MERCER INSURANCE GROUP INC
424B3, 1999-02-02
FIRE, MARINE & CASUALTY INSURANCE
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<PAGE>   1
                                                Filed Pursuant to Rule 424(b)(3)
                                                Registration No. 333-41497

 
                        [MERCER INSURANCE GROUP LOGO]

PROSPECTUS
 
                     UP TO 3,392,500 SHARES OF COMMON STOCK
 
    Mercer Insurance Group, Inc. (the "Company"), a Pennsylvania corporation and
the proposed holding company for Mercer Mutual Insurance Company ("Mercer
Mutual"), is offering up to 3,392,500 shares of its common stock, no par value
per share (the "Common Stock"), in a subscription offering (the "Subscription
Offering") pursuant to nontransferable subscription rights in the following
order of priority: (i) named insureds under policies of insurance issued by
Mercer Mutual and in force as of the close of business on October 17, 1997
("Eligible Policyholders"), (ii) the Company's tax-qualified employee stock
ownership plan (the "ESOP"), and (iii) directors, officers and employees of
Mercer Mutual. Subscription rights received in any of the foregoing categories
will be subordinated to the subscription rights received by those in a prior
category. Subscription rights are not transferable. Except for the ESOP, no
purchaser, together with associates of or persons acting in concert with such
person, may purchase, in the aggregate, more than 100,000 shares of Common Stock
in the Subscription Offering. The total number of shares of Common Stock offered
in the Subscription Offering may be increased to up to 3,769,444 shares if
necessary to satisfy the subscription rights of the ESOP.
 
    Concurrently with the Subscription Offering, the Company is offering the
Common Stock for sale to the general public in a community offering (the
"Community Offering"). Sales of Common Stock in the Community Offering will be
subject to the prior rights of holders of subscription rights and the right of
the Company, in its absolute discretion, to reject orders in the Community
Offering in whole or in part.
 
    In the sole discretion of the Company, shares not subscribed for in the
Subscription Offering and Community Offering (collectively, the "Conversion
Offerings"), if any, may be offered to the general public in a syndicated
community offering (the "Syndicated Community Offering") to be managed by
Sandler O'Neill & Partners, L.P. ("Sandler O'Neill").
 
    The Conversion Offerings and Syndicated Community Offering shall be
collectively referred to herein as the "Offerings." The Offerings are being made
in connection with the conversion of Mercer Mutual from mutual to stock form and
the simultaneous acquisition of the capital stock of Mercer Mutual by the
Company pursuant to a Plan of Conversion from Mutual to Stock Organization
adopted by the Board of Directors of Mercer Mutual on October 17, 1997, as
amended (the "Plan"). The Conversion of Mercer Mutual to stock form, the
issuance of the capital stock of Mercer Mutual to the Company and the offer and
sale of the Common Stock by the Company are collectively referred to herein as
the "Conversion." The completion of the Conversion is contingent upon the sale
of a minimum of 2,507,500 shares of Common Stock in the Offerings.
 
    No person may purchase fewer than 25 shares of Common Stock in the
Offerings.
 
    For more information, please call the Stock Information Center (the
"Conversion Center") toll-free at 1-888-303-9085.
 
    PROSPECTIVE INVESTORS SHOULD REVIEW AND CONSIDER THE DISCUSSION UNDER "RISK
FACTORS" BEGINNING ON PAGE 20.
 
    THESE SHARES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE COMMISSION, ANY STATE SECURITIES COMMISSION OR THE PENNSYLVANIA
DEPARTMENT OF INSURANCE (THE "PENNSYLVANIA DEPARTMENT"), NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION, ANY STATE SECURITIES COMMISSION OR THE PENNSYLVANIA
    DEPARTMENT PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------
                                                                 PURCHASE         FEES AND       ESTIMATED NET
                                                                 PRICE(1)        EXPENSES(2)      PROCEEDS(3)
                                                              --------------    -------------    --------------
<S>                                                           <C>               <C>              <C>
Per Share(4)                                                  $        10.00    $        0.73    $         9.27
- ---------------------------------------------------------------------------------------------------------------
Total Minimum                                                 $25,075,000.00    $2,070,150.00    $23,004,850.00
- ---------------------------------------------------------------------------------------------------------------
Total Midpoint                                                $29,500,000.00    $2,149,800.00    $27,350,200.00
- ---------------------------------------------------------------------------------------------------------------
Total Maximum                                                 $33,925,000.00    $2,229,450.00    $31,695,550.00
- ---------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Determined in accordance with an independent appraisal (the "Appraisal")
    prepared by Alex Sheshunoff & Company ("Sheshunoff") and updated as of
    December 28, 1998, which states that the consolidated pro forma market value
    of Mercer Mutual as a subsidiary of the Company ranged from $25,075,000 (the
    "Total Minimum") to $33,925,000 (the "Total Maximum") with a midpoint of
    $29,500,000 (the "Total Midpoint"). Collectively, the range from the Total
    Minimum to the Total Maximum is referred to herein as the "Estimated
    Valuation Range." Based on the Estimated Valuation Range, the Board of
    Directors of the Company and Mercer Mutual have determined to offer up to
    3,392,500 shares at a Purchase Price of $10.00 per share (the "Purchase
    Price"). The Company, however, may issue up to 3,769,444 shares in the event
    the ESOP purchases shares in excess of the Total Maximum, in order to
    satisfy the ESOP's 10% subscription. The final appraised value will be
    determined at the time of the closing of the Offerings and is subject to
    change. The valuation set forth in the Appraisal must not be construed as a
    recommendation by the Company, Mercer Mutual, Sandler O'Neill or Sheshunoff
    as to the advisability of purchasing such shares or that a purchaser
    subsequently will be able to sell such shares at or above the Purchase
    Price. If the final valuation is outside the Estimated Valuation Range, the
    Company will promptly notify all subscribers by mail of the final valuation.
    Subscribers will be given the opportunity to confirm or modify their orders.
    The funds of all subscribers who do not confirm or modify their orders will
    be returned promptly without interest. See "Use of Proceeds,"
    "Capitalization" and "Pro Forma Data."
 
(2) Consists of the estimated costs to the Company and Mercer Mutual arising in
    the Conversion, including estimated marketing fees and fixed expenses to be
    paid to Sandler O'Neill in connection with the Offerings, which fees and
    expenses are estimated to be $489,150 and $648,450 at the Total Minimum and
    the Total Maximum, respectively. See "Use of Proceeds" and "Pro Forma Data"
    for the assumptions used to arrive at these estimates. The actual fees and
    expenses may vary from these estimates. See "The Conversion -- Marketing and
    Underwriting Arrangements" and "-- Syndicated Community Offering."
 
(3) Represents net proceeds to the Company before the loan which the Company
    intends to make to the ESOP, which will be used by the ESOP to purchase 10%
    of the shares of Common Stock sold in the Subscription Offering. The amount
    of this loan will be $2.5 million at the Total Minimum, $3.0 million at the
    Total Midpoint, and $3.4 million at the Total Maximum. See "Use of
    Proceeds," "Capitalization," and "Pro Forma Data."
 
(4) Based on the Total Midpoint. The estimated net proceeds per share at the
    Total Minimum and Total Maximum are expected to be $9.17 and $9.34,
    respectively.
 
                            ------------------------
                        Sandler O'Neill & Partners, L.P.
                            ------------------------
                The date of this Prospectus is January 26, 1999
<PAGE>   2
 
     All shares of Common Stock will be sold in the Offerings for $10.00 per
share (the "Purchase Price"). The Appraisal is intended to be an estimate of the
consolidated pro forma market value of Mercer Mutual as a subsidiary of the
Company and is based on a review of internal projections and a comparison of the
consolidated financial condition and results of operations of Mercer Mutual to
property and casualty insurance industry averages and a peer group of
representative publicly-owned property and casualty insurance companies. The
Appraisal is not intended, and must not be construed, as a recommendation of any
kind as to the advisability of purchasing Common Stock. In preparing the
valuation, Sheshunoff has relied upon and assumed the accuracy and completeness
of financial and statistical information provided by the Company and Mercer
Mutual. Sheshunoff did not independently verify the financial statements,
projections and other information provided by the Company and Mercer Mutual,
perform an independent analysis of the assumptions underlying the financial
statements or projections or value independently the assets and liabilities of
the Company and Mercer Mutual. The valuation considers the Company and Mercer
Mutual as a going concern only and should not be considered as an indication of
the liquidation value of the Company and Mercer Mutual. Upon completion of the
Offerings, Sheshunoff will submit to the Company and to the Pennsylvania
Department its updated consolidated pro forma fair market value of Mercer Mutual
as a subsidiary of the Company. If the updated estimated valuation is within the
Estimated Valuation Range, the Conversion can be completed and the number of
shares of Common Stock sold in the Conversion will be determined as follows:
 
          (a) If participants in the Subscription Offering subscribe for
     3,392,500 shares or more, the Company, as required by the Plan, will sell
     all 3,392,500 shares offered hereby to participants in the Subscription
     Offering and will sell up to an additional 376,944 shares to the ESOP to
     satisfy its subscription in full. Shares will be allocated among
     participants in the Subscription Offering in accordance with the terms of
     the Plan and excess funds will be promptly returned to subscribers without
     interest. For a description of the allocation method and procedure, see
     "The Conversion -- The Conversion Offerings -- Subscription Offering."
 
          (b) If participants in the Subscription Offering subscribe for at
     least 2,507,500 shares but less than 3,392,500 shares, then, as required by
     the Plan, the Company will sell to participants in the Subscription
     Offering the number of shares of Common Stock sufficient to satisfy their
     subscriptions in full. The Company, in its sole discretion, may accept
     subscriptions in the Community Offering and/or sell shares in the
     Syndicated Community Offering provided the total number of shares of Common
     Stock sold in the Conversion does not exceed 3,392,500 shares (excluding
     shares sold to the ESOP). Preference in the Community Offering will be
     given to: (i) natural persons and trusts of natural persons (including
     individual retirement and Keogh retirement accounts) who reside in the
     states of New Jersey and Pennsylvania, (ii) principals of Eligible
     Policyholders in the case of an Eligible Policyholder that is not a natural
     person, (iii) licensed insurance agencies that have been appointed by
     Mercer Mutual to market and distribute policies of insurance, and their
     owners, (iv) holders of policies of insurance originally issued after
     October 17, 1997, and (v) providers of goods or services to, and identified
     by, Mercer Mutual. Any excess funds received in the Community Offering
     and/or the Syndicated Community Offering will be promptly returned to
     subscribers without interest after the completion of the Offerings.
 
          (c) If participants in the Subscription Offering subscribe for fewer
     than 2,507,500 shares, then the Company will sell to participants in the
     Subscription Offering the number of shares of Common Stock sufficient to
     satisfy their subscriptions in full and will accept subscriptions in the
     Community Offering and/or sell shares in the Syndicated Community Offering
     in an amount sufficient to sell at least 2,507,500 shares in the aggregate.
     The Company, in its sole discretion, may accept additional subscriptions in
     the Community Offering and sell additional shares in the Syndicated
     Community Offering provided the total number of shares sold in the
     Conversion does not exceed 3,392,500 (excluding shares sold to the ESOP).
     Preference in the Community Offering will be given to those subscribers
     identified in paragraph (b) above. Any excess funds received in the
     Community Offering and/or the Syndicated Community Offering will be
     promptly returned to subscribers without interest after the completion of
     the Offerings.
 
                                        2
<PAGE>   3
 
          (d) If the number of shares subscribed for in the Offerings is less
     than 2,507,500, then the Company will cancel the Offerings and all
     subscription funds will be returned promptly to subscribers without
     interest.
 
     There is a difference of approximately $8.9 million between the Total
Minimum and the Total Maximum of the Estimated Valuation Range. As a result of
this broad range, the final updated Appraisal may estimate a consolidated pro
forma market value for Mercer Mutual as a subsidiary of the Company that is
materially less than the aggregate dollar amount of subscriptions received by
the Company. Therefore, subscribers, in the aggregate and on a per share basis,
may pay materially more for the Common Stock than such estimated consolidated
pro forma market value. See "Risk Factors -- Possible Adverse Impact of Broad
Valuation Range and its Use to Determine the Number of Shares of Common Stock
Sold."
 
     Except for the ESOP, which intends to purchase 10% of the total number of
shares of Common Stock issued in the Conversion, no purchaser, together with
associates or persons acting in concert with such person, may purchase, in the
aggregate, more than 100,000 shares of Common Stock in the Conversion (4.0%,
3.4%, 3.0% and 2.7% of the number of shares issued at the Total Minimum, Total
Midpoint, Total Maximum and Total Maximum plus ESOP shares, respectively). No
person may purchase fewer than 25 shares. There are 42,178 Eligible
Policyholders. In the event that subscriptions by Eligible Policyholders for
Common Stock exceed the maximum of the Estimated Valuation Range, the Company
will be obligated under the Plan to sell to Eligible Policyholders 3,392,500
shares, which is the maximum number of shares offered hereby (excluding shares
expected to be purchased by the ESOP), and shares of Common Stock would be
allocated among Eligible Policyholders first, so as to permit each subscriber to
purchase up to 1,000 shares (unless the magnitude of subscriptions does not
permit such an allocation), and then in proportion to the respective amounts of
shares for which they subscribed. If all 42,178 Eligible Policyholders were to
subscribe for 100,000 shares of Common Stock, then each Eligible Policyholder
would receive only 80 shares. The Company is unable to predict the number of
Eligible Policyholders that may participate in the Subscription Offering.
 
     Directors and executive officers of the Company and Mercer Mutual as a
group (10 persons), including their associates, are expected to purchase
approximately 186,000 shares of the Common Stock to be issued in the Conversion
(7.4%, 6.3%, 5.5% and 4.9% at the Total Minimum, Total Midpoint, Total Maximum
and Total Maximum plus ESOP Shares, respectively), not including 10% of such
Common Stock expected to be purchased by the ESOP (250,750, 295,000, 339,250 and
376,944 shares at the Total Minimum, Total Midpoint, Total Maximum and Total
Maximum plus ESOP shares, respectively) and excluding additional shares that are
expected to be issued (or issuable) following the Conversion, subject to
shareholder approval, in connection with the implementation of the Company's
Stock Compensation Plan. See "Management of the Company -- Certain Benefit Plans
and Agreements."
 
     The Subscription Offering and the Community Offering will terminate at 1:00
p.m., Eastern Standard Time, on March 3, 1999, unless extended by the Company in
its sole discretion to a date no later than April 11, 1999 (the date and time of
termination, including any extensions, shall be hereinafter referred to as the
"Termination Date"). If the Company extends the Conversion Offerings, it will
give written notice of such extension to all subscribers on or before March 3,
1999, and each subscriber may withdraw or confirm his or her subscription by the
extended Termination Date. If a subscriber withdraws a subscription, or does not
confirm a subscription by the extended Termination Date, the subscriber's funds
will be returned promptly without interest. No action to extend the Conversion
Offerings may be taken by the Company after March 3, 1999. Subscribers may
purchase shares in the Conversion Offerings by completing and returning to the
Company a stock order form (the "Stock Order Form") and a certification form
(the "Certification Form"), together with full payment for all Common Stock
subscribed for at the Purchase Price. An executed Stock Order Form, once
received by the Company, may not be modified, amended or rescinded without the
consent of the Company. Subscriptions will be held in a separate escrow account
at State Street Bank and Trust Company, N.A. established specifically for this
purpose. If the Conversion is not completed within 45 days after the Termination
Date, the Offerings will be terminated and all funds held will be returned
promptly without interest. See "The Conversion -- The Conversion Offerings" and
"-- Purchases in the Conversion Offerings."
 
                                        3
<PAGE>   4
 
     The Company and Mercer Mutual have engaged Sandler O'Neill to consult with
and advise the Company and Mercer Mutual with respect to the Offerings, and
Sandler O'Neill has agreed to use its best efforts to assist the Company with
its solicitation of subscriptions and purchase orders for shares of Common Stock
in the Offerings. Sandler O'Neill is not obligated to purchase any shares of
Common Stock in the Offerings. The Company and Mercer Mutual will pay a fee to
Sandler O'Neill which will be based on the aggregate Purchase Price of Common
Stock sold in the Offerings. The Company and Mercer Mutual have agreed to
indemnify Sandler O'Neill against certain liabilities, including liabilities
arising under the Securities Act of 1933, as amended (the "Securities Act"). See
"The Conversion -- Marketing and Underwriting Arrangements."
 
     The Common Stock has been approved for inclusion in the Nasdaq National
Market under the symbol "MRCR," subject to completion of the Conversion. Prior
to the Conversion, there was no market for the Common Stock. Sandler O'Neill has
advised the Company that, following the completion of the Conversion, it intends
to make a market in the Common Stock, but it is under no obligation to do so.
One of the requirements for continued quotation of the Common Stock on the
Nasdaq National Market is that there be at least two market makers for the
Common Stock. There can be no assurance there will be two or more market makers
for the Common Stock. Additionally, the development of an active and liquid
public market depends on the existence of willing buyers and sellers, the
presence of which is not within the control of the Company, Mercer Mutual or any
market maker. There can be no assurance that an active and liquid trading market
for the Common Stock will develop or that, if developed, it will continue. The
absence or discontinuance of a market may have an adverse impact on both the
price and liquidity of the Common Stock. There is no assurance that persons
purchasing shares will be able to sell them at or above the Purchase Price or
that quotations will be available on the Nasdaq National Market as contemplated.
 
     THE CONVERSION IS CONTINGENT UPON APPROVAL OF THE PLAN BY ELIGIBLE
POLICYHOLDERS OF MERCER MUTUAL AT THE SPECIAL MEETING OF ELIGIBLE POLICYHOLDERS
CALLED FOR THAT PURPOSE TO BE HELD ON MARCH 3, 1999 (THE "SPECIAL MEETING") AND
THE SALE OF THE MINIMUM NUMBER OF SHARES OFFERED PURSUANT TO THE PLAN.
 
     PENNSYLVANIA INSURANCE LAWS AND REGULATIONS PROVIDE THAT NO PERSON MAY
ACQUIRE CONTROL OF THE COMPANY, AND THUS INDIRECT CONTROL OF MERCER MUTUAL,
UNLESS SUCH PERSON HAS OBTAINED THE PRIOR APPROVAL OF THE PENNSYLVANIA INSURANCE
COMMISSIONER. UNDER PENNSYLVANIA LAW, ANY PURCHASER OF 10% OR MORE OF THE VOTING
STOCK OF AN INSURANCE HOLDING COMPANY IS PRESUMED TO HAVE ACQUIRED CONTROL OF
AFFILIATED OR SUBSIDIARY INSURERS.
 
     NEW JERSEY INSURANCE LAWS AND REGULATIONS PROVIDE THAT NO PERSON MAY
ACQUIRE CONTROL OF THE COMPANY, AND THUS INDIRECT CONTROL OF MERCER INSURANCE
COMPANY OF NEW JERSEY, INC., A WHOLLY-OWNED INDIRECT SUBSIDIARY OF MERCER
MUTUAL, UNLESS SUCH PERSON HAS OBTAINED THE PRIOR APPROVAL OF THE NEW JERSEY
INSURANCE COMMISSIONER. UNDER NEW JERSEY LAW, ANY PURCHASER OF 10% OR MORE OF
THE VOTING STOCK OF AN INSURANCE HOLDING COMPANY IS PRESUMED TO HAVE ACQUIRED
CONTROL OF AFFILIATED OR SUBSIDIARY INSURERS.
 
                                        4
<PAGE>   5

                                ________________
 
                 ORGANIZATIONAL STRUCTURE BEFORE THE CONVERSION
                        MERCER MUTUAL INSURANCE COMPANY
                                      100%
                        QUEENSTOWN HOLDING COMPANY, INC.
                                      100%
                  MERCER INSURANCE COMPANY OF NEW JERSEY, INC.
                                ________________

                 ORGANIZATIONAL STRUCTURE AFTER THE CONVERSION

                                  SHAREHOLDERS
                                      100%
                          MERCER INSURANCE GROUP, INC.
                                      100%
                            MERCER INSURANCE COMPANY
                                      100%
                        QUEENSTOWN HOLDING COMPANY, INC.
                                      100%
                  MERCER INSURANCE COMPANY OF NEW JERSEY, INC.
 
                                        5
<PAGE>   6
 
                               PROSPECTUS SUMMARY
 
     The following summary does not purport to be complete and is qualified in
its entirety by the more detailed information and the Consolidated Financial
Statements and Notes thereto of Mercer Mutual appearing elsewhere in this
Prospectus. For an explanation of certain terms used in this Prospectus that are
commonly used in the insurance industry, see "Glossary of Selected Insurance
Terms."
 
     This Prospectus contains certain forward-looking statements within the
meaning of the "safe harbor" provisions of the Private Securities Litigation
Reform Act of 1995. Reference is made in particular to the descriptions of the
Company's and its subsidiaries' plans and objectives for future operations,
assumptions underlying such plans and objectives and other forward-looking
statements included in this Prospectus under "Use of Proceeds," "Business" and
"Risk Factors." Such statements are based on management's current expectations
and are subject to a number of factors and uncertainties which could cause
actual results to differ materially from those described in such forward-looking
statements. Factors which could cause such results to differ materially from
those described in the forward-looking statements include those set forth under
"RISK FACTORS" below.
 
MERCER INSURANCE GROUP,
INC...........................   The Company was formed under Pennsylvania law
                                 in November 1997 for the purpose of becoming
                                 the holding company for Mercer Mutual upon
                                 completion of the Conversion. Prior to the
                                 Conversion, the Company will not engage in any
                                 significant operations. After the Conversion,
                                 the Company's primary assets will be the
                                 outstanding capital stock of Mercer Mutual and
                                 a portion of the net proceeds of the
                                 Conversion.
 
                                 The Company's executive offices are located at
                                 10 North Highway 31, Pennington, New Jersey
                                 08534, and the Company's main telephone number
                                 is (609) 737-0426.
 
THE INSURANCE COMPANIES.......   Mercer Mutual is a Pennsylvania mutual
                                 insurance company that began operations in
                                 1844. Mercer Mutual was organized under the
                                 laws of the State of New Jersey and operated as
                                 a New Jersey mutual insurance company until
                                 October 16, 1997, when it filed Articles of
                                 Domestication with the Pennsylvania Department
                                 of State, which changed its state of domicile
                                 from New Jersey to Pennsylvania (the
                                 "Redomestication"). On the effective date of
                                 the Redomestication, the Pennsylvania
                                 Department replaced the New Jersey Department
                                 of Banking and Insurance (the "New Jersey
                                 Department") as Mercer Mutual's primary
                                 insurance regulator.
 
                                 Mercer Mutual owns all of the outstanding
                                 capital stock of Queenstown Holding Company,
                                 Inc. ("QHC"), the holding company for Mercer
                                 Insurance Company of New Jersey, Inc. ("MIC,"
                                 and collectively with Mercer Mutual, the
                                 "Insurance Companies"). Mercer Mutual is a
                                 property and casualty insurer of small and
                                 medium-sized businesses and property owners
                                 located in New Jersey and Pennsylvania. Mercer
                                 Mutual markets homeowners and commercial
                                 multi-peril policies, as well as other
                                 liability, workers' compensation, fire, allied,
                                 inland marine and commercial automobile
                                 coverages through approximately 140 independent
                                 agencies. MIC exclusively offers workers'
                                 compensation insurance to businesses located in
                                 New Jersey.
 
                                 For the years ended December 31, 1997 and 1996,
                                 Mercer Mutual and its subsidiaries had
                                 consolidated revenues of $21.0 million and
 
                                        6
<PAGE>   7
 
                                 $23.7 million respectively, and net income of
                                 $2.2 million and $640,000, respectively. For
                                 the nine months ended September 30, 1998,
                                 Mercer Mutual and its subsidiaries had
                                 consolidated revenue of $19.3 million and net
                                 income of $2.0 million. At September 30, 1998,
                                 Mercer Mutual and its subsidiaries had
                                 consolidated assets of $76.7 million, total
                                 equity of $25.8 million and over 42,000
                                 property and casualty policies in force.
 
                                 The principal strategies of the Company for the
                                 future are to:
 
                                 - Improve the mix of business by increasing
                                   commercial and casualty writings in order to
                                   enhance profitability and lessen the impact
                                   of property losses on overall results;
 
                                 - Geographically diversify its risk through
                                   acquisitions of other insurance companies in
                                   Pennsylvania and other jurisdictions, in
                                   order to reduce its overall exposure to
                                   weather-related property losses in its
                                   primary coverage area;
 
                                 - Attract and retain high-quality agencies
                                   having diverse customer bases in the
                                   Company's targeted growth markets within
                                   Pennsylvania and New Jersey, through
                                   increased marketing activities and the
                                   development and tailoring of commercial
                                   programs meeting the needs of their
                                   customers; and
 
                                 - Reduce its reliance on reinsurance by
                                   increasing the maximum exposure retained by
                                   the Insurance Companies on individual
                                   property and casualty risks, and thereby
                                   increase net premium volume.
 
                                 Management views the Conversion as a critical
                                 component of its strategic plan. The additional
                                 capital generated by the Conversion will permit
                                 the Insurance Companies to accelerate
                                 implementation of these strategies. The
                                 resulting holding company structure will also
                                 provide needed flexibility to achieve the
                                 Company's goals by permitting the Company to
                                 use its Common Stock or preferred stock to
                                 effect future acquisitions or raise additional
                                 capital. See "The Conversion -- Business
                                 Purposes."
 
THE CONVERSION................   Pursuant to the Plan, Mercer Mutual will (i)
                                 convert from a Pennsylvania-chartered mutual
                                 insurance company to a Pennsylvania-chartered
                                 stock insurance company, and (ii)
                                 simultaneously issue shares of its capital
                                 stock to the Company in exchange for a portion
                                 of the net proceeds from the sale of Common
                                 Stock in the Conversion. The Conversion will be
                                 accounted for as a simultaneous reorganization,
                                 recapitalization and share offering which will
                                 not change the historical accounting basis of
                                 Mercer Mutual's financial statements.
 
BACKGROUND AND REASONS FOR THE
  CONVERSION..................   Mercer Mutual's exposure to severe weather
                                 conditions has been a major factor affecting
                                 its underwriting results since 1991. Operating
                                 results in 1994 and 1996 were adversely
                                 affected by severe winter storms in such years
                                 that were largely responsible for Mercer
                                 Mutual's $1.4 million net operating loss in
                                 1994 and that reduced net income by $665,000 in
                                 1996. In order to reduce the risk caused by
                                 this exposure, Mercer Mutual's strategic plan
                                 is
                                        7
<PAGE>   8
 
                                 expressly predicated upon geographically
                                 diversifying its business and improving capital
                                 strength. Increased capital would facilitate
                                 diversification of risk through acquisitions
                                 and would provide additional policyholder
                                 protection by increasing policyholder surplus.
                                 Since 1996, Mercer Mutual has considered
                                 various capital formation alternatives and has
                                 elected to proceed with the Conversion in
                                 accordance with the provisions of the
                                 Pennsylvania Insurance Company Mutual to Stock
                                 Conversion Act (the "Act"). On October 17,
                                 1997, the Board of Directors of Mercer Mutual
                                 unanimously adopted the Plan. An application
                                 with respect to the Conversion was filed by
                                 Mercer Mutual with the Pennsylvania Department
                                 on November 26, 1997 and notice of the filing
                                 and the opportunity to comment on and to
                                 request and receive a copy of the Plan was
                                 simultaneously mailed to all Eligible
                                 Policyholders as required by law. On June 5,
                                 1998, the Pennsylvania Department held a public
                                 informational hearing regarding the Conversion.
                                 By orders dated October 20, 1998 (the
                                 "Orders"), the Plan was approved by the
                                 Pennsylvania Department and the Company
                                 received the approval of the Pennsylvania
                                 Department to acquire control of Mercer Mutual.
                                 The Plan is subject to the approval of the
                                 Eligible Policyholders at the Special Meeting.
 
ATTEMPT TO ACQUIRE MERCER
MUTUAL........................   On March 3, 1998, Mercer Mutual received an
                                 unsolicited offer from Franklin Mutual
                                 Insurance Company ("Franklin") to purchase from
                                 Mercer Mutual, upon the consummation of the
                                 Conversion, all of the to-be-issued capital
                                 stock of Mercer Mutual for a purchase price
                                 equal to the audited book value of Mercer
                                 Mutual at December 31, 1997. Mercer Mutual's
                                 Board of Directors unanimously rejected such
                                 offer. On April 3, 1998, Franklin reextended
                                 its offer to Mercer Mutual. Mercer Mutual's
                                 Board of Directors again unanimously rejected
                                 such offer. On both occasions, Mercer Mutual's
                                 Board of Directors determined that Franklin's
                                 offer was not in the best interests of Mercer
                                 Mutual and its policyholders and other
                                 constituents. See "Business -- Offer to Acquire
                                 Mercer Mutual."
 
LEGAL PROCEEDINGS.............   In May 1998, Franklin filed with the
                                 Pennsylvania Department a petition to intervene
                                 and request for a full adjudicatory hearing
                                 with respect to all proceedings of the
                                 Pennsylvania Department concerning Mercer
                                 Mutual's application for approval of the Plan.
                                 The Orders provide that, in approving the Plan,
                                 the Pennsylvania Department considered
                                 Franklin's petition to intervene and request
                                 for adjudicatory hearing as public comments,
                                 and not as formal pleadings because formal
                                 pleadings are not required or appropriate in
                                 the review of a proposed plan of conversion
                                 under the Act. On October 27, 1998, Franklin
                                 filed with the Pennsylvania Department an
                                 appeal of the Orders and a request for a full
                                 adjudicatory hearing. On November 6, 1998, the
                                 Pennsylvania Department rejected Franklin's
                                 appeal because the Pennsylvania Department had
                                 no jurisdiction to entertain such appeal. On
                                 November 9, 1998, Franklin filed a petition for
                                 review in the nature of an appeal with the
                                 Pennsylvania Commonwealth Court objecting to
                                 and requesting that such court reverse the
                                 Orders. Franklin's petition is still
 
                                        8
<PAGE>   9
 
                                 pending. See "Business -- Legal Proceedings"
                                 and "The Conversion -- Background and Reasons
                                 for the Conversion."
 
ORGANIZATION BEFORE AND AFTER
THE CONVERSION................   Set forth on page 5 of the Prospectus is an
                                 illustration of the organizational structure of
                                 the Insurance Companies before the Conversion
                                 and of the Company and the Insurance Companies
                                 after the Conversion.
 
STOCK PRICING AND NUMBER OF
SHARES TO BE ISSUED...........   Pennsylvania law requires that the aggregate
                                 purchase price of the Common Stock to be issued
                                 in the Conversion be consistent with an
                                 independent appraisal (the "Appraisal") of the
                                 estimated consolidated pro forma market value
                                 of Mercer Mutual as a subsidiary of the Company
                                 following the Conversion. Alex Sheshunoff &
                                 Company ("Sheshunoff"), a firm experienced in
                                 corporate valuations, has performed the
                                 Appraisal and has determined that, as of
                                 December 28, 1998, the estimated pro forma
                                 market value of Mercer Mutual as a subsidiary
                                 of the Company ranged from $25.1 million to
                                 $33.9 million, with a midpoint of $29.5
                                 million. The Company, in consultation with its
                                 advisors, has determined to offer the shares in
                                 the Conversion at the Purchase Price.
 
                                 The Appraisal is intended to be an estimate of
                                 the consolidated pro forma market value of
                                 Mercer Mutual as a subsidiary of the Company,
                                 and is based on a review of internal
                                 projections, and a comparison of the
                                 consolidated financial condition and results of
                                 operations of Mercer Mutual to property and
                                 casualty insurance company averages and a peer
                                 group of representative publicly owned property
                                 and casualty insurance companies. The Appraisal
                                 is not intended, and must not be construed, as
                                 a recommendation of any kind by the Company,
                                 Mercer Mutual, Sandler O'Neill or Sheshunoff as
                                 to the advisability of purchasing Common Stock.
                                 In preparing the Appraisal, Sheshunoff has
                                 relied upon and assumed the accuracy and
                                 completeness of financial and statistical
                                 information provided by the Company, and
                                 Sheshunoff did not independently verify the
                                 financial statements, projections and other
                                 information provided by the Company and Mercer
                                 Mutual, perform an independent analysis of the
                                 assumptions underlying the financial statements
                                 or projections or value independently the
                                 assets and liabilities of the Company and
                                 Mercer Mutual. The Appraisal considers the
                                 Company and Mercer Mutual as a going concern
                                 only and should not be considered as an
                                 indication of the liquidation value of the
                                 Company and Mercer Mutual.
 
                                 The Appraisal will be updated immediately prior
                                 to completion of the Offerings, and such
                                 updated Appraisal will be filed with the
                                 Securities and Exchange Commission pursuant to
                                 a post-effective amendment to the registration
                                 statement of which this prospectus is a part.
                                 If the value reflected in the updated Appraisal
                                 is within the Estimated Valuation Range, the
                                 Company will not notify subscribers of the
                                 updated Appraisal and the Conversion will be
                                 consummated.
 
                                 If participants in the Subscription Offering
                                 subscribe for 3,392,500 shares or more, the
                                 Company, as required by the Plan, will sell all
 
                                        9
<PAGE>   10
 
                                 3,392,500 shares offered hereby to participants
                                 in the Subscription Offering and will sell up
                                 to an additional 376,944 shares to the ESOP to
                                 satisfy its subscription in full. Shares will
                                 be allocated among participants in the
                                 Subscription Offering in accordance with the
                                 terms of the Plan and excess funds will be
                                 promptly returned to subscribers without
                                 interest. If participants in the Subscription
                                 Offering subscribe for at least 2,507,500
                                 shares but less than 3,392,500 shares, then, as
                                 required by the Plan, the Company will sell to
                                 participants in the Subscription Offering the
                                 number of shares of Common Stock sufficient to
                                 satisfy their subscriptions in full. The
                                 Company, in its sole discretion, may accept
                                 subscriptions in the Community Offering and
                                 sell shares in the Syndicated Community
                                 Offering provided the total number of shares of
                                 Common Stock sold in the Conversion does not
                                 exceed 3,392,500 shares (excluding the shares
                                 sold to the ESOP). Any excess funds received in
                                 the Community Offering or the Syndicated
                                 Community Offering will be promptly returned to
                                 subscribers without interest after the
                                 completion of the Offerings. If participants in
                                 the Subscription Offering subscribe for fewer
                                 than 2,507,500 shares, then the Company will
                                 sell to participants in the Subscription
                                 Offering the number of shares of Common Stock
                                 sufficient to satisfy their subscriptions in
                                 full and will accept subscriptions in the
                                 Community Offering and/or sell shares in the
                                 Syndicated Community Offering in an amount
                                 sufficient to sell at least 2,507,500 shares in
                                 the aggregate. The Company, in its sole
                                 discretion, may accept additional subscriptions
                                 in the Community Offering and sell additional
                                 shares in the Syndicated Community Offering
                                 provided the total number of shares sold in the
                                 Conversion does not exceed 3,392,500 (excluding
                                 the shares sold to the ESOP). Any excess funds
                                 received in the Community Offering or the
                                 Syndicated Community Offering will be promptly
                                 returned to subscribers without interest after
                                 the completion of the Offerings. If the number
                                 of shares subscribed for in the Offerings is
                                 less than 2,507,500, then the Company will
                                 cancel the Offerings and all subscription funds
                                 will be returned promptly to subscribers
                                 without interest.
 
                                 If the value reflected in the updated Appraisal
                                 is not within the Estimated Valuation Range,
                                 the Company may terminate the Offerings. If in
                                 such event the Company proceeds with the
                                 Offerings, then the Company will deliver
                                 promptly to the subscribers an updated
                                 prospectus containing a description of the
                                 updated Appraisal. The Conversion Valuation
                                 Report containing the updated Appraisal will
                                 not be delivered to subscribers, but will be an
                                 exhibit to a post-effective amendment to the
                                 registration statement of which this prospectus
                                 is a part, and may be obtained through the
                                 Securities and Exchange Commission directly or
                                 accessed through its Internet website at
                                 http://www.sec.gov. See "Available
                                 Information." Subscribers will be given the
                                 opportunity to confirm or modify their orders.
                                 The funds of all subscribers who do not confirm
                                 or modify their orders will be returned
                                 promptly without interest. Subscription orders
                                 may not be withdrawn for any reason if the
                                 updated Appraisal is within the Estimated
                                 Valuation Range.
 
                                       10
<PAGE>   11
 
                                 There is a difference of approximately $8.9
                                 million between the minimum and the maximum of
                                 the Estimated Valuation Range. Therefore,
                                 subscribers, in the aggregate and on a per
                                 share basis, may pay more for the Common Stock
                                 than the consolidated pro forma market value of
                                 Mercer Mutual as a subsidiary of the Company.
                                 See "Risk Factors -- Adverse Impact of Broad
                                 Valuation Range and Its Use to Determine the
                                 Number of Shares of Common Stock Sold."
 
THE SUBSCRIPTION AND COMMUNITY
  OFFERINGS...................   The shares of Common Stock to be issued in the
                                 Conversion are being offered at a purchase
                                 price of $10.00 per share (the "Purchase
                                 Price") in the Subscription Offering pursuant
                                 to nontransferable subscription rights in the
                                 following order of priority: (i) Eligible
                                 Policyholders, (ii) the ESOP, and (iii)
                                 directors, officers and employees of Mercer
                                 Mutual. Subscription rights of directors,
                                 officers and employees of Mercer Mutual will be
                                 subordinated to subscription rights of Eligible
                                 Policyholders. Concurrently, and subject to the
                                 prior rights of holders of subscription rights,
                                 any shares of Common Stock not subscribed for
                                 in the Subscription Offering are being offered
                                 at the Purchase Price in the Community Offering
                                 to members of the general public. Preference
                                 will be given in the Community Offering to (i)
                                 natural persons and trusts of natural persons
                                 who are permanent residents of New Jersey and
                                 Pennsylvania (the "Local Community"), (ii)
                                 principals of Eligible Policyholders in the
                                 case of an Eligible Policyholder that is not a
                                 natural person, (iii) licensed insurance
                                 agencies that have been appointed by Mercer
                                 Mutual to market and distribute policies of
                                 insurance, and their owners, (iv) named
                                 insureds under policies of insurance issued by
                                 Mercer Mutual after October 17, 1997, and (v)
                                 providers of goods and services to, and
                                 identified by, Mercer Mutual. The Company
                                 reserves the absolute right to accept or reject
                                 any orders in the Community Offering, in whole
                                 or in part.
 
