Document:

EXHIBIT 10(ac)
                                                                  --------------

                       SECOND LOAN MODIFICATION AGREEMENT

         This Second Loan Modification Agreement (this "Loan Modification
Agreement") is entered into as of the Second Loan Modification Effective Date by
and between SILICON VALLEY BANK, a California corporation, with its principal
place of business at 3003 Tasman Drive, Santa Clara, California 95054 and with a
loan production office located at One Newton Executive Park, Suite 200, 2221
Washington Street, Newton, Massachusetts 02462 ("Bank") and SPIRE CORPORATION, a
Massachusetts corporation, SPIRE SOLAR, INC., a Massachusetts corporation, SPIRE
BIOMEDICAL, INC., a Massachusetts corporation, each with offices located at One
Patriots Park, Bedford, Massachusetts 01730, and SPIRE SEMICONDUCTOR, LLC, a
Delaware limited liability company (formerly known as Bandwidth Semiconductor,
LLC), with offices at 25 Sagamore Park Road, Hudson, NH 03051 (jointly and
severally, individually and collectively, the "Borrower").

1.       DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other
indebtedness and obligations which may be owing by Borrower to Bank, Borrower is
indebted to Bank pursuant to a loan arrangement dated as of May 25, 2007,
evidenced by, among other documents, a certain Loan and Security Agreement dated
as of May 25, 2007, between Borrower and Bank, as amended by a certain First
Loan Modification Agreement dated as of March 31, 2008 (as amended, the "Loan
Agreement"). Capitalized terms used but not otherwise defined herein shall have
the same meaning as in the Loan Agreement.

2.       DESCRIPTION OF COLLATERAL. Repayment of the Obligations is secured by
the Collateral as described in the Loan Agreement (together with any other
collateral security granted to Bank, the "Security Documents").

Hereinafter, the Security Documents, together with all other documents
evidencing or securing the Obligations shall be referred to as the "Existing
Loan Documents".

3.       DESCRIPTION OF CHANGE IN TERMS.

         A.  Modifications to Loan Agreement.

             1   The Loan Agreement shall be amended by deleting the following
                 provision appearing as Section 2.2(a) thereof:

                     " (a) Interest Rate. Subject to Section 2.2(b), the
                 principal amount outstanding for each Equipment Advance shall
                 accrue interest at a floating per annum rate equal to one half
                 of one percentage point (0.5%) above the Prime Rate, which
                 interest shall be payable monthly. Commencing on the 2008
                 Closing Date, and subject to Section 2.2(b), the principal
                 amount outstanding for each Equipment Advance shall accrue
                 interest at a floating per annum rate equal to one percentage
                 point (1.0%) above the Prime Rate, which interest shall be
                 payable monthly."

                 and inserting in lieu thereof the following:

                     " (a) Interest Rate. Subject to Section 2.2(b), the
                 principal amount outstanding for each Equipment Advance shall
                 accrue interest at a floating per annum rate equal to one half
                 of one percentage point (0.50%) above the Prime Rate, which
                 interest shall be payable monthly. Commencing on the 2008
                 Closing Date, and subject to Section 2.2(b), the principal
                 amount outstanding for each Equipment Advance shall accrue
                 interest at a floating per annum rate equal to one percentage
                 point (1.00%) above the Prime Rate, which interest shall be
                 payable monthly. Commencing on the Second Loan Modification
                 Effective Date, and subject to Section 2.2(b), the principal
                 amount outstanding for each Equipment Advance shall accrue
                 interest at a floating per annum rate equal to one and three
                 quarters percentage points (1.75%) above the Prime Rate, which
                 interest shall be payable monthly."

             2   The Loan Agreement shall be amended by deleting the following
                 text appearing as Section 6.7(b) thereof, entitled
                 "Profitability":

                                        1
<PAGE>
                     " (b) Profitability. A minimum Net Income, on a trailing
                 six (6) month basis, of (i) not less than ($1,000,000), for
                 each monthly period beginning on the Effective Date through and
                 including May 31, 2008; and (ii) not less than $1.00, for each
                 monthly period beginning June 1, 2008 and thereafter."

                 and inserting in lieu thereof the following:

                     " (b) Profitability. A minimum Net Income, on a trailing
                 six (6) month basis, of (i) not less than a maximum loss
                 greater than ($1,000,000), for each monthly period beginning on
                 the Effective Date through and including August 31, 2008; and
                 (ii) not less than $1.00, for each monthly period beginning
                 September 1, 2008 and thereafter."

