EXHIBIT 21 LIST OF SIGNIFICANT SUBSIDIARIES OF THE BISYS GROUP, INC. AS OF JUNE 30, 2003 1. Ascensus Insurance Services, Inc., a Utah corporation 2. BIS LP Inc., a Delaware corporation 3. BISYS Document Solutions L.P., a Delaware limited partnership 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 Ohio, Inc., an Ohio corporation 8. BISYS Fund Services, Inc., a Delaware 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 Holdings II, a Delaware corporation 14. BISYS Information Solutions L.P., a Delaware limited partnership 15. BISYS Insurance Services Holding Corp., a Delaware corporation 16. BISYS Insurance Services, Inc., a Pennsylvania corporation 17. BISYS, Inc., a Delaware corporation 18. BISYS Private Equity Services, Inc., a Delaware corporation 19. BISYS Retirement Services Holding Corp., a Delaware corporation 20. BISYS Retirement Services, Inc., a Delaware corporation 21. Document Solutions, Inc., a Delaware corporation 22. DSI LP Inc., a Delaware corporation 23. Hanleigh Management, Inc., a New Jersey corporation 24. Life Brokerage Corporation, a Florida corporation 25. Potomac Insurance Marketing Group, Inc., a Maryland corporation 26. Select Insurance Marketing Corp., a Washington corporation 27. The TONER Organization, Inc., a Pennsylvania corporation 28. Tri-City Brokerage of Illinois, Inc., an Illinois corporation 29. Tri-City Brokerage, Inc., a California corporation 30. Tri-City Insurance Brokers, Inc., a New York corporation 31. Universal Pensions, Inc., a Minnesota corporation