EXHIBIT 99
                                                                      ----------


                                     [LOGO]


October 28, 2003


Dear Shareholder:

Enterprise  Bancorp,  Inc.  reported  net income of $1.9  million  for the three
months ended  September 30, 2003 compared to $1.6 million for the same period in
2002.  Year-to-date net income amounted to $5.1 million compared to $4.6 million
for 2002.

As  reported   previously,   on  June  23,  2003  Enterprise  Bank,  along  with
approximately  sixty-five  other  Massachusetts  banks,  and  the  Massachusetts
Department of Revenue reached a final settlement  regarding disputed retroactive
tax  assessments  concerning  the bank's REIT  subsidiary,  for tax years 1999 -
2002. Under the terms of the settlement, the one-time tax impact to the bank was
approximately  $1.1 million.  Excluding the $1.1 million charge,  net income for
the nine months ended  September 30, 2003 was $6.2  million,  an increase of 33%
over 2002.

The bank  reported  total  assets of $758  million at  September  30,  2003,  an
increase of 7% from  September 30, 2002.  Total loans were $465  million,  a 15%
increase versus one year ago.  Deposits plus repurchase  agreements  amounted to
$679 million, up 5% over the prior year. In addition,  the company's  Investment
Management and Trust Group reported  investment  assets under management of $359
million, an increase of 11% versus one year ago. Total assets, investment assets
under  management,  and  mortgage  loans  serviced  for others  amounted to $1.1
billion at September 30, 2003, an increase of 8% over September 30, 2002.

We recorded steady growth in many sectors of our loan portfolio.  In particular,
impressive  increases  were  evident  in both our  commercial  real  estate  and
construction loan portfolios, with increases of 20% and 49% respectively, during
the past nine months.  We feel  strongly  that the depth and  experience  of our
commercial  lending team is  unequaled in our region.  Our lenders have over 400
years of combined  lending  experience,  coupled with the skill and knowledge to
work with growing  businesses in a  challenging  economic  climate.  SBA lending
continued  to be an  important  component  of our  loan  portfolio.  The  Boston
Business  Journal  (October 3, 2003) recently  reported that Enterprise Bank now
ranks as the 8th largest SBA lender in  Massachusetts,  (statistics  provided by
the Small Business Administration), up from #16 in similar rankings published in
the BBJ in May 2002.

Our 2003 business development campaigns are primarily team efforts utilizing our
lenders,  branch personnel and senior management.  Business development officers
call on  prospective  customers,  as well as on existing  customers of the bank,
which  gives us an  opportunity  to  showcase  the wide  range of  products  and
services Enterprise has to offer. On many occasions, cash-management specialists
and  trust/investment  personnel  join in  calling  efforts  to  facilitate  the
transfer of existing  relationships to our bank. During the past several months,
seminars have been conducted that targeted  various market  segments,  including
investment planning, start-up business strategies, and women's financial issues.
Such  forums  present  additional  opportunities  for the  bank to  attract  new
business relationships. We encourage all shareholders to contact us directly, or
any  Enterprise  Bank  officer,  should you be in a position to refer  potential
business to the bank. We greatly appreciate all shareholder referrals.

During 2003,  our  Investment  Management  and Trust Group has made  significant
strides in  implementing  a new and unique  approach  to  delivering  investment
management products and services to Enterprise clients. Our  highly-personalized
"manager of managers" program  incorporates a comprehensive group of competitive
mutual funds,  enhanced investment analytics,  access to world-class  investment
firms,  state-of-the-art  technology and customized,  easy-to-understand  client
reporting. Reaction from existing customers is extremely positive. We anticipate
that our  "manager  of  managers"  concept  will be a  tremendous  advantage  in
attracting prospective clients in the years ahead.

We are pleased to announce the addition of Vice  President/Relationship  Manager
Linda  MacLean to our  investment  team.  Linda brings 22 years of experience in
investment  management/brokerage  and commercial lending to her new position.  A
graduate of Wellesley College,  Linda has completed graduate business courses at
Harvard University, and she is currently a candidate for the Certified Financial
Planner  (CFP)  Certification.  Our  investment  management  team has three CFPs
readily  available to service our clients'  needs. We feel this is an impressive
number for a community bank in Enterprise's peer group.

