EXHIBIT 21.0 SUBSIDIARIES OF THE COMPANY In the following list of subsidiaries of the Company, those companies which are indented represent subsidiaries of the corporation under which they are indented. Except for directors' qualifying shares, 100% of the voting stock of each of the subsidiaries listed below, other than those indicated by footnote, is owned of record or beneficially by its indicated parent.(1) State or Other Jurisdiction of Name Incorporation - ---- --------------- Arthur J. Gallagher & Co. (Registrant).......................... Delaware Arthur J. Gallagher & Co. (Illinois).......................... Illinois Arthur J. Gallagher & Co. of Oklahoma, Inc.................. Oklahoma Arthur J. Gallagher Risk Management Services, Inc........... Illinois Arthur J. Gallagher & Co. of Michigan, Inc................ Michigan Arthur J. Gallagher & Co. of Wisconsin, Inc............... Wisconsin Arthur J. Gallagher & Co. of Pennsylvania, Inc............ Pennsylvania Gallagher Captive Services, Inc........................... Delaware Arthur J. Gallagher & Co.--Chicago Metro...................... Illinois Arthur J. Gallagher & Co. (St. Louis)......................... Delaware Gallagher Holt, Inc........................................... Texas Arthur J. Gallagher Inc..................................... Texas Gallagher Braniff, Inc........................................ Texas Arthur J. Gallagher & Co. (Florida)........................... Florida Arthur J. Gallagher & Co. of New York, Inc.................... New York Arthur J. Gallagher & Co. Ohio Agency, Inc.................... Ohio Risk Placement Services, Inc.................................. Illinois Arthur J. Gallagher & Co.--Greenville......................... South Carolina Arthur J. Gallagher and Co. of Massachusetts, Inc............. Massachusetts Gallagher Insurance Advisors, Inc........................... Massachusetts Arthur J. Gallagher & Co. of Rhode Island, Inc................ Rhode Island Arthur J. Gallagher International, Inc........................ Delaware Arthur J. Gallagher & Co. (Bermuda) Limited................... Bermuda Arthur J. Gallagher Intermediaries (Bermuda) Limited........ Bermuda Arthur J. Gallagher Management (Bermuda) Limited............ Bermuda Gallagher Captive Services (Cayman) Limited................. Cayman Islands Scholastic Risk Services Limited............................ Bermuda Artex Insurance Company Ltd(2).............................. Bermuda Artex Underwriting Managers Ltd............................. Bermuda Arthur J. Gallagher & Co.--Little Rock........................ Arkansas Arthur J. Gallagher & Co. of Georgia, Inc..................... Georgia Gallagher Plumer Holdings Limited............................. England Arthur J. Gallagher (UK) Limited.............................. England Risk Management Partners Ltd.(3)............................ England John Plumer & Company Limited............................... England John Plumer & Partners Limited.............................. England John Plumer & Partners Marine Limited..................... England Arthur J. Gallagher Aviation Limited........................ England AJG Twenty Limited.......................................... England AJG Twenty One Limited...................................... England AJG Twenty Two Limited...................................... England AJG Twenty Three Limited.................................... England Arthur J. Gallagher & Partners (UK) Limited................. England Morgan, Read & Coleman (Holdings) Limited................... England Gallagher, Read & Coleman Limited......................... England Morgan, Read & Coleman (Sweden) AB........................ Sweden Morgan Insurance Services Limited........................... England State or Other Jurisdiction of Name Incorporation - ---- --------------- Gallagher Bassett Services, Inc.............................. Delaware Gallagher Bassett of New York, Inc......................... New York Gallagher Bassett International Ltd........................ Delaware Gallagher Bassett International Ltd. (UK).................. England Gallagher Bassett Canada Inc............................... Canada Gallagher Benefit Administrators, Inc...................... Illinois Gallagher Bassett Investigative Services, Inc.............. Delaware Wyatt Gallagher Bassett Pty Ltd(3)......................... Australia Gallagher Bassett Australia Pty Ltd...................... Australia Wyatt Emerson Pty Ltd.................................... Australia Wyatt Group (PNG) Pty Ltd................................ New Guinea Gallagher Bassett International S.A.......................... France Arthur J. Gallagher & Co. Insurance Brokers of California, Inc......................................................... California Charity First Insurance Services, Inc...................... California Arthur J. Gallagher & Co. of Connecticut, Inc................ Connecticut Arthur J. Gallagher Intermediaries, Inc...................... New York LHC of Illinois, Inc......................................... Illinois Arthur J. Gallagher & Co.--Denver............................ Colorado Arthur J. Gallagher & Co. of Washington, Inc................. Washington Gallagher Louisiana, Inc..................................... Louisiana Arthur J. Gallagher of Louisiana, Inc...................... Louisiana Arthur J. Gallagher & Co. of Mississippi, Inc................ Mississippi Gallagher ABOW, Inc.......................................... Michigan Arthur J. Gallagher & Co.--Kansas City, Inc.................. Missouri Gallagher Benefit Services of Kansas City, Inc............. Delaware IMC Insurance Management Corporation....................... Missouri IMC Services Corporation................................. Missouri GBS Retirement Services, Inc................................. New York Arthur J. Gallagher & Co. of New Jersey, Inc................. New Jersey Arthur J. Gallagher & Co. Ohio Life Agency, Inc.............. Ohio Gallagher Pipino, Inc........................................ Ohio Gallagher Benefit Services of Texas, Inc..................... Texas Arthur J. Gallagher & Co. of Minnesota, Inc.................. Minnesota Gallagher Alliance Insurance Services, Inc................... Arizona AJG Financial Services, Inc.................................. Delaware AJG Capital, Inc.(4)....................................... Illinois AJG Investments, Inc....................................... Delaware Gallagher Benefit Services of Colorado, Inc.................. Colorado Lamberson Koster & Company................................... California Arthur J. Gallagher & Co. of Tennessee, Inc.................. Tennessee Arthur J. Gallagher & Co. of Kentucky, Inc................... Kentucky AJG Premium Finance, Inc..................................... Illinois Risk Management Products Canada Inc.(3)...................... Canada Gallagher Benefit Services of New York, Inc.................. New York Gallagher Benefit Services of the Carolinas, Inc............. North Carolina - -------- (1) The Company conducts some of its operations under the following names: Gallagher Benefit Services; Gallagher Bassett Information Services; Gallagher Risk Management Services; Pacific Atlantic Administrators; The Boston Insurance Center; Gallagher Heffernan; Broussard, Bush & Hurst; Henley, Williams & Associates; Gallagher Steel Agency; Bryce Insurance; CMC Claims Management Corporation; The Planning Corporation; Environmental Claims Management Incorporated; Gallagher Byerly, Inc.; Innovative Risk Services, Inc.; and International Special Risk Services, Inc. (2) 76% of the Common Stock of this subsidiary is owned by two third parties. (3) 50% of the Common Stock of each of these subsidiaries is owned by an unrelated party. (4) 10% of the Common Stock of this subsidiary is owned by an unrelated party.