                                 Subscription rights will expire if not
                                 exercised by, and the Conversion Offerings will
                                 terminate at, 1:00 p.m., Eastern Standard Time
                                 on March 3, 1999, unless extended by the
                                 Company to a date no later than April 11, 1999
                                 (the date and time of termination, including
                                 any extensions, shall be hereinafter referred
                                 to as the "Termination Date"). If the Company
                                 extends the Termination Date, it will given
                                 written notice of such extension to all
                                 subscribers on or before March 3, 1999, at
                                 which time each subscriber may withdraw or
                                 confirm his or her subscription by the extended
                                 Termination Date. If a Subscriber withdraws or
                                 does not confirm a subscription by the extended
                                 Termination Date, the subscriber's funds will
                                 be returned promptly without interest. In no
                                 event shall the extended Termination Date be
                                 later than April 11, 1999.
 
THE SYNDICATED COMMUNITY
OFFERING......................   If participants in the Conversion Offerings
                                 (excluding the ESOP) subscribe for fewer than
                                 3,392,500 shares in the aggregate, the Company,
                                 in its sole discretion, may sell additional
                                 shares in the Syndicated Community Offering.
                                 All shares of Common Stock offered in the
                                 Syndicated Community Offering will be offered
                                 for sale at the Purchase Price to the general
                                 public on a best efforts
 
                                       11
<PAGE>   12
 
                                 basis through a syndicate of registered
                                 broker-dealers to be formed and managed by
                                 Sandler O'Neill, acting as agent of the Company
                                 to assist the Company in the sale of Common
                                 Stock. The Syndicated Community Offering would
                                 be commenced as soon as practicable following
                                 the Termination Date, and must be completed
                                 within 45 days thereafter. The Company reserves
                                 the absolute right to reject orders, in whole
                                 or in part, in its sole discretion, in the
                                 Syndicated Community Offering. See "The
                                 Conversion -- Marketing and Underwriting
                                 Arrangements" and "-- Syndicated Community
                                 Offering."
 
PROSPECTUS DELIVERY AND
  PROCEDURE FOR PURCHASING
  SHARES......................   To ensure that each purchaser receives a
                                 prospectus at least 48 hours prior to the
                                 Termination Date in accordance with Rule 15c2-8
                                 of the Securities Exchange Act of 1934, as
                                 amended (the "Exchange Act"), no prospectus
                                 will be mailed later than five days prior to
                                 the Termination Date or hand delivered later
                                 than two days prior to such date. Stock Order
                                 Forms and Certification Forms will be
                                 distributed only with a prospectus. The Company
                                 is not obligated to accept for processing
                                 orders not submitted on Stock Order Forms and
                                 not accompanied by a Certification Form. Any
                                 person who desires to subscribe for shares of
                                 Common Stock in the Offerings must do so prior
                                 to the Termination Date by delivering to the
                                 Conversion Center by mail at P.O. Box 15,
                                 Pennington, New Jersey 08534-0015, or in person
                                 at the Company's principal executive offices
                                 located at 10 North Highway 31, Pennington, New
                                 Jersey 08534, a properly executed and completed
                                 Stock Order Form and Certification Form,
                                 together with full payment for all shares for
                                 which the subscription is made. A Stock Order
                                 Form and Certification Form will be included
                                 with each prospectus delivered to a prospective
                                 purchaser of Common Stock and no Stock Order
                                 Form or Certification Form will be delivered to
                                 a prospective purchaser unless accompanied by a
                                 prospectus or prior delivery of a prospectus
                                 can be verified. Payment for shares of Common
                                 Stock may be made by check or money order. All
                                 checks or money orders must be made payable to
                                 "Mercer Insurance Group, Inc." Subscriptions
                                 will be held in a separate escrow account at
                                 State Street Bank and Trust Company, N.A.. Such
                                 funds will not be released until the Conversion
                                 is completed or terminated. The Conversion will
                                 be completed or terminated no later than May
                                 26, 1999. If the number of shares subscribed
                                 for in the Offerings at the Purchase Price
                                 through May 26, 1999 is less than 2,507,500
                                 shares, then the Company will cancel the
                                 Offerings on such date and all subscription
                                 funds will be returned promptly to subscribers
                                 without interest.
 
                                 All subscription rights under the Plan will
                                 expire on the Termination Date, whether or not
                                 the Company has been able to locate each person
                                 entitled to such subscription rights. ONCE
                                 TENDERED, ORDERS TO PURCHASE COMMON STOCK IN
                                 THE OFFERING CANNOT BE REVOKED. In the event of
                                 an oversubscription in the Subscription
                                 Offering, shares of Common Stock will be
                                 allocated among subscribing Eligible
                                 Policyholders, as follows. First, shares of
                                 Common Stock will be allocated among
                                 subscribing Eligible Policyholders so

                                       12
<PAGE>   13
 
                                 as to permit each such Eligible Policyholder,
                                 to the extent possible, to purchase the lesser
                                 of (i) 1,000 shares, or (ii) the number of
                                 shares for which such Eligible Policyholder has
                                 subscribed. Second, any shares of Common Stock
                                 remaining after such initial allocation will be
                                 allocated among the subscribing Eligible
                                 Policyholders whose subscriptions remain
                                 unsatisfied in the proportion in which the
                                 aggregate number of shares as to which each
                                 such Eligible Policyholder's subscription
                                 remains unsatisfied bears to the aggregate
                                 number of shares as to which all such Eligible
                                 Policyholders' subscriptions remain
                                 unsatisfied, provided, however, that no
                                 fractional shares of Common Stock will be
                                 issued. If, because of the magnitude of the
                                 oversubscription, shares of Common Stock cannot
                                 be allocated among subscribing Eligible
                                 Policyholders so as to permit each such
                                 Eligible Policyholder to purchase the lesser of
                                 1,000 shares or the number of shares subscribed
                                 for, then shares of Common Stock will be
                                 allocated among the subscribing Eligible
                                 Policyholders in the proportion in which: (i)
                                 the aggregate number of shares subscribed for
                                 by each such Eligible Policyholder bears to
                                 (ii) the aggregate number of shares subscribed
                                 for by all Eligible Policyholders; provided,
                                 however, that no fractional shares of Common
                                 Stock shall be issued. For more information,
                                 please call the Conversion Center toll-free at
                                 1-888-303-9085. See "The Conversion -- The
                                 Conversion Offerings," "-- Purchases in the
                                 Conversion Offerings" and "-- Marketing and
                                 Underwriting Arrangements."
 
PURCHASE LIMITATIONS..........   No person may purchase fewer than 25 shares in
                                 the Offerings. The ESOP may purchase up to an
                                 aggregate of 10% of the shares of Common Stock
                                 to be issued in the Conversion and is expected
                                 to do so. With the exception of the ESOP, no
                                 person (including Eligible Policyholders who
                                 elect to purchase stock in the Conversion),
                                 together with his or her associates or persons
                                 acting in concert with him or her, may purchase
                                 in the aggregate, more than 100,000 shares of
                                 Common Stock (4.0% of the shares to be issued
                                 in the Conversion at the Total Minimum of the
                                 Estimated Valuation Range). There are 42,178
                                 Eligible Policyholders. In the event that
                                 subscriptions by Eligible Policyholders for
                                 Common Stock exceed the maximum of the
                                 Estimated Valuation Range, the Company will be
                                 obligated under the Plan to sell to Eligible
                                 Policyholders 3,392,500 shares, which is the
                                 maximum number of shares offered hereby
                                 (excluding shares expected to be purchased by
                                 the ESOP), and shares of Common Stock would be
                                 allocated among Eligible Policyholders first,
                                 so as to permit each subscriber to purchase up
                                 to 1,000 shares (unless the magnitude of
                                 subscriptions does not permit such an
                                 allocation), and then in proportion to the
                                 respective amounts of shares for which they
                                 subscribed. If all Eligible Policyholders were
                                 to subscribe for 100,000 shares of Common Stock
                                 offered, then each Eligible Policyholder would
                                 receive only approximately 80 shares. The
                                 Company is unable to predict the number of
                                 Eligible Policyholders that may participate in
                                 the Subscription Offering.
 
                                       13
<PAGE>   14
 
PURCHASE OF COMMON STOCK BY
  MANAGEMENT..................   The directors and executive officers of the
                                 Company and Mercer Mutual, each of whom is an
                                 Eligible Policyholder, together with their
                                 associates, propose to purchase, in the
                                 aggregate, approximately 186,000 shares of
                                 Common Stock in the Conversion, which equals
                                 6.3% of the shares of Common Stock to be issued
                                 in the Conversion assuming an offering at the
                                 Total Midpoint of the Estimated Valuation Range
                                 (but excluding shares purchased by the ESOP).
                                 All such shares will be purchased by the
                                 directors and executive officers and their
                                 associates, if any, in the Subscription
                                 Offering and in their capacities as Eligible
                                 Policyholders. See "The Conversion -- Proposed
                                 Management Purchases."
 
BENEFITS TO MANAGEMENT........   Up to 10.9% of the net proceeds of the
                                 Offerings is expected to be used to fund the
                                 purchase by the ESOP of 10% of the shares of
                                 Common Stock sold in the Conversion. These
                                 shares will be awarded over a ten-year period
                                 to substantially all of Mercer Mutual's
                                 employees in exchange for their services
                                 rendered to Mercer Mutual. See "Use of
                                 Proceeds." Subject to shareholder approval, the
                                 Board of Directors of the Company also intends
                                 to adopt (i) a Management Recognition Plan (the
                                 "MRP") pursuant to which the Company intends to
                                 award to employees and directors of the
                                 Company, pursuant to awards which vest over a
                                 five-year period, up to 4% of the number of
                                 shares of Common Stock sold in the Conversion
                                 in exchange for their services rendered to
                                 Mercer Mutual, and (ii) a Stock Compensation
                                 Plan (the "Compensation Plan") pursuant to
                                 which the Company intends to grant options to
                                 purchase Common Stock (at its fair market value
                                 on the date of the option grant) to employees
                                 and directors of the Company, in an amount up
                                 to 10% of the number of shares of Common Stock
                                 sold in the Conversion. The Company intends to
                                 award shares under the MRP and to grant stock
                                 options under the Compensation Plan as soon as
                                 practicable after the approval of the MRP and
                                 the Compensation Plan by the Company's
                                 shareholders. The MRP and the Stock
                                 Compensation Plan must be approved by the
                                 Company's shareholders, and may be submitted to
                                 the shareholders for approval no sooner than
                                 six months after the consummation of the
                                 Conversion. No decisions concerning the number
                                 of shares to be awarded or options to be
                                 granted to any director or officer have been
                                 made at this time. See "Management of the
                                 Company -- Certain Benefit Plans and
                                 Agreements."
 
USE OF PROCEEDS...............   The amount of the net proceeds from the
                                 Offerings will depend upon the total number of
                                 shares sold and the expenses of the Conversion.
                                 As a result, the net proceeds from the
                                 Offerings cannot be determined until the
                                 Conversion is completed. The Company
                                 anticipates that net proceeds will be at least
                                 $23.0 million. See "Use of Proceeds" for the
                                 assumptions used to arrive at this estimate.
 
                                 Between 10.9% and 10.7% of the net proceeds
                                 retained by the Company will be used for a loan
                                 by the Company to the ESOP to enable it to
                                 purchase 10% of the shares of Common Stock
                                 issued in the Conversion. The loan will fund
                                 the entire purchase price of the
 
                                       14
<PAGE>   15
 
                                 shares purchased by the ESOP in the Conversion
                                 ($3.8 million at the Total Maximum of the
                                 Estimated Valuation Range plus the ESOP shares)
                                 and will be repaid principally from Mercer
                                 Mutual's contributions to the ESOP and from
                                 dividends payable on unallocated shares of
                                 Common Stock held by the ESOP. The Company has
                                 received Pennsylvania Department approval to
                                 contribute $5.0 million of net proceeds from
                                 the Offerings to Mercer Mutual in exchange for
                                 all of the capital stock of Mercer Mutual to be
                                 issued in the Conversion. Assuming net proceeds
                                 from the Offerings of between $23.0 million and
                                 $35.4 million and the implementation of the
                                 ESOP, the Company would retain between $15.5
                                 million and $26.6 million after acquiring the
                                 stock of Mercer Mutual. These funds will be
                                 available for a variety of corporate purposes
                                 including, but not limited to, additional
                                 capital contributions to Mercer Mutual, future
                                 acquisitions within the property and casualty
                                 insurance industry, dividends to shareholders
                                 and future repurchases of Common Stock to the
                                 extent permitted by Pennsylvania law and the
                                 Pennsylvania Department. With the exception of
                                 the ESOP Loan and the capital contribution to
                                 Mercer Mutual, the Company currently has no
                                 specific plans, intentions, arrangements or
                                 understandings regarding any of the foregoing
                                 activities. See "Dividend Policy."
 
                                 The portion of the net proceeds contributed to
                                 Mercer Mutual will become part of Mercer
                                 Mutual's capital, thereby expanding
                                 underwriting capacity and permitting
                                 diversification of its business. Mercer Mutual
                                 may cause a portion of the net proceeds it
                                 receives from the Company to be contributed to
                                 MIC in connection with MIC's planned expansion
                                 of its New Jersey business beyond workers'
                                 compensation insurance to include the same
                                 types of insurance currently written by Mercer
                                 Mutual. See "Business -- Products."
 
NON-TRANSFERABILITY OF
  SUBSCRIPTION RIGHTS.........   The Plan provides that no person shall transfer
                                 or enter into any agreement or understanding to
                                 transfer the legal or beneficial ownership of
                                 subscription rights issued under the Plan or,
                                 prior to exercise of the subscription rights,
                                 the shares of Common Stock to be issued upon
                                 their exercise. Persons violating such
                                 prohibition will lose their right to purchase
                                 Common Stock in the Conversion. Each person
                                 exercising subscription rights will be required
                                 to certify that his or her purchase of Common
                                 Stock is solely for the purchaser's own account
                                 and that there is no agreement or understanding
                                 regarding the sale or transfer of such shares.
 
MARKET FOR THE COMMON STOCK...   The Company has received approval to have the
                                 Common Stock quoted on the Nasdaq National
                                 Market under the symbol "MRCR," subject to
                                 completion of the Conversion. Sandler O'Neill
                                 has advised the Company that following the
                                 Conversion, it intends to make a market in the
                                 Common Stock, but it is under no obligation to
                                 do so. Prior to the Offerings, there was no
                                 public market for the Common Stock and there
                                 can be no assurance that an active and liquid
                                 trading market for the Common Stock will
                                 develop or that if developed, it will continue,
                                 nor is there any
 
                                       15
<PAGE>   16
 
                                 assurance that persons purchasing shares of
                                 Common Stock will be able to sell their shares
                                 at or above the Purchase Price or that
                                 quotations will be available on the Nasdaq
                                 National Market as contemplated. See "Market
                                 for the Common Stock."
 
DIVIDENDS.....................   Declaration of dividends by the Board of
                                 Directors of the Company will depend on a
                                 number of factors, including the requirements
                                 of applicable law and the determination by the
                                 Board of Directors of the Company that the net
                                 income, capital and financial condition of the
                                 Company and the Insurance Companies, industry
                                 trends, general economic conditions and other
                                 factors justify the payment of dividends. In
                                 addition, the payment of dividends from Mercer
                                 Mutual to the Company and from the Company to
                                 its shareholders is subject to a number of
                                 regulatory conditions, including conditions
                                 imposed by the Pennsylvania Department in the
                                 Orders in connection with its approval of the
                                 Conversion. The Company has not yet determined
                                 whether it will pay dividends to its
                                 shareholders in the foreseeable future, and no
                                 assurance can be given that dividends will be
                                 permitted to be paid under the terms of the
                                 Orders or will ultimately be declared by the
                                 Board of Directors of the Company. See
                                 "Dividend Policy" and "Business -- Regulation."
 
ANTITAKEOVER PROVISIONS.......   The Articles of Incorporation and Bylaws of the
                                 Company, Pennsylvania statutory provisions and
                                 employee benefit arrangements, as well as
                                 certain other provisions of state and federal
                                 law, may have the effect of discouraging or
                                 preventing a non-negotiated change in control
                                 of the Company, as well as a proxy contest for
                                 control of the Board of Directors of the
                                 Company. For a detailed discussion of those
                                 provisions, see "Risk Factors -- Articles of
                                 Incorporation, Bylaw and Statutory Provisions
                                 that Could Discourage Hostile Acquisitions of
                                 Control," "Management -- Certain Benefit Plans
                                 and Agreements," "Certain Restrictions on
                                 Acquisition of the Company" and "Description of
                                 Capital Stock."
 
                                       16
<PAGE>   17
 
                                 MERCER MUTUAL
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The following table sets forth selected consolidated financial data for
Mercer Mutual prior to the Conversion and should be read in conjunction with the
Consolidated Financial Statements, and accompanying notes thereto and other
financial information included elsewhere herein, as well as "Management's
Discussion and Analysis of Financial Condition and Results of Operations." The
consolidated statement of income data for the year ended December 31, 1994 and
the consolidated balance sheet data at December 31, 1995 are derived from the
audited consolidated financial statements of Mercer Mutual and its subsidiaries
not included in this Prospectus. The consolidated statement of income data for
the year ended December 31, 1993 and for the nine months ended September 30,
1997 and 1998 and the consolidated balance sheet data at December 31, 1993 and
1994 and at September 30, 1997 and 1998 are derived from the unaudited
consolidated financial statements of Mercer Mutual and its subsidiaries and
include all adjustments (consisting only of normal recurring accruals) that the
Company considers necessary for a fair presentation of such financial
information for such periods.
 
                                       17
<PAGE>   18
 
                                 MERCER MUTUAL
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                      NINE MONTHS ENDED
                                        SEPTEMBER 30,                           YEAR ENDED DECEMBER 31,
                                    ---------------------      ----------------------------------------------------------
                                       1998        1997           1997        1996       1995        1994        1993
                                    ----------    -------      ----------    -------    -------   ----------- -----------
                                         (UNAUDITED)                       (DOLLARS IN THOUSANDS)             (UNAUDITED)
<S>                                 <C>           <C>          <C>           <C>        <C>       <C>         <C>
Revenue Data:
Direct premiums written...........  $   22,977    $21,504      $   28,453    $24,958    $24,699     $24,355     $23,349
Net premiums written(1)(2)........      20,734     12,904          17,461     20,124     21,245      19,377      18,964
Statement of Income Data:
Net premiums earned...............      17,110     13,288          17,969     20,634     20,817      18,681      18,225
Net investment income.............       1,656      1,793           2,350      2,289      2,132       1,904       2,196
Net realized investment gains.....         368        483             589        596         53         277         509
Other income......................         124        144             173        155        161         166         159
                                    ----------    -------      ----------    -------    -------     -------     -------
        Total revenues............      19,258     15,708          21,081     23,674     23,163      21,028      21,089
                                    ----------    -------      ----------    -------    -------     -------     -------
Losses and Expenses:
  Losses and loss adjustment
    expenses(2)(3)................       8,739      8,038          10,594     14,801     13,296      14,107      11,631
  Other underwriting expenses.....       7,591      5,461           7,269      8,062      8,360       8,976       8,494
                                    ----------    -------      ----------    -------    -------     -------     -------
        Total expenses............      16,330     13,499          17,863     22,863     21,656      23,083      20,125
                                    ----------    -------      ----------    -------    -------     -------     -------
Income (loss) before federal
  income taxes....................       2,928      2,209           3,218        811      1,507      (2,055)        964
Federal income tax expense
  (benefit).......................         966        694           1,001        171        369        (681)        165
                                    ----------    -------      ----------    -------    -------     -------     -------
Net income (loss)(3)..............  $    1,962    $ 1,515      $    2,217    $   640    $ 1,138     $(1,374)    $   799
                                    ==========    =======      ==========    =======    =======     =======     =======
   Selected Balance Sheet Data
         (at period end):                                                                         (UNAUDITED) (UNAUDITED)
  Total investments and cash......  $   55,976    $47,443      $   48,506    $45,434    $44,022     $35,470     $40,414
  Total assets....................      76,719     73,258          74,085     74,074     77,523      71,750      71,110
  Total liabilities...............      50,883     51,312          50,849     54,792     58,560      57,547      53,469
  Total equity....................  $   25,836    $21,946      $   23,236    $19,282    $18,963     $14,202     $17,641
GAAP Ratios:
  Loss and loss adjustment expense
    ratio(3)(4)...................        51.1%      60.5%           58.9%      71.7%      63.9%       75.5%       63.8%
  Underwriting expense ratio(5)...        44.4%      41.1%           40.5%      39.1%      40.2%       48.0%       46.6%
  Combined ratio(6)...............        95.5%     101.6%           99.4%     110.8%     104.1%      123.5%      110.4%
Statutory Data:
  Statutory combined ratio........        92.2%     102.6%          102.1%     110.5%     103.0%      122.6%      110.7%
  Industry combined ratio(7)......       104.2%     101.0%          101.6%     105.9%     106.4%      108.4%      106.9%
  Statutory surplus...............  $   21,323    $19,034      $   20,132    $16,087    $14,938     $11,133     $12,979
  Ratio of statutory net written
    premiums to statutory
    surplus(8)....................        1.30x       .90x            .87x      1.25x      1.42x       1.74x       1.46x
Pro Forma Data(9):
  Net income......................  $    1,838                 $    2,051
  Net income per share of Common
    Stock.........................  $     0.80                 $     0.90
  Weighted average number of
    shares of Common Stock
    outstanding...................   2,291,228                  2,269,288
</TABLE>
 
- ---------------
(1) The increase from September 30, 1997 to September 30, 1998 reflects the
    restructuring of Mercer Mutual's reinsurance programs during both years.
 
(2) The decrease from December 31, 1996 to December 31, 1997 reflects the
    termination, as of December 31, 1996, of Mercer Mutual's participation in a
    pooling arrangement with two other insurance companies. See "Management's
    Discussion and Analysis of Financial Condition and Results of Operations."
 
(3) Losses and loss adjustment expenses, net income and loss and loss expense
    ratios for the years ended December 31, 1994 and 1996 were adversely
    affected by the frequency and severity of weather-related
                                       18
<PAGE>   19
                                 MERCER MUTUAL
              SELECTED CONSOLIDATED FINANCIAL DATA -- (CONTINUED)
 
    property losses. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations."
 
(4) Calculated by dividing losses and loss adjustment expenses by net premiums
    earned.
 
(5) Calculated by dividing other underwriting expenses by net premiums earned.
 
(6) The sum of the Loss and Loss Adjustment Expense Ratio and the Underwriting
    Expense Ratio.
 
(7) As reported by A.M. Best Company, Inc., an independent insurance rating
    organization.
 
(8) Annualized for the periods ended September 30, 1997 and 1998.
 
(9) Information excerpted from unaudited Pro Forma Condensed Consolidated
    Statements of Income for the year ended December 31, 1997 and the nine
    months ended September 30, 1998. See "Pro Forma Data."
 
                                       19
<PAGE>   20
 
                                  RISK FACTORS
 
     Before investing in the Common Stock offered hereby, prospective investors
should carefully consider all of the information set forth in this prospectus
and, in particular, the matters presented below.
 
POSSIBLE ADVERSE IMPACT OF CATASTROPHE AND NATURAL PERIL LOSSES ON FINANCIAL
CONDITION AND RESULTS OF OPERATIONS
 
     In common with other property and casualty insurers, Mercer Mutual is
subject to claims arising from catastrophes that may have a significant impact
on its results of operations and financial condition. Mercer Mutual has
experienced, and can be expected to experience in the future, catastrophe losses
that may materially affect its financial condition and results of operations.
Catastrophe losses can be caused by various events, including coastal storms,
snow storms, ice storms, freezing, hurricanes, earthquakes, tornadoes, wind,
hail and fires, and their incidence and severity are inherently unpredictable.
The extent of net losses from catastrophes is a function of three factors: the
total amount of insured exposure in the area affected by the event, the severity
of the event and the amount of reinsurance coverage.
 
     Mercer Mutual's financial condition and results of operations also are
affected periodically by losses caused by natural perils, regardless of whether
such losses, because of their magnitude, qualify as "catastrophes" as classified
by the Property Claims Service Division of American Insurance Services Group,
Inc., an insurance industry body. Because of the geographic concentration of its
business, Mercer Mutual may be more exposed to losses of this type than other
property and casualty insurers. The blizzard of January 1996 that adversely
affected Mercer Mutual's results of operations for 1996 is an example of a
"catastrophe." A multiplicity of such events, all or some of which do not
qualify as catastrophes, in the aggregate, may materially affect the Company's
financial condition and results of operations, partly because losses from
individual events may not permit recovery under Mercer Mutual's catastrophe
reinsurance coverage. The frequency and severity of winter storms during 1994
that adversely affected Mercer Mutual's results of operations for such year is
an example of this phenomenon. See "-- Geographic Concentration of Business,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Business -- Reinsurance."
 
POSSIBLE ADVERSE IMPACT DUE TO GEOGRAPHIC CONCENTRATION OF BUSINESS
 
     All direct premiums written by Mercer Mutual are generated in New Jersey
and Pennsylvania. For the years ended December 31, 1995, 1996 and 1997 and the
nine months ended September 30, 1998, 99.3%, 99.1%, 98.7% and 98.5%,
respectively, of Mercer Mutual's direct premiums written were derived from
policies written in New Jersey. As such, Mercer Mutual has a significant
exposure to weather-related property losses, as evidenced by severe winter
storms in New Jersey that were largely responsible for Mercer Mutual's $1.4
million net loss for the year ended December 31, 1994 and that reduced net
income by $665,000 in the year ended December 31, 1996. The revenues and
profitability of Mercer Mutual could be significantly affected by legal and
judicial trends and prevailing economic, regulatory, demographic and other
conditions in New Jersey as well as the impact of catastrophe and natural peril
losses in that state. See "-- Catastrophe and Natural Peril Losses."
 
POSSIBLE ADVERSE IMPACT OF LITIGATION
 
     On February 11, 1997, the affiliated companies of Old Guard Mutual
Insurance Company, Old Guard Mutual Fire Insurance Company and
Goschenhoppen-Home Mutual Insurance Company (the "Old Guard Companies")
completed the first mutual to stock conversions under the Pennsylvania Insurance
Company Mutual to Stock Conversion Act (the "Act"). Since such time, no other
mutual to stock conversions similar to the Conversion have been completed under
the Act. On January 7, 1997, a policyholder of one of the Old Guard Companies
filed an action in the Commonwealth Court of Pennsylvania against the
Pennsylvania Department, the Old Guard Companies and their holding company
seeking, among other things, to have the court (1) declare the Act
unconstitutional, and (2) direct the Pennsylvania Department to rescind its
approval of the conversions (the "Old Guard Policyholder Action"). On July 21,
1997, the Old Guard Policyholder
 
                                       20
<PAGE>   21
 
Action was settled and the litigation terminated without any admissions of
liability or lack of merit of the claims. Under the terms of this settlement,
(i) the Pennsylvania Department implemented certain additional procedures
designed to ensure the dissemination of greater information and disclosure to
policyholders and others; (ii) the Pennsylvania Department agreed to use certain
defined criteria to evaluate whether a hearing should be held on a conversion
plan; (iii) the parties mutually released each other from all claims relating to
the Old Guard Policyholder Action; and (iv) no money or other consideration was
paid by any party to the litigation to any other party to the litigation.
 
     On February 10, 1997, the Old Guard Companies and their holding company and
each of their respective directors were served with an eleven count combination
class action and derivative lawsuit, filed in the United States District Court
for the Eastern District of Pennsylvania (the "Old Guard Class Action")
challenging the constitutionality of the Act, and alleging violations of the Act
and the breach by the directors of the Old Guard Companies of their fiduciary
duties of care and loyalty. The suit seeks compensatory damages as may be
allowed by law, a declaration that the plan of conversion violates the Act and
the United States and Pennsylvania Constitutions and the rights of the
plaintiffs thereunder, and other relief. The holding company for the Old Guard
Companies has stated in its filings under the Exchange Act that the Old Guard
Companies and their directors believe they have meritorious defenses to the
action and intend to defend this action vigorously. The Old Guard Class Action
is still pending.
 
     The Pennsylvania Department has stated that it believes the Act is
constitutional. The Company and Mercer Mutual, based on the advice of their
counsel, believe that it is unlikely that any litigation challenging the
constitutionality of the Act would be successful principally because of (i) the
existence of court decisions that have consistently upheld the constitutionality
of a very similar federal statutory provision providing for the conversion to
stock form of mutual savings and loan associations, pursuant to which over 1,000
mutual to stock conversions have been completed to date, and (ii) a court
decision upholding the constitutionality of a similar Pennsylvania statutory
provision providing for the conversion to stock form of a Pennsylvania mutual
savings bank. However, because of the recent passage of the Act in December 1995
and the settlement of the Old Guard Policyholder Action, no legal precedent
exists directly governing the determination of the claims made in the Old Guard
Class Action.
 
     In May 1998, Franklin Mutual Insurance Company ("Franklin") filed with the
Pennsylvania Department a petition to intervene and request for a full
adjudicatory hearing with respect to all proceedings of the Pennsylvania
Department concerning Mercer Mutual's application for approval of the Plan. The
Orders provide that, in approving the Plan, the Pennsylvania Department
considered Franklin's petition to intervene and request for adjudicatory hearing
as public comments, and not as formal pleadings because formal pleadings are not
required or appropriate in the review of a proposed plan of conversion under the
Act. On October 27, 1998, Franklin filed with the Pennsylvania Department an
appeal of the Orders and a request for a full adjudicatory hearing. On November
6, 1998, the Pennsylvania Department rejected Franklin's appeal because the
Pennsylvania Department had no jurisdiction to entertain such appeal. On
November 9, 1998, Franklin filed a petition for review in the nature of an
appeal with the Pennsylvania Commonwealth Court objecting to and requesting that
such court reverse the Orders (the "Franklin Action"). Such petition is still
pending. See "-- Requirement for Policyholder Approval," "Business -- Offer to
Acquire Mercer Mutual" and "-- Legal Proceedings" and "The
Conversion -- Background and Reasons for the Conversion."
 
     No assurance can be given that the Company or Mercer Mutual will ultimately
prevail in the Franklin Action or in any other litigation that may be commenced
relating to the Conversion. In addition, no assurance can be given that the
Franklin Action, the commencement of any other litigation or the risks
associated therewith would not result in less than the minimum number of shares
of Common Stock being sold, in which case the Conversion would not be
consummated, or that only the minimum number of shares of Common Stock will be
sold, resulting in a sale of Common Stock at the lower end of the Estimated
Valuation Range and reduced net proceeds therefrom.
 
     Mercer Mutual's directors and officers liability insurance policy may not
cover losses, damages, liabilities, and attorneys' fees and other expenses
resulting from any claims made against its directors and officers arising as a
result of the Conversion (collectively, "Director and Officer Liabilities").
Mercer Mutual intends to
 
                                       21
<PAGE>   22
 
indemnify and hold harmless its directors and officers from and against all
Director and Officer Liabilities to the fullest extent permitted by law. Even if
Mercer Mutual is successful on the merits defending its directors and officers
against any such claims, the attorneys' fees and expenses incurred in such a
defense could be material.
 
     If (i) the Act, or any portion of the Act, is declared unconstitutional,
(ii) the Orders are reversed by the Commonwealth Court or (iii) the Conversion
is otherwise declared by a court to be invalid, and the Conversion has yet to be
completed, then the Company would cancel the Offerings and all subscription
funds would be returned to subscribers promptly without interest. If, however,
the Conversion is completed before one of such events occurs, the remedy a court
would grant is uncertain, and is subject to the court's broad discretion. Relief
could be applied on a prospective basis only or on a retroactive basis. No
prediction can be made concerning the remedy a court would fashion in such an
event. However, in the event of any litigation challenging the validity of the
Conversion, two possibilities include:
 
     - A requirement that the Company pay all purchasers of Common Stock, (i)
       the aggregate Purchase Price paid, plus interest, or (ii) the market
       value of the Common Stock sold in the Conversion, less any proceeds
       received by such purchaser from a subsequent sale of such Common Stock;
       or
 
     - The Company could be required to distribute to policyholders of Mercer
       Mutual all or a portion of the surplus of Mercer Mutual as of the date of
       the Conversion (statutory surplus as of September 30, 1998 was $21.3
       million). Such distribution could be required to be made in cash, Common
       Stock or other debt or equity securities. Any required distribution of
       Common Stock or other equity securities would materially dilute the
       interests of existing holders of the Common Stock.
 
No assurance can be given that the Company would have sufficient funds, or the
capacity to borrow sufficient funds, to honor any of its obligations under any
remedy imposed by a court in any litigation. In such event, the Company could be
forced to seek the protection of the bankruptcy laws and Mercer Mutual could be
deemed insolvent and seized by the Pennsylvania Department. In addition, any
litigation could have a material adverse impact on the market price of the
Common Stock during the pendency of the litigation and an adverse determination
of such litigation would have such a material adverse effect.
 
POSSIBLE ADVERSE IMPACT OF BROAD VALUATION RANGE AND ITS USE TO DETERMINE THE
NUMBER OF SHARES OF COMMON STOCK SOLD
 
     If the value set forth in the final updated Appraisal is within the
Estimated Valuation Range, the Conversion can be completed and the Company can
sell between 2,507,500 and 3,392,500 shares of Common Stock. There is a
difference of approximately $8.9 million between the minimum and the maximum of
the Estimated Valuation Range. As a result, the percentage interest in the
Company that a subscriber for a fixed number of shares of Common Stock will have
is approximately 26% smaller if 3,392,500 shares are sold than if 2,507,500
shares are sold. Furthermore, as a result of this broad range, the final updated
Appraisal may estimate a consolidated pro forma market value for Mercer Mutual
as a subsidiary of the Company that is materially more or less than the
aggregate dollar amount of subscriptions received by the Company. Subscribers
will not receive a refund or have any right to withdraw subscriptions if the
updated Appraisal estimates a consolidated pro forma market value that is within
the Estimated Valuation Range, but is less than the aggregate dollar amount of
subscriptions received by the Company. Therefore, subscribers, in the aggregate
and on a per share basis, may pay materially more for the Common Stock than the
estimated consolidated pro forma market value of Mercer Mutual as a subsidiary
of the Company. Accordingly, no assurance can be given that the market price for
the Common Stock immediately following the Conversion will equal or exceed the
Purchase Price.
 
POSSIBLE ADVERSE IMPACT OF NEW JERSEY TAX LAWS
 
     Prior to the Redomestication, Mercer Mutual, as a New Jersey-domiciled
insurance company, paid an annual tax to New Jersey in an amount equal to 2.1%
of 12.5% of the total net direct premiums collected by Mercer Mutual on all
policies of insurance wherever issued and an annual tax to Pennsylvania in an
amount equal to 2.0% of the total net direct premiums collected by Mercer Mutual
on all policies of insurance issued
                                       22
<PAGE>   23
 
to policyholders located in Pennsylvania. For the year ended December 31, 1997,
Mercer Mutual has calculated expenses of approximately $72,000 and $7,000 for
amounts due to New Jersey and Pennsylvania, respectively, pursuant to such
taxes. New Jersey has a statutory retaliatory tax provision that, because Mercer
Mutual is now a Pennsylvania-domiciled insurance company, could be interpreted
to require Mercer Mutual to pay, for all or a portion of 1997 and for all future
years, a tax to New Jersey equal to 2.0% of the total net direct premiums
collected by Mercer Mutual on all policies of insurance issued to policyholders
located in New Jersey. If such interpretation is correct, Mercer Mutual would be
required to pay substantially more in taxes to New Jersey than it has in the
past, which would have a material adverse effect on the results of operations of
Mercer Mutual. Under this interpretation, if the Redomestication had occurred on
January 1, 1997, Mercer Mutual would have been required to pay approximately
$542,000 in taxes to New Jersey for the year ended December 31, 1997, $469,000
more than the amount which has been calculated as due for such year.
 
     No assurance can be given that the New Jersey taxing authorities will not
interpret such retaliatory tax provision in a manner adverse to Mercer Mutual,
and that if so, they would not seek to enforce such retaliatory tax provision
against Mercer Mutual. If enforcement is sought, Mercer Mutual would likely
challenge such enforcement before the appropriate administrative and judicial
authorities, but no assurance can be given that Mercer Mutual would be
successful in such a challenge. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Effect of Conversion and
Redomestication on the Company's Future Financial Condition and Results of
Operations -- State Taxes."
 
POSSIBLE SIGNIFICANT FLUCTUATIONS IN OPERATING RESULTS
 
     The operating results of property and casualty insurers are subject to
significant fluctuation due to a number of factors, including extreme weather
conditions and natural disasters, regulation, competition, judicial trends,
changes in the investment and interest rate environment and general economic
conditions. The Company's operating results may also be affected by changes in
the supply of, and the pricing for, property and casualty insurance and
reinsurance, which historically have been highly cyclical. The unpredictability
of claims experience and the competitive nature of the property and casualty
insurance industry has contributed historically to significant
quarter-to-quarter and year-to-year fluctuations in the underwriting results and
net earnings of Mercer Mutual. Because of these and other factors, historic
results of operations may not be indicative of future operations. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
POSSIBLE ADVERSE IMPACT OF INADEQUATE LOSS RESERVES ON FINANCIAL CONDITION AND
RESULTS OF OPERATION
 
     Mercer Mutual is required to maintain reserves to cover its estimated
ultimate liability for losses and loss adjustment expenses ("LAE") with respect
to reported and unreported claims incurred. Reserves are estimates involving
actuarial and statistical projections at a given time of what Mercer Mutual
expects to be the cost of the ultimate settlement and administration of claims
based on facts and circumstances then known, predictions of future events,
estimates of future trends in claims severity and judicial theories of
liability, legislative activity and other variable factors, such as inflation.
Mercer Mutual's overall reserve practice provides for ongoing claims evaluation
and adjustment (if necessary) based on the development of related data and other
relevant information pertaining to such claims. Loss and LAE reserves, including
reserves for claims that have been incurred but not yet reported, are adjusted
no less frequently than quarterly. The uncertainties of estimating insurance
reserves are greater for certain types of property and casualty insurance lines
written by the Insurance Companies, particularly workers' compensation and other
liability coverages, because a longer period of time may elapse before a
definitive determination of ultimate liability may be made and because of the
changing judicial and political climates relating to these types of claims.
 
