquisitions
made during the last twelve months.

                                     - 16 -
<PAGE>
               NET INCOME FOR THIRD QUARTER AND NINE MONTHS 1999

References  to share data  reflect the  three-for-two  stock split  announced on
March 19, 1999 and paid on May 17, 1999.  Third quarter 1999 net income was $138
million ($0.52  dilutive per share) compared to $124 million ($0.47 dilutive per
share) in 1998. Nine months 1999 net income was $339 million ($1.28 dilutive per
share)  compared to $402 million ($1.54 dilutive per share) in 1998. Nine 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 nine months 1998.
Basic net income per share,  including 1999 special charges, was $0.53 and $0.48
in third quarter 1999 and 1998, respectively, and $1.30 and $1.57 in nine 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 the second and  subsequent
quarters of 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 third
quarter 1999 increased 1% 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 NINE MONTHS 1999


Cash flows  provided  by  operating  activities  in nine  months  1999 were $478
million, a decrease of $229 million from nine months 1998.The decrease primarily
represents first quarter 1999 special charges,  payments on  acquisition-related
valuation adjustments, the branding campaign and the timing of the settlement of
brokerage receivables and  payables.  Excluding these  noncomparable items, cash
flow  provided by operating activities  in nine months 1999 was higher than nine
months 1998.

Investing  activities  used cash of $693 million,  which was made available from
financing  and operating  activities.  Cash of $249 million was used during nine
months  1999  for  the  purchase  of  short-term  investments.   Cash  used  for
acquisition  activity  during  nine  months  1999  was $373  million,  primarily
reflecting brokerage acquisitions.

Cash totaling $367 million was provided  during nine months 1999 from  financing
activities.  This was primarily due to the issuance of $250 million of 6.9% debt
securities  in  second quarter  1999. Net short-term borrowing issuances of $328
million in nine months 1999 principally reflect funds provided for the financing
of acquisitions  and  other  general  corporate  purposes.  Cash was used to pay
dividends of $154 million on common stock and $2 million on redeemable preferred
stock during nine 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.

                                     - 17 -
<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 $2.7 billion,  Aon's total fixed maturity
portfolio is invested  primarily in investment  grade  holdings  (95%) and has a
fair value which is 98% of amortized cost.

Total  assets  increased  $1.4 billion to $21.1  billion  since  year-end  1998.
Invested  assets at  September  30, 1999  increased  $31  million  from year-end
levels.  At September  30,  1999,  less than  investment  grade  fixed  maturity
investments had  an amortized cost of $137  million and  a  fair value  of  $130
million.  The  carrying  value of  non-income  producing  investments  in  Aon's
portfolio  at  September 30, 1999  was  $37 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 September 30, 1999, Aon had open
contracts, related to the above, which had unrealized losses of approximately $2
million.

Insurance brokerage and consulting services  receivables  increased $374 million
when  compared to year-end  1998.  Insurance  premiums  payable  increased  $487
million in nine months 1999,  reflecting  acquisitions and the receipt of client
fiduciary funds.

Short-term  borrowings  increased at the end of nine months 1999 by $285 million
when  compared to year-end  1998.  The net  increase in  short-term  borrowings,
compared to year-end 1998, is principally due to the financing of  acquisitions,
common stock  purchases,  and other general  corporate  purposes.  Notes payable
increased  at the end of nine  months  1999 by $237  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  September  30,  1999 is  approximately  $106  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 were  redeemed  at 100% of the  principal  amount  plus  accrued
interest.

Stockholders'  equity  increased  $139 million in nine months 1999 to $12.30 per
share, an increase of $0.47 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  during  the nine  months  1999  were net  unrealized
investment  losses of $155 million,  net foreign  exchange losses of $57 million
and  dividends to  stockholders  of $156  million.  Fluctuations  in  unrealized
investment gains and losses and foreign exchange gains and losses from period to
period  are largely  based on market conditions;  however, they  have  decreased
equity by $232 million on an accumulated basis (see note 4).


                                     - 18 -
<PAGE>
                         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 its  efforts were  substantially  completed  by  the  end  of
third  quarter  1999.  In 1997,  Aon  designated  a full-time  Year 2000 project
coordinator  who  established  Aon's Year 2000  project  office to  monitor  the
progress of and act as a central contact for its major business units worldwide.
Year 2000 efforts  under the direction of the Aon  Executive  Vice  President of
Business Systems Solutions are focused primarily on two areas:  internal systems
readiness and readiness of carriers with whom Aon places  insurance  business on
behalf of its clients.


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.

