1 EXHIBIT 21 -- LIST OF SIGNIFICANT SUBSIDIARIES OF THE BISYS GROUP, INC. AS OF SEPTEMBER 28, 1999 1. BISYS, Inc., a Delaware corporation 2. BISYS Plan Services, L.P., a Pennsylvania limited partnership 3. BISYS Research Services, Inc., a Delaware corporation 4. BISYS Fund Services, Inc., a Delaware corporation 5. Document Solutions, Inc., a Delaware corporation 6. Concord Holding Corporation, a Delaware corporation 7. BISYS Insurance Services, Inc., a Pennsylvania corporation 8. BISYS Networking Services, Inc., a Massachusetts corporation 9. BISYS Brokerage Services, Inc., a California corporation 10. BISYS Education Services, Inc., a Louisiana corporation