Although we are continuing to closely  monitor  economic news, we are cautiously
optimistic  about  encouraging  trends  both  nationwide  and in  Massachusetts.
Headlines  announcing job creation  during third quarter and growth in the gross
domestic  product are  positive.  On a statewide  level,  the recent  statistics
published  by  the  Associated   Industries  of   Massachusetts   indicate  that
Massachusetts'  companies are seeing a more stable business climate,  and even a
slight  upturn in sales.  These  indicators  are truly welcome signs that we may
have turned the corner after more than two years of negative headlines. However,
local unemployment figures and manufacturing trends still give us some cause for
concern.

Enterprise Bank is soon to celebrate its 15th year  anniversary.  Throughout the
years,  we  have  repeatedly   expressed  our  deep  appreciation  to  you,  our
shareholders,  for your  loyalty.  The  importance of your support of Enterprise
Bank cannot be overstated. It has made all the difference,  and we are extremely
grateful.

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/Treasurer of
Chief Executive Officer    Chief Lending Officer         Enterprise Bank and
of Enterprise Bank and     of Enterprise Bank            President of Enterprise
Enterprise Bancorp, Inc.                                 Bancorp, Inc.





                    Enterprise Bancorp, Inc. and Subsidiaries

                              STATEMENTS OF INCOME
                                   (unaudited)



                                                             Three Months Ended               Nine Months Ended
                                                               September 30,                    September 30,
                                                      ------------------------------   ------------------------------
                                                           2003             2002           2003            2002
                                                      --------------  --------------   ------------    --------------
                                                                                            
INTEREST INCOME
    Interest and fees on loans                         $  7,065,675    $  7,078,535    $ 20,986,500    $ 20,938,697
    Interest on investment securities                     1,428,128       2,649,364       5,986,458       7,880,663
    Interest on federal funds sold                          154,832         104,265         242,447         170,671
                                                       ------------    ------------    ------------    ------------
               Total interest income                      8,648,635       9,832,164      27,215,405      28,990,031
                                                       ------------    ------------    ------------    ------------

INTEREST EXPENSE
    Interest on deposits                                  1,597,241       2,463,635       5,168,502       7,159,899
    Interest on repurchase agreements                         2,491          13,045           8,559         279,379
    Interest on Federal Home Loan Bank borrowings            24,129           7,596          69,764          30,799
    Interest on Trust Preferred Securities (1)              285,469            --           285,469            --
                                                       ------------    ------------    ------------    ------------
                Total interest expense                    1,909,330       2,484,276       5,532,294       7,470,077
                                                       ------------    ------------    ------------    ------------

NET INTEREST INCOME                                       6,739,305       7,347,888      21,683,111      21,519,954

    Provision for loan losses                               233,125         277,500         833,125       1,047,500
                                                       ------------    ------------    ------------    ------------
    Net interest income after provision for loan
    losses                                                6,506,180       7,070,388      20,849,986      20,472,454
                                                       ------------    ------------    ------------    ------------
                                                                                                       ------------
       Operating expenses (1)                            (4,977,152)     (5,950,614)    (15,852,070)    (17,471,746)
       Depreciation                                        (634,075)       (670,686)     (1,930,890)     (1,898,224)
       Amortization of intangible assets                    (33,193)        (33,193)        (99,577)        (99,577)
       Non-interest income                                1,657,602       1,312,998       4,919,034       3,969,472
       Net gains on sales of investment securities          314,235         476,469       1,869,130       1,341,475
                                                       ------------    ------------    ------------    ------------
       Income before provision for income taxes           2,833,597       2,205,362       9,755,613       6,313,854
       Provision for income taxes                           970,491         604,366       4,690,921       1,698,762
                                                       ------------    ------------    ------------    ------------

NET INCOME                                             $  1,863,106    $  1,600,996    $  5,064,692    $  4,615,092
                                                       ============    ============    ============    ============

EARNINGS PER SHARE
Basic earnings per common share                        $       0.52    $       0.45    $       1.42    $       1.32
                                                       ============    ============    ============    ============

Diluted earnings per common share                      $       0.50    $       0.44    $       1.37    $       1.28
                                                       ============    ============    ============    ============

Dividend per common share (2)                          $       0.38    $       0.33    $       0.38    $       0.33
                                                       ============    ============    ============    ============

