<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE SPIRE CORPORATION UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS ON FORM 10-QSB FOR THE PERIOD ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM 10-QSB. </LEGEND> <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JUL-01-1999 <PERIOD-END> SEP-30-1999 <CASH> 333,422 <SECURITIES> 0 <RECEIVABLES> 3,196,389 <ALLOWANCES> 102,000 <INVENTORY> 1,908,550 <CURRENT-ASSETS> 3,094,388 <PP&E> 26,091,593 <DEPRECIATION> 21,650,544 <TOTAL-ASSETS> 10,350,875 <CURRENT-LIABILITIES> 5,497,231 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 37,972 <OTHER-SE> 4,815,672 <TOTAL-LIABILITY-AND-EQUITY> 10,350,875 <SALES> 604,760 <TOTAL-REVENUES> 2,722,028 <CGS> 502,679 <TOTAL-COSTS> 3,550,823 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> (33,309) <INCOME-PRETAX> (862,104) <INCOME-TAX> 0 <INCOME-CONTINUING> (862,104) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (862,104) <EPS-BASIC> (0.27) <EPS-DILUTED> (0.27)