             3   The Loan Agreement shall be amended by inserting the following
                 new definitions to appear alphabetically in Section 13.1
                 thereof:

                     " "Second Loan Modification Agreement" is that certain
                 Second Loan Modification Agreement entered into by and between
                 the Bank and the Borrower, dated as of the Second Loan
                 Modification Effective Date.

                     "Second Loan Modification Date" is the date indicated on
                 the signature page to the Second Loan Modification Agreement."

         B.  Waivers.

             1   Bank hereby waives Borrower's existing defaults under the Loan
                 Agreement by virtue of Borrower's failure to comply with the
                 Profitability financial covenant set forth in Section 6.7(b)
                 (as required prior to this Loan Modification Agreement) thereof
                 as of the month ended March 31, 2008, and the anticipated
                 failure of Borrower to comply with such covenant as of the
                 month ended April 30, 2008 (provided, however, that minimum Net
                 Income, on a trailing six (6) month basis for such period ended
                 April 30, 2008 shall not exceed a maximum loss in excess of
                 ($1,500,000)). Borrower acknowledges and agrees that there is
                 no remaining availability under the Equipment Line. Bank's
                 waiver of Borrower's compliance with said covenants shall apply
                 only to the foregoing specific periods.

4.       FEES. Borrower shall pay to Bank a modification fee equal to Twelve
Thousand One Hundred Fifty Three Dollars ($12,153), which fee shall be due on
the date hereof and shall be deemed fully earned as of the date hereof. Borrower
shall also reimburse Bank for all reasonable legal fees and expenses incurred in
connection with this amendment to the Existing Loan Documents.

5.       CONSISTENT CHANGES. The Existing Loan Documents are hereby amended
wherever necessary to reflect the changes described above.

6.       RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and
reaffirms all terms and conditions of all security or other collateral granted
to the Bank and confirms that the indebtedness secured thereby includes, without
limitation, the Obligations.

7.       NO DEFENSES OF BORROWER. Borrower hereby acknowledges and agrees that
Borrower has no offsets, defenses, claims, or counterclaims against Bank with
respect to the Obligations, or otherwise, and that if Borrower now has, or ever
did have, any offsets, defenses, claims, or counterclaims against Bank, whether
known or unknown, at law or in equity, all of them are hereby expressly WAIVED
and Borrower hereby RELEASES Bank from any liability thereunder.

8.       CONTINUING VALIDITY. Borrower understands and agrees that in modifying
the existing Obligations, Bank is relying upon Borrower's representations,
warranties, and agreements, as set forth in the Existing Loan Documents. Except
as expressly modified pursuant to this Loan Modification Agreement, the terms of
the Existing Loan Documents remain unchanged and in full force and effect.
Bank's agreement to modifications to the existing Obligations pursuant to this
Loan Modification Agreement in no way shall obligate Bank to make any future
modifications to the Obligations. Nothing in this Loan Modification Agreement
shall constitute a satisfaction of the

                                        2
<PAGE>
Obligations. It is the intention of Bank and Borrower to retain as liable
parties all makers of Existing Loan Documents, unless the party is expressly
released by Bank in writing. No maker will be released by virtue of this Loan
Modification Agreement.

9.       COUNTERSIGNATURE. This Loan Modification Agreement shall become
effective only when it shall have been executed by Borrower and Bank.

         This Loan Modification Agreement is executed as a sealed instrument
under the laws of the Commonwealth of Massachusetts as of the date first written
above.

BORROWER:

SPIRE CORPORATION

By  /s/ Roger G. Little                           By /s/ Christian Dufresne
    ---------------------------                      ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE SOLAR, INC.

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE BIOMEDICAL, INC.

