Exhibit 10.1
                                                                    ------------

                        AMENDMENT TO WARRANT CERTIFICATE

         This Amendment  ("Amendment") to Warrant Certificate ("Warrant") issued
by MicroFinancial  Incorporated (the "Company") to Stonebridge  Associates,  LLC
("Stonebridge")  is made and entered into as of November 30, 2004 by and between
the Company and  Stonebridge.  Capitalized  terms used herein and not  otherwise
defined herein shall have the meaning assigned to such terms in the Warrant.

                                    RECITALS

         WHEREAS, the Company issued the Warrant to Stonebridge on September 29,
2004; and;


         WHEREAS,  the  Company and  Stonebridge  desire to amend the Warrant to
provide for net issue election.

         NOW  THEREFORE,  for good and valuable  consideration,  the receipt and
sufficiency of which is hereby acknowledged,  the Company and Stonebridge hereby
agree as follows:

1.  Amendment to Section 1.2.  Section 1.2 of the Warrant,  is hereby amended in
its entirety to provide as follows:


         "1.2  Payment;  Net Issue  Election.  Payment in an amount equal to the
         product of (a) the number of shares of Common Stock  designated  in the
         Subscription, times (b) the Exercise Price shall be due to the Company,
         in cash or by certified or official  bank check  payable to the Company
         within   five  (5)   Business   Days   after  the  date  of   exercise.
         Alternatively,  the Holder  hereof may elect to  receive,  without  the
         payment  by such  Holder  of any  additional  consideration,  shares of
         Common Stock equal to the value of this  Warrant or any portion  hereof
         by the  surrender of this Warrant or such portion to the Company,  with
         the net issue  subscription  form duly executed by such Holder,  at the
         office of the  Company.  Thereupon,  the  Company  shall  issue to such
         Holder  such  number of fully paid and  nonassessable  shares of Common
         Stock as is computed using the following formula:

                  X=   Y(A-B)
                       ------
                         A

         Where X = the number of shares to be issued to such Holder  pursuant to
         a net issue exercise.

         Where Y = the number of shares  covered  by this  Warrant in respect of
         which the net issue election is made.

         Where A = the Fair  Market  Value  (as  defined  below) of one share of
         Common Stock at the time the net issue election is made.

         Where B = the  Exercise  Price in effect under this Warrant at the time
the net issue election is made.


         Where "Fair Market  Value"  means,  with respect to one share of Common
         Stock,  the average of the daily  closing  prices for a share of Common
         Stock on the five (5) consecutive  trading days commencing  immediately
         before the date of determination of such fair market value. The closing
         price for each day shall be: (i) if the Common Stock shall be listed or
         admitted to trading on any national securities exchange, the average of
         the last reported sales prices on the specified days (or if there is no
         reported sale on any such trading date,  the average of the closing bid
         and asked prices on such trading date); (ii) if the Common Stock is not
         traded or admitted to trading on any national securities exchange,  the
         closing  price,  if reported,  or if the closing price is not reported,
         the average of the closing bid and asked prices, as reported by the New
         York Stock Exchange or similar source or, if no such source exists,  as
         furnished  by two members of the  National  Association  of  Securities
         Dealers,  Inc.,  selected  by the  Company  for  that  purpose,  on the
         specified dates; (iii) if the Common Stock is not traded or admitted to
         trading on any national securities exchange or New York Stock Exchange,
         the fair  market  value of such shares on such dates as  determined  in
         good faith by the Company's  Board of Directors;  (iv) if the date upon
         which  a  determination  of  the  price  is  made  is  the  date  of  a
         liquidation,  dissolution  or winding  up, or any event  deemed to be a
         liquidation,  dissolution  or  winding  up  pursuant  to the  Company's
         Articles of  Organization,  then all amounts to be payable per share to
         holders of the Common  Stock  pursuant  to the  Company's  Articles  of
         Organization in the event of such  liquidation,  dissolution or winding
         up,  plus all other  amounts to be payable  per share in respect of the
         Common  Stock  in  liquidation  under  the  Articles  of  Organization,
         assuming for the purposes of this clause (iv) that all of the shares of
         Common Stock then issuable upon exercise of all of the issued  warrants
         are  outstanding  on such date.  In the event that clause  (iii) in the
         immediately preceding sentence is applicable, the Board of Directors of
         the  Company  shall  promptly  respond  in writing to an inquiry by the
         Holder  hereof  as to the  fair  market  value of one  share of  Common
         Stock."

2. Net Issue  Election  Subscription  Form. The net issue  subscription  form is
attached hereto as Exhibit A.

3. No Other  Amendments.  Except for the amendments  expressly set forth in this
Amendment, the Warrant shall remain unchanged and in full force and effect.

4. Force and Effect.  This  Amendment has been executed as of the date first set
forth  above,  and shall be treated as an  amendment  to the  Warrant as of such
date.  This  Amendment  shall be subject  to all  applicable  provisions  of the
Warrant,  including  but not limited to,  notice  provisions  and  miscellaneous
provisions.


                          [NEXT PAGE IS SIGNATURE PAGE]






                               MICROFINANCIAL INCORPORATED


                                By: /s/ Richard F. Latour
                                    --------------------------------------------
                                    Richard F. Latour, President


                               STONEBRIDGE ASSOCIATES, LLC


                                By: /s/ Henry W. Barnard
                                    --------------------------------------------
                                    Henry W. Barnard, Managing Director







              [Signature Page to Amendment to Warrant Certificate]




                                                                       Exhibit A
                                                                       ---------

                      NET ISSUE ELECTION SUBSCRIPTION FORM

MICROFINANCIAL INCORPORATED
10-M Commerce Way
Woburn, Massachusetts 01801

Ladies and Gentlemen:

         The undersigned  hereby irrevocably elects to exchange all or a portion
of its Warrant for  __________  shares of Common Stock pursuant to the net issue
election provisions of the Warrant.

         You are instructed as follows:

         1. To issue certificate(s) for such Common Stock to:

         Name:
                      ----------------------------------------------------------
         Address:
                      ----------------------------------------------------------
         SSN/ Taxpayer I.D:
                           -----------------------------------------------------

         (Please  PRINT  name,  address  and  social  security   number/taxpayer
identification number in the spaces provided above).

         2. To deliver said certificate(s) to:

         Name:
                      ----------------------------------------------------------
         Address:
                      ----------------------------------------------------------


                                             Very truly yours,

                                             --------------------------------
                                             Name:
                                             Title:
                                             Address:

         Note: the above signature  should  correspond  exactly with the name on
         the  first  page of the  Warrant  or  with  the  name  of the  Assignee
         appearing on the assignment form attached to such Warrant.

         And if said number of shares  shall not be all the shares  exchangeable
or purchasable  under the within  Warrant,  a new Warrant is to be issued in the
name of the above for the balance remaining of the shares purchasable rounded up
to the next higher number of shares.