EXHIBIT 99

                                     [LOGO]

July 25, 2003

Dear Shareholder:

Enterprise  Bancorp,  Inc.  reported  net income of $2.7  million for the second
quarter  of 2003  compared  to  $1.5  million  for  the  same  period  in  2002.
Year-to-date  net income  amounted to $3.2 million  compared to $3.0 million for
2002. As reported in the first quarter of this year,  the bank recorded a charge
to  earnings  of $1.9  million  to  reserve  for tax  liabilities  arising  from
legislative  changes in  Massachusetts  tax laws,  enacted in March,  which were
retroactive to 1999. Also, as previously  reported,  on June 23, 2003 Enterprise
Bank, along with approximately  sixty-five other  Massachusetts  banks,  entered
into a final settlement  agreement with the Massachusetts  Department of Revenue
regarding the disputed tax assessments.  Under the terms of the settlement,  the
one-time tax impact to the bank is approximately $1.1 million. Consequently, the
current quarter includes a credit to earnings of approximately  $825 thousand to
adjust the reserve  recorded in the first  quarter.  Excluding the $825 thousand
credit  recorded  in June,  net income  for the  second  quarter of 2003 is $1.9
million, an increase of 23% over 2002. Excluding the net one-time charge of $1.1
million,  net income for the six months ended June 30, 2003 is $4.3 million,  an
increase of 42% over 2002.

Total assets,  investment assets under  management,  and mortgage loans serviced
for others amounted to $1.1 billion at June 30, 2003, an increase of 9% over the
prior year. Individually,  the bank reported total assets of $751 million, loans
of $445 million,  deposits plus repurchase agreements amounting to $680 million,
and investment assets under management  totaling $353 million, at June 30, 2003,
increases of 11%, 12%, 10%, and 7%, respectively, versus one year ago.

Growth,  as  described  above,  requires  periodic  modifications  to our senior
management structure. As reported in our December 30, 2002 quarterly,  Executive
Vice  President  John P. Clancy  assumed new and  expanded  responsibilities  as
President of Enterprise  Bancorp,  Inc. Jack's previous  responsibility as Chief
Financial  Officer was  transferred to James A. Marcotte in May 2003. The former
Chief Financial Officer of The DeWolfe Companies,  Inc., the largest residential
real estate  brokerage  and financial  services firm in New England,  Jim brings
twenty-four years of banking and financial services  expertise to Enterprise.  A
certified public accountant,  Jim is a native of Tewksbury and a graduate of the
University of Massachusetts at Amherst.

In spite of the  lagging  economy,  loan  growth  remained  strong.  Our lenders
aggressively  seek solid lending  opportunities  for the bank. Steady growth was
seen in both our  commercial  mortgage  and  construction  mortgage  portfolios.
Enterprise's  SBA lending  portfolio  saw continued  increases,  and we recently
introduced  a new  "express  loan" line of credit to our product  offerings.  In
addition,  our Mortgage  Center  reported a high volume of residential  mortgage
activity,  as well as a brisk  refinancing and home equity market due in part to
the favorable rate environment.

Our  newly-constructed  branch  office  opened  at 420  John  Fitch  Highway  in
Fitchburg  on  May  5,  2003.  We are  extremely  pleased  about  the  warm  and
enthusiastic  welcome we received  from the Fitchburg  community.  An aggressive
customer-call effort and targeted newspaper and direct mail campaign,  helped us
officially  launch our new branch  office.  Customer  reaction to our branch has
been  extremely  positive.  Business has been steady and Branch  Manager  Cheryl
Gaudreau and her staff report that the  Fitchburg  office has exceeded  business
projections  for their first two months in  operation.  With its  highly-visible
location on Fitchburg's  main business  corridor,  we anticipate  that Fitchburg
will be a very successful addition to our branch network. Our customers from the
North Central region are now able to do business at two  convenient  locations -
Fitchburg and Leominster.

