| AON FINANCIAL SERVICES GROUP OF NEW YORK, INC. | — | F032529 | 1998-12-21 | Withdrawn | CHICAGO |
| AON FINANCIAL SERVICES GROUP, INC. | — | F020639 | 1989-06-08 | Withdrawn | CHICAGO |
| AON FIRE PROTECTION ENGINEERING CORPORATION | — | F062290 | 2011-04-21 | Withdrawn | — |
| AON HEALTHCARE INSURANCE SERVICES, INC. | — | F033993 | 1999-10-29 | Withdrawn | CHICAGO |
| AON HEWITT INVESTMENT CONSULTING, INC. | — | F062199 | 2011-04-11 | Active | — |
| Aon Insurance Agency LLC | — | E034974 | 2000-04-10 | Active | — |
| AON INSURANCE SERVICES, INC. | — | F027196 | 1995-10-10 | Withdrawn | — |
| AON INTERNATIONAL ENERGY, INC. | — | F047704 | 2006-01-27 | Withdrawn | CHICAGO |
| AON NATIONAL FLOOD SERVICES, INC. | — | F029226 | 1997-02-07 | Revoked | CHICAGO |
| AON Pharmacy, LLC | — | E1120739 | 2019-06-01 | Active | — |
| AON PREMIUM FINANCE, LLC | — | E045689 | 2005-04-11 | Active | — |
| AON PRIVATE RISK MANAGEMENT INSURANCE AGENCY, INC. | — | F031151 | 1998-03-20 | Active | — |
| AON RISK INSURANCE SERVICES WEST, INC. | — | F012311 | 1980-03-17 | Active | — |
| AON RISK RESOURCES INSURANCE AGENCY, INC. | — | F031178 | 1998-03-24 | Withdrawn | — |
| AON RISK SERVICES CENTRAL, INC | — | F033922 | 1999-10-15 | Active | — |
| AON RISK SERVICES INC. OF MARYLAND | — | F012906 | 1980-11-28 | Active | — |
| AON RISK SERVICES NORTHEAST, INC. | — | F014426 | 1982-04-27 | Active | — |
| AON RISK SERVICES OF MISSOURI, INC. | — | F022732 | 1991-12-23 | Merged | CHICAGO |
| AON RISK SERVICES OF MISSOURI, INC. | — | F034029 | 1999-11-05 | Withdrawn | CHICAGO |
| AON RISK SERVICES OF TEXAS, INC. | — | F020028 | 1988-10-06 | Withdrawn | CHICAGO |
| AON RISK SERVICES SOUTH, INC. | — | F036116 | 2000-11-13 | Active | — |
| AON RISK SERVICES SOUTHWEST, INC. | — | F013385 | 1981-05-11 | Active | — |
| AON RISK SERVICES, INC. OF ARIZONA | — | F020611 | 1989-05-31 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF ARKANSAS | — | F036508 | 2001-01-16 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF CENTRAL CALIFORNIA INSURANCE SERVICES | — | F025381 | 1994-05-25 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF COLORADO | — | F021706 | 1990-09-19 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF CONNECTICUT | — | F015950 | 1983-12-29 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF CONNECTICUT | — | F028699 | 1996-10-07 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF FLORIDA | — | F052658 | 2007-10-30 | Active | — |
| AON RISK SERVICES, INC. OF GEORGIA | — | F033929 | 1999-10-18 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF GEORGIA | — | F028173 | 1996-05-30 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF IDAHO | — | F033349 | 1999-06-17 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF ILLINOIS | — | F021403 | 1990-05-18 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF INDIANA INC. | — | F013838 | 1981-10-13 | Withdrawn | — |
| AON RISK SERVICES, INC. OF KANSAS | — | F034129 | 1999-11-23 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF KANSAS | — | F019327 | 1987-12-04 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF KENTUCKY | — | F024314 | 1993-07-16 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF LOUISIANA | — | F022220 | 1991-05-03 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF MASSACHUSETTS | — | F025857 | 1994-09-30 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF MICHIGAN | — | F026687 | 1995-06-05 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF MICHIGAN | — | F013688 | 1981-08-17 | Withdrawn | — |
| AON RISK SERVICES, INC. OF MINNESOTA | — | F022825 | 1992-02-03 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF MINNESOTA | — | F034187 | 1999-12-03 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF MONTANA. | — | D040551 | 1974-08-26 | Merged | — |
| AON RISK SERVICES, INC. OF NEBRASKA | — | F034188 | 1999-12-03 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF NEW JERSEY | — | F022291 | 1991-05-31 | Merged | CHICAGO |
| AON RISK SERVICES, INC. OF NEW JERSEY | — | F034119 | 1999-11-23 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF NEW MEXICO | — | F033483 | 1999-07-14 | Revoked | SANTA FE |
| AON RISK SERVICES, INC. OF NEW MEXICO | — | F040908 | 2003-03-03 | Withdrawn | CHICAGO |
| AON RISK SERVICES, INC. OF NEW YORK | — | F021049 | 1989-12-05 | Revoked | CHICAGO |