AON CORP
10-K, 2000-03-24
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM 10-K

(Mark One)

[X]           ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]
                   For the fiscal year ended December 31, 1999
                                       OR
[ ]         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE
                SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]
                         Commission File Number: 1-7933

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

               DELAWARE
     (State or Other Jurisdiction of                       36-3051915
      Incorporation or Organization)                     (I.R.S. Employer
        123 NORTH WACKER DRIVE,                         Identification No.)
          CHICAGO, ILLINOIS                                   60606
(Address of Principal Executive Offices)                    (Zip Code)
            (312) 701-3000
          (Telephone Number)

           Securities registered pursuant to Section 12(b) of the Act:
                                                      Name of Each Exchange
      Title of Each Class                              on Which Registered
      -------------------                              -------------------
  Common Stock, $1 par value                         New York Stock Exchange*
    7.40% Notes Due 2002                             New York Stock Exchange

        Securities registered pursuant to Section 12(g) of the Act: NONE

*The Common  Stock of the  Registrant  is also listed for trading on the Chicago
          Stock Exchange and the International Stock Exchange London.


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 Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  Registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.       YES  [X]        NO  [ ]


Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of  Registrant's knowledge, in definitive  proxy or information statements,
incorporated  by  reference  in Part III of this  Form  10-K or any amendment to
this Form 10-K. [X]

Aggregate  market  value  of the  voting  stock  held by  non-affiliates  of the
Registrant as of February 23, 2000 was $5,042,411,250.

Number of shares of $1.00 par value Common Stock  outstanding as of February 23,
2000 was 256,453,450.

         DOCUMENTS FROM WHICH INFORMATION IS INCORPORATED BY REFERENCE:
        Annual Report to Stockholders of the Registrant for the Year 1999
                             (Parts I, II and IV)
   Notice of Annual Meeting of Holders of Common Stock and Series C Preferred
 Stock and Proxy Statement for Annual Meeting of Stockholders on April 18, 2000
                         of the Registrant (Part III)

- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
<PAGE>
                                     PART I

ITEM 1.  BUSINESS.

      The Registrant is a holding company whose operating  subsidiaries carry on
business in three distinct segments: (i) insurance brokerage and other services,
(ii) consulting,  and (iii) insurance underwriting.  Incorporated in 1979, it is
the parent corporation of long-established and more recently formed companies.

      The Insurance Brokerage and Other Services segment consists principally of
Aon's retail and reinsurance brokerage operations,  which includes specialty and
wholesale  activity.  These  services  are  provided  by Aon  Group,  Inc.,  its
subsidiaries and certain other indirect subsidiaries of the Registrant (the "Aon
Group")  including  Aon Risk  Services  Companies,  Inc.;  Aon  Holdings bv; Aon
Services Group, Inc.; Aon Re Worldwide, Inc.; Aon Group Limited; and Alternative
Market Operations ("AMO").

      The Consulting  segment provides a range of consulting  services including
employee benefits,  human resources,  compensation and change management.  These
services  are  provided  by Aon  Consulting  Worldwide,  Inc.  which  is  also a
subsidiary of Aon Group.

      Aon Group revenues grew  significantly  in  1997, 1998 and 1999  when  the
Registrant  acquired,  among  other companies,  Alexander &  Alexander  Services
Inc.  ("A&A"),  The  Minet  Group,  and  Jauch &  Hubener  in 1997;  Le Blanc de
Nicolay,  Gil y Carvajal and  Auto Insurance Specialists, Inc. in 1998;  and the
Nikols Group, Presidium Holdings,  Inc. and  Societe Generale d' Assurance et de
Prevoganie in 1999.

      Aon's Insurance  Underwriting  segment is comprised of  direct  sales life
and  accident  and  health insurance,  extended warranty,  specialty  and  other
insurance products. Combined Insurance Company of America ("Combined Insurance")
engages in the  marketing  and  underwriting  of life and  accident  and  health
insurance products.  Virginia Surety Company,  Inc. and London General Insurance
Company Limited  offer  extended  warranty  and  specialty  insurance  products.

      The Registrant  hereby  incorporates  by reference  pages 8 through 17, 19
through  21, and pages 49 and 50 of the  Annual  Report to  Stockholders  of the
Registrant for the Year 1999 ("Annual Report").


COMPETITION AND INDUSTRY POSITION

(1)  INSURANCE BROKERAGE AND OTHER SERVICES

      Aon Group,  Inc. ("Aon Group");  Aon Risk Services  Companies,  Inc. ("Aon
Risk  Services  Companies");  Aon  Holdings bv ("Aon  Holdings");  Aon  Services
Group,  Inc.  ("Aon  Services  Group");  Aon Re Worldwide,  Inc. ("Aon Re"); Aon
Group Limited ("AGL"); Alternative Market Operations ("AMO").

      Aon Group is the holding  company for the  subsidiaries  which conduct the
Registrant's commercial brokerage and consulting operations. Aon Group companies
have 550 offices around the world in 120 countries.  In 1999, Aon Group employed
over 39,000  professionals  and support  personnel to serve the diverse needs of
clients.

      Aon Risk Services Companies'  subsidiaries operate in a highly competitive
industry  and compete  with a large  number of retail  insurance  brokerage  and
agency  firms as well as  individual  brokers  and agents and direct  writers of
insurance  coverage.  Aon Risk  Services  Companies'  subsidiaries  provide risk
management  services,  including insurance  placement,  claims management,  loss
control and  administrative  services.  It has also developed certain specialist
niche  areas  such  as  marine,  aviation,  directors  and  officers  liability,
financial institutions,  construction, energy, media and entertainment. In 1999,
significant  investments  were made in professional  talent,  technology and the
development of  specialized  products and services to meet the evolving needs of
clients.

      Subsidiaries  of Aon Risk  Services  Companies  and Aon  Holdings  operate
through owned offices in North America and Europe,  as well as in South America,
Africa,  Australia and Asia. The acquisition of A&A significantly  augmented the
Registrant's  presence in Latin America,  Asia,  Africa and  Australia,  and the
acquisitions  of Jauch &

                                     - 2 -
<PAGE>
Hubener,  Le Blanc de Nicolay,  Gil y Carvajal and The Nikols Group strengthened
the Registrant's presence throughout Europe.

      Aon Services Group addresses the highly specialized  product  development,
consulting and  administrative  risk management  needs of  professional  groups,
service   businesses,   governments,   healthcare   providers   and   commercial
organizations.  It also provides underwriting management skills, claims and risk
management  expertise,  and  third-party  administration  services to  insurance
companies.  Aon Services Group operating subsidiaries market and broker both the
primary and reinsurance risks of these programs. For individuals and businesses,
Aon Services Group provides affinity products for professional liability,  life,
disability  income and personal lines. The acquisition of The Minet Group by the
Registrant  augmented Aon Services Group's already strong expertise in wholesale
brokerage and  professional  liability  programs.  The 1998  acquisition of Auto
Insurance  Specialists,  Inc., an insurance  broker  specializing  in automobile
insurance  coverages,  gives Aon Services  Group a significant  presence in that
market with opportunities for wide geographic application.

      Aon's reinsurance  brokerage  activities are organized under Aon Re in the
United States and AGL in the United Kingdom.  Aon Re is the largest  reinsurance
broker in the world, offering  reinsurance,  analytical services and alternative
risk financing  vehicles.  Aon Re serves the alternative market with reinsurance
placement,   alternative  risk  services,   captive   management   services  and
catastrophe information  forecasting.  AGL is a London-based Lloyd's broker that
places  wholesale  and  reinsurance  business  in the London  and  international
markets and serves the needs of a wide range of clients around the world.

      AMO was  established  by Aon in late  1997  and is a leader  in  specialty
underwriting  solutions and  custom-designed  products and services.  Several of
AMO's  specialties   include   entertainment,   public  entities,   professional
liability, workers compensation, and media business and financial institutions.


(2)  CONSULTING

Aon Consulting Worldwide, Inc. ("Aon Consulting")

      Subsidiaries  of Aon Consulting (and the European  benefits  operations of
Aon Holdings) serve the employee  benefit needs of clients around the world. Aon
Consulting is one of the world's largest  integrated human resources  consulting
organizations.  Focusing on the increasing demand for outsourcing solutions, Aon
Consulting  targets emerging  businesses,  IPOs, recent mergers and acquisitions
and corporations that are reengineering staff functions.

      In the United  States,  the  benefits  environment  continues to change as
companies  look for ways to manage their  benefits  costs while  increasing  the
choices offered to their  employees.  Aon Consulting,  with its expertise in all
areas of benefits and  compensation,  and its access to the  Registrant's  other
subsidiaries,   is   well-positioned   to  serve  this  market.  Aon  Consulting
subsidiaries offer services to clients including  organizational analysis and HR
strategic  planning,  recruitment and selection,  benefits design and management
training and development,  job design and competency modeling;  compensation and
reward systems;  human resources compliance and risk management;  and individual
and organizational  change management.  Benefits issues in foreign countries are
becoming  more  complicated,  and Aon  Holdings  and Aon  Consulting  anticipate
increased demand for their services in these markets.


                                     - 3 -
<PAGE>
(3)  INSURANCE UNDERWRITING

      Combined  Insurance Company of America  ("Combined  Insurance");  Combined
Life Insurance  Company of New York  ("CLICNY");  Virginia Surety Company,  Inc.
("VSC");  London General  Insurance Company Limited ("London  General"); and Aon
Warranty Group, Inc. ("Aon  Warranty").

      The Registrant's insurance underwriting  subsidiaries are part of a highly
competitive industry that serves individual consumers in North America,  Europe,
Latin  America  and the  Pacific by  providing  accident  and  health  coverage,
traditional life insurance and extended warranties through distribution networks
most of which are directly owned by the Registrant's subsidiaries.

      The  life  and  accident  and   health  distribution  network  encompasses
primarily   the  agents  of  Combined  Insurance  and  CLICNY  ( which  operates
exclusively  in  the  State  of  New York).  With more than five million policy-
holders,  Combined Insurance has more  individual  accident  policies  in  force
than  any  other United  States  company.  Combined  Insurance, the Registrant's
principal  life  and  accident and health insurer, has a direct sales  force  of
several thousand  career  agents calling on individuals to sell a broad spectrum
of accident and health products and is one of the few companies with agents that
call on customers  every six  months  to  renew  coverage and to sell additional
coverage.  Combined Insurance's  current product portfolio often allows  policy-
holders the option of paying  premiums  monthly  through a pre-authorized  check
mechanism. Those policyholders are still called on by an agent to add additional
coverage. Combined  Insurance offers a wide range of accident-only and sickness-
only insurance  products,  including short-term disability, cancer aid, Medicare
supplement,  disability  income and long-term  care  coverage.  Most of Combined
Insurance's  products are primarily  fixed  indemnity  obligations,  thereby not
subject to escalating  medical  costs.  Combined  Insurance  offers a simplified
accident  and  sickness   long-term   disability  policy.  In  addition  to  its
traditional  business,  Combined Insurance has expanded its product distribution
through payroll deduction,  worksite marketing  programs.  Combined  Insurance's
business is  conducted  by the  Registrant's  operations  in the United  States,
Canada, Latin America, Europe and Asia Pacific.  Combined  Insurance and  CLICNY
market  whole  life products through  direct sales career agents in  the  United
States.

      The  Registrant's  extended  warranty and  specialty  insurance  business,
conducted  by VSC subsidiaries in North America,  South America and Asia Pacific
and London General  in  Europe,  is  composed  primarily  of  extended  warranty
insurance   products,  professional  liability   insurance  coverages,  workers'
compensation  and  specialty  financial institution coverages.  VSC  and  London
General  are  among  the  world's  largest  underwriters  of  consumer  extended
warranties.  The  automobile  warranty  products  are sold in the United States,
Canada,  the United  Kingdom, Ireland, France, The Netherlands,  Belgium, Spain,
Argentina,  Brazil,  Australia  and  Japan.   Aon  Warranty  Group  handles  the
administration of certain  extended warranty products on automobiles, electronic
goods, personal computers and appliances.  It serves manufacturers, distributors
and  retailers  of  major worldwide consumer product and financial institutions,
associations and affinity groups in North America and in Europe.


                                     - 4 -
<PAGE>
(4)  DISCONTINUED OPERATIONS

      The  Registrant  hereby  incorporates  by reference note 4 of the Notes to
Consolidated Financial Statements on page 35 of the Annual Report.


LICENSING AND REGULATION

      Regulatory  authorities  in the states or countries in which the operating
subsidiaries  of Aon Group  conduct  business may require  individual or company
licensing  to act as  brokers,  agents,  third  party  administrators,  managing
general agents,  reinsurance intermediaries or adjusters. Under the laws of most
states  in  the  United  States  and  in  most  foreign  countries,   regulatory
authorities have relatively broad discretion with respect to granting,  renewing
and revoking  brokers' and agents' licenses to transact business in the state or
country.  The manner of operating in  particular  states and  countries may vary
according to the  licensing  requirements  of the  particular  state or country,
which may  require,  among  other  things,  that a firm  operate in the state or
country through a local corporation. In a few states and countries, licenses are
issued only to individual residents or locally-owned  business entities. In such
cases,  Aon Group  subsidiaries  have  arrangements  with  residents or business
entities licensed to act in the state or country.

      Insurance   companies  must  comply  with  laws  and  regulations  of  the
jurisdictions in which they do business. These laws and regulations are designed
to ensure  financial  solvency of  insurance  companies  and to require fair and
adequate  service and  treatment  for  policyholders.  They are  enforced by the
states in the United States, by industry  self-regulating agencies in the United
Kingdom,  and by various  regulatory  agencies  in other  countries  through the
granting  and  revoking  of  licenses  to  do  business,  licensing  of  agents,
monitoring  of  trade  practices,  policy  form  approval,  minimum  loss  ratio
requirements,  limits on premium and commission  rates,  and minimum reserve and
capital requirements. Compliance is monitored by the state insurance departments
through periodic regulatory reporting procedures and periodic examinations.  The
quarterly and annual  financial  reports to the  regulators in the United States
utilize statutory  accounting  principles which are different from the generally
accepted  accounting  principles used in  stockholders'  reports.  The statutory
accounting  principles,  in keeping with the intent to assure the  protection of
policyholders  are based, in general,  on a liquidation  concept while generally
accepted accounting principles are based on a going-concern concept.

      The state insurance  regulators are members of the National Association of
Insurance  Commissioners  ("NAIC"). This Association seeks to promote uniformity
of, and to enhance the state  regulation  of,  insurance.  Both the NAIC and the
individual  states continue to focus on the solvency of insurance  companies and
their  conduct  in the  market  place.  This focus is  reflected  in  additional
regulatory  oversight by the states and emphasis on the enactment or adoption of
a series of NAIC model laws and regulations  designed to promote  solvency.  Any
increase in any solvency-related oversight by the states is not expected to have
any significant impact on the insurance business of the Registrant.

      Several  years ago, the NAIC  developed a formula for  analyzing  insurers
called  risk-based  capital  ("RBC").  RBC is  intended to  establish  "minimum"
capital  threshold  levels  that  vary  with  the  size  and mix of a  company's
business.  It is designed to identify companies with the capital levels that may
require  regulatory  attention.  RBC does not have any significant impact on the
insurance business of the Registrant.

      The state  insurance  holding  company  laws  require  prior notice to and
approval of the domestic state insurance department of intracorporate  transfers
of assets  within  the  holding  company  structure,  including  the  payment of
dividends by insurance company  subsidiaries.  In addition,  the premium finance
loans by Cananwill, Inc., an indirect wholly-owned subsidiary of the Registrant,
are subject to one or more of truth-in-lending and credit regulations, insurance
premium finance acts,  retail  installment sales acts and other similar consumer
protection  legislation.  Failure to comply  with such laws or  regulations  can
result in the temporary  suspension or permanent  loss of the right to engage in
business in a particular jurisdiction as well as other penalties.

      Recent federal and state laws and proposals  mandating  specific practices
by medical insurers and the health care industry will not, because of the nature
of  the  business  of  the  Registrant's  subsidiaries,  materially  affect  the
Registrant. Numerous states have had legislation introduced to reform the health
care  system and such  legislation  has passed in  several  states.  While it is
impossible  to forecast  the precise  nature of future  federal and state health
care changes,  the  Registrant  does not expect a major impact on its operations
because  of the  supplemental  nature  of

                                     - 5 -
<PAGE>

most of the  policies  issued by its  insurance  subsidiaries  and  because  the
coverages  are  primarily  purchased  to provide,  on a  fixed-indemnity  basis,
protection against loss-of-time or disability benefits.  Congress has passed the
Financial  Services  Modernization  Act  commonly  known as S 900 or the  Gramm,
Leach,  Bliley Act. While S 900 makes substantial  changes in allowing financial
organizations  to  diversify,  the Registrant does not  believe the enactment of
S 900 will have a material effect on the business of its insurance institutions.


CLIENTELE

      No significant part of the Registrant's or its  subsidiaries'  business is
dependent upon a single client or on a few clients, the loss of any one of which
would have a material adverse effect on the Registrant.


EMPLOYEES

      The Registrant's  subsidiaries had  approximately  50,000 employees at the
end of 1999 of whom  approximately  42,000 are salaried and hourly employees and
the remaining  8,000 are sales  representatives  who are  generally  compensated
wholly or primarily by commission.


ITEM 2.  PROPERTIES.

      The  Registrant's  subsidiaries  own and occupy  office  buildings  in six
states and certain  foreign  countries,  and lease office space elsewhere in the
United  States and in various  foreign  cities.  Loss of the use of any owned or
leased property, while potentially disruptive,  would have no material impact on
the Registrant.


                                     - 6 -
<PAGE>
ITEM 3.  LEGAL PROCEEDINGS.

      The Registrant  hereby  incorporates  by reference note 13 of the Notes to
Consolidated Financial Statements on pages 47 and 48 of the Annual Report.

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

      None.

EXECUTIVE OFFICERS OF THE REGISTRANT

      Executive officers of the Registrant are regularly elected by its Board of
Directors at the annual meeting of the Board which is held following each annual
meeting of the  stockholders  of the Registrant.  The executive  officers of the
Registrant  were elected to their  current  positions on April 16, 1999 to serve
until the meeting of the Board  following the annual meeting of  stockholders on
April 18, 2000. Ages shown are as of December 31, 1999.

      For information concerning certain directors and executive officers of the
Registrant,  see item 10 below. As of March 24, 2000, the following  individuals
are also executive officers of the Registrant as defined in Rule 16a-1(f):

                                 HAS
                             CONTINUOUSLY
                             SERVED AS AN
                               OFFICER
                           OF REGISTRANT OR
      NAME, AGE, AND        ONE OR MORE OF
      CURRENT OFFICE       ITS SUBSIDIARIES          BUSINESS EXPERIENCE
  OR PRINCIPAL POSITION         SINCE                   PAST 5 YEARS
  ---------------------         -----                   ------------

Harvey N. Medvin, 63             1972      Mr.  Medvin   became  Vice  President
Executive Vice President and               and Chief  Financial  Officer of  the
Chief Financial Officer                    Registrant in 1982 and was elected to
                                           his  current  position  in  1987.  He
                                           also serves as a Director or  Officer
                                           of   certain   of   the  Registrant's
                                           subsidiaries.

Daniel T. Cox, 53                1986      Mr. Cox was  elected  to his  current
Executive Vice President                   position in 1991  and, prior to their
                                           sale in 1996, had served as  Chairman
                                           and    Chief   Executive  Officer  of
                                           certain of  the  Registrant's  under-
                                           writing  subsidiaries.   Mr. Cox  has
                                           headed  the   Registrant's   benefits
                                           consulting  operation  since 1987. He
                                           also serves as  Director  or  Officer
                                           of  certain  of   the    Registrant's
                                           subsidiaries.

Michael A. Conway, 52            1990      Mr.  Conway  was  Vice  President  of
Senior Vice President and                  Combined   Insurance   from  1980  to
Senior Investment Officer                  1984.   Following  other  employment,
                                           Mr. Conway  rejoined  the  Registrant
                                           in 1990 as Senior Vice  President  of
                                           Combined Insurance  and  was  elected
                                           to  his current position in 1991.  He
                                           also  serves as  Director or  Officer
                                           of  certain   of   the   Registrant's
                                           subsidiaries.


                                     - 7 -
<PAGE>
                                     PART II


ITEM 5. MARKET FOR THE  REGISTRANT'S  COMMON STOCK AND RELATED  SECURITY  HOLDER
MATTERS.

      The  Registrant's  $1.00 par value  common  shares  ("Common  Shares") are
traded on the New York,  Chicago  and London  stock  exchanges.  The  Registrant
hereby  incorporates  by  reference  the  "Dividends  paid per share" and "Price
range" data on page 52 of the Annual Report.

      The  Registrant had  approximately  13,300 holders of record of its Common
Shares as of February 23, 2000.

      The  Registrant  hereby  incorporates  by reference note 9 of the Notes to
Consolidated Financial Statements on page 40 of the Annual Report.


ITEM 6.  SELECTED FINANCIAL DATA.

      The Registrant  hereby  incorporates by reference the "Selected  Financial
Data" table on page 52 of the Annual Report.


ITEM  7.  MANAGEMENT'S  DISCUSSION  AND  ANALYSIS  OF  FINANCIAL  CONDITION  AND
RESULTS OF OPERATIONS.

      The Registrant hereby incorporates by reference  "Financial and Operations
Highlights -  Management's  Discussion  and Analysis" on pages 18 through 24 and
"Information  Concerning  Forward-Looking  Statements"  on page 54 of the Annual
Report.


ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

      The Registrant hereby  incorporates by reference "Market Risk Exposure" on
pages 23 and 24 of the Annual Report.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

      The Registrant hereby incorporates by reference the following  statements,
notes and data from the Annual Report.
                                                                     Page(s)
                                                                     -------
            Consolidated Financial Statements .....................  25 - 29
            Notes to Consolidated Financial Statements ............  30 - 50
            Report of Ernst & Young LLP, Independent Auditors .....     51
            Quarterly Financial Data ..............................     53


ITEM  9.  CHANGES  IN  AND  DISAGREEMENT  WITH  ACCOUNTANTS  ON  ACCOUNTING  AND
FINANCIAL DISCLOSURE.

      Not Applicable.


                                     - 8 -
<PAGE>
                                    PART III


ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

      The Registrant  hereby  incorporates by reference the information on pages
3, 6 and 7 of the Proxy Statement For The Annual Meeting of the  Stockholders on
April 18, 2000, of the Registrant ("Proxy  Statement")  concerning the following
Directors of the Registrant, each of whom also serves as an executive officer of
the  Registrant  as  defined  in Rule  16a-1(f):  Patrick  G.  Ryan,  Michael D.
O'Halleran and Raymond I. Skilling.  Information concerning additional executive
officers of the  Registrant  is contained in Part I hereof,  pursuant to General
Instruction  G(3) and  Instruction  3 to Item  401(b)  of  Regulation  S-K.  The
Registrant  also hereby  incorporates  by reference the  information on pages 10
through 12 of the Proxy Statement.


ITEM 11.  EXECUTIVE COMPENSATION.

      The Registrant hereby  incorporates by reference the information under the
headings "Executive  Compensation,"  "Aggregated Option Exercises in Last Fiscal
Year and Fiscal Year-End Option Values," "Option Grants in 1999 Fiscal Year" and
"Pension Plan Table" on pages 14 through 17 of the Proxy Statement.


ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

      The Registrant  hereby  incorporates by reference the share ownership data
contained on pages 2, 9 and 10 of the Proxy Statement.


ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

      The Registrant hereby  incorporates by reference the information under the
heading "Transactions With Management" on page 21 of the Proxy Statement.


                                     - 9 -
<PAGE>
                                     PART IV


ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.

(a) (1) and (2). The  Registrant has  incorporated  by reference from the Annual
Report  (see Item 8) the  following  consolidated  financial  statements  of the
Registrant and subsidiaries:

<TABLE>
<CAPTION>
                                                                                            Annual
                                                                                            Report
                                                                                            Page(s)
                                                                                            -------

<S>                                                                                            <C>
Consolidated Statements of Income - Years Ended December 31, 1999, 1998 and 1997               25

Consolidated Statements of Financial Position - As of December 31, 1999 and 1998             26-27

Consolidated Statements of Stockholders' Equity - Years Ended December 31, 1999,
  1998 and 1997                                                                                28

Consolidated  Statements of Cash Flows - Years Ended December 31, 1999, 1998 and
  1997                                                                                         29

Notes to Consolidated Financial Statements                                                   30-50

Report of Ernst & Young LLP, Independent Auditors                                              51
</TABLE>

Financial  statement  schedules of the Registrant and consolidated  subsidiaries
not included in the Annual Report but filed herewith:
            Consolidated Financial Statement Schedules -

                                                                       Schedule
                                                                       --------
      Condensed Financial Information of Registrant                        I
      Valuation and Qualifying Accounts                                   II


All other schedules  for Aon Corporation  and  Subsidiaries  have  been  omitted
because the required information is not present in amounts sufficient to require
submission of the schedules or because the  information  required is included in
the   respective   financial   statements  or  notes   thereto.   The  following
supplementary  schedules have been provided for Aon Corporation and Subsidiaries
as they relate to the insurance underwriting operations:

                                                                       Schedule
                                                                       --------
      Summary of Investments Other than Investments in Related Parties    II.1
      Reinsurance                                                         II.2
      Supplementary Insurance Information                                 II.3


(A)(3).  EXHIBITS

      (a)   Second  Restated  Certificate of  Incorporation  of the Registrant -
            incorporated by reference to Exhibit 3(a) to the Registrant's Annual
            Report to the  Securities  and Exchange  Commission on Form 10-K for
            the year ended December 31, 1991 (the "1991 Form 10-K").

      (b)   Certificate  of  Amendment  of  the  Registrant's   Second  Restated
            Certificate of  Incorporation - incorporated by reference to Exhibit
            3 to the Registrant's  Quarterly Report on Form 10-Q for the quarter
            ended March 31, 1994 (the "First Quarter 1994 Form 10Q").

      (c)   Bylaws of the Registrant - incorporated  by reference to Exhibit (d)
            to the  Registrant's  Annual Report to the  Securities  and Exchange
            Commission  on Form 10-K for the year ended  December  31, 1982 (the
            "1982 Form 10-K").

                                     - 10 -
<PAGE>
      (d)   Indenture  dated  September  15,  1992  between the  Registrant  and
            Continental   Bank   Corporation  (now  known  as  Bank  of  America
            Illinois), as Trustee - incorporated by reference to Exhibit 4(a) to
            the  Registrant's  Current  Report on Form 8-K dated  September  23,
            1992.

      (e)   Resolutions  establishing  terms of 6.875%  Notes Due 1999 and 7.40%
            Notes Due 2002 -  incorporated  by reference to Exhibits 4(d) to the
            Registrant's Annual Report to the Securities and Exchange Commission
            on Form 10-K for the year ended  December  31,  1992 (the "1992 Form
            10-K").

      (f)   Resolutions establishing the terms of 6.70% Notes Due 2003 and 6.30%
            Notes Due 2004  incorporated  by reference to Exhibits 4(c) and 4(d)
            of the  Registrant's  Annual Report to the  Securities  and Exchange
            Commission  on Form 10-K for the year ended  December  31, 1993 (the
            "1993 Form 10-K").

      (g)   Resolutions establishing the terms of the 6.90 % Notes Due 2004.

      (h)   Junior  Subordinated  Indenture dated as of January 13, 1997 between
            the  Registrant  and The Bank of New York, as trustee - incorporated
            by reference to Exhibit 4.1 of the  Registrant's  Amendment No. 1 to
            Registration  Statement  on Form S-4 No.  333-21237  dated March 27,
            1997 (the "Capital Securities Registration").

      (i)   First  Supplemental  Indenture  dated as of January 13, 1997 between
            the  Registrant  and the Bank of New York, as trustee - incorporated
            by reference to Exhibit 4.2 of the Capital Securities Registration.

      (j)   Certificate of Trust of Aon Capital A - incorporated by reference to
            Exhibit 4.3 of the Capital Securities Registration.

      (k)   Amended and  Restated  Trust  Agreement of Aon Capital A dated as of
            January 13, 1997 among the Registrant, as Depositor, The Bank of New
            York,  as  Property  Trustee,  The Bank of New York  (Delaware),  as
            Delaware Trustee, the Administrative  Trustees named therein and the
            holders, from time to time, of the Capital Securities - incorporated
            by reference to Exhibit 4.5 of the Capital Securities Registration.

      (l)   Capital Securities  Guarantee Agreement dated as of January 13, 1997
            between  the  Registrant  and the  Bank of New  York,  as  guarantee
            trustee -  incorporated  by  reference to Exhibit 4.8 of the Capital
            Securities Registration.

      (m)   Capital Securities  Exchange and Registration Rights Agreement dated
            as of January  13,  1997  among the  Registrant,  Aon  Capital A and
            Morgan  Stanley  & Co.  Incorporated  and  Goldman,  Sachs  & Co.  -
            incorporated by reference to Exhibit 4.10 of the Capital  Securities
            Registration.

      (n)   Debenture  Exchange and  Registration  Rights  Agreement dated as of
            January  13,  1997 among the  Registrant,  Aon  Capital A and Morgan
            Stanley & Co.  Incorporated and Goldman,  Sachs & Co. - incorporated
            by reference to Exhibit 4.11 of the Capital Securities Registration.

      (o)   Guarantee  Exchange and  Registration  Rights  Agreement dated as of
            January  13,  1997 among the  Registrant,  Aon  Capital A and Morgan
            Stanley & Co.  Incorporated and Goldman,  Sachs & Co. - incorporated
            by reference to Exhibit 4.12 of the Capital Securities Registration.

      (p)   Certificate of Designation for the Registrant's  Series C Cumulative
            Preferred  Stock -  incorporated  by reference to Exhibit 4.1 to the
            Registrant's Current Report on Form 8-K dated February 9, 1994.

      (q)   Registration  Rights Agreement dated November 2, 1992 by and between
            the  Registrant  and Frank B. Hall & Co.,  Inc.  -  incorporated  by
            reference to Exhibit 4(c) to the Third Quarter 1992 Form 10-Q.

                                     - 11 -
<PAGE>
      (r)   Registration  rights  agreement  by and  among  the  Registrant  and
            certain affiliates of Ryan Insurance Group, Inc.  (including Patrick
            G. Ryan and  Andrew J.  McKenna)  -  incorporated  by  reference  to
            Exhibit (f) to the 1982 Form 10-K.

      (s)   Aon Corporation Outside Director Deferred Compensation  Agreement by
            and among the  Registrant  and  Registrant's  directors  who are not
            salaried employees of Registrant or Registrant's affiliates.

      (t)   Amendment  and Waiver  Agreement  dated as of November 4, 1991 among
            the  Registrant  and each of  Patrick G. Ryan,  Shirley  Ryan,  Ryan
            Enterprises  Corporation  and  Harvey N.  Medvin -  incorporated  by
            reference to Exhibit 10(j) to the 1991 Form 10-K.

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

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

      (w)   Aon  Corporation  1994 Amended and Restated  Outside  Director Stock
            Award Plan - incorporated by reference to Exhibit 10(b) to the First
            Quarter 1994 Form 10-Q.

      (x)   Annual Report to  Stockholders  of the Registrant for the year ended
            December  31,  1999 (for  information,  and not to be deemed  filed,
            except for those  portions  specifically  incorporated  by reference
            herein).

      (y)   List of Subsidiaries of the Registrant.

      (z)   Consent of Ernst & Young LLP to the  incorporation by reference into
            Aon's Annual Report on Form 10-K of its report  included in the 1999
            Annual Report to Stockholders and into Aon's Registration  Statement
            Nos. 33-27984, 33-42575, 33-59037, 333-21237,  333-50607,  333-55773
            and 333-78723.

      (aa)  Annual Report to the Securities and Exchange Commission on Form 11-K
            for the Aon Savings  Plan for the year ended  December 31, 1999 - to
            be filed by amendment as provided in Rule 15d- 21(b).

      (ab)  Executive Compensation Plans and Arrangements:

            (A)   Aon Stock Option Plan (as amended and restated through 1997) -
                  incorporated   by   reference   to   Exhibit  10  (a)  to  the
                  Registrant's  Quarterly  Report to the Securities and Exchange
                  Commission  on Form 10-Q for the Quarter  ended March 31, 1997
                  (the "First Quarter 1997 Form 10-Q").

            (B)   First  Amendment  to the Aon Stock  Option Plan as Amended and
                  Restated  Through 1997-  incorporated  by reference to Exhibit
                  10(a) to the  Registrant's  Quarterly Report to the Securities
                  and  Exchange  Commission  on Form 10-Q for the quarter  ended
                  March 31, 1999 (the "First Quarter 1999 Form 10-Q").

            (C)   Aon Stock Award Plan (as amended and restated  through 1997) -
                  incorporated  by  reference  to  Exhibit  10(b)  to the  First
                  Quarter 1997 Form 10-Q.

            (D)   First  Amendment  to the Aon Stock  Award Plan as Amended  and
                  Restated  Through 1997-  incorporated  by reference to Exhibit
                  10(b) to the First Quarter 1999 Form 10-Q.


                                     - 12 -
<PAGE>
            (E)   Aon  Corporation  1995 Senior Officer  Incentive  Compensation
                  Plan  incorporated  by  reference  to  Exhibit  10(p)  to  the
                  Registrant's  Annual  Report to the  Securities  and  Exchange
                  Commission  on Form 10-K for the year ended  December 31, 1995
                  (the "1995 Form 10-K").

            (F)   Aon Deferred  Compensation Plan and First Amendment to the Aon
                  Deferred  Compensation  Plan -  incorporated  by  reference to
                  Exhibit 10(q) of the 1995 Form 10-K.

            (G)   1999 Aon Deferred Compensation Plan.

            (H)   Employment  Agreement  dated  June 1,  1993 by and  among  the
                  Registrant, Aon Risk Services, Inc. and Michael D. O'Halleran,
                  incorporated by reference to Exhibit 10(p) to the Registrant's
                  Annual  Report to the  Securities  and Exchange  Commission on
                  Form 10-K for the year ended December 31, 1998.

            (I)   Aon Severance Plan -  incorporated  by reference to Exhibit 10
                  to the  Registrant's  Quarterly  Report to the  Securities and
                  Exchange  Commission  and Form 10-Q for the quarter ended June
                  30, 1997.

      (ac)  Asset Purchase  Agreement dated July 24, 1992 between the Registrant
            and Frank B. Hall & Co. Inc. - incorporated  by reference to Exhibit
            10(c) to the  Registrant's  Quarterly  Report  on Form 10- Q for the
            period ended June 30, 1992.

      (ad)  Stock  Purchase  Agreement  by and  among the  Registrant,  Combined
            Insurance Company of America,  Union Fidelity Life Insurance Company
            and General  Electric Capital  Corporation  dated as of November 11,
            1995 -  incorporated  by reference to Exhibit 10(s) of the 1995 Form
            10-K.

      (ae)  Stock  Purchase  Agreement  by and  among the  Registrant;  Combined
            Insurance  Company  of  America;   The  Life  Insurance  Company  of
            Virginia; Forth Financial Resources,  Ltd.; Newco Properties,  Inc.;
            and General  Electric Capital  Corporation  dated as of December 22,
            1995 -  incorporated  by reference to Exhibit 10(t) of the 1995 Form
            10-K.

      (af)  Agreement  and  Plan of  Merger  among  the  Registrant;  Subsidiary
            Corporation, Inc. ("Purchaser");  and Alexander & Alexander Services
            Inc.  ("A&A")  dated  as of  December  11,  1996 -  incorporated  by
            reference  to  Exhibit  (c)(1)  of  the  Registrant's  Tender  Offer
            Statement  on  Schedule  14D-1  filed  by the  Registrant  with  the
            Securities and Exchange Commission ("SEC") on December 16, 1996 (the
            "Schedule 14D-1").

      (ag)  First Amendment to Agreement and Plan of Merger, dated as of January
            7, 1997,  among the Registrant,  Purchaser and A&A - incorporated by
            reference  to  Exhibit  (c)(3) to the  Schedule  14D-1  filed by the
            Registrant with the SEC on January 9, 1997.

(b)   Reports on Form 8-K.

            The Registrant  filed no Current Reports on Form 8-K during the last
            quarter of the Registrant's year ended December 31, 1999.


                                     - 13 -
<PAGE>
                                   SIGNATURES


      Pursuant  to the  requirements  of Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the  undersigned,  thereunto duly  authorized,  on the 17th day of
March, 2000.

                                                Aon Corporation



                                                By:  /s/ PATRICK G. RYAN
                                                     -------------------
                                                     Patrick G. Ryan, Chairman
                                                     and Chief Executive Officer


      Pursuant to the requirements of the Securities  Exchange Act of 1934, this
Report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant and in the capacities and on the dates indicated.

         SIGNATURE                    TITLE                      DATE
         ---------                    -----                      ----


     /s/ PATRICK G. RYAN         Chairman, Chief Executive  March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------        Officer and Director
      Patrick G. Ryan          (Principal Executive Officer)


     /s/DANIEL T. CARROLL            Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Daniel T. Carroll


    /s/FRANKLIN A. COLE              Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Franklin A. Cole


   /s/EDGAR D. JANNOTTA              Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Edgar D. Jannotta


    /s/LESTER B. KNIGHT              Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Lester B. Knight


     /s/PERRY J. LEWIS               Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
      Perry J. Lewis


   /s/ANDREW J. McKENNA              Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Andrew J. McKenna


    /s/NEWTON N. MINOW               Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
      Newton N. Minow



                                     - 14 -
<PAGE>

         SIGNATURE                    TITLE                      DATE
         ---------                    -----                      ----


  /s/RICHARD C. NOTEBAERT            Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
   Richard C. Notebaert


 /s/MICHAEL D. O'HALLERAN            Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
   Michael D. O'Halleran



   /s/DONALD S. PERKINS              Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
     Donald S. Perkins


  /s/JOHN W. ROGERS, JR.             Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
    John W. Rogers, Jr.


   /s/GEORGE A. SCHAEFER             Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
    George A. Schaefer


  /s/RAYMOND I. SKILLING             Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
    Raymond I. Skilling


     /s/FRED L. TURNER               Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
      Fred L. Turner


    /s/ARNOLD R. WEBER               Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
      Arnold R. Weber


     /s/CAROLYN Y. WOO               Director               March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------
      Carolyn Y. Woo


    /s/HARVEY N. MEDVIN      Executive Vice President       March 17, 2000
- - - - - - - - - - - - - - - - - ----------------------------   and Chief Financial
     Harvey N. Medvin               Officer
                            (Principal Financial and
                               Accounting Officer)


                                     - 15 -
<PAGE>
<TABLE>
<CAPTION>
                                                                            SCHEDULE I

                                   Aon Corporation
                                  (Parent Company)
                     CONDENSED STATEMENTS OF FINANCIAL POSITION


                                                                   As of December 31
                                                               ------------------------
 (millions)                                                       1999         1998
                                                               -----------  -----------

 ASSETS
<S>                                                               <C>          <C>
       Investments in subsidiaries ........................       $ 5,585      $ 5,305
       Notes receivable - subsidiaries ....................           447          239
       Cash and cash equivalents ..........................            17            6
       Other assets .......................................           123           84
                                                               -----------  -----------
           Total Assets ...................................       $ 6,172      $ 5,634
                                                               ===========  ===========

 LIABILITIES AND STOCKHOLDERS' EQUITY
       LIABILITIES
       Short-term borrowings ..............................       $   823      $   436
       6.3% long-term debt securities .....................           100          100
       7.4% long-term debt securities .....................           100          100
       6.875% long-term debt securities....................             -          100
       6.9% long-term debt securities .....................           250            -
       6.7% long-term debt securities .....................           150          150
       Subordinated debt ..................................           800          800
       Notes payable - subsidiaries .......................           622          588
       Notes payable - other ..............................            70           70
       Debt guarantee of employee stock ownership plan ....             -           17
       Accrued expenses and other liabilities .............           156          206
                                                               -----------  -----------
           TOTAL LIABILITIES ..............................         3,071        2,567
                                                               -----------  -----------

       Redeemable Preferred Stock ........................             50           50

       STOCKHOLDERS' EQUITY
       Common stock .......................................           259          172
       Paid-in additional capital .........................           525          450
       Accumulated other comprehensive loss ...............          (309)        (116)
       Retained earnings ..................................         2,905        2,782
       Less treasury stock at cost ........................           (90)         (58)
       Less deferred compensation .........................          (239)        (213)
                                                               -----------  -----------
           TOTAL STOCKHOLDERS' EQUITY .....................         3,051        3,017
                                                               -----------  -----------
           TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY .....       $ 6,172      $ 5,634
                                                               ===========  ===========
 See notes to condensed financial statements.
</TABLE>

                                     - 16 -
<PAGE>
<TABLE>
<CAPTION>
                                                                          SCHEDULE I
                                                                          (Continued)

                                           Aon Corporation
                                          (Parent Company)
                                   CONDENSED STATEMENTS OF INCOME


                                                                 Years Ended December 31
                                                               ----------------------------
 (millions)                                                      1999      1998      1997
                                                               --------  --------  --------

 REVENUE
<S>                                                              <C>       <C>       <C>
       Dividends from subsidiaries ........................      $ 467     $ 351     $ 180
       Other investment income ............................         20        69        51
                                                               --------  --------  --------
            TOTAL REVENUE .................................        487       420       231
                                                               --------  --------  --------


 EXPENSES
       Operating and administrative .......................         13        20         6
       Interest - subsidiaries ............................         96        94        85
       Interest - other ...................................         85        76        62
                                                               --------  --------  --------
            TOTAL EXPENSES ................................        194       190       153
                                                               --------  --------  --------


 INCOME BEFORE INCOME TAXES AND EQUITY (DEFICIT) IN
      UNDISTRIBUTED INCOME OF SUBSIDIARIES ................        293       230        78
       Income tax benefit .................................         70        54        43
                                                               --------  --------  --------
                                                                   363       284       121
 EQUITY (DEFICIT) IN UNDISTRIBUTED INCOME OF SUBSIDIARIES..        (11)      257       178
                                                               --------  --------  --------
       NET INCOME .........................................      $ 352     $ 541     $ 299
                                                               ========  ========  ========
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------------------------
 See notes to condensed financial statements.
</TABLE>


                                     - 17 -
<PAGE>
<TABLE>
<CAPTION>
                                                                               SCHEDULE I
                                                                               (Continued)

                                        Aon Corporation
                                        (Parent Company)
                               CONDENSED STATEMENTS OF CASH FLOWS


                                                                       Years Ended December 31
                                                                    ------------------------------
 (millions)                                                           1999      1998       1997
                                                                    --------  ---------  ---------


<S>                                                                   <C>        <C>        <C>
 CASH FLOWS FROM OPERATING ACTIVITIES ............................  $   287    $   445    $   124

 CASH FLOWS FROM INVESTING ACTIVITIES:
       Investments in subsidiaries ...............................     (363)       (93)    (1,355)
       Notes receivables from subsidiaries .......................     (208)       (16)      (135)
                                                                    --------  ---------  ---------
            CASH USED BY INVESTING ACTIVITIES ....................     (571)      (109)    (1,490)
                                                                    --------  ---------  ---------

 CASH FLOWS FROM FINANCING ACTIVITIES:
       Treasury stock transactions - net .........................      (66)       (18)        21
       Issuance (repayment) of short-term borrowings - net .......      387       (328)       542
       Issuance of  company-obligated mandatorily redeemable
               preferred capital securities of subsidiary trust ..        -          -        800
       Issuance of notes payable and long-term debt ..............      284        200        114
       Repayment of long-term debt ...............................     (100)         -          -
       Retirement of preferred stock .............................        -          -       (136)
       Cash dividends to stockholders ............................     (210)      (194)      (182)
                                                                    --------  ---------  ---------
            CASH PROVIDED (USED) BY FINANCING ACTIVITIES .........      295       (340)     1,159
                                                                    --------  ---------  ---------


 INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS ................       11         (4)      (207)
 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR ..................        6         10        217
                                                                    --------  ---------  ---------
 CASH AND CASH EQUIVALENTS AT END OF YEAR ........................  $    17    $     6    $    10
                                                                    ========  =========  =========
 See notes to condensed financial statements.
</TABLE>


                                     - 18 -
<PAGE>
                                                                      SCHEDULE I
                                                                     (Continued)

                                 Aon Corporation
                                (Parent Company)
                     NOTES TO CONDENSED FINANCIAL STATEMENTS


(1)   See notes to consolidated  financial statements  incorporated by reference
      from the Annual Report.