     Management believes that Mercer Mutual's reserves for losses and loss
adjustment expenses are adequate and are in accordance with generally accepted
actuarial principles and practices. However, the establishment of appropriate
loss and loss adjustment expense reserves is an inherently uncertain process and
there can be no assurance that ultimate losses will not exceed Mercer Mutual's
loss reserves. To the extent that reserves prove to be inadequate in the future,
Mercer Mutual would have to increase reserves which would adversely affect
                                       23
<PAGE>   24
 
earnings in the period such reserves are increased and could have a material
adverse effect on the Company's results of operations and financial condition.
See "Business -- Loss and LAE Reserves."
 
POSSIBLE ADVERSE OR INADEQUATE IMPACT OF GEOGRAPHIC DIVERSIFICATION STRATEGY
 
     The Company intends to pursue a strategy of growth through the attraction
of new agencies in Pennsylvania and the acquisition of other insurance companies
in Pennsylvania and other jurisdictions. The success of the Company's growth
strategy will depend largely upon its ability to attract new agencies and
successfully market to them, and to identify suitable acquisition candidates and
effect acquisitions at a reasonable cost. No assurance can be given that the
Company will be successful in implementing its growth strategy. Moreover, this
growth strategy may present special risks, such as the risk that Mercer Mutual
will not efficiently integrate an acquisition with present operations, the risk
of dilution of book value and earnings per share of the Common Stock as a result
of an acquisition, the risk that the Company and Mercer Mutual will not be able
to attract and retain qualified personnel needed for expanded operations, and
the risk that internal monitoring and control systems may prove inadequate.
Purchasers of Common Stock should also be aware that the Company, in many
instances, may be able to make an acquisition without shareholder approval.
 
HIGHLY COMPETITIVE NATURE OF INSURANCE INDUSTRY
 
     The property and casualty insurance market is highly competitive.
Competition is based on many factors, including perceived financial strength of
the insurer, premiums charged, policy terms and conditions, service, reputation
and experience. Mercer Mutual competes with stock insurance companies, mutual
companies, local cooperatives and other underwriting organizations. Certain of
these competitors have substantially greater financial, technical and operating
resources than Mercer Mutual. Many of the lines of insurance written by Mercer
Mutual are subject to significant price competition. Some companies may offer
insurance at lower premium rates through the use of salaried personnel or other
methods, rather than the use of agents paid on a commission basis as Mercer
Mutual does. See "Business -- Competition."
 
POSSIBLE ADVERSE IMPACT OF CHANGE IN A.M. BEST RATING
 
     Ratings assigned by A.M. Best Company, Inc. ("A.M. Best") are an important
factor influencing the competitive position of insurance companies. A.M. Best
ratings are based upon factors of concern to policyholders and are not directed
toward the protection of investors. As such, the Insurance Companies' A.M. Best
rating should not be relied upon as a basis for an investment decision to
purchase the Common Stock. A.M. Best affirmed an "A-" (Excellent) rating (its
fourth highest out of 15 rating categories) for the Insurance Companies as a
group in 1998 based on year-end 1997 financial data.
 
     A.M. Best stated in its report that due to the Insurance Companies'
significant catastrophe exposure, their results continue to be heavily
influenced by weather related events. This catastrophe exposure results from the
geographic concentration of the Insurance Companies' business. As a
geographically concentrated insurer, the Insurance Companies are susceptible to
a weather-related event such as a windstorm, a hurricane, hail, a tornado,
freezing temperatures or other extraordinary event. In fact, Mercer Mutual's
exposure to severe weather conditions has been a major factor affecting its
underwriting results since 1991. See "-- Possible Adverse Impact Due to
Geographic Concentration of Business." A.M. Best stated further that as the
Insurance Companies continue to penetrate the commercial market, they will be
subject to such market's increasingly competitive environment. See "-- Highly
Competitive Nature of Insurance Industry" and "Business -- Strategy." Therefore,
there can be no assurance that the Insurance Companies will be able to maintain
their current A.M. Best rating.
 
     Management believes that the Insurance Companies' business is sensitive to
ratings and that a rating downgrade may affect their ability to underwrite new
business. As a result, if the Insurance Companies were to experience a rating
downgrade, the independent agents that sell the Insurance Companies' products
could be inclined to place their customers with higher-rated insurance carriers,
which could have a material adverse effect on the Company's business and results
of operations.
 
                                       24
<PAGE>   25
 
     Management met with A.M. Best personnel in February 1997 and September 1998
to discuss the measures the Insurance Companies are implementing to reduce the
risk caused by their exposure to severe weather conditions and preserve their
A.M. Best Rating. These measures include an increase in the rates charged for
homeowners insurance, the termination of their relationships with unprofitable
agencies, decreasing their catastrophe exposure by improving the Insurance
Companies' mix of business through an increase in commercial and casualty
writings, the planned geographic diversification of business through the
acquisition of other insurance companies, and the planned improvement of capital
strength through the Conversion and the Offerings. Each of these measures is in
various stages of implementation. See "Business -- A.M. Best Rating."
 
RELIANCE ON KEY AGENCIES AND PRODUCT LINES
 
     For the nine months ended September 30, 1998 and the year ended December
31, 1997, the Insurance Companies' largest agency accounted for approximately
7.6% and 7.3%, respectively, of the Insurance Companies' direct premiums
written, and generated approximately $1.7 million and $2.1 million,
respectively, in premium revenue for the Insurance Companies. For the nine
months ended September 30, 1998 and the year ended December 31, 1997, the
Insurance Companies' 10 largest agencies accounted for 31.0% and 26.8%,
respectively, of direct premiums written. A significant decrease in business
from, or the loss of, its largest agency or several of its other large agencies
would have a material adverse effect on the Company. Furthermore, the Insurance
Companies' largest agency has written a significant portion of its business with
religious institutions using a specialized multi-peril policy specially designed
by Mercer Mutual for this market segment. See
"Business -- Products -- Commercial Multi-Peril Products -- Religious
Institutions." Decisions by such institutions to discontinue certain coverages
or to emphasize certain coverages over others, and any inability of Mercer
Mutual to offer such coverages at a price satisfactory to such institutions may
have a material adverse effect on the Company.
 
POSSIBLE ADVERSE IMPACT OF REGULATORY CHANGES
 
     The Insurance Companies are subject to substantial regulation by government
agencies in the states in which they do business. Such regulation usually
includes (i) regulating premium rates, policy forms, and lines of business, (ii)
setting minimum capital and surplus requirements, (iii) imposing guaranty fund
assessments and requiring residual market participation, (iv) licensing
companies and agents, (v) approving accounting methods and methods of setting
loss and expense reserves, (vi) setting requirements for and limiting the types
and amounts of investments, (vii) establishing requirements for the filing of
annual statements and other financial reports, (viii) conducting periodic
statutory examinations of the affairs of insurance companies, (ix) approving
proposed changes in control, (x) limiting the amount of dividends that may be
paid without prior notice or approval, (xi) regulating transactions with
affiliates, and (xii) regulating trade practices and market conduct. Such
regulation and supervision are primarily for the benefit and protection of
policyholders and not for the benefit of investors. The insurance regulatory
structure has been subject to increased scrutiny in recent years by federal and
state legislative bodies and state regulatory authorities.
 
     In 1990, the National Association of Insurance Commissioners (the "NAIC")
began an accreditation program to ensure that states have adequate procedures in
place for effective insurance regulation, especially with respect to financial
solvency. The accreditation program requires that a state meet specific minimum
standards in over five regulatory areas to be considered for accreditation. The
accreditation program is an ongoing process and once accredited, a state must
enact any new or modified standards approved by the NAIC within two years
following adoption. As of September 30, 1998, Pennsylvania and New Jersey, the
states in which Mercer Mutual and MIC, respectively, are domiciled, were
accredited.
 
     The NAIC has adopted risk-based capital ("RBC") requirements that require
insurance companies to calculate and report information under a risk-based
formula that attempts to measure statutory capital and surplus needs based on
the risks in a company's mix of products and investment portfolio. The formula
is designed to allow state insurance regulators to identify weakly capitalized
companies. The RBC requirements provide for four different levels of regulatory
attention in the event of noncompliance with required capital levels, which
range from a requirement to file a corrective plan of action to mandatory
seizure. Neither of the
                                       25
<PAGE>   26
 
Insurance Companies has ever failed to meet the required levels of capital.
There can be no assurance, however, that the capital requirements applicable to
the respective businesses of the Insurance Companies will not increase in the
future, or that the Insurance Companies will continue to meet these
requirements.
 
     The NAIC has also developed a set of eleven financial ratios, referred to
as the Insurance Regulatory Information System ("IRIS"), for use by state
insurance regulators in monitoring the financial condition of insurance
companies. The NAIC has established an acceptable range of values for each of
the eleven IRIS financial ratios. Generally, an insurance company will become
the subject of increased scrutiny when four or more of its IRIS ratios fall
outside the range deemed acceptable by the NAIC. The nature of increased
regulatory scrutiny resulting from IRIS ratios that are outside the acceptable
range is subject to the judgment of the applicable state insurance department,
but generally will result in accelerated review of annual and quarterly filings.
Depending on the nature and severity of the underlying cause of the IRIS ratios
being outside the acceptable range, increased regulatory scrutiny could range
from increased but informal regulatory oversight to placing a company under
regulatory control. During the years ended December 31, 1995 and 1996, each of
the Insurance Companies reported two ratios outside the acceptable range for
certain IRIS tests. However, neither of the Insurance Companies had four or more
IRIS ratios outside the acceptable range and, to their knowledge, neither of the
Insurance Companies is subject to increased regulatory scrutiny. During the year
ended December 31, 1997, neither Insurance Company reported any ratio outside
the acceptable IRIS range. See "Business -- Regulation."
 
     No assurance can be given that future legislation or regulatory changes
will not adversely affect the business and results of operations of the
Insurance Companies. See "Business -- Regulation."
 
     Adverse legislative and regulatory activity constraining the Insurance
Companies' ability to price adequately workers' compensation and other insurance
coverages may occur in the future. In recent years, insurers have been under
pressure from regulators, legislatures and special interest groups to reduce,
freeze or set workers' compensation insurance rates at levels that may not
correspond with current underlying costs. Any such required rate levels could
have a material adverse effect on the Company's business and results of
operations.
 
DEPENDENCE UPON DIVIDENDS FROM INSURANCE COMPANIES
 
     Because the operations of the Company following the Conversion will be
conducted through the Insurance Companies, after the Company deploys the net
proceeds of the Offerings, it will be dependent upon dividends and other
payments from Mercer Mutual for funds to meet its obligations. The Pennsylvania
Department's approval of the Conversion is subject to, among other things, the
condition that for a period of three years following the Conversion, Mercer
Mutual may not declare or pay any dividend to the Company without the
Pennsylvania Department's prior approval. In addition, state law regulates the
distribution of dividends and other payments by Mercer Mutual to the Company and
by MIC to Mercer Mutual. Such restrictions or any subsequently imposed
restrictions may in the future affect the Company's ability to pay debt,
expenses and cash dividends. See "Dividend Policy" and "Business -- Regulation."
 
AVAILABILITY AND ADEQUACY OF REINSURANCE
 
     The Insurance Companies' insurance operations rely on the use of
reinsurance arrangements to limit and manage the amount of risk retained, to
stabilize underwriting results and increase underwriting capacity. The
availability and cost of reinsurance are subject to prevailing market conditions
and may vary significantly over time. No assurance can be given that reinsurance
will continue to be available to the Insurance Companies in the future at
commercially reasonable rates. While the Insurance Companies seek to obtain
reinsurance with coverage limits that they believe are appropriate for the risk
exposures assumed, there can be no assurance that losses experienced by the
Insurance Companies will be within the coverage limits of their reinsurance
treaties and facultative arrangements. During 1997 and 1998, the Company has
reduced its reliance on reinsurance by increasing the maximum exposure retained
by the Insurance Companies on individual property and casualty risks. The
Company may further increase such maximum exposure in the future. The Company
will rely, in part, on the additional capital raised in the Conversion to
protect itself in the event of individual
 
                                       26
<PAGE>   27
 
property losses up to the increased maximum exposure amounts under its
reinsurance agreements. The Company's maximum exposure will be adjusted by the
Company from time to time based on the amount of capital raised in the
Conversion, the Company's evaluation of its ability to incur multiple losses
without a corresponding material adverse effect on its future financial
condition and results of operations, and negotiations with its reinsurers.
 
     The decrease in reinsurance will increase the Company's risk of loss. The
Insurance Companies also are subject to credit risk with respect to their
reinsurers because the ceding of risk to reinsurers does not relieve the
Insurance Companies of their liability to insureds. The insolvency or inability
of any reinsurer to meet its obligations may have a material adverse effect on
the business and results of operations of the Company. See
"Business -- Strategy" and "-- Reinsurance."
 
RELIANCE ON EXISTING MANAGEMENT
 
     The operations of the Company and the Insurance Companies are largely
dependent on existing management. The loss to the Company or the Insurance
Companies of one or more of their existing executive officers could have a
material adverse effect on the Company's business and results of operations. The
Company and Mercer Mutual have entered into employment agreements with four of
their five executive officers, including their chief executive officer and chief
operating and chief financial officer. See "Management of the
Company -- Executive Officers" and "-- Certain Benefit Plans and Agreements."
 
POTENTIAL BENEFITS OF CONVERSION TO MANAGEMENT AND IMPACT OF PURCHASES BY
MANAGEMENT AND STOCK BENEFIT PLANS
 
     It is currently expected that directors and executive officers of the
Insurance Companies and their associates will subscribe for approximately
186,000 shares of the Common Stock to be issued in the Conversion, or 7.4%
thereof at the Total Minimum of the Estimated Valuation Range, and that the ESOP
will purchase 10% of the shares to be issued in the Conversion. In addition,
following the Conversion, and subject to shareholder approval, the Company
intends to implement the MRP and the Compensation Plan. At the Total Minimum,
Total Midpoint and Total Maximum, assuming that all options that may be granted
under the Compensation Plan are granted and exercised, such persons would
receive under the MRP and the Stock Compensation Plan, in the aggregate,
351,050, 413,000 and 474,950 shares, respectively, or in each case, 12.7% of the
Common Stock issued in the Conversion and outstanding after such issuance and
exercise. In addition to the possible financial benefits under the ESOP, MRP and
Compensation Plan, management could benefit from certain statutory and
regulatory provisions, as well as certain provisions in the Company's Articles
of Incorporation and Bylaws, that may tend to promote the continuity of existing
management and discourage certain acquisition proposals.
 
     As a result of the foregoing, management could acquire a substantial
interest in the Company and, if each member of management were to act
consistently with each other, could have significant influence over the outcome
of the election of directors and any other shareholder vote, especially a vote
on matters requiring the approval of 80% of the outstanding Common Stock, such
as certain business combinations. Management might thus have the power to
authorize actions that may be viewed as contrary to the best interests of non-
affiliated holders of Common Stock and might have substantial power to block
actions that such holders may deem to be in their best interests. See "Pro Forma
Data," "Management -- Certain Benefit Plans and Agreements," "The
Conversion -- Proposed Management Purchases," and "Certain Restrictions on
Acquisition of the Company."
 
REQUIREMENT FOR POLICYHOLDER APPROVAL
 
     The Conversion is contingent upon the approval of the Plan by the Eligible
Policyholders. Approval of the Plan will require the affirmative vote, either in
person or by proxy, of at least two-thirds of the votes cast by the Eligible
Policyholders. Each Eligible Policyholder is entitled to one vote. The Special
Meeting has been scheduled for March 3, 1999 for the purpose of considering and
voting on the Plan. Mercer Mutual's Board of Directors is unanimously
recommending to the Eligible Policyholders that they vote in favor of the Plan.
 
                                       27
<PAGE>   28
 
     On March 3, 1998, Mercer Mutual received an unsolicited offer from
Franklin, an Eligible Policyholder, to purchase from Mercer Mutual, upon the
consummation of the Conversion, all of the to-be-issued capital stock of Mercer
Mutual for a purchase price equal to the audited book value of Mercer Mutual at
December 31, 1997 under generally accepted accounting principles. Mercer
Mutual's Board of Directors unanimously rejected such offer. See
"Business -- Offer to Acquire Mercer Mutual."
 
     Franklin has requested and received access to Mercer Mutual's list of all
Eligible Policyholders for the purpose of communicating with Eligible
Policyholders concerning the Plan. Mercer Mutual had opposed such request on the
basis that Franklin's intended purposes for requesting a list of Eligible
Policyholders were (i) to solicit opposition to the Plan so that the Conversion
would not be approved by the Eligible Policyholders and Mercer Mutual, a
competitor of Franklin, would not be able to complete the Conversion and become
a stronger competitor, and (ii) to use the list to make an offer for the stock
of Mercer Mutual that violates applicable insurance holding company laws.
Franklin also could use the list to communicate and market Franklin and its
insurance products directly to Mercer Mutual's policyholders. However, a
Pennsylvania court ordered Mercer Mutual to deliver the policyholder list to a
third party mailer designated by Franklin. The mailer will mail Franklin's
communications to Mercer Mutual policyholders but is prohibited from disclosing
the list to Franklin or any other person.
 
     Franklin has already mailed several communications to Mercer Mutual
policyholders and has indicated to Mercer Mutual that it intends to solicit
proxies in opposition to the Plan. Mercer Mutual will actively solicit proxies
in favor of the Plan. If, however, as a result of Franklin's efforts in
opposition to the Plan or otherwise, the Eligible Policyholders fail to approve
the Plan at the Special Meeting, the Company will cancel the Offerings and all
subscription funds will be returned promptly to subscribers without interest. In
such event, Mercer Mutual would maintain and continue its existence as an
independent property and casualty insurance company.
 
RISK OF DELAYED OFFERING
 
     The Company and Mercer Mutual expect to complete the Conversion within the
time periods indicated in this Prospectus. Nevertheless, it is possible,
although not anticipated, that adverse market, economic or regulatory
conditions, delays in obtaining the required policyholder approval of the Plan
caused by Franklin or otherwise, or other factors could significantly delay the
completion of the Conversion and result in increased Conversion costs or in
changes in the Estimated Valuation Range. The Conversion Offerings could be
extended to April 11, 1999. The Company will have 45 days after the completion
of the Conversion Offerings to complete the Conversion. If the Conversion is not
completed within such 45-day period, or in any event by May 26, 1999, the
Offerings will be terminated and all funds held will be promptly returned
without interest. See "The Conversion -- The Conversion Offerings" and
"-- Purchases in the Conversion Offerings."
 
DILUTIVE EFFECT OF STOCK OPTIONS AND MRP
 
     The Compensation Plan and the MRP will be subject to shareholder approval
at the Company's first annual meeting of shareholders to be held after the
Conversion. The Company anticipates that, if approved, these plans would be
implemented as soon as practicable after such meeting. Because the shares of
Common Stock issued pursuant to the exercise of options granted under the
Compensation Plan would consist of newly issued shares, upon the exercise of
options granted under the Compensation Plan, the interests of existing
shareholders would be diluted. The total number of shares that could be issued
pursuant to the exercise of options granted under the Compensation Plan would be
an amount equal to 10% of the Common Stock issued in the Conversion. In
addition, in lieu of purchasing shares of Common Stock for the MRP in the open
market, the Company may issue authorized but unissued shares of Common Stock to
the MRP. The total number of shares that could be issued to the MRP would be an
amount equal to 4% of the Common Stock issued in the Conversion. Such newly
issued shares would dilute the interests of existing shareholders. See
"-- Potential Benefits of Conversion to Management and Impact of Purchases by
Management and Stock Benefit Plans," "Pro Forma Data" and "Management -- Certain
Benefit Plans and Agreements -- Stock Compensation Plan" and "-- Management
Recognition Plan."
 
                                       28
<PAGE>   29
 
ARTICLES OF INCORPORATION, BYLAW AND STATUTORY PROVISIONS THAT COULD DISCOURAGE
HOSTILE ACQUISITIONS OF THE COMPANY
 
     The Company's Articles of Incorporation and Bylaws contain certain
provisions that may have the effect of discouraging a non-negotiated tender or
exchange offer for the Common Stock, a proxy contest for control of the Company,
the assumption of control of the Company by a holder of a large block of Common
Stock or the removal of the Company's management, all of which certain
shareholders might deem to be in their best interests. These provisions include,
among other things (i) the classification of the terms of the members of the
Board of Directors, (ii) supermajority provisions for the approval of certain
business combinations and the amendment of the Articles of Incorporation or
Bylaws of the Company, (iii) elimination of cumulative voting in the election of
directors, and (iv) restrictions on the voting of the Company's equity
securities by any individual, entity or group owning more than 10% of the Common
Stock. The provisions in the Company's Articles of Incorporation requiring a
supermajority vote for the approval of certain business combinations and
containing restrictions on voting of the Company's equity securities provide
that the supermajority voting requirements and voting restrictions do not apply
to business combinations and acquisitions of Common Stock meeting specified
Board of Directors' approval requirements. The Articles of Incorporation also
authorize the issuance of 5,000,000 shares of preferred stock as well as
additional shares of Common Stock. Under certain circumstances, these shares or
rights to acquire these shares could be issued at any time without shareholder
approval on terms or in circumstances that could deter a future takeover
attempt.
 
     In addition, the Pennsylvania Business Corporation Law (the "Pennsylvania
BCL") provides for certain restrictions on the acquisition of the Company, and
Pennsylvania law contains various restrictions on acquisitions of control of
insurance holding companies.
 
     The Articles of Incorporation, Bylaw and statutory provisions, as well as
certain other provisions of state and federal law, may have the effect of
discouraging or preventing a future takeover attempt not supported by the
Company's Board of Directors in which shareholders of the Company otherwise
might receive a substantial premium for their shares over then-current market
prices. For a detailed discussion of those provisions, see
"Management -- Certain Benefit Plans and Agreements," "Certain Restrictions on
Acquisition of the Company," "Certain Anti-Takeover Provisions in the Articles
of Incorporation and Bylaws" and "Description of Capital Stock."
 
POSSIBLE ADVERSE INCOME TAX CONSEQUENCES OF THE DISTRIBUTION OF SUBSCRIPTION
RIGHTS
 
     If the subscription rights granted to Eligible Policyholders are deemed to
have an ascertainable value, receipt of such rights could result in taxable gain
to those Eligible Policyholders who receive or exercise the subscription rights,
in an amount equal to such value. Whether subscription rights are considered to
have ascertainable value is an inherently factual determination. Mercer Mutual
has been advised by Sheshunoff that the subscription rights granted to Eligible
Policyholders have no value. However, Sheshunoff's conclusion is not binding on
the Internal Revenue Service ("IRS"). See "The Conversion -- Effects of
Conversion on Policyholders" and "-- Tax Effects."
 
ABSENCE OF PRIOR MARKET FOR THE COMMON STOCK
 
     The Company has never issued capital stock, and consequently there is no
established market for the Common Stock. The Company has received approval to
have the Common Stock quoted on the Nasdaq National Market under the symbol
"MRCR," subject to completion of the Conversion. However, there can be no
assurance that an active and liquid trading market for the Common Stock will
develop or that, if one develops, it will continue, nor is there any assurance
that persons purchasing Common Stock will be able to sell the Common Stock at or
above the Purchase Price. See "Market for the Common Stock."
 
                                       29
<PAGE>   30
 
                                USE OF PROCEEDS
 
     The Company has received Pennsylvania Department approval to contribute
$5.0 million of net proceeds from the Offerings to Mercer Mutual in exchange for
all of its capital stock. The Company will retain the balance of the net
proceeds, from which it will fund a loan to the ESOP in the amount necessary to
purchase 10% of the shares of Common Stock sold in the Offerings (the "ESOP
Loan"). The amount of the ESOP Loan may range from $2.5 million to $3.8 million
based on a sale of 250,750 shares to the ESOP (at the Total Minimum) and 376,944
shares to the ESOP (at the Total Maximum plus the shares sold to the ESOP),
respectively, at the Purchase Price. It is anticipated that the ESOP Loan will
have a ten year term with interest payable at the prime rate as published in The
Wall Street Journal on the closing date of the Conversion. The ESOP Loan will be
repaid principally from Mercer Mutual's contributions to the ESOP and from any
dividends paid on the unallocated shares of Common Stock held by the ESOP. See
"Management of the Company -- Certain Benefit Plans and Agreements -- Employee
Stock Ownership Plan."
 
     On a short-term basis, the remaining net proceeds retained by the Company
will be invested primarily in U.S. government securities and other federal
agency securities. The net proceeds retained by the Company will be available
for a variety of corporate purposes, including additional capital contributions,
future acquisitions and diversification of business, and dividends to
shareholders. The Company also may use a portion of the net proceeds of the
Offerings to fund the purchase by the MRP, if implemented, in the open market of
all or a portion of the shares of Common Stock to be acquired by the MRP.
Implementation of the MRP requires shareholder approval, which is expected to be
sought at the first annual meeting of shareholders to be held no earlier than
six months following the Conversion. See "Management of the Company -- Certain
Benefit Plans and Agreements -- Management Recognition Plan."
 
     The net proceeds used to acquire the stock of Mercer Mutual will become
part of Mercer Mutual's capital, thereby expanding underwriting capacity and
permitting diversification of its business. Mercer Mutual may contribute a
portion of the net proceeds it receives from the Company to MIC in connection
with MIC's planned expansion of its New Jersey business to include the same
types of insurance currently written by Mercer Mutual. Any payment of dividends
by Mercer Mutual to the Company and by MIC to Mercer Mutual will be limited by
state regulatory restrictions on capital distributions. Further, the Orders
require the approval of the Pennsylvania Department prior to the payment of any
dividends by Mercer Mutual to the Company or by the Company to its shareholders,
during the three year period following the Conversion. See "Business --
Regulation."
 
     With the exception of the ESOP Loan, the capital contributions to Mercer
Mutual and possibly to MIC, and the possible funding of the MRP, the Company and
Mercer Mutual currently have no specific plans, arrangements or understandings
regarding the use of the net proceeds from the Offerings. See "Dividend Policy"
and "Management of the Company -- Certain Benefit Plans and
Agreements -- Employee Stock Ownership Plan" and "-- Management Recognition
Plan."
 
     The amount of proceeds from the sale of Common Stock in the Offerings will
depend upon the total number of shares actually sold, the relative percentages
of Common Stock sold in the Subscription, Community and Syndicated Community
Offerings and the actual expenses of the Conversion. As a result, the net
proceeds from the sale of Common Stock cannot be determined until the Conversion
is completed. Set forth below are the estimated net proceeds to the Company,
assuming the sale of Common Stock at the Total Minimum, Total Midpoint and Total
Maximum, and at the Total Maximum plus the shares to be issued to the ESOP,
based upon the following assumptions: (i) shares of Common Stock will be sold as
follows: (a)(1) 10% of the shares will be sold to the ESOP and (2) 186,000
shares will be sold to the directors, officers and employees of the Company and
Mercer Mutual, with respect to which no commission will be paid to Sandler
O'Neill and (b) the remaining shares will be sold to Eligible Policyholders and
the community with respect to which the Company will pay a 2.0% commission to
Sandler O'Neill; (ii) the purchase of the shares sold to the ESOP will be
financed with the proceeds of the ESOP Loan from the Company; and (iii) other
Conversion expenses, not including sales commissions, will be approximately $1.6
million. The foregoing assumption that all shares will be purchased in the
Subscription Offerings is illustrative only and is based upon one (and the only)
recent comparable transaction. Actual expenses may vary from those estimated.
 
                                       30
<PAGE>   31
 
<TABLE>
<CAPTION>
                                                                                          TOTAL
                                              TOTAL          TOTAL         TOTAL       MAXIMUM OF
                                            MINIMUM OF    MIDPOINT OF    MAXIMUM OF     3,392,500
                                            2,507,500      2,950,000     3,392,500      SHARES AT
                                            SHARES AT      SHARES AT     SHARES AT     $10.00 PER
                                              $10.00        $10.00         $10.00      SHARE PLUS
                                            PER SHARE      PER SHARE     PER SHARE     ESOP SHARES
                                            ----------    -----------    ----------    -----------
                                                               (IN THOUSANDS)
<S>                                         <C>           <C>            <C>           <C>
Gross proceeds of Offerings...............   $25,075        $29,500       $33,925        $37,694
  Less estimated expenses, including
     underwriting fees....................    (2,070)        (2,150)       (2,229)        (2,297)
                                             -------        -------       -------        -------
Estimated net proceeds....................    23,005         27,350        31,696         35,397
Less:
  Common Stock to be acquired by ESOP.....    (2,508)        (2,950)       (3,393)        (3,769)
                                             -------        -------       -------        -------
Estimated net proceeds, as adjusted(1)....   $20,497        $24,400       $28,303        $31,628
                                             =======        =======       =======        =======
</TABLE>
 
- ---------------
 
(1) Does not include any adjustment for the portion of the estimated net
    proceeds of the Offerings which may be used to fund the purchase by the MRP,
    if implemented, of shares of Common Stock in the open market because (i) the
    implementation of the MRP is subject to shareholder approval, (ii) any such
    implementation would not occur until at least six months after the
    consummation of the Conversion and, therefore, the Company is unable to
    predict with any certainty the market price of the Common Stock at that
    time, (iii) the Company may fund a portion of the costs of such purchase
    from its cash flow, and (iv) the Company may issue new shares directly to
    the MRP in lieu of purchasing shares in the open market.
 
                                DIVIDEND POLICY
 
     Payment of dividends on the Common Stock is subject to determination and
declaration by the Company's Board of Directors. Any dividend policy of the
Company will depend upon the financial condition, results of operations and
future prospects of the Company. In addition, the Orders prohibit the Company
from declaring or paying any dividends during the three years following the
Conversion, unless such dividends are approved by the Pennsylvania Department.
At present, the Company has not made any determination as to whether it intends
to pay dividends to its shareholders in the foreseeable future. There can be no
assurance that dividends will be paid or, if approved by the Department and paid
initially, that they will continue to be paid in the future. In addition,
because the Company initially will have no significant source of income other
than dividends from Mercer Mutual and earnings from the repayment of the ESOP
Loan and the investment of the net proceeds of the Conversion retained by the
Company, the payment of dividends by the Company will depend significantly upon
receipt of dividends from Mercer Mutual. The Orders prohibit Mercer Mutual from
declaring or paying any dividends during the three years following the
Conversion, unless such dividends are approved by the Pennsylvania Department.
No assurance can be given that the Pennsylvania Department will approve the
declaration or payment by Mercer Mutual of any dividends to the Company. See
"Business -- Regulation."
 
     Except as described above, the Company is not subject to regulatory
restrictions on the payment of dividends to shareholders. The Company is subject
to the requirements of the Pennsylvania BCL, which generally permits dividends
or distributions to be paid as long as, after making the dividend or
distribution, the Company will be able to pay its debts in the ordinary course
of business and the Company's total assets will exceed its total liabilities
plus the amount that would be needed to satisfy the preferential rights upon
dissolution of holders of stock with senior liquidation rights if the Company
were to be dissolved at the time the dividend or distribution is paid.
 
                                       31
<PAGE>   32
 
                          MARKET FOR THE COMMON STOCK
 
     The Common Stock has been approved for quotation on the Nasdaq National
Market under the symbol "MRCR," subject to the completion of the Conversion.
 
     The Company has never issued any capital stock. Consequently, there is no
established market for the Common Stock. The development of a public market
having the desirable characteristics of depth, liquidity and orderliness,
however, depends upon the presence in the marketplace of a sufficient number of
willing buyers and sellers at any given time, over which neither the Company nor
any market maker has any control. Accordingly, there can be no assurance that an
established and liquid market for the Common Stock will develop, or if one
develops, that it will continue. Sandler O'Neill has advised the Company that it
intends to make a market in the Common Stock following the Conversion, but it is
under no obligation to do so. One of the requirements for continued quotation of
the Common Stock on the Nasdaq National Market is that there be at least two
market makers for the Common Stock. There can be no assurance that there will be
two or more market makers for the Common Stock. Furthermore, there can be no
assurance that purchasers will be able to resell their shares of Common Stock at
or above the Purchase Price, or that quotations will be available on the Nasdaq
National Market, as contemplated.
 
                                       32
<PAGE>   33
 
                                 CAPITALIZATION
 
     The following table sets forth information regarding the consolidated
historical capitalization of Mercer Mutual and its subsidiaries at September 30,
1998 and the pro forma consolidated capitalization of the Company giving effect
to the sale of Common Stock at the Total Minimum, Total Midpoint and Total
Maximum of the Estimated Valuation Range, and at the Total Maximum of the
Estimated Valuation Range plus the shares to be issued to the ESOP in an amount
equalling 10% of the shares issued in the Conversion, based upon the assumptions
set forth under "Use of Proceeds." For additional financial information
regarding Mercer Mutual, see the Consolidated Financial Statements and related
Notes appearing elsewhere herein. Depending on market and financial conditions,
the total number of shares to be issued in the Conversion will range from
2,507,500 shares to 3,769,444 shares. See "Use of Proceeds" and "The
Conversion -- Stock Pricing and Number of Shares to be Issued."
 
<TABLE>
<CAPTION>
                                                            PRO FORMA CONSOLIDATED CAPITALIZATION OF THE
                                                                    COMPANY BASED ON THE SALE OF
                                                          -------------------------------------------------
                                          HISTORICAL                                             3,392,500
                                         CONSOLIDATED                                            SHARES AT
                                        CAPITALIZATION                                             $10.00
                                          OF MERCER       2,507,500    2,950,000    3,392,500       PER
                                          MUTUAL AT       SHARES AT    SHARES AT    SHARES AT    SHARE PLUS
                                        SEPTEMBER 30,      $10.00       $10.00       $10.00         ESOP
                                             1998         PER SHARE    PER SHARE    PER SHARE      SHARES
                                        --------------    ---------    ---------    ---------    ----------
                                                                  (IN THOUSANDS)
<S>                                     <C>               <C>          <C>          <C>          <C>
Long term debt........................          --             --           --           --            --
Shareholders' equity(1):
  Preferred stock, authorized
     5,000,000 shares; 0 shares
     outstanding......................          --             --           --           --            --
  Common stock, no par value per
     share: authorized -- 15,000,000
     shares; shares to be
     outstanding -- as shown(2).......          --         23,005       27,350       31,696        35,397
  Retained earnings...................      22,655         22,655       22,655       22,655        22,655
  Unrealized gains....................       3,181          3,181        3,181        3,181         3,181
Less:
  Common stock to be acquired by
     ESOP(3)..........................          --         (2,508)      (2,950)      (3,393)       (3,769)
                                            ------         ------       ------       ------        ------
          Total(4)....................      25,836         46,333       50,236       54,139        57,464
                                            ======         ======       ======       ======        ======
</TABLE>
 
- ---------------
(1) Pro forma shareholders' equity is not intended to represent the fair market
    value of the Common Stock, the net fair market value of the Company's assets
    and liabilities or the amounts, if any, that would be available for
    distribution to shareholders in the event of liquidation. Such pro forma
    data may be materially affected by a change in the number of shares to be
    sold in the Conversion and by other factors.
 
(2) Does not reflect additional shares of Common Stock that could be purchased
    pursuant to the Compensation Plan, if implemented, under which directors,
    executive officers and other employees of the Company would be granted
    options to purchase an aggregate amount of Common Stock equal to 10% of the
    shares issued in the Conversion (250,750, 295,000, 339,250 and 376,944
    shares at the Total Minimum, Total Midpoint, Total Maximum and Total Maximum
    plus ESOP shares, respectively). Implementation of the Compensation Plan
    requires shareholder approval, which is expected to be sought at the first
    annual meeting of shareholders to be held no earlier than six months
    following the Conversion. See "Risk Factors -- Dilutive Effect of Stock
    Options" and "Management of the Company -- Certain Benefit Plans and
    Agreements -- Stock Compensation Plan."
 
(3) Assumes that 10% of the shares of Common Stock to be sold in the Conversion
    are purchased by the ESOP, and that the funds used to purchase such shares
    are borrowed from the Company. Under GAAP, the aggregate Purchase Price of
    shares of Common Stock to be purchased by the ESOP in the Offerings
    represents unearned compensation and is, accordingly, reflected as a
    reduction of capital. As the ESOP Loan is repaid, shares are released and
    allocated to ESOP participants' accounts, and a corresponding
 
                                       33
<PAGE>   34
 
    reduction in the charge against capital will occur. See "Pro Forma Data" and
    "Management of the Company -- Certain Benefit Plans and
    Agreements -- Employee Stock Ownership Plan."
 
(4) Does not reflect any adjustments to shareholders' equity that would result
    from the implementation of the MRP because (i) of the total shares of Common
    Stock to be acquired by the MRP, an undetermined portion may be newly issued
    shares and an undetermined portion may be purchased in the open market, each
    of which methods and amounts would have different and varying effects on the
    Company's shareholders' equity, (ii) the implementation of the MRP is
    subject to shareholder approval, (iii) any such implementation would not
    occur until at least six months after the consummation of the Conversion
    and, therefore, the Company is unable to predict with any certainty the
    market price of the Common Stock at that time, and (iv) the Company may fund
    a portion of the costs of any open-market purchase of shares from its then
    current cash flow. See "Management of the Company -- Certain Benefit Plans
    and Agreements -- Management Recognition Plan."
 
                                 PRO FORMA DATA
 
     The following pro forma condensed consolidated balance sheet as of
September 30, 1998 gives effect to the Conversion and implementation of the ESOP
as if they had occurred as of September 30, 1998 and assumes that 2,507,500
shares of Common Stock (the minimum number of such shares required to be sold)
are sold in the Subscription Offering. The following pro forma condensed
consolidated statements of income for the year ended December 31, 1997 and the
nine months ended September 30, 1998 present consolidated operating results for
Mercer Mutual and its subsidiaries as if the Conversion and implementation of
the ESOP had occurred as of January 1, 1997. Pursuant to the Plan, Mercer Mutual
will convert from a Pennsylvania-chartered mutual insurance company to a
Pennsylvania-chartered stock insurance company and simultaneously issue shares
of its capital stock to the Company in exchange for a portion of the net
proceeds from the sale of Common Stock in the Offerings. The Conversion will be
accounted for as a simultaneous reorganization, recapitalization and share
offering which will not change the historical accounting basis of Mercer
Mutual's consolidated financial statements. Completion of the Conversion is
contingent on the sale of a minimum of 2,507,500 shares of Common Stock. If less
than 2,507,500 shares of Common Stock are subscribed for in the Conversion
Offerings, the remaining shares, up to a maximum of 3,392,500 shares (not
including shares sold to the ESOP), will be offered in the Syndicated Community
Offering.
 
