Exhibit 21.1

SUBSIDIARIES OF INSPERITY, INC.

•   Insperity Holdings, Inc., a Delaware corporation and wholly owned subsidiary of Insperity, Inc.

•   Insperity Enterprises, Inc., a Texas corporation and wholly owned subsidiary of Insperity Holdings, Inc.

•   Administaff Partnerships Holding, Inc., a Delaware corporation and wholly owned subsidiary of Insperity Holdings, Inc.

•   Insperity Captive Insurance Companies Limited, a Bermuda corporation and wholly owned subsidiary of Administaff Partnerships Holding, Inc.

•   Insperity Business Services, L.P., a Delaware limited partnership, with Insperity Holdings, Inc. being a 1% general partner and Administaff Partnerships Holding, Inc. being a 99% limited partner.

•   Insperity Retirement Services, L.P., a Delaware limited partnership, with Insperity Holidngs, Inc. being a 1% general partner and Administaff Partnerships Holding, Inc. being a 99% limited partner.

•   Insperity Services, L.P., a Delaware limited partnership, with Insperity Holdings, Inc. being a 1% general partner and Administaff Partnerships Holding, Inc. being a 99% limited partner.

•   Administaff Partnerships Holding II, Inc., a Delaware corporation and wholly owned subsidiary of Insperity Services, L.P.

•   Insperity GP, Inc., a Delaware corporation and wholly owned subsidiary of Insperity Services, L.P.

•   Insperity Support Services, L.P., a Delaware limited partnership, with Insperity GP, Inc. being a 1% general partner and Administaff Partnerships Holding II, Inc. being a 99% limited partner.

•   Administaff Companies, Inc., a Delaware corporation and wholly owned subsidiary of Insperity Holdings, Inc.

•   Administaff Partnerships Holding III, Inc., a Delaware corporation and wholly owned subsidiary of Administaff Companies, Inc.

•   Insperity PEO Services, L.P., a Delaware limited partnership, with Administaff Companies, Inc. being a 1% general partner and Administaff Partnerships Holding III, Inc. being a 99% limited partner.

•   Insperity Insurance Services, L.L.C., a Delaware limited liability corporation and wholly owned subsidiary of Insperity PEO Services, L.P.

• Insperity Employment Screening, L.L.C, a Delaware limited liability corporation and wholly owned subsidiary of Insperity Holdings, Inc.

• Insperity Expense Management, Inc. a California Corporation and wholly owned subsidiary of Insperity Holdings, Inc.

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