EXHIBIT 21 LIST OF SIGNIFICANT SUBSIDIARIES OF THE BISYS GROUP, INC. AS OF JUNE 30, 2004 1. Ascensus Insurance Services, Inc., a Utah corporation 2. BISYS Commercial Insurance Services, Inc., a California corporation 3. BISYS Document Solutions LLC, a Delaware limited liability company 4. BISYS Education Services, Inc., an Indiana corporation 5. BISYS Financial Services Ltd., a Bermuda corporation 6. BISYS Financing Company, a Delaware corporation 7. BISYS Fund Services (Ireland) Ltd., an Ireland corporation 8. BISYS Fund Services Ohio, Inc., an Ohio corporation 9. BISYS Fund Services, LP, an Ohio limited partnership 10. BISYS Hedge Fund Services, Inc., a Delaware corporation 11. BISYS Hedge Fund Services (Ireland) Ltd., an Ireland corporation 12. BISYS Hedge Fund Services Limited, a Bermuda corporation 13. BISYS Information Solutions L.P., a Delaware limited partnership 14. BISYS Insurance Services Holding Corp., a Delaware corporation 15. BISYS Insurance Services, Inc., a Pennsylvania corporation 16. BISYS Private Equity Services, Inc., a Delaware corporation 17. BISYS Retirement Services, Inc., a Delaware corporation 18. Boston Institutional Services, Inc., a Massachusetts corporation 19. Hanleigh Management, Inc., a New Jersey corporation 20. Life Brokerage Corporation, a Florida corporation 21. Potomac Insurance Marketing Group, Inc., a Maryland corporation 22. Select Insurance Marketing Corp., a Washington corporation 23. The TONER Organization, Inc., a Pennsylvania corporation 24. Universal Pensions, Inc., a Minnesota corporation 25. USA Insurance Group, Inc., a Florida corporation