     The unaudited pro forma information does not purport to represent what
Mercer Mutual's consolidated financial position or results of operations
actually would have been had the Conversion and implementation of the ESOP
occurred on the dates indicated, or to project Mercer Mutual's consolidated
financial position or results of operations for any future date or period. The
pro forma adjustments are based on available information and certain assumptions
that Mercer Mutual believes are factually supportable and reasonable under the
circumstances. The unaudited pro forma consolidated financial information should
be read in conjunction with the accompanying notes thereto, and the other
consolidated financial information pertaining to Mercer Mutual included
elsewhere in this Prospectus.
 
     The pro forma adjustments and pro forma consolidated amounts are provided
for informational purposes only. Mercer Mutual's consolidated financial
statements will reflect the effects of the Conversion and implementation of the
ESOP only from the dates such events occur.
 
                                       34
<PAGE>   35
 
            UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                            AS OF SEPTEMBER 30, 1998
 
<TABLE>
<CAPTION>
                                                        HISTORICAL                       PRO FORMA
                                                       CONSOLIDATED    ADJUSTMENTS    CONSOLIDATED(4)
                                                       ------------    -----------    ---------------
                                                                       (IN THOUSANDS)
<S>                                                    <C>             <C>            <C>
ASSETS
Investments:
  Fixed income securities............................    $36,074         $20,497(1)       $56,571
  Equity securities..................................     12,867                           12,867
                                                         -------         -------          -------
  Total investments..................................     48,941          20,497           69,438
Cash and cash equivalents............................      7,035                            7,035
Receivables..........................................     12,985                           12,985
Prepaid reinsurance premiums.........................        479                              479
Deferred policy acquisition costs, and other
  assets.............................................      7,279                            7,279
                                                         -------         -------          -------
Total assets.........................................    $76,719         $20,497          $97,216
                                                         =======         =======          =======
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities:
  Losses and loss adjustment expenses................    $$30,331                         $30,331
  Unearned premiums..................................     15,780                           15,780
  Other liabilities..................................      4,772                            4,772
                                                         -------         -------          -------
  Total liabilities..................................     50,883               0           50,883
Shareholders' equity:
  Common stock.......................................         --          23,005           23,005
  Unearned Employee Stock Ownership Plan
     compensation....................................         --          (2,508)(2)       (2,508)
  Retained earnings..................................     22,655                           22,655
  Accumulated other comprehensive income.............
  Unrealized gains in investments net of deferred
     income taxes....................................      3,181                            3,181
                                                         -------         -------          -------
Total shareholders' equity...........................     25,836          20,497(3)        46,333
                                                         -------         -------          -------
Total liabilities and stockholders' equity...........    $76,719         $20,497          $97,216
                                                         =======         =======          =======
</TABLE>
 
  See accompanying Notes to Unaudited Pro Forma Condensed Consolidated Balance
                                     Sheet
                                       35
<PAGE>   36
 
       NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
(1) The pro forma adjustment to reflect the Conversion is as follows (in
    thousands):
 
<TABLE>
<S>                                                             <C>
Issuance of 2,507,500 shares at $10/share...................    $25,075
Estimated conversion expenses...............................     (2,070)
                                                                -------
Net proceeds from Conversion................................    $23,005
                                                                =======
Less: Common Stock to be purchased by ESOP..................     (2,508)
                                                                -------
Net investable proceeds.....................................    $20,497
                                                                =======
</TABLE>
 
(2) Upon completion of the Conversion, the Company will implement an ESOP for
the benefit of participating employees. The ESOP will borrow funds from the
Company in an amount sufficient to purchase 10% of the Common Stock issued in
the Conversion or $2,508. The ESOP Loan will bear interest at a per annum rate
equal to the prime rate as published in The Wall Street Journal on the closing
date of the Conversion, which rate is currently 7.75%. The ESOP Loan will
require monthly principal payments of approximately $21 for a term of ten years.
The amount of this borrowing has been reflected as a reduction from gross
proceeds to determine estimated net investable proceeds. Mercer Mutual intends
to make contributions to the ESOP at least equal to the principal and interest
requirement of the ESOP Loan. As the ESOP Loan is repaid, shareholders' equity
will be increased. Mercer Mutual's payment of amounts due under the ESOP Loan is
based upon equal installments of principal over a 10-year period, assuming a
combined federal and state income tax rate of 34.0%. Interest income earned by
the Company on the ESOP Loan offsets the interest paid by Mercer Mutual on the
ESOP Loan. The ESOP expense reflects adoption of Statement of Position 93-6,
which will require recognition of expense based upon shares committed to be
allocated under the ESOP, and the exclusion of unallocated shares from earnings
per share computations. The valuation of shares committed to be allocated under
the ESOP, would be based upon the average market value of the shares during the
year, which, for purposes of this calculation, was assumed to be equal to the
Purchase Price. See "Management of the Company -- Certain Benefit Plans and
Agreements -- Employee Stock Ownership Plan."
 
(3) Does not reflect the proposed implementation of the MRP, which is subject to
shareholder approval and, therefore, is not "factually supportable," within the
meaning of the Securities and Exchange Commission's rules and regulations. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Effect of Conversion on the Company's Future Financial Condition
and Results of Operations," and "Management of the Company -- Certain Benefit
Plans and Agreements -- Management Recognition Plan."
 
(4) The unaudited pro forma condensed consolidated balance sheet, as prepared,
gives effect to the sale of Common Stock at the Total Minimum of the Estimated
Valuation Range based upon the assumptions set forth under "Use of Proceeds."
The following table provides a comparison between the sale of Common Stock at
the Total Minimum and Total Maximum of the Estimated Valuation Range and at the
Total Maximum of the Estimated Valuation Range plus shares issued to the ESOP in
the amount equal to 10% of the shares issued in the Conversion.
 
<TABLE>
<CAPTION>
                                                                                     TOTAL
                                                                                    MAXIMUM
                                                               TOTAL      TOTAL      PLUS
                                                              MINIMUM    MAXIMUM     ESOP
                                                              -------    -------    -------
<S>                                                           <C>        <C>        <C>
Net proceeds from Conversion................................  $23,005    $31,696    $35,397
Common Stock to be acquired by ESOP.........................  $2,508     $3,393     $ 3,769
</TABLE>
 
                                       36
<PAGE>   37
 
         UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                          YEAR ENDED DECEMBER 31, 1997
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      HISTORICAL       PRO FORMA          PRO FORMA
                                                     CONSOLIDATED    ADJUSTMENTS(1)    CONSOLIDATED(5)
                                                     ------------    --------------    ---------------
<S>                                                  <C>             <C>               <C>
Revenue:
  Net premiums earned..............................    $17,969                           $   17,969
  Investment income, net of expenses...............      2,350                                2,350
  Net realized investment gains....................        589                                  589
  Other revenue....................................        173                                  173
                                                       -------           -----           ----------
          Total revenue............................     21,081               0               21,081
                                                       -------           -----           ----------
Expenses:
  Losses and loss adjustment expenses..............     10,594                               10,594
  Amortization of deferred policy acquisition
     costs.........................................      4,706                                4,706
  Operating expenses...............................      2,563             251(2)             2,814
                                                       -------           -----           ----------
          Total expenses...........................     17,863             251(3)            18,114
                                                       -------           -----           ----------
Income before taxes................................      3,218            (251)               2,967
Income taxes.......................................      1,001             (85)(4)              916
                                                       -------           -----           ----------
Net income.........................................    $ 2,217           $(166)          $    2,051
                                                       =======           =====           ==========
Earnings per share data:
          Net income per share of Common Stock.....                                      $     0.90
          Weighted average number of shares of
            Common Stock outstanding...............                                       2,269,288(6)
</TABLE>
 
 See accompanying Notes to Unaudited Pro Forma Condensed Consolidated Statement
                                   of Income.
                                       37
<PAGE>   38
 
         UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                      NINE MONTHS ENDED SEPTEMBER 30, 1998
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
<TABLE>
<CAPTION>
                                                   HISTORICAL       PRO FORMA             PRO FORMA
                                                  CONSOLIDATED    ADJUSTMENTS(1)       CONSOLIDATED(5)
                                                  ------------    --------------       ---------------
<S>                                               <C>             <C>                  <C>
Revenue:
  Net premiums earned...........................    $17,110                              $   17,110
  Investment income, net of expenses............      1,656                                   1,656
  Net realized investment gains.................        368                                     368
  Other revenue.................................        124                                     124
                                                    -------           -----              ----------
          Total revenue.........................     19,258               0                  19,258
                                                    -------           -----              ----------
Expenses:
  Losses and loss adjustment expenses...........      8,739                                   8,739
  Amortization of deferred policy acquisition
     costs......................................      4,836                                   4,836
  Operating expenses............................      2,755             188(2)(3)             2,943
                                                    -------           -----              ----------
          Total expenses........................     16,330             188                  16,518
                                                    -------           -----              ----------
Income before taxes.............................      2,928            (188)                  2,740
Income taxes....................................        966             (64)(4)                 902
                                                    -------           -----              ----------
Net income......................................    $ 1,962           $(124)             $    1,838
                                                    =======           =====              ==========
Earnings per share data:
  Net income per share of Common Stock..........                                         $     0.80
  Weighted average number of shares of
     Common Stock outstanding...................                                          2,291,228(6)
</TABLE>
 
 See accompanying Notes to Unaudited Pro Forma Condensed Consolidated Statement
                                   of Income.
                                       38
<PAGE>   39
 
                          NOTES TO UNAUDITED PRO FORMA
                   CONDENSED CONSOLIDATED STATEMENT OF INCOME
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
(1) Does not reflect any income from the investment of net investable proceeds
assumed to be received as of January 1, 1997, as such income is not "factually
supportable" as that term is used in the Securities and Exchange Commission's
rules and regulations. On a short-term basis, such proceeds will be invested
primarily in U.S. government securities and other federal agency securities. The
average of the three-month U.S. Treasury bill rate in effect on each of December
31, 1996, March 31, 1997, June 30, 1997 and September 30, 1997 was 5.14% per
annum. If such proceeds were invested at 5.14% for the year ended December 31,
1997 and the nine months ended September 30, 1998, pro forma net income (after
tax), as reported herein, would have increased by $695 and $521 for the year
ended December 31, 1997 and the nine months ended September 30, 1998,
respectively, and pro forma net income per share, as reported herein, would have
increased by $0.31 and $0.23, respectively.
 
(2) Pro forma adjustment to recognize compensation expense under ESOP for shares
of Common Stock committed to be released to participants as the principal
balance of the ESOP Loan is repaid. Interest income earned by the Company on the
ESOP Loan offsets the interest expense paid by Mercer Mutual under the ESOP Loan
at the assumed rate of 7.75% for 10 years. Therefore, no pro forma adjustment is
required with respect to the interest paid on the ESOP Loan.
 
(3) Does not reflect compensation expense associated with the grant of shares
which may be awarded under the MRP, as implementation of the MRP is subject to
shareholder approval and, therefore, is not "factually supportable," within the
meaning of the Securities and Exchange Commission's rules and regulations. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Effect of Conversion on the Company's Financial Condition and
Results of Operations," and "Management of the Company -- Certain Benefit Plans
and Agreements -- Management Recognition Plan."
 
(4) Adjustment to reflect the federal income tax effects of (2) above.
 
(5) The unaudited pro forma condensed consolidated statements of income, as
prepared, give effect to the sale of Common Stock at the Total Minimum of the
Estimated Valuation Range based upon the assumptions set forth under "Use of
Proceeds." The following table provides a comparison between the sale of Common
Stock at the Total Minimum and Total Maximum of the Estimated Valuation Range.
 
<TABLE>
<CAPTION>
                                                 DECEMBER 31, 1997           SEPTEMBER 30, 1998
                                              ------------------------    ------------------------
                                               MINIMUM       MAXIMUM       MINIMUM       MAXIMUM
                                              ----------    ----------    ----------    ----------
<S>                                           <C>           <C>           <C>           <C>
Compensation expense........................  $      251    $      339    $      188    $      254
Net income..................................  $    2,051    $    1,993    $    1,838    $    1,734
Net income per share of Common Stock........  $     0.90    $     0.65    $     0.80    $     0.56
Weighted average number of shares of Common
  Stock outstanding.........................   2,269,288     3,070,213     2,291,228     3,099,897
</TABLE>
 
(6) Calculation of weighted average number of shares outstanding:
 
<TABLE>
<CAPTION>
                                         TOTAL SHARES    LESS: UNALLOCATED      SHARES       WEIGHTED
                                            ISSUED          ESOP SHARES       OUTSTANDING     AVERAGE
                                         ------------    -----------------    -----------    ---------
<S>                                      <C>             <C>                  <C>            <C>
January 1, 1997........................   2,507,500          (250,750)         2,256,750            --
Shares allocated.......................          --            25,075             25,075            --
                                          ---------          --------          ---------     ---------
December 31, 1997......................   2,507,500          (225,675)         2,281,825     2,269,288
Shares allocated.......................          --            18,806             18,806            --
                                          ---------          --------          ---------     ---------
September 30, 1998.....................   2,507,500          (206,869)         2,300,631     2,291,228
                                          =========          ========          =========     =========
</TABLE>
 
     ESOP shares are allocated evenly to plan participants throughout each of
the periods and therefore the weighted average number of shares outstanding is
determined by adding beginning of period and end of period shares outstanding
and dividing by two.
 
                                       39
<PAGE>   40
 
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS
 
GENERAL
 
     The Company has only recently been formed and, accordingly, has no results
of operations. As a result, this discussion relates to the financial condition
and results of operations of Mercer Mutual and its subsidiaries on a
consolidated basis.
 
     The Insurance Companies underwrite property and casualty insurance,
including homeowners, commercial multi-peril, general liability and other lines
of business, in New Jersey and Pennsylvania. The Insurance Companies market
their products through independent agencies. Historically, due to the
concentration of the Insurance Companies' business in New Jersey, the Insurance
Companies' results have been influenced by weather-related property losses in
that state. These results have also been influenced by other factors affecting
the property and casualty insurance industry in general, such as competition,
catastrophic events, regulation, general economic conditions and changes in the
investment environment.
 
     This analysis of Mercer Mutual's consolidated financial condition and
results of operations, as well as the selected financial data set forth in the
table below, should be read in conjunction with Mercer Mutual's Consolidated
Financial Statements and the other financial data regarding Mercer Mutual found
elsewhere in this Prospectus. The discussion covers Mercer Mutual's consolidated
financial condition and results of operations for the nine months ended
September 30, 1997 and 1998 and the three years ended December 31, 1997. Mercer
Mutual's fiscal year ends on December 31, and reference herein to a particular
year means, unless otherwise stated, the fiscal year ended on December 31 of
that year. For an explanation of certain terms used in this discussion and
analysis that are commonly used in the insurance industry, see the "Glossary to
Selected Insurance Terms."
 
                                       40
<PAGE>   41
 
                          MERCER INSURANCE GROUP, INC.
                         MD & A SELECTED FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                    NINE MONTHS ENDED
                                      SEPTEMBER 30,
                                       (UNAUDITED)                          YEAR ENDED DECEMBER 31,
                              -----------------------------   ----------------------------------------------------
                                          %                               %                      %
                               1998     CHANGE       1997      1997     CHANGE       1996     CHANGE        1995
                              -------   ------      -------   -------   ------      -------   -------      -------
                                                                 (IN THOUSANDS)
<S>                           <C>       <C>         <C>       <C>       <C>         <C>       <C>          <C>
Revenue Data:
  Direct premiums written...  $22,977     6.8%      $21,504   $28,453    14.0%      $24,958       1.0%     $24,699
  Assumed premiums
     written................      500    17.4%          426       547   (89.1)%       5,013     (51.3)%     10,287
  Ceded premiums written....    2,743   (69.6)%       9,026    11,539    17.2%        9,847     (28.3)%     13,741
                              -------               -------   -------               -------                -------
  Net premiums written......   20,734    60.7%       12,904    17,461   (13.2)%      20,124      (5.3)%     21,245
  Change in unearned
     premiums...............   (3,624)                  384       508                   510                   (428)
                              -------               -------   -------               -------                -------
  Net premiums earned.......   17,110    28.8%       13,288    17,969   (12.9)%      20,634      (0.9)%     20,817
  Net investment income.....    1,656    (7.6)%       1,793     2,350     2.7%        2,289       7.4%       2,132
  Net realized investment
     gains..................      368   (23.8)%         483       589    (1.2)%         596   1,024.5%          53
  Other income..............      124   (13.9)%         144       173    11.6%          155      (3.7)%        161
                              -------               -------   -------               -------                -------
          Total revenue.....   19,258    22.6%       15,708    21,081   (11.0)%      23,674       2.2%      23,163
                              -------               -------   -------               -------                -------
Losses and expenses:
  Loss and loss adjustment
     expenses...............    8,739     8.7%        8,038    10,594   (28.4)%      14,801      11.3%      13,296
  Other underwriting
     expenses...............    7,591    39.0%        5,461     7,269    (9.8)%       8,062      (3.6)%      8,360
                              -------               -------   -------               -------                -------
          Total expenses....   16,330    21.0%       13,499    17,863   (21.9)%      22,863       5.6%      21,656
                              -------               -------   -------               -------                -------
Income before federal income
  taxes.....................    2,928    32.5%        2,209     3,218   296.8%          811     (46.2)%      1,507
Federal income tax
  expenses..................      966    39.2%          694     1,001   485.4%          171     (53.7)%        369
                              -------               -------   -------               -------                -------
Net income..................  $ 1,962    29.5%      $ 1,515   $ 2,217   246.4%      $   640     (43.8)%    $ 1,138
                              =======               =======   =======               =======                =======
Loss and loss adjustment
  expense ratio.............     51.1%                 60.5%     58.9%                 71.7%                  63.9%
Expense ratio...............     44.4%                 41.1%     40.5%                 39.1%                  40.2%
Combined ratio..............     95.5%                101.6%     99.4%                110.8%                 104.1%
</TABLE>
 
RESULTS OF OPERATIONS FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 COMPARED TO
THE NINE MONTHS ENDED SEPTEMBER 30, 1997
 
     Premiums -- Direct premiums written for the nine months ended September 30,
1998 increased by $1.5 million or 6.8%, as compared to the same period in 1997,
reflecting Mercer Mutual's strategic decision to increase its commercial
business. Commercial lines premiums increased by $1.5 million, or 17.0%, for the
nine months ended September 30, 1998 over the comparable prior period. The
increase in commercial lines writings reflects the continued success of recently
introduced commercial programs such as the religious institution program and the
commercial automobile program. Commercial lines now represent nearly 50% of the
total direct writings of Mercer Mutual. The effect on direct premiums written
caused by the increase in direct commercial writings was slightly offset by a
decrease in personal lines writings of $67,000.
 
     Assumed premiums written increased by $74,000 or 17.4%, reflecting Mercer
Mutual's share of increasing residual market facilities. Certain residual
markets in which Mercer Mutual must participate, as directed by statute, have
grown in recent years thereby increasing Mercer Mutual's dollar participation.
 
                                       41
<PAGE>   42
 
     Ceded premiums written decreased $6.3 million, or 69.6%, for the nine
months ended September 30, 1998 compared to the nine months ended September 30,
1997, reflecting changes in Mercer Mutual's reinsurance programs during both
periods. Effective January 1, 1998, Mercer Mutual converted its reinsurance
program to one that is predominantly an excess of loss program, and also
increased its retention levels. As a result, there have been significant
reductions in premiums ceded to outside reinsurers. Ceded premiums for the nine
months ended September 30, 1997 included approximately $1.3 million of
additional ceded premiums attributable to the introduction of a new quota share
reinsurance program for the homeowners business (the "Homeowners Quota Share
Program") at January 1, 1997. See "Business -- Reinsurance" for a description of
Mercer Mutual's reinsurance programs. Also see "Risk Factors -- Availability and
Adequacy of Reinsurance."
 
     Net premiums written increased $7.8 million or 60.7%, to $20.7 million for
the nine months ended September 30, 1998 from the nine months ended September
30, 1997. For the same comparative period, net premiums earned increased by $3.8
million, or 28.8%, to $17.1 million. The increases in net premiums written and
net premiums earned for the nine months ended September 30, 1998 are
attributable to the increase in direct commercial writings and the restructuring
of the reinsurance program discussed above.
 
     Net Investment Income -- Net investment income decreased $137,000, or 7.6%,
to $1.7 million for the nine months ended September 30, 1998, as compared to the
same period in 1997. This decrease was partly due to a slight decrease in the
yield on fixed income securities, which was 6.34% for the nine months ended
September 30, 1998 compared to 6.69% for the same period in 1997. In addition,
investment income from equity securities decreased by $22,000 for the nine
months ended September 30, 1998 compared to the same period in 1997.
 
     Net Realized Investment Gains -- Net realized investment gains decreased by
$115,000 for the nine months ended September 30, 1998 compared to the nine
months ended September 30, 1997.
 
     Underwriting Results -- For the nine months ended September 30, 1998,
Mercer Mutual had an underwriting gain of $780,000 and a combined ratio of
95.5%, compared to an underwriting loss of $211,000 and a combined ratio of
101.6% for the nine months ended September 30, 1997. The improvement in
underwriting results reflects the low claim volume for 1998, due in part to the
lack of severe weather conditions during 1998, and the restructuring of its
reinsurance program.
 
     Losses and Loss Adjustment Expenses -- Net losses and loss adjustment
expenses incurred increased by $701,000, or 8.7%, to $8.7 million for the nine
months ended September 30, 1998 from the same period in 1997. Despite such
increase, loss and loss adjustment expenses were 51.1% of net premiums earned
for the nine months ended September 30, 1998 compared to 60.5% for the nine
months ended September 30, 1997. The favorable ratio for 1998 is largely
attributable to the lack of severe weather conditions during 1998. Winter
conditions were extremely mild, and the number of losses reported to Mercer
Mutual during the nine months ended September 30, 1998 was the lowest number
reported during such period in the past five years.
 
     Underwriting Expenses -- Underwriting expenses increased by $2.1 million,
or 39.0%, to $7.6 million for the nine months ended September 30, 1998 from the
same period in 1997. This increase was primarily attributable to an increase in
net commissions, which resulted from changes in Mercer Mutual's reinsurance
program. The termination of most of the proportional reinsurance arrangements
significantly reduces the amount of ceded commissions received. The reduction in
ceded commissions results in the increase in net commissions. In addition,
$365,000 in non-recurring legal fees were incurred during the nine months ended
September 30, 1998.
 
     Federal Income Tax Expense -- Federal income tax expense was $966,000 for
the nine months ended September 30, 1998 compared to $694,000 for the same
period in 1997, which is attributable to the increase in net income before
taxes.
 
     Net Income -- Mercer Mutual had net income of $2.0 million for the nine
months ended September 30, 1998, compared to $1.5 million for the same period in
1997, primarily as a result of the factors discussed above.
 
                                       42
<PAGE>   43
 
RESULTS OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 1997 COMPARED TO THE YEAR
ENDED DECEMBER 31, 1996
 
     Premiums -- Mercer Mutual experienced an increase in direct premiums
written for the year ended December 31, 1997 of $3.5 million or 14.0%, as
compared to the same period in 1996, which reflects Mercer Mutual's strategy to
increase its commercial business. Commercial lines premiums increased by $2.6
million, or 28.2%, for the year ended December 31, 1997 over the comparable
prior period. The increase in commercial lines business reflects the
introduction of a religious institution program and a commercial automobile
program in early 1997, combined with enhancements to existing commercial
products. In addition to the commercial lines increase, homeowners premiums
increased in the year ended December 31, 1997, as compared to the prior period,
as a result of an increase in certain rates. Territorial rating by county was
introduced for Mercer Mutual's New Jersey homeowners product to better reflect
Mercer Mutual's exposures. This rate change resulted in an increase of 7.9% in
direct homeowners premiums written despite a decrease of 4.3% in the number of
homeowners policies written.
 
     Assumed premiums written decreased by $4.5 million, or 89.1%, for the year
ended December 31, 1997 as compared to the same period in 1996. Approximately
$4.3 million of this decrease is directly attributable to the termination of
Mercer Mutual's participation in the New Jersey Homeowners Pool (the "Homeowners
Pool") as of December 31, 1996 because premiums are no longer assumed under the
terms of that agreement.
 
     Ceded premiums written increased $1.7 million, or 17.2%, for the year ended
December 31, 1997 compared to the year ended December 31, 1996, principally
because of the above-described increase in direct premiums written of 14.0%. As
premiums subject to reinsurance coverage increase, ceded written premiums
increase at similar levels. The increase in ceded premiums also reflects the
introduction of reinsurance for Mercer Mutual's new commercial automobile
program and small increases in certain premium rates.
 
     Net premiums written decreased $2.7 million or 13.2%, to $17.4 million for
the year ended December 31, 1997 from the year ended December 31, 1996. For the
same comparative period, net premiums earned decreased by $2.7 million, or
12.9%, to $18.0 million. The decrease in net premiums written and net premiums
earned for the year ended December 31, 1997 is principally attributable to the
termination of the Homeowners Pool.
 
     Net Investment Income -- Net investment income increased $61,000, or 2.7%,
to $2.4 million for the year ended December 31, 1997 as compared to the same
period in 1996. Mercer Mutual continues to principally invest its available
funds in taxable fixed income securities which generally produce higher yields
than nontaxable securities. For the year ended December 31, 1997, the yield on
fixed income securities remained at the 6.7% level attained in 1996.
 
     Net Realized Investment Gains -- Net realized investment gains decreased by
$7,000 for the year ended December 31, 1997 compared to the year ended December
31, 1996. Despite this small decrease, realized investment gains in 1997 reflect
continued favorable equity market conditions.
 
     Underwriting Results -- For the year ended December 31, 1997, Mercer Mutual
had an underwriting gain of $106,000 and a combined ratio of 99.4% compared to
an underwriting loss of $2.2 million and a combined ratio of 110.8% for the year
ended December 31, 1996. The change in underwriting results is largely
attributable to the improved winter weather conditions in 1997. In addition, the
improvement in underwriting results reflects Mercer Mutual's strategy to
increase its casualty business, which is less sensitive to weather conditions.
 
     Losses and Loss Adjustment Expenses -- Net losses and loss adjustment
expenses incurred decreased by $4.2 million, or 28.4%, to $10.6 million for the
year ended December 31, 1997 from the same period in 1996. Loss and loss
adjustment expenses were 58.9% of net premiums earned for the year ended
December 31, 1997 compared to 71.7% for the year ended December 31, 1996. The
favorable improvement in this ratio is largely attributable to the lack of
severe weather conditions in the 1997 period. The 1997 winter conditions were
among the mildest in recent history, as compared to the severe winter conditions
of 1996 which resulted in increased property loss claims. In January 1996, a
damaging blizzard struck Mercer Mutual's operating region. The net cost of the
blizzard was approximately $1 million in additional claims. In addition, as of
January 1,
 
                                       43
<PAGE>   44
 
1997, the Homeowners Pool was replaced with the Homeowners Quota Share Program.
The termination of the Homeowners Pool and the placement of the Homeowners Quota
Share Program served to reduce net loss and loss adjustment expenses in 1997 by
$2.3 million over 1996. In 1996, participation in the Homeowners Pool increased
losses and loss adjustment expenses by $1.4 million. In 1997, however, because
participation in the Homeowners Quota Share Program does not require the
assumption of premiums or losses (unlike the Homeowners Pool) but does require
the ceding of premiums and losses, such participation decreased loss and loss
adjustment expenses by $865,000. See "Business -- Reinsurance" for a description
of the Homeowners Pool, the Homeowners Quota Share Program and Mercer Mutual's
other reinsurance programs.
 
     Underwriting Expenses -- Underwriting expenses decreased by $793,000, or
9.8%, to $7.3 million for the year ended December 31, 1997 from the same period
in 1996. This decrease was partially attributable to a reduction in net
commissions, which resulted from changes in Mercer Mutual's reinsurance program.
The new Homeowners Quota Share Program pays a higher ceding commission to Mercer
Mutual than was available as a participant in the Homeowners Pool. In addition,
the termination of the Homeowners Pool resulted in a substantial reduction in
assumed commissions. Also, favorable weather conditions during the year ended
December 31, 1997 resulted in additional ceded commissions recognized under
profit commission arrangements.
 
     Federal Income Tax Expense -- Federal income tax expense was $1.0 million
for the year ended December 31, 1997 compared to $171,000 for the same period in
1996, which is attributable to the increase in net income before taxes.
 
     Net Income -- Mercer Mutual had net income of $2.2 million for the year
ended December 31, 1997, compared to $640,000 for the same period in 1996,
primarily as a result of the factors discussed above.
 
RESULTS OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 1996 COMPARED TO YEAR
ENDED DECEMBER 31, 1995
 
     Premiums -- Mercer Mutual experienced a 1.0% increase in direct premiums
written in the year ended December 31, 1996 to $25.0 million, as compared to
$24.7 million for the year ended December 31, 1995. Premiums written under
commercial line classifications increased during 1996 as Mercer Mutual
substantially increased its underwriting in this direction. The increase in
commercial lines business was somewhat offset by a reduction in business caused
by the termination of unprofitable agencies.
 
     Assumed premiums written decreased by $5.3 million in 1996, reflecting the
termination of Mercer Mutual's participation in the Homeowners Pool. See
"Business -- Reinsurance." As a result of this termination, unearned premium
reserves assumed from the other pool participants were returned on December 31,
1996, which resulted in the reduction of assumed written premiums for the year.
 
     Ceded premiums written decreased $3.9 million for the year ended December
31, 1996 compared to the year ended December 31, 1995. As a result of the
termination of the Homeowners Pool, unearned premium reserves ceded to the other
pool participants were returned to Mercer Mutual. The return of ceded unearned
premium reserves was offset by an increase in catastrophe reinsurance premiums,
as Mercer Mutual restructured its catastrophe reinsurance coverage.
 
     Net premiums written decreased $1.1 million, or 5.3%, to $20.1 million for
the year ended December 31, 1996 from the year ended December 31, in 1995. For
the same comparative periods, net premiums earned decreased by $183,000, or
0.9%, to $20.6 million. The decrease in net premiums earned was the result of
the previously discussed increase in direct premiums written, decrease in
premiums assumed from reinsurers, decrease in premiums ceded to reinsurers and a
decrease in unearned premiums of $510,000.
 
     Net Investment Income -- Net investment income increased $158,000, or 7.4%,
to $2.3 million for the year ended December 31, 1996 from the year ended
December 31, 1995. Reflecting Mercer Mutual's continued strategy to principally
invest in high grade fixed income securities, fixed income securities increased
$1.3 million, or 4.0%, to $35.0 million for the year ended December 31, 1996
from the year ended December 31, 1995. For the year ended December 31, 1996, the
yield on fixed income securities remained at the 6.8% level attained for the
year ended December 31, 1995. As a result, income from fixed income securities
increased by $258,000.
 
                                       44
<PAGE>   45
 
     Due to increased claim activity from the 1996 winter conditions, cash and
cash equivalents decreased $892,000 to $2.7 million for the year ended December
31, 1996 from the year ended December 31, 1995. This resulted in a decrease in
1996 of investment income from cash and cash equivalents of $50,000. Income from
other investments was down slightly in 1996, from $54,000 in 1995 to $46,000 in
1996, as funds have principally been reinvested in fixed income securities.
 
     Net Realized Investment Gains -- Net realized investment gains were
$596,000 for the year ended December 31, 1996 compared to $53,000 for the year
ended December 31, 1995. Investment gains in 1996 reflect more favorable equity
market conditions, and compare with smaller gains recognized in 1995.
Investments gains in 1995 from equity securities were offset by investment
losses recognized on the disposal of certain collateralized mortgage obligations
("CMOs"). This reflected Mercer Mutual's restructuring of its fixed income
portfolio in 1995 to less interest rate sensitive products.
 
     Underwriting Results -- For the year ended December 31, 1996, Mercer Mutual
had an underwriting loss of $2.2 million and a combined ratio of 110.8% compared
to an underwriting loss of $839,000 and a combined ratio of 104.1% for the year
ended December 31, 1995. The increased underwriting loss for the year ended
December 31, 1996 was primarily attributable to severe winter weather conditions
in New Jersey.
 
     Losses and Loss Adjustment Expenses -- Net losses and loss adjustment
expenses incurred increased by $1.5 million, or 11.3%, to $14.8 million for the
year ended December 31, 1996 from the year ended December 31, 1995. Loss and
loss adjustment expenses were 71.7% of net premiums earned for the year ended
December 31, 1996 compared to 63.9% for the year ended December 31, 1995.
 
     Affecting losses and loss adjustment expenses in 1996 were severe winter
weather conditions which resulted in increased property loss claims. In January
1996, a damaging blizzard struck Mercer Mutual's operating region. The net cost
of the blizzard was approximately $1 million in additional claims. Mercer Mutual
was further impacted by additional smaller localized severe conditions. The
difference in non-storm activity between 1996 and 1995 was further influenced by
favorable weather conditions in 1995.
 
     Underwriting Expenses -- Underwriting expenses decreased by $298,000, or
3.6%, for the year ended December 31, 1996 to $8.1 million for the year ended
December 31, 1995. This decrease was largely attributable to a reduction in net
commissions resulting from the restructuring of Mercer Mutual's reinsurance
programs. For the year ended December 31, 1996, Mercer Mutual had an
underwriting expense ratio of 39.1% compared to 40.2% for the year ended
December 31, 1995.
 
     Federal Income Tax Expense -- Federal income tax expense was $171,000 for
the year ended December 31, 1996 compared to $369,000 for the year ended
December 31, 1995. This decrease is attributable to the decrease in net income
before taxes for the compared periods.
 
     Net Income -- Mercer Mutual had net income of $640,000 for the year ended
December 31, 1996 compared to $1.1 million for the year ended December 31, 1995,
primarily as a result of the factors discussed above.
 
EFFECT OF CONVERSION AND REDOMESTICATION ON THE COMPANY'S FUTURE FINANCIAL
CONDITION AND RESULTS OF OPERATIONS
 
     The future financial condition and results of operations of the Company
will be affected by the Conversion and related transactions. Upon completion of
the Conversion, the Company's capital will increase by between $20.5 million and
$31.6 million, an increase of approximately 79.3% to 122.4% over the
consolidated capital of Mercer Mutual at September 30, 1998. See "Use of
Proceeds," "Capitalization" and "Pro Forma Data." This increased capitalization
should permit the Company to (i) increase direct premium volume to the extent
competitive conditions permit, (ii) increase net premium volume by decreasing
its reliance on reinsurance (see "Business -- Strategy -- Reduced Reliance on
Reinsurance"), and (iii) enhance investment income by increasing its investable
capital.
 
     ESOP.  In connection with the Conversion, the ESOP intends to finance the
purchase of 10% of the Common Stock issued in the Conversion with the proceeds
from the ESOP Loan, and Mercer Mutual will
 
                                       45
<PAGE>   46
 
make annual contributions to the ESOP sufficient to repay the ESOP Loan, which
the Company estimates will total, on a pre-tax basis, between $250,750 (at the
Total Minimum) and $376,944 (at the Total Maximum) annually, plus interest at
the prime rate in effect as of the consummation of the Conversion. See
"Management of the Company -- Certain Benefit Plans and Agreements -- Employee
Stock Ownership Plan."
 
     MRP.  The Company may contribute to the MRP the amount necessary to
purchase up to an aggregate number of shares equal to 4% of the shares of Common
Stock that were issued in the Conversion (up to 135,700 shares at the Total
Maximum of the Estimated Valuation Range). The cost of any Common Stock
purchased by the MRP will represent unearned compensation. As the Company
accrues compensation expense to reflect the vesting of such shares, unearned
compensation will be reduced accordingly. This compensation expense will be
deductible for federal income tax purposes. Implementation of the MRP is subject
to shareholder approval. See "Management of the Company -- Certain Benefit Plans
and Agreements -- Management Recognition Plan."
 
     State Taxes.  Prior to the Redomestication, which occurred on October 16,
1997, Mercer Mutual was subject to tax in New Jersey as a New Jersey-domiciled
insurance company. New Jersey has a statutory retaliatory tax provision that,
because Mercer Mutual is now a Pennsylvania-domiciled insurance company, could
be interpreted to require Mercer Mutual to pay, for all or a portion of 1997 and
for all future years, substantially more in taxes to New Jersey than it has in
the past, which would have a material adverse affect on the results of
operations of Mercer Mutual. Under this interpretation, if the Redomestication
had occurred on January 1, 1997, Mercer Mutual would have been required to pay
$542,000 in taxes to New Jersey for the year ended December 31, 1997, $469,000
more than the amount which Mercer Mutual has calculated as due for such year.
Management does not believe that this interpretation is correct. If it is,
however, the New Jersey retaliatory tax provision would materially affect the
Company's future results of operations and cash flows, but would not be expected
to materially affect the Company's liquidity because the investment and
reinsurance strategies in place provide liquidity to Mercer Mutual. See "Risk
Factors -- Possible Adverse Impact of New Jersey Tax Laws." Mercer Mutual,
however, may have the ability to mitigate a portion of any adverse tax
consequences by renewing policies in MIC, a New Jersey domestic insurance
company.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     Liquidity is a measure of the ability to generate sufficient cash to meet
cash obligations as they come due. Historically, the principal sources of Mercer
Mutual's cash flow have been premiums, investment income, and maturing
investments. In addition to the need for cash flow to meet operating expenses,
the liquidity requirements of Mercer Mutual relate primarily to the payment of
losses and loss adjustment expenses. The short- and long-term liquidity
requirements of Mercer Mutual vary because of the uncertainties regarding the
settlement dates for liabilities for unpaid claims and because of the potential
for large losses, either individually or in the aggregate.
 
