<ARTICLE> 5 <LEGEND> Regeneron Pharmaceuticals, Inc. Exhibit 27 December 31, 1998 Form 10-K (in thousands, except share data) </LEGEND> <MULTIPLIER> 1000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> DEC-31-1998 <CASH> 19,757 <SECURITIES> 93,773 <RECEIVABLES> 5,710 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 92,901 <PP&E> 59,631 <DEPRECIATION> 26,612 <TOTAL-ASSETS> 156,915 <CURRENT-LIABILITIES> 9,402 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 27 <OTHER-SE> 131,200 <TOTAL-LIABILITY-AND-EQUITY> 156,915 <SALES> 0 <TOTAL-REVENUES> 45,193 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 53,390 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 428 <INCOME-PRETAX> (8,625) <INCOME-TAX> 0 <INCOME-CONTINUING> (8,625) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (8,625) <EPS-PRIMARY> (0.28) <EPS-DILUTED> (0.28)