Enterprise  Bank  directors  and  officers  continue  to play a lead role in the
communities we serve. During the second quarter,  five members of the Enterprise
family were recognized for outstanding community involvement:  Dr. Carole Cowan,
director, was the first receipient of the "Legacy of Commitment" award presented
by the United Way of Merimack  Valley;  Director John Clementi was recognized at
commencement   ceremonies  at  Fitchburg  State   College's  100th   anniversary
celebration where he was presented an honorary degree; Director Kathleen Bradley
was  one  of  three  individuals  receiving  honorary  degrees  at  commencement
exercises  at  Middlesex  Community  College.  This  was the  first  time in the
school's history that Middlesex has presented  honorary  degrees;  With over 500
business and community  leaders in attendance,  Director Nancy Donahue,  and her
husband  Richard,  were presented with the  prestigious  "Tsongas  Award" by the
Merrimack  Repertory  Theatre at a  black-tie  gala held at the Lowell  Memorial
Auditorium on June 21. This award represented twenty-five years of dedication by
the  Donahues to the arts and to the MRT; and Senior Vice  President  Mary Ellen
Fitzpatrick  was also  recognized for her community  leadership and  involvement
when she received the  "Celebration  of Today's Woman" award  presented by Girls
Incorporated of Greater Lowell. Mary Ellen joins a group of ten women, including
Directors Donahue and Cowan, who have been honored with this annual award during
the  past  decade.  The  entire  Enterprise  Bank  family  takes  pride  in  the
accomplishments  of our directors and  employees and  congraulate  each on their
special recognition.

We are  grateful  to the  shareholders  who joined us for  Enterprise  Bancorp's
annual meeting on May 6. It was a pleasure to have had the  opportunity to speak
with you in  person  about  the  success  of our  bank,  and the  wisdom of your
investment in Enterprise Bancorp. Inc.





Sincerely,



/s/ George L. Duncan       /s/ Richard W. Main          /s/ John P. Clancy, Jr.
- --------------------       -------------------          -----------------------
George L. Duncan           Richard W. Main              John P. Clancy, Jr.
Chairman/                  President/Chief Operating/   EVP/Enterprise Bank
Chief Executive Officer    Chief Lending Officer        and President of
of Enterprise Bank and     of Enterprise Bank           Enterprise Bancorp, Inc.
Enterprise Bancorp, Inc.






                    Enterprise Bancorp, Inc. and Subsidiaries

                              STATEMENTS OF INCOME



                                                                      (unaudited)                    (unaudited)
                                                               Three Months Ended June 30,     Six Months Ended June 30,
                                                            -------------------------------  -----------------------------
                                                                 2003            2002            2003            2002
                                                            --------------   --------------  --------------  -------------
                                                                                                 
INTEREST INCOME
    Interest and fees on loans                               $  7,031,103    $  6,979,197    $ 13,920,825    $ 13,860,161
    Interest on investment securities                           2,056,734       2,649,398       4,558,330       5,231,299
    Interest on federal funds sold                                 63,595          29,711          87,615          66,406
                                                             ------------    ------------    ------------    ------------
               Total interest income                            9,151,432       9,658,306      18,566,770      19,157,866
                                                             ------------    ------------    ------------    ------------

INTEREST EXPENSE
    Interest on deposits                                        1,718,854       2,446,339       3,571,261       4,952,426
    Interest on repurchase agreements                               3,142           5,706           6,068          10,172
    Interest on Federal Home Loan Bank borrowings                  23,036          16,219          45,635          23,203
                                                             ------------    ------------    ------------    ------------
               Total interest expense                           1,745,032       2,468,264       3,622,964       4,985,801
                                                             ------------    ------------    ------------    ------------

NET INTEREST INCOME                                             7,406,400       7,190,042      14,943,806      14,172,065

    Provision for loan losses                                     300,000         380,000         600,000         770,000
                                                             ------------    ------------    ------------    ------------
       Net interest income after provision for loan losses      7,106,400       6,810,042      14,343,806      13,402,065
                                                             ------------    ------------    ------------    ------------

       Operating expenses                                      (5,402,124)     (5,793,794)    (10,874,918)    (11,521,127)
       Depreciation                                              (633,850)       (649,893)     (1,296,815)     (1,227,538)
       Amortization of intangible assets                          (33,192)        (33,192)        (66,384)        (66,384)
       Non-interest income                                      1,680,695       1,299,173       3,261,432       2,656,471
       Net gains on sales of investment securities                239,141         448,979       1,554,895         865,006
                                                             ------------    ------------    ------------    ------------
       Income before provision for income taxes                 2,957,070       2,081,315       6,922,016       4,108,493
       Provision for income taxes                                 259,558         556,647       3,720,430       1,095,396
                                                             ------------    ------------    ------------    ------------