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE SEMICONDUCTOR, LLC f/k/a BANDWITH
SEMICONDUCTOR, LLC
By: Spire Corporation, a Massachusetts
corporation, its sole Member and Manager

By  /s/ Roger G. Little                           By /s/ Christian Dufresne
    ---------------------------                      ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

BANK:

SILICON VALLEY BANK

By  /s/ Karen Dunn
    ---------------------------
Name: Karen Dunn
Title: Relationship Manager

Second Loan Modification Effective Date: May 13, 2008

                                        3EXHIBIT 10(ad)
                                                                  --------------

                  WAIVER AND FIRST LOAN MODIFICATION AGREEMENT

         This Waiver and First Loan Modification Agreement (this "Loan
Modification Agreement") is entered into as of the First Loan Modification
Effective Date by and between SILICON VALLEY BANK, a California corporation,
with its principal place of business at 3003 Tasman Drive, Santa Clara,
California 95054 and with a loan production office located at One Newton
Executive Park, Suite 200, 2221 Washington Street, Newton, Massachusetts 02462
("Bank") and SPIRE CORPORATION, a Massachusetts corporation, SPIRE SOLAR, INC.,
a Massachusetts corporation, SPIRE BIOMEDICAL, INC., a Massachusetts
corporation, each with offices located at One Patriots Park, Bedford,
Massachusetts 01730, and SPIRE SEMICONDUCTOR, LLC, a Delaware limited liability
company (formerly known as Bandwidth Semiconductor, LLC), with offices at 25
Sagamore Park Road, Hudson, NH 03051 (jointly and severally, individually and
collectively, the "Borrower").

1.       DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other
indebtedness and obligations which may be owing by Borrower to Bank, Borrower is
indebted to Bank pursuant to a loan arrangement dated as of March 31, 2008,
evidenced by, among other documents, a certain Loan and Security Agreement dated
as of March 31, 2008, (as amended, the "Loan Agreement"). Capitalized terms used
but not otherwise defined herein shall have the same meaning as in the Loan
Agreement.

2.       DESCRIPTION OF COLLATERAL. Repayment of the Obligations is secured by
the Collateral as described in the Loan Agreement (together with any other
collateral security granted to Bank, the "Security Documents").

Hereinafter, the Security Documents, together with all other documents
evidencing or securing the Obligations shall (except this Loan Modification
Agreement) be referred to as the "Existing Loan Documents".

3.       DESCRIPTION OF CHANGE IN TERMS.

         A.  Modifications to Loan Agreement.

             1   The Loan Agreement shall be amended by deleting the following
                 text appearing as subsection (a) of Section 2.3 thereof,
                 entitled "Interest Rate; Advances":

                 "   (a) Interest Rate; Advances. Subject to Section 2.3(b), the
                 principal amount outstanding under the Revolving Line shall
                 accrue interest at a per annum rate equal to the Prime Rate
                 plus one percent (1.00%)."

                 and inserting in lieu thereof the following:

                 "   (a) Interest Rate; Advances. Subject to Section 2.3(b), the
                 principal amount outstanding under the Revolving Line shall
                 accrue interest at a per annum rate equal to the Prime Rate
                 plus one and three quarters of one percent (1.75%); provided,
                 however, that beginning the month following the date that
                 Borrower provides evidence satisfactory to Bank, in its sole
                 discretion, that Borrower has maintained Net Income, based on
                 the trailing six (6) months ending on the date of measurement,
                 for three (3) consecutive fiscal quarters of at least One
                 Million Dollars ($1,000,000), then, subject to Section 2.3(b),
                 the principal amount outstanding under the Revolving Line shall
                 accrue interest at a per annum rate equal to the Prime Rate
                 plus one percent (1.00%)."

             2   The Loan Agreement shall be amended by deleting the following
                 text appearing as subsection (a)(ii) of Section 6.8 thereof,
                 entitled "Operating Accounts":

                 "   (ii) Borrower is permitted to maintain Spire Corporation's
                 account nos. 113759-490-7 and 1165-123685 and Spire
                 Semiconductor, LLC's account nos. 330400-908-9 and 330918-730-8
                 (collectively, the "Citizens' Accounts", provided that (A) on a
                 weekly basis, on the last Business Day of each week, and in any
                 event when the aggregate balance in the Citizens' Accounts
                 exceeds One Hundred Thousand Dollars ($100,000) , transfer such
                 amounts in the Citizens' Accounts to Bank for deposit into

                                        1
<PAGE>
                 such account as Bank shall specify; and (B) within thirty (30)
                 Business Days' after the Effective Date, Borrower shall have
                 either closed the Citizen's Accounts or shall have entered into
                 a blocked account agreement with RBS Citizens, N.A. in favor of
                 Bank, in form and substance reasonably acceptable to Bank. In
                 any event, Borrower shall promptly notify its Account Debtors
                 to remit payments to Borrowers' Collateral Account maintained
                 at Bank."