(2)   Generally,  the net assets of Aon's insurance  subsidiaries  available for
      transfer  to the  parent  company  are  limited  to the  amounts  that the
      insurance  subsidiaries'  statutory  net assets exceed  minimum  statutory
      capital  requirements;  however,  payments of the amounts as  dividends in
      excess  of  $170  million  may  be  subject  to  approval  by   regulatory
      authorities.

(3)   Subsidiary Guarantees
      ---------------------
      In 1998,  Aon  guaranteed  a committed  bank credit  facility  under which
      certain  European  subsidiaries  can  borrow  up to EUR  400  million.  At
      December  31,  1999,   loans  of  EUR  347  million  ($351  million)  were
      outstanding under this facility.

      An indirect  wholly-owned  subsidiary of Aon  Corporation  manages various
      investment  portfolios,  totaling $297  million at December 31, 1999, held
      in a collateral trust for the benefit of certain unaffiliated entities and
      is obligated to produce specified investment returns for those portfolios.
      Aon  Corporation  has  unconditionally  guaranteed the obligations of this
      subsidiary.

(4)   During 1998, Aon Corporation (Parent Company) reclassified $523 million of
      notes  receivables-subsidiaries  to investments in subsidiaries related to
      its brokerage operations.


                                     - 19 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                                         SCHEDULE II
                                               Aon CORPORATION and SUBSIDIARIES
                                               VALUATION AND QUALIFYING ACCOUNTS
                                        Years Ended December 31, 1999, 1998 and 1997


 (MILLIONS)                                                        ADDITIONS
                                                          ----------------------------
                                                                           CHARGED/
                                            BALANCE AT     CHARGED TO     (CREDITED)                      BALANCE
                                             BEGINNING      COST AND       TO OTHER      DEDUCTIONS       AT END
 DESCRIPTION                                  OF YEAR       EXPENSES       ACCOUNTS          (1)          OF YEAR
- - - - - - - - - - - - - - - - - --------------------------------------------------------  -------------  -------------  -------------  -------------
<S>                                                 <C>            <C>           <C>             <C>            <C>
 YEAR ENDED DECEMBER 31, 1999
 ----------------------------
   Reserve for losses  (2)
   (deducted from other long-term investments)      $ 9            $ -           $ (9)           $ -            $ -

   Allowance for doubtful accounts (3)
   (deducted from insurance brokerage
        and consulting receivables)                  93             12             (3)           (14)            88

   Allowance for doubtful accounts
   (deducted from premiums and other)                 6              1              -             (1)             6


 YEAR ENDED DECEMBER 31, 1998
 ----------------------------
   Reserve for losses (2)
   (deducted from other long-term investments)      $ 9            $ -            $ -            $ -            $ 9

   Allowance for doubtful accounts (3)
   (deducted from insurance brokerage
        and consulting receivables)                  81             20             (5)            (3)            93

   Allowance for doubtful accounts
   (deducted from premiums and other)                 5              1              -              -              6


 YEAR ENDED DECEMBER 31, 1997
 ----------------------------
   Reserve for losses (2)
   (deducted from other long-term investments)      $ 5            $ -            $ 4            $ -            $ 9

   Allowance for doubtful accounts (3)
   (deducted from insurance brokerage
        and consulting receivables)                  60              9             27            (15)            81

   Allowance for doubtful accounts
   (deducted from premiums and other)                 3              2              -              -              5


<FN>
(1)   Amounts deemed to be uncollectible.
(2)   Amounts shown in additions  charged/(credited) to other accounts represent
      (income) losses on disposals.
(3)   Amounts shown in additions  charged/(credited) to other accounts represent
      reserves related to acquired business and foreign exchange.
</FN>
</TABLE>

                                     - 20 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                 SCHEDULE II.1
                                    Aon Corporation and Subsidiaries
                                 CONSOLIDATED SUMMARY OF INVESTMENTS -
                              OTHER THAN INVESTMENTS IN RELATED PARTIES
                                       AS OF DECEMBER 31, 1999
                                                                                             Amount Shown
                                                                                             in Statement
                                                     Amortized               Fair            of Financial
 (millions)                                          Cost or Cost            Value              Position
                                                     ------------         ------------       ------------

<S>                                                        <C>                  <C>                 <C>
 FIXED MATURITIES - AVAILABLE FOR SALE:
     US government and agencies ...................     $    170             $    160            $    160
     States and political subdivisions ............            8                    7                   7
     Debt securities of foreign governments
          not classified as loans .................          755                  750                 750
     Corporate securities .........................        1,530                1,450               1,450
     Public utilities .............................           47                   45                  45
     Mortgage-backed securities ...................           44                   43                  43
     Other fixed maturities .......................           43                   42                  42
                                                     ------------         ------------       ------------
          TOTAL FIXED MATURITIES ..................        2,597                2,497               2,497
                                                     ------------         ------------       ------------

 EQUITY SECURITIES - AVAILABLE FOR SALE:
     Common stocks:
         Public utilities .........................            2                    1                   1
         Banks, trusts and insurance companies ....          151                  149                 149
         Industrial, miscellaneous and all other ..          125                  103                 103
     Non-redeemable preferred stocks ..............          384                  321                 321
                                                     ------------         ------------       ------------
          TOTAL EQUITY SECURITIES .................          662                  574                 574
                                                     ------------         ------------       ------------

 Mortgage loans on real estate ....................            4 *                                      4 *
 Real estate - net of depreciation ................           10 *                                     10 *
 Policy loans .....................................           65 *                                     65 *
 Other long-term investments ......................          672 *                                    672 *
 Short-term investments ...........................        2,362                                    2,362
                                                     ------------                            ------------
          TOTAL INVESTMENTS .......................     $  6,372                                 $  6,184
                                                     ------------                            ------------

<FN>
* These   investment   categories  are  combined  and  are  shown  as  other
  investments in the Statement of Financial Position.
</FN>
</TABLE>


                                     - 21 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                                     SCHEDULE  II.2

                                                                  Aon Corporation and Subsidiaries
                                                                             REINSURANCE


                                                  Y e a r   E n d e d   D e c e m b e r   3 1 ,   1 9 9 9
                                       --------------------------------------------------------------------------------------
                                                            Ceded to           Assumed                        Percentage of
 (millions)                                 Gross             other          from other                           amount
                                            amount          companies         companies        Net amount     assumed to net
                                       --------------------------------------------------------------------------------------

<S>                                          <C>               <C>                <C>              <C>            <C>
 LIFE INSURANCE IN FORCE ............        $ 14,444          $ 15,902          $  7,567         $  6,109       124%
                                       ===============  ================  ================  ===============  ================

 PREMIUMS
     Life Insurance .................        $    227          $     93          $      2         $    136         2%
     A&H Insurance ..................           1,167               257                91            1,001         9%
     Specialty Property & Casualty ..             860               274                85              671        13%
                                       ---------------  ----------------  ----------------  ---------------  ----------------
       TOTAL PREMIUMS ...............        $  2,254          $    624          $    178         $ 1,808         10%
                                       ===============  ================  ================  ===============  ================



                                                  Y e a r   E n d e d   D e c e m b e r   3 1 ,   1 9 9 8
                                       --------------------------------------------------------------------------------------
                                                            Ceded to           Assumed                        Percentage of
                                            Gross             other          from other                           amount
                                            amount          companies         companies        Net amount     assumed to net
                                       --------------------------------------------------------------------------------------

 LIFE INSURANCE IN FORCE ............        $ 10,653          $  9,813          $  5,510         $  6,350        87%
                                       ===============  ================  ================  ===============  ================

 PREMIUMS
     Life Insurance .................        $    235          $    103          $      7         $    139         5%
     A&H Insurance ..................           1,134               235                46              945         5%
     Specialty Property & Casualty ..             734               241                96              589        16%
                                       ---------------  ----------------  ----------------  ---------------  ----------------
       TOTAL PREMIUMS ...............        $  2,103          $    579          $    149         $  1,673         9%
                                       ===============  ================  ================  ===============  ================



                                                  Y e a r   E n d e d   D e c e m b e r   3 1 ,   1 9 9 7
                                       --------------------------------------------------------------------------------------
                                                            Ceded to           Assumed                        Percentage of
                                            Gross             other          from other                           amount
                                            amount          companies         companies        Net amount     assumed to net
                                       --------------------------------------------------------------------------------------

 LIFE INSURANCE IN FORCE ............        $ 10,438          $ 12,515          $  8,823         $  6,746       131%
                                       ===============  ================  ================  ===============  ================

 PREMIUMS
     Life Insurance .................        $    214          $    154          $     86         $    146        59%
     A&H Insurance ..................           1,073               278               140              935        15%
     Specialty Property & Casualty ..             634               178                72              528        14%
                                       ---------------  ----------------  ----------------  ---------------  ----------------
       TOTAL PREMIUMS ...............        $  1,921          $    610          $    298         $  1,609        19%
                                       ===============  ================  ================  ===============  ================
</TABLE>

                                     - 22 -
<PAGE>
<TABLE>
<CAPTION>
                                                                                         SCHEDULE  II.3
                                      Aon Corporation and Subsidiaries
                                    SUPPLEMENTARY INSURANCE INFORMATION

                                                            Future
                                                            policy
                                                           benefits   Unearned
                                                Deferred    losses,   premiums
                                                 policy     claims    and other                     Net
                                               acquistion  and loss  policyholders'  Premium    investment
(millions)                                       costs     expenses     funds        revenue      income(1)
                                              ----------- ------------ ----------- ------------ -----------

YEAR ENDED DECEMBER 31, 1999
- - - - - - - - - - - - - - - - - ----------------------------

<S>                                           <C>         <C>          <C>         <C>          <C>
    Insurance brokerage and other services    $        -  $         -  $        -  $         -  $      159
    Consulting                                         -            -           -            -           3
    Insurance underwriting                           636        1,769       3,219        1,808         251
    Corporate and other                                -            -           -            -         164
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $      636  $     1,769  $    3,219  $     1,808  $      577
                                              =========== ============ =========== ============ ===========

YEAR ENDED DECEMBER 31, 1998
- - - - - - - - - - - - - - - - - ----------------------------

    Insurance brokerage and other services    $        -  $         -  $        -  $         -  $      194
    Consulting                                         -            -           -            -           6
    Insurance underwriting                           573        1,765       3,058        1,673         240
    Corporate and other                                -            -           -            -         150
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $      573  $     1,765  $    3,058  $     1,673  $      590
                                              =========== ============ =========== ============ ===========


YEAR ENDED DECEMBER 31, 1997
- - - - - - - - - - - - - - - - - ----------------------------

    Insurance brokerage and other services    $        -  $         -  $        -  $         -  $      163
    Consulting                                         -            -           -            -           6
    Insurance underwriting                           549        1,752       2,698        1,609         214
    Corporate and other                                -            -           -            -         117
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $      549  $     1,752  $    2,698  $     1,609  $      500
                                              =========== ============ =========== ============ ===========



                                                            Benefits   Amortization
                                                             claims,   of deferred
                                             Commissions,  losses and    policy       Other
                                                 fees     settlement   acquisition  operating    Premiums
 (millions)                                    and other    expenses      costs      expenses   written(2)
                                              ----------- ------------ ----------- ------------ -----------

YEAR ENDED DECEMBER 31, 1999
- - - - - - - - - - - - - - - - - ----------------------------

    Insurance brokerage and other services    $    3,985  $         -  $        -  $     3,651  $        -
    Consulting                                       653            -           -          698           -
    Insurance underwriting                            47          973         247          596       1,787
    Corporate and other                                -            -           -          270           -
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $    4,685  $       973  $      247  $     5,215  $    1,787
                                              =========== ============ =========== ============ ===========



YEAR ENDED DECEMBER 31, 1998
- - - - - - - - - - - - - - - - - ----------------------------

    Insurance brokerage and other services    $    3,588  $         -  $        -  $     3,119  $        -
    Consulting                                       609            -           -          547           -
    Insurance underwriting                            33          896         216          551       1,668
    Corporate and other                                -            -           -          233           -
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $    4,230  $       896  $      216  $     4,450  $    1,668
                                              =========== ============ =========== ============ ===========


YEAR ENDED DECEMBER 31, 1997
- - - - - - - - - - - - - - - - - ----------------------------

    Insurance brokerage and other services    $    3,058  $         -  $        -  $     2,917  $        -
    Consulting                                       547            -           -          508           -
    Insurance underwriting                            35          842         208          530       1,596
    Corporate and other                                2            -           -          204           -
                                              ----------- ------------ ----------- ------------ -----------
              TOTAL                           $    3,642  $       842  $      208  $     4,159  $    1,596
                                              =========== ============ =========== ============ ===========
<FN>
(1)   The above results  reflect  allocations  of investment  income and certain
      expense elements  considered  reasonable under the circumstances.  Results
      include income (loss) on disposals of investments.
(2)   Net of reinsurance ceded.
</FN>
</TABLE>

                                     - 23 -
<PAGE>
                         Cross Reference Sheet, Pursuant
                           to General Instruction G(4)


Item in Form 10-K                            Incorporated by Reference to
- - - - - - - - - - - - - - - - - -----------------                            ----------------------------

PART I
- - - - - - - - - - - - - - - - - ------

Item 1. Business                             Annual  Report to  Stockholders  of
                                             the  Registrant  for the Year  1999
                                             ("Annual  Report")  pages 8 through
                                             17, 19 through 21,  and  pages  35,
                                             49 and 50.

Item 3. Legal  Proceedings                   Annual Report pages 47 and 48 (note
                                             13   of   Notes   to   Consolidated
                                             Financial Statements).

PART II
- - - - - - - - - - - - - - - - - -------

Item 5. Market for the Registrant's          Annual  Report  page 40  (note 9 of
        Common Stock and Related             Notes  to  Consolidated   Financial
        Security Holder Matters              Statements) and page 52 ("Dividends
                                             paid per share" and "Price range").

Item 6. Selected Financial Data              Annual Report page 52.

Item 7. Management's  Discussion             Annual  Report  pages  18  through
        and Analysis of Financial            24 and   page  54   ( "Information
        Condition and Results of             Concerning         Forward-Looking
        Operations                           Statements").


Item 7A. Quantitative and Qualitative        Annual   Report  pages  23  and  24
         Disclosures about Market Risk       ("Market Risk Exposure").


Item 8. Financial Statements and             Annual  Report  pages 25 through 50
        Supplementary Data                   and 53.


PART III
- - - - - - - - - - - - - - - - - --------

Item 10. Directors and Executive             Proxy  Statement For Annual Meeting
         Officers of the Registrant          of  Stockholders  on April 18, 2000
                                             of    the    Registrant     ("Proxy
                                             Statement")  pages  3, 6, 7, and 10
                                             through 12.

Item 11. Executive Compensation              Proxy  Statement  pages 14  through
                                             17.

Item 12. Security Ownership of               Proxy Statement pages 2, 9 and 10.
         Certain Beneficial Owners
         and Management


Item 13. Certain Relationships and           Proxy Statement page 21
         Related Transactions                ("Transactions With Management").


PART IV
- - - - - - - - - - - - - - - - - -------

Item 14. Exhibits, Financial Statement       Annual Report pages 25 through 50.
         Schedules, And Reports on
         Form 8-K


                                     - 24 -
<PAGE>
                                  EXHIBIT INDEX

EXHIBIT NUMBER                                                    PAGE NUMBER OF
REGULATION                                                        SEQUENTIALLY
S-K, ITEM 601                                                     NUMBERED COPY
- - - - - - - - - - - - - - - - - -------------                                                     -------------

(3)   Articles of incorporation and bylaws:

      (a)   Second  Restated  Certificate of  Incorporation  of the Registrant -
            incorporated by reference to Exhibit 3(a) to the 1991 Form 10-K.

      (b)   Certificate  of  Amendment  of  the  Registrant's   Second  Restated
            Certificate of  Incorporation - incorporated by reference to Exhibit
            3 to the First Quarter 1994 Form 10-Q.

      (c)   Bylaws of the Registrant - incorporated by reference to Exhibit (d)
            to the 1982 Form 10-K.

      (d)   Certificate of Designation for the Registrant's  Series C Cumulative
            Preferred  Stock -  incorporated  by reference to Exhibit 4.1 to the
            Registrant's Current Report on Form 8-K dated February 9, 1994.

(4)   Instruments defining the rights of security holders, including indentures:

      (a)   Indenture  dated  September  15,  1992  between the  Registrant  and
            Continental   Bank   Corporation  (now  known  as  Bank  of  America
            Illinois), as Trustee - incorporated by reference to Exhibit 4(a) of
            the  Registrant's  Current  Report on Form 8-K dated  September  23,
            1992.

      (b)   Resolutions  establishing  terms of 6.875%  Notes Due 1999 and 7.40%
            Notes Due 2002 -  incorporated  by  reference to Exhibit 4(d) to the
            1992 Form 10-K.

      (c)   Resolutions   establishing   the  terms  of  6.70%  Notes  Due  2003
            incorporated by reference to Exhibit 4(c) to the 1993 Form 10-K.

      (d)   Resolutions   establishing   the  terms  of  6.30%  Notes  Due  2004
            incorporated by reference to Exhibit 4(d) to the 1993 Form 10-K.

      (e)   Resolutions establishing the terms of 6.90% Notes due 2004.

      (f)   Junior  Subordinated  Indenture dated as of January 13, 1997 between
            the  Registrant  and The Bank of New York, as trustee - incorporated
            by reference to Exhibit 4.1 of the  Registrant's  Amendment No. 1 to
            Registration  Statement  on Form S-4 No.  333-21237  dated March 27,
            1997 (the "Capital Securities Registration").

      (g)   First  Supplemental  Indenture  dated as of January 13, 1997 between
            the  Registrant  and the Bank of New York, as trustee - incorporated
            by reference to Exhibit 4.2 of the Capital Securities Registration.

      (h)   Certificate of Trust of Aon Capital A - incorporated by reference to
            Exhibit 4.3 of the Capital Securities Registration.


                                     - 25 -
<PAGE>
                                  EXHIBIT INDEX

EXHIBIT NUMBER                                                    PAGE NUMBER OF
REGULATION                                                        SEQUENTIALLY
S-K, ITEM 601                                                     NUMBERED COPY
- - - - - - - - - - - - - - - - - -------------                                                     -------------

      (i)   Amended and  Restated  Trust  Agreement of Aon Capital A dated as of
            January 13, 1997 among the Registrant, as Depositor, The Bank of New
            York,  as  Property  Trustee,  The Bank of New York  (Delaware),  as
            Delaware Trustee, the Administrative  Trustees named therein and the
            holders, from time to time, of the Capital Securities - incorporated
            by reference to Exhibit 4.5 of the Capital Securities Registration.

      (j)   Capital Securities  Guarantee Agreement dated as of January 13, 1997
            between  the  Registrant  and the  Bank of New  York,  as  guarantee
            trustee -  incorporated  by  reference to Exhibit 4.8 of the Capital
            Securities Registration.

      (k)   Capital Securities  Exchange and Registration Rights Agreement dated
            as of January  13,  1997  among the  Registrant,  Aon  Capital A and
            Morgan  Stanley  & Co.  Incorporated  and  Goldman,  Sachs  & Co.  -
            incorporated by reference to Exhibit 4.10 of the Capital  Securities
            Registration.

      (l)   Debenture  Exchange and  Registration  Rights  Agreement dated as of
            January  13,  1997 among the  Registrant,  Aon  Capital A and Morgan
            Stanley & Co.  Incorporated and Goldman,  Sachs & Co. - incorporated
            by reference to Exhibit 4.11 of the Capital Securities Registration.

      (m)   Guarantee  Exchange and  Registration  Rights  Agreement dated as of
            January  13,  1997 among the  Registrant,  Aon  Capital A and Morgan
            Stanley & Co.  Incorporated and Goldman,  Sachs & Co. - incorporated
            by reference to Exhibit 4.12 of the Capital Securities Registration.


(10)  Material Contracts:

      (a)   Aon Stock  Option  Plan (as  amended and  restated  through  1997) -
            incorporated  by  reference  to  Exhibit  10(a) to the  Registrant's
            Quarterly  Report to the Securities and Exchange  Commission on Form
            10-Q for the quarter  ended March 31, 1997 (the "First  Quarter 1997
            Form 10-Q").

      (b)   First Amendment to the Aon Stock Option Plan as Amended and Restated
            Through 1997 -  incorporated  by  reference to Exhibit  10(a) to the
            Registrant's   Quarterly  Report  to  the  Securities  and  Exchange
            Commission  on Form 10-Q for the  quarter  ended March 31, 1999 (the
            "First Quarter 1999 Form 10-Q").

      (c)   Registration  Rights  Agreement  by  and  among  the  Registrant and
            certain affiliates  of Ryan Insurance Group, Inc. (Including Patrick
            G.  Ryan  and  Andrew J. McKenna) -  incorporated  by  reference  to
            Exhibit (f) to the 1982 Form 10-K.

      (d)   Aon Corporation Outside Director Deferred Compensation  Agreement by
            and among Registrant and Registrant's directors who are not salaried
            employees of Registrant or Registrant's affiliates.


                                     - 26 -
<PAGE>
                                  EXHIBIT INDEX

EXHIBIT NUMBER                                                    PAGE NUMBER OF
REGULATION                                                        SEQUENTIALLY
S-K, ITEM 601                                                     NUMBERED COPY
- - - - - - - - - - - - - - - - - -------------                                                     -------------

      (e)   Aon Stock  Award  Plan (as  amended  and  restated  through  1997) -
            incorporated by reference to Exhibit 10(b) to the First Quarter 1997
            Form 10-Q.

      (f)   First  Amendment to the Aon Stock Award Plan as Amended and Restated
            Through 1997 -  incorporated  by  reference to exhibit  10(b) to the
            First Quarter 1999 Form 10-Q.

      (g)   Amendment  and Waiver  Agreement  dated as of November 4, 1991 among
            the  Registrant  and each of  Patrick G. Ryan,  Shirley  Ryan,  Ryan
            Enterprises  Corporation  and  Harvey N.  Medvin -  incorporated  by
            reference to Exhibit 10(j) to the 1991 Form 10-K.

      (h)   Registration  Rights   Agreement   dated  November  2, 1992  by  and
            between the Registrant and Frank B. Hall & Co., Inc. -  incorporated
            by reference to Exhibit  4(c)  to  the Third Quarter 1992 Form 10-Q.

      (i)   Aon  Corporation  1994 Amended and Restated  Outside  Director Stock
            Award Plan - incorporated by reference to Exhibit 10(b) to the First
            Quarter 1994 Form 10-Q.

      (j)   Aon Corporation 1995 Senior Officer  Incentive  Compensation  Plan -
            incorporated by reference to Exhibit 10(p) to the 1995 Form 10-K.

      (k)   Aon  Deferred  Compensation  Plan  and  First  Amendment  to the Aon
            Deferred  Compensation  Plan - incorporated  by reference to Exhibit
            10(q) to the 1995 Form 10-K.

      (l)   1999 Aon Deferred Compensation Plan.

      (m)   Aon Severance Plan - incorporated  by reference to Exhibit 10 to the
            Registrant's   Quarterly  Report  to  the  Securities  and  Exchange
            Commission on Form 10-Q for the quarter ended June 30, 1997.

      (n)   Asset Purchase  Agreement dated July 24, 1992 between the Registrant
            and Frank B. Hall & Co. Inc. - incorporated  by reference to Exhibit
            10(c) to the  Registrant's  Quarterly  Report  on Form  10-Q for the
            period ended June 30, 1992.

      (o)   Stock  Purchase  Agreement  by and  among the  Registrant,  Combined
            Insurance Company of America,  Union Fidelity Life Insurance Company
            and General  Electric Capital  Corporation  dated as of November 11,
            1995 -  incorporated  by reference to Exhibit 10(s) of the 1995 Form
            10-K.

      (p)   Stock Purchase Agreement  by  and  among  the  Registrant;  Combined
            Insurance  Company  of  America;   The  Life  Insurance  Company  of
            Virginia;  Forth Financial Resources, Ltd.;  Newco Properties, Inc.;
            and General  Electric  Capital  Corporation dated as of December 22,
            1995 - incorporated by reference  to  Exhibit 10(t) to the 1995 Form
            10-K.

                                     - 27 -
<PAGE>
                                  EXHIBIT INDEX

EXHIBIT NUMBER                                                    PAGE NUMBER OF
REGULATION                                                        SEQUENTIALLY
S-K, ITEM 601                                                     NUMBERED COPY
- - - - - - - - - - - - - - - - - -------------                                                     -------------

      (q)   Agreement and Plan of Merger among the Registrant, Purchaser and A&A
            dated as of December 11, 1996 - incorporated by reference to Exhibit
            (c)(1) to the  Registrant's  Schedule  14D-1  filed  with the SEC on
            December 16, 1996.

      (r)   First  Amendment to Agreement and Plan of Merger dated as of January
            7, 1997 among the  Registrant,  Purchaser and A&A - incorporated  by
            reference  to  Exhibit   (c)(3)  to  Schedule  14D-1  filed  by  the
            Registrant with the SEC on January 9, 1997.

      (s)   Employment Agreement dated June 1, 1993 by and among the Registrant,
            Aon Risk Services,  Inc. and Michael D. O'Halleran,  incorporated by
            reference to Exhibit 10(p) to the Registrant's  Annual Report to the
            Securities  and Exchange  Commission on Form 10-K for the year ended
            December 31, 1998.

(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.

(13)  Annual  Report  to  Stockholders  of the  Registrant  for the  year  ended
      December 31, 1999.

(21)  List of subsidiaries of the Registrant.


(23)  Consent of Ernst & Young LLP to the  incorporation by reference into Aon's
      Annual  Report on Form 10-K of their  report  included  in the 1999 Annual
      Report  to  Stockholders  and  into  Aon's  Registration   Statement  Nos.
      33-27984,  33-42575,  33-59037,   333-21237,   333-50607,   333-55773  and
      333-78723.

(99)  Annual Report to the Securities  and Exchange  Commission on Form 11-K for
      the Aon Savings Plan for the year ended December 31, 1999 - to be filed by
      amendment as provided in Rule 15d-21(b).

                                     - 28 -
<PAGE>

                                                                    EXHIBIT 4(e)

      Resolutions Establishing the terms of 6.9% Notes due 2004.


      WHEREAS,  the Board of Directors of the Company previously  authorized and
      approved,  pursuant  to  resolutions  duly  adopted on April 16, 1999 (the
      "Resolutions"),  the issuance of debt  securities and capital stock of the
      Company  (the  "Securities")  in such  amounts,  with such terms,  in such
      manner and at such price in one or more  series as the  special  committee
      (the "Special Committee")  established in the Resolutions may from time to
      time determine, provided that the aggregate amount of the Securities to be
      so issued does not exceed $500,000,000;

      WHEREAS,  the Board of Directors  empowered the Special Committee pursuant
      to the Resolutions  with all the powers and authority of the full Board of
      Directors to take all actions relating to the creation,  issuance and sale
      of the  Securities  including  in the  case  of debt  securities,  but not
      limited  to,  determining  or  approving  (1)  the  type  of  security  or
      securities;  (2) the title or titles thereof;  (3) the aggregate principal
      amount and denominations  thereof; (4) the maturity or maturities thereof;
      (5) the  interest  rate or rates  (which may be fixed or  variable)  to be
      borne thereby;  (6) the form of subordination,  if any; (7) any conversion
      rate;  (8) any  optional or  mandatory  redemption  provisions  in respect
      thereof,  including  sinking  fund  provisions;  (9) any  affirmative  and
      negative  covenants to be imposed on the Company in respect thereof;  (10)
      any events of default in respect thereof; (11) any rights of defeasance in
      respect  thereof;  and  (12)  any  and all  other  terms,  conditions  and
      provisions in respect thereof; and

      WHEREAS, this Special Committee believes it is in the best interest of the
      Company  to  create  debt   securities  as  set  forth  in  the  following
      resolutions  under  an  Indenture  dated as of  September  15,  1992  (the
      "Indenture"),  between the Company and The Bank of New York,  as successor
      trustee to Continental Bank National Association (the "Trustee").

      RESOLVED,  that the Company  hereby  establishes a series of the Company's
      debt securities to be issued under the Indenture,  such debt securities to
      have the  following  title and terms (all  capitalized  terms used  herein
      which are defined in the Indenture are used as defined therein):

            1.    The  title  of the  issue  of the  debt  securities  shall  be
                  "6.90% Notes Due 2004" (the "Notes");

            2.    The  aggregate  principal  amount  of the  Notes  which may be
                  authenticated  and delivered  under the Indenture  (except for
                  Notes   authenticated   and  delivered  upon  registration  or
                  transfer  of, or in exchange  for, or in lieu of,  other 6.90%
                  Notes  pursuant to Sections 2.05,  2.06,  2.07 and 3.03 of the
                  Indenture) shall be, and is hereby limited to, $250,000,000;

<PAGE>
            3.    The  date  on  which  the  principal  of the  Notes  shall  be
                  payable shall be July 1, 2004;

            4.    The  Notes  shall  bear  interest  at the  rate of  6.90%  per
                  annum.  Interest  on the  Notes  shall  accrue  from  June 29,
                  1999, or from the most recent  Interest  Payment Date to which
                  interest has been paid or provided  for.  Accrued  interest on
                  the Notes  shall be  payable on  January 1  and July 1 in each
                  year,  to the persons in whose names the Notes are  registered
                  at the close of  business  on the  preceding  December 15  and
                  June 15, respectively;

            5.    The  Place of  Payment  for the Notes  shall be the  office or
                  agency  of the  Trustee  maintained  for that  purpose  in the
                  City of Chicago and in the Borough of  Manhattan,  the City of
                  New York; and

            6.    The  Notes  shall  not  be  subject  to  redemption  prior  to
                  maturity and will not be entitled to any sinking fund.

      FURTHER  RESOLVED,  that the Notes shall be issued only in registered form
      without coupons;

      FURTHER  RESOLVED,  the  purchase  price to be paid to the Company for the
      sale of the Notes to the "Underwriters" (as defined below) shall be 99.27%
      of the principal  amount of the Notes,  and the initial  offering price to
      the  public of the Notes  shall be 99.87% of the  principal  amount of the
      Notes, with no accrued interest payable on the date of delivery;

      FURTHER RESOLVED, that the form of the Notes shall be substantially in the
      form attached to this consent action;

      FURTHER  RESOLVED,  that the Notes shall be sold,  under a firm commitment
      underwriting,  to the Underwriters (the "Underwriters")  identified in the
      Underwriting  Agreement  (the  "Underwriting  Agreement")  to be  executed
      between the Company and Morgan Stanley & Co.  Incorporated and Aon Capital
      Markets as the Underwriters named therein;

      FURTHER  RESOLVED,  that the Chairman  and Chief  Executive  Officer,  the
      President and Chief Operating Officer, and any Executive Vice President of
      the Company (either one acting alone) be, and each hereby is,  authorized,
      in the name and on behalf of the  Company,  to  execute  and  deliver  the
      Underwriting  Agreement providing for the sale of the Notes therein to the
      Underwriters  substantially  in  the  form  distributed  to  each  of  the
      undersigned  prior  hereto,  with full  power and  authority  to make such
      changes or additions thereto as any of them may approve,  such approval to
      be conclusively evidenced by the execution thereof; and

                                     - 2 -
<PAGE>
      FURTHER RESOLVED, that there be issued under the Indenture,  and delivered
      and sold under the Underwriting  Agreement as executed (against receipt by
      the Company of payment as therein  provided),  the Notes, and the Chairman
      and Chief Executive Officer, the President and Chief Operating Officer and
      any Executive Vice President (either one acting alone) be, and each hereby
      is, authorized,  on behalf of the Company, to execute the Notes (by manual
      or facsimile  signatures),  under its corporate  seal  reproduced  thereon
      attested (by manual or facsimile signatures) by the Corporate Secretary or
      any Assistant  Secretary and to deliver the Notes to the Trustee;  and the
      Trustee  be,  and  hereby  is,   authorized  and  directed   thereupon  to
      authenticate  and deliver the Notes in accordance  with the  provisions of
      Section  2.03  of  the  Indenture,  the  Notes  when  authenticated  to be
      delivered  by the  Trustee  upon  the  order  of the  Chairman  and  Chief
      Executive  Officer,  the  President  and Chief  Operating  Officer  or any
      Executive Vice  President as and when the  conditions  with respect to the
      authentication and delivery thereof under the Indenture have been complied
      with.

                                     - 3 -
<PAGE>

                                                                   EXHIBIT 10(d)



                                 AON CORPORATION
                    OUTSIDE DIRECTORS DEFERRED COMPENSATION'
                                    AGREEMENT


      This  Deferred  Compensation  Agreement is entered into by and between Aon
Corporation, a Delaware corporation (the "Company"), and the "Director" named on
the Election Form, which is hereby incorporated as part of this agreement.

                                   WITNESSETH

      WHEREAS,  the  Director  is  expected to be  nominated  for  election as a
Director  of the  Company  at the next  annual  meeting of  stockholders  of the
Company  (the "Annual  Meeting")  and  desires,  beginning  with the date of the
Annual Meeting and for as long as the Director  serves in that capacity or until
the  Director  desires to  terminate  or amend this  agreement,  to defer in the
manner hereinafter set forth all or a portion of the fees to which he or she may
become  entitled  for serving as a Director of the  Company,  including  fees to
which he or she may become  entitled for serving as a member of any committee of
the Board of Directors (collectively, "Director's Fees"); and

      WHEREAS, the Company is agreeable to such deferrals,  subject to the terms
and conditions set forth herein.

      NOW THEREFORE, in consideration of the Director's services for the Company
and other good and valuable consideration, the parties hereto agree as follows:


1.    DIRECTOR'S FEE DEFERRAL
      -----------------------

      The Director hereby irrevocably elects, beginning with the Annual Meeting,
      to defer the percent of the Director's  Fees to which he or she may become
      entitled with respect to his or her services as a  Director (or  committee
      member) as the Director has specified on the Election Form.

      1.    With  respect  to a  Director's  election  to defer any  portion  of
            Director's Fees, an account (the "Aon Common Stock Account") will be
            credited with such additions as the Director has elected to defer to
            such  account.  For purposes of crediting  Director's  Fees deferred
            amounts  shall be assumed to have been invested in Aon Common Stock.
            The amount of shares so credited  will be determined by dividing the
            deferred  amount by the fair market value of Aon Common Stock on the
            New York Stock Exchange for the day such  Director's Fees would have
            been  payable to the Director  had it not been  deferred.  The "Fair
            Market  Value" on any day is the  average of the  highest and lowest
            price at which  the stock  was sold on the New York  Stock  Exchange
            that day.  As of the date any  dividend is paid to holders of shares
            of Aon Common Stock,  the Aon Common Stock Account shall be credited
            with a number of

<PAGE>
            additional shares,  including fractions thereof, of Aon Common Stock
            that  could  have  been purchased,  with the amount which would have
            been payable as dividends, on such date with regard to the number of
            shares,  and  fractions thereof, credited to  the  Aon  Common Stock
            Account, assuming the  purchase price per share is equal to the Fair
            Market Value as of the payment date.

      2.    With  respect  to a  Director's  election  to defer any  portion  of
            Director's  Fees,  and account (the "Aon General  Account")  will be
            credited with such additions as the Director has elected to defer to
            such  account.  For purposes of computing  such  addition,  deferred
            amounts shall be credited as of the day such  Director's  Fees would
            have been payable to the Director had it not been deferred, and such
            deferrals shall be credited with interest,  compounded semiannually,
            at the  annual  rate  determined  as of January 1 and July 1 of each
            year  by  averaging  the  one-year Treasury  Bill yield as published
            monthly  by the Federal Reserve Bank of St. Louis on a bank discount
            basis  through  the  secondary  market  for   the  last  six  months
            immediately prior thereto.


2.    PAYMENT OF DEFERRED AMOUNTS
      ---------------------------

      Amounts  in cash  equal to the  value(s)  of the  Director's  Aon  General
      Account,  as  determined  above,  shall  be  payable  to the  Director  as
      specified on the Election  Form.  Distributions  from the Aon Common Stock
      Account may be made in cash, in Aon Common Stock,  or in a combination  of
      cash and Aon Common Stock.

3.    BENEFICIARY OF DEFERRED AMOUNTS
      -------------------------------

      Any amounts payable upon death of the Director pursuant to Section 2 shall
      be paid to the beneficiary  designated in writing by the Director provided
      such  writing has been  delivered to the Company  prior to the  Director's
      death.  If no beneficiary  is so  designated,  payment will be made to the
      Director's estate.  The Director may change the designated  beneficiary by
      filing with the Company a new beneficiary designation.

4.    MISCELLANEOUS
      -------------

      1.    Nothing contained in this Agreement shall be construed as conferring
            upon the  Director the right to continue to be  associated  with the
            Company in any capacity.

      2.    The Company's  obligation to make payments of deferred  compensation
            shall be the general  obligation  of the  Company and such  payments
            shall be made from the general assets of the Company. The Director's
            interests   hereunder  shall  not  be assignable and  any  purported
            assignment or transfer shall be void.

      3.    During the month prior to any annual meeting the Director may change
            the  percent of fees  deferred,  the amount in the Aon Common  Stock
            Account or the amount in the Aon General  Account by filing with the
            Company a new Election Form.

                                     - 2 -
<PAGE>

      4.    In the  event of  recapitalization,  stock  split,  stock  dividend,
            combination  or  exchange  of  shares  merger, consolidation, rights
            offering,  separation, reorganization  or liquidation,  or any other
            change  in  the corporate  structure  or shares of the Company,  the
            Board   of  Directors  of  the  Company  may   make  such  equitable
            adjustments to prevent dilution or enlargement of rights,  as it may
            deem  appropriate, in the number and  class of  shares so  credited.

      5.    This agreement shall be construed in accordance with and governed by
            the laws of the State of Illinois.

                                     - 3 -
<PAGE>

                                                                   Exhibit 10(l)

                     THE 1999 Aon DEFERRED COMPENSATION PLAN


      1.    PURPOSE

The name of this plan is the 1999 Aon Deferred  Compensation  Plan (the "Plan").
Its  purpose is to  provide  certain  select  management  or highly  compensated
employees of Aon  Corporation  and its  subsidiaries  (the  "Company")  with the
opportunity to defer amounts earned as an employee.  The Plan shall be effective
as of January 1, 1999.