     Mercer Mutual maintains investment and reinsurance programs which are
intended to provide sufficient funds to meet Mercer Mutual s obligations without
forced sales of investments. Mercer Mutual maintains a portion of its investment
portfolio in relatively short-term and highly liquid assets to ensure the
availability of funds. Mercer Mutual had no material commitments for capital
expenditures at September 30, 1998.
 
     The NAIC's risk based capital standards require insurance companies to
calculate and report statutory capital and surplus needs based on a formula
measuring underwriting, investment and other business risks inherent in an
individual company's operations. At December 31, 1997, the capital and surplus
of each of the Insurance Companies were substantially above these requirements.
See "Risk Factors -- Possible Adverse Impact of Regulatory Changes."
 
     The principal source of liquidity for the Company will be dividend payments
and other fees received from Mercer Mutual. The Pennsylvania Department's
approval of the Conversion is subject to, among other things, the condition
that, for a period of three years following the Conversion, Mercer Mutual may
not declare or pay any dividend to the Company without the approval of the
Pennsylvania Department. After such three-year period, Mercer Mutual will be
restricted by the insurance laws of Pennsylvania as to the amount of dividends
 
                                       46
<PAGE>   47
 
or other distributions it may pay to the Company without the prior approval of
the Pennsylvania Department. Under Pennsylvania law, the maximum amount that may
be paid by Mercer Mutual during any twelve-month period after notice to, but
without prior approval of, the Pennsylvania Department cannot exceed the greater
of 10% of Mercer Mutual's statutory surplus as reported on its most recent
annual statement filed with the Pennsylvania Department, or the net income of
Mercer Mutual for the period covered by such annual statement. If the dividend
restrictions contained in the Orders were not in effect, then as of December 31,
1997 the amounts available for payment of dividends from Mercer Mutual in 1998
without the prior approval of the Pennsylvania Department would have been
approximately $2.0 million. MIC is required to provide notice to the New Jersey
Department prior to its payment of any dividends. The New Jersey Department has
the power to limit or prohibit dividend payments if certain conditions exist.
Such restrictions or any subsequently imposed restrictions may in the future
affect the Company's liquidity.
 
CHANGES IN REINSURANCE
 
     Mercer Mutual terminated its participation in the Garden State Reinsurance
Association ("GSRA") as of December 31, 1997. The termination of this
arrangement is not expected to have a material impact on the Company's results
of operations and cash flows because the cost to reinsure this business should
approximate the net cost incurred in participating in the GSRA.
 
     Effective January 1, 1998, the Insurance Companies restructured their
reinsurance program by increasing the exposure retained by the Insurance
Companies on certain coverages. The level of such restructuring with respect to
each coverage was based largely on historical loss experience, with overall
consideration given to a recent reduction in the amount of the Insurance
Companies' Probable Maximum Loss. By increasing retention levels, the amount of
premiums ceded to reinsurers will decrease, thus increasing net premiums. Losses
and loss adjustment expenses will increase because fewer losses and loss
adjustment expenses will be recovered from reinsurers. Net reserve estimates
should increase as recoveries from reinsurers decrease. Management believes that
by restructuring the Insurance Companies' retention levels, there should be a
positive impact on its results of operations and financial condition, as
increased premium earnings should exceed any increase in losses and loss
adjustment expenses caused by this restructuring. No assurance can be made,
however, that any future losses resulting from this restructuring would not
exceed the aggregate increase in net premiums resulting from the restructuring,
or would not otherwise have a material adverse effect on the Insurance
Companies' financial condition and results of operations. See "Business --
Reinsurance."
 
CHANGES IN INTEREST RATES
 
     Much of the Company's fixed income investment portfolio matures after five
years. It is the Company's strategy to hold these securities until maturity.
Even so, fluctuations in near-term interest rates could have an impact on the
Company's results of operations and cash flows. Certain of these securities have
call features. In a declining interest rate environment, these securities may be
called by their issuer and replaced with securities bearing lower interest
rates. In a rising interest rate environment, because of its strategy of holding
these securities to maturity, the Company's ability to invest in higher yielding
securities would be limited.
 
EFFECTS OF INFLATION
 
     The effects of inflation on Mercer Mutual are implicitly considered in
estimating reserves for unpaid losses and loss adjustment expenses, and in the
premium rate-making process. The actual effects of inflation on Mercer Mutual's
results of operations cannot be accurately known until the ultimate settlement
of claims. However, based upon the actual results reported to date, it is
management's opinion that Mercer Mutual's loss reserves, including reserves for
losses that have been incurred but not yet reported, make adequate provision for
the effects of inflation.
 
                                       47
<PAGE>   48
 
NEW ACCOUNTING STANDARDS
 
     Stock-Based Compensation (Financial Accounting Standards Board ("FASB")
Statement No. 123) -- The Company does not presently have any stock-based
compensation plans. It plans to account for any shares issued under the proposed
stock-based compensation plans under APB Opinion 25 and will disclose the
difference, if any, on net earnings and earnings per share if compensation cost
were determined under FASB Statement No. 123.
 
     Earnings Per Share (FASB Statement No. 128) -- This statement defines the
computation, presentation and disclosure requirements for earnings per share
calculations. The Company plans to adopt the provisions of this statement with
respect to the Company's reports to shareholders.
 
     Comprehensive Income (FASB Statement No. 130) -- The Company adopted FASB
Statement No. 130 in 1997 and comprehensive income is displayed in its
statements of changes in surplus for all periods presented. Material provisions
of this statement include reclassification adjustments of other comprehensive
income components, the prominent display of other comprehensive income
components and the disclosure on the amount of income tax expense or benefit
allocated to each component. All such provisions have been applied for all
periods presented.
 
     Segment Disclosures (FASB Statement No. 131) -- This statement establishes
standards for the way that public companies report operating segments and
standards for related disclosure about products and services, geographic areas
and major customers. The Company plans to adopt the provisions of this statement
commencing with the year ended December 31, 1998.
 
IMPACT OF YEAR 2000 ISSUE
 
     The Insurance Companies have taken measures to address the impact of the
"Year 2000" issue on their information systems. The Year 2000 issue, which is
common to most businesses, concerns the inability of certain information
systems, primarily certain computer software programs, to properly recognize and
process date sensitive information beyond the year 1999. This inability could
result in system failures or miscalculations causing possible inaccuracies in
data and disruption of operations, including among other things, a temporary
inability to process transactions, prepare invoices, or engage in similar normal
business activities.
 
     The Company completed its initial assessment of the impact of this issue on
the Company, and has determined that its vulnerability is mainly (i) with the
third party provider who processes all of the Insurance Companies' premium, loss
and billing transactions, (ii) with certain other third parties with whom the
Insurance Companies deal in the ordinary course of their business, such as
agents, governmental agencies and providers of investment and banking services,
and (iii) under policies of insurance providing business interruption and other
coverages to insureds who are adversely impacted by the Year 2000.
 
     Under the Insurance Companies' agreement with the third party provider, the
provider is obligated to pay all software related costs incurred in order to
make its system Year 2000 compliant. In its compliance project, the provider
made certain modifications to its system in an effort to make it Year 2000
compliant, and prepared a detailed schedule of functions to be performed in
order to test the system's compliance. Testing of such modifications has not
resulted in any problems with the system. However, such testing is ongoing and
will be completed no later than March 1999. The Insurance Companies are
obligated to incur only the hardware cost associated with implementing the
changes required by the service provider. These hardware costs to date are less
than $10,000 and are not expected to exceed $50,000 at the completion of the
compliance project. Other computer programs utilized by the Insurance Companies,
such as accounting packages and investment packages, either are believed to be
Year 2000 compliant or are expected to be Year 2000 compliant in the near future
at no significant cost to the Insurance Companies. The Insurance Companies do
not have any significant noninformational technology requiring Year 2000
remediation.
 
     The Insurance Companies have risk that certain third parties with whom they
deal in the ordinary course of their business will suffer Year 2000 problems.
Systems used by the Insurance Companies' independent insurance agencies may not
yet be Year 2000 compliant. Some information used in underwriting policies and
adjusting claims, such as motor vehicle reports and crime data bases, is
generally obtained electronically. Certain investment portfolio pricing
information and banking information is also obtained electronically. The
 
                                       48
<PAGE>   49
 
Insurance Companies are communicating with and monitoring the Year 2000
compliance progress of such third parties and will decide on contingency plans,
if any, by mid-1999.
 
     With respect to insurance policies providing coverages to insureds who may
incur losses as a result of Year 2000 problems, the Insurance Companies are in
the process of reviewing these coverages to evaluate the Insurance Companies'
possible exposure under such coverages. Endorsements excluding losses relating
to or resulting from Year 2000 issues are being attached to all commercial
policies issued or renewed on or after January 1, 1999. To the extent that the
Insurance Companies' systems and those of their policyholders are not fully Year
2000 compliant, the Insurance Companies do not have any contingency plan.
Therefore, in a worst case scenario, systems interruptions, the cost necessary
to update software, and resulting losses and loss adjustment expenses under
policies issued by the Insurance Companies would have a materially adverse
effect on the Insurance Companies' business, financial condition and results of
operations.
 
                                       49
<PAGE>   50
 
                                    BUSINESS
 
THE COMPANY
 
     The Company was incorporated under Pennsylvania law in November 1997 for
the purpose of serving as a holding company for Mercer Mutual upon the
acquisition of all of its capital stock in the Conversion. The Company has
received the approval of the Pennsylvania Department to acquire control of
Mercer Mutual. Prior to the Conversion, the Company has not engaged and will not
engage in any significant operations. Upon completion of the Conversion, the
Company's primary assets will be the outstanding capital stock of Mercer Mutual
and a portion of the net proceeds of the Conversion.
 
     Management believes that the holding company structure will permit the
Company to expand the products and services it offers to beyond those currently
offered through the Insurance Companies, although presently there are no
definitive plans or arrangements for such expansion. As a holding company, the
Company will have greater flexibility to diversify its business activities
through existing or newly formed subsidiaries or through the issuance of capital
stock to facilitate acquisitions or mergers or to obtain additional financing in
the future. The portion of the net proceeds from the sale of Common Stock in the
Conversion that the Company will contribute to Mercer Mutual will substantially
increase Mercer Mutual's surplus, which will, in turn, enhance policyholder
protection and increase the amount of funds available to support both current
operations and future growth. After the Conversion, the Company will be subject
to regulation by the Pennsylvania Department and the New Jersey Department as
the holding company for Mercer Mutual and MIC, respectively.
 
THE INSURANCE COMPANIES
 
     Mercer Mutual is a Pennsylvania mutual insurance company that was
originally incorporated under a special act of the Legislature of the State of
New Jersey in 1844. Mercer Mutual commenced operations under the name Mercer
County Mutual Fire Insurance Company, which was changed to its current name in
1958. On October 16, 1997, Mercer Mutual filed Articles of Domestication with
Pennsylvania completing the Redomestication and thereby changing its state of
domicile from New Jersey to Pennsylvania. Mercer Mutual owns all of the issued
and outstanding capital stock of QHC, which owns all of the issued and
outstanding capital stock of MIC.
 
     Mercer Mutual is a property and casualty insurer of small and medium-sized
businesses and property owners located in New Jersey and Pennsylvania. Mercer
Mutual markets homeowners and commercial multi-peril policies, as well as other
liability, workers' compensation, fire, allied, inland marine and commercial
automobile coverages through approximately 140 independent agencies. Mercer
Mutual is subject to examination and comprehensive regulation by the
Pennsylvania Department. See "Business -- Regulation."
 
     MIC is a property and casualty stock insurance company that was
incorporated in 1981. Currently, MIC offers only workers' compensation insurance
to businesses located in New Jersey. However, MIC is in the process of applying
to the New Jersey Department for permission to expand its business to include
those types of insurance offered by Mercer Mutual, and expects to receive such
approval in the first half of 1999. MIC is subject to examination and
comprehensive regulation by the New Jersey Department. See "Business --
Regulation."
 
     Direct premiums written in New Jersey accounted for in excess of 98.5% of
the direct premiums written by the Insurance Companies for the nine months ended
September 30, 1998 and each of the years in the three-year period ended December
31, 1997. As of September 30, 1998, the Insurance Companies had approximately
42,000 property and casualty policies in force. Mercer Mutual is licensed to
underwrite property and casualty insurance in New Jersey and Pennsylvania. MIC
is licensed only in New Jersey. At September 30, 1998, the consolidated assets
of Mercer Mutual and its subsidiaries were $76.7 million.
 
                                       50
<PAGE>   51
 
STRATEGY
 
     The Company's principal strategies for the future are to:
 
     - Improve the mix of business by increasing commercial and casualty
       writings in order to enhance profitability and lessen the impact of
       property losses on overall results;
 
     - Geographically diversify its risk through its acquisition of other
       insurance companies in Pennsylvania and other jurisdictions, in order to
       reduce its overall exposure to weather-related property losses in its
       primary coverage area;
 
     - Attract and retain high-quality agencies having diverse customer bases
       located in the Company's targeted growth markets within Pennsylvania and
       western New Jersey, through increased marketing activities and the
       development and tailoring of commercial programs meeting the needs of
       their customers; and
 
     - Reduce its reliance on reinsurance by increasing the maximum exposure
       retained by the Insurance Companies on individual property and casualty
       risks, and thereby increase net premium volume.
 
     Management views the Conversion as a critical component of its strategic
plan. The additional capital generated by the Conversion will permit the
Insurance Companies to accelerate implementation of these strategies and the
resulting holding company structure will provide needed flexibility to achieve
the Company's goals.
 
     Diversification of Lines of Business.  Mercer Mutual has taken, and will
continue to take, steps to increase commercial and casualty premium volume, both
to provide greater product diversification from personal into commercial lines
that may provide greater flexibility in establishing rates, higher premiums and
a countercyclical balance to personal lines and to potentially reduce property
loss exposure.
 
     One such initiative is a religious institution program available for
churches and synagogues which includes many preferred coverages and special
pricing. Management believes that this market is underserved and Mercer Mutual's
program has been able to attract agencies which have substantial books of
business with religious institutions. Mercer Mutual has developed new policy
forms tailored for these institutions, which typically have long-standing
relationships with Mercer Mutual's agencies. Mercer Mutual has also refined and
expanded its "main street" business owner program, which targets commercial
coverages for those businesses that are a normal daily part of "main street"
business, such as bakeries, funeral homes, delicatessens, pizzerias, florists
and restaurants. Under this program, insurance packages are written using
existing policy forms and are chosen based on the experience of the underwriting
staff and market opportunities available to existing agents. Mercer Mutual also
introduced a program in 1997 offering a two-tiered pricing approach for
commercial automobile insurance covering light to medium weight trucks and
business-owned private passenger-type vehicles used for commercial purposes. In
addition to a standard rate, Mercer Mutual offered a preferred rate for risks
meeting specified underwriting standards, with the goal to complement the
coverages maintained by its existing accounts as well as to attract new
accounts. To further its goal of increasing its commercial business, in June
1997 Mercer Mutual received approval from the Pennsylvania Department to
transact commercial automobile liability and workers' compensation insurance in
Pennsylvania.
 
     Management believes that it has the opportunity to increase the volume of
casualty business by (i) marketing such business to existing agents, many of
whom have traditionally associated Mercer Mutual with homeowners' property
insurance and may not identify and choose Mercer Mutual for their customers as
providers of casualty line products, and (ii) forming and developing
relationships with new agencies that focus on commercial and casualty business.
Management believes an increasing share of this market is desirable and
attainable given the existing relationships among Mercer Mutual, its agents and
its insureds, as well as the extensive experience and agency relationships of
its commercial business management personnel.
 
     Capital raised in the Conversion is expected to supply additional surplus
necessary to support any substantial increase in commercial and casualty premium
volume.
 
                                       51
<PAGE>   52
 
     Geographic Diversification.  The Company's goal is to geographically
diversify its risk by increasing the level of its business outside of New Jersey
in areas with reduced or different weather-related property loss exposure and in
which management believes insurers generally have been permitted to manage risk
selection and pricing without undue regulatory interference. Concentration of
property insurance in New Jersey has caused Mercer Mutual to be susceptible to
localized severe weather conditions. The Company expects to accomplish
geographic diversification principally through acquisitions.
 
     Upon completion of the Conversion, the Company plans to seek acquisitions
outside of New Jersey. The Company is currently targeting for acquisition
companies located in Pennsylvania and other jurisdictions within the
mid-Atlantic and Mid-western United States. Completion of the Conversion will
provide funds for cash acquisitions and the holding company structure will
facilitate the use of capital stock for acquisitions.
 
     High-Quality Agencies.  Management believes the Insurance Companies have a
strong reputation for personal attention and prompt efficient service to
agencies and insureds. This reputation has allowed the Insurance Companies to
grow and foster their relationships with many high volume agencies, several of
which focus primarily on commercial business and are located in areas which the
Insurance Companies have targeted as growth areas within Pennsylvania and New
Jersey. The Company intends to focus its marketing efforts on maintaining and
improving its relationship with these agencies, as well as on attracting new
high-quality agencies in areas with a substantial potential for growth,
particularly in Pennsylvania. The Company also intends to continue to develop
and tailor its commercial programs to enable its products to meet the needs of
the customers served by its agencies. The religious institutions, "main street"
business and commercial automobile programs are successful examples of this
effort.
 
     Reduced Reliance on Reinsurance.  The Company intends to reduce its
reliance on reinsurance by increasing the maximum exposure retained by the
Insurance Companies on individual property and casualty risks. The Company will
rely on the additional capital raised in the Conversion to protect itself in the
event of individual property losses up to the increased maximum exposure amounts
under its reinsurance agreements. The precise increase in its maximum exposure
will be determined by the Company based on the amount of capital raised in the
Conversion, the Company's evaluation of its ability to incur multiple losses
without a corresponding material adverse effect on its future financial
condition and results of operations, and negotiations with its reinsurers. A
decrease in reinsurance could result in a decrease in ceded premiums and a
corresponding increase in net premium income, but would increase the Company's
risk of loss.
 
PRODUCTS
 
     Mercer Mutual offers a variety of property and casualty insurance products
primarily designed to meet the insurance needs of the businesses and property
owners located in New Jersey and Pennsylvania. MIC currently offers only
workers' compensation insurance to businesses located in New Jersey, but is in
the process of applying to the New Jersey Department for permission to expand
its business to include those types of insurance offered by Mercer Mutual.
 
     Mercer Mutual's products are developed in part by MSO, Inc. which provides
custom product development, rating and statistical services for the property and
casualty lines of its member companies, both mutual and stock. MSO, Inc.'s
programs are currently available in a regional area which includes New Jersey,
Pennsylvania, Maryland and Delaware. It is also licensed in Massachusetts and
Virginia, and its programs may be licensed to companies in other states.
 
     The following tables set forth the direct premiums written, net premiums
earned, net loss ratios, expense ratios and combined ratios by product line of
the Insurance Companies on a consolidated basis for the periods indicated:
 
                                       52
<PAGE>   53
 
<TABLE>
<CAPTION>
                              NINE MONTHS ENDED SEPTEMBER 30,                  YEAR ENDED DECEMBER 31,
                             ---------------------------------   ---------------------------------------------------
                                       % OF              % OF              % OF              % OF              % OF
                              1998     TOTAL    1997     TOTAL    1997     TOTAL    1996     TOTAL    1995     TOTAL
                             -------   -----   -------   -----   -------   -----   -------   -----   -------   -----
                                                                 (IN THOUSANDS)
<S>                          <C>       <C>     <C>       <C>     <C>       <C>     <C>       <C>     <C>       <C>
DIRECT PREMIUMS WRITTEN:
Homeowners.................  $ 9,750    42.4%  $ 9,662    44.9%  $13,057    45.9%  $12,101    48.5%  $11,602    47.0%
Commercial multi-peril.....    5,507    24.0     4,797    22.3     6,374    22.4     5,065    20.3     4,437    17.8
Other liability............    3,181    13.8     3,164    14.7     3,965    13.9     3,486    14.0     3,563    14.3
Fire, allied, inland
  marine...................    2,524    11.0     2,566    11.9     3,413    12.0     3,437    13.8     4,112    16.5
Workers' compensation......    1,182     5.2     1,041     4.9     1,239     4.4       869     3.5       985     3.9
Commercial automobile......      833     3.6       274     1.3       405     1.4        --      --        --      --
                             -------   -----   -------   -----   -------   -----   -------   -----   -------   -----
  Total....................  $22,977   100.0%  $21,504   100.0%  $28,453   100.0%  $24,958   100.0%  $24,699   100.0%
                             =======   =====   =======   =====   =======   =====   =======   =====   =======   =====
NET PREMIUMS EARNED:
Homeowners.................  $ 7,554    44.2%  $ 6,053    45.6%  $ 8,215    45.7%  $10,347    50.1%  $10,182    48.9%
Commercial multi-peril.....    3,185    18.6     2,195    16.5     2,969    16.5     2,903    14.1     2,471    11.9
Other liability............    2,587    15.1     2,033    15.3     2,825    15.7     2,925    14.2     2,829    13.6
Fire, allied, inland
  marine...................    2,256    13.2     2,063    15.5     2,746    15.3     3,250    15.8     3,991    19.2
Workers' compensation......    1,153     6.7       927     7.0     1,235     6.9     1,209     5.8     1,344     6.5
Commercial automobile(1)...      375     2.2        17     0.1       (21)   (0.1)       --      --        --      --
                             -------   -----   -------   -----   -------   -----   -------   -----   -------   -----
  Total....................  $17,110   100.0%  $13,288   100.0%  $17,969   100.0%  $20,634   100.0%  $20,817   100.0%
                             =======   =====   =======   =====   =======   =====   =======   =====   =======   =====
NET LOSS RATIOS:
Homeowners(2)..............     47.0%             73.3%             67.2%             85.4%             78.8%
Commercial multi-peril.....     64.4              49.2              33.5              59.3              34.3
Other liability............     62.0              52.8              70.7             102.7              72.1
Fire, allied, inland
  marine...................     32.5              41.7              49.4              36.3              38.4
Workers' compensation......     55.2              60.2              54.4               5.2              63.8
Commercial automobile(1)...     43.3             170.6            (239.4)               --                --
  Total....................     51.1%             60.5%             58.9%             71.7%             63.9%
EXPENSE RATIOS:
Homeowners.................     44.4%             41.1%             43.1%             38.4%             41.4%
Commercial multi-peril.....     45.0              39.9              31.2              42.1              38.9
Other liability............     43.2              45.9              42.5              39.1              41.8
Fire, allied, inland
  marine...................     41.7              36.9              38.6              37.0              37.0
Workers' compensation......     47.8              40.3              40.7              43.2              39.0
Commercial automobile(1)...     52.6             164.5            (173.4)               --                --
  Total....................     44.4%             41.1%             40.5%             39.1%             40.2%
COMBINED RATIOS(3):
Homeowners.................     91.4%            114.4%            110.3%            123.8%            120.2%
Commercial multi-peril.....    109.4              89.1              64.7             101.4              73.3
Other liability............    105.2              98.7             113.2             141.8             113.9
Fire, allied, inland
  marine...................     74.2              78.6              88.0              73.3              75.3
Workers' compensation......    103.0             100.5              95.1              48.4             102.8
Commercial automobile(1)...     95.9             335.1            (412.8)               --                --
  Total....................     95.5%            101.6%             99.4%            110.8%            104.1%
Industry Combined Ratio....    104.2%            101.0%            101.6%            105.9%            106.4%
</TABLE>
 
- ---------------
 
(1) The Insurance Companies commenced writing commercial automobile coverages in
    1997. The negative balances for commercial automobile result from the
    minimum reinsurance charges incurred in connection with the commencement of
    this line of business.
 
(2) The reduction in the net loss ratio related to homeowners insurance for the
    nine months ended September 30, 1998 as compared to the nine months ended
    September 30, 1997, and for the year ended December 31, 1997 as compared to
    the year ended December 31, 1996, is principally due to improved
                                       53
<PAGE>   54
 
    weather conditions and lower claim volume combined with changes in the
    Insurance Companies' reinsurance programs introduced in 1997. See
    "Management's Discussion and Analyses of Financial Condition and Results of
    Operations -- Results of Operations for the Year Ended December 31, 1997
    compared to the Year Ended December 31, 1996.
 
(3) A combined ratio over 100% means that an insurer's underwriting operations
    are not profitable.
 
  Homeowners
 
     Mercer Mutual's current homeowners policy, introduced in 1987, is a
multi-peril policy providing property and liability coverages and optional
inland marine coverage. The homeowners policy is sold to provide coverage for an
insured's residence. Mercer Mutual markets both a standard and a preferred
homeowner product targeted for both the newly constructed homes and the older
more mature market. As of September 30, 1998, Mercer Mutual had approximately
29,250 homeowners policies in force, with 34.2% of those the preferred product.
 
  Commercial Multi-peril Products.
 
     Commercial Multi-Peril.  Mercer Mutual writes a number of multi-peril
policies in New Jersey and Pennsylvania providing property and liability
coverage to accounts that include all of Mercer Mutual's 3-4 family dwelling
policies, as well as a number of larger apartment risks. Various other
non-business owners risk classes are also written on this policy, such as larger
contractors. As of September 30, 1998, approximately 1,600 multi-peril policies
were in force. Mercer Mutual is working to increase market penetration for this
product because it includes commercial liability risks that have more flexible
and profitable rate structures and also help to diversify exposures and lessen
the impact of property losses on overall results.
 
     Businessowners.  Mercer Mutual introduced a businessowners policy in the
mid-1980s that provides property and liability coverages to small businesses
throughout New Jersey. This product is marketed to several distinct groups: (i)
apartment building owners with 60 or fewer units; (ii) condominium associations;
(iii) business owners who lease their buildings to tenants; (iv) mercantile
businessowners, such as florists, delicatessens, and beauty parlors; and (v)
offices with owner and/or tenant occupancies. As of September 30, 1998,
approximately 2,500 businessowners policies were in force.
 
     Religious Institutions.  Mercer Mutual enhanced its product offerings for
religious institutions in 1997 through the creation of a specialized multi-peril
policy specifically designed for this market segment. The enhanced product
included the introduction of directors and officers coverage, religious
counseling coverage and systems breakdown coverage (through a reinsurance
arrangement). Coverage for child care centers and schools is also available.
 
  Other Liability.
 
     Commercial General Liability.  Mercer Mutual also writes liability coverage
for insureds who do not have property exposure or whose property exposure is
insured elsewhere. The majority of these policies are written for small
contractors such as carpenters, painters or electricians, who choose to
self-insure small property items. Coverage for both premises/operations and
products/completed operations exposures are routinely provided. Coverage is
provided for other exposures such as vacant land and habitational risks. There
were approximately 1,400 commercial general liability policies in force as of
September 30, 1998.
 
     Commercial Umbrella Liability.  Commercial umbrella coverage is available
for insureds who insure their primary general liability exposures with Mercer
Mutual through a businessowners, commercial multi-peril, religious institution
or commercial general liability policy. Limits of $1,000,000 to $5,000,000 are
readily available with higher limits provided if needed. To improve processing
efficiencies and maintain underwriting standards, Mercer Mutual prefers to offer
this coverage as an endorsement to the underlying liability policy rather than
as a separate stand-alone policy.
 
     Personal Excess Liability.  Mercer Mutual writes personal line excess
liability, or "umbrella," policies covering personal liabilities in excess of
amounts covered under Mercer Mutual's homeowners policies. Such
 
                                       54
<PAGE>   55
 
policies are available generally with limits of $1 million to $5 million. Mercer
Mutual does not generally market excess liability policies to individuals unless
they also write an underlying primary liability policy.
 
  Fire, Allied Lines and Inland Marine.
 
     Fire, Allied Lines and Inland Marine.  Fire and allied lines insurance
generally covers fire, lightning, and removal and extended coverage. Inland
marine coverage insures merchandise or cargo in transit and business and
personal property. Mercer Mutual offers these coverages for property exposures
in cases where it is not insuring the companion liability exposures. Generally,
the rates charged on these policies are higher than those for the same property
exposures written on a multi-peril or businessowners policy.
 
     Combination Dwelling Policy.  The current combination dwelling product,
developed in 1987, is a flexible, multi-line package of insurance coverage. It
is targeted to be written on an owner or tenant occupied dwelling of no more
than four families. The dwelling policy combines property and liability
insurance but may also be written on a monoline basis. The property portion is
considered a fire, allied lines and inland marine policy, and the liability
portion is considered an other liability policy.
 
  Commercial Automobile
 
     This product was introduced in New Jersey in 1997 and is designed to cover
light and medium weight trucks used in business, as well as company-owned
private passenger type vehicles. Other specialty classes such as church vans and
funeral directors vehicles can also be covered. The policy is marketed as a
companion offering to Mercer Mutual's businessowners, commercial multi-peril,
religious institution, commercial property or general liability policies.
 
  Workers' Compensation.
 
     The Insurance Companies generally write workers' compensation policies in
conjunction with an otherwise eligible businessowners, commercial multi-peril,
religious institution, commercial property or general liability policy.
Stand-alone workers' compensation policies are available only as a management
accommodation and, as of September 30, 1998, most of the Insurance Companies'
workers' compensation insureds have other Mercer Mutual policies. There were
approximately 1,200 workers' compensation policies in effect as of September 30,
1998.
 
MARKETING
 
     The Insurance Companies market their property and casualty insurance
products in New Jersey and Pennsylvania exclusively through approximately 140
independent agencies, most of which are located in New Jersey. The Insurance
Companies manage their agencies through quarterly business reviews (with
underwriter participation) and establishment of benchmarks/goals for premium
volume and profitability. The Insurance Companies have in recent years
eliminated a number of low volume or unprofitable agencies. All of the Insurance
Companies' independent agencies represent multiple carriers and are established
businesses in the communities in which they operate. The Insurance Companies'
independent agencies generally market and write the full range of the Insurance
Companies' products. The Insurance Companies consider their relationships with
agencies to be good.
 
     For the nine months ended September 30, 1998 and the year ended December
31, 1997, the Insurance Companies' largest agency accounted for approximately
7.6% and 7.3%, respectively, of the Insurance Companies' direct premiums
written, and no other agency accounted for more than 5% of the Insurance
Companies' direct premiums written. For the nine months ended September 30, 1998
and the year ended December 31, 1997, the Insurance Companies' top 10 agencies
accounted for 31.0% and 26.8%, respectively, of direct premiums written, with
the largest agency generating approximately $1.7 million and $2.1 million,
respectively, in premium revenue for the Insurance Companies.
 
     The Insurance Companies emphasize personal contact between their agents and
the policyholders. The Insurance Companies believe that their fast and efficient
service, name recognition, policyholder loyalty and
 
                                       55
<PAGE>   56
 
policyholder satisfaction with agency and claims relationships are the principal
sources of new customer referrals, cross-selling of additional insurance
products and policyholder retention.
 
     The Insurance Companies depend upon their agency force to produce new
business and to provide customer service. The network of independent agencies
also serves as an important source of information about the needs of the
communities served by the Insurance Companies. This information is utilized by
the Insurance Companies to develop new products and new product features.
 
     Agencies are compensated through a fixed base commission with an
opportunity for profit sharing depending on the agency's premiums earned and
loss experience.
 
     The Insurance Companies' independent agencies are monitored and supported
by marketing representatives, who are employees of the Insurance Companies and
who also have principal responsibility for recruiting agencies and training new
agents. To support their marketing efforts, the Insurance Companies hold
seminars for agents and conduct training programs that provide both technical
training about products and sales training on how to market such products. The
Insurance Companies also provide personal computer software to agencies that
allows them to quote rates on homeowners and commercial multi-peril policies.
The Insurance Companies marketing efforts are further supported by their claims
philosophy, which is designed to provide prompt and efficient service, thereby
making the claims process a positive experience for agents and policyholders.
 
UNDERWRITING
 
     The Insurance Companies write their personal and commercial lines by
evaluating each risk with consistently applied standards. The Insurance
Companies maintain information on all aspects of their business that is
regularly reviewed to determine product line profitability. The Insurance
Companies' employ 15 underwriters, who generally specialize in either personal
or commercial lines. Specific information is monitored with regard to individual
insureds that is used to assist the Insurance Companies in making decisions
about policy renewals or modifications. The Insurance Companies' underwriters
have an average of over 12 years of experience as underwriters.
 
     The Insurance Companies rely on information provided by their independent
agencies who, subject to certain guidelines, also act as field underwriters and
pre-screen policy applicants. Their independent agencies have the authority to
sell and bind insurance coverages in accordance with pre-established guidelines.
Agencies' underwriting results are monitored and, on occasion, agencies with
historically poor loss ratios have had their binding authority removed until
more profitable underwriting results were achieved.
 
CLAIMS
 
     Claims on insurance policies written by the Insurance Companies are
received directly from the insured or through the Insurance Companies'
independent agencies. Claims are then assigned to either an in-house adjuster or
an independent adjuster, depending upon the size and complexity of the claim,
who investigates and settles the claim. As of September 30, 1998, the Insurance
Companies had six in-house adjusters and worked with 15 independent adjusters.
Until December 31, 1997 workers' compensation claims were assigned to the GSRA,
an insurance pool which provides for the sharing of workers' compensation losses
under an excess of loss reinsurance treaty. Since January 1, 1998, workers'
compensation claims have been handled in the same manner as all other claims.
 
     Claims settlement authority levels are established for each claims adjuster
based upon his or her level of experience. Multi-line teams exist to handle all
claims. The claims department is responsible for reviewing all claims, obtaining
necessary documentation, estimating the loss reserves and resolving the claims.
 
     The Insurance Companies attempt to minimize claims costs by encouraging the
use of alternative dispute resolution procedures. Less than 22% of all open
claims under the Insurance Companies' policies have resulted in litigation.
Litigated claims are assigned to outside counsel.
 
                                       56
<PAGE>   57
 
REINSURANCE
 
  Reinsurance Ceded
 
     In accordance with insurance industry practice, the Insurance Companies
reinsure a portion of their exposure and pay to the reinsurers a portion of the
premiums received on all policies reinsured. Insurance is ceded principally to
reduce net liability on individual risks, to mitigate the effect of individual
loss occurrences (including catastrophic losses), to stabilize underwriting
results and to increase the Insurance Companies' underwriting capacity.
 
     Reinsurance can be facultative reinsurance or treaty reinsurance. Under
facultative reinsurance, each risk or portion of a risk is reinsured
individually. Under treaty reinsurance, an agreed-upon portion of business
written is automatically reinsured. Reinsurance can also be classified as quota
share reinsurance, pro-rata insurance or excess of loss reinsurance. Under quota
share reinsurance and pro-rata insurance, the ceding company cedes a percentage
of its insurance liability to the reinsurer in exchange for a like percentage of
premiums less a ceding commission, and in turn will recover from the reinsurer
the reinsurer's share of all losses and loss adjustment expenses incurred on
those risks. Under excess reinsurance, an insurer limits its liability to all or
a particular portion of the amount in excess of a predetermined deductible or
retention. Regardless of type, reinsurance does not legally discharge the ceding
insurer from primary liability for the full amount due under the reinsured
policies. However, the assuming reinsurer is obligated to reimburse the ceding
company to the extent of the coverage ceded. The Insurance Companies place all
of their reinsurance either through the use of brokers or directly with the
reinsurance company.
 
     The Insurance Companies determine the amount and scope of reinsurance
coverage to purchase each year based upon their evaluation of the risks
accepted, consultations with reinsurance representatives and a review of market
conditions, including the availability and pricing of reinsurance. The Insurance
Companies' reinsurance arrangements are placed with non-affiliated reinsurers,
and are generally renegotiated annually. For the year ended December 31, 1996,
the Insurance Companies ceded to reinsurers $14.4 million of earned premiums.
For the year ended December 31, 1997, the Insurance Companies ceded to
reinsurers earned premiums of $9.5 million. The significant decrease in ceded
premiums for the year ended December 31, 1997 reflects the effect of a
restructuring of the reinsurance program as of January 1, 1997, which
restructuring is described below. For the nine months ended September 30, 1998,
the Insurance Companies ceded to reinsurers earned premiums of $5.3 million,
compared to $7.0 million in earned premiums ceded to reinsurers for the nine
months ended September 30, 1997.
 
     For the year ended December 31, 1997, the largest exposure retained by the
Insurance Companies on any one individual property risk was $75,000. Excess
reinsurance was provided on a treaty basis in layers as follows: Individual
property risks in excess of $75,000 were covered on an excess of loss basis up
to $250,000 per risk pursuant to various reinsurance treaties. Except for
commercial automobile physical damage, per risk property losses in excess of
$250,000 was reinsured on a proportional basis through treaty coverage or
facultative coverage. Commercial automobile physical damage was reinsured
separately on a quota share and excess of loss basis. The maximum commercial
automobile physical damage exposure was $50,000.
 
     Effective January 1, 1998, the largest exposure retained by the Insurance
Companies on any one individual property risk is $250,000. Individual property
risks in excess of $250,000 are covered on an excess of loss basis pursuant to
various reinsurance treaties. As of January 1, 1998, all property lines of
business, including commercial automobile physical damage, are reinsured under
the same treaties.
 
     For the year ended December 31, 1997, except for workers' compensation,
umbrella liability, and commercial automobile liability, individual casualty
risks that were in excess of $100,000 were covered on an excess of loss basis,
up to $1.2 million per occurrence, pursuant to various reinsurance treaties.
Casualty losses arising from workers' compensation claims were reinsured on a
per occurrence and per person treaty basis by various reinsurers up to $10.0
million through GSRA. Umbrella liability losses were reinsured on a 95% quota
share basis up to $1.0 million and a 100% quota share basis in excess of $1.0
million up to $5.0 million with a ceding commission of 35.0%. Commercial
automobile liability was reinsured separately on a quota share and excess of
loss basis. The maximum commercial automobile liability exposure was $50,000.
The Insurance
 
                                       57
<PAGE>   58
 
Companies also purchased casualty contingency loss excess reinsurance providing
$3.0 million of coverage in excess of $1.2 million.
 
     Effective January 1, 1998, except for umbrella liability, individual
casualty risks that are in excess of $250,000 are covered on an excess of loss
basis up to $1.0 million per occurrence, pursuant to various reinsurance
treaties. Casualty losses in excess of $1.0 million arising from workers'
compensation claims are reinsured up to $10.0 million on a per occurrence and
per person treaty basis by various reinsurers. Umbrella liability losses are
reinsured on a 90% quota share basis up to $1.0 million and a 100% quota share
basis in excess of $1.0 million up to $5.0 million, with a ceding commission of
32.5%. The Insurance Companies also purchase casualty contingency loss excess
reinsurance providing $3.0 million of coverage in excess of $1.0 million.
 