                 and inserting in lieu thereof the following:

                 "   (ii) Borrower is permitted to maintain Spire Corporation's
                 account nos. 113759-490-7 and 1165-123685 and Spire
                 Semiconductor, LLC's account nos. 330400-908-9 and 330918-730-8
                 (collectively, the "Citizens' Accounts", provided that (A) on a
                 weekly basis, on the last Business Day of each week, and in any
                 event when the aggregate balance in the Citizens' Accounts
                 exceeds One Hundred Thousand Dollars ($100,000) , transfer such
                 amounts in the Citizens' Accounts to Bank for deposit into such
                 account as Bank shall specify; (B) within thirty (30) days'
                 after the First Loan Modification Effective Date, Borrower
                 shall have entered into a blocked account agreement with RBS
                 Citizens, N.A. in favor of Bank, in form and substance
                 reasonably acceptable to Bank; and (C) within one hundred
                 twenty (120) days' after the First Loan Modification Effective
                 Date, Borrower shall have closed the Citizen's Accounts and
                 shall have transferred all funds held in such Citizens Accounts
                 to an account maintained by Bank or Bank's Affiliates. In any
                 event, Borrower shall promptly notify its Account Debtors to
                 remit payments to Borrowers' Collateral Account maintained at
                 Bank."

             3   The Loan Agreement shall be amended by deleting the following
                 text appearing as Section 6.9(b) thereof, entitled
                 "Profitability":

                 "   (b) Profitability. A minimum Net Income, on a trailing six
                 (6) month basis, of (i) not less than ($1,000,000), for each
                 monthly period beginning on the Effective Date through and
                 including May 31, 2008; and (ii) not less than $1.00, for each
                 monthly period beginning June 1, 2008 and thereafter." and
                 inserting in lieu thereof the following:

                 "   (b) Profitability. A minimum Net Income, on a trailing six
                 (6) month basis, of (i) not less than a maximum loss greater
                 than ($1,000,000), for each monthly period beginning on the
                 Effective Date through and including August 31, 2008; and (ii)
                 not less than $1.00, for each monthly period beginning
                 September 1, 2008 and thereafter."

             4   The Loan Agreement shall be amended by inserting the following
                 new definitions to appear alphabetically in Section 13.1
                 thereof:

                 "  "Equipment Line Reserve" is, until such time as Borrower has
                 achieved Net Income, based on the trailing six (6) months
                 ending on the date of measurement, of not less than One Million
                 Dollars ($1,000,000) for two (2) consecutive fiscal quarters,
                 an amount equal to one hundred percent (100%) of the aggregate
                 amount of outstanding Equipment Advances. Thereafter, until
                 such time as Borrower has achieved Net Income, based on the
                 trailing six (6) months ending on the date of measurement, of
                 not less than One Million Dollars ($1,000,000) for three (3)
                 consecutive fiscal quarters, an amount equal to fifty percent
                 (50%) of the aggregate amount of outstanding Equipment
                 Advances. Thereafter, the Equipment Line Reserve shall be zero
                 ($0.00).

                     "First Loan Modification Agreement" is that certain Waiver
                 and First Loan Modification Agreement entered into by and
                 between the Bank and the Borrower, dated as of the First Loan
                 Modification Effective Date.

                     "First Loan Modification Date" is the date indicated on the
                 signature page to the First Loan Modification Agreement."

                                       2
<PAGE>
             5   The Loan Agreement shall be amended by deleting the following
                 definition appearing in Section 13.1 thereof:

                 "  "Availability Amount" is (a) the lesser of (i) the Revolving
                 Line or (ii) the amount available under the Borrowing Base
                 minus (b) the amount of all outstanding Letters of Credit
                 (including drawn but unreimbursed Letters of Credit) plus an
                 amount equal to the Letter of Credit Reserve, minus (c) the FX
                 Reserve, minus (d) any amounts used for Cash Management
                 Services, and minus (e) the outstanding principal balance of
                 any Advances.