      2.    ADMINISTRATION

The Plan shall be administered by the Organization  and  Compensation  Committee
(the  "Committee") of Aon  Corporation's  Board of Directors (the "Board").  The
Committee  shall have the authority to adopt rules and  regulations for carrying
out the Plan, to delegate its administrative responsibilities, as it shall, from
time to time,  deem  advisable,  and to interpret,  construe,  and implement the
provisions thereof.  Any decision or interpretation of any provision of the Plan
adopted  by the  Committee  shall  be final  and  conclusive.  Furthermore,  the
Committee may obtain such advice or  assistance,  as it deems  appropriate  from
persons not serving on the Committee.

      3.    ELIGIBILITY

Any staff employee of the Company who received wages or compensation as reported
on Box 1 of IRS Form W-2 of $125,000 or more in the prior calendar year or whose
rate of annual base pay in the current  calendar  year is $125,000 or more shall
be eligible to participate in the Plan subject to the  requirements of Section 3
hereof. In addition, other select management of highly compensated employees may
be eligible to participate at the option of the Committee.

Every eligible  employee shall become a participant  after making an election to
participate (the  "Participant")  on such forms as required by the Committee and
in accordance with Section 4.

      4.    ELECTIONS

On or before December 31 of any year,  each employee  eligible to participate in
the Plan shall be entitled  to make an  election  to defer  receipt of : (a) any
whole percentage of bi-weekly earnings paid to an employee for his service as an
employee  ("Compensation");  and (b) any whole  percentage of any  extraordinary
amount paid by the Company pursuant to but not limited to a periodic  individual
performance appraisal or a contractual agreement ("Bonus").

Each  Participant  shall also make an election as to the period of deferral  and
distribution in accordance with Section 6.

Elections made pursuant to this Section 4 shall remain in effect until such time
as they are amended by the Participant.  Any amendment will take place effective
with the next January 1 or earlier if permitted by the Committee.

      5.    DEFERRED AMOUNTS

Each  Participant  shall have  established  for his or her benefit an account to
which any amounts  deferred shall be assumed to have been invested in Aon Common
Stock and credited to the Participant's  Account (the "Account").  The amount of
shares so credited to the Account  will be  determined  by dividing the deferred
amount  by the fair  market  value  of Aon  Common  Stock on the New York  Stock
Exchange for the day such  Compensation  or Bonus would have been payable to the
Participant  had it not  been  deferred.  Fair  Market  Value  on any day is the
average  of the  highest  and  lowest  prices as  quoted  on the New York  Stock
Exchange,  as  published  in The Wall  Street  Journal,  or, if The Wall  Street
Journal  is no  longer  published  , such  other  periodical  as  chosen  by the
Committee.


<PAGE>
As of each dividend payment date, each  Participant's  Account shall be credited
with  dividends  that  would be paid with  respect  to Aon  Common  Stock on the
dividend  payment date as if the Participant  owned the stock credited to his or
her Account as of the record date.  Dividends  will be credited as if reinvested
in whole or fractional shares on the dividend payment date.

In the event of a recapitalization,  stock split, stock dividend, combination or
exchange  of  shares,  merger,  consolidation,   rights  offering,   separation,
reorganization or liquidation, or any other change in the corporate structure or
shares of the Company,  the Committee may make such  equitable  adjustments,  to
prevent  dilution or  enlargement of rights,  as it may deem  appropriate in the
number and class of shares so credited.

      6.    METHOD OF DISTRIBUTION

At the time the  Participant  elects to defer  Compensation of Bonus pursuant to
Section 4, the Participant  shall also make an election as to the beginning date
of  distribution  ("Elected  Distribution  Date") with  respect to the amount of
shares  credited  to the  Accounts of the  Participant  and the number of annual
installments,  not in excess of fifteen,  over which such  distribution  will be
made.   Distributions  shall  commence  with  30  days  following  the  date  of
distribution specified by the Participant.

Distributions  will be made in the  form of Aon  Common  Stock  with  fractional
shares payable in the form of cash.

If the  Participant  terminates  employment  for any reason prior to the Elected
Distribution  Date,  distributions  shall  commence  within  the  30-day  period
following the first  business day of the first  calendar year following the year
in which employment terminated, and said distributions shall be made in the same
number of annual installments as had been elected by the Participant.

If  any  Participant   dies  before  receiving  all  amounts  credited  to  such
Participant's  Accounts,  the undistributed  amounts shall be distributed to the
Participant's beneficiary or beneficiaries in accordance with the last effective
beneficiary  designation  form filed by the Participant  with the Company.  Such
undistributed  amounts  will be  distributed  in the same manner and at the same
time as had been elected by the Participant prior to such  Participant's  death.
If a Participant has failed to designate a beneficiary any shares  distributable
hereunder shall be distributed to the estate.

The Committee may in its sole discretion  determine that a distribution shall be
made  over a shorter  or longer  period  or in more  frequent  installments,  or
commence on an earlier or later date, or any or all of the above.

      7.    TAXES

The Committee  may, in its discretion and subject to such rules as it may adopt,
permit a Participant to pay all or a portion of such taxes arising in connection
with a  distribution  pursuant  to  Section 6 by  electing  to have the  Company
withhold  shares of Common Stock  otherwise  distributable  having a Fair Market
Value equal to all or any portion of such tax to be satisfied in this manner.

      8.    IMPACT ON OTHER BENEFITS

The amount of each  Participant's  Compensation  or Bonus which the  Participant
elects to defer under the Plan shall be deemed  compensation  for the purpose of
calculating the amount of a Participant's  benefits or  contributions  under all
retirement  and welfare  benefit plans  sponsored by the Company,  except to the
extent not permitted under such retirement or welfare benefit plan and except to
the extent not permitted under the Internal Revenue Code.

      9.    PARTICIPANT'S RIGHTS

Nothing in the Plan shall confer on a  Participant  any right to continue in the
employ of the Company or in any way affect the Company's  right to terminate the
Participant's  employment  at any time  without  prior  notice  or for any or no
reason.

All amounts  deferred or otherwise  held for the account of a Participant  under
the Plan shall  remain the sole  property of the  Company.  With respect to such
amounts, the Participant is merely a general creditor, and any obligation of the
Company  hereunder is purely  contractual  and shall not be funded or secured in
any way.


<PAGE>
      10.   NONALIENABILITY AND NONTRANSFERABILITY

No amounts, whether deferred or distributable, shall be subject in any manner to
anticipation,  alienation,  sale,  transfer,  assignment,  pledge,  encumbrance,
charge,  garnishment,  execution,  or levy of any  kind,  whether  voluntary  or
involuntary,  including any liability which is for alimony or other payments for
the support of a spouse or former spouse.

      11.   AMENDMENT AND TERMINATION

The Board reserves the right to amend, modify or terminate the Plan at any time,
subject to any applicable rule or regulation.

      12.   NOTICES

All notices to the Company hereunder shall be delivered to the attention of:

                                 Robert D. Sloan
                                 Aon Corporation
                        123 North Wacker Drive, 9th Floor
                                Chicago, IL 60606

Such notice  shall be deemed given as of the date of delivery or, if delivery is
made  by  mail,  as of the  date  shown  on the  postmark  or  the  receipt  for
registration or certification.

      13.   CONTROLLING LAW

Except to the extent  superseded  by federal law, the laws of Illinois  shall be
controlling in all matters relating to the Plan.

      14.   SEVERABILITY

Whenever  possible,  each  provision  of the Plan shall be  interpreted  in such
manner as to be effective and valid under  applicable  law, but if any provision
of the Plan shall be held to be prohibited by or invalid under  applicable  law,
then (a) such provision shall be deemed amended,  and to have contained from the
outset such language as shall be necessary to,  accomplish the objectives of the
provision as originally  written to the fullest extent  permitted by law and (b)
all other provisions of the Plan shall remain in full force and effect.

      15.   LIABILITY

No member of the Board and no employee  of the  Company  shall be liable for any
act or action hereunder  whether by omission or commission,  by any other member
or employee or by any agent to whom duties in connection with the administration
of the Plan have been delegated or, except in circumstances involving his or her
bad faith, gross negligence or fraud, of anything done or admitted to be done by
him or herself.


      16.   SUCCESSORS

The  provisions  of the Plan shall bind and inure to the  benefit of the Company
and its  successors  and  assigns.  The term  "successors"  as used herein shall
include  any  corporation  or other  business  entity  which  shall  by  merger,
consolidation,  purchase, or otherwise,  acquire all or substantially all of the
business and assets of the Company and  successors  of any such  corporation  or
other business entity.

<PAGE>

<TABLE>
<CAPTION>
                                                                              Exhibit 12(a)

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



                                                          Years Ended December 31,
                                            -----------------------------------------------------
 (millions except ratios)                     1999       1998       1997      1996       1995
                                            --------   --------   --------   -------   --------

<S>                                           <C>        <C>        <C>       <C>        <C>
 Income from continuing operations
    before provision for income taxes (1)   $   635    $   931    $   542    $  446     $  458

 ADD BACK FIXED CHARGES:

    Interest on indebtedness                    105         87         70        45         56

    Interest on ESOP                              1          2          3         4          5

    Portion of rents representative of
      interest factor                            49         51         44        29         21

                                            --------   --------   --------   -------   --------
         INCOME AS ADJUSTED                 $   790    $ 1,071    $   659    $  524     $  540
                                            ========   ========   ========   =======   ========


 FIXED CHARGES:

    Interest on indebtedness                $   105    $    87    $    70    $   45     $   56

    Interest on ESOP                              1          2          3         4          5

    Portion of rents representative of
       interest factor                           49         51         44        29         21

                                            --------   --------   --------   -------   --------
         TOTAL FIXED CHARGES                $   155     $  140    $   117     $  78     $   82
                                            ========   ========   ========   =======   ========

 RATIO OF EARNINGS TO FIXED CHARGES             5.1        7.6        5.6       6.7        6.6
                                            ========   ========   ========   =======   ========
<FN>
 (1)   Income from continuing  operations  before provision for income taxes and
       minority interest includes special charges of $313 million,  $172 million
       and $90 million for the years ended  December  31,  1999,  1997 and 1996,
       respectively.
</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



                                                          Years Ended December 31,
                                             --------------------------------------------------
 (millions except ratios)                     1999       1998      1997       1996       1995
                                             -------   --------   -------   --------   --------

<S>                                           <C>        <C>       <C>        <C>        <C>
 Income from continuing operations
    before provision for income taxes (1)    $  635     $  931     $ 542      $ 446      $ 458

 ADD BACK FIXED CHARGES:

    Interest on indebtedness                    105         87        70         45         56

    Interest on ESOP                              1          2         3          4          5

    Portion of rents representative of
      interest factor                            49         51        44         29         21

                                             -------   --------   -------   --------   --------
         INCOME AS ADJUSTED                  $  790     $1,071     $ 659      $ 524      $ 540
                                             =======   ========   =======   ========   ========


 Fixed charges and preferred stock dividends:

    Interest on indebtedness                 $  105     $   87     $  70      $  45      $  56

    Preferred stock dividends                    70         70        82         29         38

                                             -------   --------   -------   --------   --------
         INTEREST AND DIVIDENDS                 175        157       152         74         94

    Interest on ESOP                              1          2         3          4          5

    Portion of rents representative of
       interest factor                           49         51        44         29         21

                                             -------   --------   -------   --------   --------
         TOTAL FIXED CHARGES AND PREFERRED
             STOCK DIVIDENDS                 $  225     $  210     $ 199      $ 107      $ 120
                                             =======   ========   =======   ========   ========

 RATIO OF EARNINGS TO COMBINED FIXED
   CHARGES AND PREFERRED STOCK DIVIDENDS (2)    3.5        5.1       3.3        4.9        4.5
                                             =======   ========   =======   ========   ========
<FN>
(1)   Income from continuing  operations  before  provision for income taxes and
      minority interest  includes special charges of $313 million,  $172 million
      and $90 million  for the years ended  December  31,  1999,  1997 and 1996,
      respectively.

(2)   Included in total fixed  charges and  preferred  stock  dividends  are $66
      million for the years ended December 31, 1999 and 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 consolidated statements of income.
</FN>
</TABLE>

*** PICTURE OMITTED ***

                        WELCOME TO THE NEW WORLD OF RISK

The old world  of  risk was a fairly orderly place.  Things caught fire,  people
were injured,  products failed. Customers understood those kinds of risk and how
to manage them. That was the old world of risk.

Traditional  property risk has been joined by the risks of a global  marketplace
where barriers are falling, the rules are changing and  your toughest competitor
might be the one that did not exist  yesterday.  The Internet makes any business
vulnerable to the next big idea.  Reinvention is an everyday  event. Catastrophe
can include the theft of ideas.  Priceless  intellectual capital can simply walk
out the door.

The  value  chain  is only as  strong  as the  weakest  global  interconnection.
Alliances  create  uneasy  marriages  that blur the lines  between  partner  and
predator.

Welcome to the new world of risk-financial, human, technological, organizational
and physical.  Merely handling insurance  transactions is not enough in this new
world. It takes an advocate.

                                     - 8 -
<PAGE>
Aon  has been building  an organization that can help clients deal  with the new
world  of risk. We are a leader in risk management advice,  brokerage  services,
human  resource consulting and  consumer  insurance.  That  work  started with a
vision.

Key parts of  the  vision are  worldwide  distribution,  dedicated  client focus
and the  highest  quality  professional  services.  We also have  redefined  and
expanded  the role of an  intermediary  - from a provider  of  products,  to our
current  position  as an  advocate  for  our  clients  in  risk  management  and
protection.

No  organization  is better  positioned  to deliver  the kind of  services  that
clients in virtually  every type of business  need.  Our advantage  centers on a
strong  presence in all the key channels of  distribution.  Our ability to reach
diverse kinds of clients means we can focus our  marketing,  making certain that
both our services and products align with identified needs.  Because we know the
clients,  we know the  issues - which  means  that we can offer  higher  quality
service and a selection of the best and most relevant  products.  It also allows
us to form stronger client relationships.

For Aon, our broad distribution  channels mean opportunity.  It is said that the
best  way to have a good  idea is to have a lot of  ideas.  That is what  unique
perspectives  on risk allow us to do. From the physical  risk of a building,  to
the  financial  risk of a new  venture,  to the risk of losing key talent -- and
beyond -- we try to see risk from all angles. The solutions we provide can apply
to many  clients.  A  one-size-fits-all  approach?  No, just the  opposite.  Our
diverse  lines of  business  and wide  experience  allow  us to  custom-fit  the
solution  to the  risk -  even  if it is so new  that  it  takes an  experienced
specialist to see it.

                                     - 9 -
<PAGE>

*** PICTURE OMITTED ***

                                     - 10 -
<PAGE>

*** PICTURE OMITTED ***

                       DEVELOPING UNIQUE SOLUTIONS

The  ocean is  never  constant -- one  minute  tranquil,  the  next threatening.
Business conditions can change as quickly and dramatically  as the sea.  Aon has
the solutions to help companies navigate the risks and opportunities.


                                     - 11 -
<PAGE>
                       UNIQUE SOLUTIONS AROUND THE WORLD

New risks demand new solutions.  We provide them through a global network of 550
offices in 120  countries.  We have  hundreds of insurance  and risk  management
products, deep  expertise in a range of industries and the dedication to provide
the best available advice and execution.

*** PICTURE OMITTED ***

It is a formidable line-up.  But it is not enough.

We are realigning our  operations  around the need -- and the  opportunity -- to
focus all of our people, facilities, products and experience on client solutions
around the world.

By  combining  strengths  and  creating a more  integrated  platform  for global
services, we are developing a total solution that is stronger, more flexible and
more creative than anything our individual companies could provide alone. We can
draw the best  thinking and the most relevant  experience  from any point in our
organization, and quickly put them to work as an advocate for our clients.

                                     - 12 -
<PAGE>

ONE Aon
The expertise of our employees and our global presence  provide our clients with
the broadest and most efficient access to capital and risk management solutions,
so they can focus on the things that will drive  their  businesses  forward.  No
matter what or where the client's needs are,  through our expertise in insurance
brokerage and related services,  consulting and insurance  underwriting,  Aon is
able to harness  the best  thinking  in the  industry  to build risk  management
solutions in every corner of the world. From traditional  insurance coverage, to
uncovering  risks in  mergers,  to ensuring  that  companies  retain  their best
employees,  Aon is able to help clients  stay focused on their core  operations.
Among the businesses that comprise the "One Aon" that we bring to clients are:

Aon Risk Services,  one of the world's fastest growing insurance  brokers, helps
clients  finance and  transfer  risk in ways that  actually  free up capital and
remove  liabilities  from the balance sheet.  These services span from develoing
traditional   property  and  casualty  coverages,   to  creating  new  forms  of
intellectual  property protection,  to building directors and officers solutions
for Internet companies preparing their initial public offering.

Aon Re  Worldwide,  the largest  reinsurance  intermediary,  risk  transfer  and
financing  solutions  to  risk-bearing entities worldwide  (insurance companies,
risk  retention  groups, etc.).  Services  range  from  traditional  reinsurance
placement,  to the design  of creative,  holistic  products  which  utilize  our
sophisticated analytical and catastrophe modeling expertise. Throuqh its product
and industry specialization,  Aon Group Limited,  headquartered  in  the  United
Kingdom,  is a major contributor to Aon Re's leadership  position in every major
reinsurance  market.  Aon  Capital  Markets  is  among  the   world  leaders  in
securitizing catastrophic risk. It provides our clients access to capital beyond
traditional insurance and reinsurance markets. This group is at the forefront of
developing risk transfer securities  (CatBonds), contingent financing securities
(CatEPuts) and risk transfer swaps.

Aon Services  Group is comprised of  market-leading  wholesalers  and  specialty
brokerage that enable Aon to service independent insurance agents,  professional
and affinity groups, individual consumers and insurance carriers.

Alternative  Market Operations is a leader in specialty  underwriting  solutions
and custom-designed products and services.

Aon  Consulting  Worldwide is a leading human  resource  consulting and benefits
provider that helps maximize human  resource  productivity.  Services range from
creating  compensation  and  benefits  programs  for  multi-national  firms,  to
developing hiring and  retention strategies to attract and keep a company's best
employees,  to  building  change  management  programs  for  clients  undergoing
mergers.

Combined Insurance Company of America is a leader in offering supplemental life,
health and accident  coverage.  It also has opened a significant  new channel of
distribution  by  offering  benefits  through  employer  programs.   This  helps
employers  provide  more  cost  efficient  benefits for employees, and in  turn,
increase retention.

Virginia Surety Company and London General Insurance Company offer comprehensive
extended warranty and consumer service programs.

FOCUSED ON CLIENT NEEDS
To always  ensure  that we are acting in the best  interest of our  clients,  we
continue  to  make  changes  to  our   organization.   First,  we  revamped  our
compensation  system in order to foster greater  knowledge  sharing.  Second, we
created global account teams to bring together the right  capabilities  for each
engagement.  Third, we continue to invest heavily in technology. This is already
enabling our organization to act more  efficiently,  and it provides our clients
greater  access to their  data in ways that  help  them  make  smarter  business
decisions.  By continuing to enhance our interdependent  culture,  we are better
able to help our clients anticipate their risks and uncover new opportunities.

                                     - 13 -
<PAGE>
*** PICTURE OMITTED ***

UNCOVERING OPPORTUNITIES

                                     - 14 -
<PAGE>
*** PICTURE OMITTED ***

There  is a universe of opportunity waiting for companies  fast enough and agile
enough to explore it.  But the opportunities  aren't always obvious, and  making
the most of them means confronting  new  risks in different ways.  Aon  combines
deep experience,  global resources  and creative solutions to  enable clients to
take maximum advantage of opportunities.

                                     - 15 -
<PAGE>
A UNIVERSE WAITING FOR EXPLORATION

An airline industry  customer needed a new source of capital.  We found a way to
collateralize  used jet engines to leverage  existing  assets.  A Middle-Eastern
country  wanted to build a toll road,  but their  sources of  financing  worried
about  disruption by  terrorists.  We assessed the risk,  put a value on it, and
placed it in insurance markets. The contruction went forward.

Different  examples,  but one  clear  point.  Understanding  risk does more than
provide  protection.  It creates  opportunity.  It removes  barriers that  often
stand in the way of growth.

Aon  understands  the  relationship  between risk and  opportunity.  We have the
experience,  products,  expertise -- and creativity -- to handle the risk, which
means our clients can focus on the business of growth and profits.

*** PICTURE OMITTED ***

At Aon, there is no unit called the  Opportunity  Division.  There is  no Senior
Vice  President of  Opportunity.  Rather,  we all help companies see and exploit
opportunites.  We combine organizations,  protections and deep lines of business
experience to become an advisor, consultant and advocate for our clients.


                                     - 16 -
<PAGE>
With the coordination  and focus  of  global account management  every  Aon unit
can -- and will -- be a part of that process.

For example,  one of the barriers to  opportunity in e-commerce is protection of
intellectual  property.  Patent  licensing  revenues are expected to exceed $500
billion by 2005 - up from $100 billion in 1998.  When your asset is an idea or a
body of  knowledge,  opportunity  demands a new kind of  protection.  A new risk
transfer  product  developed by Aon will, for the first time, allow companies to
secure  blanket  protection  to recover  damages or enforce  rights for patents,
trademarks, copyrights and other intellectual property assets.

Often,  opportunity  demands thinking outside the boundaries of insurance.  Aon
Capital  Markets is a leader in creating  opportunity  through  insurance-linked
securities. We also provide advisory services to clients who need risk financing
that goes beyond the protection of typical insurance or reinsurance services.

Opportunity  often lies in the ability to change - quickly.  Aon Consulting is a
comprehensive   human  resource   consulting  firm.  In  addition  to  benefits,
retirement and other human resource services,  Aon Consulting can help companies
deal with accelerated, potentially disruptive, changes.

A few examples,  but they illustrate new and important dimensions in the work we
do for  clients.  We have  the  organization  the  information  technology,  the
distribution channels and the focus to create unique opportunities.


                                     - 17 -
<PAGE>

FINANCIAL AND OPERATIONS HIGHLIGHTS
MANAGEMENT'S DISCUSSION AND ANALYSIS

THIS ANNUAL REPORT CONTAINS  FORWARD-LOOKING  STATEMENTS AS THAT TERM IS DEFINED
IN THE  PRIVATE  SECURITIES  LITIGATION  REFORM  ACT OF 1995.  SEE  "INFORMATION
CONCERNING FORWARD-LOOKING STATEMENTS" ON PAGE 54 OF THIS ANNUAL REPORT.

CONSOLIDATED RESULTS
GENERAL
On March 19, 1999,  the Board of  Directors  authorized  a  three-for-two  stock
split, payable in the form of a stock dividend,  of Aon's $1.00 par value common
stock. All references to share data in the accompanying  management's discussion
and analysis and financial  statements reflect the three-for-two stock split. In
the  following  discussion,  the  references to per share data are on a dilutive
basis.

SPECIAL CHARGES
In first  quarter  1999,  Aon recorded  special  charges of $163  million  ($102
million  after-tax or $0.39 per share).  These charges  included  provisions for
restructuring  in the brokerage and other  services and  consulting  segments of
$120 million  (see note 3).  Also,  in the  consulting  segment,  charges of $43
million  were  recorded in first  quarter  1999 to reflect  amounts  required to
compensate customers who switched out of company pension plans in the U.K. based
upon advice  offered by  financial  advisors of current Aon  subsidiaries.  This
advice was given prior to Aon's purchase of these companies (see note 13).

In  fourth  quarter 1999,  Aon  recorded  special charges of  $150  million ($93
million after-tax or $0.35 per share).  These charges  reflect an additional $78
million related to the pension payments described above mainly due to changes in
U.K. government  requirements and $72 million for Unicover  and other litigation
matters (see note 13).

In first quarter 1997, Aon recorded special charges of $145 million ($91 million
after-tax or $0.36 per share), primarily related to management's commitment to a
formal  plan of  restructuring  Aon's  brokerage  operations  as a result of the
acquisition of Alexander and Alexander Services, Inc. (A&A) (see note 3).

In second quarter 1997, Aon recorded special charges of $27 million ($17 million
after-tax or $0.07 per share) to  recognize  investment  losses  incurred at A&A
before Aon acquired A&A.

REVENUE AND INCOME BEFORE INCOME TAX
CONSOLIDATED RESULTS FOR 1999 COMPARED TO 1998
For purposes of the following  consolidated results  discussions,  certain prior
period  information  has  been  reclassified  to  conform  to the  current  year
presentation.

Total  revenues  amounted  to $7.1  billion,  an  increase  of 9% in 1999.  This
increase  was  largely  attributable  to  the  following:  growth  in  brokerage
commissions  and fees  resulting  from  business  combination  activity,  slower
premium rate declines,  growth in insurance premiums resulting from new business
and internal growth in the operating  segments.  Overall,  foreign  exchange and
interest rate  reductions,  the absence of Unicover  revenues in fourth  quarter
1999 and lower  corporate  investment  income on  equity  securities  negatively
impacted revenue growth.

U.S. revenues  increased 11% in 1999 compared to 1998 primarily due to increased
new  business,  acquisitions  and slower  premium  rate  declines  that  benefit
insurance brokerage  commissions.  Insurance  brokerage  commission revenue is a
percentage of total  premiums  placed.  If the rate of pricing  decline slows on
underlying premiums, commission revenue is benefited. European revenue increased
8% to $2.2  billion and Rest of World  revenue of $746  million  increased 3% in
1999 primarily due to acquisitions and new business.  Approximately  30% of 1999
income before income tax is derived from operations outside the U.S.

Brokerage  commissions and fees increased 11% to $4.6 billion  reflecting growth
from business combination activity,  internal growth, increased new business and
slower premium rate declines.

Premiums  and other  revenue  is  primarily  related to  insurance  underwriting
operations  and includes  premiums  earned and other income of $1.9 billion,  an
increase of 9% in 1999.  Extended warranty premiums earned increased $83 million
or  15%,  primarily   reflecting  continued  growth  related  to  appliance  and
electronics  warranty  products.  Direct sales  premiums  earned  increased  $44
million or 4%, reflecting  continued growth from historic levels of accident and
health  revenues.  Specialty  and other  revenue  increased  $28 million or 11%,
primarily  due to the  acquisition of an auto credit book of business in 1999.

Investment  income of $577  million,  which  includes  income on  disposals  and
related expenses decreased 2% for the year. The primary factors  contributing to
this decrease are a reduction in short-term interest rates mostly outside of the
U.S. and lower levels of income from equity securities. Partially offsetting the
investment  income  decline  was income on disposal  of  tax-exempt  bonds (with
proceeds  reinvested in foreign  source income bonds for tax planning  purposes)
and higher levels of income on disposals of certain private equity  investments.
During 1999, investments in limited partnerships and private equities increased.
Limited  partnerships  and private equity  investments do not have fixed returns
and consequently exhibit

                                     - 18 -
<PAGE>
greater variability in investment income. See "Investment Operations."

General expenses increased 17% for the year. The increase reflects the inclusion
of 1999 pretax special charges of $313 million. General expenses,  excluding the
1999 special  charges,  increased over prior year primarily due to the inclusion
of expenses  associated  with the integration of new businesses in 1999, as well
as expenses related to new initiatives,  increased levels of technology spending
in 1999 and a  branding  campaign.  In  addition,  due to the  early  retirement
program in 1999 and  significant  changes in interest  rates,  Aon  revalued its
domestic and U.K. pension plans in 1999 (see note 10). 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.

A 9% increase in benefits to policyholders  when compared to 1998 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.  Interest  expense and  amortization of intangibles  increased 21% and
17%,  respectively,  largely as a result of  acquisitions.

References to income before income tax are before minority  interest  related to
the  issuance of 8.205%  mandatorily  redeemable  preferred  capital  securities
(capital securities) (see note 9).

Income before income tax decreased  $296 million or 32% in 1999 primarily due to
the inclusion of special  charges in 1999.  Excluding  special  charges,  pretax
income grew only 2% or $17 million primarily reflecting costs to integrate Aon's
global network,  increased  technology  expenses and the launching of a branding
campaign.

Fourth quarter revenue  increased 10% to $1.9 billion compared to 1998 primarily
reflecting brokerage business combination activity, slower premium rate declines
and additional new business.  Total  expenses,  excluding 1999 special  charges,
increased  15% to $1.7 billion for the quarter as a result of  acquisitions  and
related costs,  increased  technology  expenses and a branding campaign.  Pretax
income, excluding fourth quarter 1999 special charges,  decreased $49 million or
21% to $190 million.  The decrease in pretax  earnings  before  special  charges
reflects  a decline  in  short-term  investment  income,  less  income on equity
investments,  the  absence of Unicover  revenues,  higher  levels of  technology
spending,  lower  income from certain  insurance  brokerage  and other  services
businesses and higher loss ratios on home warranty claims.

CONSOLIDATED RESULTS FOR 1998 COMPARED TO 1997
Total revenues amounted to $6.5 billion,  an increase of 13% in 1998.  Brokerage
commissions  and fees  increased 16% to $4.2  billion,  largely  resulting  from
business  combination  activity.  Premiums  and other  revenue  of $1.7  billion
increased 4% in 1998, reflecting continued growth primarily related to appliance
and  electronics  warranty  products  and, to a lesser  extent,  the  mechanical
extended  warranty  line.  Direct  sales  premiums  earned  increased  modestly,
reflecting  changes  in the  consumer  insurance  market.  The  run-off of North
American auto credit business  partially  offset this growth in premiums earned.
Investment  income of $590  million  increased  18% for the  year,  attributable
primarily  to  brokerage  acquisitions,  income  from  certain  equity and other
investment holdings,  assets underlying capital accumulation products and higher
levels of income on disposals.

General  expenses  increased  7% for the year  primarily  due to  growth  in the
brokerage  businesses.  Benefits to policyholders  increased 6% when compared to
1997,   reflecting  a  higher  volume  of  new  extended  warranty  and  capital
accumulation business. This increase was partially offset by the run-off of auto
credit  business  as  planned.  Interest  expense  increased  24% as a result of
acquisition  financing.  Amortization of intangibles  increased slightly.

Total  expenses  increased  7% or $353 million  over 1997.  Total 1998  expenses
increased  over  prior  year  primarily  due  to  investments  in  new  business
initiatives,  technology and product development.  Total expenses, excluding the
1997 special  charges,  increased  10% or $525 million over 1997.

Income before income tax increased  $389 million or 72% in 1998 primarily due to
the inclusion of special  charges in 1997.  Excluding  special  charges,  income
before  income tax  increased  30% or $217  million,  largely  due to  brokerage
business combination activity, to the achievement of cost savings resulting from
the consolidation of brokerage  operations during 1998 and 1997, and to internal
growth.

BUSINESS SEGMENTS
For purposes of the following business segments discussions, comparisons of 1999
against 1998 results exclude special charges. Also, a discussion of discontinued
operations  follows the Business Segments section.

Aon's  operating  segments are identified as those for which separate  financial
information  is available  and that are evaluated on a regular basis in deciding
how to allocate resources and in assessing  performance.  Total revenue for each
of the major  operating  segments is presented both by product and

                                     - 19 -
<PAGE>

by geographic area in note 14. Since Aon's culture fosters interdependence among
its operating  units,  the allocation of expenses by product and on a geographic
basis is  difficult  to  delineate.  While  revenue  is  tracked  and  evaluated
separately by management,  expenses are allocated to products within each of the
business  segments.  In  addition  to  revenue,  Aon also  measures a  segment's
financial  performance  based on  business  segment  income  before  income tax.
Revenues  are  attributed  to  geographic  areas  based on the  location  of the
resources producing the revenues.

Aon classifies its businesses  into three major  operating  segments:  Insurance
Brokerage and Other Services,  Consulting and Insurance  Underwriting;  and into
one nonoperating segment, Corporate and Other (see note 14).

All material  intercompany  revenues and  expenses are  eliminated  in computing
consolidated  revenues and income before income tax. A description of operations
and a review of financial  performance  for each of the four  business  segments
follow.

INSURANCE BROKERAGE AND OTHER SERVICES
The Insurance Brokerage and Other Services segment consists principally of Aon's
retail  and  reinsurance  brokerage  operations,  which  include  specialty  and
wholesale activity.

Total 1999 Insurance  Brokerage and Other Services revenue was $4.1 billion,  up
10%. Acquisitions,  new business and diminishing premium rate declines accounted
for the majority of this revenue growth.  Overall,  global insurance  pricing in
retail had a  slightly  negative  impact in 1999 with  selected  improvement  in
reinsurance  pricing.  Excluding the impact of acquisitions and Unicover related
revenue,  commissions  and  fee  revenue  for  brokerage  core  businesses  grew
approximately  6% in a very competitive  environment.  This growth was primarily
due  to  increased  new  business,  specialty  and  reinsurance  operations  and
diminishing premium rate declines.  Revenue includes investment income allocated
to this  operating  segment.  Investment  income in this segment  decreased  $35
million in 1999 compared to prior year primarily due to reductions in short-term
interest rates. See "Investment Operations."

U.S.  revenue of $2.1 billion in 1999 was up 14% from 1998 due to increased  new
business,  acquisitions,  diminishing  premium rate declines and U.S.  specialty
operations.  U.K. and other European  revenue of $1.5 billion  increased 6% from
1998, primarily due to acquisition  activity,  particularly in Italy, France and
the U.K. and to internal growth in the U.K.,  Spain, The  Netherlands,  Finland,
Ireland,  Norway and Belgium.  Rest of World revenue increased  modestly in 1999
primarily due to new initiatives.

Insurance  Brokerage and Other Services segment results were impacted positively
by  acquisitions,  in particular  the Nikols Group  acquisition  in 1999 and the
inclusion of Auto Insurance Specialists,  Le Blanc de Nicolay and Gil y Carvajal
in 1998. Retail brokerage results continued to reflect competitive  property and
casualty  pricing  although  slower  premium rate declines were evident.  Pretax
income growth,  excluding 1999 special charges, was impacted by lower investment
income on short-term funds, acquisition-related integration costs and increased
technology costs. Pretax margins in this segment declined in 1999 reflecting the
above revenue and pretax income growth discussion.

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

In  the  Consulting  segment,   1999  revenue  increased  7%  to  $656  million.
Acquisition activity and internal growth, both domestically and internationally,
influenced revenue growth.  Revenue includes investment income allocated to this
operating  segment.  Excluding the impact of acquisitions and foreign  exchange,
revenue for consulting core businesses grew approximately 9% in 1999.

U.S. revenue of $405 million in 1999 was up 5% from 1998 primarily from employee
benefits and  compensation  services.  U.K. and European revenue of $191 million
increased  12%  from  1998  primarily  reflecting  growth  in the  U.K.  and The
Netherlands.  Rest of World  revenue  increased  3%  primarily  attributable  to
Canada.  Total consulting  pretax income increased $12 million or 18% from prior
year,  reflecting  internal  revenue  growth  mentioned  above and pretax income
margin improvements.

INSURANCE UNDERWRITING
Aon's Insurance Underwriting segment is comprised of direct sales life, accident
and health insurance, extended warranty, specialty and other insurance products.

Revenue was $2.1 billion in 1999, up 8% from 1998.  There was a higher volume of
new business related to appliance and electronics  extended  warranty  products,
both in the U.S. and internationally, as well as in the U.S. mechanical extended
warranty   products  line.   Direct  sales   continued  to  expand  its  product
distribution through work-site marketing programs and the recent introduction of
new product initiatives on a global basis.  However, the above revenue growth is
predominantly  from core operations as these new  initiatives  continue to build
momentum.  Revenue  includes  investment  income  allocated  to  this  operating
segment. See "Investment Operations."

                                     - 20 -
<PAGE>
U.S. revenue of $1.5 billion was up 7% in 1999, mainly due to growth in revenues
for direct sales and the mechanical  extended warranty products.  United Kingdom
and  European  revenue of $464  million  rose 14%,  principally  due to a higher
volume  of new  business  in the  appliance  and  electronic  extended  warranty
products.  Rest of  World  revenue  rose  7%  reflecting  continuing  geographic
expansion.

Pretax income was $290 million in 1999,  up 2% from $283 million last year.  The
completion of the profitable  run-off of specialty  liability business prior to
1999 negatively  influenced pretax income growth this year. Pretax income growth
was also negatively  impacted by worksite marketing and the recent  introduction
of several new direct sales products.  Additionally, there was a modest increase
in the extended warranty loss ratio primarily due to the home warranty appliance
product.  Start-up costs related to new direct sales product initiatives and the
modest increase in the extended  warranty loss ratio partially offset the direct
sales and extended  warranty expense ratio  improvements.  Overall,  benefit and
expense  margins in 1999 did not  suggest  any  significant  shift in  operating
trends.

CORPORATE AND OTHER
Revenue consists  primarily of investment income (including income on disposals)
which is not otherwise  allocated to the  operating  segments.  See  "Investment
Operations."  Corporate  operating  expenses include  administrative and certain
information technology costs.

Revenue  increased  9% or $14 million in 1999  compared  to prior year.  Revenue
growth  was  primarily  influenced  by  approximately  $30  million  of gains on
disposals of  tax-exempt  bonds in 1999 and higher levels of income on disposals
of certain private equity investments.  Private equities are principally carried
at cost and usually earn little income until a disposal occurs.  Lower levels of
income from equity  investments  partially offset revenue growth in the segment.
The timing of revenues from limited  partnerships and private equity investments
varies  significantly  between periods. In particular,  the reported income from
limited  partnership  investments  varies with the market  values of  underlying
publicly-traded equity investments.  See "Investment Operations." The investment
strategy  for the  corporate  segment is to seek  long-term  total  returns from
public  and  private  equities,  including  limited  partnerships  which  exceed
long-term  security  market  rates.  Income  from these  equity  investments  is
expected  to be lower  in the year  2000  than it was in 1999.  The loss  before
income tax  increased  $23 million over 1998.  Contributing  to the loss in 1999
were financing  costs and  goodwill  amortization  related to  acquisitions  and
costs related to  investments  in  information  technology.  Corporate and other
expenses also included costs related to a branding campaign launched in 1999.

DISCONTINUED OPERATIONS
Discontinued   operations  are  composed  of  certain   insurance   underwriting
subsidiaries   acquired   with  A&A  that  are  currently  in  run-off  and  the
indemnification by A&A of certain  liabilities  relating to subsidiaries sold by
A&A prior to Aon's  acquisition.  Management  believes  that,  based on  current
estimates,  these discontinued operations are adequately reserved. The liability
is included as a component of other  liabilities on the consolidated  statements
of financial position.

INCOME TAX AND NET INCOME
Net income for 1999 was $352 million or $1.33 per share compared to $541 million
or $2.07 per share in 1998.  Net income for fourth  quarter 1999 amounted to $13
million or $0.05 per share compared to $139 million or $0.53 per share for 1998.
The  decrease  in 1999 net income and  related  per share  amount is  influenced
primarily by 1999  after-tax  special  charges of $195 million ($0.74 per share)
with no  comparable  amount in 1998.  Basic net income on a per share  basis was
$1.35 and  $2.11 in 1999 and 1998,  respectively.  Dividends  on the  redeemable
preferred  stock in 1999 and 1998 have been deducted from net income to compute
income per share.

Net income excluding special charges was $547 million or $2.07 per share in 1999
compared to $541 million or $2.07 per share in 1998.  The  effective  income tax
rate increased to 38.3% in 1999 from 37.5% in 1998 due  principally to 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 1999
increased  1% when  compared  to 1998  primarily  due to the  issuance of common
shares for  acquisition  financing and, to a lesser  extent,  for employee stock
compensation plans.

LIQUIDITY
Aon's operating subsidiaries anticipate that there will be adequate liquidity to
meet their needs in the foreseeable  future.  Aon's routine  liquidity needs are
primarily  for  servicing  its debt and for the  payment of  dividends  on stock
issues and the capital  securities.  Dividends from Aon's  subsidiaries  are the
primary  source for  meeting  these  requirements.  After  meeting  its  routine
dividend and debt servicing  requirements,  Aon used a majority of the remaining
dividends  received  throughout  the year to invest in  acquisitions  within the
operational   segments  of  its   businesses.   There  are  certain   regulatory
restrictions  relating to dividend  capacity of insurance  subsidiaries that are
discussed in note 9. Insurance subsidiaries' statutory capital

                                     - 21 -
<PAGE>
and surplus at year-end 1999 again exceeded the risk-based capital target set by
the National Association of Insurance Commissioners by a satisfactory level.

The businesses of Aon's operating  subsidiaries  continue to provide substantial
positive cash flow.  Brokerage cash flow has been used primarily for acquisition
related  activities.  Given Aon's  fixed-maturity  portfolio average life of 6.2
years,  access to lines of credit  and Aon's  positive  cash flow,  Aon  expects
sufficient cash flow to meet both short-term and long-term cash needs.

Cash flow from operations decreased $402 million from 1998 to $462 million. This
decrease  primarily  represents  the  timing  of  the  settlement  of  brokerage
receivables  and  payables,  income  taxes and a  branding  campaign.  Excluding
changes in net brokerage  insurance  premiums payable and taxes,  operating cash
increased in 1999 over 1998.

Investing activities used cash of $493 million in 1999, which was made available
from  financing and operating  activities.  Cash used for brokerage  acquisition
activity during 1999 was $395 million. Aon also acquired insurance  underwriting
blocks of business for $50 million in 1999.

Financing  activities in 1999  provided  cash  totaling  $152 million.  This was
primarily  due to the issuance of $250 million 6.9% debt  securities in 1999 and
offset in part by the redemption of Aon's $100 million  6.875% debt  securities.
Net short-term  borrowing  issuances of $408 million in 1999 principally reflect
funds  provided for general  corporate  purposes.  The net cash  withdrawn  from
capital  accumulation product deposits and withdrawals was $130 million in 1999,
primarily  due to a  reduction  in  funding  agreements.  Cash  was used to pay
dividends of $207 million on common stock and $3 million on redeemable preferred
stock.

