EXHIBIT 21 SUBSIDIARIES OF GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY SUBSIDIARIES OF GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY SUBSIDIARY JURISDICTION OF INCORPORATION OR OGRANIZATION Benefits Communication Corporation (1) Delaware BenefitsCorp Equities, Inc. Delaware Confed Admin Services, Inc. Delaware Financial Administrative Services Corporation (2) Colorado Great-West Benefit Services, Inc. Delaware Great-West Realty Investments, Inc. Delaware Greenwood Property Corporation Colorado GW Capital Management, Inc. Colorado GWL Properties, Inc. Colorado Maxim Series Fund, Inc. Maryland One Corporation Colorado One Health Plan of California, Inc. California One Health Plan of Colorado, Inc. Colorado One Health Plan of Georgia, Inc. Georgia One Health Plan of Illinois, Inc. Illinois One Health Plan of North Carolina, Inc. North Carolina One Health Plan of Texas, Inc. Texas One Orchard Equities, Inc. Colorado (1) Also doing business as Benefits Insurance Services, Inc. (2) Also doing business as Financial Administrative Services Corporation of Colorado.