     Catastrophic reinsurance protects the ceding insurer from significant
aggregate loss exposure arising from a single event such as windstorm, hail,
tornado, hurricane, earthquake, riot, blizzard, freezing temperatures or other
extraordinary events. Mercer Mutual purchased layers of excess treaty
reinsurance for catastrophic property losses for 1997, under which Mercer Mutual
reinsured 100% of losses per occurrence in excess of $1.0 million and up to $2.0
million, and 95% of losses per occurrence in excess of $2.0 million, up to a
maximum of $45.0 million per occurrence.
 
     Effective January 1, 1998, Mercer Mutual purchased layers of excess treaty
reinsurance for catastrophic property losses, under which Mercer Mutual
reinsures 100% of losses per occurrence in excess of $1.0 million and up to $2.0
million, and 97.5% of losses per occurrence in excess of $2.0 million, up to a
maximum of $32.0 million per occurrence. Mercer Mutual reduced its catastrophe
excess reinsurance amounts in 1998 because its estimated exposure to
catastrophes, as calculated in 1997 by computer modeling techniques,
demonstrated a significant reduction in such exposures.
 
     Mercer Mutual also has an aggregate excess of loss treaty reinsurance
agreement designed to protect against multiple events each of which is below the
$1.0 million retention under the primary catastrophe reinsurance treaty. During
1997, under this agreement, losses were reinsured for 90% of losses exceeding
70% of annual earned premiums, up to $2.2 million. Such agreement has been
amended so that, effective January 1, 1998, losses are reinsured for 90% of
losses exceeding 70% of annual earned premiums up to $2.7 million.
 
     Effective January 1, 1997, the Insurance Companies terminated their
participation in the Homeowners Pool. Prior to 1997, the Insurance Companies
pooled their New Jersey homeowners business with two other companies providing
homeowners coverage to New Jersey residents. Premiums were ceded to the other
Homeowners Pool participants based on the respective writings reinsured in the
Homeowners Pool. The Insurance Companies in turn assumed reinsurance from the
other participants. Losses were reinsured among the Homeowners Pool participants
on a pro-rata basis in the same proportion premiums were ceded. At January 1,
1997, the Insurance Companies replaced the Homeowners Pool reinsurance with a
combination of the Homeowners Quota Share Program and its existing pro-rata
agreements. The Homeowners Pool was terminated in order to reduce the Insurance
Companies' New Jersey exposure and to eliminate fluctuations in operating
results arising from business assumed from outside the Insurance Companies under
the Homeowners Pool. The restructuring of the reinsurance program caused a
material reduction in both the consolidated net earned premiums and net expense
of Mercer Mutual. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
 
     The insolvency or inability of any reinsurer to meet its obligations to the
Insurance Companies could have a material adverse effect on the results of
operations or financial condition of the Insurance Companies. As of
 
                                       58
<PAGE>   59
 
September 30, 1998 the Company's five largest reinsurers based on percentage of
ceded premiums are set forth in the following table:
 
<TABLE>
<CAPTION>
                                                    PERCENTAGE OF      A.M. BEST
NAME                                                CEDED PREMIUMS    BEST RATING
- ----                                                --------------    -----------
<S>                                                 <C>               <C>
American Re-Insurance Co..........................      23.46%            A+
Motors Insurance Corporation......................      16.79%            A+
Hartford Fire Insurance Co........................      15.55%            A+
Vesta Fire Insurance Corporation..................       3.95%            A
Gerling Global Reinsurance Corp. .................       2.78%            A-
</TABLE>
 
     The following table sets forth the five largest amounts of loss and loss
expenses recoverable from reinsurers on unpaid claims as of September 30, 1998.
 
<TABLE>
<CAPTION>
                                                         LOSS AND
                                                      LOSS EXPENSES
                                                       RECOVERABLE       A.M. BEST
NAME                                                 ON UNPAID CLAIMS     RATING
- ----                                                 ----------------    ---------
                                                      (IN THOUSANDS)
<S>                                                  <C>                 <C>
Franklin Mutual Insurance Co.......................       $1,115             A
Cumberland Mutual Fire Ins. Co.....................        1,102            A+
Hartford Fire Insurance Co.........................          982            A+
Motors Insurance Corporation.......................          831            A+
Odyssey Reinsurance Co.............................          688            A-
</TABLE>
 
     The A+ and A ratings are the second and third highest of A.M. Best's
fifteen ratings. All of the Insurance Companies' other reinsurers are rated "A-"
or better by A.M. Best. According to A.M. Best, companies with a rating of "A-"
or better have a strong ability to meet their ongoing obligations to
policyholders. The Insurance Companies monitor the solvency of reinsurers
through regular review of their financial statements and A.M. Best ratings. The
Insurance Companies have experienced no significant difficulties collecting
amounts due from reinsurers.
 
  Reinsurance Assumed
 
     The Insurance Companies assume reinsurance on a voluntary and non-voluntary
basis. Reinsurance is assumed on an excess of loss basis and pro-rata basis. For
the year ended December 31, 1996 the Insurance Companies assumed $10.3 million
in earned premiums. For the year ended December 31, 1997, the Insurance
Companies assumed $598,000 in earned premiums. The significant decrease in
assumed earned premiums for the year ended December 31, 1997 reflects the
above-described termination by the Insurance Companies of their participation in
the Homeowners Pool effective December 31, 1996, which resulted in the Insurance
Companies no longer assuming business from the other Homeowners Pool
participants. For the nine months ended September 30, 1998, the Insurance
Companies assumed $466,000 in earned premiums compared with $479,000 in earned
premiums assumed for the nine months ended September 30, 1997.
 
     Under its agreement with GSRA, which was terminated effective December 31,
1997, the Insurance Companies assumed reinsurance on a voluntary basis from four
mutual insurance companies providing workers' compensation coverage to New
Jersey businesses. The Insurance Companies assumed 7% of losses incurred by
those carriers in excess of $50,000 up to $250,000 or a maximum of $14,000 per
occurrence. In return, the Insurance Companies assume 7% of the premiums of such
carrier on the same excess of loss basis.
 
     The Insurance Companies are also required by statute to participate in two
residual market pools. The Insurance Companies assume business for workers'
compensation and for property exposures which are not insured in the voluntary
marketplace. The Insurance Companies participate in these residual markets on a
market share basis for the jurisdiction in which it writes business.
 
                                       59
<PAGE>   60
 
LOSS AND LAE RESERVES
 
     Property and Casualty Reserves.  The Insurance Companies are required by
applicable insurance laws and regulations to maintain reserves for payment of
losses and loss adjustment expenses ("LAE") for both reported claims and for
claims incurred but not reported ("IBNR"), arising from the policies they have
issued. These laws and regulations require that provision be made for the
ultimate cost of those claims without regard to how long it takes to settle them
or the time value of money. The determination of reserves involves actuarial and
statistical projections of what the Insurance Companies expect to be the cost of
the ultimate settlement and administration of such claims based on facts and
circumstances then known, estimates of future trends in claims severity, and
other variable factors such as inflation and changing judicial theories of
liability.
 
     The estimation of ultimate liability for losses and LAE is an inherently
uncertain process and does not represent an exact calculation of that liability.
The Insurance Companies' reserve policy recognizes this uncertainty by
maintaining reserves at a level providing for the possibility of adverse
development relative to the estimation process. The Insurance Companies do not
discount their reserves to recognize the time value of money.
 
     When a claim is reported to the Insurance Companies, claims personnel
establish a "case reserve" for the estimated amount of the ultimate payment.
This estimate reflects an informed judgment based upon general insurance
reserving practices and on the experience and knowledge of the estimator
regarding the nature and value of the specific claim, the severity of injury or
damage, and the policy provisions relating to the type of loss. Case reserves
are adjusted by the Insurance Companies' claims staff as more information
becomes available. It is the Insurance Companies' policy to settle each claim as
expeditiously as possible.
 
     The Insurance Companies maintain IBNR reserves to provide for future
reporting of already incurred claims and developments on reported claims. The
IBNR reserve is determined by estimating the Insurance Companies' ultimate net
liability for both reported and IBNR claims and then subtracting the case
reserves for reported claims.
 
     Each quarter, the Insurance Companies compute their estimated ultimate
liability using principles and procedures applicable to the lines of business
written. Such reserves are also considered annually by the Insurance Companies'
independent auditors in connection with their audit of the Insurance Companies'
consolidated financial statements. However, because the establishment of loss
reserves is an inherently uncertain process, there can be no assurance that
ultimate losses will not exceed the Insurance Companies' loss reserves.
Adjustments in aggregate reserves, if any, are reflected in the operating
results of the period during which such adjustments are made. As required by
insurance regulatory authorities, the Insurance Companies submit to the
jurisdictions in which they are licensed a statement of opinion by its appointed
actuary concerning the adequacy of statutory reserves. The results of these
actuarial studies have consistently indicated that reserves are adequate.
Management of the Insurance Companies does not believe the Insurance Companies
are subject to any material potential asbestos or environmental liability
claims.
 
     The following table provides a reconciliation of beginning and ending
consolidated loss and LAE reserve balances of Mercer Mutual for the nine months
ended September 30, 1998 and 1997 and the years ended December 31, 1997, 1996
and 1995 as prepared in accordance with GAAP.
 
                                       60
<PAGE>   61
 
                      RECONCILIATION OF RESERVE FOR LOSSES
                          AND LOSS ADJUSTMENT EXPENSES
 
<TABLE>
<CAPTION>
                                       NINE MONTHS ENDED
                                         SEPTEMBER 30,            YEAR ENDED DECEMBER 31,
                                      --------------------    --------------------------------
                                        1998        1997        1997        1996        1995
                                      --------    --------    --------    --------    --------
                                                           (IN THOUSANDS)
<S>                                   <C>         <C>         <C>         <C>         <C>
Reserves for losses and loss
  adjustment expenses at the
  beginning of period...............  $ 31,872    $ 35,221    $ 35,221    $ 36,176    $ 35,531
Less: Reinsurance recoverables and
  receivables.......................   (12,021)    (15,147)    (15,147)    (16,819)    (17,233)
                                      --------    --------    --------    --------    --------
Net reserves for losses and loss
  adjustment expenses at beginning
  of period.........................    19,851      20,074      20,074      19,357      18,298
                                      --------    --------    --------    --------    --------
Add: Provision for losses and loss
  adjustment expenses for claims
  occurring in:
     The current year...............     9,527       8,865      11,649      16,445      14,251
     Prior years....................      (788)       (827)     (1,055)     (1,644)       (955)
                                      --------    --------    --------    --------    --------
     Total incurred losses and loss
       adjustment expenses..........     8,739       8,038      10,594      14,801      13,296
                                      --------    --------    --------    --------    --------
Less: Loss and loss adjustment
  expenses payments for claims
  occurring in:
     The current year...............     3,064       3,209       4,775       7,715       5,302
     Prior years....................     3,662       5,389       6,042       6,369       6,935
                                      --------    --------    --------    --------    --------
     Total losses and loss
       adjustment expenses..........     6,726       8,598      10,817      14,084      12,237
                                      --------    --------    --------    --------    --------
Net reserves for losses and loss
  adjustment expenses at end of
  period............................    21,864      19,514      19,851      20,074      19,357
Add: Reinsurance recoverables and
  receivables.......................     8,467      13,298      12,021      15,147      16,819
                                      --------    --------    --------    --------    --------
Reserves for losses and loss
  adjustment expenses at end of
  period............................  $ 30,331    $ 32,812    $ 31,872    $ 35,221    $ 36,176
                                      ========    ========    ========    ========    ========
</TABLE>
 
     The following table shows the development of the consolidated reserves for
unpaid losses and LAE from 1987 through 1997 for the Insurance Companies on a
GAAP basis. The top line of the table shows the liabilities at the balance sheet
date, including losses incurred but not yet reported. The upper portion of the
table shows the cumulative amounts subsequently paid as of successive years with
respect to the liability. The lower portion of the table shows the reestimated
amount of the previously recorded liability based on experience as of the end of
each succeeding year. The estimates change as more information becomes known
about the frequency and severity of claims for individual years. The redundancy
(deficiency) exists when the reestimated liability at each December 31 is less
(greater) than the prior liability estimate. The "cumulative redundancy
(deficiency)" depicted in the table, for any particular calendar year,
represents the aggregate change in the initial estimates over all subsequent
calendar years.
 
                                       61
<PAGE>   62
<TABLE>
<CAPTION>
                                                                     YEAR ENDED DECEMBER 31,
                                          -----------------------------------------------------------------------------
                                           1987      1988      1989      1990      1991      1992      1993      1994
                                          -------   -------   -------   -------   -------   -------   -------   -------
                                                                         (IN THOUSANDS)
<S>                                       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Liability for unpaid losses and LAE net
  of reinsurance recoverable............  $ 7,646   $ 9,266   $13,247   $16,698   $18,509   $20,067   $18,995   $18,298
Cumulative amount of liability paid
  through:
  One year later........................    2,760     3,268     4,702     5,195     5,621     6,329     6,023     6,935
  Two years later.......................    4,101     5,129     7,282     8,091     8,587     9,940     9,786    10,272
  Three years later.....................    5,181     6,684     9,342    10,307    11,315    12,723    12,144    12,336
  Four years later......................    5,825     7,899    10,888    12,112    13,162    14,160    13,590
  Five years later......................    6,363     8,643    11,694    12,904    14,033    14,852
  Six years later.......................    6,627     9,063    11,997    13,262    14,389
  Seven years later.....................    6,800     9,169    12,096    13,470
  Eight years later.....................    6,857     9,236    12,177
  Nine years later......................    6,851     9,275
  Ten years later.......................    6,864
Liability estimated as of:
  One year later........................    7,895    10,446    14,766    16,168    17,400    18,246    17,746    17,344
  Two years later.......................    7,657    10,914    13,989    15,632    16,293    17,603    17,088    16,860
  Three years later.....................    7,581    10,330    13,540    14,787    15,973    16,985    16,779    16,495
  Four years later......................    7,256    10,076    12,724    14,209    15,411    16,490    16,244
  Five years later......................    7,272     9,603    12,643    13,945    15,298    16,225
  Six years later.......................    7,100     9,595    12,556    13,996    15,153
  Seven years later.....................    7,055     9,586    12,518    13,963
  Eight years later.....................    7,035     9,522    12,517
  Nine years later......................    7,033     9,529
  Ten years later.......................    7,040
Cumulative total redundancy
  (deficiency)..........................      606      (263)      730     2,735     3,356     3,842     2,751     1,803
Gross liability -- end of year..........                                                     38,472    33,308    35,531
Reinsurance recoverables................                                                     18,405    14,313    17,233
                                                                                            -------   -------   -------
Net liability -- end of year............                                                    $20,067   $18,995   $18,298
                                                                                            =======   =======   =======
Gross reestimated liability-latest......                                                     33,323    28,775    31,011
Reestimated reinsurance
  recoverables-latest...................                                                     17,097    12,531    14,515
                                                                                            -------   -------   -------
Net reestimated liability-latest........                                                     16,225    16,244    16,495
                                                                                            =======   =======   =======
Gross cumulative redundancy.............                                                      5,149     4,533     4,520
                                                                                            =======   =======   =======
 
<CAPTION>
                                            YEAR ENDED DECEMBER 31,
                                          ---------------------------
                                           1995      1996      1997
                                          -------   -------   -------
                                                (IN THOUSANDS)
<S>                                       <C>       <C>       <C>
Liability for unpaid losses and LAE net
  of reinsurance recoverable............  $19,357   $20,074   $19,851
Cumulative amount of liability paid
  through:
  One year later........................    6,368     6,042        --
  Two years later.......................    9,554
  Three years later.....................
  Four years later......................
  Five years later......................
  Six years later.......................
  Seven years later.....................
  Eight years later.....................
  Nine years later......................
  Ten years later.......................
Liability estimated as of:
  One year later........................   17,712    19,018        --
  Two years later.......................   17,247
  Three years later.....................
  Four years later......................
  Five years later......................
  Six years later.......................
  Seven years later.....................
  Eight years later.....................
  Nine years later......................
  Ten years later.......................
Cumulative total redundancy
  (deficiency)..........................    2,110     1,056        --
Gross liability -- end of year..........   36,176    35,221    31,872
Reinsurance recoverables................   16,819    15,147    12,021
                                          -------   -------   -------
Net liability -- end of year............  $19,357   $20,074   $19,851
                                          =======   =======   =======
Gross reestimated liability-latest......   30,974    31,539
Reestimated reinsurance
  recoverables-latest...................   13,726    12,521
                                          -------   -------
Net reestimated liability-latest........   17,247    19,018
                                          =======   =======
Gross cumulative redundancy.............    5,202     3,682
                                          =======   =======
</TABLE>
 
                                       62
<PAGE>   63
 
INVESTMENTS
 
     On a consolidated basis, all of Mercer Mutual's investment securities are
classified as available for sale and are carried at fair market value.
 
     An important component of the consolidated operating results of Mercer
Mutual has been the return on invested assets. The Company's investment
objectives are (i) to maximize current yield, (ii) to maintain safety of capital
through a balance of high quality, diversified investments which minimize risk,
(iii) to maintain adequate liquidity for its insurance operations, (iv) to meet
regulatory requirements, and (v) to increase surplus through appreciation.
 
     The Board of Directors sets the investment policy of the Company, which
requires that investments be made in a portfolio consisting of bonds, common
stock and short-term money market instruments. The Company's equity investments
are required to be concentrated in larger capitalization, quality companies. The
policy does not permit investment in unincorporated businesses, private
placements or direct mortgages, foreign denominated securities, financial
guarantees or commodities.
 
     The following table sets forth certain consolidated information concerning
Mercer Mutual's investments.
 
<TABLE>
<CAPTION>
                                 AT SEPTEMBER 30, 1998     AT DECEMBER 31, 1997    AT DECEMBER 31, 1996
                                 ----------------------    --------------------    --------------------
                                               MARKET                   MARKET                  MARKET
                                  COST(2)       VALUE      COST(2)      VALUE      COST(2)      VALUE
                                 ---------    ---------    --------    --------    --------    --------
                                                             (IN THOUSANDS)
<S>                              <C>          <C>          <C>         <C>         <C>         <C>
Fixed income securities(1):
  United States government and
     government agencies.......   $22,585      $23,008     $25,195     $25,407     $23,702     $23,691
  Obligations of states and
     political subdivisions....     6,890        7,082       3,396       3,517       4,313       4,343
  Industrial and
     miscellaneous.............       753          769         300         300          --          --
  Mortgage-backed securities...     5,354        5,215       6,106       5,723       7,631       6,930
                                  -------      -------     -------     -------     -------     -------
          Total fixed income
            securities.........    35,582       36,074      34,997      34,947      35,646      34,964
Equity securities..............     8,539       12,867       6,948      10,852       5,892       7,795
                                  -------      -------     -------     -------     -------     -------
          Total................   $44,121      $48,941     $41,945     $45,799     $41,538     $42,759
                                  =======      =======     =======     =======     =======     =======
</TABLE>
 
- ---------------
(1) In the consolidated financial statements of Mercer Mutual, investments are
    carried at fair value as established by quoted market prices on secondary
    markets.
 
(2) Original cost of equity securities; original cost of fixed income securities
    adjusted for amortization of premium and accretion of discount.
 
                                       63
<PAGE>   64
 
     The table below contains consolidated information concerning the investment
ratings of Mercer Mutual's fixed maturity investments at September 30, 1998.
 
<TABLE>
<CAPTION>
                                            AMORTIZED    MARKET
      TYPE/RATINGS OF INVESTMENT(1)           COST        VALUE     PERCENTAGES(2)
      -----------------------------         ---------    -------    --------------
                                                        (IN THOUSANDS)
<S>                                         <C>          <C>        <C>
U.S. Government and agencies..............   $22,585     $23,008         63.8%
AAA.......................................    11,164      11,177         31.0
AA........................................       770         803          2.2
A.........................................       963         982          2.7
BBB.......................................       100         104          0.3
                                             -------     -------        -----
          Total...........................   $35,582     $36,074        100.0%
                                             =======     =======        =====
</TABLE>
 
- ---------------
(1) The ratings set forth in this table are based on the ratings, if any,
    assigned by Standard & Poor's Corporation ("S&P"). If S&P's ratings were
    unavailable, the equivalent ratings supplied by Moody's Investors Services,
    Inc., Fitch Investors Service, Inc. or the NAIC were used where available.
 
(2) Represents percent of market value for classification as a percent of total
    for each portfolio.
 
     The table below sets forth the maturity profile of Mercer Mutual's
consolidated fixed maturity investments as of September 30, 1998:
 
<TABLE>
<CAPTION>
                                                    AMORTIZED    MARKET
MATURITY                                             COST(1)      VALUE     PERCENTAGES(2)
- --------                                            ---------    -------    --------------
                                                                (IN THOUSANDS)
<S>                                                 <C>          <C>        <C>
1 year or less....................................   $   100     $   101          0.3%
More than 1 year through 5 years..................     3,180       3,304          9.2
More than 5 years through 10 years................    20,870      21,237         58.9
More than 10 years................................     6,078       6,217         17.2
Mortgage-backed securities(3).....................     5,354       5,215         14.4
                                                     -------     -------        -----
          Total...................................   $35,582     $36,074        100.0%
                                                     =======     =======        =====
</TABLE>
 
- ---------------
(1) Fixed maturities are carried at market value in the consolidated financial
    statements of Mercer Mutual.
 
(2) Represents percent of market value of the classification as a percent of the
    total.
 
(3) Mortgage backed securities consist of mortgage pass-through holdings and
    securities collateralized by home equity loans. These securities follow a
    structured principal repayment schedule and are of high credit quality rated
    "AAA" or better by Standard & Poor's. These securities are presented
    separately in the maturity schedule due to the inherent risk associated with
    prepayment or early authorization. The average duration of this portfolio is
    3.6 years.
 
     The average duration of Mercer Mutual's fixed maturity investments,
excluding mortgage backed securities which are subject to paydown, as of
September 30, 1998 was approximately 5.7 years. As a result, the market value of
the Company's investments may fluctuate significantly in response to changes in
interest rates. In addition, the Company may experience investment losses to the
extent its liquidity needs require the disposition of fixed maturity securities
in unfavorable interest rate environments.
 
                                       64
<PAGE>   65
 
     Mercer Mutual's consolidated net investment income, average cash and
invested assets and return on average cash and invested assets for the nine
months ended September 30, 1998 and 1997 and the years ended December 31, 1997,
1996 and 1995 and were as follows:
 
<TABLE>
<CAPTION>
                                       NINE MONTHS
                                   ENDED SEPTEMBER 30,        YEAR ENDED DECEMBER 31,
                                   --------------------    -----------------------------
                                     1998        1997       1997       1996       1995
                                   --------    --------    -------    -------    -------
                                                      (IN THOUSANDS)
<S>                                <C>         <C>         <C>        <C>        <C>
Average invested assets..........  $52,241     $46,439     $46,970    $44,728    $39,746
Net investment income............    1,656       1,793       2,350      2,289      2,132
Return on average invested
  assets.........................      4.2%        5.2%        5.0%       5.1%       5.4%
</TABLE>
 
A.M. BEST RATING
 
     A.M. Best, which rates insurance companies based on factors of concern to
policyholders, currently assigns an "A-" (Excellent) rating (its fourth highest
rating category out of 15 categories) to the Insurance Companies as a group.
A.M. Best assigns "A" or "A-" ratings to companies which, in its opinion, have
demonstrated excellent overall performance when compared to the standards
established by A.M. Best. Companies rated "A" and "A-" have a strong ability to
meet their obligations to policyholders over a long period of time. In
evaluating a company's financial and operating performance, A.M. Best reviews
the company's profitability, leverage and liquidity, as well as the company's
book of business, the adequacy and soundness of its reinsurance, the quality and
estimated market value of its assets, the adequacy of its loss reserves, the
adequacy of its surplus, its capital structure, the experience and competency of
its management and its market presence. No assurance can be given that A.M. Best
will not reduce the Insurance Companies' current rating in the future.
 
     In its 1998 ratings report on the Insurance Companies, in which A.M. Best
assigned the Insurance Companies its current "A-" rating, A.M. Best also stated
that due to Mercer Mutual's significant catastrophe exposure resulting from the
geographic concentration of its business, the Insurance Companies' results
continue to be heavily influenced by weather related events such as hurricanes
and winter storm activity. In addition, A.M. Best noted that as the Insurance
Companies continue to penetrate the commercial market, they will be subject to
such market's increasingly competitive environment. See "-- Competition."
However, A.M. Best also recognized the Insurance Companies' continuing efforts
to mitigate their catastrophe exposure, as well as to diversify their book of
business. Accordingly, A.M. Best viewed the Insurance Companies' ratings outlook
as stable.
 
     In 1997 and again in 1998, management met with A.M. Best personnel to
discuss the measures the Insurance Companies are implementing to mitigate Mercer
Mutual's catastrophe exposure. These measures include an increase in the rates
charged for homeowners insurance, the termination of relationships with
unprofitable agencies, improving their mix of business through an increase in
commercial and casualty writings, the planned geographic diversification of its
business through acquisitions, and the planned improvement of capital strength
through the Offerings. A.M. Best uses independent computer modeling systems to
measure an insurance company's catastrophe exposure. One of the measurements
generated by such computer modeling systems and utilized by A.M. Best in the
rating process is Probable Maximum Loss. From August 31, 1996 to August 31,
1997, the Probable Maximum Loss (before catastrophe reinsurance) of the
Insurance Companies has been reduced by 69.5% from $64.9 million to $19.8
million. See "Risk Factors -- A.M. Best Rating."
 
COMPETITION
 
     The property and casualty insurance market is highly competitive. The
Insurance Companies compete with stock insurance companies, mutual companies,
local cooperatives and other underwriting organizations. Certain of these
competitors have substantially greater financial, technical and operating
resources than the Insurance Companies. The Insurance Companies' ability to
compete successfully in their principal markets is dependent upon a number of
factors, many of which (including market and competitive conditions) are
 
                                       65
<PAGE>   66
 
outside the Insurance Companies' control. Many of the lines of insurance written
by the Insurance Companies are subject to significant price competition. Some
companies may offer insurance at lower premium rates through the use of salaried
personnel or other methods, rather than through independent agents paid on a
commission basis, as the Insurance Companies do. In addition to price,
competition in the lines of business written by the Insurance Companies is based
on quality of the products, quality and speed of service (including claims
service), financial strength, ratings, distribution systems and technical
expertise.
 
REGULATION
 
     General.  Insurance companies are subject to supervision and regulation in
the states in which they transact business. Such supervision and regulation
relates to numerous aspects of an insurance company's business and financial
condition. The primary purpose of such supervision and regulation is the
protection of policyholders. The extent of such regulation varies, but generally
derives from state statutes which delegate regulatory, supervisory and
administrative authority to state insurance departments. Accordingly, the
authority of the state insurance departments includes the establishment of
standards of solvency which must be met and maintained by insurers, the
licensing to do business of insurers and agents, the nature of and limitations
on investments, premium rates for property and casualty insurance, the
provisions which insurers must make for current losses and future liabilities,
the deposit of securities for the benefit of policyholders, the approval of
policy forms, notice requirements for the cancellation of policies and the
approval of certain changes in control. State insurance departments also conduct
periodic examinations of the affairs of insurance companies and require the
filing of annual and other reports relating to the financial condition of
insurance companies.
 
     Examinations.  Examinations are regularly conducted by the Pennsylvania
Department and the New Jersey Department every three to five years. Because the
volume of Mercer Mutual's business in Pennsylvania to date has been minimal and
Mercer Mutual did not change its domicile from New Jersey to Pennsylvania until
October 1997, Mercer Mutual has never been examined by the Pennsylvania
Department. The New Jersey Department's last examination of Mercer Mutual and
MIC was as of December 31, 1995. These examinations did not result in any
adjustments to the financial position of either of the Insurance Companies. In
addition, there were no substantive qualitative matters indicated in the
examination reports that had a material adverse impact on the operations of the
Insurance Companies.
 
     NAIC Requirements.  In addition to state-imposed insurance laws and
regulations, the NAIC has adopted risk-based capital ("RBC") requirements that
require insurance companies to calculate and report information under a
risk-based formula that attempts to measure statutory capital and surplus needs
based on the risks in a company's mix of products and investment portfolio.
Under the formula, a company first determines its Authorized Control Level
risk-based capital ("ACL") by taking into account (i) the risk with respect to
the insurer's assets; (ii) the risk of adverse insurance experience with respect
to the insurer's liabilities and obligations, (iii) the interest rate risk with
respect to the insurer's business; and (iv) all other business risks and such
other relevant risks as are set forth in the RBC instructions. A company's
"Total Adjusted Capital" is the sum of statutory capital and surplus and such
other items as the RBC instructions may provide. The formula is designed to
allow state insurance regulators to identify potential weakly capitalized
companies.
 
     The requirements provide for four different levels of regulatory attention.
The "Company Action Level" is triggered if a company's Total Adjusted Capital is
less than 2.0 times its ACL but greater than or equal to 1.5 times its ACL. At
the Company Action Level, the company must submit a comprehensive plan to the
regulatory authority which discusses proposed corrective actions to improve the
capital position. The "Regulatory Action Level" is triggered if a company's
Total Adjust Capital is less than 1.5 times but greater than or equal to 1.0
times its ACL. At the Regulatory Action Level, the regulatory authority will
perform a special examination of the company and issue an order specifying
corrective actions that must be followed. The "Authorized Control Level" is
triggered if a company's Total Adjusted Capital is than 1.0 times but greater
than or equal to 0.7 times its ACL, and the regulatory authority may take action
it deems necessary, including placing the company under regulatory control. The
"Mandatory Control Level" is triggered if a company's Total Adjusted Capital is
less than 0.7 times its ACL, and the regulatory authority is mandated to place
the company under its control. The Insurance Companies have never failed to
exceed these required
 
                                       66
<PAGE>   67
 
levels of capital. There can be no assurance, however, that the capital
requirements applicable to the business of the Insurance Companies will not
increase in the future.
 
     The NAIC has also developed a set of eleven financial ratios, referred to
as the Insurance Regulatory Information System (IRIS), for use by state
insurance regulators in monitoring the financial condition of insurance
companies. The NAIC has established an acceptable range of values for each of
the IRIS financial ratios. Generally, an insurance company will become the
subject of increased scrutiny where four or more of its IRIS ratio results fall
outside the range deemed acceptable by the NAIC. The nature of increased
regulatory scrutiny resulting from IRIS ratio results that are outside the
acceptable range is subject to the judgment of the applicable state insurance
department, but generally will result in accelerated review of annual and
quarterly filings. Depending on the nature and severity of the underlying cause
of the IRIS ratio results being outside the acceptable range, increased
regulatory scrutiny could range from increased but informal regulatory oversight
to placing a company under regulatory control.
 
     During the years ended December 31, 1995 and 1996, either or both of the
Insurance Companies reported results outside the acceptable range for the
following IRIS tests: the two-year overall operating ratio and the change in net
writings. The two-year overall operating ratio is a measure of company
profitability which combines three ratios: the loss ratio, plus the expense
ratio, minus the investment income ratio. A ratio result below 100% indicates a
profit, and a ratio result above 100% indicates a loss. The change in net
writings ratio is a measurement of the stability of a company's operations. For
the year ended December 31, 1997, neither of the Insurance Companies reported
results outside the acceptable range for any IRIS test. The table below sets
forth IRIS ratios outside the acceptable range for the Insurance Companies
during 1995, 1996 and 1997:
 
<TABLE>
<CAPTION>
                                             INSURANCE
                                              VALUES
                                            EQUAL TO OR        MERCER MUTUAL                MIC
                                           -------------    --------------------    --------------------
RATIO NAME/DESCRIPTION                     OVER    UNDER    1997    1996    1995    1997    1996    1995
- ----------------------                     ----    -----    ----    ----    ----    ----    ----    ----
<S>                                        <C>     <C>      <C>     <C>     <C>     <C>     <C>     <C>
Change in net writings...................   33      (33)                                    263     (84)
Two-year overall operating ratio.........  100                               100                    109
</TABLE>
 
     For Mercer Mutual, the 1995 two-year overall operating ratio was outside
the acceptable range. Operating results were adversely impacted by winter storms
and wind storms which resulted in significant losses in 1994, thereby increasing
the 1995 two-year operating ratio.
 
     For MIC, the 1995 two-year overall operating ratio was outside the
acceptable range. This ratio was negatively impacted by MIC's share of losses
from winter storms and wind storms it assumed from Mercer Mutual under terms of
their reinsurance treaties at the time. (These storms occurred in 1994 and
increased MIC's 1995 two-year operating ratio.) The treaties with Mercer Mutual
were terminated as of January 1, 1995. The termination of the intercompany
reinsurance agreements resulted in the return of unearned premium reserves from
MIC to Mercer Mutual. As a result, net writings dropped dramatically in 1995.
The drop in net premium writings in 1995 caused the unusual results for the 1996
and 1995 net writings ratio.
 
     Guaranty Fund Laws.  The states in which the Insurance Companies do
business (New Jersey and Pennsylvania) have guaranty fund laws under which
insurers doing business in such states can be assessed on the basis of premiums
written by the insurer in that state in order to fund policyholder liabilities
of insolvent insurance companies. Under these laws in general, an insurer is
subject to assessment, depending upon its market share of a given line of
business, to assist in the payment of policyholder claims against insolvent
insurers. The Insurance Companies make accruals for their portion of assessments
related to such insolvencies when notified of assessments by the guaranty
associations.
 
     New and Proposed Legislation and Regulations.  The property and casualty
insurance industry has recently received a considerable amount of publicity
because of rising insurance costs and the unavailability of insurance. New
regulations and legislation are being proposed to limit damage awards, to
control plaintiffs' counsel fees, to bring the industry under regulation by the
federal government and to control premiums, policy terminations and other policy
terms. It is not possible to predict whether, in what form or in what
jurisdictions any of these proposals might be adopted or the effect, if any, on
the Insurance Companies. However, most of
 
                                       67
<PAGE>   68
 
these proposals relate to automobile insurance. The Insurance Companies do not
write, nor do they have any present intention to write in the future, personal
automobile insurance (except through businesses which may be acquired through
acquisition), and the Insurance Companies' commercial automobile insurance
business is not material to the business of the Insurance Companies.
 
     Dividends.  The Insurance Companies are restricted by the insurance laws of
their respective states of domicile as to the amount of dividends or other
distributions they may pay without notice to or the prior approval of the state
regulatory authority. With respect to Mercer Mutual, the Pennsylvania
Department's approval of the Conversion is subject to, among other things, the
condition that for a period of three years following the Conversion, Mercer
Mutual may not declare or pay a dividend to the Company without the approval of
the Pennsylvania Department. After such three-year period has expired, Mercer
Mutual's ability to declare and pay dividends to the Company will be subject to
Pennsylvania law, which provides that the maximum amount that may be paid by
Mercer Mutual during any twelve-month period after notice to, but without prior
approval of, the Pennsylvania Department cannot exceed the greater of 10% of
Mercer Mutual's statutory surplus as reported on the most recent annual
statement filed with the Pennsylvania Department, or the net income of Mercer
Mutual for the period covered by such annual statement. If the dividend
restrictions contained in the Orders were not in effect, then as of December 31,
1997, amounts available for payment of dividends by Mercer Mutual to the Company
in 1998 without the prior approval of the Pennsylvania Department would have
been approximately $2.0 million.
 
     Holding Company Laws.  Most states have enacted legislation that regulates
insurance holding company systems. Each insurance company in a holding company
system is required to register with the insurance supervisory agency of its
state of domicile and furnish information concerning the operations of companies
within the holding company system that may materially affect the operations,
management or financial condition of the insurers within the system. Pursuant to
these laws, the respective insurance departments may examine the Insurance
Companies and the Company at any time, require disclosure of material
transactions by the Insurance Companies and the Company and require prior notice
of approval of certain transactions, such as "extraordinary dividends" from the
Insurance Companies to the Company.
 
     All transactions within the holding company system affecting the Insurance
Companies and the Company must be fair and equitable. Notice of certain material
transactions between an insurer and any person in its holding company system is
required to be given to the applicable insurance commissioner and, in some
states, certain of such transactions cannot be consummated without the prior
approval of the applicable insurance commissioner.
 
     Approval of the applicable insurance commissioner is required prior to
consummation of transactions affecting the control of an insurer. In New Jersey
and Pennsylvania, the acquisition of 10% or more of the outstanding capital
stock of an insurer or its holding company is presumed to be a change in
control. Pennsylvania law also prohibits any person from (i) making a tender
offer for, or a request or invitation for tenders of, or seeking to acquire or
acquiring any voting security of a Pennsylvania insurer if, after the
consummation of such an acquisition, such person would be in control of such
insurer, or (ii) effecting or attempting to effect an acquisition of control of
or merger with a Pennsylvania insurer, unless such offer, request, invitation,
acquisition, effectuation or attempt has received the prior approval of the
Pennsylvania Department.
 
     New Antitakeover Legislation.  On December 21, 1998, the Governor of
Pennsylvania signed into law legislation that prohibits, from the time a mutual
insurance company files with the Pennsylvania Department an application to
convert to a stock company until the effective date of the conversion, any offer
to acquire, announcement of an offer to acquire or acquisition of such
converting company (the "Antitakeover Law"). Any such offer, announcement or
acquisition would constitute a violation of the Act as well as the Pennsylvania
holding company law described above. The Antitakeover Law only applies to
conversion applications filed on or after December 21, 1998.
 