Total  assets  increased  $1.4  billion  to $21.1  billion.  Invested  assets at
December 31, 1999 decreased $268 million from year-end 1998 levels,  principally
reflecting  declines  in  the  market  value  of  fixed  maturities  and  equity
securities.  Insurance  brokerage  and  consulting  receivables  increased  $807
million in 1999 with a comparable increase in insurance premiums payable.

Aon's  consolidated  statement of financial  position contains a general expense
liability of $146 million related to purchase related restructuring  liabilities
(see note 3). Aon anticipates that all outstanding  termination benefits will be
settled in 2000. The remaining  items  primarily  reflect lease  obligations and
will  run-off  over a period up to 15 years.  Aon does not  anticipate  that the
payment for  termination  benefits  and lease  obligations  will have a material
impact on cash flows in subsequent periods.

In addition, at December 31, 1999, Aon has general expense liabilities (see note
13) for the settlement of various contingencies  regarding U.K. pension selling,
Unicover related settlements and other litigation matters totaling $179 million.
Aon anticipates the settlement of the liabilities  relating to the U.K.  pension
selling  to be  disbursed  over the next few years.  A portion  of the  Unicover
matter has been settled in January 2000 for $27 million.  The remaining Unicover
issues are complex and, therefore, the timing of resolution cannot be determined
at this time.

IMPACT OF YEAR 2000
In prior  years,  Aon  discussed  the nature and progress of its plans to become
Year 2000 ready.  In late 1999,  Aon  completed its  remediation  and testing of
systems.  As  a  result  of  those  planning  and  implementation  efforts,  Aon
experienced  no  significant   disruptions  in  mission   critical   information
technology  and  non-information  technology  systems and believes those systems
successfully  responded to the Year 2000 date change. As projected,  Aon's total
Year  2000  remediation  costs for all  business  units  was  approximately  $70
million,  of which  approximately  $27 million was expended  during 1999.  These
costs were funded through  business unit operating cash flows.  Aon is not aware
of any  material  problems  resulting  from Year 2000  issues,  either  with its
products,  its internal  systems or the products and services of third  parties.
Aon will  continue to monitor its mission  critical  computer  applications  and
those of its suppliers and vendors  throughout  the year 2000 to ensure that any
latent Year 2000 matters that may arise are addressed promptly.

INVESTMENT OPERATIONS
Aon invests in broad asset  categories  related to its  diversified  operations.
Investments  are  managed  with  the  objective  of  maximizing  earnings  while
monitoring   asset  and   liability   durations   and   considering   regulatory
requirements.

Aon maintains  well-capitalized  operating companies.  The financial strength of
these companies permits a diversified  investment  portfolio  including invested
cash, fixed income obligations and public and private equities.

Investment  characteristics  mirror liability  characteristics of the respective
operating  units.  Aon's  insurance  brokerage and other services and consulting
businesses   invest   fiduciary   funds  and  operating  funds  in  shorter-term
obligations,  and income  derived  from these  investments  is  allocated to the
revenues of those businesses.  Investments underlying interest-sensitive

                                     - 22 -
<PAGE>
capital   accumulation   insurance   products   are   fixed-  or   floating-rate
fixed-maturity  obligations to match the appropriate liability  characteristics.
Indemnity and other types of non-interest  sensitive  insurance  liabilities are
primarily  supported by  intermediate to long-term  fixed-maturity  instruments.
Income from fixed-maturity  investments  underlying these insurance products and
liabilities is allocated to revenues of the insurance underwriting segment.

Invested assets and related  investment  income not directly required to support
insurance brokerage, consulting and underwriting businesses are allocated to the
corporate segment. These diversified assets, which are publicly-traded equities,
as well as less liquid private  equities and limited  partnerships,  represent a
more  aggressive  investment  strategy that provides an opportunity  for greater
returns with a longer-term  investment horizon. Many of the limited partnerships
in which Aon invests  have  significant  holdings in  publicly-traded  equities.
Changes in market value of these equities flow through the income of the limited
partnerships.  Aon's ownership share of this  partnership  income is included in
Aon's reported  corporate  investment  income. By comparison,  changes in market
value of  directly-held,  publicly-traded  equities  are  recorded  directly  in
stockholders'  equity. The investment strategy employed in the corporate segment
leads  to  greater  variability  in  investment  income  than  is  the  case  of
investments  supporting the insurance  brokerage,  consulting  and  underwriting
businesses.

With a  carrying  value of $2.5  billion  at  December  31,  1999,  Aon's  total
fixed-maturity  portfolio is invested  primarily in  investment  grade  holdings
(95%) and has a fair value which is 96% of amortized cost.

INVESTED ASSETS

(millions)        As of December 31       1999     1998
- - - - - - - - - - - - - - - - - --------------------------------------------------------
Short-term investments                 $ 2,362  $ 2,221
Fixed maturities                         2,497    3,103
Equity securities                          574      768
Other*                                     751      360
- - - - - - - - - - - - - - - - - --------------------------------------------------------
Total invested assets                  $ 6,184  $ 6,452
- - - - - - - - - - - - - - - - - --------------------------------------------------------
* Limited partnerships were $465 million and $255 million
as of December 31, 1999 and 1998, respectively.


INVESTMENT INCOME

(millions)  Years ended December 31             1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Insurance brokerage and other
   services (primarily short-term
   investments)                                $ 159       $ 194       $ 163
Consulting                                         3           6           6
Insurance underwriting
   (primarily fixed maturities)                  251         240         214
Corporate and other                              164         150         117
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Total investment income                        $ 577       $ 590       $ 500
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

MARKET RISK EXPOSURE
Aon  is  subject  to  market  risk   exposures  of  varying   correlations   and
volatilities,  including  foreign  exchange  rate risk,  interest  rate risk and
equity  price  risk.  The  following  disclosure  reflects  estimates  of future
performance and economic conditions. Actual results may differ.

Aon is  subject  to  foreign  exchange  rate risk  associated  with  translating
financial   statements   of  its  foreign   subsidiaries   into  U.S.   dollars.
Additionally,   certain  of  Aon's  foreign  subsidiaries  receive  revenues  in
currencies that differ from the currency in which their  operating  expenses are
denominated.  Aon's primary  exposures are  associated  with the British  Pound,
other European  currencies,  the Canadian Dollar and the Australian  Dollar. Aon
uses forward contracts and  over-the-counter  options, as well as listed foreign
currency  futures and options on futures to protect against adverse  transaction
and  translation  effects  due to  exchange  rate  fluctuations.  The  potential
decrease  to Aon's  consolidated  stockholders'  equity  at  December  31,  1999
resulting from a  hypothetical  10% adverse  change in quoted  year-end  foreign
currency exchange rates amounts to $136 million and $130 million,  respectively,
at December 31, 1999 and 1998.  The impact to 1999 and 1998 pretax income in the
event of a hypothetical  10% adverse change in the  respective  quoted  year-end
exchange  rates  would  not  be  material  after   consideration  of  derivative
positions.

Due to the  nature of Aon's  businesses,  operating  earnings  are  affected  by
changes in international and domestic  short-term interest rates. Aon hedges its
net  exposure  in  short-term  interest  rates  on  short-term  investments  and
short-term borrowings with Eurodollar,  Eurosterling, EURIBOR futures contracts,
interest  rate swaps and  interest  rate caps.  A  hypothetical  1%  decrease in
interest  rates would  cause a  decrease,  net of  derivative  positions,  of $8
million and $16 million to 1999 and 1998 pretax income, respectively.

                                     - 23 -
<PAGE>
The  valuation of Aon's  fixed-maturity  portfolio  is subject to interest  rate
risk. Aon generally uses treasury options and futures and interest rate swaps to
hedge the value of the fixed-maturity  portfolio.  A hypothetical 1% increase in
long-term  interest  rates would  decrease  the fair value of the  portfolio  at
December 31, 1999 and 1998, net of derivative  positions,  by approximately $121
million and $133  million,  respectively.  Aon has  long-term  notes payable and
capital securities outstanding with a fair value of $1.8 billion at December 31,
1999 and 1998.  Such fair value was greater than (less than) the carrying  value
by ($18 million) and $125 million at December 31, 1999 and 1998, respectively. A
hypothetical  1%  decrease in interest  rates would  increase  the fair value by
approximately 10% at December 31, 1999 and 1998.

The valuation of Aon's  marketable  equity  portfolio is subject to equity price
risk.  If market  prices  were to  decrease  10%,  the fair  value of the equity
portfolio would have a corresponding  decrease, net of derivative positions,  of
$57 million at December  31, 1999  compared to $77 million at December 31, 1998.
At December 31, 1999 and 1998, there were no outstanding derivatives hedging the
price risk on the equity portfolio.

The  selection of the ranges of values  chosen to  represent  changes in foreign
currency  exchange rates,  equity market prices and interest rates should not be
construed  as  Aon's   prediction  of  future  market  events,   but  rather  an
illustration of the impact of such events.  The range of changes chosen reflects
Aon's view of changes, which are reasonably possible over a one-year period.

In 1999, Aon addressed and  implemented the system  modifications  necessary for
full  conversion to the Euro. The Euro conversion did not have a material impact
on Aon's European operations.

CAPITAL RESOURCES
At December 31, 1999, Aon had back-up lines of credit  available of $1.1 billion
to support Aon's commercial paper that was $844 million at December 31, 1999. In
order to achieve tax efficient financing, Aon Corporation  established,  in June
1998, a committed bank credit facility under which certain European subsidiaries
can borrow up to a maximum of $405 million on a revolving  basis. As of December
31, 1999, there were loans totaling $351 million outstanding under the facility.
A total of $292 million is committed for five years and $59 million is committed
for 364 days. Short-term borrowings increased $402 million in 1999 when compared
to 1998 attributable to additional commercial paper issued for general corporate
purposes.  Notes  payable  increased  in 1999 by $88  million  when  compared to
year-end 1998. The principal  factor  influencing this increase was the issuance
of $250  million  6.9% debt  securities  due July  2004 (see note 6).  Partially
offsetting  the increase was the  redemption  of Aon's $100 million  6.875% debt
securities,  due October 1, 1999,  which were  redeemed at 100% of the principal
amount plus accrued  interest and the impact of foreign  exchange on outstanding
loans under the European bank credit facility.

Aon Corporation borrows funds from and lends funds to its various  subsidiaries.
As of December 31, 1999, Aon Corporation held obligations to its subsidiaries of
approximately $600 million. These obligations have competitive interest rates.

In 1999,  common  stockholders'  equity per share  increased to $11.91,  up from
$11.83 in 1998. The principal factors  influencing this increase were net income
(which  includes  $195 million of after-tax  special  charges) and a $60 million
decrease in the additional  minimum pension  liability  related to U.K.  pension
plans.  Offsetting this increase were net unrealized  investment  losses of $199
million,   net  foreign   exchange  losses  of  $54  million  and  dividends  to
stockholders of $210 million.  Fluctuations in unrealized  investment  gains and
losses and foreign  exchange  gains and losses from period to period are largely
based on market conditions.

                                     - 24 -
<PAGE>

CONSOLIDATED STATEMENTS OF INCOME

(millions except per share data) Years ended December 31   1999    1998    1997
================================================================================
REVENUE
   Brokerage commissions and fees                       $ 4,639 $ 4,197 $ 3,605
   Premiums and other                                     1,854   1,706   1,646
   Investment income (note 5)                               577     590     500
                                                        ------------------------
            Total revenue                                 7,070   6,493   5,751
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
EXPENSES
   General expenses (notes 3 and 13)                      5,214   4,457   4,176
   Benefits to policyholders                                973     896     842
   Interest expense                                         105      87      70
   Amortization of intangible assets                        143     122     121
                                                        ------------------------
            Total expenses                                6,435   5,562   5,209
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
INCOME BEFORE INCOME TAX AND MINORITY INTEREST              635     931     542
      Provision for income tax (note 7)                     243     349     203
                                                        ------------------------
INCOME BEFORE MINORITY INTEREST                             392     582     339
   Minority interest, net of tax--Company-obligated
      mandatorily redeemable preferred capital
      securities (note 9)                                   (40)    (41)    (40)
                                                        ------------------------
NET INCOME                                               $  352  $  541  $  299
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
NET INCOME AVAILABLE FOR COMMON STOCKHOLDERS             $  349  $  538  $  287
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

BASIC NET INCOME PER SHARE                               $ 1.35  $ 2.11  $ 1.14
DILUTIVE NET INCOME PER SHARE                              1.33    2.07    1.12

CASH DIVIDENDS PER SHARE PAID ON COMMON STOCK            $ 0.82  $ 0.73  $ 0.68
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
DILUTIVE AVERAGE COMMON AND COMMON EQUIVALENT
   SHARES OUTSTANDING                                     262.7   259.4   255.8
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
See accompanying notes to consolidated financial statements.

                                     - 25 -
<PAGE>

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

(millions)                             As of December 31    1999           1998
================================================================================
ASSETS

INVESTMENTS
  Fixed maturities--at fair value                       $  2,497       $  3,103
  Equity securities--at fair value                           574            768
  Short-term investments                                   2,362          2,221
  Other investments                                          751            360
                                                        ------------------------
      Total investments                                    6,184          6,452

- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

CASH                                                         837            723

RECEIVABLES
  Insurance brokerage and consulting                       6,230          5,423
  Premiums and other                                       1,116          1,183
                                                        ------------------------
      Total receivables (net of allowance for doubtful
        accounts: 1999--$94; 1998--$99)                    7,346          6,606

- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

CURRENT INCOME TAXES                                          73             --

DEFERRED INCOME TAXES                                        270            214

DEFERRED POLICY ACQUISITION COSTS                            636            573

EXCESS OF COST OVER NET ASSETS PURCHASED
  (net of accumulated amortization:
     1999--$466; 1998--$364)                               3,359          3,006

OTHER INTANGIBLE ASSETS
   (net of accumulated amortization:
     1999--$779; 1998--$738)                                 503            494

OTHER ASSETS                                               1,924          1,620

- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
TOTAL ASSETS                                            $ 21,132       $ 19,688
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
See accompanying notes to consolidated financial statements.

                                     - 26 -
<PAGE>

(millions)                             As of December 31    1999           1998
================================================================================
LIABILITIES AND STOCKHOLDERS' EQUITY

INSURANCE PREMIUMS PAYABLE                              $  7,643       $  6,948

POLICY LIABILITIES
      Future policy benefits                               1,005            986
      Policy and contract claims                             764            779
      Unearned and advance premiums                        2,012          1,797
      Other policyholder funds                             1,207          1,261
                                                        ------------------------
             Total policy liabilities                      4,988          4,823

GENERAL LIABILITIES
      General expenses                                     1,731          1,448
      Current income taxes                                    --            156
      Short-term borrowings                                  903            501
      Notes payable                                        1,011            923
      Other liabilities                                      955          1,022
                                                        ------------------------
   TOTAL LIABILITIES                                      17,231         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
            Authorized--300 shares; issued                   259            172
      Paid-in additional capital                             525            450
      Accumulated other comprehensive loss                  (309)          (116)
      Retained earnings                                    2,905          2,782
      Treasury stock at cost (shares: 1999--2.7; 1998--2.3)  (90)           (58)
      Deferred compensation                                 (239)          (213)
                                                        ------------------------
   TOTAL STOCKHOLDERS' EQUITY                              3,051          3,017
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
   TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY           $ 21,132       $ 19,688
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

                                     - 27 -
<PAGE>

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

(millions)             Years Ended December 31             1999    1998    1997
================================================================================
COMMON STOCK  Balance at January 1                       $  172   $ 172  $  114
   Effect of three-for-two stock split                       86      --      57
   Shares issued for business combinations                    1      --       1
                                                         -----------------------
                                                            259     172     172
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
PAID-IN ADDITIONAL CAPITAL  Balance at January 1            450     377     475
   Effect of three-for-two stock split                      (86)     --     (57)
   Employee benefit plans                                   114      73      79
   Business combinations                                     47      --      11
   Retirement and conversion of preferred stock              --      --    (131)
                                                         -----------------------
                                                            525     450     377
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
  Balance at January 1                                     (116)    103     154
   Net unrealized investment gains (losses)                (199)   (111)     36
   Net foreign exchange losses                              (54)    (12)    (87)
   Net additional minimum pension liability adjustment       60     (96)     --
                                                         -----------------------
   Other comprehensive loss                                (193)   (219)    (51)
                                                         -----------------------
                                                           (309)   (116)    103
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
RETAINED EARNINGS  Balance at January 1                   2,782   2,463   2,357
   Net income                                               352     541     299
   Dividends to stockholders                               (210)   (194)   (180)
   Loss on treasury stock reissued                          (19)    (30)     (7)
   Adjustment for business combinations                      --       2      (6)
                                                         -----------------------
                                                          2,905   2,782   2,463
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
TREASURY STOCK  Balance at January 1                        (58)    (93)   (121)
   Cost of shares acquired                                 (105)    (44)    (12)
   Shares reissued at average cost                           73      79      40
                                                         -----------------------
                                                            (90)    (58)    (93)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
DEFERRED COMPENSATION  Balance at January 1                (213)   (200)   (151)
   Issuance of stock awards                                 (73)    (54)    (81)
   Debt guarantee of employee stock ownership plan           17      16      13
   Amortization of deferred compensation                     30      25      19
                                                         -----------------------
                                                           (239)   (213)   (200)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
PREFERRED STOCK  Balance at January 1                        --      --       5
   Retirement and conversion of preferred stock              --      --      (5)
                                                         -----------------------
                                                             --      --      --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
STOCKHOLDERS' EQUITY AT DECEMBER 31                     $ 3,051 $ 3,017 $ 2,822
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

COMPREHENSIVE INCOME
   NET INCOME                                           $   352 $   541 $   299
   OTHER COMPREHENSIVE LOSS (NOTE 2)                       (193)   (219)    (51)
                                                        ------------------------
      COMPREHENSIVE INCOME                              $   159 $   322 $   248
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
See accompanying notes to consolidated financial statements.

                                     - 28 -
<PAGE>

CONSOLIDATED STATEMENTS OF CASH FLOWS

(millions)             Years Ended December 31             1999    1998    1997
================================================================================
Cash Flows from Operating Activities
   Net income                                           $   352 $   541 $   299
   Adjustments to reconcile net income to cash
     provided by operating activities
      Policy liabilities                                    222      28    (155)
      Deferred policy acquisition costs                    (239)   (236)   (164)
      Amortization of deferred policy acquisition costs     247     216     208
      Amortization of intangible assets                     143     122     121
      Other amortization                                     25      15      14
      Depreciation of property and equipment                187     131     107
      Income taxes                                         (106)     75      42
      Brokerage insurance premiums payable--net             (40)    220     380
      Other                                                (329)   (248)    (68)
                                                         -----------------------
         CASH PROVIDED BY OPERATING ACTIVITIES              462     864     784
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
CASH FLOWS FROM INVESTING ACTIVITIES
   Sale of investments
      Fixed maturities
         Maturities                                          80     107     105
         Calls and prepayments                              160     108     156
         Sales                                            1,152   2,062   2,175
      Equity securities                                     461   2,176   1,827
      Other investments                                     114      51      55
   Purchase of investments
      Fixed maturities                                     (959) (2,257) (2,767)
      Equity securities                                    (385) (2,253) (1,724)
      Other investments                                    (357)   (141)   (111)
   Purchase of short-term investments--net                  (93)   (534)    (31)
   Acquisition of subsidiaries                             (395)   (374) (1,649)
   Acquired fiduciary funds from acquisitions                --      --     734
   Property and equipment and other                        (271)   (300)   (146)
                                                         -----------------------
         CASH USED BY INVESTING ACTIVITIES                 (493) (1,355) (1,376)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Cash Flows from Financing Activities
   Treasury stock transactions--net                         (66)    (18)     21
   Issuance of short-term borrowings--net                   408      80     542
   Issuance of mandatorily redeemable preferred
     capital securities                                      --      --     800
   Issuance of long-term debt                               250      --      --
   Repayment of long-term debt                             (100)    (34)    (74)
   Interest sensitive, annuity and investment-type contracts
      Deposits                                              444     435     373
      Withdrawals                                          (574)   (137)    (44)
   Retirement of preferred stock                             --      --    (136)
   Cash dividends to stockholders                          (210)   (194)   (182)
                                                         -----------------------
         CASH PROVIDED BY FINANCING ACTIVITIES              152     132   1,300
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
   EFFECT OF EXCHANGE RATE CHANGES ON CASH                   (7)     (3)    (33)
   INCREASE (DECREASE) IN CASH                              114    (362)    675
   CASH AT BEGINNING OF YEAR                                723   1,085     410
                                                         -----------------------
CASH AT END OF YEAR                                     $   837 $   723 $ 1,085
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
See accompanying notes to consolidated financial statements.

                                     - 29 -
<PAGE>
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1  SUMMARY OF SIGNIFICANT ACCOUNTING PRINCIPLES AND PRACTICES
================================================================================

PRINCIPLES OF CONSOLIDATION
The  accompanying  consolidated  financial  statements  have  been  prepared  in
conformity with accounting  principles  generally  accepted in the United States
and  include the  accounts of Aon  Corporation  and its  operating  subsidiaries
(Aon).  These statements  include informed estimates and assumptions that affect
the amounts reported. Actual results could differ from the amounts reported. All
material intercompany accounts and transactions have been eliminated.

BROKERAGE COMMISSIONS AND FEES
In  general,  commission  income is  recognized  at the later of the  billing or
effective  date  of the  related  insurance  policies.  Contingent  commissions,
certain life insurance  commissions  and commissions on premiums billed directly
by  insurance  companies  are  generally  recognized  as income  when  received.
Commissions  on  premium  adjustments,   including  policy  cancellations,   are
recognized  as they  occur.  Fees for  claim  administration  services,  benefit
consulting,  reinsurance  services and other  services are  recognized  when the
services are rendered.

PREMIUM REVENUE
In general,  for accident and health and extended  warranty  products,  premiums
collected are reported as earned in proportion to insurance  protection provided
over the  period  covered  by the  policies.  For life  products,  premiums  are
recognized as revenue when due.

For  universal  life-type  and  investment  products,   generally  there  is  no
requirement  for payment of premium other than to maintain  account  values at a
level  sufficient to pay mortality and expense charges.  Consequently,  premiums
for universal  life-type  policies and  investment  products are not reported as
revenue,  but as deposits.  Policy fee revenue for universal  life-type policies
and investment  products  consists of charges for the cost of insurance,  policy
administration  and  surrenders  assessed  during the period.  Expenses  include
interest  credited to policy  account  balances and benefit  claims  incurred in
excess of policy account balances.

REINSURANCE
Reinsurance  premiums,  commissions  and  expense  reimbursements  on  reinsured
business are accounted for on a basis  consistent  with those used in accounting
for the original  policies  issued and the terms of the  reinsurance  contracts.
Premiums and benefits ceded to other companies have been reported as a reduction
of premium revenue and benefits.  Expense reimbursements  received in connection
with  reinsurance  ceded have been  accounted  for as a reduction of the related
policy  acquisition  costs or, to the  extent  such  reimbursements  exceed  the
related acquisition costs, as other revenue. Reinsurance receivables and prepaid
reinsurance premium amounts are reported as assets.

STOCK COMPENSATION PLANS
Aon applies  Accounting  Principles Board Opinion No. 25,  "Accounting for Stock
Issued  to  Employees,"  and  related  interpretations  in  accounting  for  its
stock-based  compensation plans.  Accordingly,  no compensation expense has been
recognized  for its  stock  option  plan as the  exercise  price of the  options
equaled the market price of the stock at the date of grant. Compensation expense
has been  recognized  for the Aon Stock Award Plan based on the market  price at
the date of the award.

INCOME TAX
Deferred  income tax has been provided for the effects of temporary  differences
between financial reporting and tax bases of assets and liabilities and has been
measured  using the enacted  marginal  tax rates and laws that are  currently in
effect.

INCOME PER SHARE
Basic  income  per share is  computed  based on the  weighted-average  number of
common shares outstanding, excluding any dilutive effects of options, awards and
convertible  securities.  Net income available for common stockholders is net of
all  preferred  dividends.  Dilutive  income per share is computed  based on the
weighted-average number of common shares outstanding plus the dilutive effect of
options, awards and convertible  securities.  The dilutive effect of options and
awards is calculated  under the treasury  stock method using the average  market
price for the period. Income per share is calculated as follows:


(millions except per share data)                   1999        1998        1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net income                                       $  352      $  541      $  299
8% preferred stock dividends                         --          --          (9)
Redeemable preferred stock dividends                 (3)         (3)         (3)
                                                 -------------------------------
Net income for dilutive and basic                $  349      $  538      $  287
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Basic shares outstanding                            259         255         252
Common stock equivalents                              4           4           4
                                                 -------------------------------
Dilutive potential common shares                    263         259         256
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Dilutive net income per share                    $ 1.33      $ 2.07      $ 1.12
Basic net income per share                       $ 1.35      $ 2.11      $ 1.14
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

                                     - 30 -
<PAGE>
A  three-for-two  stock split of Aon's $1.00 par value common stock was effected
on May 17, 1999 with 86 million shares issued to common  stockholders  of record
as of May 4, 1999. All  references in the  accompanying  consolidated  financial
statements  and notes to the number of common  shares and per share amounts have
been retroactively restated to reflect the stock split.

INVESTMENTS
Fixed-maturity  securities are available for sale and are carried at fair value.
The amortized cost of fixed  maturities is adjusted for amortization of premiums
to the first call date and the  accretion  of  discounts  to  maturity  that are
included in  investment  income.  Marketable  equity  securities,  that are held
directly,  are carried at fair value.  Unrealized gains and temporary unrealized
losses on fixed  maturities  and equity  securities are excluded from income and
are recorded directly to stockholders' equity in accumulated other comprehensive
loss, net of related  deferred income taxes.  Mortgage  loans,  policy loans and
private equity  investments  are generally  carried at cost or unpaid  principal
balance.

Limited partnership investments are carried under the equity method. Many of the
limited   partnerships  in  which  Aon  invests  have  significant  holdings  in
publicly-traded equities. Changes in market value of these equities flow through
the  income  of  the  limited  partnerships.  Aon's  ownership  share  of  this
partnership income is included in Aon's reported corporate investment income.

Income or loss on disposal of any  securities  held in the portfolio is computed
using specific costs of securities sold and reported as investment income in the
consolidated financial statements.

Investments  that have declines in fair value below cost, which are judged to be
other than  temporary,  are written down to estimated fair values.  Reserves for
certain  other  investments  are  established  based  on an  evaluation  of  the
respective investment portfolio and current economic conditions.  Writedowns and
changes in  reserves  are  included  in  investment  income in the  consolidated
statements of income.  In general,  Aon ceases to accrue investment income where
interest or dividend payments are in arrears.

Accounting policies relating to derivative  financial  instruments are discussed
in note 12.

DEFERRED POLICY ACQUISITION COSTS
Costs of acquiring new and renewal insurance underwriting business,  principally
the excess of new commissions over renewal  commissions,  underwriting and sales
expenses  that vary with and are  primarily  related  to the  production  of new
business, are deferred and reported as assets. For long-duration life and health
products,  amortization of deferred policy  acquisition  costs is related to and
based on the  expected  premium  revenues  of the  policies.  In  general,  such
amortization  is adjusted to reflect  current  withdrawal  experience.  Expected
premium  revenues are estimated by using the same assumptions used in estimating
future  policy  benefits.   For  extended  warranty  and  short-duration  health
insurance,  costs of acquiring and renewing  business,  which are deferred,  are
amortized as the related premium is earned.

INTANGIBLE ASSETS
In general,  the excess of cost over net assets  purchased  relating to business
acquisitions  is being amortized into income over periods not exceeding 40 years
using the straight-line  method,  with a weighted-average  life of 37 years. The
cost of  other  intangible  assets  is being  amortized  over a range of 4 to 25
years, with a weighted-average life of 18 years.

In the unexpected event of a significant  deterioration in profitability that is
expected to be recurring,  Aon would assess the recoverability of its intangible
assets using the undiscounted cash flow method.

PROPERTY AND EQUIPMENT
Property and  equipment,  reported in other assets,  are  generally  depreciated
using the  straight-line  method over their estimated useful lives.  Included in
this  category is internal  use  software,  which is software  that is acquired,
internally  developed or modified solely to meet internal needs, with no plan to
market externally. Costs related to directly obtaining,  developing or upgrading
internal use software are capitalized. These costs are generally amortized using
the straight-line method over a range of 2 to 8 years. The weighted-average life
of Aon's software at December 31, 1999 is 5.4 years.

FAIR VALUE OF FINANCIAL INSTRUMENTS
The  following  methods and  assumptions  were used to estimate  fair values for
financial  instruments.  The carrying amounts in the consolidated  statements of
financial  position  for  cash  and  cash  equivalents,   including   short-term
investments,  approximate  their fair value. Fair value for  fixed-maturity  and
equity  securities is based on quoted market prices or, if they are not actively
traded,  on estimated values obtained from independent  pricing  services.  Fair
value of derivatives is based on quoted prices for  exchange-traded  instruments
or the cost to terminate or offset with other contracts.

                                     - 31 -
<PAGE>
Other investments are comprised of mortgage loans, policy loans,  private equity
investments  and limited  partnerships.  The fair value for  mortgage  loans and
policy loans is estimated using  discounted  cash flow analyses,  using interest
rates currently being offered for similar loans to borrowers with similar credit
ratings.  It is not  practical  to  estimate  the fair value of  private  equity
investments and limited partnerships without incurring excessive costs.

Fair value for  liabilities  for  investment-type  contracts is estimated  using
discounted  cash flow  calculations  based on  interest  rates  currently  being
offered for similar  contracts with  maturities  consistent with those remaining
for the  contracts  being  valued.  The fair value for notes payable is based on
quoted  market  prices for the  publicly-traded  portion and on estimates  using
discounted cash flow analyses based on current borrowing rates for similar types
of borrowing arrangements for the nonpublicly-traded portion.

FUTURE POLICY BENEFITS, POLICY AND CONTRACT CLAIMS AND UNEARNED PREMIUMS
Future policy benefit  liabilities on non-universal life and accident and health
products have been provided on the net level premium method. The liabilities are
calculated based on assumptions as to investment yield, mortality, morbidity and
withdrawal  rates that were  determined  at the date of issue,  and  provide for
possible adverse deviations. Interest assumptions are graded and range from 4.5%
to 7.0% at December 31, 1999.  Withdrawal  assumptions are based  principally on
insurance subsidiaries' experience and vary by plan, year of issue and duration.

Policyholder liabilities on universal life and investment products are generally
based on policy account  values.  Interest credit rates for these products range
from 5.2% to 8.4%.

Policy and contract claim liabilities  represent  estimates for reported claims,
as well as provisions  for losses  incurred,  but not yet reported.  These claim
liabilities are based on historical experience and are estimates of the ultimate
amount  to be paid  when  the  claims  are  settled.  Changes  in the  estimated
liability are reflected in income as the estimates are revised.

Unearned  premiums  generally are calculated  using the pro rata method based on
gross premiums. However, in the case of extended warranty products, the unearned
premiums  are  calculated  such that the  premiums are earned over the period of
risk in a reasonable relationship to anticipated claims.

FOREIGN  CURRENCY TRANSLATION
In  general,  foreign revenues and expenses are translated at  average  exchange
rates. Foreign assets and liabilities are translated at year-end exchange rates.
Net foreign  exchange  gains and  losses on  translation  are generally reported
in  stockholders' equity,  in  accumulated  other  comprehensive  loss,  net  of
deferred  income  tax.

ACCOUNTING AND DISCLOSURE CHANGES
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 the consolidated financial
statements.

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.

In December  1999, the  Securities  and Exchange  Commission  (SEC) issued Staff
Accounting Bulletin (SAB) No. 101 which provides guidance for applying generally
accepted accounting  principles relating to the timing of revenue recognition in
financial  statements filed with the SEC. Any change required by the SAB must be
made in the first quarter 2000 with a cumulative effect accounting  change.  Aon
has  not  yet  determined  the  effect,  if  any,  this  SAB  will  have  on the
consolidated financial statements.

RECLASSIFICATION
Certain  amounts in prior years'  consolidated  financial  statements  have been
reclassified to conform to the 1999 presentation.

                                     - 32 -
<PAGE>

2  COMPREHENSIVE INCOME
================================================================================

The  components of other  comprehensive  loss and the related tax effects are as
follows:
                                            Amount      Income Tax       Amount
Year ended December 31, 1999                Before       (Expense)       Net of
(millions)                                   Taxes         Benefit        Taxes
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Unrealized holding losses arising
   during the year                          $ (263)         $   92       $ (171)
Less: reclassification adjustment               45             (17)          28
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net unrealized investment losses              (308)            109         (199)
Net foreign exchange losses                    (89)             35          (54)
Net additional minimum pension
   liability adjustment                         95             (35)          60
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
   Total other comprehensive loss           $ (302)         $  109       $ (193)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

                                            Amount      Income Tax       Amount
Year ended December 31, 1998                Before       (Expense)       Net of
(millions)                                   Taxes         Benefit        Taxes
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Unrealized holding losses arising
   during the year                          $ (130)         $   49       $  (81)
Less: reclassification adjustment               47             (17)          30
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net unrealized investment losses              (177)             66         (111)
Net foreign exchange losses                    (18)              6          (12)
Net additional minimum pension
   liability adjustment                       (155)             59          (96)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
   Total other comprehensive loss           $ (350)         $  131       $ (219)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


                                            Amount      Income Tax       Amount
Year ended December 31, 1997                Before       (Expense)       Net of
(millions)                                   Taxes         Benefit        Taxes
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Unrealized holding gains arising
   during the year                          $   86          $  (32)      $   54
Less: reclassification adjustment               29             (11)          18
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net unrealized investment gains                 57             (21)          36
Net foreign exchange losses                   (138)             51          (87)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
   Total  other  comprehensive  loss        $  (81)         $   30       $  (51)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

The components of accumulated other comprehensive  income (loss), net of related
tax, as of December 31, 1999, 1998 and 1997 are as follows:

(millions)                                    1999            1998         1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net unrealized investment gains (losses)    $ (121)         $   78        $ 189
Net foreign exchange losses                   (152)            (98)         (86)
Net additional minimum pension liability       (36)            (96)          --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Accumulated other comprehensive
   income (loss)                            $ (309)         $ (116)       $ 103
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


3  BUSINESS COMBINATIONS
================================================================================

PURCHASE METHOD
In 1999,  Aon  acquired  The Nikols Group (the  leading  Italian  insurance  and
reinsurance broker),  Presidium Holdings,  Inc. (a third-party  insurance claims
administration  firm that  specializes  in  managing  all  aspects  of  workers'
compensation  claims),  Societe Generale d'Assurance et de Prevoganie (a leading
French broker) and certain other insurance  brokerage and consulting  operations
for  approximately  $395 million in cash  transactions  and $45 million in stock
transactions  accounted for on a preliminary  basis by the purchase method.  Aon
also acquired  insurance  underwriting  blocks of business for $50 million.  The
acquisitions were financed by internal funds,  short-term  borrowings and stock.
Excess of cost over net assets purchased of approximately  $500 million resulted
from the 1999 acquisitions and is primarily being amortized over 40 years.

In 1999, Aon consummated a plan of  restructuring  its operations as a result of
recent  business  combination  activity.  A charge was recorded in the amount of
$120 million.  Total  termination  benefits were $67 million and related pension
expense was $32 million,  involving  900  positions,  of which 860  terminations
occurred in 1999 and 40 are planned for 2000.  Benefits related to pension plans
are  included in Aon's  total  pension  liability.  Workforce  reductions  were
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.   The  remaining   charges  of  $21  million  primarily  reflect  lease
abandonments of $11 million relating to the consolidation of worldwide brokerage
operations and asset impairments of $10 million.

                                     - 33 -
<PAGE>
The  following  table  demonstrates  the activity  related to the  liability for
termination benefits and abandoned leases:

                                    Termination       Lease
(millions)                            Benefits    Abandonments    Total
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Expense charged in 1999                $  67          $ 11        $  78
Cash payments in 1999                    (51)           (6)         (57)
                                       ---------------------------------
Balance at December 31, 1999           $  16          $  5        $  21
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------

In 1998,  Aon  acquired Le Blanc de Nicolay,  Gil y Carvajal  and certain  other
operations for approximately  $400 million in transactions  accounted for by the
purchase method. The purchase accounting for these acquisitions was finalized in
1999.  The   acquisitions   were  financed  by  internal  funds  and  short-term
borrowings.  Excess cost over net assets purchased of approximately $400 million
resulted from the 1998  acquisitions  and is being amortized over 40 years. As a
result of 1998 acquisitions and the finalization of purchase  accounting for the
1997  acquisition of Jauch and Hubener,  Aon had established  approximately  $70
million of purchase  accounting  liabilities  primarily  relating to termination
benefits  and lease  abandonments.  Terminations  involved 160  positions  which
occurred in 1998 and 1999 as planned.

The following table demonstrates the activity related to the liabilities:

                                    Termination       Lease
(millions)                            Benefits    Abandonments    Total
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Initial liability                     $   40         $  30       $   70
Cash payments in 1998                    (16)           (4)         (20)
                                      ----------------------------------
Balance at December 31, 1998              24            26           50
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------
Cash payments in 1999                    (24)           (6)         (30)
                                      ----------------------------------
Balance at December 31, 1999          $   --         $  20       $   20
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------


In 1997,  Aon acquired  Alexander and Alexander  Services,  Inc.  (A&A) for $1.3
billion and the Minet Group (Minet) and Jauch & Hubener for  approximately  $300
million.  These transactions were accounted for by the purchase method. The 1997
acquisitions were financed  primarily by the issuance of capital securities (see
note 9), issuance of commercial  paper and internal  funds.  Excess of cost over
net assets  purchased  of  approximately  $1.5  billion  was created by the 1997
acquisitions,  of which $1.2  billion  was for A&A.  The excess of cost over net
assets purchased is primarily being amortized over 40 years.

In second  quarter 1997, Aon recorded  pretax special  charges of $27 million to
recognize  investment  losses  incurred at A&A before Aon acquired A&A. At Aon's
acquisition  date, the carrying value of certain  securities in A&A's  portfolio
was  overstated  by the  previously  unrecognized  investment  losses.

In first quarter 1997,  Aon  recorded  pretax  special  charges of  $145 million
related  to management's  commitment  to a formal  plan of  restructuring  Aon's
brokerage  operations  as a result of the acquisition of A&A.  These charges, in
addition  to certain charges  taken  in  1996,  constitute  the "Aon Plan."  The
restructuring  charges  included  costs  related to termination  benefits of $40
million,  lease  abandonments  and  other  exit  costs  of $68 million and asset
impairments  of $37 million   relating  to  the abandonment of systems and  real
estate  space. Terminations  involved  600  positions which occurred in 1997 and
1998 as planned.  The lease abandonments  amount to $54  million,  are primarily
located  in  the  United  Kingdom  and  are being paid out over several years as
planned.


The  following  table   demonstrates  the  activity  related  to  the  Aon  Plan
liabilities:

                                                    Lease
                                                 Abandonments
                                   Termination     and Other
(millions)                          Benefits      Exit Costs        Total
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Balance at December 31, 1996         $   12        $   48       $     60
Expense charged in 1997                  40            68            108
Cash payments in 1997                   (48)          (10)           (58)
                                     ------------------------------------
Balance at December 31, 1997              4           106            110
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Cash payments in 1998                    (4)          (26)           (30)
                                     ------------------------------------
Balance at December 31, 1998             --            80             80
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Cash payments in 1999                    --           (24)           (24)
Credit to expense in 1999                --           (11)           (11)
                                     ------------------------------------
Balance at December 31, 1999         $   --        $   45       $     45
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------

Also in 1997, due to management's  commitment to a formal plan of  restructuring
the A&A and  Bain  Hogg (a late  1996  acquisition)  brokerage  operations,  Aon
estimated  costs  of $264  million  which  were  allocated  to the cost of those
acquisitions  (the "A&A and Bain Hogg  Plan").  The  costs  primarily  relate to
termination  benefits  and  lease  abandonments.   Terminations   involved  2000
positions that occurred in 1997 and 1998 as planned.

                                     - 34 -
<PAGE>

The following table  demonstrates  the activity related to the A&A and Bain Hogg
Plan liabilities:
                                                    Lease
                                                 Abandonments
                                   Termination     and Other
(millions)                          Benefits      Exit Costs        Total
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Initial liability                   $ 100            $ 164         $ 264
Cash payments in 1997                 (65)             (44)         (109)
                                    -------------------------------------
Balance at December 31, 1997           35              120           155
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Cash payments in 1998                 (35)             (45)          (80)
                                    -------------------------------------
Balance at December 31, 1998           --               75            75
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------
Cash payments in 1999                  --              (28)          (28)
Charge to expense in 1999              --               13            13
                                    -------------------------------------
Balance at December 31, 1999        $  --            $  60         $  60
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------

The remaining liabilities at December 31, 1999 primarily relate to real estate.

All of Aon's  liabilities  relating to  acquisitions  are  reflected  in general
expense liabilities in the consolidated statements of financial position.

In accordance  with a 1992 purchase  agreement,  securities  with a value of $48
million are being held in escrow. The escrowed  securities will be released on a
predetermined schedule through 2007.

POOLING OF INTERESTS METHOD
In 1998 and 1997,  Aon  issued  2,315,000  shares and  411,000  shares of common
stock,  respectively,  for  mergers  with  insurance  brokerage  and  consulting
organizations.  In connection with several of the mergers,  94,000 shares issued
to sellers are being held in escrow at December 31, 1999, pending the resolution
of contingencies. Aon's prior period financial statements have not been restated
for the mergers because the effect of the above mergers was not material.