During  January 1999, a business unit readiness  review and risk  assessment for
each business unit was  performed.  Dates were  established  for internal  audit
reviews to test documentation for major global business units. These audits have
been  substantially  completed and identified issues have been addressed.  Aon's
target  date  to  remediate  or  replace  mission   critical   applications  for
substantially  all business  units was the end of third quarter  1999.  This has
been accomplished for 218 Year 2000 reporting  business units as of November 15,
1999. Four small business units,  two of them recent  acquisitions  and three of
them outside the U.S.,  will complete  testing and  replacement  with  compliant
systems during the fourth quarter 1999 and are on a watch list.  Their status is
reviewed and updated bi-weekly.

Year 2000 Event and Contingency plans are required for all major business units.
An analysis of all newly acquired business units is undertaken immediately after
an  acquisition  is made and  appropriate  Year 2000  actions  taken.  Year 2000
progress and concerns are reported to Aon's senior and business unit management.
A written report was prepared for  management  covering the  four business units
with a mission  critical  application on the watch list as of November 15, 1999.
These  applications  will be tracked by the 2000  program  office and the status
will be reported to management in a timely manner.


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.

                                     - 19 -
<PAGE>
Aon has some risk on a  location  by  location  basis  related  to the  possible
failure  of   government   agencies,   public   utilities   and   providers   of
telecommunication  and  transportation  services.  Due to  Aon's  dispersion  of
facilities,  the largest  concentrated  risks in this regard are in the Chicago,
New York and London locations.


Third Parties
- -------------
Third parties having a material  relationship  with Aon have Year 2000 issues to
address and resolve.  Such third parties primarily include issuers of investment
securities,  financial  institutions,  governmental agencies,  telecommunication
companies, and insurance carriers. An aspect of the project is to identify these
third parties and contact them to seek written assurance as to the third party's
anticipation of being Year 2000 compliant. The nature of Aon's follow-up depends
upon its  assessment  of the  response and of the  materiality  of the effect of
non-compliance by third parties on Aon.  Significant third parties determined to
be at risk for Year 2000 failure will be reported to appropriate  Aon management
for possible  preemptive  action to minimize adverse impact on Aon's operations.
As of September 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. During 1999,
Aon requested  updated  information  from carriers  previously  surveyed,  again
focusing effort on the markets that received most of the  placements.  Responses
were received from 99% of the priority  carriers surveyed and about 80% overall.
A similar  effort to obtain  compliance  information  for non-U.S.  carriers was
executed in London and also produced a response rate of almost 80%.

Costs to Address Aon's Year 2000 Issues
As of September  30, 1999,  Aon's Year 2000  remediation  costs for all business
units is projected to be  approximately  $70 million.  As of September 30, 1999,
Aon has  incurred  approximately  $60 million  related to all phases of the Year
2000 project.  Approximately  $5 million of the remaining  project costs will be
incurred and expensed in the fourth quarter 1999 with $5 million projected to be
spent in the Year 2000.  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.

                                     - 20 -
<PAGE>
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 were
scheduled for  completion by September 30, 1999. Not all were completed and work
will  continue  on  these  plans  in the  fourth  quarter.  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  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.  Aon is establishing a Year
2000  Corporate  Command  Center that will  monitor the progress of the 200 plus
business  units as they  progress  through  the  millennium  transition  period.
Progress updates will be provided to senior management  periodically and problem
situations will be escalated to the appropriate  senior manager  responsible for
the business unit on a timely basis.


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

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


                                     - 21 -
<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 September 30, 1999, and the related  condensed
consolidated  statements of income for the  three-month  and nine-month  periods
ended September 30, 1999 and 1998, and the condensed consolidated  statements of
cash flows for the nine-month  periods ended September 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.



                                                          ERNST & YOUNG LLP

Chicago, Illinois
November 2, 1999

                                     - 22 -
<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 September 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)

November 15, 1999                   /s/ Harvey N. Medvin
                                    --------------------------------
                                    HARVEY N. MEDVIN
                                    EXECUTIVE VICE PRESIDENT AND
                                    CHIEF FINANCIAL OFFICER
                                    (Principal Financial and Accounting Officer)


                                     - 23 -
<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


                                     - 24 -
<PAGE>

<TABLE>
<CAPTION>
                                                                                              Exhibit 12(a)

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


                                          Nine Months Ended
                                            September 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)   $ 595     $ 692     $  931     $ 542      $ 446     $ 458      $ 397

 Add back fixed charges:

    Interest on indebtedness                   74        64         87        70         45        56         46

    Interest on ESOP                            1         2          2         3          4         5          6

    Portion of rents representative of
      interest factor                          38        33         51        44         29        21         29

