EXHIBIT 21.0 SUBSIDIARIES OF GALLAGHER In the following list of subsidiaries of Gallagher, 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 Protected Insurance Company................................... Bermuda Arthur J. Gallagher & Co.--Little Rock........................ Arkansas Arthur J. Gallagher & Co. of Georgia, Inc..................... Georgia Arthur J. Gallagher (UK) Limited.............................. England Risk Management Partners Ltd.(3)............................ England John Plumer & Company Limited............................... England Morgan Insurance Services Limited........................... England 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 State or Other Jurisdiction of Name Incorporation - ---- --------------- 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 Arthur J. Gallagher & Co.--Kansas City, Inc.................. Missouri 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 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 AJG Premium Finance, Inc................................... Illinois Lamberson Koster & Company................................... California Arthur J. Gallagher & Co. of Tennessee, Inc.................. Tennessee Arthur J. Gallagher & Co. of Kentucky, Inc................... Kentucky Gallagher Benefit Services, Inc.............................. Delaware Gallagher Benefit Services of Michigan, Inc................ Michigan Gallagher Benefit Services of the Carolinas, Inc........... North Carolina Gallagher Benefit Services of Colorado, Inc................ Colorado Gallagher Benefit Services of Kansas City, Inc............. Delaware Gallagher Benefit Services of New York, Inc................ New York Gallagher Benefit Services of Texas, Inc................... Texas Gallagher Benefit Services of Washington, D.C.............. Delaware Generation 2000 Loss Control Services, Inc................... Tennessee Risk Placement Services of Texas, Inc........................ Texas Arthur J. Gallagher Service Company.......................... Delaware - -------- (1) Gallagher conducts some of its operations under the following names: 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.