4  DISCONTINUED OPERATIONS
================================================================================

A&A discontinued its property and casualty 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  December  31,  1999,  the  liabilities  associated  with  the  foregoing
indemnities  and  liabilities of insurance  underwriting  subsidiaries  that are
currently in run-off  result  principally  from  asbestos,  pollution  and other
health hazard  insurance  claims and were included in other  liabilities  in the
accompanying  statement of financial position and amounted to $145 million. Such
liabilities  are  net of  reinsurance  recoverables  and  other  assets  of $178
million.

The  insurance  liabilities  represent  estimates  of known  and  future  claims
expected to be made under  occurrence-based  insurance  policies and reinsurance
business.  Those  claims are expected to develop and be settled over the next 20
to 30 years.

The  insurance  liabilities  cannot be estimated  using  conventional  actuarial
reserving  techniques  because  of,  among  other  matters,  the  inadequacy  of
available historical  experience to support such techniques and because case law
and  scientific  standards for measuring the adequacy of site clean-up are still
evolving.  Therefore,  independent  actuaries have combined  available  exposure
information with other relevant  industry data and have used various  projection
techniques to estimate the insurance liabilities.

Although these insurance  liabilities  represent a best estimate of the probable
liabilities, adverse developments may occur due to the nature of the information
available  and the  variables  inherent in the  estimation  processes.  Based on
current  estimates,  management  believes that the  established  liabilities  of
discontinued operations are sufficient.

                                     - 35 -
<PAGE>
5  INVESTMENTS
================================================================================

The  components  of  investment  income are as follows:

(millions)              Years ended December 31        1999      1998      1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Short-term investments                               $  173    $  196     $ 178
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Fixed maturities:
  Interest income                                       195       219       210
  Income on disposals                                    52        37        27
  Losses on disposals                                   (13)      (24)      (14)
                                                     ---------------------------
    Total                                               234       232       223
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Equity securities:
  Dividend income                                        42        80        95
  Income on disposals                                    18        65        52
  Losses on disposals                                   (11)      (27)      (32)
                                                     ---------------------------
    Total                                                49       118       115
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Limited partnerships and other:
  Interest, dividend and other income                    79        59        23
  Income (losses) on disposals                           48         1       (27)
                                                     ---------------------------
    Total                                               127        60        (4)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Gross investment income                                 583       606       512
Less investment expenses                                  6        16        12
                                                     ---------------------------
Investment income                                    $  577    $  590     $ 500
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

The components of net unrealized gains (losses) are as follows:


(millions)              Years ended December 31        1999      1998      1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Fixed maturities                                     $ (100)   $  108     $ 130
Equity securities                                       (88)       12       167
Deferred tax credit (charge)                             67       (42)     (108)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Net unrealized  investment  gains (losses)           $ (121)   $   78     $ 189
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

The pretax changes in net unrealized investment gains (losses) are as follows:

(millions)              Years ended December 31        1999      1998      1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Fixed maturities                                     $ (208)   $  (22)   $   18
Equity securities                                      (100)     (155)       39
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Total                                                $ (308)   $ (177)   $   57
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


The amortized cost and fair value of investments in fixed  maturities and equity
securities are as follows:

                                                   Gross       Gross
(millions)                            Amortized  Unrealized  Unrealized    Fair
As of December 31, 1999                  Cost      Gains       Losses     Value
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
U.S. government and
   agencies                            $  170      $   1       $  (11)   $  160
States and political
   subdivisions                             8         --           (1)        7
Foreign governments                       755         14          (19)      750
Corporate securities                    1,577          8          (90)    1,495
Mortgage-backed securities                 44         --           (1)       43
Other fixed maturities                     43          1           (2)       42
                                      ------------------------------------------
Total fixed maturities                  2,597         24         (124)    2,497
Total equity securities                   662         12         (100)      574
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Total                                 $ 3,259      $  36       $ (224)  $ 3,071
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


                                                   Gross       Gross
(millions)                            Amortized  Unrealized  Unrealized    Fair
As of December 31, 1998                  Cost      Gains       Losses     Value
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
U.S. government and
   agencies                           $    96      $   6       $   (1)  $   101
States and political
   subdivisions                           485         32           --       517
Foreign governments                       740         65           (4)      801
Corporate securities                    1,596         54          (46)    1,604
Mortgage-backed securities                 25          1           --        26
Other fixed maturities                     53          1           --        54
                                      ------------------------------------------
Total fixed maturities                  2,995        159          (51)    3,103
Total equity securities                   756         49          (37)      768
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Total                                 $ 3,751      $ 208       $  (88)  $ 3,871
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


The amortized cost and fair value of fixed maturities,  by contractual  maturity
as of December 31, 1999, are shown on page 37.  Expected  maturities will differ
from  contractual  maturities  because  borrowers  may have the right to call or
prepay obligations with or without call or prepayment penalties.

                                     - 36 -
<PAGE>

                                                  Amortized      Fair
(millions)                                           Cost       Value
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------
Due in one year or less                          $    152     $   140
Due after one year through five years                 730         729
Due after five years through ten years                841         799
Due after ten years                                   830         786
Mortgage-backed securities                             44          43
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------
Total fixed maturities                            $ 2,597     $ 2,497
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------


Securities on deposit for regulatory authorities as required  by law amounted to
$323 million at December  31, 1999 and $274  million at December  31,  1998.  As
required  by the  bylaws of Lloyd's  brokers,  cash and  short-term  investments
subject to floating charges for the benefit of insurance  creditors  amounted to
$1.2 billion and $1.3 billion at December 31, 1999 and 1998,  respectively.  Aon
maintains  premium trust bank accounts for premiums  collected from insureds but
not yet remitted to insurance companies of $1.3 billion at December 31, 1999 and
1998.

At  December  31,  1999  and  1998,   Aon  had  $41  million  and  $56  million,
respectively, of non-income producing investments.


6  DEBT AND LEASE COMMITMENTS
================================================================================

NOTES PAYABLE
The following is a summary of notes payable:

(millions)              As of December 31             1999        1998
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------
6.9% debt securities, due July 2004                $   250       $  --
6.3% debt securities, due January 2004                 100         100
6.7% debt securities, due June 2003                    150         150
7.4% debt securities, due October 2002                 100         100
6.875% debt securities, due October 1999                --         100
Euro credit facility, due June 2003, with interest
  at 3.3% to 3.6%                                      292         343
Debt guarantee of employee stock ownership
  plan (ESOP)                                           --          17
Notes payable, due in varying installments,
  with interest at 4% to 10%                           119         113
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------
Total notes payable                                $ 1,011       $ 923
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------

In May  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 July 2004. The net proceeds from
the sale of the 6.9% notes were used to reduce outstanding short-term commercial
paper borrowings.

In 1999,  Aon's 6.875% debt  securities,  due in October 1999,  were redeemed at
100% of the principal amount plus accrued interest.

Interest is payable semi-annually on all debt securities.  In addition, the debt
securities  are not  redeemable by  Aon prior to maturity and contain no sinking
fund provisions.  Maturities of notes payable are  $7 million, $5 million,  $103
million,  $442  million and  $420 million in 2000,  2001,  2002,  2003 and 2004,
respectively.

In 1998, Aon entered into a committed  bank credit  facility under which certain
European  subsidiaries  can borrow up to EUR 400 million.  At December 31, 1999,
Aon had borrowed EUR 347 million ($351 million)  under this  facility,  of which
$59  million  is  classified  as  short-term  borrowings  and  $292  million  is
classified  as  notes  payable  in  the  consolidated  statements  of  financial
position.  Aon has $1.1 billion of other unused committed bank credit facilities
at December 31, 1999 to support its commercial  paper borrowings which were $844
million at December 31, 1999.

Information related to  notes payable (excluding the debt guarantee of ESOP) and
short-term borrowings is as follows:

Years ended December 31                   1999   1998   1997
- - - - - - - - - - - - - - - - - -------------------------------------------------------------
Interest paid (millions)                 $ 105   $ 87  $ 70
Weighted-average  interest  rates--
  short-term  borrowings                   5.4%   5.5%  5.6%
- - - - - - - - - - - - - - - - - -------------------------------------------------------------

DEBT GUARANTEE OF ESOP
Aon's ESOP entered into loan agreements to purchase Aon common stock.  The loans
were  unconditionally  guaranteed by Aon and therefore the unpaid balance of the
loans  was  classified  as  notes  payable  in  the  accompanying   consolidated
statements of financial position.  An equivalent amount,  representing  deferred
compensation, was recorded as a deduction from

                                     - 37 -
<PAGE>
stockholders' equity. The ESOP paid $18 million in 1999 and 1998 and $16 million
in 1997, in loan  principal and interest from  contributions  made by Aon to the
ESOP, as well as dividend  proceeds of common stock held by the ESOP.  The loans
had an  interest  rate of 8.35% and  matured in 1999.  The  remaining  1,101,000
shares were released for allocation in 1999.

The following table details the shares held by the ESOP at December 31, 1998:

(thousands)
- - - - - - - - - - - - - - - - - ------------------------------------------
Allocated                           4,860
Committed to be released            1,101
- - - - - - - - - - - - - - - - - ------------------------------------------
Total                               5,961
- - - - - - - - - - - - - - - - - ------------------------------------------

LEASE COMMITMENTS
Aon has noncancelable operating   leases for certain office space, equipment and
automobiles.   Future minimum  rental  payments required under  operating leases
that have initial  or remaining  noncancelable lease terms in excess of one year
at December 31, 1999 are:

(millions)
- - - - - - - - - - - - - - - - - ------------------------------------------
2000                              $   224
2001                                  197
2002                                  176
2003                                  154
2004                                  133
Later years                           727
- - - - - - - - - - - - - - - - - ------------------------------------------
Total minimum payments required   $ 1,611
- - - - - - - - - - - - - - - - - ------------------------------------------

Rental expenses for all operating  leases for the years ended December 31, 1999,
1998 and  1997,  amounted  to $198  million,  $202  million  and  $177  million,
respectively.


7  INCOME TAX
================================================================================

Aon  and its  principal  domestic  subsidiaries are included  in a  consolidated
life-nonlife federal income tax return.  Aon's foreign subsidiaries file various
income tax returns in their foreign jurisdictions.

Income  before  income  taxes and the  provision for income taxes consist of the
following:


(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Income before income taxes:
  U.S.                                         $ 444       $ 528       $ 353
  Foreign                                        191         403         189
                                               ------------------------------
Total                                          $ 635       $ 931       $ 542
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Provision for income taxes:
Current:
  Federal                                      $ 201       $ 184       $  21
  Foreign                                         60          53          35
  State                                           20          23          18
                                               ------------------------------
Total current                                  $ 281       $ 260       $  74
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Deferred (credit):
  Federal                                      $ (42)      $   2       $ 100
  Foreign                                          7          87          24
  State                                           (3)         --           5
                                               ------------------------------
Total deferred                                   (38)         89         129
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Provision for income tax                       $ 243       $ 349       $ 203
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


During 1999, 1998 and 1997,  Aon's  consolidated  statements of income reflect a
tax benefit of $26 million,  $25 million and $24 million,  respectively,  on the
capital securities.

A  reconciliation  of the  income  tax  provisions  based on the U.S.  statutory
corporate tax rate to the  provisions  reflected in the  consolidated  financial
statements is as follows:

                  Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Statutory tax rate                              35.0%       35.0%       35.0%
Tax-exempt investment income                    (1.2)       (1.8)       (3.1)
Amortization of intangible assets
  relating to acquired businesses                2.8         1.9         3.3
State income taxes                               1.7         1.6         2.8
Other--net                                        --         0.8        (0.5)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Effective tax rate                              38.3%       37.5%       37.5%
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

                                     - 38 -
<PAGE>

Significant  components of Aon's  deferred tax assets and  liabilities are as
follows:

(millions)              As of December 31                    1999        1998
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
Deferred tax assets:
  Net operating loss and tax credit carryforwards          $   36      $   82
  Certain purchase accounting and special charges              58          93
  Unrealized investment losses                                 67          --
  Employee benefit plans                                       64          57
  Unrealized foreign exchange losses                           97          62
  Other                                                       156          92
                                                           -------------------
  Total                                                    $  478      $  386
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
Deferred tax liabilities:
  Policy acquisition costs                                 $  (53)     $  (41)
  Unrealized investment gains                                  --         (42)
  Other                                                      (127)        (38)
                                                           -------------------
  Total                                                      (180)       (121)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
Valuation allowance                                           (28)        (51)
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
Net deferred tax assets                                    $  270      $  214
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------

There are  limitations  on the  utilization of net operating loss and tax credit
carryforwards  after a change of  control,  consequently,  there  will be annual
limitations on the realization of these tax assets.  Accordingly,  in connection
with the purchase of A&A, a $56 million  valuation  allowance was established in
1997. The valuation  allowance changed to $51 million in 1998 and $28 million in
1999 corresponding to reductions in related deferred tax assets,  with no effect
on income.  Subsequently,  recognized  tax benefits for these items would reduce
excess of cost over net assets  purchased.  Although  future  earnings cannot be
predicted with certainty,  management currently believes that realization of the
net deferred tax asset after  consideration  of the valuation  allowance is more
likely than not.

Prior to 1984, the life insurance  companies were required to accumulate certain
untaxed amounts in a memorandum  "policyholders' surplus account." Under the Tax
Reform Act of 1984, the "policyholders'  surplus account" balances were "capped"
at  December  31,  1983  and the  balances  will  be  taxed  only to the  extent
distributed to stockholders or when they exceed certain prescribed limits. As of
December 31, 1999, the combined  "policyholders'  surplus account" of Aon's life
insurance   subsidiaries   approximates  $363  million.   Aon's  life  insurance
subsidiaries  do not  intend to make any  taxable  distributions  or exceed  the
prescribed limits in the foreseeable future;  therefore, no income tax provision
has been made. However, if such taxes were assessed, the amount of taxes payable
would be approximately $127 million.

The amount of income taxes paid in 1999,  1998 and 1997 was $324  million,  $249
million and $137 million, respectively.

8  REINSURANCE AND CLAIM RESERVES
================================================================================

Aon's insurance  subsidiaries are involved in both the cession and assumption of
reinsurance  with other  companies.  Aon's  reinsurance  consists  primarily  of
short-duration   contracts  that  are  entered  into  with  numerous  automobile
dealerships  and insurers.  Aon's  insurance  subsidiaries  remain liable to the
extent that the  reinsuring  companies are unable to meet their  obligations.

A summary of reinsurance activity is as follows:

(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Ceded premiums earned                          $ 624       $ 580       $ 609
Ceded premiums written                           510         528         713
Assumed premiums earned                          178         149         298
Assumed premiums written                         116         133         284
Ceded benefits to policyholders                  377         325         286
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


Activity in the liability for policy contract claims is summarized as follows:

(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Liabilities at beginning of year               $ 483      $  520      $  535
Incurred losses:
   Current year                                  890         807         814
   Prior years                                   (39)        (19)        (50)
                                               ------------------------------
Total                                            851         788         764
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Payment of claims:
   Current year                                 (618)       (539)       (538)
   Prior years                                  (268)       (286)       (241)
                                               ------------------------------
Total                                           (886)       (825)       (779)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Liabilities  at end of  year
  (net  of  reinsurance  recoverables:
  1999-$316, 1998-$296,  1997-$289)            $ 448       $ 483       $ 520
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


                                     - 39 -
<PAGE>

9  REDEEMABLE PREFERRED STOCK, CAPITAL SECURITIES AND STOCKHOLDERS' EQUITY
================================================================================

REDEEMABLE  PREFERRED STOCK
At  December  31,  1999,  1,000,000  shares of  redeemable  preferred  stock are
outstanding.  Dividends are cumulative at an annual rate of $2.55 per share. The
shares of redeemable  preferred stock will be redeemable at the option of Aon or
the holders,  in whole or in part, at $50.00 per share  beginning one year after
the occurrence of certain future events.

CAPITAL SECURITIES
In January 1997,  Aon created Aon Capital A, a wholly-owned  statutory  business
trust,  for the  purpose of issuing  mandatorily  redeemable  preferred  capital
securities  (Capital  Securities).  The sole  asset of Aon  Capital A is an $824
million  aggregate   principal  amount  of  Aon's  8.205%  Junior   Subordinated
Deferrable Interest  Debentures due January 1, 2027. The back-up guarantees,  in
the  aggregate,  provide  a full  and  unconditional  guarantee  of the  Trust's
obligations under the Capital Securities.

Aon Capital A issued $800 million of 8.205% capital  securities in January 1997.
The proceeds from the issuance of the Capital  Securities were used to finance a
portion of the A&A acquisition.  The Capital Securities are subject to mandatory
redemption on January 1, 2027 or are  redeemable  in whole,  but not in part, at
the option of Aon upon the  occurrence  of certain  events.  Interest is payable
semi-annually on the Capital Securities.  The Capital Securities are categorized
in the  consolidated  statements  of  financial  position as  "Company-Obligated
Mandatorily  Redeemable Preferred Capital Securities of Subsidiary Trust Holding
Solely the Company's Junior  Subordinated  Debentures."  The after-tax  interest
incurred on the  Capital  Securities  is  reported  as minority  interest in the
consolidated statements of income.

8% CUMULATIVE  PERPETUAL PREFERRED STOCK
A December 31, 1996, 5,446,000 shares of 8% cumulative perpetual preferred stock
were  outstanding.  Dividends  were  cumulative  at the annual rate of $2.00 per
share.  In  November  1997,  Aon  purchased  and  retired  all of the  remaining
outstanding shares at a total cost of $136 million.

COMMON STOCK
Aon repurchased 2,774,000,  1,043,000 and 303,000 shares in 1999, 1998 and 1997,
respectively,  of its  common  stock,  primarily  to  provide  shares  for stock
compensation  plans and the  conversion  of preferred  stock.  In addition,  Aon
issued 1.5 million new shares of common stock in 1999 for employee benefit plans
and for acquisitions.

DIVIDENDS
A summary of dividends incurred is as follows:

(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Redeemable preferred stock                     $   3       $   3       $   3
8% cumulative perpetual preferred stock           --          --           9
Common stock                                     207         191         168
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Total dividends incurred                       $ 210       $ 194       $ 180
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


STATUTORY CAPITAL AND SURPLUS
Generally, the capital and surplus of Aon's insurance subsidiaries available for
transfer to the parent  company are  limited to the amounts  that the  insurance
subsidiaries'  statutory  capital and surplus exceed minimum  statutory  capital
requirements;  however,  payments of the amounts as dividends  may be subject to
approval  by  regulatory  authorities.  See note 7 for  possible  tax effects of
distributions made out of untaxed earnings.

Net statutory income of the insurance subsidiaries is summarized as follows:


(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Life insurance                                 $ 101       $ 239       $ 265
Property casualty                                 57          62          66
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Statutory  capital and surplus of the  insurance  subsidiaries  is summarized as
follows:


(millions)              As of December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Life insurance                                 $ 502       $ 610       $ 724
Property casualty                                411         446         438
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

                                     - 40 -
<PAGE>
10  EMPLOYEE BENEFITS
================================================================================

SAVINGS AND PROFIT SHARING PLANS
Aon subsidiaries  maintain  contributory savings plans for the benefit of United
States salaried and commissioned employees. Provisions made for these plans were
$37 million in 1999 and $22 million in 1998 and 1997.

EMPLOYEE STOCK OWNERSHIP PLAN
Aon  subsidiaries  maintained  a  leveraged  ESOP for the  benefit of the United
States salaried and certain commissioned  employees.  The final allocation under
the  leveraged  ESOP was for 1998.  Contributions  to the ESOP  amounted  to $16
million  and  $14  million  in  1998  and  1997,  respectively.  There  were  no
contributions in 1999.

PENSION AND OTHER POSTRETIREMENT BENEFITS
Aon sponsors  defined  benefit,  pension and  postretirement  health and welfare
plans  that  provide  retirement,  medical  and  life  insurance  benefits.  The
postretirement  health care plans are contributory,  with retiree  contributions
adjusted annually; the life insurance and pension plans are noncontributory.

U.S. PENSION AND OTHER BENEFIT PLANS
The following tables provide a reconciliation  of the changes in obligations and
fair  value of  assets  for the years  ended  December  31,  1999 and 1998 and a
statement of the funded status as of December 31, 1999 and 1998.

                                              Pension Benefits   Other Benefits
(millions)                                      1999     1998     1999     1998
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Reconciliation of benefit obligation
Obligation at beginning
  of period                                    $ 756    $ 692    $  70    $  61
Service cost                                      31       32        2        1
Interest cost                                     55       51        5        5
Participant contributions                         --       --        5        4
Plan amendments                                   --       (8)      --       --
Actuarial (gain) loss                             (2)     (13)      (8)       7
Acquisitions                                      --       11       --       --
Benefit payments                                 (40)     (38)     (12)      (8)
Curtailments                                      --       --        7       --
Special termination benefits                      32       --       --       --
Change in interest rate                         (100)      29       --       --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Obligation at end of period                    $ 732    $ 756    $  69    $  70
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Reconciliation of fair value of plan assets
Fair value at beginning
  of period                                    $ 904    $ 853    $   8    $   7
Actual return on plan assets                      66       60       --        1
Acquisitions                                      --       16       --       --
Employer contributions                             3       13       --       --
Benefit payments                                 (40)     (38)      --       --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Fair value at end of period                    $ 933    $ 904    $   8    $   8
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Funded status
Funded status at
  end of period                                $ 201    $ 148    $ (61)   $ (62)
Unrecognized prior-service                        (6)      (6)      (5)     (10)
Unrecognized gain                               (169)     (99)     (16)     (16)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Prepaid (accrued) benefit
  cost                                         $  26    $  43    $ (82)   $ (88)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

Pension plan assets  include 2.5 million  shares of common  stock  issued by Aon
for 1999 and 1998 on which dividends of $2 million were received in both years.

                                     - 41 -
<PAGE>
In February  1999,  Aon  established a limited time early  retirement  incentive
program that provided  benefits  through the defined  benefit  pension plan. The
additional cost of termination  benefits  applicable for 1999 resulting from the
program has been included above.

The  following  table  provides  the  components  of net  periodic  benefit cost
(credit) for the plans for the years ended December 31, 1999, 1998 and 1997:


(millions)        Pension Benefits              1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Service cost                                   $  31       $  32       $  32
Interest cost                                     55          51          46
Expected return on plan assets                   (89)        (71)        (62)
Amortization of prior-service                     (1)         (1)         --
Amortization of net gain                          (6)         --          --
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Net periodic benefit cost (credit)             $ (10)      $  11       $  16
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


(millions)        Other Benefits                1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Service cost                                   $   2       $   1       $   2
Interest cost                                      5           5           4
Expected return on plan assets                    --          (1)         (1)
Amortization of prior-service                     (5)         (5)         (5)
Amortization of net gain                          (1)         (1)         (1)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Net periodic benefit cost (credit)             $   1       $  (1)      $  (1)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

The  weighted-average  assumptions for the measurement  period for U.S.  benefit
obligations are shown in the following table:

                                              Pension Benefits  Other Benefits
                                               1999     1998     1999     1998
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------------
Discount rate                                   8.0%     7.2%     8.0%     7.2%
Expected return on plan assets                 10.0      9.0       --       --
Rate of compensation increase                   4.0      5.0      4.0      5.0
- - - - - - - - - - - - - - - - - -------------------------------------------------------------------------------


ASSUMPTIONS FOR OTHER POSTRETIREMENT BENEFITS
The employer's liability for future plan cost increase is limited in any year to
5% per annum.  For measurement  purposes in 1999, 1998 and 1997,  7.0%, 7.5% and
8.5%,  respectively,  annual  rate of increase in the per capita cost of covered
health  care  benefits  (trend  rate)  adjusted  for  actual  current  year cost
experience  was assumed,  decreasing  gradually to 6% in year 2003 and remaining
the same thereafter.  However, with the employer funding increase cap limited to
5% per year, net employer trend rates are effectively  limited to 5% per year in
the future.

Due to the employer  funding cap, a 1% change in assumed  healthcare  cost trend
rates has no effect on the service and interest cost  components of net periodic
postretirement  healthcare  benefit cost and on the  accumulated  postretirement
benefit obligation for the measurement period ended in 1999.

INTERNATIONAL PENSION PLANS
The following tables provide a reconciliation  of the changes in obligations and
fair  value of  assets  for the years  ended  December  31,  1999 and 1998 and a
statement  of the funded  status as of December  31, 1999 and 1998 for  material
international   plans,   which  are  located  in  the  United  Kingdom  and  The
Netherlands.

                                                        International Pension
(millions)                                                  1999        1998
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Reconciliation of benefit obligation
Obligation at beginning of period                        $ 2,147     $ 1,623
Service cost                                                  74          61
Interest cost                                                127         113
Participants contributions                                     6           7
Benefit payments                                             (77)        (73)
Change in interest rate                                       29         375
Foreign exchange translation                                 (96)         41
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Obligation at end of period                              $ 2,210     $ 2,147
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Reconciliation of fair value of plan assets
Fair value at beginning of period                        $ 1,976     $ 1,752
Actual return on plan assets                                 248         215
Employer contributions                                        61          33
Participants contributions                                     6           7
Benefit payments                                             (77)        (73)
Foreign exchange translation                                 (92)         42
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Fair value at end of period                              $ 2,122     $ 1,976
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Funded status
Funded status at end of period                           $   (88)    $  (171)
Unrecognized prior-service                                     1           1
Unrecognized loss                                            260         430
Additional minimum pension liability                         (60)       (155)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Prepaid benefit cost                                     $   113     $   105
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

In 1999, plans with a projected  benefit  obligation (PBO) in excess of the fair
value of plan assets had a PBO of $1.4 billion and plan assets with a fair value
of $1.3  billion,  and plans with an  accumulated  benefit  obligation  (ABO) in
excess of the fair  value of plan  assets  had an ABO of $480  million  and plan
assets with a fair value of $440  million.  Also, in 1999,  the prepaid


                                     - 42 -
<PAGE>
benefit cost presented in the foregoing table is comprised of plans with prepaid
assets of $173 million and accrued liabilities of $60 million.

The following table provides the components of net periodic benefit cost for the
international plans for the measurement period ended in 1999, 1998 and 1997:


(millions)                                      1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Service cost                                  $   74      $   61      $   49
Interest cost                                    127         113          96
Expected return on plan assets                  (196)       (172)       (141)
Amortization of net loss                           8           2          --
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Net periodic benefit cost                     $   13       $   4       $   4
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

The   weighted-average   assumptions   for  the   measurement   period  for  the
international pension benefit obligations are shown in the following table:

                                                1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Discount rate                               6.0- 7.0%   6.0- 7.0%        7.0%
Expected return on plan assets              7.0-10.0    7.0-10.0    7.0-10.0
Rate of compensation increase               4.0- 4.5    4.0- 4.5    4.0- 5.5
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------


11  STOCK COMPENSATION PLANS
================================================================================

STOCK AWARD PLAN
Under the Aon Stock  Award  Plan,  Aon could  award up to  19,400,000  shares of
common  stock.  At December  31, 1999,  approximately  3,900,000  shares  remain
available  for  award.  Generally,  the award plan  requires  the  employees  to
complete  three  continuous  years of service before the award begins to vest in
increments  until the completion of a ten-year period of continuous  employment.
In general,  most awarded shares are issued as they become vested.  With certain
limited exceptions,  any break in continuous employment will cause forfeiture of
all  unvested  awards.  The  compensation  cost  associated  with each  award is
deferred  and  amortized  over the  period of  continuous  employment  using the
straight-line method.

Aon common stock awards outstanding consist of the following:

(shares in thousands)
Years ended December 31                         1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Shares outstanding at beginning
  of year                                      9,321       9,621       7,815
Granted                                        2,056       1,179       2,804
Vested and exercised                          (1,159)     (1,205)       (855)
Canceled                                        (353)       (274)       (143)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Shares outstanding at end of year              9,865       9,321       9,621
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

STOCK OPTION PLAN
Under the nonqualified  Aon Stock Option Plan,  options to purchase common stock
were granted to certain  officers and employees of Aon and its  subsidiaries  at
100% of market  value on the date of grant.  Under  the  plan,  Aon could  issue
options to purchase up to 35,000,000 shares. Generally, the option plan requires
employees to complete three continuous years of service before the options begin
to vest in increments  until the  completion of a six-year  period of continuous
employment.

A summary of Aon's stock option activity and related information consists of the
following:

Years ended December 31                       1999           1998           1997
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
                                         Weighted-      Weighted-      Weighted-
                                           Average        Average        Average
                                          Exercise       Exercise       Exercise
(shares in thousands)                 Shares Price   Shares Price   Shares Price
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Beginning
  outstanding                        10,298   $ 26   9,078   $ 21    7,914  $ 17
Granted                               2,417     43   2,381     43    2,469    32
Exercised                            (1,026)    17    (987)    15     (869)   13
Canceled                               (466)    28    (174)    22     (436)   19
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Ending
  outstanding                        11,223   $ 31  10,298   $ 26    9,078  $ 21
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Exercisable at
  end of year                         1,833   $ 17   1,262   $ 15    1,044  $ 14
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
Options available
  for grant                           4,843          6,795           9,002
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

                                     - 43 -
<PAGE>
A summary of options outstanding and exercisable is as follows:

As of December 31, 1999
(shares in thousands)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
                                 Options Outstanding         Options Exercisable
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
                                  Weighted-
                                    Average Weighted-                  Weighted-
Range of                          Remaining   Average                    Average
Exercise             Shares     Contractual  Exercise           Shares  Exercise
Prices          Outstanding     Life(years)     Price      Exercisable     Price
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
$ 14.17-$ 15.09       1,423             1.3   $ 14.93              780   $ 14.92
  15.22-  21.72       1,303             2.0     16.08              613     16.20
  22.89-  22.89       1,614             3.2     22.89              385     22.89
  23.56-  28.92       2,136             6.9     28.62               55     25.65
  29.63-  42.67         530             7.9     35.70               --        --
  43.33-  43.33       2,120             8.2     43.33               --        --
  43.44-  49.29       2,097             9.2     43.56               --        --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
$ 14.17-$ 49.29      11,223             5.8   $ 30.51            1,833   $ 17.34
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------

As of December 31, 1998
(shares in thousands)
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
                                 Options Outstanding         Options Exercisable
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
                                  Weighted-
                                    Average Weighted-                  Weighted-
Range of                          Remaining   Average                    Average
Exercise             Shares     Contractual  Exercise           Shares  Exercise
Prices          Outstanding     Life(years)     Price      Exercisable     Price
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
$ 12.71-$ 14.86         572             1.9   $ 13.91              315   $ 13.46
  15.09-  15.09       1,292             2.2     15.09              446     15.09
  15.22-  15.89       1,335             3.1     15.85              297     15.81
  15.93-  21.72         423             1.8     16.52              204     16.56
  22.89-  22.89       1,848             4.2     22.89               --        --
  23.55-  28.92       2,223             7.9     28.63               --        --
  35.06-  47.87       2,605             9.1     41.99               --        --
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------
$ 12.71-$ 47.87      10,298             5.6   $ 26.31            1,262   $ 15.09
- - - - - - - - - - - - - - - - - --------------------------------------------------------------------------------


PRO FORMA INFORMATION
Pro forma information  regarding net income and net income per share is required
by FASB  Statement No. 123, and has been  determined as if Aon had accounted for
employee stock options and stock awards under the fair value method.

The pro forma net income and net income per share information is as follows:

Years ended December 31                         1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Net income (millions):
   As reported                                 $ 352       $ 541       $ 299
   Pro forma                                     341         530         292
Net income per share:
  Dilutive
   As reported                                  1.33        2.07        1.12
   Pro forma                                    1.29        2.03        1.09
  Basic
   As reported                                  1.35        2.11        1.14
   Pro forma                                    1.31        2.07        1.11
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

The fair value per share of options and awards  granted is  estimated  as $10.87
and $35.02 in 1999,  $11.01  and  $37.39 in 1998,  and $5.98 and $27.73 in 1997,
respectively,  on the grant date using the  Black-Scholes  option  pricing model
with the following weighted-average assumptions:

                                                1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Dividend yield                                   2.0%        2.0%        2.5%
Expected volatility                               21%         20%         20%
Risk-free interest rate                            6%          6%          6%
Expected term life (in years):
   Stock options                                0.87        1.35        1.35
   Stock awards                                    0           0           0
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

The  compensation  cost as  generated  by the  Black-Scholes  model,  may not be
indicative  of the future  benefit,  if any,  that may be received by the option
holder.

The pro forma  information  reflected  above may not  be  representative  of the
amounts to be expected in future  years as the fair value  method of  accounting
contained  in FASB  Statement  No. 123 has not been  applied to options  granted
prior to January 1995.

EMPLOYEE STOCK PURCHASE PLANS
Effective  July 1, 1998,  Aon adopted an employee  stock  purchase  plan,  which
provides for the purchase of a maximum of 7,500,000 shares of Aon's common stock
by eligible U.S. employees.  Under the plan, shares of Aon's common stock may be
purchased at six-month intervals at 85% of the lower of the fair market value of
the  common  stock on the  first or the last day of each  six-month  period.  No
shares  were  issued  under  the plan in  1998.  In 1999,  333,000  shares  were
purchased  by  employees  under  the plan.  Approximately  320,000  shares  were
purchased by employees under the plan in January 2000.

In 1999,  Aon adopted an employee  stock  purchase  plan which  provides for the
purchase of approximately  720,000 shares of Aon's common stock by eligible U.K.
employees  that is similar to the U.S.  plan  described  above.  No shares  were
issued under the plan in 1999.

                                     - 44 -
<PAGE>
12  FINANCIAL INSTRUMENTS
================================================================================

FINANCIAL RISK MANAGEMENT
Aon is exposed to market risk from changes in foreign  currency  exchange rates,
interest rates and securities  prices. To manage the volatility related to these
exposures,  Aon enters into various derivative transactions that have the effect
of reducing these risks by creating offsetting market exposures.  If Aon did not
use derivative contracts, its exposure and market risk would be higher.

Derivative transactions are governed by a uniform set of policies and procedures
covering  areas  such  as  authorization,   counterparty  exposure  and  hedging
practices.  Positions are monitored  using  techniques  such as market value and
sensitivity analyses.

In  addition  to  creating  market  risks that  offset the  underlying  business
exposures,  certain  derivatives  also give rise to credit risks due to possible
non-performance by  counterparties.  The credit risk is generally limited to the
fair value of those  contracts  that are  favorable  to Aon. Aon has limited its
credit risk by  restricting  investments  in  derivative  contracts to a diverse
group of highly rated major financial institutions and by using  exchange-traded
instruments.  Aon closely monitors  the credit-worthiness of and exposure to its
counterparties and considers its credit risk to be minimal. At December 31, 1999
and 1998,  Aon placed  securities  in escrow  amounting  to  $4  million  and $8
million, respectively, relating to these derivative contracts.

FOREIGN EXCHANGE RISK MANAGEMENT
Certain  of  Aon's  foreign  brokerage  subsidiaries,  primarily  in the  United
Kingdom,  receive  revenues in currencies that differ from the currency in which
their  operating  expenses are  denominated.  To reduce the  variability of cash
flows from these operations,  foreign exchange forward contracts and options are
used having  settlement  dates that are  primarily  less than one year.  Related
gains or losses on these contracts are reflected as an adjustment to income when
the currencies are exchanged to settle expense  commitments.  Forward  contracts
entered into  require no up-front  premium and settle at the  expiration  of the
related contract.

Prior to July 1999,  Aon managed a group of foreign  exchange and interest  rate
risks that  considered the  correlation  among  thirteen  currency rates and two
short-term  interest rates. Aon used foreign currency listed futures and options
on futures, as well as over-the-counter options, and forward contracts to manage
the effects of foreign currency fluctuations on the translation of the financial
statements of Aon's foreign operations.  Generally,  related gains and losses on
these  contracts  were  reflected as an adjustment  to income when settled.  For
contracts  designated  as  hedges of a net  investment  in  foreign  subsidiary,
realized and unrealized gains were recorded directly to stockholders'  equity as
a component of net unrealized foreign exchange gains and losses.

INTEREST RATE RISK MANAGEMENT
Aon uses  interest  rate  derivative  contracts to manage the interest rate risk
associated with assets and liabilities underlying its insurance underwriting and
insurance brokerage  businesses.  Interest rate derivatives are also utilized to
manage  the  company's  funding  and other  corporate  risks in the U.S.  and in
Europe.

Interest  rate swap  agreements  are being  used to manage  asset and  liability
durations.   Prior  to  1999,   exchange-traded   Eurodollar  futures,  used  in
conjunction with basis rate swaps, were used to manage asset liability durations
related to various other crediting  arrangements  emanating from other insurance
underwriting businesses. As of December 31, 1999 and 1998, these swap agreements
had the net effect of shortening  asset  durations.  Variable  rates received on
interest rate and basis rate swap agreements correlate with crediting rates paid
on  outstanding  liabilities.  The  net  effect  of  swap  payments  is  settled
periodically  and  reported  in income.  There is no  settlement  of  underlying
notional amounts.

Aon also enters  into  interest  rate swap and floor  agreements  and  purchases
exchange-traded  futures  and  options  to  limit  its  exposure  to  decreasing
short-term  interest rates,  primarily relating to brokerage  fiduciary funds in
the U.S., U.K. and Europe.  Aon also enters into interest rate swap  agreements,
sells exchange-traded  interest rate futures and purchases interest rate caps to
limit its interest  rate  exposure to financing  short-term  receivables  and to
manage  corporate  funding  risks.  The net effect of swap  payments  is settled
periodically  and  reported  in income.  There is no  settlement  of  underlying
notional  amounts.  Exchange-traded  futures are valued and settled daily,  with
amounts  reported in income when the contract  expires.  The commission paid for
these futures  contracts  represents  the cost basis of the  position,  until it
expires  or is  closed.  The  premium  that  Aon  pays for  interest  rate  caps
represents the cost basis of the position until it expires or is closed.

                                     - 45 -
<PAGE>
SECURITY PRICE RISK MANAGEMENT
Exchange-traded  treasury and equity futures and options are used primarily as a
hedge against the value of Aon's  available for sale  fixed-maturity  and equity
investments. Aon also uses exchange traded equity futures and options to protect
the value of its pension equity  investments.  Aon sells futures,  purchases put
options and writes call options.  Exchange-traded futures and options are valued
and settled daily. The premium that Aon pays for purchased  options and receives
for written options  represents the cost basis of the option until it expires or
is closed.

In most cases,  derivatives  hedging the invested  asset  portfolio  are hedging
groups of invested  assets.  The sale,  maturity or  extinguishment  of a hedged
invested  asset  within a group would not affect the  accounting  method for the
derivative.  The accounting for a hedge would differ from the company's  regular
accounting  practices  if the  hedge  ceases  to meet  the  criteria  for  hedge
accounting.

Realized gains and losses on derivatives that qualify as hedges are deferred and
reported as an adjustment of the cost basis of the hedged item.  Deferred  gains
and losses are amortized into income over the remaining life of the hedged item.
Outstanding  derivatives  that are  hedges of items  carried  at fair  value are
reflected  in the  financial  statements  at  fair  value  with  changes  in the
derivative  fair value  reported  as  unrealized  gains and losses  directly  in
stockholders' equity.

The  following  criteria  must be met in order for a  derivative  to qualify for
hedge accounting.  The derivative must be designated as a hedge at inception and
be  consistent  with Aon's  policy  for risk  management.  The  hedged  group of
invested  assets must have a reliably  measurable fair value and changes in fair
value must have the potential to affect future earnings.

Aon performs frequent  analyses to measure the degree of correlation  associated
with its  derivative  programs.  Aon assesses  the  adequacy of the  correlation
analyses  results in  determining  whether  the  derivatives  qualify  for hedge
accounting.  Changes in the fair value of the  derivative  must be  expected  to
substantially  offset  changes  in the fair value of the  designated  risk being
hedged.  If the criteria for hedge accounting are not met, the resulting gain or
loss from the hedge would be realized through the statement of operations in the
current period.

NOTIONAL AND OTHER DATA
The following are the notional amounts of Aon's outstanding  derivatives grouped
by the types of risks being managed reflecting various periods of exposure:

(millions)                 As of December 31                1999        1998
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Foreign currency management
  Forwards                                                $   65      $  195
  Futures                                                     --          69
  Call options                                               165          35
Interest rate and asset/liability duration
  management
  Eurodollar futures                                       4,455       1,730
  Eurosterling options                                       297          --
  Eurosterling futures                                       329         900
  Treasury futures                                            55          15
  Treasury call options                                       49          30
  Treasury put options                                        35          10
  Interest rate swaps--pay fixed                             660       1,192
  Interest rate swaps--receive fixed                          --         172
  Basis rate swaps--pay and receive variable                 397         184
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

Aon amortized  into income $6 million in 1999, $1 million in 1998 and $3 million
in 1997 of net  deferred  gains  relating to  derivatives.  Separately  deferred
hedging gains or losses for derivative  financial  instruments  accounted for as
hedges of anticipated  transactions  were $0 at December 31, 1999 and $5 million
of gains at December 31, 1998.

The  interest  rates on Aon's  outstanding  swaps at December  31 are  presented
below:

                         Receive         Pay        Pay       Receive
                           Fixed    Variable      Fixed      Variable
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------
1999                          --     5.7-5.9%   5.3-6.6%      5.1-6.0%
1998                     4.0-8.1%    3.2-8.8%   4.8-9.7%      4.3-5.7%
- - - - - - - - - - - - - - - - - ----------------------------------------------------------------------

As of December 31, 1999, swaps have maturities ranging from January 2000 to July
2004. Aon receives variable rates based on the one-month commercial paper rate.

