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THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SIEBEL SYSTEMS, INC. QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED September 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. 1,000 9-MOS Jan-01-2000 Dec-31-2000 Sep-30-2000 858,603 309,706 353,193 0 0 1,604,155 137,430 0 1,814,166 507,527 0 0 0 421 1,004,789 1,814,166 735,766 1,180,854 13,957 298,625 670,696 0 0 259,951 102,033 157,918 0 0 0 157,918 0.15 0.12 1 ITEM IS SHOWN NET OF ALLOWANCE, CONSISTENT WITH BALANCE SHEET PRESENTATION.