Basic weighted average common shares outstanding (3)      3,591,374       3,522,603       3,556,541       3,485,067
                                                       ============    ============    ============    ============

Diluted weighted average common shares outstanding        3,746,889       3,637,165       3,695,686       3,602,242
                                                       ============    ============    ============    ============




(1)  On July 1,  2003,  the  company  began  classifying  it's  trust  preferred
     securities  expense as interest  expense,  as required by a new  accounting
     standard issued by the Financial  Accounting  Standards  Board (FASB),  the
     designated organization in the private sector for establishing standards of
     financial accounting and reporting.  Prior to the new FASB standard,  trust
     preferred  securities  expense was  recorded as a  component  of  operating
     expense.  Interest on trust  preferred  securities  recorded  in  operating
     expense was $570,937 for nine months ended  September 30, 2003 and $285,469
     and $856,406,  for the three and nine months  periods  ended  September 30,
     2002, respectively.

(2)  Annual  dividends  are  generally  declared  in the second  quarter of each
     fiscal year.

(3)  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)



                                                         September 30,       December 31,      September 30,
                                                             2003               2002               2002
                                                     -----------------   -----------------   ------------------
                                                                                    
ASSETS
    Cash and due from banks                            $    29,490,164    $    45,778,048    $    34,565,815
    Federal funds sold                                      67,500,000               --           29,159,620
    Investment securities                                  170,188,654        239,096,327        220,890,376
    Loans                                                  465,409,286        414,123,485        406,086,734
        Allowance for loan losses                          (10,285,206)        (9,371,057)        (9,276,461)
                                                       ---------------    ---------------    ---------------
        Net loans                                          455,124,080        404,752,428        396,810,273
                                                       ---------------    ---------------    ---------------
    Bank premises and equipment                             12,826,476         13,143,900         12,981,337
    Intangible assets                                        6,563,315          6,662,892          6,696,085
    Other assets                                            16,406,885          9,262,084          8,943,568
                                                       ---------------    ---------------    ---------------

TOTAL ASSETS                                           $   758,099,574    $   718,695,679    $   710,047,074
                                                       ===============    ===============    ===============

LIABILITIES, TRUST PREFERRED SECURITIES
   AND STOCKHOLDERS' EQUITY
    Deposits                                           $   678,363,934    $   638,031,838    $   643,966,925
    Repurchase agreements                                      935,785            762,737            797,447
    Federal Home Loan Bank borrowings                        5,470,000         16,470,000            470,000
    Trust preferred securities (1)                          10,500,000               --                 --
    Other liabilities                                       10,400,706          2,850,774          5,676,314
                                                       ---------------    ---------------    ---------------
    Total liabilities                                      705,670,425        658,115,349        650,910,686
                                                       ---------------    ---------------    ---------------

    Trust preferred securities (1)                                --           10,500,000         10,500,000

    Stockholders' equity                                    50,447,161         45,612,399         43,782,710
    Net unrealized appreciation on
         investment securities, net of taxes                 1,981,988          4,467,931          4,853,678
                                                       ---------------    ---------------    ---------------
    Total stockholders' equity                              52,429,149         50,080,330         48,636,388
                                                       ---------------    ---------------    ---------------

TOTAL LIABILITIES, TRUST PREFERRED
   SECURITIES AND STOCKHOLDERS' EQUITY                 $   758,099,574    $   718,695,679    $   710,047,074
                                                       ===============    ===============    ===============

    Investment assets under management                 $   359,317,231    $   317,394,210    $   323,412,576
                                                       ===============    ===============    ===============

    Mortgage loans serviced for others                 $    15,886,238    $    16,860,951    $    18,780,141
                                                       ===============    ===============    ===============

    Total assets, investment assets under management
      and mortgage loans serviced for others           $ 1,133,303,043    $ 1,052,950,840    $ 1,052,239,791
                                                       ===============    ===============    ===============



(1)  As disclosed in the footnotes to the statements of income,  on July 1, 2003
     the  company  adopted  a new  FASB  standard,  which  required  that  trust
     preferred securities be classified as interest bearing  liabilities.  Prior
     to the new FASB standard,  trust preferred  securities were recorded on the
     balance sheet between liabilities and equity.