Filed pursuant to Rule No. 424(b)(3) File Number 333-62154 PROSPECTUS SUPPLEMENT NO. 12 THE BISYS GROUP, INC. $300,000,000 4% Convertible Subordinated Notes due 2006 and shares of common stock issuable upon conversion of the notes This prospectus supplement supplements the prospectus dated June 15, 2001 of The BISYS Group, Inc. relating to the sale by certain of our securityholders (including their pledgees, donees, assignees, transferees, successors and others who later hold any of the securityholders' interests) of up to $300,000,000 principal amount at maturity of notes and the shares of common stock issuable upon conversion of the notes. You should read this prospectus supplement in conjunction with the prospectus, and this prospectus supplement is qualified by reference to the prospectus, except to the extent that the information in this prospectus supplement supersedes the information contained in the prospectus. The following represents updated information regarding the selling securityholder listed in the selling securityholder table in the prospectus: Aggregate Principal Number of Amount at Shares of Percentage of Maturity of Percentage of Common Stock Shares of Notes That Notes That May Be Common Stoc, Name May Be Sold Outstand Sold (1) Outstanding (2) - ------------------------------------- --------------- ---------------- -------------- --------------- Occidental Petroleum Corporation..... $37,000 * 1,108 * _____________ * Less than one percent (1%). (1) Assumes conversion of all of the holder's notes at a conversion rate of 29.9458 shares of common stock per $1,000 principal amount at maturity of the notes. We adjusted the conversion rate in February 2002 to reflect a 2-for-1 stock split in our outstanding shares of common stock effected in the form of a stock dividend. This conversion rate is subject to further adjustment, however, as described under "Description of the Notes-Conversion Rights". As a result, the number of shares of common stock issuable upon conversion of the notes may increase or decrease in the future. (2) Calculated based on Rule 13d-3(d)(i) of the Exchange Act, using 119,717,723 shares of common stock outstanding as of January 31, 2003. In calculating this amount for each holder, we treated as outstanding the number of shares of common stock issuable upon conversion of all of that holder's notes, but we did not assume conversion of any other holder's notes. Investing in the notes or shares of common stock involves risks that are described in the "Risk Factors" section beginning on page 6 of the prospectus. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is March 6, 2003.