<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MEDIMMUNE, INC.'S YEARLY REPORT ON FORM 10-K FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FILING. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> DEC-31-1998 <CASH> 37,959 <SECURITIES> 96,923 <RECEIVABLES> 31,682 <ALLOWANCES> 0 <INVENTORY> 19,760 <CURRENT-ASSETS> 216,366 <PP&E> 74,822 <DEPRECIATION> 0 <TOTAL-ASSETS> 353,120 <CURRENT-LIABILITIES> 57,970 <BONDS> 83,195 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 547 <OTHER-SE> 209,286 <TOTAL-LIABILITY-AND-EQUITY> 353,120 <SALES> 163,440 <TOTAL-REVENUES> 200,708 <CGS> 70,236 <TOTAL-COSTS> 194,514 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 4,041 <INCOME-PRETAX> 8,812 <INCOME-TAX> (47,428) <INCOME-CONTINUING> 56,420 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 56,240 <EPS-PRIMARY> 1.06 <EPS-DILUTED> 0.91