<ARTICLE> 5 <LEGEND> THIS SCHEUDLE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE UNAUDITED CONSOLIDATED FINANCIAL STATEMENT OF ADE CORPORATION FOR THE NINE MONTHS ENDED JANAURY 31, 1999. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> APR-30-1999 <PERIOD-START> MAY-1-1998 <PERIOD-END> JAN-31-1999 <CASH> 61,628 <SECURITIES> 0 <RECEIVABLES> 10,838 <ALLOWANCES> 0 <INVENTORY> 26,057 <CURRENT-ASSETS> 113,997 <PP&E> 24,693 <DEPRECIATION> 0 <TOTAL-ASSETS> 153,843 <CURRENT-LIABILITIES> 15,703 <BONDS> 8,722 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 132 <OTHER-SE> 129,862 <TOTAL-LIABILITY-AND-EQUITY> 153,843 <SALES> 48,699 <TOTAL-REVENUES> 48,699 <CGS> 36,465 <TOTAL-COSTS> 36,465 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> (2,115) <INCOME-PRETAX> (22,792) <INCOME-TAX> (8,235) <INCOME-CONTINUING> (14,557) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (15,311) <EPS-PRIMARY> (1.18) <EPS-DILUTED> (1.18)