                                     - 46 -
<PAGE>

OTHER FINANCIAL INSTRUMENTS
Aon has certain investment  commitments to provide capital and fixed-rate loans,
as well  as  certain  forward  contract  purchase  commitments.  The  investment
commitments,  which  would  be  collateralized  by  related  properties  of  the
underlying  investments,  involve  varying  elements of credit and market  risk.
Investment  commitments  outstanding  at December 31, 1999 and 1998 totaled $312
million and $283 million, respectively.

Subsidiaries of Aon have entered into  agreements  with financial  institutions,
whereby the  subsidiaries  sold  certain  receivables,  with  limited  recourse.
Agreements  provide  for sales of  receivables  on a  continuing  basis  through
December  2002.  As of  December  31,  1999 and  1998,  the  maximum  commitment
contained in these  agreements was $3.6 billion and $2.8 billion,  respectively.
Aon's maximum  credit risk under  recourse  provisions of these  agreements  was
approximately  $260  million  and $202  million at  December  31, 1999 and 1998,
respectively. In 1999, a subsidiary of Aon sold $10 million of credit protection
in the form of a credit default swap and purchased  similar  credit  protection,
also  in  the  form  of a  credit  default  swap,  to  offset  its  risk  in the
transaction.

An  Aon  subsidiary  issues  fixed-  and  floating-rate   Guaranteed  Investment
Contracts (GICS) and floating-rate  funding  agreements and invests the proceeds
primarily in the U.S.  fixed  income  markets.  The assets  backing the GICS are
subject to varying elements of credit and market risk.

FAIR VALUE OF FINANCIAL INSTRUMENTS
Accounting standards require the disclosure of fair values for certain financial
instruments.  The fair value  disclosures  are not  intended  to  encompass  the
majority of policy liabilities, various other non-financial instruments or other
intangible  assets  related  to Aon's  business.  Accordingly,  care  should  be
exercised in deriving  conclusions  about Aon's business or financial  condition
based on the fair  value  disclosures.  The  carrying  value  and fair  value of
certain of Aon's financial instruments are as follows:

As of December 31                         1999                      1998
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
                                    Carrying    Fair         Carrying    Fair
(millions)                             Value   Value            Value   Value
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
Assets:
  Fixed maturities and
    equity securities                $ 3,071 $ 3,071          $ 3,871 $ 3,871
  Other investments                      740     739              349     348
  Cash, receivables
    and short-term
    investments                       10,545  10,545            9,550   9,550
  Derivatives*                            --       3               --      (2)
Liabilities:
  Investment type
    insurance contracts                1,207   1,147            1,261   1,310
  Short-term borrowings,
    premium payables
    and general expenses              10,277  10,277            8,897   8,897
  Notes payable                        1,011   1,001              923     932
  Capital securities                     800     792              800     916
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------
* These exclude derivatives with a carrying value of $1 million and $(2) million
and a fair value of $(1)  million and $(2)  million  that are  included in other
asset categories at December 31, 1999 and 1998, respectively.


13  CONTINGENCIES
================================================================================

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

In 1998, the Internal  Revenue Service (IRS) proposed  adjustments to the tax of
certain Aon  subsidiaries  for the period of 1990  through  1993.  Most of these
adjustments  should  be  resolved  through  factual  substantiation  of  certain
accounting  matters.  However,  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 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.

                                     - 47 -
<PAGE>
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  brought  against
three insurance  carriers  reinsured by Allianz.  These three carriers  provided
certain types of workers' compensation  reinsurance to a pool of insurers and to
certain facilities managed by Unicover Managers, Inc. ("Unicover"), a New Jersey
corporation  not affiliated  with Aon.  Allianz  alleges that the Aon subsidiary
acted as an agent of the three  carriers  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 the carriers, through their agents, including the
Aon subsidiary  defendant.  Aon believes that the Aon subsidiary has meritorious
defenses and the Aon subsidiary intends to vigorously defend this claim.

Except for an action  filed to compel Aon to produce  documents  to which Aon is
responding,  the Allianz lawsuit is the only lawsuit or arbitration  relating to
Unicover in which any Aon related entity is a party.  However, in fourth quarter
1999 Aon  recognized a pretax charge for $72 million in general  expenses in its
insurance  brokerage and other services  segment  relating to Unicover and other
litigation matters. Of this charge, $27 million is for a January 2000 settlement
of certain Unicover related business reinsured by Reliance Group Holdings,  Inc.
The  remaining  Unicover  issues  are  complex  and,  therefore,  the  timing of
resolution cannot be determined at this time.

Certain U.K.  subsidiaries of Aon have been required by their  regulatory  body,
the  Personal  Investment  Authority  (PIA),  to  review  advice  given by those
subsidiaries  to  individuals  who bought  pension  plans during the period from
April 1988 to June 1994.  These reviews have  resulted in a  requirement  to pay
compensation  to clients  based on  guidelines  issued by the PIA. In 1999,  Aon
charged general  expenses for $121 million in the consulting  segment to provide
for these payments.  As of December 31, 1999, Aon has $107 million  remaining in
general  expense  liabilities  for  these  payments  which  are  expected  to be
disbursed  over the next few years.  Aon's  ultimate  exposure  from the private
pension plan review, as presently calculated, is subject to a number of variable
factors  including,  among others,  equity markets,  the rate of response to the
pension review mailings,  the interest rate established quarterly by the PIA for
calculating  compensation and the precise scope, duration and methodology of the
review,  including whether recent regulatory guidance will have to be applied to
previously settled claims.

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  claims  will  not have a
material  adverse effect on the  consolidated  financial  position of Aon beyond
amounts provided.  However,  it is possible that future results of operations or
cash flows for any  particular  quarterly or annual  period could be  materially
affected by an unfavorable resolution of these matters.

                                     - 48 -
<PAGE>

14 SEGMENT INFORMATION
================================================================================

Aon  classifies  its  business  into three major  segments  based on the type of
service or product,  and a fourth nonoperating  segment. The Insurance Brokerage
and Other  Services  segment is  comprised of retail and  reinsurance  brokerage
operations,  which  include  specialty and wholesale  activity.  The  Consulting
segment is Aon's employee  benefit and human resource  consulting  organization.
The Insurance  Underwriting  segment is comprised of direct sales life, accident
and health,  extended  warranty,  specialty and other  insurance  products.  The
Corporate and Other segment revenues consist  primarily of investment  income on
capital.

Amounts reported in the tables for the four segments, when aggregated,  total to
the amounts in the accompanying consolidated financial statements.  Revenues are
attributed to geographic areas based on the location of the resources  producing
the  revenues.  Intercompany  revenues and expenses are  eliminated in computing
consolidated  revenues  and income  before  income  tax.  There are no  material
inter-segment   amounts  to  be  eliminated.   Long-lived   assets  and  related
depreciation and amortization are not material.

Selected information about Aon's operating and geographic areas of operation
follows:

CONSOLIDATED REVENUE BY GEOGRAPHIC AREA
(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
  United States                              $ 4,131     $ 3,736     $ 3,413
  United Kingdom                               1,352       1,244       1,158
  Continent of Europe                            841         790         439
  Rest of World                                  746         723         741
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
  Total                                      $ 7,070     $ 6,493     $ 5,751
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

INVESTMENT INCOME BY SEGMENT

(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
  Insurance brokerage and other
    services (primarily short-term
    investments)                               $ 159       $ 194       $ 163
  Consulting                                       3           6           6
  Insurance underwriting
    (primarily fixed maturities)                 251         240         214
  Corporate and other                            164         150         117
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
  Total                                        $ 577       $ 590       $ 500
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

INSURANCE BROKERAGE AND OTHER SERVICES
(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Revenue by geographic area:
  United States                              $ 2,146     $ 1,884     $ 1,670
  United Kingdom                                 830         798         733
  Continent of Europe                            680         626         317
  Rest of World                                  488         474         501
=============================================================================
Revenue by product:
  Retail                                     $ 2,831     $ 2,761     $ 2,327
  Reinsurance and wholesale                    1,313       1,021         894
                                             --------------------------------
  Total                                        4,144       3,782       3,221
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Operating expenses                             3,422       3,086       2,749
Amortization of intangibles                       38          33          36
                                             --------------------------------
  Total expenses                               3,460       3,119       2,785
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Income before income tax excluding
  special charges                                684         663         436
Special charges                                  191          --         132
                                             --------------------------------
  Income before income tax                   $   493     $   663     $   304
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Identifiable assets at December 31           $ 9,467     $ 9,006     $ 8,382
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

CONSULTING
(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Revenue by geographic area:
  United States                               $  405       $ 387       $ 358
  United Kingdom                                 147         134         131
  Continent of Europe                             44          36          18
  Rest of World                                   60          58          46
                                             --------------------------------
  Total                                          656         615         553
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Operating expenses                               573         544         491
Amortization of intangibles                        3           3           4
                                             --------------------------------
  Total expenses                                 576         547         495
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Income before income tax excluding
  special charges                                 80          68          58
Special charges                                  122          --          13
                                              -------------------------------
  Income (loss) before income tax             $  (42)      $  68       $  45
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Identifiable assets at December 31            $  248       $ 150       $ 141
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

                                     - 49 -
<PAGE>
INSURANCE UNDERWRITING
(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Revenue by geographic area:
  United States                              $ 1,457     $ 1,366     $ 1,308
  United Kingdom                                 349         290         274
  Continent of Europe                            115         117         102
  Rest of World                                  185         173         174
=============================================================================
Revenue by product:
  Direct sales                               $ 1,098     $ 1,053     $ 1,035
  Extended warranty                              730         643         574
  Specialty and other                            278         250         249
                                             --------------------------------
  Total                                        2,106       1,946       1,858
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Benefits to policyholders                        973         896         842
Operating expenses                               596         551         530
Amortization of deferred
  acquisition costs                              247         216         208
                                               ------------------------------
  Total expenses                               1,816       1,663       1,580
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
  Income before income tax                   $   290     $   283     $   278
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Identifiable assets at December 31           $ 5,640     $ 5,213     $ 4,936
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

CORPORATE AND OTHER
(millions)        Years ended December 31       1999        1998        1997
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Total revenue                                $   164     $   150     $   119
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Operating expenses                                63          60          26
Interest expense                                 105          87          70
Amortization of intangibles                      102          86          81
                                              -------------------------------
  Total expenses                                 270         233         177
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Loss before income tax excluding
  special charges                               (106)        (83)        (58)
Special charges                                   --          --          27
                                             --------------------------------
  Loss before income tax                     $  (106)    $   (83)    $   (85)
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------
Identifiable assets at December 31           $ 5,777     $ 5,319     $ 5,232
- - - - - - - - - - - - - - - - - -----------------------------------------------------------------------------

                                     - 50 -
<PAGE>

REPORTS BY INDEPENDENT AUDITORS AND MANAGEMENT

REPORT OF ERNST & YOUNG LLP,
INDEPENDENT AUDITORS

BOARD OF DIRECTORS AND STOCKHOLDERS
Aon CORPORATION

We have audited the accompanying  consolidated  statements of financial position
of  Aon  Corporation  as  of  December  31,  1999  and  1998,  and  the  related
consolidated statements of income, stockholders' equity, and cash flows for each
of the three  years in the period  ended  December  31,  1999.  These  financial
statements   are  the   responsibility   of  the   Company's   management.   Our
responsibility  is to express an opinion on these financial  statements based on
our audits.

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

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, the consolidated financial position of Aon Corporation at
December 31, 1999 and 1998, and the  consolidated  results of its operations and
its cash flows for each of the three  years in the  period  ended  December  31,
1999, in conformity with accounting  principles generally accepted in the United
States.

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

Chicago, Illinois
February 8, 2000



REPORT BY MANAGEMENT

The  management  of  Aon  Corporation  is  responsible  for  the  integrity  and
objectivity of the financial  statements and other financial  information in the
annual report.  The statements  have been prepared in conformity with accounting
principles  generally  accepted in the United States.  These statements  include
informed  estimates and judgments for those transactions not yet complete or for
which the ultimate effects cannot be measured precisely.  Financial  information
elsewhere in this report is consistent  with that in the  financial  statements.
The  consolidated  financial  statements  have been  audited by our  independent
auditors.  Their role is to render an independent  professional opinion on Aon's
financial statements.

Management  maintains  a  system  of  internal  control  designed  to  meet  its
responsibilities  for reliable financial  statements.  The system is designed to
provide reasonable assurance,  at appropriate costs, that assets are safeguarded
and that  transactions  are properly  recorded and executed in  accordance  with
management's  authorization.  Judgments  are  required to assess and balance the
relative  costs and  expected  benefits of those  controls.  It is  management's
opinion  that its  system of  internal  control as of  December  31,  1999,  was
effective in providing  reasonable  assurance that its financial statements were
free of material misstatement.  In addition, management supports and maintains a
professional  staff of internal  auditors who coordinate audit coverage with the
independent   auditors  and  conduct  an  extensive  program  of  financial  and
operational audits.

The Board of Directors selects an  Audit  Committee from  among its members.  No
member  of  the  Audit  Committee is an employee of Aon. The Audit Committee  is
responsible  for  recommending  appointment  of  the  independent  auditors  and
provides oversight relating to the review of financial  information provided  to
stockholders  and others,  the systems of internal  control which management and
the  board  of  directors  have  established  and  the audit process.  The Audit
Committee meets periodically  with management, internal auditors and independent
auditors  to review the work of each and  satisfy  itself that those parties are
properly  discharging their  responsibilities. Both the independent auditors and
the  internal  auditors  have free access to the  Audit  Committee,  without the
presence  of  management,  to discuss the  adequacy of internal  control and  to
review the quality of financial reporting.

                                     - 51 -
<PAGE>
<TABLE>
<CAPTION>
SELECTED FINANCIAL DATA

(millions except common stock and per share data)           1999           1998            1997           1996           1995
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>            <C>             <C>            <C>            <C>
INCOME STATEMENT DATA
      Brokerage commissions and fees                    $  4,639       $  4,197        $  3,605       $  1,919       $  1,651
      Premiums and other                                   1,854          1,706           1,646          1,577          1,473
      Investment income                                      577            590             500            392            342
                                                         ---------------------------------------------------------------------
            Total revenue                                  7,070          6,493           5,751          3,888          3,466
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------

      Income from continuing operations
            excluding special charges                   $    547       $    541        $    406       $    351       $    304
      Income from continuing operations                      352            541             299            292            304
      Discontinued operations                                 --             --              --             43             99
      Net income                                             352            541             299            335            403
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
DILUTIVE PER SHARE DATA*
      Income from continuing operations
            excluding special charges                   $   2.07       $   2.07        $   1.55       $   1.33       $   1.14
      Income from continuing operations                     1.33           2.07            1.12           1.10           1.14
      Discontinued operations                                 --             --              --           0.17           0.39
      Net income                                            1.33           2.07            1.12           1.27           1.53
BASIC PER SHARE DATA*
      Income from continuing operations                     1.35           2.11            1.14           1.11           1.15
      Net income                                            1.35           2.11            1.14           1.29           1.55
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
BALANCE SHEET DATA
ASSETS
      Investments                                       $  6,184       $  6,452        $  5,922       $  5,213       $ 10,639
      Brokerage and consulting receivables                 6,230          5,423           5,320          3,566          2,264
      Intangible assets                                    3,862          3,500           3,094          1,598          1,598
      Other                                                4,856          4,313           4,355          3,346          5,235
                                                        ----------------------------------------------------------------------
            Total assets                                $ 21,132       $ 19,688        $ 18,691       $ 13,723       $ 19,736
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
LIABILITIES AND STOCKHOLDERS' EQUITY
      Insurance premiums payable                        $  7,643       $  6,948        $  6,380       $  4,144       $  2,723
      Policy liabilities                                   4,988          4,823           4,450          4,360          9,556
      Notes payable                                        1,011            923             637            521            554
      General liabilities                                  3,589          3,127           3,552          1,815          4,179
                                                         ---------------------------------------------------------------------
            Total liabilities                             17,231         15,821          15,019         10,840         17,012
      Redeemable preferred stock                              50             50              50             50             50
      Capital securities                                     800            800             800             --             --
      Stockholders' equity                                 3,051          3,017           2,822          2,833          2,674
                                                        ----------------------------------------------------------------------
            Total liabilities and stockholders' equity  $ 21,132       $ 19,688        $ 18,691       $ 13,723       $ 19,736
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
COMMON STOCK DATA*
      Dividends paid per share                          $   0.82       $   0.73        $   0.68       $   0.63       $   0.59
      Stockholders' equity per share                       11.91          11.83           11.20          10.81          10.12
      Price range                                       46 2/3 -       50 3/8 -        39 1/4 -       28 3/4 -      22 9/16 -
                                                         26 1/16        32 3/16        26 13/16        21 1/16       13 15/16
      Market price at year-end                            40.000         36.917          39.083         27.583         22.167
      Common stockholders                                 13,757         12,294          12,698         13,030         13,520
      Shares outstanding (in millions)                     256.1          255.0           252.0          249.6          243.6
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
<FN>
* Per share  and  common  stock  data have been  restated  to  reflect  the 1999
  three-for-two stock split.
</FN>
</TABLE>

                                     - 52 -
<PAGE>
<TABLE>
<CAPTION>
QUARTERLY FINANCIAL DATA

(millions except common stock and per share data)             1Q             2Q              3Q             4Q           1999
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>           <C>             <C>            <C>            <C>
Income Statement Data
      Brokerage commissions and fees                     $ 1,112        $ 1,143         $ 1,127        $ 1,257        $ 4,639
      Premiums and other                                     437            441             475            501          1,854
      Investment income                                      150            139             168            120            577
                                                         ---------------------------------------------------------------------
            Total revenue                                  1,699          1,723           1,770          1,878          7,070
                                                         ---------------------------------------------------------------------
      Net income excluding special charges                   152            151             138            106            547
      Net income                                              50            151             138             13            352
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
DILUTIVE PER SHARE DATA*
      Net income excluding special charges               $  0.58        $  0.57         $  0.52        $  0.40        $  2.07
      Net income                                            0.19           0.57            0.52           0.05           1.33
BASIC NET INCOME PER SHARE*                                 0.19           0.58            0.53           0.05           1.35
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
COMMON STOCK DATA*
      Dividends paid per share                           $  0.19        $  0.21         $  0.21        $  0.21        $  0.82
      Stockholders' equity per share                       11.27          12.17           12.30          11.91          11.91
      Price range                                       45 1/3 -       46 2/3 -        43 1/8 -     41 11/16 -       46 2/3 -
                                                        32 11/16       39 13/16         29 1/16        26 1/16        26 1/16
      Shares outstanding (in millions)                     256.2          256.2           256.6          256.1          256.1
      Average monthly trading volume (in millions)           8.7            9.1             9.6           17.6           11.2
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

(millions except common stock and per share data)             1Q             2Q              3Q             4Q           1998
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>           <C>             <C>            <C>            <C>
INCOME STATEMENT DATA
      Brokerage commissions and fees                     $   996        $ 1,060         $ 1,023        $ 1,118        $ 4,197
      Premiums and other                                     417            423             431            435          1,706
      Investment income                                      148            140             153            149            590
                                                         ---------------------------------------------------------------------
            Total revenue                                  1,561          1,623           1,607          1,702          6,493
                                                         ---------------------------------------------------------------------
      Net income                                             138            140             124            139            541
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
DILUTIVE NET INCOME PER SHARE*                           $  0.53        $  0.54         $  0.47        $  0.53        $  2.07
BASIC NET INCOME PER SHARE*                                 0.55           0.55            0.48           0.54           2.11
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
COMMON STOCK DATA*
      Dividends paid per share                           $  0.17        $  0.19         $  0.19        $  0.19        $  0.73
      Stockholders' equity per share                       11.40          11.94           11.75          11.83          11.83
      Price range                                       44 2/3 -       48 1/6 -        50 3/8 -       42 3/4 -       50 3/8 -
                                                         36 1/12             41          39 1/4        32 3/16        32 3/16
      Shares outstanding (in millions)                     253.1          253.4           255.2          255.0          255.0
      Average monthly trading volume (in millions)           6.6            7.7             8.6           12.0            8.7
- - - - - - - - - - - - - - - - - ------------------------------------------------------------------------------------------------------------------------------
<FN>
* Per share  and  common  stock  data have been  restated  to  reflect  the 1999
  three-for-two stock split.
</FN>
</TABLE>

                                     - 53 -
<PAGE>
INFORMATION CONCERNING
FORWARD-LOOKING STATEMENTS

This annual report contains certain statements relating to future results, which
are forward-looking statements as that term is defined in the Private Securities
Litigation Reform Act of 1995. 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 general economic conditions in different countries around the
world,  fluctuations  in  global  equity  and  fixed  income  markets,  downward
commercial property and casualty premium pressures,  the competitive environment
and the actual cost of resolution of contingent liabilities. Further information
concerning  the company and its  business,  including  factors that  potentially
could  materially  affect the company's  financial  results are contained in the
company's filings with the Securities and Exchange Commission.



STRUCTURE OF OPERATING BUSINESSES

Aon  Corporation  is a holding  company.  Its separate  subsidiary  corporations
conduct   operations.   References  herein  to  "Aon"  usually  relate  to  such
subsidiaries,  individually  or in the aggregate,  but on occasion may relate to
Aon Corporation.  Express references to "Aon Corporation"  relate to the holding
company.  Operating  businesses are principally involved in insurance brokerage,
consulting and insurance underwriting; however, references in this annual report
are not intended to be a complete or inclusive list of our businesses.


                                     - 54 -
<PAGE>

                                                                      Exhibit 21
<TABLE>
<CAPTION>
Aon Corporation and its Subsidiaries (as of December 31, 1999)

<S>                                                                                       <C>
Aon Corporation                                                                           Delaware
120524 Canada Inc.                                                                        Canada
1e Katharinastrase 29 Vermogensverwaltungsges mbH                                         Germany
2e Katharinastrase 29 Vermogensverwaltungsges mbH                                         Germany
A Morel & Cie Sa                                                                          France
A&A (UK) Limited                                                                          United Kingdom
A. J. Norcott & Company (Holdings) Limited                                                United Kingdom
A. J. Norcott & Partners (Northern) Limited                                               United Kingdom
A. J. Norcott & Partners (Scotland) Limited                                               United Kingdom
A. J. Norcott & Partners Limited                                                          United Kingdom
A. J. Norcott Benefit Consultants Limited                                                 United Kingdom
A.G.Y.C. Corretores de Seguros Ltda.                                                      Portugal
A.H. Laseur B.V.                                                                          Netherlands
A.H.E. Alexander Howden de Espana S.A.                                                    Spain
A.H.G. Far East Ltd.                                                                      Hong Kong
A.H.O.H. (Bermuda) Limited                                                                Bermuda
A/S Assurance                                                                             Norway
AA & JG Denison & Company Ltd.                                                            United Kingdom
AARE Corporation                                                                          New York
ABS Insurance Agency Ltd.                                                                 United Kingdom
Acedale Co. Ltd.                                                                          Hong Kong
ACGMGA Corp.                                                                              Texas
ACN 004 192 394                                                                           Australia
ACN 006 278 226                                                                           Australia
ACN 008 497 318                                                                           Australia
ACN 051 158 984                                                                           Australia
ACN 075 486 243                                                                           Australia
ACP Insurance Agency, Inc.                                                                Texas
Administradora Centurion Ltda                                                             Colombia
Admiseg SA                                                                                Argentina
Adviser 151 Limited                                                                       United Kingdom
Affinity Insurance Services of Washington, Inc.                                           Washington
Affinity Insurance Services, Inc.                                                         Pennsylvania
Agencia Interoceanica de Subscripcion y Administracion S. A.                              Mexico
AGISA, S.A.                                                                               Mexico
Agostini Insurance Brokers Ltd.                                                           Trinidad
Agricola Training Limited                                                                 United Kingdom
Agricola Underwriting Limited                                                             United Kingdom
Agricola Underwriting Management Limited                                                  New Zealand
Agricola Underwriting Management Pty Ltd.                                                 Australia
Agricultural Risk Management (Pacific) Ltd                                                New Zealand
Agricultural Risk Management Argentina S.A.                                               Argentina
Agricultural Risk Management Chile                                                        Chile

                                     - 1 -
<PAGE>
Agricultural Risk Management North America, Inc.                                          Kansas
Agricultural Risk Management Pty. Ltd.                                                    Australia
Agricultural Risk Management, Limited                                                     United Kingdom
Agte Gebruder GmbH                                                                        Germany
Aidec Ciskei (Pty) Ltd.                                                                   South Africa
Aidec Gazankulu (Pty) Limited                                                             South Africa
Aidec Kangwane (Pty) Limited                                                              South Africa
Aidec Kwandebele (Pty) Limited                                                            South Africa
Aidec Lebowa (Pty) Limited                                                                South Africa
Aidec M.I.B. North West (Pty) Limited                                                     South Africa
Aidec Venda (Pty) Limited                                                                 South Africa
Air-Con Solution Ltd.                                                                     Thailand
Aircrew Underwriting Agencies Ltd.                                                        United Kingdom
Airscope Insurance Services Limited                                                       United Kingdom
AIS Affinity Insurance Agency of New England, Inc.                                        Massachusetts
AIS Affinity Insurance Agency, Inc.                                                       California
AIS Management Corporation                                                                California
Aldebaran S.R.L. Rome                                                                     Italy
Alexander & Alexander (C.I.) Limited                                                      Guernsey
Alexander & Alexander (Hong Kong) Holdings Limited                                        Hong Kong
Alexander & Alexander (Ireland) Limited                                                   Ireland
Alexander & Alexander (Isle of Man) Limited                                               United Kingdom
Alexander & Alexander (Malaysia) Sdn. Bhd.                                                Malaysia
Alexander & Alexander (Taiwan) Ltd.                                                       Taiwan
Alexander & Alexander (Thailand) Ltd.                                                     Thailand
Alexander & Alexander Asia Holdings Pte. Ltd.                                             Singapore
Alexander & Alexander B.V.                                                                Netherlands
Alexander & Alexander Benefits Services of Louisiana Inc.                                 Louisiana
Alexander & Alexander Colombia Ltda.                                                      Colombia
Alexander & Alexander Consultants S.A.                                                    France
Alexander & Alexander Corretores e Consultores de Seguros Lda.                            Portugal
Alexander & Alexander Europe GmbH                                                         Austria
Alexander & Alexander Europe Ltd.                                                         United Kingdom
Alexander & Alexander Far East Partners                                                   Hong Kong
Alexander & Alexander Galicia, S.A.                                                       Spain
Alexander & Alexander Holdings B.V.                                                       Netherlands
Alexander & Alexander Insurance Benefits Services Inc.                                    Massachusetts
Alexander & Alexander Insurance Brokers - Hungary                                         Hungary
Alexander & Alexander Insurance Brokers Ltd. Poland                                       Poland
Alexander & Alexander International Inc.                                                  Maryland
Alexander & Alexander Korea Inc.                                                          Korea
Alexander & Alexander Limited                                                             United Kingdom
Alexander & Alexander Ltd.                                                                Fiji
Alexander & Alexander Ltd.                                                                New Zealand
Alexander & Alexander Ltd. (Thailand)                                                     Thailand
Alexander & Alexander Mexico Agente de Seguros y de Fianza S.A. de C.V.                   Mexico
Alexander & Alexander Middle East Limited                                                 Bermuda

                                     - 2 -
<PAGE>
Alexander & Alexander of Colombia Ltda.                                                   Colombia
Alexander & Alexander of Kansas, Inc.                                                     Kansas
Alexander & Alexander of Missouri Inc.                                                    Missouri
Alexander & Alexander of Virginia, Inc.                                                   Virginia
Alexander & Alexander of Washington Inc.                                                  Washington
Alexander & Alexander Pte. Ltd.                                                           Singapore
Alexander & Alexander Risk Management Services, Inc.                                      Taiwan
Alexander & Alexander S.R.O. (Czech. Republic)                                            Czech Republic
Alexander & Alexander Services (India) Pvt. Ltd.                                          India
Alexander & Alexander Services Canada Inc.                                                Canada
Alexander & Alexander Services UK Limited                                                 Scotland
Alexander & Alexander Sigorta Musavirlk Anomim Sirketi                                    Turkey
Alexander & Alexander Spain Correduria de Seguros, S.A.                                   Spain
Alexander & Alexander Trustee Jersey Ltd.                                                 Jersey, Channel Islands
Alexander & Alexander U.K. Pension Trustees Ltd.                                          United Kingdom
Alexander & Alexander, Inc.                                                               Oklahoma
Alexander & Alexander, Inc.                                                               West Virginia
Alexander & Davidson de Colombia LTDA.                                                    Colombia
Alexander Administration Services Ltd.                                                    Isle of Man
Alexander Clay                                                                            Scotland
Alexander Clay Communications Limited                                                     United Kingdom
Alexander Consulting Groep B.V.                                                           Netherlands
Alexander Consulting Investment Services Inc.                                             Maryland
Alexander Coyle Hamilton Ltd.                                                             Ireland
Alexander Financial Services Ltd.                                                         Scotland
Alexander Hellas E.P.E.                                                                   Greece
Alexander Howden (Hellas) Ltd.                                                            Guernsey
Alexander Howden (Kazakhstan) Ltd.                                                        Kazakhstan
Alexander Howden Asia Pacific Ltd.                                                        United Kingdom
Alexander Howden Canada Limited                                                           Canada
Alexander Howden de Espana                                                                Spain
Alexander Howden Del Peru S.A. Reinsurance Brokers                                        Peru
Alexander Howden Energy & Partners Scandinavia                                            Norway
Alexander Howden Far East Ptd. Ltd.                                                       Singapore
Alexander Howden Financial Services Limited                                               United Kingdom
Alexander Howden Group (Asia) Pte. Ltd.                                                   Singapore
Alexander Howden Group (Australia) Limited                                                Australia
Alexander Howden Group (Bermuda) Limited                                                  Bermuda
Alexander Howden Holdings Limited                                                         United Kingdom
Alexander Howden Insurance Services of Texas, Inc.                                        Texas
Alexander Howden International Limited                                                    United Kingdom
Alexander Howden Leasing Ltd.                                                             United Kingdom
Alexander Howden Limited                                                                  United Kingdom
Alexander Howden North America, Inc.                                                      Georgia
Alexander Howden North America, Inc.                                                      Massachusetts
Alexander Howden North America, Inc.                                                      New York
Alexander Howden North America, Inc.                                                      Ohio

                                     - 3 -
<PAGE>
Alexander Howden North America, Inc.                                                      Texas
Alexander Howden Ossa De Colombia SA                                                      Colombia
Alexander Howden Previsionales y Personas Ltda.                                           Colombia
Alexander Howden Reinsurance Brokers (Australia) Ltd.                                     Australia
Alexander Howden Reinsurance Intermediaries, Inc.                                         New York
Alexander Howden UK Limited                                                               United Kingdom
Alexander Howden Underwriting Limited                                                     United Kingdom
Alexander Howden Y Asociados S.A. de C.V.                                                 Mexico
Alexander Insurance Managers (Barbados) Ltd.                                              Barbados
Alexander Insurance Managers (Cayman) Ltd.                                                Cayman Islands
Alexander Insurance Managers (Dublin) Ltd.                                                Ireland
Alexander Insurance Managers (Guernsey) Ltd.                                              Guernsey
Alexander Insurance Managers (Holdings) Ltd.                                              Guernsey
Alexander Insurance Managers (Isle of Man) Ltd.                                           Isle of Man
Alexander Insurance Managers (Jersey) Ltd.                                                Jersey, Channel Islands
Alexander Insurance Managers (Luxembourg) S.A.                                            Luxembourg
Alexander Insurance Managers Ltd.                                                         Bermuda
Alexander Insurance Managers N.V.                                                         Netherlands
Alexander Lippo (Hong Kong) Ltd.                                                          Hong Kong
Alexander of Texas Inc.                                                                   Texas
Alexander Portfolio Management Ltd.                                                       New Zealand
Alexander R.M.C. Brown Partners Ltd.                                                      Australia
Alexander Reinsurance Intermediaries, Inc.                                                New York
Alexander Services, Inc.                                                                  Illinois
Alexander Stenhouse & Partners Limited                                                    Scotland
Alexander Stenhouse Belgium International                                                 Belgium
Alexander Stenhouse Limited                                                               United Kingdom
Alexander Stenhouse Magee Limited                                                         Ireland
Alexander Stenhouse Management Services Ltd.                                              Scotland
Alexander Stenhouse Nominees Ltd.                                                         Australia
Alexander Stenhouse Risk Management S.A.                                                  Spain
Alexander Underwriting Agencies Limited                                                   Bermuda
Alexander Underwriting Services Inc.                                                      Maryland
Alexander Underwriting Services Limited                                                   United Kingdom
Alexander Watkins S.A. de C.V.                                                            Mexico
Alexander, Ayling, Barrios & Cia, S.A.                                                    Argentina
Algemeen Asurantiekantoor van 1863 Justin van de Port bv                                  Netherlands
Allen Insurance Associates, Inc.                                                          California
Alpenbeck Limited                                                                         United Kingdom
American Special Risk Insurance Company                                                   Delaware
Anchor Reinsurance Company, Ltd.                                                          Bermuda
Anchor Underwriting Managers, Ltd.                                                        Bermuda
Anderson and Anderson Insurance Brokers, Inc.                                             California
Anderson and Anderson of Los Angeles Insurance Brokers, Inc.                              California
Anderson and Anderson of Orange County Insurance Brokers, Inc.                            California
Anderson and Anderson/Benefits Insurance Brokers, Inc.                                    California
Anderson and Anderson/D-K&S Insurance Brokers, Inc.                                       California

                                     - 4 -
<PAGE>
Andes Global Ltd.                                                                         Brit. Virgin Islands
Andrea Scagliarni Assicurazione                                                           Italy
Anglo-Swiss Reinsurance Brokers Ltd.                                                      Switzerland
Anistics Ltd.                                                                             United Kingdom
ANR Engineering Limited                                                                   United Kingdom
Anscor Insurance Brokers Inc.                                                             Philippines
Aon  Hudig cv                                                                             Netherlands
Aon  WACUS Kreditversicherungsmakler GmbH & Co.                                           Germany
Aon  WACUS Verwaltungs GmbH                                                               Germany
Aon (Panama) Ltd. S.A.                                                                    Panama
Aon Acquisition Corporation of Arkansas                                                   Arkansas
Aon Acquisition Corporation of New Jersey                                                 New Jersey
Aon Adjudication Services Limited                                                         United Kingdom
Aon Administrative Services Corp.                                                         California
Aon Advisors (U.K.) Limited                                                               United Kingdom
Aon Advisors, Inc.                                                                        Virginia
Aon Aisa Ltd                                                                              Hong Kong
Aon Alexander & Alexander N.V.                                                            Belgium
Aon Andueza Nikols, Corredores de Seguros S.A.                                            Chile
Aon Annuity Group, Inc.                                                                   Texas
Aon Antillen nv                                                                           Netherland Antilles
Aon Artscope Kunstversicherungsmakler  GmbH                                               Germany
Aon Aruba nv                                                                              Netherland Antilles
Aon Asia Insurance Services bv                                                            Netherlands
Aon Assurances Credit SA                                                                  France
Aon Aviation, Inc.                                                                        Illinois
Aon Bain Hogg Limited                                                                     United Kingdom
Aon Belgium nv                                                                            Belgium
Aon Benefit Services, Inc.                                                                Massachusetts
Aon Benefits Insurance Brokers (Singapore) Pte. Ltd.                                      Singapore
Aon BEP Inc.                                                                              Quebec
Aon Boels & Begault S.A.                                                                  Belgium
Aon Brasil Resseguros Ltda                                                                Brazil
Aon Brazil Corretores de Seguros Ltda.                                                    Brazil
Aon Broker Services, Inc.                                                                 Illinois
Aon Broking Services S.A.                                                                 Argentina
Aon Canada Inc.                                                                           Canada
Aon Capital A                                                                             Delaware
Aon Capital Management, Inc.                                                              Delaware
Aon Captive Management, Ltd.                                                              U.S. Virgin Islands
Aon Captive Services (Nederland) bv                                                       Netherlands
Aon Captive Services Antillen nv                                                          Netherland Antilles
Aon Captive Services Aruba nv                                                             Netherland Antilles
Aon Centurion S.A. Corredores de Seguros                                                  Colombia
Aon Ceska republika spol. s.r.o.                                                          Czech Republic
Aon Colombia S.A. Corredores de Seguros                                                   Colombia
Aon Commercial Risks Hong Kong Ltd.                                                       Hong Kong

                                     - 5 -
<PAGE>
Aon Compensation and Benefits Limited                                                     United Kingdom
Aon Conseil Assurances de Personnes SA                                                    France
Aon Consulting & Insurance Services                                                       California
Aon Consulting (Malaysia) Sdn Bhd.                                                        Malaysia
Aon Consulting Agency, Inc.                                                               Texas
Aon Consulting Belgium S.A.                                                               Belgium
Aon Consulting Chile Limitada                                                             Chile
Aon Consulting Consultores de Seguros Ltda.                                               Brazil
Aon Consulting Denmark A/S                                                                Denmark
Aon Consulting Financial Services Limited                                                 United Kingdom
Aon Consulting GmbH                                                                       Germany
Aon Consulting Group Limited                                                              United Kingdom
Aon Consulting Hong Kong Ltd.                                                             Hong Kong
Aon Consulting Inc.                                                                       Canada
Aon Consulting Limited                                                                    United Kingdom
Aon Consulting Nederland cv                                                               Netherlands
Aon Consulting New Zealand Ltd.                                                           New Zealand
Aon Consulting of Maryland, Inc.                                                          Maryland
Aon Consulting Pty Limited                                                                Australia
Aon Consulting S.A.                                                                       Colombia
Aon Consulting South Africa (Pty) Ltd.                                                    South Africa
Aon Consulting Thailand Ltd.                                                              Thailand
Aon Consulting Worldwide, Inc.                                                            Maryland
Aon Consulting, Inc.                                                                      Florida
Aon Consulting, Inc.                                                                      New Jersey
Aon Consulting, Inc.                                                                      New York
Aon Consulting, Inc.                                                                      Ohio
Aon Consulting, Inc.                                                                      Texas
Aon Consulting, Inc. of Arizona                                                           Arizona
Aon Consulting, Limited                                                                   Quebec
Aon Consulting, S.A. de C.V.                                                              Mexico
Aon Corporation Australia Limited                                                         Australia
Aon Credit Services Corporation                                                           Delaware
Aon CSC Corredores de Reaseguros Limitada                                                 Chile
Aon Denmark A/S                                                                           Denmark
Aon Direct Group Inc.                                                                     Canada
Aon Direct Group Small Company Life and Health Agents                                     Illinois
Aon Direct Research & Analytics Group Inc.                                                Canada
Aon Employee Risk Solutions Limited                                                       United Kingdom
Aon Enterprise Insurance Services, Inc.                                                   Illinois
Aon Enterprise Insurance Services, Inc.                                                   Texas
Aon Entertainment Risk Services Limited                                                   United Kingdom
Aon Finance Limited                                                                       United Kingdom
Aon Financial Planning Ltd.                                                               Australia
Aon Financial Products, Inc.                                                              Delaware
Aon Financial Services Group of Colorado, Inc.                                            Colorado
Aon Financial Services Group of New York, Inc.                                            New York

                                     - 6 -
<PAGE>
Aon Financial Services Group, Inc.                                                        California
Aon Financial Services Group, Inc.                                                        Illinois
Aon Financial Services Group, Inc.                                                        Pennsylvania
Aon Financial Services Group, Inc.                                                        Texas
Aon Financial Services Limited                                                            United Kingdom
Aon Finland OY                                                                            Finland
Aon Forfaiting Limited                                                                    United Kingdom
Aon France S.A.                                                                           France
Aon Funds                                                                                 Delaware
Aon General Agency, Inc.                                                                  Texas
Aon General Consulting Ltda.                                                              Brazil
Aon GGI Acquisition Corporation, Inc.                                                     Texas
Aon Gil y Carvajal Flotas, SA                                                             Spain
Aon Gil y Carvajal Portugal - Corretores de Seguros SA                                    Portugal
Aon Global Risk Consultants Limited                                                       United Kingdom
Aon Grieg AS                                                                              Norway
Aon Grieg P&I AS                                                                          Norway
Aon Groep Nederland bv                                                                    Netherlands
Aon Group Corretagem, Administracao e Consultoria de Seguros Ltda                         UK
Aon Group Limited                                                                         United Kingdom
Aon Group Limited de Argentina S.A.                                                       Argentina
Aon Group Limited de Mexico, Intermediario de Reaseguro, S.A. de C.V.                     Mexico
Aon Group Ltd. Peru S.A.                                                                  Peru
Aon Group New Zealand Ltd.                                                                New Zealand
Aon Group Venezuela, Corretaje de Reaseguro, C.A.                                         Venezuela
Aon Group, Inc.                                                                           Maryland
Aon Hamond & Regine, Inc.                                                                 New York
Aon Hazard Limited                                                                        United Kingdom
Aon Health Services Inc.                                                                  Texas
Aon Healthcare Insurance Services of Arizona, Inc.                                        Arizona
Aon Healthcare Insurance Services, Inc.                                                   California
Aon Hellas A.E.                                                                           Greece
Aon Holdings Antillen nv                                                                  Netherland Antilles
Aon Holdings Australia Ltd.                                                               Australia
Aon Holdings Belgium nv                                                                   Belgium
Aon Holdings bv                                                                           Netherlands
Aon Holdings Denmark A/S                                                                  Denmark
Aon Holdings Hong Kong Limited                                                            Hong Kong
Aon Holdings International BV                                                             Netherlands
Aon Holdings New Zealand  Ltd.                                                            New Zealand
Aon Home Warranty Services, Inc.                                                          Delaware
Aon Hudig Groningen bv                                                                    Netherlands
Aon Hudig Hengelo bv                                                                      Netherlands
Aon Hudig Nijmegen bv                                                                     Netherlands
Aon Hudig Noordwijk bv                                                                    Netherlands
Aon Hudig Tilburg bv                                                                      Netherlands
Aon Hudig Venlo bv                                                                        Netherlands