                                       68
<PAGE>   69
 
OFFER TO ACQUIRE MERCER MUTUAL
 
     On March 3, 1998, Mercer Mutual received an unsolicited offer from Franklin
Mutual Insurance Company ("Franklin") to purchase from Mercer Mutual, upon the
consummation of the Conversion, all of the to-be-issued capital stock of Mercer
Mutual for a purchase price equal to the audited book value of Mercer Mutual at
December 31, 1997 under generally accepted accounting principles. Under
Franklin's proposal, Mercer Mutual was asked to amend the Plan to provide that
policyholders would receive a distribution equal to such purchase price in
accordance with a fair and equitable formula approved by the Pennsylvania
Department. Franklin also committed to contribute an additional $5 million of
capital to Mercer Mutual. Franklin made such offer without receiving the prior
approval of the Pennsylvania Department. Mercer Mutual's Board of Directors
unanimously rejected such offer because it was not in the best interests of
Mercer Mutual and its policyholders and other constituents. On April 3, 1998,
Mercer Mutual received a letter from Franklin reextending its offer. Such
reextention was also made without the prior approval of the Pennsylvania
Department. Mercer Mutual's Board of Directors again unanimously rejected such
offer. Mercer Mutual believes, based on the advice of its counsel, that if the
Antitakeover Law were applicable to the conversion application approved by the
Orders (i.e., if Mercer Mutual had filed such application on or after December
21, 1998), Franklin's offers would be expressly prohibited by the Antitakeover
Law.
 
LEGAL PROCEEDINGS
 
     Franklin Litigation.  In May 1998, Franklin filed with the Pennsylvania
Department a petition to intervene and request for a full adjudicatory hearing
with respect to all proceedings of the Pennsylvania Department concerning Mercer
Mutual's application for approval of the Plan. On October 20, 1998, the
Pennsylvania Department issued the Orders approving the Plan and concluding
that, among other things, in its review of the Plan, the Pennsylvania Department
considered Franklin's petition to intervene and request for adjudicatory hearing
as public comments, and not as formal pleadings because formal pleadings are not
required or appropriate in the review of a proposed plan of conversion under the
Act. Therefore, no further action was required to be taken by the Pennsylvania
Department in response to Franklin's petition and request. On October 27, 1998,
Franklin filed with the Pennsylvania Department an appeal of the Orders and a
request for a full adjudicatory hearing. On November 6, 1998, the Pennsylvania
Department rejected Franklin's appeal because the Pennsylvania Department had no
jurisdiction to entertain such appeal. On November 9, 1998, Franklin filed a
petition for review in the nature of an appeal with the Pennsylvania
Commonwealth Court objecting to and requesting that the Court reverse the Orders
(the "Franklin Action"). Mercer Mutual has filed with the Commonwealth Court a
notice to intervene in the Franklin Action. The Franklin Action is still
pending. Mercer Mutual believes that Franklin's claims in the Franklin Action
are without merit, and Mercer Mutual intends to vigorously contest such claims.
However, no assurance can be given that the Pennsylvania Department or Mercer
Mutual will ultimately prevail in the Franklin Action or in any other litigation
relating to the Conversion. For a description of the potentially adverse
consequences that may result from the Franklin Action and other litigation that
may affect the Conversion, see "Risk Factors -- Possible Adverse Impact of
Litigation."
 
     Defamation Action.  In July 1998, Mercer filed an action in the
Pennsylvania Court of Common Pleas for Chester County against Franklin and its
president, George H. Guptill, Jr., for intentional and negligent defamation
relating to statements made by Franklin and Mr. Guptill in a June 5, 1998 press
release that Mercer Mutual believes are false and misleading. In August 1998,
Mercer Mutual dismissed such action and simultaneously filed the same action in
the Superior Court of New Jersey for Mercer County. Franklin and Mr. Guptill
have filed counterclaims against Mercer Mutual and its president, William C.
Hart, alleging that certain statements made by Mercer Mutual and Mr. Hart in a
July 2, 1998 press release were defamatory. Franklin and Mr. Guptill are seeking
compensatory and punitive damages, interest, costs and attorneys' fees. Mercer
Mutual and Mr. Hart believe that Franklin's and Mr. Guptill's allegations in
their counterclaim are without merit and intend to vigorously defend this
action. The bylaws of Mercer Mutual require Mercer Mutual to indemnify Mr. Hart
against expenses (including attorneys' fees), amounts paid in settlement,
judgments, and fines incurred by Mr. Hart in connection with this action, except
that no indemnification is
 
                                       69
<PAGE>   70
 
permitted if the act giving rise to the claim is determined by a court to
constitute willful misconduct or recklessness.
 
     Other Litigation.  In addition to the foregoing, the Insurance Companies
are parties to litigation in the normal course of business. Based upon
information presently available to them, the Insurance Companies' do not
consider any such litigation to be material. However, given the uncertainties
attendant to litigation, there can be no assurance that the Insurance Companies'
results of operations and financial condition will not be materially adversely
affected by any such litigation.
 
INTERCOMPANY AGREEMENTS
 
     Mercer Mutual and MIC are parties to a Management Agreement pursuant to
which, in exchange for functions and services performed by employees of Mercer
Mutual, all expenses for the workers' compensation business conducted by the
Insurance Companies are borne by MIC. Mercer Mutual and MIC are also parties,
together with QHC, to a Consolidated Tax Allocation Agreement whereby each
company is allocated a pro rata share of the consolidated income tax expense
based upon its contribution of taxable income to the consolidated group.
 
PROPERTIES
 
     The Company's and Insurance Companies' main offices are located at 10 North
Highway 31, Pennington, New Jersey in a 14,357 square foot facility owned by
Mercer Mutual. The Company also owns a tract of land adjacent to its main office
property. Mercer Mutual also leases 1,000 square feet of office space in
Yardley, Pennsylvania.
 
EMPLOYEES
 
     As of September 30, 1998, the total number of full-time equivalent
employees of Mercer Mutual was 48. None of these employees are covered by a
collective bargaining agreement and Mercer Mutual believes that employee
relations are good. MIC does not have any employees.
 
                                       70
<PAGE>   71
 
                           MANAGEMENT OF THE COMPANY
 
DIRECTORS
 
     The Board of Directors of the Company consists of Roland D. Boehm, James J.
Freda, William C. Hart, George T. Hornyak, Richard U. Niedt, Andrew R. Speaker,
and Richard G. Van Noy, each of whom presently serves as a director of Mercer
Mutual. The Board is divided into three classes with directors serving for
three-year terms with approximately one-third of the directors being elected at
each annual meeting of shareholders, beginning with the first annual meeting of
shareholders following the Conversion. Messrs. Boehm and Freda have terms of
office expiring at the first annual meeting, Messrs. Hart, Niedt and Van Noy
have terms of office expiring at the annual meeting to be held one year
thereafter, and Messrs. Hornyak and Speaker have terms of office expiring at the
annual meeting to be held two years thereafter.
 
     The following table sets forth certain information regarding the directors
of the Company.
 
<TABLE>
<CAPTION>
                           AGE AT                                BUSINESS EXPERIENCE
                        SEPTEMBER 30,    DIRECTOR              FOR THE LAST FIVE YEARS;
                            1998         SINCE(1)                OTHER DIRECTORSHIPS
                        -------------    --------              ------------------------
<S>                     <C>              <C>         <C>
Roland D. Boehm........      60            1980      Vice Chairman of the Board of Directors of
                                                     the Company, Mercer Mutual and MIC; Owner of
                                                     Boehm Appraisal; Director of Prestige
                                                     Financial Corp.
James J. Freda.........      77            1985      Director of the Company, Mercer Mutual and
                                                     MIC; Owner of James J. Freda, Inc.
William C. Hart........      65            1970      President, Chief Executive Officer and
                                                     Director of the Company, Mercer Mutual and
                                                     MIC
George T. Hornyak, Jr..      48            1985      Director of the Company, Mercer Mutual and
                                                     MIC; since December 18, 1998, Director of
                                                     and consultant for First Sentinel Bancorp,
                                                     Inc.; From 1991 to December 18, 1998,
                                                     President, Chief Executive Officer and
                                                     Director of Pulse Bancorp, Inc. and Pulse
                                                     Savings Bank
Richard U. Niedt.......      67            1979      Director of the Company, Mercer Mutual and
                                                     MIC; Retired
Andrew R. Speaker......      35            1997      Executive Vice President, Chief Operating
                                                     Officer, Chief Financial Officer, Treasurer
                                                     and Director of the Company, Mercer Mutual
                                                     and MIC
Richard G. Van Noy.....      57            1979      Chairman of the Board of Directors of the
                                                     Company and Mercer Mutual and MIC; Hopewell
                                                     Township Administrator
</TABLE>
 
- ---------------
 
(1) Indicates year first elected as a director of Mercer Mutual. All members of
    the Board of Directors of the Company have served as directors of the
    Company since its incorporation.
 
     Following the Conversion, directors of Mercer Mutual will be paid a monthly
retainer of $950 and a monthly meeting fee of $700 and directors of MIC will be
paid a monthly retainer of $350. Directors may elect to defer payment of such
fees until a later date pursuant to the terms of Mercer Mutual's Corporate
Director Deferred Compensation Plan. Mercer Mutual pays interest on such
deferred amounts at a floating market rate. No director of the Company has
received any remuneration from the Company since its formation and the Company
does not presently intend to pay any fees for service as a director of the
Company. Directors of Mercer Mutual elected after October 1, 1997 who receive a
salary from Mercer Mutual or its affiliates are not entitled to receive an
annual retainer or other additional compensation from Mercer Mutual for services
rendered as directors or committee members.
 
     Since 1990, Mercer Mutual has maintained a Benefit Agreement pursuant to
which it provides a pension to all directors upon their retirement from the
Board. The pension is in the form of a monthly payment equal
 
                                       71
<PAGE>   72
 
to the director's monthly retainer fee in effect on such director's retirement
date. If a participating director dies prior to receiving 120 monthly payments
under this plan, his beneficiaries are entitled to receive such payments until
the total number of payments received by the director and his beneficiaries
equals 120.
 
  Certain Transactions
 
     Since 1994, Mercer Mutual has been a party to a consulting agreement (the
"Consulting Agreement") with director Roland D. Boehm. The Consulting Agreement
provides that Mr. Boehm is required to provide certain advisory services to
Mercer Mutual for annual compensation of $31,200. The Consulting Agreement has a
term of one year and is renewable at the option of the Board of Directors. The
current term expires on April 1, 1999 and management expects that the Board of
Directors will renew the one-year term at that time.
 
EXECUTIVE OFFICERS
 
     The executive officers of the Company are elected annually and hold office
until their respective successors have been elected and qualified or until
death, resignation or removal by the Board of Directors of the Company.
 
     The following table sets forth certain information regarding the executive
officers of the Company.
 
<TABLE>
<CAPTION>
                            AGE AT        EXECUTIVE
                         SEPTEMBER 30,     OFFICER                                      BUSINESS EXPERIENCE
         NAME                1998         SINCE(1)              TITLE                 FOR THE LAST FIVE YEARS
         ----            -------------    ---------             -----                 -----------------------
<S>                      <C>              <C>          <C>                         <C>
William C. Hart........       65            1986       President and Chief         President, Chief Executive
                                                       Executive Officer             Officer, and Director of
                                                                                     Mercer Mutual and MIC
Andrew R. Speaker......       35            1990       Executive Vice              Executive Vice President and
                                                       President, Chief              Chief Operating Officer of
                                                       Operating Officer, Chief      Mercer Mutual and MIC since
                                                       Financial Officer and         October 1, 1997; Senior
                                                       Treasurer                     Vice President of Mercer
                                                                                     Mutual and MIC from April
                                                                                     1994 to October 1, 1997;
                                                                                     Chief Financial Officer and
                                                                                     Treasurer of Mercer Mutual
                                                                                     and MIC since 1990
Marion J. Crum.........       55            1984       Vice President and          Vice President and Secretary
                                                       Secretary                   of Mercer Mutual and MIC
John G. Danka..........       50            1995       Vice President and          Vice President of Mercer
                                                       Marketing Director            Mutual and MIC since 1995;
                                                                                     Marketing Director of
                                                                                     Mercer Mutual and MIC since
                                                                                     1994; Senior Manager,
                                                                                     American Reliance Companies
                                                                                     from 1988 to 1994
Paul D. Ehrhardt.......       40            1996       Vice President              Vice President of Mercer
                                                                                     Mutual and MIC since 1996;
                                                                                     Regional Vice President,
                                                                                     VIK Brothers Insurance
                                                                                     Group from 1995 to 1996;
                                                                                     Branch Manager, American
                                                                                     Reliance Companies from
                                                                                     1991 to 1995
</TABLE>
 
- ---------------
(1) Indicates year first appointed as an executive officer of Mercer Mutual.
    Each executive officer of the Company was first appointed on November 12,
    1997.
 
EXECUTIVE COMPENSATION
 
     The executive officers of the Company have received no compensation from
the Company since its formation. The following table sets forth information
regarding the compensation of the President and Chief Executive Officer, the
Executive Vice President, Chief Operating Officer, Chief Financial Officer and
Treasurer, and a Vice President of the Company, for each of the fiscal years
ended December 31, 1996, 1997
                                       72
<PAGE>   73
 
and 1998. All compensation paid in 1996, 1997 and 1998 to such executive
officers was paid by Mercer Mutual. No other executive officer of the Company
received compensation in excess of $100,000 for the fiscal year ended December
31, 1998.
 
<TABLE>
<CAPTION>
                                                           SALARY                   ALL OTHER
NAME AND PRINCIPAL POSITION                       YEAR     (1)(2)      BONUS     COMPENSATION(4)
- ---------------------------                       ----    --------    -------    ---------------
<S>                                               <C>     <C>         <C>        <C>
William C. Hart.................................  1998    $163,076    $ --(3)        $6,392
  President and Chief Executive Officer           1997     144,905     30,000         5,925
                                                  1996     135,776      9,102         5,919
Andrew R. Speaker...............................  1998     127,404      --(3)         4,568
  Executive Vice President,                       1997     108,421     25,000         4,110
  Chief Operating Officer,                        1996      97,964      7,079         3,768
  Chief Financial Officer and Treasurer
Paul D. Ehrhardt................................  1998      95,384      --(3)         3,731
  Vice President                                  1997      84,616     19,000         2,003
                                                  1996(5)   50,769      4,045             0
</TABLE>
 
- ---------------
(1) Includes amounts which were deferred pursuant to Mercer Mutual's 401(k)
    plan. Under the 401(k) plan, employees who elect to participate may elect to
    have earnings reduced and to cause the amount of such reduction to be
    contributed to the 401(k) plan's related trust in an amount up to 15% of
    earnings. Any employee who has completed one year of service and has worked
    1,000 hours in a plan year is eligible to participate in the 401(k) plan.
 
(2) Mercer Mutual provided other benefits to the executive officers in
    connection with their employment. The value of such personal benefits, which
    is not directly related to job performance, is not included in the table
    above because the value of such benefits does not exceed the lesser of
    $50,000 or 10% of the salary and bonus paid to any executive officer.
 
(3) Bonuses for the year ended December 31, 1998 will not be determined until
    February 1999. These determinations will be first calculated for the officer
    group as a whole, based on the net income, combined ratio and underwriting
    profitability of the Insurance Companies. The Compensation Committee of the
    Board of Directors will then allocate to each individual officer his or her
    share of the total bonus amount, based on job performance.
 
(4) Includes amounts contributed under the 401(k) plan for the benefit of the
    executive officer. Mercer Mutual contributes 2% of an employee's salary. In
    addition, Mercer Mutual will make a matching contribution equal to 66.7% of
    the employee's salary reduction up to a maximum of 2% of the employee's
    salary.
 
(5) Mr. Ehrhardt commenced his employment with Mercer Mutual in 1996.
 
CERTAIN BENEFIT PLANS AND AGREEMENTS
 
     In connection with the Conversion, the Company's Board of Directors has
approved the ESOP and certain employment agreements with the executive officers
of the Company. After completion of the Conversion, the Company's Board of
Directors intends to adopt the Compensation Plan and the MRP, subject to
shareholder approval. In addition, Mercer Mutual has an existing 401(k) plan and
profit sharing plan in which the executive officers of the Company will be
eligible to participate after the Conversion.
 
  Stock Compensation Plan.
 
     After completion of the Conversion, the Company's Board of Directors
intends to adopt the Compensation Plan, subject to receipt of shareholder
approval at the Company's first annual meeting of shareholders after the
Conversion.
 
     The purpose of the Compensation Plan will be to provide additional
incentive to directors and employees of the Company and Mercer Mutual by
facilitating their purchase of stock in the Company. It is anticipated that the
Compensation Plan will have a term of ten years from the date of its approval by
the Company's shareholders (unless the plan is earlier terminated by the Board
of Directors of the Company), after which ten
 
                                       73
<PAGE>   74
 
year period no awards may be made. Pursuant to the Compensation Plan, a number
of shares equal to 10% of the shares of Common Stock that are issued in the
Conversion will be reserved for future issuance by the Company, in the form of
newly-issued or treasury shares, upon exercise of stock options ("Options") or
stock appreciation rights ("SARs"), or the grant of restricted stock
("Restricted Stock"). Options, SARs, and Restricted Stock are collectively
referred to herein as "Awards."
 
     It is intended that Options granted under the Compensation Plan will
constitute either incentive stock options (options that afford favorable tax
treatment to recipients upon compliance with certain restrictions pursuant to
Section 422 of the Internal Revenue Code of 1986, as amended (the "Code"), and
that do not result in tax deductions to the Company unless participants fail to
comply with Section 422 of the Code) ("ISOs")) or options that do not so qualify
("Non-ISOs"). Management expects that the exercise price for Options will be
determined as of the date the Option is granted based on the then market price
of the Common Stock and other factors.
 
     A SAR may be granted in tandem with all or any part of any Option or
without any relationship to any Option. Whether or not a SAR is granted in
tandem with an Option, exercise of the SAR will entitle the optionee to receive
all or a percentage of the excess of the then fair market value of the shares of
Common Stock subject to the SAR at the time of its exercise, over the aggregate
exercise price of the shares subject to the SAR.
 
     Restricted Stock is Common Stock which is nontransferable and forfeitable
until a grantee's interest therein vests. Nevertheless, the grantee typically is
entitled to vote the Restricted Stock and to receive dividends and other
distributions made with respect to the Restricted Stock.
 
     The terms and conditions of the Compensation Plan are currently under
consideration by the Company's Board of Directors. The initial grant of Options
under the Compensation Plan is expected to take place on the date of the receipt
of shareholder approval of the Compensation Plan. No decisions concerning the
number of options to be granted to any director or officer have been made at
this time. No Awards will be made prior to the receipt of shareholder approval
of the Compensation Plan.
 
  Employee Stock Ownership Plan.
 
     In connection with the Conversion, the Company's Board of Directors has
adopted the Company's Employee Stock Ownership Plan (the "ESOP") for the
exclusive benefit of participating employees, to be implemented upon the
completion of the Conversion. Participating employees are all employees of the
Company and its subsidiaries who have attained age 21 and completed one year of
service with the Company or its subsidiaries. The Company will submit to the IRS
an application for a letter of determination as to the tax-qualified status of
the ESOP. Although no assurances can be given, the Company expects that the ESOP
will receive a favorable letter of determination from the IRS.
 
     The ESOP intends to borrow funds from the Company pursuant to the ESOP Loan
in an amount sufficient to purchase 10% of the Common Stock issued in the
Conversion. The ESOP Loan will bear an interest rate equal to the prime rate of
interest set forth in The Wall Street Journal on the closing date of the
Conversion. At the Total Midpoint, the ESOP Loan will require the ESOP to make
monthly principal payments of $24,583, plus interest, for a term of 10 years.
The loan will be secured by the shares of Common Stock purchased and earnings
thereon. Shares purchased with the ESOP Loan proceeds will be held in a suspense
account for allocation among participants as the ESOP Loan is repaid. Mercer
Mutual expects to contribute sufficient funds to the ESOP to repay the ESOP
Loan.
 
     Contributions to the ESOP and shares released from the suspense account
will be allocated among participants on the basis of their annual wages subject
to federal income tax withholding, plus any amounts withheld under a plan
qualified under Sections 125 or 401(k) of the Code and sponsored by the Company
or an affiliate of the Company. Participants must be employed at least 500 hours
in a calendar year in order to receive an allocation. A participant becomes 100%
vested in his or her right to ESOP benefits only after completing 5 years of
service. For vesting purposes, a year of service means any year in which an
employee completes at least 1,000 hours of service. Vesting will be accelerated
to 100% upon a participant's attainment
 
                                       74
<PAGE>   75
 
of age 65, death, or disability. Forfeitures will be reallocated to participants
on the same basis as other contributions. Benefits are payable upon a
participant's retirement, death, disability, or separation from service, and
will be paid in a lump sum or whole shares of Common Stock (with cash paid in
lieu of fractional shares). Dividends paid on allocated shares are expected to
be credited to participant accounts within the ESOP or paid to participants, and
dividends on unallocated shares are expected to be used to repay the ESOP loan.
 
     The Company will administer the ESOP, and an unaffiliated bank or trust
company will be appointed as trustee of the ESOP (the "ESOP Trustee"). The ESOP
Trustee must vote all allocated shares held in the ESOP in accordance with the
instructions of the participants. Unallocated shares and allocated shares for
which no timely direction is received will be voted by the ESOP Trustee in the
same proportion as the participant-directed voting of allocated shares.
 
  Management Recognition Plan.
 
     After completion of the Conversion, the Company's Board of Directors
intends to adopt the MRP subject to receipt of shareholder approval at the
Company's first annual meeting of shareholders after the Conversion. The
objective of the MRP will be to enable the Company to reward and retain key
personnel. Those eligible to receive benefits under the MRP will be directors
and executive officers of the Company and the Insurance Companies.
 
     It is intended that the MRP may grant up to an aggregate number of shares
equal to 4% of the shares of the Common Stock that were issued in the Conversion
(the "MRP Shares"). The Company intends to contribute sufficient funds to the
MRP Trust to enable it to purchase the MRP shares in the open market. However,
if the MRP Trustees are unable to purchase all of the MRP Shares in the open
market at a price which is satisfactory to the MRP Trustees in their discretion,
then all or a portion of the MRP Shares will consist of newly issued shares of
authorized Common Stock issued directly by the Company to the MRP Trust. Subject
to the foregoing, at the Total Minimum, Total Midpoint, Total Maximum, the
Company anticipates that the number of MRP Shares purchased in the open market
would be 100,300 shares, 118,000 shares, and 135,700 shares, respectively, and
assuming that all of the MRP Shares purchased in the open market are purchased
at the Purchase Price, the cost to the Company would be $1,003,000, $1,180,000
and $1,357,000, respectively.
 
     It is anticipated that all of the MRP Shares will be awarded to eligible
directors and executive officers in exchange for service and at no cost to them
pursuant to the terms of the MRP. It is further anticipated that vesting will
occur at the rate of 20% per year of service following the award date.
 
     The terms and conditions of the MRP are currently under consideration by
the Company's Board of Directors. The Company's Board of Directors intends to
seek shareholder approval of the MRP at the first annual meeting of shareholders
following completion of the Conversion. No decisions have been made concerning
the number of MRP awards to be granted to any director or officer. No awards
will be made prior to shareholder approval of the MRP.
 
  Executive Employment Agreements.
 
     As of October 1, 1997, William C. Hart and Andrew R. Speaker, and as of
October 1, 1998, Paul D. Ehrhardt, each entered into Employment Agreements with
the Company and Mercer Mutual (collectively, the "Employment Agreements"). Each
Employment Agreement has an initial three-year term and after the expiration of
each year of the term, provides for a one-year extension, upon review by the
Board of Directors, so as to maintain a three-year term, unless the Company or
the executive gives prior written notice of nonrenewal. Under their respective
Employment Agreements, as currently in effect, Mr. Hart is entitled to receive
an annual base salary of not less than $170,000; Mr. Speaker is entitled to
receive an annual base salary of not less than $135,000; and Mr. Ehrhardt is
entitled to receive a base salary of not less than $110,000. In addition,
Messrs. Hart, Speaker and Ehrhardt are each entitled to participate in any other
incentive compensation and employee benefit plans that the Company maintains.
 
                                       75
<PAGE>   76
 
     In the event the Company terminates the executive's employment for "Cause"
as defined in the Employment Agreements, the executive will be entitled to
receive his accrued but unpaid base salary and an amount for all accumulated but
unused vacation time earned through the date of his termination.
 
     In the event the Company terminates the executive's employment without
Cause, the executive will be entitled to receive an annual amount equal to the
greater of (i) his highest base salary received during one of the two years
immediately preceding the year in which he is terminated, or (ii) his base
salary in effect immediately prior to his termination, for the remainder of the
term of his Employment Agreement. In addition, during the remaining term of his
Employment Agreement, the executive will annually be entitled to (i) an amount
equal to the higher of the aggregate bonuses paid to him in one of the two years
immediately preceding the year in which he is terminated and (ii) an amount
equal to the sum of the highest annual contribution made on his behalf (other
than his own salary reduction contributions) to each of the Company's tax
qualified and non-qualified defined contribution plans (as such term is defined
in Section 3(35) of the Employee Retirement Income Security Act of 1974, as
amended ("ERISA")) in the year in which he is terminated or in one of the two
years immediately preceding such year. The executive will also be entitled to
certain retirement, health and welfare benefits.
 
     In the event the executive terminates his employment with the Company for
"Good Reason," as defined in the Employment Agreements, the executive will be
entitled to receive the same amounts and benefits he would receive if terminated
without Cause. In the event the executive terminates his employment with the
Company without Good Reason, the executive will be entitled to receive his
accrued but unpaid base salary until the date of termination and an amount for
all accumulated but unused vacation time through the date of the determination
of his employment.
 
     In the event of the executive's death or disability during the term of his
employment, the executive and his eligible dependents or his spouse and her
eligible dependents, as the case may be, will be entitled to receive certain
cash amounts and certain health and welfare benefits.
 
     In the event that the executive is required to pay any excise tax imposed
under Section 4999 of the Code (or any similar tax imposed under federal, state
or local law) as a result of any compensation and benefits received under his
Employment Agreement in connection with a change in control, the Company will
pay to the executive an additional amount such that the net amount retained by
him, after the payment of such excise taxes (and any additional income tax
resulting from such payment by the Company), equals the amount he would have
received but for the imposition of such taxes.
 
     The Employment Agreements further provide that in the event the executive's
employment is terminated for Cause or he voluntarily terminates his employment
prior to a "Change in Control," as defined in the Employment Agreements, the
executive may not, for a period of twelve months after the date of termination,
without the prior written consent of the Company's Board of Directors, become an
officer, director or a shareholder or equity owner of 4.9% or more of any
property and casualty insurance company with its corporate headquarters located
within New Jersey. In addition, during the executive's employment and for a
period of 12 months following the termination of his employment, except
following a Change in Control, the executive may not solicit, endeavor to entice
away from the Company, its subsidiaries or affiliates, or otherwise interfere
with the relationship of the Company or its subsidiaries or affiliates with any
person who is, or was within the then most recent 12-month period, an employee
or associate of the Company or any of its subsidiaries or affiliates.
 
                                       76
<PAGE>   77
 
                                 THE CONVERSION
 
     THE PLAN HAS BEEN APPROVED BY THE PENNSYLVANIA DEPARTMENT, SUBJECT TO THE
PLAN'S APPROVAL BY THE POLICYHOLDERS OF MERCER MUTUAL ENTITLED TO VOTE AND THE
SATISFACTION OF CERTAIN OTHER CONDITIONS IMPOSED BY THE PENNSYLVANIA DEPARTMENT
IN ITS APPROVAL. APPROVAL BY THE PENNSYLVANIA DEPARTMENT DOES NOT CONSTITUTE A
RECOMMENDATION OR ENDORSEMENT OF THE PLAN.
 
BACKGROUND AND REASONS FOR THE CONVERSION
 
     Mercer Mutual's exposure to severe winter weather conditions has been a
major factor affecting its underwriting results since 1991. Operating results in
1994 and 1996 were adversely affected by losses from severe winter storms in
such years that were largely responsible for Mercer Mutual's $1.4 million net
operating loss in 1994 and that reduced net income by $665,000 in 1996. In order
to reduce the risk caused by this exposure, Mercer Mutual's strategic plan is
expressly predicated upon geographically diversifying its business and improving
capital strength. Mercer Mutual's Board of Directors believes that the
geographic diversification that could be achieved under Mercer Mutual's current
organizational structure as a mutual insurance company, by engaging in
relationships with independent agencies in other geographic areas, through
acquisitions or otherwise, would be a lengthy process, and would be limited to
the extent of Mercer Mutual's capital and personnel resources, as well as by its
inability to issue stock to finance acquisitions. The Board of Directors of
Mercer Mutual has determined that the fastest and most effective method to
achieve its goals is through a conversion to a stock company and a simultaneous
and substantial infusion of capital. The ability to issue stock and the
additional capital would immediately allow Mercer Mutual to seek and finance the
acquisition of companies with significant business in other geographic areas,
and would provide additional policyholder protection.
 
     Since 1996, Mercer Mutual has considered various capital formation
alternatives and has elected to proceed with the Conversion in accordance with
the provisions of the Pennsylvania Insurance Company Mutual to Stock Conversion
Act (the "Act"). The Act was passed by the Pennsylvania General Assembly in
December 1995. On August 12, 1997, management was directed by the Board of
Directors of Mercer Mutual to explore the process and feasibility of Conversion
under the Act. On September 11, 1997, the Board of Directors authorized further
study and requested a presentation with respect to the process at its meeting on
September 26, 1997. At such meeting, management was directed to prepare the Plan
for consideration at the next regularly scheduled meeting of the Board of
Directors. On October 17, 1997, the Board of Directors of Mercer Mutual
unanimously adopted the Plan, subject to approval by the Pennsylvania Department
and the policyholders of Mercer Mutual. The Board of Directors unanimously
adopted amendments to the Plan on November 12, 1997 and on April 15 and May 13,
1998. An application with respect to the Conversion was filed by Mercer Mutual
with the Pennsylvania Department on November 26, 1997 and notice of the filing
and the opportunity to comment on and to request and receive a copy of the Plan
was mailed on December 2, 1997 to all Eligible Policyholders, as required by
law. In May 1998, Franklin Mutual Insurance Company ("Franklin") filed with the
Pennsylvania Department a petition to intervene and request for a full
adjudicatory hearing with respect to all proceedings of the Pennsylvania
Department concerning Mercer Mutual's application for approval of the Plan. The
Pennsylvania Department held an informational public hearing regarding the
Conversion on June 5, 1998. By orders dated October 20, 1998 (the "Orders"), the
Plan was approved by the Pennsylvania Department and the Company received the
approval of the Pennsylvania Department to acquire control of Mercer Mutual. The
Orders also conclude that, among other things, in its review of the Plan, the
Pennsylvania Department considered Franklin's petition to intervene and request
for adjudicatory hearing as public comments, and not as formal pleadings because
formal pleadings are not required or appropriate in the review of a proposed
plan of conversion under the Act. Therefore, no further action was required to
be taken by the Pennsylvania Department in response to Franklin's petition and
request. On October 27, 1998, Franklin filed with the Pennsylvania Department an
appeal of the Orders and a request for a full adjudicatory hearing. On November
6, 1998, the Pennsylvania Department rejected Franklin's appeal because the
Pennsylvania Department had no jurisdiction to entertain such appeal. On
November 9, 1998, Franklin filed a petition for review in the nature of an
appeal with the Pennsylvania Commonwealth Court objecting to and requesting that
the Court reverse the Orders (the "Franklin Action"). Mercer Mutual
 
                                       77
<PAGE>   78
 
has filed with the Commonwealth Court a notice to intervene in the Franklin
Action. The Franklin Action is still pending. See "Risk Factors -- Possible
Adverse Impact of Litigation" and "-- Requirement for Policyholder Approval,"
and "Business -- Offer to Acquire Mercer Mutual" and "-- Legal Proceedings." The
Plan is subject to the approval of the Eligible Policyholders at the Special
Meeting.
 
GENERAL
 
     The Conversion will be accomplished through the filing with the Department
of State of the Commonwealth of Pennsylvania of amended and restated Articles of
Incorporation of Mercer Mutual to authorize the issuance of shares of the
capital stock of Mercer Mutual and to conform to the requirements of a
Pennsylvania stock insurance company. The Company has received the approval of
the Pennsylvania Department to contribute $5.0 million of the net proceeds of
the Offering to Mercer Mutual in exchange for all of the capital stock of Mercer
Mutual to be issued in the Conversion. See "Use of Proceeds." Upon issuance of
the shares of capital stock of Mercer Mutual to the Company, Mercer Mutual will
become a wholly-owned subsidiary of the Company. The Conversion will be effected
only upon completion of the sale of at least the minimum number of shares of
Common Stock required to be sold by the Company pursuant to the Plan. The
Conversion will be accounted for as a simultaneous reorganization,
recapitalization and share offering which will not change the historical
accounting basis of Mercer Mutual's financial statements.
 
     The aggregate purchase price of the Common Stock to be issued in the
Conversion will be within the Estimated Valuation Range of between $25,075,000
and $33,925,000, based upon an independent Appraisal of the estimated
consolidated pro forma market value of the Common Stock prepared by Sheshunoff.
All shares of Common Stock to be issued and sold in the Conversion will be sold
at the same price of $10.00 per share. The independent Appraisal will be
affirmed or, if necessary, updated upon the completion of the Conversion
Offerings if all shares are subscribed for or at the completion of any
Syndicated Community Offering. Sheshunoff is a consulting firm experienced in
corporate valuations. For additional information, see "Stock Pricing and Number
of Shares to be Issued" herein.
 
     The following is a summary of certain aspects of the Conversion. The
summary is qualified in its entirety by reference to the provisions of the Plan,
a copy of which is available for inspection at the Company's principal executive
offices located at 10 North Highway 31, Pennington, New Jersey. A copy of the
Plan was also sent by Mercer Mutual to each Eligible Policyholder together with
the notice of the Special Meeting. The Plan is also filed as an exhibit to the
Registration Statement of which this Prospectus is a part, copies of which may
be obtained from the SEC. See "Available Information."
 
OFFERING OF COMMON STOCK
 
     Under the Plan, the Company is offering shares of Common Stock in the
Subscription Offering first to the Eligible Policyholders, second to the ESOP,
and third to the directors, officers and employees of Mercer Mutual.
Subscription rights received in the third category will be subordinated to the
subscription rights of the Eligible Policyholders. The Company is also
concurrently offering Common Stock to the general public in the Community
Offering. See "The Conversion Offerings." It is anticipated that all shares not
subscribed for in the Conversion Offerings will be offered for sale by the
Company to the general public in the Syndicated Community Offering. See
"Syndicated Community Offering."
 
     The completion of the Offerings is subject to market conditions and other
factors beyond the Company's control. In the event that the Conversion is not
completed, Mercer Mutual will remain a mutual insurance company and all
subscription funds will be promptly returned to subscribers without interest. In
addition, Mercer Mutual would be required to charge all Conversion expenses
against current income. As of September 30, 1998, such charge would equal
$916,000, and would have a material adverse effect on Mercer Mutual's financial
condition and results of operations.
 
BUSINESS PURPOSES
 
     The Company was formed to serve as the holding company for all of the
issued and outstanding capital stock of Mercer Mutual upon completion of the
Conversion. The portion of the net proceeds from the sale of
                                       78
<PAGE>   79
 
Common Stock in the Conversion that the Company will contribute to Mercer Mutual
will substantially increase Mercer Mutual's surplus which will, in turn, enhance
policyholder protection and increase the amount of funds available to support
both current operations and future growth and thereby provide increased
opportunities for existing employees while creating new jobs. The holding
company structure also will provide greater flexibility for diversification of
business activities and geographic operations. Management believes that this
increased capital and operating flexibility will enable the Company and Mercer
Mutual to compete more effectively with other insurance companies. In addition,
the Conversion will enhance the future access of the Company and Mercer Mutual
to the capital markets.
 
     After completion of the Conversion, the unissued Common Stock and preferred
stock authorized by the Company's Articles of Incorporation will permit the
Company to raise additional equity capital through further sales of securities
and to issue securities in connection with possible acquisitions. At the present
time, the Company has no plans with respect to additional offerings of
securities following the Conversion, other than the possible issuance of
additional shares under the MRP and Compensation Plan, if implemented. Following
completion of Conversion, the Company also will be able to use stock-related
incentive programs to attract, motivate and retain highly qualified employees
for itself and its subsidiaries. See "Management of the Company -- Certain
Benefit Plans and Agreements."
 
EFFECT OF CONVERSION ON POLICYHOLDERS
 
  General.
 
     Each policyholder in a mutual insurance company, including each
policyholder of Mercer Mutual, has certain interests in its policy issuing
insurance company in addition to the contractual right to insurance coverage
afforded by the policyholder's policy of insurance. These interests are (i) the
right to vote with respect to the election of directors of the company and
certain other fundamental corporate transactions, such as an amendment to the
articles of incorporation of the company or a merger of the company, and (ii)
the right to receive dividends if, as and when declared by the board of
directors of the company (Mercer Mutual has never declared a policyholder
dividend and currently does not anticipate doing so in the future). In addition,
Pennsylvania law is unclear as to the consequences in the unlikely event of a
solvent dissolution of the company. One provision of Pennsylvania law with
respect to nonstock corporations (such as Mercer Mutual) states that in the
absence of any controlling provisions of the articles, bylaws or other documents
evidencing membership in a nonstock corporation, upon a solvent dissolution,
members have the right to receive a pro rata distribution of any surplus
remaining after the satisfaction of all claims and other liabilities of the
company. A more recently enacted provision of Pennsylvania law that is
specifically applicable to mutual insurance companies states that any surplus of
a mutual insurance company remaining after satisfaction of all claims and
liabilities escheats to the Commonwealth of Pennsylvania. In the view of the
Pennsylvania Department, the more recent statute specifically applicable to
mutual insurance companies which provides for escheat is controlling.
 
     In any event, all interests in a mutual insurance company are incident to,
and contingent upon the existence of, the underlying insurance policy. These
interests have no tangible market value separate from such insurance policy, and
a policyholder who terminates his policy automatically forfeits the interests in
the company described above. Upon the completion of the Conversion, policyholder
interests in Mercer Mutual, other than contract rights under policies of
insurance, will be terminated as a result of the Conversion.
 
     If the Plan is not approved by the Eligible Policyholders or if the
Conversion fails to be completed for any other reason, Mercer Mutual will
continue its existence as a mutual insurance company and Eligible Policyholders
will retain the rights described above.
 
  Continuity of Insurance Coverage and Business Operations.
 
