<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MEDIMMUNE, INC'S QUARTERLY REPORT ON FORM 10-Q FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FILING. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> SEP-30-1999 <CASH> 9,366 <SECURITIES> 149,944 <RECEIVABLES> 23,711 <ALLOWANCES> 0 <INVENTORY> 28,673 <CURRENT-ASSETS> 225,509 <PP&E> 81,575 <DEPRECIATION> 0 <TOTAL-ASSETS> 416,408 <CURRENT-LIABILITIES> 39,526 <BONDS> 17,489 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 633 <OTHER-SE> 356,711 <TOTAL-LIABILITY-AND-EQUITY> 416,408 <SALES> 167,397 <TOTAL-REVENUES> 187,871 <CGS> 46,649 <TOTAL-COSTS> 156,041 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,332 <INCOME-PRETAX> 36,548 <INCOME-TAX> 12,935 <INCOME-CONTINUING> 23,613 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 23,613 <EPS-BASIC> 0.41 <EPS-DILUTED> 0.37