                     "Eligible Inventory" means, at any time, the aggregate of
                 Borrower's Inventory (valued at the lower of cost or wholesale
                 fair market value) that (a) consists of (i) raw materials, (ii)
                 work-in-progress Inventory, to the extent such work-in-progress
                 Inventory is the subject of a purchase order, backed by a
                 letter of credit acceptable to Bank, and (iii) finished goods,
                 in good, new, and salable condition, which is not perishable,
                 returned, consigned, obsolete, not sellable, damaged, or
                 defective, and is not comprised of demonstrative or custom
                 inventory, packaging or shipping materials, or supplies; (b)
                 meets all applicable governmental standards; (c) has been
                 manufactured in compliance with the Fair Labor Standards Act;
                 (d) is not subject to any Liens, except the first priority
                 Liens granted or in favor of Bank under this Agreement or any
                 of the other Loan Documents; (e) is located at Borrower's
                 principal place of business (or any location permitted under
                 Section 7.2), and, in the case of Inventory in the possession
                 of third parties, Bank has received written acknowledgment from
                 such third parties of Borrower's ownership of such goods, in
                 form and substance satisfactory to Bank; and (f) is otherwise
                 acceptable to Bank in its good faith business judgment."

                 and inserting in lieu thereof the following:

                 "  "Availability Amount" is (a) the lesser of (i) the Revolving
                 Line or (ii) the amount available under the Borrowing Base
                 minus the Equipment Line Reserve minus (b) the amount of all
                 outstanding Letters of Credit (including drawn but unreimbursed
                 Letters of Credit) plus an amount equal to the Letter of Credit
                 Reserve, minus (c) the FX Reserve, minus (d) any amounts used
                 for Cash Management Services, and minus (e) the outstanding
                 principal balance of any Advances.

                     "Eligible Inventory" means, at any time, the aggregate of
                 Borrower's Inventory (excluding Inventory owned by Spire
                 Semiconductor, LLC, unless approved by Bank in writing, in its
                 sole discretion) valued at the lower of cost or wholesale fair
                 market value that (a) consists of (i) raw materials, (ii)
                 work-in-progress Inventory, to the extent such work-in-progress
                 Inventory is the subject of a purchase order, backed by a
                 letter of credit acceptable to Bank, and (iii) finished goods,
                 in good, new, and salable condition, which is not perishable,
                 returned, consigned, obsolete, not sellable, damaged, or
                 defective, and is not comprised of demonstrative or custom
                 inventory, packaging or shipping materials, or supplies; (b)
                 meets all applicable governmental standards; (c) has been
                 manufactured in compliance with the Fair Labor Standards Act;
                 (d) is not subject to any Liens, except the first priority
                 Liens granted or in favor of Bank under this Agreement or any
                 of the other Loan Documents; (e) is located at Borrower's
                 principal place of business (or any location permitted under
                 Section 7.2), and, in the case of Inventory in the possession
                 of third parties, Bank has received written acknowledgment from
                 such third parties of Borrower's ownership of such goods, in
                 form and substance satisfactory to Bank; and (f) is otherwise
                 acceptable to Bank in its good faith business judgment."

             6   The Loan Agreement shall be amended by deleting the following
                 clause (s) and clause (t) of the definition of "Eligible
                 Accounts" appearing in Section 13.1 thereof:

                 " (s) Accounts in which the Account Debtor disputes liability
                 or makes any claim (but only up to the disputed or claimed
                 amount), or if the Account Debtor is subject to an Insolvency
                 Proceeding, or becomes insolvent, or goes out of business; and

                                        3
<PAGE>
                 (t) Accounts for which Bank in its good faith business judgment
                 determines collection to be doubtful."

                 and inserting in lieu thereof the following:

                 "(s) Accounts in which the Account Debtor disputes liability or
                 makes any claim (but only up to the disputed or claimed
                 amount), or if the Account Debtor is subject to an Insolvency
                 Proceeding, or becomes insolvent, or goes out of business;

                 (t) Accounts for which Bank in its good faith business judgment
                 determines collection to be doubtful; and

                 (u) without the prior written approval of Bank, in its sole
                 discretion, Accounts of Spire Semiconductor, LLC."

             7   The Borrowing Base Certificate appearing as Exhibit B to the
                 Loan Agreement is hereby replaced with the Borrowing Base
                 Certificate attached as Exhibit A hereto.

             8   The Compliance Certificate appearing as Exhibit C to the Loan
                 Agreement is hereby replaced with the Compliance Certificate
                 attached as Exhibit B hereto.