                                     - 7 -
<PAGE>
Aon Hudig-Schreinemacher vof                                                              Netherlands
Aon India Limited                                                                         United Kingdom
Aon Innovative Solutions, Inc.                                                            Missouri
Aon Insurance Management Agencies (Hong Kong) Ltd.                                        Hong Kong
Aon Insurance Management Services - Virgin Islands, Inc.                                  U.S. Virgin Islands
Aon Insurance Management Services, Inc.                                                   Delaware
Aon Insurance Managers (Antilles) nv                                                      Netherland Antilles
Aon Insurance Managers (Bermuda) Ltd.                                                     Bermuda
Aon Insurance Managers (Singapore) Pte. Ltd.                                              Singapore
Aon Insurance Managers (USA) Inc.                                                         Vermont
Aon Insurance Services                                                                    California
Aon Insurance Services, Inc.                                                              Pennsylvania
Aon Intermediaries (Bermuda) Ltd.                                                         Bermuda
Aon International bv                                                                      Netherlands
Aon Investment Consulting Inc.                                                            Florida
Aon Investment Holdings, Inc.                                                             Delaware
Aon Investor Strategies, Inc.                                                             Delaware
Aon Italia SpA                                                                            Italy
Aon Jauch & Hubener Consulting GmbH                                                       Germany
Aon Jauch & Hubener GmbH                                                                  Germany
Aon Jauch & Hubener Holdings Gmbh                                                         Germany
Aon Jauch & Hubener Privates Vorsorgemanagement GmbH                                      Germany
Aon Jauch & Hubener Versicherungsconsulting Ges. mbH                                      Austria
Aon Jauch & Hubener Verwaltungs- GmbH                                                     Germany
Aon Life Agency of Texas, Inc.                                                            Texas
Aon Lumley Consulting (Pty) Ltd.                                                          South Africa
Aon Lumley South Africa (Pty) Ltd.                                                        South Africa
Aon Magyarorszag Alkusz Kft.                                                              Hungary
Aon Makelaars in Assurantien bv                                                           Netherlands
Aon Malta Ltd.                                                                            Malta
Aon Managed Care Risk & Insurance Services, Inc.                                          California
Aon Manzitti S.p.A.                                                                       Italy
Aon Mibrag Versicherungsvermittlungs GmbH                                                 Germany
Aon Middle East                                                                           United Arab Emirates
Aon Minet Ltd.                                                                            New Zealand
Aon Mozambique Ltd.                                                                       Mozambique
Aon Natural Resources Asia Ltd.                                                           Labuan
Aon Nikols Adriatica Srl                                                                  Italy
Aon Nikols bv                                                                             Netherlands
Aon Nikols Chile bv                                                                       Netherlands
Aon Nikols Colombia Holdings SA                                                           Colombia
Aon Nikols Latin America bv                                                               Netherlands
Aon Nikols N.E. SpA                                                                       Italy
Aon Nikols NBB Srl                                                                        Italy
Aon Nikols Srl                                                                            Italy
Aon Nikols Torino Srl.                                                                    Italy
Aon Nominees Limited                                                                      United Kingdom

                                     - 8 -
<PAGE>
Aon Ossa Ltda, Corredores de Reaseguros                                                   United Kingdom
Aon Overseas Holdings Limited                                                             United Kingdom
Aon OWA Insurance Services GmbH & Co.                                                     Germany
Aon OWA Verwaltungs GmbH                                                                  Germany
Aon Partnership Limited                                                                   United Kingdom
Aon Pension Trustees Limited                                                              United Kingdom
Aon PHI Acquisition Corporation of California                                             California
Aon Pilar Corretora E Servicos de Seguros S/C Ltda.                                       Brazil
Aon Polska sp.z.o.o.                                                                      Poland
Aon Previsonals y Personas Ltda, Corredores de Reaseguros y Consultores                   United Kingdom
Aon Private Risk Management Insurance Agency, Inc.                                        Illinois
Aon Properties Limited                                                                    United Kingdom
Aon Pyramid International Limited                                                         United Kingdom
Aon Re (Bermuda) Ltd.                                                                     Bermuda
Aon Re (Thailand) Ltd.                                                                    Thailand
Aon Re Africa (Pty) Ltd.                                                                  South Africa
Aon Re Aviation Limited                                                                   United Kingdom
Aon Re Belgium nv                                                                         Belgium
Aon Re Canada Inc.                                                                        Canada
Aon Re China Ltd.                                                                         Hong Kong
Aon Re Iberia SA                                                                          Spain
Aon Re Inc.                                                                               Illinois
Aon Re Latinoamericana, S.A.                                                              Mexico
Aon Re Netherlands cv                                                                     Netherlands
Aon Re Non-Marine Limited                                                                 United Kingdom
Aon Re Panama, S.A.                                                                       Panama
Aon Re Special Risks Limited                                                              United Kingdom
Aon Re UK Limited                                                                         United Kingdom
Aon Re Worldwide, Inc.                                                                    Delaware
Aon Real Estate Services, Inc.                                                            New York
Aon Reed Stenhouse Inc.                                                                   Canada
Aon Reinsurance Brokers Asia Pte Ltd.                                                     Singapore
Aon Risconcept Inc.                                                                       Canada
Aon Risk Consultants (Bermuda ) Ltd.                                                      Bermuda
Aon Risk Consultants (Europe) Limited                                                     United Kingdom
Aon Risk Consultants bv                                                                   Netherlands
Aon Risk Consultants, Inc.                                                                Illinois
Aon Risk Management A/S                                                                   Denmark
Aon Risk Management Services Italia srl.                                                  Italy
Aon Risk Managers, Inc.                                                                   Illinois
Aon Risk Resources Insurance Agency, Inc.                                                 Illinois
Aon Risk Resources Limited                                                                United Kingdom
Aon Risk Resources, Inc.                                                                  Delaware
Aon Risk Services  (PNG) Pty. Ltd.                                                        Papau New Guinea
Aon Risk Services (Barbados) Ltd.                                                         Barbados
Aon Risk Services (Cayman) Ltd.                                                           Cayman Islands
Aon Risk Services (Chile) S.A.                                                            Chile

                                     - 9 -
<PAGE>
Aon Risk Services (Europe) S.A.                                                           Luxembourg
Aon Risk Services (Fiji) Ltd.                                                             Fiji
Aon Risk Services (Holdings) of Latin America, Inc.                                       Delaware
Aon Risk Services (Holdings) of the Americas, Inc.                                        Illinois
Aon Risk Services (Ireland) Limited                                                       Ireland
Aon Risk Services (Thailand) Ltd.                                                         Thailand
Aon Risk Services (Vanuatu) Ltd.                                                          Vanuatu
Aon Risk Services (Western Samoa) Ltd.                                                    American Samoa
Aon Risk Services Agente de Seguros y de Fianzas, S.A. de C.V.                            Mexico
Aon Risk Services Argentina SA                                                            Argentina
Aon Risk Services Australia Ltd.                                                          Australia
Aon Risk Services Canada Inc.                                                             Canada
Aon Risk Services Companies, Inc.                                                         Maryland
Aon Risk Services Do Brazil Corretores de Seguros Ltda.                                   Brazil
Aon Risk Services Holdings (Chile) Ltda.                                                  Chile
Aon Risk Services Holdings UK Limited                                                     United Kingdom
Aon Risk Services Hong Kong Ltd.                                                          Hong Kong
Aon Risk Services International (Holdings) Inc.                                           Delaware
Aon Risk Services International Limited                                                   United Kingdom
Aon Risk Services Japan Ltd.                                                              Japan
Aon Risk Services Limited                                                                 United Kingdom
Aon Risk Services New Zealand Pty. Ltd.                                                   New Zealand
Aon Risk Services of Missouri, Inc.                                                       Missouri
Aon Risk Services of Texas, Inc.                                                          Texas
Aon Risk Services Singapore (Insurance Brokers) Pte. Ltd.                                 Singapore
Aon Risk Services Solomon Islands Ltd.                                                    Solomon Islands
Aon Risk Services Taiwan Ltd.                                                             Taiwan
Aon Risk Services UK Limited                                                              United Kingdom
Aon Risk Services, Inc. of Alabama                                                        Alabama
Aon Risk Services, Inc. of Arizona                                                        Arizona
Aon Risk Services, Inc. of Arkansas                                                       Arkansas
Aon Risk Services, Inc. of Central California Insurance Services                          California
Aon Risk Services, Inc. of Colorado                                                       Colorado
Aon Risk Services, Inc. of Connecticut                                                    Connecticut
Aon Risk Services, Inc. of Florida                                                        Florida
Aon Risk Services, Inc. of Georgia                                                        Georgia
Aon Risk Services, Inc. of Hawaii                                                         Hawaii
Aon Risk Services, Inc. of Idaho                                                          Idaho
Aon Risk Services, Inc. of Illinois                                                       Illinois
Aon Risk Services, Inc. of Indiana                                                        Indiana
Aon Risk Services, Inc. of Kansas                                                         Kansas
Aon Risk Services, Inc. of Kentucky                                                       Kentucky
Aon Risk Services, Inc. of Louisiana                                                      Louisiana
Aon Risk Services, Inc. of Maryland                                                       Maryland
Aon Risk Services, Inc. of Massachusetts                                                  Massachusetts
Aon Risk Services, Inc. of Michigan                                                       Michigan
Aon Risk Services, Inc. of Minnesota                                                      Minnesota

                                     - 10 -
<PAGE>
Aon Risk Services, Inc. of Montana                                                        Montana
Aon Risk Services, Inc. of Nebraska                                                       Nebraska
Aon Risk Services, Inc. of Nevada                                                         Nevada
Aon Risk Services, Inc. of New Jersey                                                     New Jersey
Aon Risk Services, Inc. of New Mexico                                                     New Mexico
Aon Risk Services, Inc. of New York                                                       New York
Aon Risk Services, Inc. of Northern California Insurance Services                         California
Aon Risk Services, Inc. of Ohio                                                           Ohio
Aon Risk Services, Inc. of Oklahoma                                                       Oklahoma
Aon Risk Services, Inc. of Oregon                                                         Oregon
Aon Risk Services, Inc. of Pennsylvania                                                   Pennsylvania
Aon Risk Services, Inc. of Rhode Island                                                   Rhode Island
Aon Risk Services, Inc. of Southern California Insurance Services                         California
Aon Risk Services, Inc. of Tennessee                                                      Tennessee
Aon Risk Services, Inc. of the Carolinas                                                  North Carolina
Aon Risk Services, Inc. of Utah                                                           Utah
Aon Risk Services, Inc. of Virginia                                                       Virginia
Aon Risk Services, Inc. of Washington                                                     Washington
Aon Risk Services, Inc. of Washington, D.C.                                               District of Columbia
Aon Risk Services, Inc. of Wisconsin                                                      Wisconsin
Aon Risk Services, Inc. of Wyoming                                                        Wyoming
Aon Risk Services, Inc. U.S.A.                                                            New York
Aon Risk Technologies, Inc.                                                               Delaware
Aon S.G.C.A.                                                                              France
Aon Securities Corporation                                                                New York
Aon Select, Inc.                                                                          Pennsylvania
Aon Service Corporation                                                                   Illinois
Aon Services Group Limited                                                                United Kingdom
Aon Services Group of Tennessee, Inc.                                                     Tennessee
Aon Services Group, Inc.                                                                  Delaware
Aon Sigorta Brokerlik ve Musavirlik AS                                                    Turkey
Aon Slovensko spol.s r.o.                                                                 Slovak Republic
Aon South Africa (Pty) Ltd.                                                               South Africa
Aon Southern Europe b.v.                                                                  Netherlands
Aon Space SA                                                                              France
Aon Space, Inc.                                                                           District of Columbia
Aon Special Risk Resources Limited                                                        United Kingdom
Aon Special Risk Resources, Inc.                                                          Delaware
Aon Special Risks, Inc.                                                                   Illinois
Aon Specialty  Denmark A/S                                                                Denmark
Aon Specialty Re, Inc.                                                                    Illinois
Aon Stockholm                                                                             Sweden
Aon Superannuation Pty Limited                                                            Australia
Aon Surety & Guarantee Limited                                                            United Kingdom
Aon Sweden AB                                                                             Sweden
Aon Tanzania Ltd.                                                                         Tanzania
Aon Technical Insurance Services, Inc.                                                    Illinois

                                     - 11 -
<PAGE>
Aon Trade Credit Insurance Brokers S.r.l.                                                 Italy
Aon Trade Credit Insurance Services, Inc.                                                 California
Aon Trade Credit, Inc.                                                                    Illinois
Aon Trade Credit, Inc.                                                                    New York
Aon UK Holdings Limited                                                                   United Kingdom
Aon UK Limited                                                                            United Kingdom
Aon UK Trustees Limited                                                                   United Kingdom
Aon Underwriting Agancies (Hong Kong) Ltd.                                                Hong Kong
Aon Vietnam                                                                               Vietnam
Aon Warranty Group Limited (UK)                                                           United Kingdom
Aon Warranty Group, Inc.                                                                  Illinois
Aon Warranty Korea, Inc.                                                                  Korea
Aon Warranty Services do Brasil Ltda.                                                     Brazil
Aon Warranty Services, Inc.                                                               Illinois
Aon Worldwide Resources, Inc.                                                             Illinois
Aon/Albert G. Ruben Company (New York) Inc.                                               New York
Aon/Albert G. Ruben Insurance Services, Inc.                                              California
Aon/Brockinton Agency of Texas, Inc.                                                      Texas
Aon/Saiz Limitada Barranquilla Corredores de Seguros                                      Colombia
Aon-Baoviet Inchcape Insurance Services Limited                                           Vietnam
Aongyc - Resseguros e Consultores de Seguros, Ltda                                        Portugal
AOPA Insurance Agency, Inc.                                                               Maryland
AOPA Insurance Agency, Inc.                                                               Texas
APAC (Alliance Pour l'Assurance Credit) Sarl                                              France
APM Services Limited                                                                      Hong Kong
Aporia Leasing Limited                                                                    United Kingdom
APS International Limited                                                                 United Kingdom
APS Life & Pensions Limited                                                               United Kingdom
Argenbroker Buenos Aires                                                                  Argentina
ARM COVERAGE INC.                                                                         New York
ARS Holdings, Inc.                                                                        Louisiana
Artemis Securities Ltd.                                                                   Guernsey
Artscope Insurance Services Limited                                                       United Kingdom
Artscope International Insurance Services Limited                                         United Kingdom
Ascom Nijmegen B.V.                                                                       Netherlands
ASCOMIN S.A.                                                                              Belgium
Asesores Kennedy Agente de Seguros y de Fianzas, S.A. de C.V.                             Mexico
Asesores y Corredores De Seguros, S.A.                                                    Republica Dominica
Asharo bv                                                                                 Netherlands
Asia Area Underwriters Ltd.                                                               Hong Kong
Asian American Finance Limited                                                            Bermuda
Asian Reinsurance Underwriters Limited                                                    Hong Kong
Assekurazkontor fur Industrie und Verkehr GmbH                                            Germany
Assidoge Srl                                                                              Italy
Assistance Au Management Et A La Prevention Des Risques De L'Entreprise                   France
Associated Brokers International                                                          Zimbabwe
Associated Fund Adminstrators Botswana (Pty) Limited                                      Botswana

                                     - 12 -
<PAGE>
Associated Ins. Broker of Botswana                                                        Botswana
Associates Dealer Group of Bellevue, Washington, Inc.                                     Washington
Association of Real Estate and Real Estate Related Professionals                          Missouri
Association of Rural and Small Town Americans                                             Missouri
Assurance et Courtages Reunis pour la Gestion - ACR Gestion SAS                           France
Assurantie Groep Langeveldt c.v.                                                          Netherlands
ATJ Capital Forsakringsmakleri AB                                                         Sweden
Atkins Kroll Insurance Inc.                                                               Guam
Atlanta International Insurance Company                                                   New York
Attorneys' Advantage Insurance Agency, Inc.                                               Illinois
AUSCO, Inc.                                                                               Illinois
Auto Conduit Corporation, The                                                             Delaware
Auto Insurance Specialists - Bay Area, Inc.                                               California
Auto Insurance Specialists - Inland Empire, Inc.                                          California
Auto Insurance Specialists - Long Beach, Inc.                                             California
Auto Insurance Specialists - Los Angeles, Inc.                                            California
Auto Insurance Specialists - Newport, Inc.                                                California
Auto Insurance Specialists - San Gabriel Valley, Inc.                                     California
Auto Insurance Specialists - Santa Monica, Inc.                                           California
Auto Insurance Specialists - Valley, Inc.                                                 California
Auto Insurance Specialists, Incorporated                                                  California
Automotive Warranty Services of Florida, Inc.                                             Florida
Automotive Warranty Services, Inc.                                                        Delaware
AV Agrar Versicherungsdienst GmbH                                                         Germany
Ayala Aon Insurance Brokers, Inc.                                                         Philippines
Ayala-Bain Insurance Company                                                              Philippines
B E P International (Canada) Holding Inc.                                                 Canada
B E P International Corp.                                                                 New Jersey
B E P International Holding Inc.                                                          Canada
B E P International US Inc.                                                               Delaware
B.L. Carnie Hogg Robinson Ltd.                                                            United Kingdom
B.N. Shepp  Associates Ltd.                                                               Alberta
B.N.H. Group Ltd.                                                                         United Kingdom
B.V. Assurantiekantoor Langeveldt-Schroder                                                Netherlands
Bailiwick Consultancy & Management Co. Ltd.                                               Guernsey
Bain Clarkson (HK) Ltd.                                                                   Hong Kong
Bain Clarkson Consulting AB                                                               Sweden
Bain Clarkson Forsakringskonsult AB, Stockholm                                            Sweden
Bain Clarkson Limited                                                                     United Kingdom
Bain Clarkson Members Underwriting Agency Ltd.                                            United Kingdom
Bain Clarkson R.B. Ltd.                                                                   United Kingdom
Bain Clarkson Underwriting Management Ltd.                                                United Kingdom
Bain Dawes (London) Ltd.                                                                  United Kingdom
Bain Dawes Services Ltd.                                                                  United Kingdom
Bain Hogg Australia (Holdings) Ltd.                                                       Australia
Bain Hogg Australia Ltd.                                                                  Australia
Bain Hogg Chile S.A. Corredoros de Reasguro                                               Chile

                                     - 13 -
<PAGE>
Bain Hogg Colombiana Ltd.                                                                 Colombia
Bain Hogg Group Limited                                                                   United Kingdom
Bain Hogg Hellas Ltd.                                                                     United Kingdom
Bain Hogg Holdings Limited                                                                United Kingdom
Bain Hogg Insurance Management (Guernsey) Ltd.                                            Guernsey
Bain Hogg Insurance Management (Isle of Man) Ltd.                                         Isle of Man
Bain Hogg Intermediaro de Reaseguro SA de CV                                              Mexico
Bain Hogg International Holdings Ltd.                                                     United Kingdom
Bain Hogg International Ltd.                                                              United Kingdom
Bain Hogg Investments (Australia) Pty Ltd.                                                Australia
Bain Hogg Ltd.                                                                            United Kingdom
Bain Hogg Malawi Ltd.                                                                     Malawi
Bain Hogg Management Ltd.                                                                 United Kingdom
Bain Hogg Pensions Pty Ltd.                                                               Australia
Bain Hogg Robinson Pty Ltd.                                                               Australia
Bain Hogg Russian Insurance Brokers Ltd.                                                  Russia
Bain Hogg Trustees Ltd.                                                                   United Kingdom
Bain Hogg Uganda Ltd.                                                                     Uganda
Bain Insurance Brokers Kenya Ltd.                                                         Kenya
Banca Seguros Colon, S.A.                                                                 Colombia
Bankers Insurance Service Corp.                                                           Illinois
Barros & Carrion, Inc.                                                                    Puerto Rico
BEC Insurance Services Limited                                                            United Kingdom
Bekouw Mendes C.V.                                                                        Netherlands
Bekouw Mendes Reinsurance B.V.                                                            Netherlands
Bekouw Mendes Risk Management B.V.                                                        Netherlands
Bell Nicholson Henderson (Holdings) Ltd.                                                  United Kingdom
Bell Nicholson Henderson Ltd.                                                             United Kingdom
BenefitsMedia, Inc.                                                                       Tennessee
Benoit & Borg (Europe) Limited                                                            Ireland
Berkely Agency Ltd.                                                                       New York
Berkely Coverage Corporation                                                              New York
Berkely-ARM, Inc.                                                                         New York
BerkelyCare, LTD.                                                                         New York
BH No. 1 Ltd.                                                                             United Kingdom
BHR, Inc.                                                                                 Delaware
Black Portch & Swain (Financial Services) Ltd.                                            United Kingdom
Bloemers & Co. Herverzekering bv                                                          Netherlands
Blom & Van der Aa BV                                                                      Netherlands
Blom & Van der Aa Holding BV                                                              Netherlands
Boels & Begault France S.A.                                                               France
Boels & Begault Luxembourg S.a.r.l.                                                       Luxembourg
Boels & Begault Vlaanderen S.A.                                                           Belgium
Bonnor & Company A/S                                                                      Denmark
Bowes & Company, Inc., of New York                                                        New York
Bowes Holdings, Inc.                                                                      Illinois
Bowring and Minet (Swaziland) (Pty) Ltd.                                                  Swaziland

                                     - 14 -
<PAGE>
Brennan Group, Inc., The                                                                  Delaware
BRIC, Inc.                                                                                North Carolina
Brichetto Corretora de Seguros S/C Ltda                                                   Brazil
Brichetto Tecnica SA                                                                      Argentina
British Continental and Overseas Agencies (BCOA) SA                                       France
Broadgate Holdings Ltd.                                                                   United Kingdom
Brons Orobio Groep B.V.                                                                   Netherlands
Brons Van Lennep B.V.                                                                     Netherlands
Brons Van Lennep Den Haag B.V.                                                            Netherlands
Bruno Sforni S.p.A.                                                                       Italy
Bruns Ten Brink & Co. b.v.                                                                Netherlands
Bruns Ten Brink Herverzekeringen b.v.                                                     Netherlands
Bryson Associates Incorporated                                                            Pennsylvania
Bryson Associates Incorporated of Georgia                                                 Georgia
Budapest Pension Fund Company                                                             Hungary
Bureau d'Assurances Pirrotte GmbH                                                         Luxembourg
Bureau d'Assurances Pirrotte GmbH & Co. KG                                                Luxembourg
Burlington Insurance Services Ltd.                                                        United Kingdom
Burnie Enterprises Pty. Ltd.                                                              Papau New Guinea
Business Health Services, Inc.                                                            California
bv Algemeen Asurantiekantoor Schreinemacher                                               Netherlands
C A Robinson & Partners Ltd.                                                              United Kingdom
C.I.C. Realty, Inc.                                                                       Illinois
Cabinet Joos SARL                                                                         France
Caleb Brett Iberica, S.A.                                                                 Spain
California Group Services                                                                 California
Cambiaso Risso & Co. (Assicuriazioni Napoli)                                              Italy
Cambiaso Risso & Co. (Assicuriazioni) Srl                                                 Italy
Cambiaso Risso & Co. SA                                                                   Italy
Cambridge Galaher Settlements and Insurance Services, Inc.                                California
Cambridge Professional Liability Services, Inc.                                           Florida
Cambridge Professional Liability Services, Inc.                                           Illinois
Cambridge Professional Liability Services, Inc.                                           Pennsylvania
Cambridge Settlement Services, Inc.                                                       Minnesota
Camperdown 100 Limited                                                                    United Kingdom
Camperdown 101 Limited                                                                    United Kingdom
Cananwill Canada Limited                                                                  Ontario
Cananwill Corporation                                                                     Delaware
Cananwill Receivables Purchase Facility, L.L.C.                                           Delaware
Cananwill UK Limited                                                                      United Kingdom
Cananwill UK Limited                                                                      United Kingdom
Cananwill, Inc.                                                                           California
Cananwill, Inc.                                                                           Pennsylvania
CAP Managers Ltd.                                                                         Bermuda
Captive Assurance Partners                                                                California
Carstens & Schues GmbH & Co.                                                              Germany
Carstens & Schues Poland Ltd.                                                             Poland

                                     - 15 -
<PAGE>
Carstens & Schues Verwaltungs GmbH                                                        Germany
Catz & Lips B.V.                                                                          Netherlands
CCM McGrath Berrigan Ltd.                                                                 Ireland
CD Benefit, Inc.                                                                          Texas
CECAR - Compagnie Europeene de Courtage d'Assurances et de Reassurances SAe               France
CECAR Deutschland GmbH                                                                    Germany
CECAR Inchcape Asia Ltd.                                                                  Hong Kong
CECAR Portugal                                                                            Portugal
Celinvest Amsterdam bv                                                                    Netherlands
Central Technica SA                                                                       Spain
Centris Services Limited                                                                  United Kingdom
Centurion, Agente de Seguros, S.A. de C.V.                                                Mexico
Chemical & Oil Insurance Brokers (Pty) Ltd.                                               South Africa
Christopher Paul Insurance Services Ltd.                                                  United Kingdom
CIA Deutschland Kreditversicherungsmakler und Beratungs GmbH                              Germany
CIA Italia S.R.L.                                                                         Italy
CIA Link Ltd.                                                                             United Kingdom
CIA Supplier Finance Ltd.                                                                 United Kingdom
CIA USA Holdings, Inc.                                                                    Delaware
CICA Superannuation Nominees Pty. Ltd.                                                    Australia
CI-Erre Srl                                                                               Italy
Cinema Completions International, Inc.                                                    Delaware
Citadel Insurance Company                                                                 Texas
CJP, Inc.                                                                                 Delaware
Clarkson Bain Japan Ltd.                                                                  United Kingdom
Clarkson LMS Ltd.                                                                         United Kingdom
Clarkson Puckle Group, Ltd.                                                               United Kingdom
Clarkson Puckle Holdings Ltd.                                                             United Kingdom
Clarkson Puckle Ibex Ltd.                                                                 United Kingdom
Clarkson Puckle Ltd.                                                                      United Kingdom
Clarkson Puckle Overseas Holdings Ltd.                                                    United Kingdom
Clay & Partners (1987) Limited                                                            United Kingdom
Clay & Partners Independent Trust Corporation Ltd.                                        United Kingdom
Clay & Partners Ltd.                                                                      United Kingdom
Clay & Partners Pension Trustees Limited                                                  United Kingdom
Claytime Ltd.                                                                             United Kingdom
Clinton, Curtis, Melling Ltd.                                                             Ireland
CNL Nikols SA                                                                             Spain
Cogrup Correduria de Seguros, S.A.                                                        Spain
Cogrup, S.L.                                                                              Spain
Cole, Booth, Potter of New Jersey, Inc.                                                   New Jersey
Cole, Booth, Potter, Inc.                                                                 Pennsylvania
Columbia Automotive Services, Inc.                                                        Illinois
Combined Insurance Company de Argentina S.A. Compania de Seguros                          Argentina
Combined Insurance Company of America                                                     Illinois
Combined Insurance Company of Europe Limited                                              Ireland
Combined Insurance Company of New Zealand Limited                                         New Zealand

                                     - 16 -
<PAGE>
Combined Life Assurance Company Limited                                                   United Kingdom
Combined Life Assurance Company of Europe Limited                                         Ireland
Combined Life Insurance Company of Australia Limited                                      Australia
Combined Life Insurance Company of New York                                               New York
Combined Seguros Brasil S.A.                                                              Brazil
Combined Seguros Mexico, S.A. de C.V.                                                     Mexico
Commercial and Political Risk Consultants Ltd.                                            United Kingdom
Commercial Credit Corporation                                                             United Kingdom
Compagnie Franco-Belge d'Investissement et de Placement                                   Belgium
Compagnie Metropolotaine de Conseil - CMC SA                                              France
CompLogic, Inc.                                                                           Rhode Island
Compta Assur (SA)                                                                         France
Consultoria Vida y Pensiones S.A.                                                         Spain
Consumer Program Administrators, Inc.                                                     Illinois
Contract & Investment Recoveries Ltd.                                                     United Kingdom
Control de Riesgos, S.A.                                                                  Spain
Control y Global Services, S.A.                                                           Spain
Corks Bay & Fisher Ltd.                                                                   United Kingdom
Corks Bays & Fisher (Life & Pensions) Ltd.                                                United Kingdom
Corporacion Gil y Carvajal, SA                                                            Spain
Corporation Long Island CA                                                                Venezuela
Correduria de Seguros Gruppo Herrero, S.A.                                                Spain
CoSec 2000 Limited                                                                        United Kingdom
Coughlan General Insurances Limited                                                       Ireland
Couparey Nominees Limited                                                                 United Kingdom
Cranebox Ltd.                                                                             United Kingdom
Credit & Political Insurance Services Ltd.                                                United Kingdom
Credit & Political Risks Reinsurance Consultants Ltd.                                     United Kingdom
Credit Indemnity & Financial Services Ltd.                                                United Kingdom
Credit Insurance Research Unit Ltd.                                                       United Kingdom
CRiON nv                                                                                  Belgium
Crotty MacRedmond Insurance Limited                                                       Ireland
Custom Risk Solutions, LLC                                                                New Jersey
Customer Loyalty Institute, Inc.                                                          Michigan
cv 't Huys ter Merwe                                                                      Netherlands
CYARSA, Correduria de Reaseguros, S.A.                                                    Spain
CYARSA, Portugal, Correduria de Reaseguros, Ltda.                                         Portugal
D. Hudig & Co. b.v.                                                                       Netherlands
DA&A Insurance Agency, Inc.                                                               Texas
Dale Intermediaries Ltd. / Les Intermediaires Dale Ltee                                   Canada
Dale-Parizeau International Inc.                                                          Canada
Dale-Parizeau Management Ltd.                                                             Bermuda
Dealer Development Services, Ltd.                                                         United Kingdom
Deanborne Limited                                                                         United Kingdom
Denison Pension Trustees Ltd.                                                             United Kingdom
Diot Minet (France) SA                                                                    France
Dobson Park L. G. Limited                                                                 Guernsey

                                     - 17 -
<PAGE>
Document Risk Management Limited                                                          United Kingdom
Dominion Mutual Insurance Brokers Ltd.                                                    Canada
Dormante Holdings Limited                                                                 United Kingdom
Downes & Burke (Special Risks) Ltd.                                                       United Kingdom
Dreadnaught Insurance Company Limited                                                     Bermuda
Duggan Insurances Limited                                                                 Ireland
DUO AS                                                                                    Norway
Duoband Enterprises Ltd.                                                                  United Kingdom
DuPage Care Administrators, Inc.                                                          Illinois
E. Lillie & Co. Limited                                                                   United Kingdom
Eastaf Holdings Ltd.                                                                      United Kingdom
ECCO Insurance Services, Inc.                                                             Texas
Edward Lumley & Sons (Underwriting Agencies) Ltd.                                         United Kingdom
Elektrorisk Beheer bv                                                                     Netherlands
Elm Lane Limited                                                                          United Kingdom
Employee Benefit Communications, Inc.                                                     Florida
Energy Insurance Brokers & Risk Management Consultants Ltd.                               United Kingdom
ENTAB Insurance Services Ltd.                                                             United Kingdom
Entertainment Managers Insurance Agency of New York, Inc.                                 New York
Entertainment Managers Insurance Services, Inc.                                           Ontario
ERAS (International) Ltd.                                                                 United Kingdom
Ernest A. Notcutt & Co. Ltd.                                                              United Kingdom
Ernest A. Notcutt (Overseas) Ltd.                                                         United Kingdom
Ernest Notcutt Insurance Services Ltd.                                                    United Kingdom
Essar Insurance Consultants Ltd.                                                          Taiwan
Essar Insurance Services Ltd.                                                             Hong Kong
Europa Services Ltd.                                                                      Malta
Ewbar Limited                                                                             United Kingdom
ExcelNet (Guernsey) Ltd.                                                                  Guernsey
ExcelNet Ltd.                                                                             United Kingdom
Excess Corredores de Reaseguros SA                                                        Chile
Excess Underwriters Agency, Inc.                                                          New York
Excess Versicherungsagentur GmbH                                                          Germany
EXKO Excess Ruckversicherungs-AG                                                          Germany
EXKO Excess Versicherungsagentur GmbH                                                     Germany
Expatriate Consultancy Limited, The                                                       United Kingdom
Fabels-Versteeg b.v.                                                                      Netherlands
Far East Agency                                                                           Korea
Fides Alexander (A.G.) Switzerland                                                        Switzerland
Figurecheck Ltd.                                                                          United Kingdom
Finance Assurance Conseil - FAC SA                                                        France
Financial Solutions Insurance Services, Inc.                                              Illinois
Finsbury Healthcare Limited                                                               United Kingdom
Firma A.J.  Driessen C.V.                                                                 Netherlands
Forsakringsmaklarna Syd KB                                                                Sweden
France Cote D'Afrique                                                                     France
France Fenwick Limited                                                                    United Kingdom

                                     - 18 -
<PAGE>
Frank B. Hall & Co. (N.S.W.) Pty. Ltd.                                                    Australia
Frank B. Hall & Co. Holdings (N.Z.) Limited                                               New Zealand
Frank B. Hall (Ireland) Limited                                                           Ireland
Frank B. Hall (Reinsurance) France S.A.                                                   France
Frank B. Hall (Underwriting Managers) Ltd.                                                Bermuda
Frank B. Hall (United Kingdom) Limited                                                    United Kingdom
Frank B. Hall Insurance Brokers (S) Pte. Ltd.                                             Singapore
Frank B. Hall Re (Latin America) Inc.                                                     Panama
FS Insurance Agency of California, Inc.                                                   California
FS Insurance Agency, Inc.                                                                 Ohio
G&C Venezuela. S.A.                                                                       Venezuela
Galaher Settlements Company of New York, Inc.                                             New York
Garantie Europeene de Publication S.A.                                                    France
Gardner Mountain Financial Services Ltd.                                                  United Kingdom
Gardner Mountain Trustees Ltd.                                                            United Kingdom
Gateway Alternatives, L.L.C.                                                              Delaware
Gateway Insurance Company, Ltd.                                                           Bermuda
General Service Srl                                                                       Italy
Gestas (1995) Inc.                                                                        Canada
Giesy, Greer & Gunn, Inc.                                                                 Oregon
Gil y Carvajal - Consultores, Lda.                                                        Portugal
Gil y Carvajal Chile Ltda., Corredores de Seguros                                         Chile
Gil y Carvajal Consultores, S.A.                                                          Spain
Gil y Carvajal Correduria de Seguros, SA                                                  Spain
Gil y Carvajal Global Services S.A.                                                       Spain
Gil y Carvajal Iberoamerica, S.A.                                                         Spain
Gil y Carvajal Iberoamerica, SA                                                           Peru
Gil y Carvajal S.A. Corredores de Seguros                                                 Colombia
Gil y Carvajal Seguros, SA                                                                Spain
Gil y Carvajal UK Ltd.                                                                    United Kingdom
Gil y Carvajal, S.A. Vida y Pensiones                                                     Spain
Gilman Swire Willis Ltd.                                                                  Hong Kong
Gilroy Broome & Scrini (Trustees) Ltd.                                                    United Kingdom
Global Entertainment & Media Insurance Agency, L.L.C.                                     Illinois
Go Pro Agency, Inc. of San Antonio                                                        Texas
Go Pro Life Agency, Inc. of San Antonio                                                   Texas
Go Pro Underwriting Managers of Virginia, Inc.                                            Virginia
Go Pro Underwriting Managers, Inc.                                                        Texas
Godwins Limited                                                                           United Kingdom
Gotuaco del Rosario & Associates, Inc.                                                    Philippines
Gras Savoye Rumania                                                                       Romania
Greville Baylis Parry & Associates Ltd.                                                   United Kingdom
Greyfriars Marketing Services Pty Ltd.                                                    Australia
Group Le Blanc de Nicolay SA                                                              France
Groupement Europeen d'Assurances Generales                                                France
Growth Enterprises Ltd.                                                                   Bahamas
Guardrisk Insurance Company Limited                                                       South Africa

                                     - 19 -
<PAGE>
Guernsey Nominees (Pty) Limited                                                           Guernsey
Gwelforth Ltd.                                                                            United Kingdom
H.A.R.B. Ltd.                                                                             United Kingdom
H.L. Puckle (Underwriting) Ltd.                                                           United Kingdom
Hadenmead Limited                                                                         United Kingdom
Halford, Shead & Co. Limited                                                              United Kingdom
Hall & Company (Overseas) Ltd.                                                            United Kingdom
Hall & Company (UK) Ltd.                                                                  United Kingdom
Hamburger Gesellschaft zur Forderung des Versicherungswesen mbH                           Germany
Hamburger Ruckversicherungs - Agentur GmbH                                                Germany
Hans R Schmidt Gmbh                                                                       Germany
Hanse Assekuranz-Vermittlungs GmbH                                                        Germany
Hanseatische Assekuranz Kontor GmbH                                                       Germany
Hanseatische Assekuranz Vermittlungs AG                                                   Germany
Harbour Pacific  Holdings Pty., Ltd.                                                      Australia
Harbour Pacific Underwriting Management Pty Limited                                       Australia
Heath Hudig Langeveldt Sdn. Bhd.                                                          Malaysia
Heerkens Thijsen Groep bv                                                                 Netherlands
Heerkens Thijssen & Co. bv                                                                Netherlands
Heerkens Thijssen Caviet vof                                                              Netherlands
Heiland Versicherungs-Service GmbH                                                        Germany
Heli Agency                                                                               Korea
Hemisphere Marine & General Assurance Ltd.                                                Bermuda
HHL (Taiwan) Ltd.                                                                         Taiwan
HHL Reinsurance Brokers Inc.                                                              Philippines
HHL Reinsurance Brokers Pte. Ltd.                                                         Singapore
HHL Reinsurance Services Sdn. Bhd.                                                        Malaysia
Highplain Limited                                                                         United Kingdom
Hobbs & Partners Ltd.                                                                     United Kingdom
Hogg Automotive Insurance Services Ltd.                                                   United Kingdom
Hogg Group Overseas Ltd.                                                                  United Kingdom
Hogg Group plc                                                                            United Kingdom
Hogg Robinson & Gardner Mountain (Insurance) Ltd.                                         United Kingdom
Hogg Robinson (Nigeria) Unlimited                                                         Nigeria
Hogg Robinson (Scotland) Ltd.                                                             Scotland
Hogg Robinson Holdings (Pty) Ltd.                                                         South Africa
Hogg Robinson North America, Inc.                                                         Delaware
Hogg Robinson Services (Kenya) Ltd.                                                       Kenya
Horwitch Insurance Agency, Inc.                                                           Illinois
Howden Cover Hispanoamericana (Bermuda) Ltd.                                              Bermuda
Howden Dastur Reinsurance Brokers (Private) Ltd.                                          India
Howden Management & Data Services Ltd.                                                    United Kingdom
Howden Sterling Asia Limited                                                              Hong Kong
Howell King & Company Ltd.                                                                United Kingdom
HRGM 1989 Ltd.                                                                            United Kingdom
HRGM Cargo Ltd.                                                                           United Kingdom
HRGM Ltd.                                                                                 United Kingdom

                                     - 20 -
<PAGE>
HRGM Management Services Ltd.                                                             United Kingdom
HRGM Marine Ltd.                                                                          United Kingdom
HRS EDV Systemhaus GmbH                                                                   Germany
Hudig Langeveldt Pte Ltd.                                                                 Singapore
Hudig-Langeveldt (Pensioenbureau) bv                                                      Netherlands
Hudig-Langeveldt (Reinsurance) bv                                                         Netherlands
Hudig-Langeveldt Coens N.V.                                                               Belgium
Hudig-Langeveldt Janson Elffers B.V.                                                      Netherlands
Hudig-Langeveldt Kyoritsu Ltd.                                                            Japan
Hudig-Langeveldt Makelaardij in Assurantien bv                                            Netherlands
Hudig-Langeveldt Saat B.V.                                                                Netherlands
Human Relations Strategies Limited                                                        United Kingdom
Huntington T. Block Insurance Agency, Inc.                                                District of Columbia
Huntington T. Block Insurance Agency, Inc.                                                Ohio
Hydrocarbon Risk Consultants Ltd.                                                         United Kingdom
Ian H. Graham, Inc.                                                                       California
Ibex Managers Ltd.                                                                        Kenya
ICR-Riass Srl                                                                             Italy
Impact Forecasting Limited                                                                United Kingdom
Impact Forecasting, L.L.C.                                                                Illinois
Inchcape Continental Insurance Holdings (Eastern Europe) Ltd.                             Cyprus
Inchcape Continental Insurance Holdings BV                                                Netherlands
Inchcape H.R. (Asia) Ltd.                                                                 Hong Kong
Inchcape Insurance Agencies (HK) LTd.                                                     Hong Kong
Inchcape Insurance Agencies Pte Ltd.                                                      Singapore
Inchcape Insurance Brokers (HK) Ltd.                                                      Hong Kong
Inchcape Insurance Brokers (M) Sdn Bhd                                                    Malaysia
Inchcape Insurance Holdings (HK) Ltd.                                                     Hong Kong
Indemnity Insurance Services (Pty) Limited                                                South Africa
Industrie Assekuranz Gmbh                                                                 Germany
Inmobiliaria Ramos Rosada, S.A. de C.V.                                                   Mexico
Innovative Services International Limited                                                 United Kingdom
Innovative Services International, L.L.C.                                                 Delaware
Insurance Administrators, Inc.                                                            Texas
Insurance Brokers Service, Inc.                                                           Illinois
Insurance Broking Services (Pty) Limited                                                  Guernsey
Insurance Holdings Africa Ltd.                                                            Kenya
Insurance Planning, Inc.                                                                  Nevada
Insurance Underwriters Agency, Inc.                                                       Arizona
Integrated Risk Finance Limited                                                           United Kingdom
Integrated Risk Finance Limited                                                           United Kingdom
Integrated Risk Resources Limited                                                         United Kingdom
Integrated Risk Resources Limited                                                         United Kingdom
Interbroke Ltd.                                                                           Switzerland
Interglobe Management AG                                                                  Switzerland
Interims Limited                                                                          United Kingdom
International Aviation Brokers SA                                                         France

