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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
  
FORM 8-K
  
CURRENT REPORT
 
 
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
 
Date of Report (Date of earliest event reported):  March 31, 2011
 
 
SPIRE CORPORATION
(Exact Name of Registrant as Specified in Charter)
  
Massachusetts
 
0-12742
 
04-2457335
(State or Other Jurisdiction of Incorporation)
 
(Commission
File Number)
 
(IRS Employer
Identification No.)
  
One Patriots Park, Bedford, Massachusetts
 
01730-2396
(Address of Principal Executive Offices)
 
(Zip Code)
 
 
Registrant’s telephone number, including area code: (781) 275-6000
 
Not Applicable
(Former name or address, if changed since last report)
 
 
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
 
o         Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
 
o         Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
 
o         Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
 
o         Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
 
 
 
 
 
 
 

ITEM 1.01    ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT.
On March 31, 2011, Silicon Valley Bank (the “Bank”) agreed to increase the letter of credit sub-facility under Spire Corporation's credit facility with the Bank from $1.5 million to $2.5 million. All other terms and conditions under the credit facility remain the same.
 

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SIGNATURES
 
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
 
 
 
SPIRE CORPORATION
 
 
 
 
 
Date:  April 5, 2011
By:
/s/ Robert S. Lieberman
 
 
Robert S. Lieberman 
 
 
Chief Financial Officer and Treasurer 
 
 
 

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