         B.  Waivers.

             1   Bank hereby waives Borrower's existing defaults under the Loan
                 Agreement by virtue of Borrower's failure to comply with the
                 Profitability financial covenant set forth in Section 6.9(b)
                 (as required prior to this Loan Modification Agreement) thereof
                 as of the month ended March 31, 2008, and the anticipated
                 failure of Borrower to comply with such covenant as of the
                 month ended April 30, 2008 (provided, however, that minimum Net
                 Income, on a trailing six (6) month basis for such period ended
                 April 30, 2008 shall not exceed a maximum loss in excess of
                 ($1,500,000)). Bank's waiver of Borrower's compliance with said
                 covenants shall apply only to the foregoing specific periods.

4.       FEES. Borrower shall pay to Bank a modification fee equal to Twenty
Five Thousand Dollars ($25,000.00), which fee shall be due on the date hereof
and shall be deemed fully earned as of the date hereof. Borrower shall also
reimburse Bank for all legal fees and expenses incurred in connection with this
amendment to the Existing Loan Documents.

5.       RATIFICATION OF PERFECTION CERTIFICATE. Borrower hereby ratifies,
confirms and reaffirms, all and singular, the terms and disclosures contained in
a certain Perfection Certificate dated as of March 31, 2008 between Borrower and
Bank, and acknowledges, confirms and agrees the disclosures Borrower provided to
Bank in the Perfection Certificate, as amended, has not changed.

6.       AUTHORIZATION TO FILE. Borrower hereby authorizes Bank to file UCC
financing statements without notice to Borrower, with all appropriate
jurisdictions, as Bank deems appropriate, in order to further perfect or protect
Bank's interest in the Collateral, including a notice that any disposition of
the Collateral, by either the Borrower or any other Person, shall be deemed to
violate the rights of the Bank under the Code.

7.       CONSISTENT CHANGES. The Existing Loan Documents are hereby amended
wherever necessary to reflect the changes described above.

8.       RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and
reaffirms all terms and conditions of all security or other collateral granted
to the Bank, and confirms that the indebtedness secured thereby includes,
without limitation, the Obligations.

9.       NO DEFENSES OF BORROWER. Borrower hereby acknowledges and agrees that,
as of the date of this Loan Modification Agreement, Borrower has no offsets,
defenses, claims, or counterclaims against Bank with respect to the Obligations,
or otherwise, and that if Borrower now has, or ever did have, any offsets,
defenses, claims, or counterclaims against Bank, whether known or unknown, at
law or in equity, all of them are hereby expressly WAIVED and Borrower hereby
RELEASES Bank from any liability thereunder.

                                        4
<PAGE>
10.      CONTINUING VALIDITY. Borrower understands and agrees that in modifying
the existing Obligations, Bank is relying upon Borrower's representations,
warranties, and agreements, as set forth in the Existing Loan Documents. Except
as expressly modified pursuant to this Loan Modification Agreement, the terms of
the Existing Loan Documents remain unchanged and in full force and effect.
Bank's agreement to modifications to the existing Obligations pursuant to this
Loan Modification Agreement in no way shall obligate Bank to make any future
modifications to the Obligations. Nothing in this Loan Modification Agreement
shall constitute a satisfaction of the Obligations. It is the intention of Bank
and Borrower to retain as liable parties all makers of Existing Loan Documents,
unless the party is expressly released by Bank in writing. No maker will be
released by virtue of this Loan Modification Agreement.

11.      COUNTERSIGNATURE. This Loan Modification Agreement shall become
effective only when it shall have been executed by Borrower and Bank.

         IN WITNESS WHEREOF, the parties hereto have caused this Loan
Modification Agreement to be executed as a sealed instrument under the laws of
the Commonwealth of Massachusetts as of the Effective Date.

BORROWER:

SPIRE CORPORATION

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE SOLAR, INC.

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE BIOMEDICAL, INC.

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

SPIRE SEMICONDUCTOR, LLC f/k/a BANDWITH
SEMICONDUCTOR, LLC
By: Spire Corporation, a Massachusetts
corporation, its sole Member and Manager

By /s/ Roger G. Little                            By /s/ Christian Dufresne
   ---------------------------                       ---------------------------
Name: Roger G. Little                             Name: Christian Dufresne
Title: Chief Executive Officer                    Title: Chief Financial Officer

BANK:

SILICON VALLEY BANK

By /s/ Karen Dunn
   ---------------------------
Name: Karen Dunn
Title: Relationship Manager

First Loan Modification Effective Date: May 13, 2008

                                        5

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