                                     - 21 -
<PAGE>
International Film Finance Limited Partnership                                            United Kingdom
International Industrial Insurances Limited                                               Ireland
International Insurance Brokers Ltd.                                                      Jamaica
International Shipowners Mutual Insurance Association Limited                             Bermuda
International Space Brokers Inc.                                                          Virginia
Interocean (Italia) S.p.A.                                                                Italy
Interocean Reinsurance Company, S.A.                                                      Panama
Investment Facility Company Four One Two (Pty) Ltd.                                       South Africa
Investment Insurance International (Managers) Ltd.                                        United Kingdom
IOC Reinsurance Brokers Ltd.                                                              Canada
IRBJ Disposition Company                                                                  United Kingdom
IRISC Claims Management Limited                                                           United Kingdom
IRISC Specialty, Inc.                                                                     Delaware
IRM France S.A.                                                                           France
ISPP Purchasing Group                                                                     Missouri
ITA Insurance, Inc.                                                                       Utah
ItalCECAR S.p.A.                                                                          Italy
J H  Minet (Insurance) Ltd.                                                               Ireland
J H Minet (Inter-Gremium) AG                                                              Switzerland
J H Minet Agencies Ltd.                                                                   United Kingdom
J H Minet Puerto Rico Inc.                                                                Puerto Rico
J H Minet Reinsurance Services Limited                                                    United Kingdom
J&H Risk Management Consultants GmbH                                                      Germany
J&H Unison Holdings BV                                                                    Netherlands
J&H Vorsorgefonds                                                                         Switzerland
J.H. Blades & Co. (Agency), Inc.                                                          Texas
J.H. Blades & Co., Inc.                                                                   Texas
J.H. Blades Insurance Services                                                            California
J.S. Johnson & Co. Ltd.                                                                   Bahamas
James S. Kemper & Co. International Ltd.                                                  Bermuda
Jaspers Industrie Assekuranz GmbH & Co. KG                                                Germany
Jauch & Hubener (KG)                                                                      Austria
Jauch & Hubener AG                                                                        Switzerland
Jauch & Hubener Beratungs AG                                                              Switzerland
Jauch & Hubener CSFR Spol s.r.o.                                                          Slovak Republic
Jauch & Hubener d.o.o.                                                                    Slovak Republic
Jauch & Hubener Ges. m.b.H.                                                               Austria
Jauch & Hubener GmbH                                                                      Austria
Jauch & Hubener Kft.                                                                      Hungary
Jauch & Hubener Management betriebliche Versorgungen                                      Germany
Jauch & Hubener Personalvorsorgestiftung                                                  Switzerland
Jauch & Hubener Reinsurance Inter. Services of North America                              New Jersey
Jauch & Hubener Reinsurance Services Ltd.                                                 United Kingdom
Jauch & Hubener Ruckversicherungs-Vermittlungsges mbH                                     Germany
Jauch & Hubener spol sro                                                                  Czech Republic
Jenner Fenton Slade (Special Risks) Limited                                               United Kingdom
Jenner Fenton Slade Group Limited                                                         United Kingdom

                                     - 22 -
<PAGE>
Jenner Fenton Slade Limited                                                               United Kingdom
Jenner Fenton Slade Political Risks Limited                                               United Kingdom
Jenner Fenton Slade Reinsurance Services Limited                                          United Kingdom
Jenner Fenton Slade Surety and Specie Limited                                             United Kingdom
JFC Consulting, Inc.                                                                      Delaware
JFS (Sudamerica) SA                                                                       Uruguay
JFS Fenchurch Limited                                                                     United Kingdom
JFS Greig Fester Limited                                                                  United Kingdom
JML-Minet A.G.                                                                            Switzerland
John C. Lloyd Reinsurance Brokers Ltd.                                                    Australia
John Scott Insurance Brokers Limited                                                      United Kingdom
Johnson & Higgins PB Co.                                                                  Thailand
Johnson Rooney Welch, Inc.                                                                California
Joost & Preuss GmbH                                                                       Germany
Joseph U. Moore, Inc.                                                                     Florida
Jover Prevision Correduria de Seguros                                                     Spain
K & K Insurance Brokers, Inc. Canada                                                      Ontario
K & K Insurance Group of Florida, Inc.                                                    Florida
K & K Insurance Group, Inc.                                                               Indiana
K & K Insurance Specialties, Inc.                                                         Indiana
K & K of California Insurance Services, Inc.                                              California
K & K of Nevada, Inc.                                                                     Nevada
Karl Alt & Co. GmbH                                                                       Germany
Keeling Insurance Services                                                                California
Keith Rayment & Associates Ltd.                                                           United Kingdom
Keyaction Ltd.                                                                            United Kingdom
Kininmonth Limited                                                                        Ireland
Kroller Holdings B.V.                                                                     Netherlands
L & G LMX Limited                                                                         United Kingdom
L. & F. Longobardi SRL                                                                    Italy
La Societe de Courtage Meloche Alexander Inc.                                             Canada
Langeveldt de Vos b.v.                                                                    Netherlands
Langeveldt Groep B.V.                                                                     Netherlands
Laurila, Kauriala & Grig Ltd.                                                             Russia
Laverack & Haines, Inc.                                                                   New York
LBN Asia International Reinsurance Brokers Pte Ltd.                                       Singapore
Le Blanc de Nicolay Asia                                                                  Hong Kong
Le Blanc de Nicolay Courtage SA                                                           France
Le Blanc de Nicolay Iberica                                                               Spain
Le Blanc de Nicolay Reassurances SA                                                       France
Le Blanc de Nicolay Riassicurazione                                                       Italy
Le Blanc de Nicolay Ruckversicherungsmakler GmbH                                          Germany
Le Blanc de Nicolay U.S., Inc.                                                            Delaware
Le Blanc de Nicolay Zurich                                                                Switzerland
Lescorp Limited                                                                           United Kingdom
Leslie & Godwin (C.I.) Limited                                                            Guernsey
Leslie & Godwin (Reinsurance) Copenhagen A/S                                              Denmark

                                     - 23 -
<PAGE>
Leslie & Godwin (Scotland) Limited                                                        Scotland
Leslie & Godwin (U.K.) Limited                                                            United Kingdom
Leslie & Godwin (WFG) Limited                                                             United Kingdom
Leslie & Godwin Aviation Holdings Limited                                                 United Kingdom
Leslie & Godwin Aviation Limited                                                          United Kingdom
Leslie & Godwin Aviation Reinsurance Services Limited                                     United Kingdom
Leslie & Godwin AXL Limited                                                               United Kingdom
Leslie & Godwin Financial Risks Limited                                                   United Kingdom
Leslie & Godwin GmbH                                                                      Germany
Leslie & Godwin Group Limited                                                             United Kingdom
Leslie & Godwin Insurance Brokers Ltd.                                                    Ontario
Leslie & Godwin Insurance Brokers, Inc.                                                   New York
Leslie & Godwin International Limited                                                     United Kingdom
Leslie & Godwin Investments Limited                                                       United Kingdom
Leslie & Godwin Limited                                                                   United Kingdom
Leslie & Godwin Marine Holdings Limited                                                   United Kingdom
Leslie & Godwin Non-Marine Limited                                                        United Kingdom
Leslie & Godwin Overseas Reinsurance Holdings Limited                                     United Kingdom
Leslie & Godwin Reinsurance Holdings Limited                                              United Kingdom
LIB Financial Services Ltd.                                                               United Kingdom
LIB Ltd.                                                                                  United Kingdom
Litigation Risk Management Limited                                                        United Kingdom
London General Holdings Limited                                                           United Kingdom
London General Insurance Company Limited                                                  United Kingdom
Lowndes Lambert Insurance Limited                                                         Ireland
Lumley Insurance Brokers (Pty) Ltd.                                                       South Africa
Lumley JFS Limited                                                                        United Kingdom
Lumley Municipal & General Insurance Brokers (Natal) (Pty) Ltd.                           South Africa
Lumley Municipal & General Insurance Brokers (Orange Free State) (Pty) Ltd.               South Africa
Lumley Municipal & General Insurance Brokers (Pty) Ltd.                                   South Africa
Lumley Municipal & General Insurance Brokers (Transvaal) (Pty) Ltd.                       South Africa
Lumley Petro-Energy Insurance Brokers (Pty) Ltd.                                          South Africa
M Y A Ltda. Asesorias Integrales                                                          Colombia
M Y A Salud Ltda Agentes De Medicina Prepagada                                            Colombia
M.I. B. Healthcare Services (Pty) Limited                                                 South Africa
M.I.B. Aidec (Pty) Limited                                                                South Africa
M.I.B. Border (Pty) Limited                                                               South Africa
M.I.B. Employee Benefits (Pty) Limited                                                    South Africa
M.I.B. Group (Pty) Limited                                                                South Africa
M.I.B. House Investment (Pty) Limited                                                     South Africa
M.I.B. Property Holdings (Pty) Limited                                                    South Africa
M.I.B. Reinsurance Brokers (Namibia) (Pty) Limited                                        Namibia
M.I.B. Reinsurance Brokers (Pty) Limited                                                  South Africa
MAB Insurance Services Ltd.                                                               United Kingdom
MacDonagh & Boland Group Limited                                                          Ireland
MacDonagh Boland Beech Hill Limited                                                       Ireland
MacDonagh Boland Crotty MacRedmond Limited                                                Ireland

                                     - 24 -
<PAGE>
MacDonagh Boland Cullen Duggan Limited                                                    Ireland
MacDonagh Boland Foley Woollam Limited                                                    Ireland
Macey Clifton Walters Limited                                                             United Kingdom
Macey Williams Insurance Services Limited                                                 United Kingdom
Macey Williams Limited                                                                    United Kingdom
Madison Intermediaries Pty. Limited                                                       Australia
Mahamy Company plc (Aon Iran)                                                             Iran
Management and Regulator Services, Inc.                                                   New York
Mansell Investments Ltd.                                                                  Gibraltar
Mansfeld, Hubener & Partners Gmbh                                                         Germany
Marinaro Dundas SA                                                                        Argentina
Marinaro Dundas SA                                                                        Uruguay
Maritime Underwriters, Ltd.                                                               Bermuda
Martec Australia Pty Limited                                                              Australia
Martec Finance Pty Limited                                                                Australia
Martin Boyer Company, Inc.                                                                Illinois
Marvyn Hughes International Ltd.                                                          United Kingdom
Max Mattiessen AB                                                                         Sweden
MC Brokers Co. Ltd.                                                                       Thailand
Media/Professional Insurance Agency Limited                                               United Kingdom
Media/Professional Insurance Agency, Inc.                                                 Missouri
Mediterranean Insurance Brokers Ltd.                                                      Malta
Mediterranean Insurance Training Centre                                                   Malta
MEIE Argentina SA                                                                         Argentina
MIB UK (Holdings) Ltd.                                                                    United Kingdom
Mibsa Investments (Namibia) (Pty) Limited                                                 Namibia
Minahan Reinsurance Management Limited                                                    United Kingdom
Minerva Holdings (Pvt) Limited                                                            Zimbabwe
Minet (Taiwan) Ltd.                                                                       Taiwan
Minet a.s.                                                                                Czech Republic
Minet Africa Holdings Ltd.                                                                United Kingdom
Minet Airport Insurance Services Ltd.                                                     United Kingdom
Minet AS                                                                                  Norway
Minet Australia Holdings Ltd.                                                             Australia
Minet Australia Ltd.                                                                      Australia
Minet Benefit Services (International) Ltd.                                               Guernsey
Minet Botswana (Pty) Ltd.                                                                 Botswana
Minet Burn & Roche Pty. Ltd.                                                              Australia
Minet China Ltd.                                                                          Hong Kong
Minet Commercial Ltd.                                                                     United Kingdom
Minet Consultancy Services Ltd. (Kenya)                                                   Kenya
Minet Consultancy Services Ltd. (UK)                                                      United Kingdom
Minet Denison Financial Services Ltd.                                                     United Kingdom
Minet Denison Insurance Services Ltd.                                                     United Kingdom
Minet Direct Marketing Services Ltd.                                                      United Kingdom
Minet Duncan Insurance Brokers Ltd.                                                       United Kingdom
Minet Employees' Trust Company Ltd.                                                       United Kingdom

                                     - 25 -
<PAGE>
Minet Europe Holdings Ltd.                                                                United Kingdom
Minet Financial Services Ltd.                                                             United Kingdom
Minet Firstbrokers Oy                                                                     Finland
Minet Group                                                                               United Kingdom
Minet Group Holdings                                                                      United Kingdom
Minet Group Services Ltd.                                                                 United Kingdom
Minet Holdings Guernsey Limited                                                           Guernsey
Minet Holdings Inc.                                                                       New York
Minet Hong Kong Ltd.                                                                      Hong Kong
Minet ICDC Insurance Brokers Ltd.                                                         Kenya
Minet Inc. (Canada)                                                                       Canada
Minet Ins. Brokers (Holdings) (NZ) Ltd.                                                   New Zealand
Minet Ins. Brokers (Zimbabwe) (Pvt) Ltd.                                                  Zimbabwe
Minet Insurance Brokers (Holdings) Ltd.                                                   United Kingdom
Minet Insurance Brokers (Thailand) Ltd                                                    Thailand
Minet Insurance Brokers (Uganda) Limited                                                  Uganda
Minet Insurance Services (UK) Ltd.                                                        United Kingdom
Minet International (Holdings) Ltd.                                                       United Kingdom
Minet Kingsway (Lesotho) (Pty) Ltd.                                                       Lesotho
Minet Limited                                                                             Uganda
Minet Limited (Bermuda)                                                                   Bermuda
Minet Lindgren i Helsingborg                                                              Sweden
Minet Ltd.                                                                                United Kingdom
Minet Members Agency Holdings Ltd.                                                        United Kingdom
Minet New Zealand Ltd.                                                                    New Zealand
Minet Nigeria                                                                             Nigeria
Minet Nominees Ltd.                                                                       United Kingdom
Minet Professional Services (Europe) Ltd.                                                 United Kingdom
Minet Professional Services Ltd. (Australia)                                              Australia
Minet Professional Services Ltd. (UK)                                                     United Kingdom
Minet Properties (1989) Ltd.                                                              United Kingdom
Minet Properties Ltd.                                                                     United Kingdom
Minet RAIA Insurance Brokers Limited                                                      Hong Kong
Minet Re (Bermuda) Limited                                                                Bermuda
Minet Re GmbH                                                                             Germany
Minet Re International Ltd.                                                               United Kingdom
Minet Re North America, Inc.                                                              Georgia
Minet Risk Services (Barbados) Ltd.                                                       Barbados
Minet Risk Services (Bermuda) Ltd.                                                        Bermuda
Minet Risk Services (Guernsey) Ltd.                                                       Guernsey
Minet Risk Services (Jersey) Ltd.                                                         Jersey, Channel Islands
Minet Risk Services (Singapore) Ltd.                                                      Singapore
Minet S.A. de C.V.                                                                        Mexico
Minet Singapore Pte. Ltd.                                                                 Singapore
Minet Trans Risk Services Ltd.                                                            United Kingdom
Minet Trustees Ltd.                                                                       United Kingdom
Minet West Africa Ltd.                                                                    United Kingdom

                                     - 26 -
<PAGE>
Minet Zambia Limited                                                                      Zambia
Minet Zimbabwe (Pvt) Ltd.                                                                 Zimbabwe
Minken Properties Ltd.                                                                    Kenya
MLH International Inc.                                                                    Ontario
Moes & Caviet Last bv                                                                     Netherlands
Morency, Weible & Sapa, Inc.                                                              Illinois
Motorplan Limited                                                                         United Kingdom
Mt. Franklin General Agency                                                               Texas
MTF Insurance Agency, Inc.                                                                Texas
Muirfield Underwriters, Ltd.                                                              Delaware
N.V. Verzekering Maatschappij Van 1890                                                    Netherlands
National Product Care Company                                                             Illinois
National Transportation Adjusters, Inc.                                                   Nebraska
NB Life Agents, Inc.                                                                      New York
Needler Heath (UK) Ltd.                                                                   United Kingdom
Needler Heath Dixon Ltd.                                                                  United Kingdom
Netherlands Construction Insurance Services Ltd                                           United Kingdom
New Co. #1 L.L.C.                                                                         Delaware
Nicholson Chamberlain Colls Australia Limited                                             Australia
Nicholson Chamberlain Colls Group Limited                                                 United Kingdom
Nicholson Chamberlain Colls Marine Limited                                                United Kingdom
Nicholson Jenner Leslie Group Limited                                                     United Kingdom
Nicholson Leslie (North America) Limited                                                  United Kingdom
Nicholson Leslie Accident & Health Limited                                                United Kingdom
Nicholson Leslie Agencies Limited                                                         United Kingdom
Nicholson Leslie Asia Pte Ltd                                                             Singapore
Nicholson Leslie Australia Holdings Limited                                               Australia
Nicholson Leslie Aviation Limited                                                         United Kingdom
Nicholson Leslie Aviation Reinsurance Brokers                                             United Kingdom
Nicholson Leslie BankAssure Limited                                                       United Kingdom
Nicholson Leslie Bankscope Insurance Services Limited                                     United Kingdom
Nicholson Leslie Bankscope Marine Insurance Consultants                                   United Kingdom
Nicholson Leslie Energy Resources Limited                                                 United Kingdom
Nicholson Leslie Financial Institutions Limited                                           United Kingdom
Nicholson Leslie International  (Reinsurance Brokers) Limited                             United Kingdom
Nicholson Leslie International Limited                                                    United Kingdom
Nicholson Leslie Italia S.P.A.                                                            Italy
Nicholson Leslie Limited                                                                  United Kingdom
Nicholson Leslie Management Services Limited                                              United Kingdom
Nicholson Leslie Marine Limited                                                           United Kingdom
Nicholson Leslie Nederland Reinsurance brokers cv                                         Netherlands
Nicholson Leslie Non-Marine Reinsurance Brokers Limited                                   United Kingdom
Nicholson Leslie North American Reinsurance Brokers, Limited                              United Kingdom
Nicholson Leslie Property Limited                                                         United Kingdom
Nicholson Leslie Special Risks Limited                                                    United Kingdom
Nicholson Stewart-Brown Limited                                                           United Kingdom
Nikols Chile SA                                                                           Chile

                                     - 27 -
<PAGE>
Nikols Galicia SA                                                                         Spain
Nikols Iberia SA                                                                          Spain
Nikols International Ltd.                                                                 Brit. Virgin Islands
Nikols Portugal Ltda                                                                      Portugal
Nikols SA                                                                                 Switzerland
Nikols Segiber Ltda                                                                       Portugal
Nissho Iwai (Japan)                                                                       Japan
Nixon Constable & Company Ltd.                                                            United Kingdom
Norsk Forsikringsservice AS                                                               Norway
North Derbyshire Finance Company Limited, The                                             United Kingdom
Norwegian Insurance Partners A/S                                                          Norway
Norwegian Insurance Partners as (Non-Marine)                                              Norway
NRC Reinsurance Company Ltd.                                                              Bermuda
nv Insurance Louis Delhaize (en abrege INSURDEL)                                          Belgium
Ohio Cap Insurance Company, Inc.                                                          Bermuda
OHM Insurance Agency, Inc.                                                                Ohio
OHM Services of Texas, Inc.                                                               Texas
Ohrinsoo Agency                                                                           Korea
Olarescu & B. I. Davis Asesores y Corredores de Seguros S.A.                              Peru
Old ARS LRA Corp.                                                                         Texas
Old S&C of PA, Inc.                                                                       Pennsylvania
Olympic Financial Holding Corporation                                                     Washington
Olympic Health Management Services, Inc.                                                  Washington
Olympic Health Management Systems, Inc.                                                   Washington
Orobio Mees Herman B.V.                                                                   Netherlands
OUM & Associates of New York, A Corporation                                               New York
OUM & Associates of Ohio, A Corporation                                                   Ohio
OWA Hoken (UK) Limited                                                                    United Kingdom
OWA Insurance Services Austria Gesellschaft mbH                                           Austria
OWA Insurance Services Austria GmbH & Co. KG                                              Austria
P I Insurance Brokers (Pty) Limited                                                       South Africa
P.I. Consultants Ltd.                                                                     Hong Kong
P.T. Alexander Lippo Indonesia                                                            Indonesia
Pacific Wholesale Insurance Brokers Pty Limited                                           Australia
Paladin Reinsurance Corporation                                                           New York
Pandimar Consultants, Inc.                                                                New York
Paribas Assurantien B.V.                                                                  Netherlands
Parker Risk Management (Barbados) Ltd.                                                    Barbados
Parker Risk Management (Bermuda) Ltd.                                                     Bermuda
Parker Risk Management (Cayman) Ltd.                                                      Cayman Islands
Parker Risk Management (Guernsey) Ltd.                                                    Guernsey
Parker Risk Management (S) Pte Ltd                                                        Singapore
Pat Ryan & Associates, B.V.                                                               Netherlands
Paul J.F. Schultz oHG                                                                     Germany
PBG Pensions Beratungs-Gesellschaft mbH (Partnership)                                     Germany
Pernas HHL Insurance Brokers Sdn Bhd                                                      Malaysia
Pernas HHL Reinsurance Brokers Sdn. Bhd.                                                  Malaysia

                                     - 28 -
<PAGE>
PHH Insurance Associates Corporation                                                      Maryland
Pinerich Limited                                                                          Ireland
PL Ferrari & Co International Srl                                                         Italy
Plaire SA                                                                                 France
Poland Puckle Insurance Brokers Ltd.                                                      United Kingdom
Premier Auto Finance, Inc.                                                                Delaware
Premier Auto Finance, L.P.                                                                Illinois
Premier Receivables Purchase Facility, LLC                                                Delaware
Prescot Insurance Holdings Ltd.                                                           United Kingdom
Presidium Companies, Inc.                                                                 Delaware
Presidium Holdings, Inc.                                                                  Delaware
Presidium, Inc.                                                                           Delaware
Private Client Trustees Ltd.                                                              Ireland
Product Care, Inc.                                                                        Illinois
Produgar                                                                                  Portugal
Professional & General Ins. Company (Bermuda) Ltd.                                        Bermuda
Professional Liability Services Limited                                                   United Kingdom
Professional Sports Insurance Co. Ltd.                                                    Bermuda
Progressive Ideal Sdn Bhd.                                                                Malaysia
Promotora Zircon S.A. de C.V.                                                             Mexico
Property Owners Database Limited                                                          United Kingdom
Proruck Ruckversicherungs - AG                                                            Germany
PROVIA Gesselschaft fur betriebliche Risicoanalyse mbH                                    Germany
Provider Services, Ltd.                                                                   Bermuda
PT RNJ Ratna Nusa Jaya                                                                    Indonesia
PYXYS-Gestion de Flottes SA                                                               France
R&M Reinsurance Intermediaries Ltd.                                                       Trinidad
R.E.I. (NSW) Insurance Brokers Pty. Ltd.                                                  Australia
R.E.I.A. Insurance Brokers Pty. Ltd.                                                      Australia
R.G. Reis (Management Services) Ltd.                                                      United Kingdom
R.G. Reis Pension Fund Trustees Ltd.                                                      United Kingdom
Ralph S. Harris (Insurance) Pty. Ltd.                                                     Zimbabwe
RAMRO y Asociados, S.C.                                                                   Mexico
Rath & Strong, Inc.                                                                       Massachusetts
RBH General Agencies (Canada) Inc.                                                        Quebec
RDG Resource Dealer Group (Canada) Inc.                                                   Canada
RDG Securities Corporation                                                                Illinois
Reed Stenhouse Asia Pacific Ltd.                                                          Scotland
Reed Stenhouse Europe Holdings B.V.                                                       Netherlands
Reed Stenhouse Gmbh                                                                       Germany
Reed Stenhouse Netherlands B.V.                                                           Netherlands
Reed Stenhouse Underwriting Management Ltd.                                               Scotland
REISA Insurance Brokers Pty. Ltd.                                                         Australia
REIV Insurance Brokers (Pty) Ltd.                                                         Australia
Reserv Corporation                                                                        Pennsylvania
Resource Acquisition Corporation                                                          Delaware
Resource Dealer Group of Alabama, Inc.                                                    Alabama

                                     - 29 -
<PAGE>
Resource Dealer Group of Arizona Insurance Services, Inc.                                 Arizona
Resource Dealer Group of Indiana, Inc.                                                    Indiana
Resource Dealer Group of Kentucky, Inc.                                                   Kentucky
Resource Dealer Group of Massachusetts Insurance Agency, Inc.                             Massachusetts
Resource Dealer Group of Mississippi, P.A.                                                Mississippi
Resource Dealer Group of Nevada, Inc.                                                     Nevada
Resource Dealer Group of New Mexico, Inc.                                                 New Mexico
Resource Dealer Group of Ohio Agency, Inc.                                                Ohio
Resource Dealer Group of Texas, Inc.                                                      Texas
Resource Dealer Group, Inc.                                                               Illinois
Resource Dealer Group, Inc.                                                               Mississippi
Resource Dealer Insurance Services of California, Inc.                                    California
Resource Financial Corporation                                                            Delaware
Resource Life Insurance Company                                                           Illinois
Resource Training, Inc.                                                                   Illinois
Revasa S.p.A.                                                                             Italy
RHH Surety & Guarantee Limited                                                            United Kingdom
RIP Services Limited                                                                      Guernsey
Risk Funding Services (Pty) Limited                                                       South Africa
Risk Management Consultants Ltd.                                                          United Kingdom
Risk Management Consultants of Canada Limited                                             Canada
RiskNet Worldwide, Inc.                                                                   Oregon
Risque et Finance SA                                                                      France
Rockford Holding, Inc.                                                                    Delaware
Rockford Life Insurance Company                                                           Arizona
Rollins Heath (Japan) Ltd.                                                                Japan
Rollins Heath Korea Co. Ltd.                                                              Korea
Rollins Hudig Hall & Co. (N.S.W.) Pty. Ltd.                                               Australia
Rollins Hudig Hall (Hong Kong) Ltd.                                                       Hong Kong
Rollins Hudig Hall (Nederland) Limited                                                    United Kingdom
Rollins Hudig Hall (Scandinavia) A/S                                                      Norway
Rollins Hudig Hall Associates B.V.                                                        Netherlands
Rollins Hudig Hall Finance bv                                                             Netherlands
Rollins Hudig Hall Mexico Agente De Seguros Y De Fianzas, S.A. De C.V.                    Mexico
Rollins Hudig Hall Netherlands b.v.                                                       Netherlands
Rollins Hudig Hall Services Limited                                                       United Kingdom
Rollins Hudig Hall Sweden AB                                                              Sweden
Rollins Hudig Hall Versicherungsmakler Gesellschaft m.b.H.                                Austria
Ropeco Pty Ltd.                                                                           Australia
Rostron Hancock Ltd.                                                                      United Kingdom
Roundwise Limited                                                                         United Kingdom
Ruben Entertainment Insurance Services                                                    United Kingdom
RUMEX VermogensverwaltungsGmbH                                                            Germany
Ryan Insurance Group France S.A.R.L.                                                      France
Ryan Warranty Services Canada, Inc.                                                       Canada
Ryan Warranty Services Quebec, Inc.                                                       Ontario
Rydata Limited                                                                            United Kingdom

                                     - 30 -
<PAGE>
S A Credit & Insurance Brokers (Pty) Limited                                              South Africa
S W Holdings (SA) (Pty) Limited                                                           South Africa
S W Insurance Brokers (Pty) Limited                                                       South Africa
S. Mark Brockinton & Associates of Texas, Inc.                                            Texas
S.A.B. S.p.A.                                                                             Italy
Saat Van Marwijk Beheer bv                                                                Netherlands
Saat Van Marwijk Noordwijk B.V.                                                           Netherlands
Salud Centurion Ltda. Agente de Medicina Prepagada                                        Colombia
Sang Woon Agency                                                                          Korea
Santos da Cunha, Abreu & Associados, Lda.                                                 Portugal
SASE France Societe Des Assures Du Sud Set                                                France
Savoy Insurance Brokers Ltd.                                                              United Kingdom
Saxonbeech Ltd.                                                                           United Kingdom
Scarborough & Company, Inc.                                                               Delaware
Sceptre Agency, Inc.                                                                      Texas
Schinasi Athesina                                                                         Italy
Schinasi Insurance Broker                                                                 Italy
Schinasi Veneto                                                                           Italy
Scottish & Commonwealth Insurance Co. Ltd.                                                Bermuda
Seascope Cargo Insurance Services Limited                                                 United Kingdom
Seascope Insurance Holdings Limited                                                       United Kingdom
Seascope Marine Limited                                                                   United Kingdom
Securities Guarantee Company Limited                                                      United Kingdom
Sedgwick Brichetto Argentina SA                                                           Argentina
Sedgwick Corredores de Reaseguros Ltda                                                    Colombia
Sedgwick Correduria de Seguros SA                                                         Spain
Seguros Inchcape Macau Lda.                                                               Macau
Select Direct Limited                                                                     Scotland
Select Healthcare Insurance Services                                                      California
Service Protection, Inc.                                                                  Illinois
Service Saver, Incorporated                                                               Florida
ServicePlan of Florida, Inc.                                                              Florida
ServicePlan, Inc.                                                                         Illinois
Servicios A.B.S., S.A.                                                                    Mexico
Servicios Inmoboliarios Guadalajara, S.C.                                                 Mexico
Servicios Y Garantias Ryan S.L.                                                           Spain
SGAP SA                                                                                   France
SGL Logistica Srl                                                                         Italy
Sherwood Insurance Agency, Inc. of New York                                               New York
Sherwood Insurance Services                                                               California
Sherwood Insurance Services of Washington, Inc.                                           Washington
SHL Pacific Regional Holdings Inc.                                                        California
Shoreline Insurance Agency, Inc.                                                          Rhode Island
Simco Insurance Brokers Pte                                                               Singapore
SIS Services of New York, Inc.                                                            New York
SLE Worldwide Australia Pty Limited                                                       Australia
SLE Worldwide Limited                                                                     United Kingdom

                                     - 31 -
<PAGE>
SLE Worldwide Mexico, Agente de Seguros, S.A. de C.V.                                     Mexico
SLE Worldwide, Inc.                                                                       Delaware
SN Re SA (Brichetto Sudamericana)                                                         Argentina
Societe Centrale de Courtage d'Assurances                                                 France
Societe Europeenne d'Etudes et de Courtages - SEEC SA                                     France
Sodarcan Inc.                                                                             Canada
Sodartec Inc.                                                                             Canada
Soriero & Company, Inc.                                                                   Texas
Sorim (1987) Ltd.                                                                         United Kingdom
Sorim Services (1987) Ltd.                                                                United Kingdom
Sothanasiri Co. Ltd.                                                                      Thailand
Southern Cross Underwriting Pty. Limited                                                  Australia
Special Risk Resources Insurance Agency, Inc.                                             California
Special Risk Services Limited                                                             United Kingdom
Special Risk Services, Inc.                                                               New York
Specialty Benefits, Inc.                                                                  Indiana
Spicafab Limited                                                                          United Kingdom
Steetley Leslie & Godwin Limited                                                          Guernsey
Stenhouse (South East Asia) Pte. Ltd.                                                     Singapore
Stenhouse Marketing Services (London) Ltd.                                                United Kingdom
Stenhouse Marketing Services, Inc.                                                        Delaware
Sterling Life Insurance Company                                                           Arizona
Stichting Employee Fund Aon                                                               Netherlands
Stichting Werknemerscertificaten HLG                                                      Netherlands
Structured Compensation Ltd.                                                              United Kingdom
Sumner & McMillan                                                                         United Kingdom
Sumner & McMillan Limited (Ireland)                                                       Ireland
Superannuation Fund (CICNZ) Limited                                                       New Zealand
Superannuation Management Nominees Ltd.                                                   New Zealand
Surety & Guarantee Consultants Limited                                                    United Kingdom
Surveyors Claims Services Ltd.                                                            United Kingdom
Suys & Janssens SA                                                                        Belgium
Swaziland Construction Insurance Brokers (Pty) Ltd.                                       Swaziland
Swaziland Corporate Risk Management (Pty) Ltd.                                            Swaziland
Swaziland Employee Benefit Consultants (Pty) Ltd.                                         Swaziland
Swaziland Insurance Brokers (Pty) Ltd.                                                    Swaziland
Swaziland Reinsurance Brokers (Pty) Ltd.                                                  Swaziland
Swett & Crawford                                                                          California
Swett & Crawford Ins. Agency of Massachusetts, Inc.                                       Massachusetts
Swett & Crawford of Arizona, Inc.                                                         Arizona
Swett & Crawford of Colorado, Inc.                                                        Colorado
Swett & Crawford of Connecticut, Inc.                                                     Connecticut
Swett & Crawford of Hawaii, Inc.                                                          Hawaii
Swett & Crawford of Idaho, Inc.                                                           Idaho
Swett & Crawford of Maine, Inc.                                                           Maine
Swett & Crawford of Nevada, Inc.                                                          Nevada
Swett & Crawford of Ohio, Inc.                                                            Ohio

                                     - 32 -
<PAGE>
Swett & Crawford of Texas, Inc.                                                           Texas
Swett Insurance Managers of California, Inc.                                              California
Swett Insurance Managers of Pennsylvania, Inc.                                            Pennsylvania
T M Insurance Brokers (Pty) Limited                                                       South Africa
Tabma-Hall Insurance Services Pty. Limited                                                Australia
Tecsefin Centroamerica, S.A.                                                              Panama
Tecsefin Guatemala                                                                        Panama
Tecsefin Salvador                                                                         Panama
Tecsefin, S.A.                                                                            Colombia
Ted Harty & Associates, Inc.                                                              Georgia
Terbroker srl                                                                             Italy
Tethercrest Ltd.                                                                          United Kingdom
Texecur Versicherungs Vermittlungs GmbH                                                   Germany
The Alexander Consulting Group Ltd.                                                       Canada
The Alexander Consulting Group Ltd.                                                       New Zealand
The Alexander Consulting Group Ltd.                                                       Scotland
The Credit Insurance Association France SA                                                France
The Credit Insurance Association Ltd.                                                     United Kingdom
The National Senior Membership Group Association                                          Washington
The Olympic Senior Membership Group, Inc.                                                 Washington
The Swett & Crawford Group, Inc.                                                          California
Tholwana MIB Pty Limited                                                                  South Africa
Trans Caribbean Insurance Services, Inc.                                                  American Samoa
Travellers Club International Ltd.                                                        United Kingdom
Trent Insurance Company Ltd.                                                              Bermuda
TREV Properties Corporation                                                               Delaware
TTF Insurance Services Ltd.                                                               United Kingdom
Underwriters Marine Services Limited                                                      United Kingdom
Underwriters Marine Services of Texas, Inc.                                               Texas
Underwriters Marine Services, Inc.                                                        Louisiana
Union Centurion, S.A.de C.V.                                                              Mexico
Unison Consultants Europe E.E.I.G.                                                        Belgium
Unison GEIE                                                                               Belgium
Unison SA                                                                                 Belgium
Unison Technical Services                                                                 Belgium
United Car & Van Rental Ltd.                                                              United Kingdom
United Iranian Insurance Services plc Teheran                                             Iran
Uzbeksugurta Howden Lihou                                                                 Republic of Uzbekistan
Valex Insurance Agency, Inc.                                                              Texas
Varity Risk Management Services Ltd.                                                      United Kingdom
Vassal Properties (Pty) Ltd.                                                              Botswana
Verband der Jauch & Hubener Unterstutzungskassen                                          Germany
Vesselforward Ltd.                                                                        United Kingdom
Virginia Surety Company, Inc.                                                             Illinois
VOL Properties Corporation                                                                Delaware
Wackerbarth Hardman (Holdings) Limited                                                    United Kingdom
Wackerbarth Holdings Limited                                                              United Kingdom

                                     - 33 -
<PAGE>
Wackerbarth International Holdings Bv                                                     Netherlands
WACUS Kreditversicherungsmakler GmbH                                                      Austria
WACUS Magyarorszag Hitelbitzositasi Tanacsado es Kozvetito Kft.                           Hungary
WAS Betriebsfuhrungs-GmbH                                                                 Germany
WAVECA CA                                                                                 Venezuela
Wed. Jacobs & Brom bv                                                                     Netherlands
Wexford Underwriting Managers, Inc.                                                       Delaware
Wilfredo Armstrong S.A.                                                                   Argentina
William Gallagher Associates of California, Inc.                                          California
William Gallagher Associates of Maryland, Inc.                                            Maryland
William Gallagher Associates of New Jersey, Inc.                                          New Jersey
Willis Corroon (PVT) Ltd.                                                                 Zimbabwe
Winchester Financial Services (Pty) Limited                                               South Africa
Windhock Insurance Brokers (Pty) Limited                                                  Namibia
WMD Underwriting Agencies Ltd.                                                            United Kingdom
World Insurance Network Ltd.                                                              Cardiff
World Shipping Services Ltd                                                               Italy
Worldwide Insurance Network Limited                                                       United Kingdom
Worldwide Integrated Services Company                                                     Texas
Wyrm Systems Pty Limited                                                                  South Africa
XB-Lumley Insurance Brokers (Pty) Ltd.                                                    South Africa
Y&D Properties Ltd.                                                                       Canada
Yin Hwa Insurance Agent Co Ltd.                                                           Taiwan
ZAO Aon Insurance Brokers                                                                 Russia
Zimbabwe Risk Managers (Pvt) Ltd.                                                         Zimbabwe
</TABLE>

                                     - 34 -
<PAGE>

                                                                      Exhibit 23



               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the  incorporation  by reference in this Annual Report (Form 10-K)
of Aon  Corporation of our report dated  February 8, 2000,  included in the 1999
Annual Report to Stockholders of Aon Corporation.

Our audits also included the financial  statement  schedules of Aon  Corporation
listed in Item 14(a).  These schedules are the  responsibility  of the Company's
management.  Our responsibility is to express an opinion based on our audits. In
our opinion,  with respect to which the date is February 8, 2000,  the financial
statement  schedules referred to above, when considered in relation to the basic
financial  statements taken as a whole,  present fairly in all material respects
the information set forth therein.

We also consent to the incorporation by reference in the Registration Statements
of Aon Corporation described in the following table of our report dated February
8, 2000,  with respect to the  consolidated  financial  statements  incorporated
herein by reference,  and our report,  included in the preceding  paragraph with
respect to the  financial  statement  schedules  included in this Annual  Report
(Form 10-K) of Aon Corporation.

    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-8      333-55773   Pertaining to Aon's employee stock purchase plan
      S-3      333-78723   Pertaining to the  registration  of debt  securities,
                              preferred stock and common stock


                                      ERNST & YOUNG LLP


Chicago, Illinois
March 21, 2000

<TABLE> <S> <C>

<ARTICLE>                       5
<LEGEND>
     This  schedule  contains  summary  financial   information  extracted  from
     Consolidated  Statements  of Financial Position and 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>                   12-MOS
<FISCAL-YEAR-END>               DEC-31-1999
<PERIOD-START>                  JAN-01-1999
<PERIOD-END>                    DEC-31-1999
<EXCHANGE-RATE>                         1.0
<CASH>                                3,199 <F1>
<SECURITIES>                          3,071 <F2>
<RECEIVABLES>                         7,440
<ALLOWANCES>                             94
<INVENTORY>                               0
<CURRENT-ASSETS>                          0 <F3>
<PP&E>                                1,537
<DEPRECIATION>                          821
<TOTAL-ASSETS>                       21,132
<CURRENT-LIABILITIES>                     0 <F3>
<BONDS>                               1,011 <F4>
                   850 <F5>
                               0
<COMMON>                                259 <F6>
<OTHER-SE>                            2,792
<TOTAL-LIABILITY-AND-EQUITY>         21,132
<SALES>                                   0
<TOTAL-REVENUES>                      7,070
<CGS>                                     0
<TOTAL-COSTS>                             0
<OTHER-EXPENSES>                      6,435 <F7>
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                      105
<INCOME-PRETAX>                         635
<INCOME-TAX>                            243
<INCOME-CONTINUING>                     392
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                            352
<EPS-BASIC>                            1.35 <F6>
<EPS-DILUTED>                          1.33 <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 17, 1999.
<F7>  Represents total expenses.
</FN>


</TABLE>


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