NET INCOME                                                   $  2,697,512    $  1,524,668    $  3,201,586    $  3,013,097
                                                             ============    ============    ============    ============

EARNINGS PER SHARE
Basic earnings per common share                              $       0.76    $       0.44    $       0.90    $       0.87
                                                             ============    ============    ============    ============

Diluted earnings per common share                            $       0.73    $       0.42    $       0.87    $       0.84
                                                             ============    ============    ============    ============

Dividend per common share *                                  $       0.38    $       0.33    $       0.38    $       0.33
                                                             ============    ============    ============    ============

Basic weighted average common shares outstanding **             3,544,125       3,469,705       3,538,836       3,465,988
                                                             ============    ============    ============    ============

Diluted weighted average common shares outstanding              3,678,677       3,590,515       3,669,796       3,584,469
                                                             ============    ============    ============    ============



*    Annual  dividends  are  generally  declared  in the second  quarter of each
     fiscal year.

**   Weighted  average  common  shares  outstanding  have  increased  due to the
     exercise of employee stock options and  reinvestment  of dividends from the
     dividend reinvestment plan.





                    Enterprise Bancorp, Inc. and Subsidiaries

                                 BALANCE SHEETS





                                                         (unaudited)                            (unaudited)
                                                                            December 31,
                                                        June 30, 2003           2002           June 30, 2002
                                                     ------------------   -----------------  ----------------
                                                                                    
ASSETS
    Cash and due from banks                            $    41,070,108    $    45,778,048    $    33,845,025
    Federal funds sold                                      66,065,000               --           24,500,000
    Investment securities                                  178,612,572        239,096,327        202,605,244
    Loans                                                  444,584,295        414,123,485        396,454,606
        Allowance for loan losses                          (10,047,877)        (9,371,057)        (8,900,468)
                                                       ---------------    ---------------    ---------------
        Net loans                                          434,536,418        404,752,428        387,554,138
                                                       ---------------    ---------------    ---------------
    Bank premises and equipment                             13,153,483         13,143,900         13,341,109
    Intangible assets                                        6,596,508          6,662,892          6,729,277
    Other assets                                            11,001,869          9,262,084          9,535,425
                                                       ---------------    ---------------    ---------------

TOTAL ASSETS                                           $   751,035,958    $   718,695,679    $   678,110,218
                                                       ===============    ===============    ===============

LIABILITIES, TRUST PREFERRED SECURITIES
   AND STOCKHOLDERS' EQUITY
    Deposits                                           $   679,098,274    $   638,031,838    $   613,224,242
    Repurchase agreements                                      952,965            762,737          2,982,578
    Federal Home Loan Bank borrowings                        5,470,000         16,470,000            470,000
    Other liabilities                                        3,376,280          2,850,774          4,703,757
                                                       ---------------    ---------------    ---------------
    Total liabilities                                      688,897,519        658,115,349        621,380,577
                                                       ---------------    ---------------    ---------------

    Trust preferred securities                              10,500,000         10,500,000         10,500,000

    Stockholders' equity                                    48,563,183         45,612,399         42,169,035
    Net unrealized appreciation on
         investment securities, net of taxes                 3,075,256          4,467,931          4,060,606
                                                       ---------------    ---------------    ---------------
    Total stockholders' equity                              51,638,439         50,080,330         46,229,641
                                                       ---------------    ---------------    ---------------

TOTAL LIABILITIES, TRUST PREFERRED
   SECURITIES AND STOCKHOLDERS' EQUITY                 $   751,035,958    $   718,695,679    $   678,110,218
                                                       ===============    ===============    ===============


    Investment assets under management                 $   352,815,990    $   314,095,210    $   328,872,586
                                                       ===============    ===============    ===============

    Mortgage loans serviced for others                 $    16,556,486    $    16,860,951    $    20,063,574
                                                       ===============    ===============    ===============

    Total assets, investment assets under management
      and mortgage loans serviced for others           $ 1,120,408,434    $ 1,049,651,840    $ 1,027,046,378
                                                       ===============    ===============    ===============