                                           -------   -------   --------   -------    -------   -------    -------
         Income as adjusted                 $ 708     $ 791     $1,071     $ 659      $ 524     $ 540      $ 478
                                           =======   =======   ========   =======    =======   =======    =======


 Fixed charges:

    Interest on indebtedness                $  74     $  64     $   87     $  70      $  45     $  56      $  46

    Interest on ESOP                            1         2          2         3          4         5          6

    Portion of rents representative of
       interest factor                         38        33         51        44         29        21         29

                                           -------   -------    -------   -------    -------   -------    -------
         Total fixed charges                $ 113     $  99     $  140     $ 117      $  78     $  82      $  81
                                           =======   =======    =======   =======    =======   =======    =======

 Ratio of earnings to fixed charges           6.3       8.0        7.6       5.6        6.7       6.6        5.9
                                           =======   =======    =======   =======    =======   =======    =======

 Ratio of earnings to fixed charges (2)       7.7                            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 nine
      months ended  September 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 nine months ended
      September 30, 1999 and for the years ended December 31, 1997 and 1996.
</FN>
</TABLE>

<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


                                         Nine Months Ended
                                            September 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)    $ 595    $ 692    $  931     $ 542     $ 446    $ 458     $ 397

 Add back fixed charges:

    Interest on indebtedness                    74       64        87        70        45       56        46

    Interest on ESOP                             1        2         2         3         4        5         6

    Portion of rents representative of
      interest factor                           38       33        51        44        29       21        29

                                            -------  -------   -------   -------   -------  -------   -------
         Income as adjusted                  $ 708    $ 791    $1,071     $ 659     $ 524    $ 540     $ 478
                                            =======  =======   =======   =======   =======  =======   =======


 Fixed charges and preferred stock dividends:

    Interest on indebtedness                 $  74    $  64    $   87     $  70     $  45    $  56     $  46

    Preferred stock dividends                   52       52        70        82        29       38        48

                                            -------  -------   -------   -------   -------  -------   -------
         Interest and dividends                126      116       157       152        74       94        94

    Interest on ESOP                             1        2         2         3         4        5         6

    Portion of rents representative of
       interest factor                          38       33        51        44        29       21        29

                                            -------  -------   -------   -------   -------  -------   -------
         Total fixed charges and preferred
             stock dividends                 $ 165    $ 151    $  210     $ 199     $ 107    $ 120     $ 129
                                            =======  =======   =======   =======   =======  =======   =======

 Ratio of earnings to combined fixed
   charges and preferred stock dividends (2)   4.3      5.2       5.1       3.3       4.9      4.5       3.7
                                            =======  =======   =======   =======   =======  =======   =======

 Ratio of earnings to combined fixed
   charges and preferred stock dividends (3)   5.3                          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 nine
      months ended  September 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 $49
      million for the nine months ended September 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 income.

(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 nine months ended
      September 30, 1999 and for the years ended December 31, 1997 and 1996.
</FN>
</TABLE>

                                                                      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
November  2, 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 September 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.




                                                          ERNST & YOUNG LLP

Chicago, Illinois
November 2, 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>                    9-MOS
<FISCAL-YEAR-END>          DEC-31-1999
<PERIOD-START>             JAN-01-1999
<PERIOD-END>               SEP-30-1999
<EXCHANGE-RATE>                    1.0
<CASH>                           3,380 <F1>
<SECURITIES>                     3,295 <F2>
<RECEIVABLES>                    7,118
<ALLOWANCES>                        64
<INVENTORY>                          0
<CURRENT-ASSETS>                     0 <F3>
<PP&E>                           1,531
<DEPRECIATION>                     811
<TOTAL-ASSETS>                  21,113
<CURRENT-LIABILITIES>                0 <F3>
<BONDS>                            817 <F4>
              850 <F5>
                          0
<COMMON>                           259 <F6>
<OTHER-SE>                       2,897
<TOTAL-LIABILITY-AND-EQUITY>    21,113
<SALES>                              0
<TOTAL-REVENUES>                 5,192
<CGS>                                0
<TOTAL-COSTS>                        0
<OTHER-EXPENSES>                 4,597 <F7>
<LOSS-PROVISION>                     0
<INTEREST-EXPENSE>                  74
<INCOME-PRETAX>                    595
<INCOME-TAX>                       226
<INCOME-CONTINUING>                369
<DISCONTINUED>                       0
<EXTRAORDINARY>                      0
<CHANGES>                            0
<NET-INCOME>                       339
<EPS-BASIC>                     1.30 <F6>
<EPS-DILUTED>                     1.28 <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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