     The Conversion will not affect the contractual rights of policyholders to
insurance protection under their individual insurance policies with Mercer
Mutual. During and after the Conversion, the normal business of Mercer Mutual of
issuing insurance policies in exchange for premium payments and processing and
paying
 
                                       79
<PAGE>   80
 
claims will continue without change or interruption. After the Conversion,
Mercer Mutual will continue to provide services for policyholders under current
policies and by its present management and staff.
 
     The Board of Directors of Mercer Mutual at the time of the Conversion will
continue to serve as the Board of Directors of Mercer Mutual after the
Conversion. The Board of Directors of the Company will consist of the following
persons, each of whom is an existing director of Mercer Mutual: Roland D. Boehm,
James J. Freda, William C. Hart, George T. Hornyak, Richard U. Niedt, Andrew R.
Speaker and Richard G. Van Noy. See "Management of the Company -- Directors."
All officers of Mercer Mutual at the time of the Conversion will retain their
positions with Mercer Mutual after the Conversion.
 
  Voting Rights.
 
     Upon completion of the Conversion, the voting rights of all policyholders
in Mercer Mutual will terminate and policyholders will no longer have the right
to elect the directors of Mercer Mutual or approve transactions involving Mercer
Mutual. Instead, voting rights in Mercer Mutual will be vested exclusively in
the Company, which will own all the capital stock of Mercer Mutual. Voting
rights in the Company will be vested exclusively in the shareholders of the
Company, including Eligible Policyholders who purchase shares of Common Stock in
the Subscription Offering. Each holder of Common Stock shall be entitled to vote
on any matter to be considered by the shareholders of the Company, subject to
the terms of the Company's Articles of Incorporation, Bylaws and to the
provisions of Pennsylvania and federal law. See "Description of Capital
Stock -- Common Stock."
 
  Policyholder Dividends.
 
     The Conversion will not affect the right of a policyholder to receive
dividends from Mercer Mutual in accordance with the terms of the policyholder's
existing policy of insurance, which provides that dividends will be paid only
if, as and when declared by the Board of Directors of Mercer Mutual. However,
Mercer Mutual has never declared a policyholder dividend and presently does not
anticipate doing so in the future, whether or not Mercer Mutual converts to
stock form. With respect to the Company, its shareholders, including Eligible
Policyholders who purchase shares of Common Stock in the Subscription Offering,
will have the exclusive right to receive dividends paid by the Company, if any.
See "Description of Capital Stock -- Common Stock."
 
  Rights Upon Dissolution.
 
     While it may be unclear what right policyholders would have if there were a
solvent dissolution of Mercer Mutual, it is clear that after the Conversion,
policyholders will no longer have the right to receive a pro rata distribution
of any remaining surplus of Mercer Mutual. Instead, this right will vest in the
Company as the sole shareholder of Mercer Mutual. In the event of a liquidation,
dissolution or winding up of the Company, shareholders of the Company, including
Eligible Policyholders who purchase shares of Common Stock in the Subscription
Offering, would be entitled to receive, after payment of all debts and
liabilities of the Company, a pro rata portion of all assets of the Company. See
"Description of Capital Stock -- Common Stock."
 
THE CONVERSION OFFERINGS
 
  Subscription Offering.
 
     Nontransferable subscription rights to purchase shares of Common Stock are
being issued to all persons entitled to purchase stock in the Subscription
Offering at no cost to such persons. The amount of Common Stock that these
parties may purchase will be determined, in part, by the total number of shares
of Common Stock to be issued and the availability of Common Stock for purchase
under the categories set forth in the Plan.
 
                                       80
<PAGE>   81
 
     Preference categories have been established for the allocation of Common
Stock to the extent that shares are available. These categories are as follows:
 
     Subscription Category No. 1 is reserved for Eligible Policyholders of
Mercer Mutual (those persons who are named insureds at the close of business on
October 17, 1997 (the "Eligibility Record Date") under an existing insurance
policy issued by Mercer Mutual). Each Eligible Policyholder will receive,
without payment, subscription rights to purchase up to 100,000 shares of Common
Stock at the Purchase Price; provided, however, that the maximum number of
shares that may be purchased by Eligible Policyholders in the aggregate is
3,392,500 shares. In the event of an oversubscription, shares of Common Stock
will be allocated among subscribing Eligible Policyholders, as follows. First,
shares of Common Stock will be allocated among subscribing Eligible
Policyholders so as to permit each such Eligible Policyholder, to the extent
possible, to purchase the lesser of (i) 1,000 shares, or (ii) the number of
shares for which such Eligible Policyholder has subscribed. Second, any shares
of Common Stock remaining after such initial allocation will be allocated among
the subscribing Eligible Policyholders whose subscriptions remain unsatisfied in
the proportion in which the aggregate number of shares as to which each such
Eligible Policyholder's subscription remains unsatisfied bears to the aggregate
number of shares as to which all Eligible Policyholders' subscriptions remain
unsatisfied; provided, however, that no fractional shares of Common Stock shall
be issued. If, because of the magnitude of the oversubscription, shares of
Common Stock cannot be allocated among subscribing Eligible Policyholders so as
to permit each such Eligible Policyholder to purchase the lesser of 1,000 shares
or the number of shares subscribed for, then shares of Common Stock will be
allocated among the subscribing Eligible Policyholders in the proportion in
which: (i) the aggregate number of shares subscribed for by each such Eligible
Policyholder bears to (ii) the aggregate number of shares subscribed for by all
Eligible Policyholders; provided, however, that no fractional shares of
Conversion Stock shall be issued.
 
     The following table sets forth the maximum number of shares that an
Eligible Policyholder could purchase if a certain number of Eligible
Policyholders each subscribed for the maximum number of shares:
 
<TABLE>
<CAPTION>
      NUMBER OF              PERCENTAGE OF         MAXIMUM NUMBER
ELIGIBLE POLICYHOLDERS   ELIGIBLE POLICYHOLDERS       OF SHARES
   SUBSCRIBING FOR          SUBSCRIBING FOR        EACH SUBSCRIBER
  100,000 SHARES(1)          100,000 SHARES       COULD PURCHASE(1)
- ----------------------   ----------------------   -----------------
<S>                      <C>                      <C>
        42,178                    100%                    80
        31,634                     75%                   107
        21,089                     50%                   160
        10,545                     25%                   321
</TABLE>
 
- ---------------
(1) Assumes that all subscribing Eligible Policyholders subscribe for 100,000
    shares. If any other Eligible Policyholders subscribes for less than 100,000
    shares, the maximum number of shares that a subscriber for 100,000 shares
    could purchase could be less than the amount reflected in the table.
 
     Subscription Category No. 2 is reserved for the ESOP, which shall receive,
without payment, nontransferable subscription rights to purchase at the Purchase
Price, in the aggregate, up to 10% of the total shares of Common Stock to be
issued in the Offerings. The ESOP is expected to purchase 10% of the total
shares of Common Stock issued in the Offerings. See "Management of the
Company -- Certain Benefit Plans and Agreements -- Employee Stock Ownership
Plan."
 
     Subscription Category No. 3 is reserved for directors, officers and
employees of Mercer Mutual. Each director, officer and employee of Mercer Mutual
will receive, without payment, subscription rights to purchase up to 100,000
shares of Common Stock at the Purchase Price; provided, however, that such
subscription rights will be subordinated to the subscription rights received by
the Eligible Policyholders and may be exercised only to the extent that there
are shares of Common Stock that could have been purchased by Eligible
Policyholders, but which remain unsold after satisfying the subscriptions of all
Eligible Policyholders. In the event of an oversubscription among the directors,
officers and employees, shares of Common Stock shall be allocated among them on
the basis of a point system under which each director, officer and employee will
be assigned one point for each year of service to Mercer Mutual, one point for
each then current annual salary
 
                                       81
<PAGE>   82
 
increment of $5,000, and one point for each office held in Mercer Mutual. Each
subscribing director, officer or employee will then receive that number of
shares of Common Stock equal to the remaining unallocated shares of Common Stock
multiplied by a fraction the numerator of which is the number of points held by
such director, officer or employee and the denominator of which is the total
number of points held by all subscribing directors, officers and employees. A
director, officer or employee of Mercer Mutual who subscribes to purchase shares
of Common Stock and who is also eligible to purchase shares of Common Stock as
an Eligible Policyholder will be deemed to purchase Common Stock first in his or
her capacity as an Eligible Policyholder. The total number of shares that each
director, officer or employee will be able to purchase both in his or her
capacities as an Eligible Policyholder and a director, officer or employee, will
equal 100,000 shares in the aggregate. Each of the Company's directors and
executive officers is also an Eligible Policyholder and will purchase all of his
or her shares in his or her capacity as an Eligible Policyholder and not under
Subscription Category No. 3.
 
     The Company will make reasonable efforts to comply with the securities laws
of all states in the United States in which persons entitled to subscribe for
Common Stock pursuant to the Plan reside. However, no person will be offered or
allowed to purchase any Common Stock under the Plan if he or she resides in a
foreign country or in a state of the United States with respect to which any or
all of the following apply: (i) a small number of persons otherwise eligible to
subscribe for shares under the Plan reside in such state or foreign country;
(ii) the granting of subscription rights or the offer or sale of shares of
Common Stock to such persons would require the Company or Mercer Mutual or their
employees to register, under the securities laws of such state, as a broker,
dealer, salesman or agent or to register or otherwise qualify its securities for
sale in such state or foreign country; or (iii) such registration or
qualification would be impracticable for reasons of cost or otherwise. No
payments will be made in lieu of the granting of subscription rights to any such
person.
 
  Community Offering.
 
     Concurrently with the Subscription Offering, the Company is offering shares
of the Common Stock to the general public in a Community Offering. Preference in
the Community Offering will be given to (i) natural persons and trusts of
natural persons (including individual retirement and Keogh retirement accounts
and personal trusts in which such natural persons have substantial interests)
who are permanent residents in the Local Community of the State of New Jersey or
the Commonwealth of Pennsylvania, (ii) principals of Eligible Policyholders in
the case of an Eligible Policyholder that is a corporation, partnership, limited
liability company or other entity, (iii) licensed insurance agencies who have
been appointed by Mercer Mutual to market and distribute insurance products, and
their owners, (iv) named insureds under policies of insurance issued by Mercer
Mutual after October 17, 1997, and (v) providers of goods or services to, and
identified by, Mercer Mutual. The term "resident," as used in relation to the
preference afforded natural persons in the Local Community, means any natural
person who occupies a dwelling within the Local Community, has an intention to
remain within the Local Community for a period of time (manifested by
establishing a physical, ongoing, non-transitory presence within one of the
states in the Local Community) and continues to reside in the Local Community at
the time of the Community Offering. The Company may utilize policyholder records
or such other evidence provided to it to make the determination whether a person
is a resident of the Local Community. In the case of a corporation or other
business entity, such entity shall be deemed to be a resident of the Local
Community only if its principal place of business or headquarters is located
within the Local Community. All determinations as to the status of a person as a
resident of the Local Community shall be made by Mercer Mutual in its sole and
absolute discretion.
 
     Subscriptions for Common Stock received from members of the general public
in the Community Offering will be subject to the availability of shares of
Common Stock after satisfaction of all subscriptions in the Subscription
Offering, as well as the maximum and minimum purchase limitations set forth in
the Plan. If 2,507,500 or more shares of the Common Stock are subscribed for in
the Subscription Offering, the Company, in its sole discretion, will determine
whether to accept subscriptions for shares in the Community Offering. If
3,392,500 or more shares of the Common Stock are subscribed for in the
Subscription Offering, no shares will be sold in the Community Offering.
FURTHERMORE, THE RIGHT OF ANY PERSON TO PURCHASE SHARES IN THE
 
                                       82
<PAGE>   83
 
COMMUNITY OFFERING, INCLUDING THE PREFERRED SUBSCRIBERS DESCRIBED IN CLAUSES
(i)-(v) ABOVE, IS SUBJECT TO THE ABSOLUTE RIGHT OF THE COMPANY TO ACCEPT OR
REJECT SUCH PURCHASES IN WHOLE OR IN PART.
 
STOCK PRICING AND NUMBER OF SHARES TO BE ISSUED
 
     The Plan requires that the purchase price of the Common Stock be based on
the appraised pro forma market value of Mercer Mutual following the Conversion,
on a consolidated basis, as a subsidiary of the Company, as determined on the
basis of an independent valuation by an appraiser who is experienced in
corporate valuation. The Company has retained Sheshunoff to prepare the
appraisal, and Sheshunoff, as part of its investment banking business, is
engaged regularly in the valuation of assets, securities and companies in
connection with various types of asset and security transactions, including
mergers, acquisitions, private placements, and valuations for various other
purposes and in the determination of adequate consideration in such
transactions. Sheshunoff will receive a fee of approximately $75,000 for its
appraisal.
 
     Sheshunoff has determined that, as of December 28, 1998, the estimated
consolidated pro forma market value of Mercer Mutual as a subsidiary of the
Company was between $25.1 million and $33.9 million. Under the Plan, the
aggregate purchase price of the common Stock to be offered in the Conversion
must equal the pro forma market value of Mercer Mutual following the Conversion,
on a consolidated basis, as a subsidiary of the Company. Under the Act, the
Company is permitted to require a minimum subscription of 25 shares of Common
Stock provided that any required minimum subscription amount established cannot
exceed $500. Based on these minimum subscription parameters, the maximum price
at which the Company could offer shares of Common Stock in the Conversion is $20
per share. However, at a purchase price of $20 per share, the maximum number of
shares of Common Stock that could be offered in the Conversion would be
1,696,250 shares compared to a maximum of 3,392,500 shares at $10 per share.
Therefore, the Company determined to offer the Common Stock in the Conversion at
the price of $10.00 per share to increase the number of shares available for
purchase by policyholders. There were no other factors considered by the Board
of Directors of the Company in determining to offer shares of Common Stock at
$10.00 per share in the Conversion. The Purchase Price will be $10.00 per share
regardless of any change in the estimated consolidated pro forma market value of
Mercer Mutual following the Conversion as a subsidiary of the Company, as
determined by Sheshunoff. The Company plans to issue between 2,507,500 and
3,392,500 shares (exclusive of purchases by the ESOP) of the Common Stock in the
Conversion. This range was determined by dividing the price per share into the
Estimated Valuation Range.
 
     The Plan requires that an appraiser establish a valuation range (the
"Estimated Valuation Range") consisting of a midpoint valuation (the "Total
Midpoint"), a valuation 15 percent (15%) above the midpoint valuation (the
"Total Maximum") and a valuation 15 percent (15%) below the midpoint valuation
(the "Total Minimum"). Accordingly, Sheshunoff has established an Estimated
Valuation Range of $25,075,000 to $33,925,000. Upon completion of the Conversion
Offerings, after taking into account factors similar to those involved in its
initial Appraisal, Sheshunoff will submit to the Company and to the Pennsylvania
Department its updated estimate of the consolidated pro forma market value of
Mercer Mutual following the Conversion as a subsidiary of the Company
immediately prior to the completion of the Offerings. If such updated estimated
valuation does not fall within the Estimated Valuation Range, the Company may
cancel the Offerings and terminate the Plan. If the Company proceeds with the
Offerings using the updated estimated valuation, subscribers will be promptly
notified by mail of the updated estimated valuation and subscribers will be
given an opportunity to confirm or modify their orders. The funds of any
subscribers who do not withdraw or confirm their orders will be returned
promptly without interest. Subscription orders may not be withdrawn for any
reason if the updated appraisal is within the Estimated Valuation Range.
 
     There is a difference of approximately $8.9 million between the Total
Minimum and the Total Maximum of the Estimated Valuation Range. As a result, the
percentage interest in the Company that a subscriber for a fixed number of
shares of Common Stock will have is approximately 26% smaller if 3,392,500
shares are sold than if 2,507,500 shares are sold. Furthermore, as a result of
this broad range, the updated appraisal may estimate a consolidated pro forma
market value for Mercer Mutual as subsidiary of the Company that is materially
more or less than the aggregate dollar amount of subscriptions received by the
Company. Subscribers will not receive a refund or have any right to withdraw
subscriptions if the updated appraisal

                                       83
<PAGE>   84
 
estimates a consolidated pro forma market value that is less than the aggregate
dollar amount of subscriptions received by the Company. Therefore, subscribers,
in the aggregate and on a per share basis, may pay more for the Common Stock
than the estimated consolidated pro forma market value of Mercer Mutual as
subsidiary of the Company. Accordingly, no assurance can be given that the
market price for the Common Stock immediately following the Conversion will
equal or exceed the Purchase Price. Also, subscribers should be aware that,
prior to the consummation of the Offerings, they will not have available to them
information concerning the final updated Appraisal. After completion of the
Offerings, the final updated Appraisal will be filed with the Securities and
Exchange Commission pursuant to a post-effective amendment to the registration
statement of which this prospectus forms a part. See "Available Information."
 
     THE APPRAISAL IS NOT INTENDED, AND MUST NOT BE CONSTRUED, AS A
RECOMMENDATION OF ANY KIND AS TO THE ADVISABILITY OF PURCHASING COMMON STOCK. IN
PREPARING THE VALUATION, SHESHUNOFF HAS RELIED UPON AND ASSUMED THE ACCURACY AND
COMPLETENESS OF FINANCIAL AND STATISTICAL INFORMATION PROVIDED BY THE COMPANY
AND MERCER MUTUAL. SHESHUNOFF DID NOT INDEPENDENTLY VERIFY THE FINANCIAL
STATEMENTS AND OTHER INFORMATION PROVIDED BY THE COMPANY AND MERCER MUTUAL AND
SHESHUNOFF DID NOT VALUE INDEPENDENTLY THE ASSETS AND LIABILITIES OF THE COMPANY
AND MERCER MUTUAL. THE VALUATION CONSIDERS THE COMPANY AND MERCER MUTUAL ONLY AS
A GOING CONCERN AND SHOULD NOT BE CONSIDERED AS AN INDICATION OF THE LIQUIDATION
VALUE OF THE COMPANY AND MERCER MUTUAL. MOREOVER, BECAUSE SUCH VALUATION IS
NECESSARILY BASED UPON ESTIMATES AND PROJECTIONS OF A NUMBER OF MATTERS, ALL OF
WHICH ARE SUBJECT TO CHANGE FROM TIME TO TIME, NO ASSURANCE CAN BE GIVEN THAT
PERSONS PURCHASING COMMON STOCK WILL THEREAFTER BE ABLE TO SELL SUCH SHARES AT
OR ABOVE THE INITIAL PURCHASE PRICE. COPIES OF THE APPRAISAL REPORT OF
SHESHUNOFF SETTING FORTH THE METHOD AND ASSUMPTIONS FOR SUCH APPRAISAL ARE ON
FILE AND AVAILABLE FOR INSPECTION AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
COMPANY. ANY SUBSEQUENT UPDATED APPRAISAL REPORT OF SHESHUNOFF ALSO WILL BE
AVAILABLE FOR INSPECTION.
 
     If the updated estimated valuation Sheshunoff submits to the Company and
the Pennsylvania Department upon completion of the Offerings falls within the
Estimated Valuation Range, the following steps will be taken:
 
  Subscription Offering Meets or Exceeds Total Maximum.
 
     If, upon conclusion of the Conversion Offerings, the number of shares
subscribed for by participants in the Subscription Offering is equal to or
greater than 3,392,500 shares, then in such event the Conversion shall be
promptly consummated and the Company shall, on the effective date of the
Conversion (the "Effective Date"), issue shares of Common Stock to the
subscribing participants; provided, however, that the number of shares of Common
Stock issued shall not exceed the number of shares of Common Stock offered in
the Subscription Offering. In the event of an oversubscription in the
Subscription Offering, shares of Common Stock shall be allocated among the
subscribing participants in the priorities set forth in the Plan; provided,
however, that no fractional shares of Common Stock shall be issued. See
"-- Subscription Offering" herein.
 
  Subscription Offering Meets or Exceeds Total Minimum.
 
     If, upon conclusion of the Conversion Offerings, the number of shares of
Common Stock subscribed for by participants in the Subscription Offering is
equal to or greater than 2,507,500 shares, but less than 3,392,500 shares, then
in such event the Company may promptly consummate the Conversion, in which case
the Company shall on the Effective Date issue to the subscribing participants
shares of Common Stock in an amount sufficient to satisfy the subscriptions of
such participants in full. Prior to consummating the Conversion, however, the
Company shall have the right in its absolute discretion to accept, in whole or
in part, subscriptions received from any or all subscribers in the Community
Offering and/or to offer shares of Common Stock to purchasers in the Syndicated
Community Offering; provided, however, that no more than 3,392,500 shares of
Common Stock shall be issued in the Offerings (not including shares issued to
the ESOP); and, provided further, that no fractional shares of Common Stock
shall be issued.
 
                                       84
<PAGE>   85
 
  Subscription Offering Does Not Meet Total Minimum.
 
     If, upon conclusion of the Conversion Offerings, the number of shares of
Common Stock subscribed for by participants in the Subscription Offering is less
than 2,507,500 shares, the Company will accept subscriptions received from
subscribers in the Community Offering and/or sell shares of Common Stock to
purchasers in a Syndicated Community Offering so that the aggregate number of
shares of Common Stock sold in the Offerings is equal to or greater than
2,507,500 shares. The Conversion will be consummated promptly and the Company
shall on the Effective Date: (i) issue to subscribing participants in the
Subscription Offering shares of Common Stock in an amount sufficient to satisfy
the subscriptions of such participants in full, and (ii) issue to subscribers in
the Community Offering and/or to purchasers in any Syndicated Community Offering
such additional number of shares of Common Stock such that the aggregate number
of shares of Common Stock to be issued in the Offerings will be equal to
2,507,500 shares; provided, however, that no fractional shares of Common Stock
will be issued. In order to raise additional capital, the Company may in its
absolute discretion elect to issue in excess of 2,507,500 shares of Common Stock
to subscribers in the Community Offering and/or to purchasers in any Syndicated
Community Offering; provided, however, that the number of shares of Common Stock
issued shall not exceed 3,392,500 shares of Common Stock (not including shares
issued to the ESOP). See "The Conversion -- The Conversion
Offerings -- Community Offering" and "-- Syndicated Community Offering."
 
  Offerings Do Not Meet Minimum.
 
     If the aggregate number of shares of Common Stock subscribed for in the
Offerings is less than 2,507,500 shares, then in such event the Company will
cancel the Offerings and all subscription funds will be returned promptly to
subscribers without interest.
 
TAX EFFECTS.
 
  General.
 
     Mercer Mutual has obtained from the IRS a private letter ruling (the "PLR")
concerning the material tax effects of the Conversion and the Subscription
Offering to Mercer Mutual, Eligible Policyholders, and certain other
participants in the Subscription Offering.
 
     The PLR confirms, among other things, that the Conversion of Mercer Mutual
from a mutual to stock form of corporation will constitute a reorganization
within the meaning of Section 368(a)(1)(E) of the Internal Revenue Code of 1986,
as amended (the "Code"), and that, for federal income tax purposes: (i) no gain
or loss will be recognized by Mercer Mutual in its pre-Conversion mutual or
post-Conversion stock form as a result of the reorganization; (ii) Mercer
Mutual's basis in its assets, holding period for its assets, net operating loss
carryforward, if any, capital loss carryforward, if any, earnings and profits
and accounting methods will not be affected by the reorganization; (iii) as
discussed below, Eligible Policyholders will be required to recognize gain upon
the receipt of subscription rights if and to the extent that the subscription
rights that are allocated to an Eligible Policyholder are determined to have
fair market value; (iv) the basis of the Common Stock purchased by an Eligible
Policyholder pursuant to the exercise of subscription rights will equal the sum
of the Purchase Price of such stock, plus the gain, if any, recognized by the
Eligible Policyholder on the subscription rights that are exercised by the
Eligible Policyholder; and (v) the holding period of the Common Stock purchased
by an Eligible Policyholder pursuant to the exercise of subscription rights will
begin on the date on which the subscription rights are exercised. In all other
cases, the holding period of Common Stock purchased by an Eligible Policyholder
will begin on the date following the date on which the stock is purchased.
 
  Subscription Rights.
 
     Generally, the federal income tax consequences of the receipt, exercise and
lapse of subscription rights are uncertain. They present novel issues of tax law
which are not addressed by any direct authorities. Nevertheless, the IRS has
ruled in the PLR that any gain realized by an Eligible Policyholder as a result
of the receipt of subscription rights with a fair market value must be
recognized, whether or not such rights are
 
                                       85
<PAGE>   86
 
exercised. The amount of gain recognized by each Eligible Policyholder should
equal the fair market value of subscription rights received by the Eligible
Policyholder. If an Eligible Policyholder is required to recognize gain on the
receipt of subscription rights and does not exercise some or all of such
subscription rights, such Eligible Policyholder should recognize a corresponding
loss upon the expiration or lapse of such Eligible Policyholder's unexercised
subscription rights. The amount of such loss should equal the gain previously
recognized upon receipt of such unexercised subscription rights, although such
loss may not have the same character as the corresponding gain. Although not
free from doubt, provided the subscription rights are capital assets in the
hands of an Eligible Policyholder, any gain resulting from the receipt of the
subscription rights should constitute a capital gain, and provided the Common
Stock that an Eligible Policyholder would have received upon exercise of the
lapsed subscription rights would have constituted a capital asset, the resulting
loss upon expiration of such subscription rights should constitute a capital
loss. For purposes of determining gain, it is unclear how the subscription
rights should be valued or how to determine the number of subscription rights
that may be allocated to each Eligible Policyholder during the Subscription
Offering.
 
     In the opinion of Sheshunoff, the subscription rights do not have any fair
market value, inasmuch as such rights are nontransferable, personal rights of
short duration, that are provided to Eligible Policyholders and other
participants in the Subscription Offering without charge, and afford the holder
only the right to purchase shares of Common Stock in the Subscription Offering
at a price equal to its estimated fair market value, which is the same price at
which such stock will be sold to purchasers in the Community Offering or the
Syndicated Community Offering, if any. Nevertheless, Eligible Policyholders are
encouraged to consult with their tax advisors about the tax consequences of the
Conversion and the Subscription Offering.
 
     THE FEDERAL INCOME TAX DISCUSSION SET FORTH ABOVE DOES NOT PURPORT TO
CONSIDER ALL ASPECTS OF FEDERAL INCOME TAXATION WHICH MAY BE RELEVANT TO EACH
ELIGIBLE POLICYHOLDER THAT MAY BE SUBJECT TO SPECIAL TREATMENT UNDER THE CODE,
SUCH AS TRUSTS, INDIVIDUAL RETIREMENT ACCOUNTS, OTHER EMPLOYEE BENEFIT PLANS,
INSURANCE COMPANIES, AND ELIGIBLE POLICYHOLDERS WHO ARE EMPLOYEES OF AN
INSURANCE COMPANY OR WHO ARE NOT CITIZENS OR RESIDENTS OF THE UNITED STATES. DUE
TO THE INDIVIDUAL NATURE OF TAX CONSEQUENCES, EACH ELIGIBLE POLICYHOLDER IS
URGED TO CONSULT HIS OR HER TAX AND FINANCIAL ADVISOR AS TO THE EFFECT OF SUCH
FEDERAL INCOME TAX CONSEQUENCES ON HIS OR HER OWN PARTICULAR FACTS AND
CIRCUMSTANCES, INCLUDING THE RECEIPT AND EXERCISE OF SUBSCRIPTION RIGHTS, AND
ALSO AS TO ANY STATE, LOCAL, FOREIGN OR OTHER TAX CONSEQUENCES ARISING OUT OF
THE CONVERSION.
 
PURCHASES IN THE CONVERSION OFFERINGS.
 
  Termination Dates.
 
     The Conversion Offerings will expire at 1:00 p.m., Eastern Standard Time,
on March 3, 1999, unless extended by the Board of Directors of the Company to a
date no later than April 11, 1999 (the date and time of termination, including
any extension, are referred to herein as the "Termination Date"). Subscription
rights not exercised prior to the Termination Date will be void. If the Company
extends the Subscription Offering or the Community Offering, it will give
written notice of such extension to all subscribers on or before March 3, 1999.
In such event, each subscriber may withdraw or confirm his or her subscription
by the extended Termination Date. If a subscriber does not confirm a
subscription by the extended Termination Date, the subscriber's funds will be
returned promptly without interest. No action to extend the Subscription
Offering or Community Offering may be taken by the Company after March 3, 1999.
 
     Orders will not be executed by the Company until at least 2,507,500 shares
of Common Stock have been subscribed for or sold. If at least the 2,507,500
shares of Common Stock have not been subscribed for or sold by the Termination
Date, all funds delivered to the Company pursuant to the Offerings will be
promptly returned to subscribers without interest.
 
                                       86
<PAGE>   87
 
  Use of Order Forms.
 
     Rights to subscribe may be exercised only by completion of a Stock Order
Form. Any person who desires to subscribe for shares of Common Stock must do so
prior to the Termination Date by delivering by mail to the Conversion Center at
P.O. Box 15, Pennington, New Jersey 08534-0015, or in person at the Company's
principal executive offices located at 10 North Highway 31, Pennington, New
Jersey, a properly executed and completed Stock Order Form, together with full
payment for all shares for which the subscription is made. All checks or money
orders must be made payable to "MERCER INSURANCE GROUP, INC." All subscription
rights under the Plan will expire at 1:00 p.m., local time, on the Termination
Date whether or not the Company has been able to locate each person entitled to
such subscription rights. ONCE TENDERED, ORDERS TO PURCHASE COMMON STOCK IN THE
OFFERING CANNOT BE REVOKED.
 
     To ensure that each purchaser receives a prospectus at least 48 hours prior
to the Termination Date in accordance with Rule 15c2-8 under the Exchange Act,
no Prospectus will be mailed any later than five days prior to such date or hand
delivered any later than two days prior to such date. Execution of the Stock
Order Form will confirm receipt or delivery in accordance with Rule 15c2-8.
Stock Order Forms will be distributed only with a Prospectus. Photocopies and
facsimile copies of Stock Order Forms will not be accepted. Payment by cash,
check or money order must accompany the Stock Order Form. No wire transfers will
be accepted.
 
     Each subscription right may be exercised only by the Eligible Policyholder
to whom it is issued and only for his or her own account. THE SUBSCRIPTION
RIGHTS GRANTED UNDER THE PLAN ARE NONTRANSFERABLE. Each Eligible Policyholder
subscribing for shares of Common Stock is required to represent to the Company
that such Eligible Policyholder is purchasing such shares for such Eligible
Policyholder's own account and that such Eligible Policyholder has no agreement
or understanding with any other person for the sale or transfer of such shares.
The Company is not aware of any restrictions which would prohibit Eligible
Policyholders who purchase shares of Common Stock in the Conversion, and who are
not executive officers or directors of the Company or Mercer Mutual, from freely
transferring such shares after the Conversion. See "-- Limitations on Resales."
 
     In the event a subscriber submits a Stock Order Form that (i) is not
delivered and is returned to the sender by the United States Postal Service or
the Company is unable to locate the addressee, (ii) is not returned or is
received after the Termination Date (iii) is defectively completed or executed,
or (iv) is not accompanied by payment in full for the shares of Common Stock
subscribed for, any subscription rights of such subscriber will not be honored,
and such subscriber will be treated as having failed to return the completed
Stock Order Form within the time period specified therein. Alternatively, the
Company may (but will not be required to) waive any irregularity relating to any
Stock Order Form or require the submission of a corrected Stock Order Form or
the remittance of full payment for the shares of Common Stock subscribed for by
such date as the Company may specify. Subscription orders, once tendered, may
not be revoked. The Company's interpretations of the terms and conditions of the
Plan and determinations with respect to the acceptability of the Stock Order
Forms will be final, conclusive and binding upon all persons and neither the
Company nor Mercer Mutual (or the directors, officers, employees and agents of
any of them) shall be liable to any person in connection with any such
interpretation or determination.
 
  Payment for Shares.
 
     Payment in full for all subscribed shares of Common Stock is required to
accompany all completed Stock Order Forms for subscriptions to be considered
complete. Payment for subscribed shares of Common Stock may be made by check or
money order in U.S. Dollars. Payments will be placed in an Escrow Account at
State Street Bank and Trust Company, N.A. (the "Escrow Agent"). The Escrow
Account will be administered by the Escrow Agent. An executed Stock Order Form,
once received by the Company, may not be modified, amended or rescinded without
the consent of the Company. Funds accompanying Stock Order Forms will not be
released until the Conversion is completed or terminated.
 
     The ESOP will not be required to pay for the shares at the time it
subscribes, but is required to pay for such shares at or before the completion
of the Offerings.
 
                                       87
<PAGE>   88
 
  Delivery of Certificates.
 
     Certificates representing shares of the Common Stock will be delivered to
subscribers promptly after completion of the Offerings. Until certificates for
the Common Stock are available and delivered to subscribers, subscribers may not
be able to sell the shares of Common Stock for which they subscribed even though
trading of the Common Stock will have commenced.
 
MARKETING AND UNDERWRITING ARRANGEMENTS
 
     Mercer Mutual and the Company have engaged Sandler O'Neill as a financial
advisor in connection with the offering of the Common Stock, and Sandler O'Neill
has agreed to use its best efforts to assist the Company with its solicitation
of subscriptions and purchase orders for shares of Common Stock in the
Offerings. Sandler O'Neill is not obligated to take or purchase any shares of
Common Stock in the Offerings. Mercer Mutual and the Company have agreed to pay
Sandler O'Neill a fee equal to 2.0% of the aggregate Purchase Price of Common
Stock sold in the Conversion Offerings, excluding subscriptions by any director,
officer or employee of Mercer Mutual or the Company or members of their
immediate families or the ESOP, for which Sandler O'Neill will not receive a
fee. In the event that the Company enters into selected dealers' agreements with
one or more NASD member firms in connection with a Syndicated Community
Offering, the Company will pay a fee to such selected dealer, any sponsoring
dealer's fees, and a management fee to Sandler O'Neill of 1.5% for shares sold
by the NASD member firm pursuant to such selected dealer's agreement; provided,
however, that the aggregate fees payable to Sandler O'Neill for Common Stock
sold pursuant to such selected dealer's agreement shall not exceed 2.0% of the
aggregate Purchase Price and that the aggregate fees payable to Sandler O'Neill
and the selected and sponsoring dealers will not exceed 7% of the aggregate
Purchase Price of the shares sold under any such agreement. Fees to Sandler
O'Neill and to any other broker-dealer may be deemed to be underwriting fees and
Sandler O'Neill and such broker-dealers may be deemed to be underwriters.
Sandler O'Neill will also be reimbursed for its reasonable out-of-pocket
expenses, including legal fees, in an amount not to exceed $75,000. In the event
the Conversion is not consummated or Sandler O'Neill ceases, under certain
circumstances after the subscription solicitation activities are commenced, to
provide assistance to the Company, Sandler O'Neill will be entitled to be
reimbursed for its reasonable out-of-pocket expenses incurred prior to
termination as described above. The Company and Mercer Mutual have agreed to
indemnify Sandler O'Neill for reasonable costs and expenses in connection with
certain claims or liabilities, including certain liabilities under the
Securities Act. Sandler O'Neill has received advances towards its fees and
expenses totaling $25,000. Total marketing fees to Sandler O'Neill are expected
to be $489,050 and $648,350 at the Total Minimum and the Total Maximum,
respectively. See "Pro Forma Data" for the assumptions used to arrive at these
estimates.
 
     Sandler O'Neill will also perform conversion agent services and records
management services for Mercer Mutual in the Conversion and will receive a fee
for this service of $30,000, plus reimbursement of reasonable out-of-pocket
expenses.
 
     Directors and executive officers of the Company and Mercer Mutual may
participate in the solicitation of offers to purchase Common Stock. Other
employees of Mercer Mutual may participate in the Offerings in ministerial
capacities or by providing clerical work in effecting a sales transaction. Other
questions from prospective purchasers will be directed to executive officers or
registered representatives. Such other employees have been instructed not to
solicit offers to purchase Common Stock or provide advice regarding the purchase
of Common Stock. The Company will rely on Rule 3a4-1 under the Exchange Act, and
sales of Common Stock will be conducted within the requirements of Rule 3a4-1,
so as to permit officers, directors and employees to participate in the sale of
Common Stock. No officer, director or employee of the Company or Mercer Mutual
will be compensated in connection with his participation by the payment of
commissions or other remuneration based either directly or indirectly on the
transactions in the Common Stock.
 
SYNDICATED COMMUNITY OFFERING
 
     As a final step in the Conversion, the Plan provides that, in the sole
discretion of the Company, all shares of Common Stock not purchased in the
Conversion Offerings, if any, may be offered for sale to the general
 
                                       88
<PAGE>   89
 
public in a Syndicated Community Offering through a syndicate of registered
broker-dealers to be formed and managed by Sandler O'Neill acting as agent of
the Company, to assist the Company and Mercer Mutual in the sale of the Common
Stock. THE COMPANY AND MERCER MUTUAL RESERVE THE RIGHT TO REJECT ORDERS IN WHOLE
OR PART IN THEIR SOLE DISCRETION IN THE SYNDICATED COMMUNITY OFFERING. Neither
Sandler O'Neill nor any registered broker-dealer shall have any obligation to
take or purchase any shares of the Common Stock in the Syndicated Community
Offering; however, Sandler O'Neill has agreed to use its best efforts in the
sale of shares in the Syndicated Community Offering.
 
     The price at which Common Stock is sold in the Syndicated Community
Offering will be the Purchase Price. Shares of Common Stock purchased in the
Syndicated Community Offering by any persons, together with associates of or
persons acting in concert with such persons, will be aggregated with purchases
in the Conversion Offerings for purposes of the maximum purchase limitation of
100,000 shares.
 
     In addition to the foregoing, if a syndicate of broker-dealers ("selected
dealers") is formed to assist in the Syndicated Community Offering, a purchaser
may pay for his shares with funds held by or deposited with a selected dealer.
If a Stock Order Form is executed and forwarded to the selected dealer or if the
selected dealer is authorized to execute the Stock Order Form on behalf of a
purchaser, the selected dealer is required to forward the Stock Order Form and
funds to Mercer Mutual for deposit in a segregated account on or before noon of
the business day following receipt of the Stock Order Form or execution of the
Stock Order Form by the selected dealer. Alternatively, selected dealers may
solicit indications of interest from their customers to place orders for shares.
Such selected dealers shall subsequently contact their customers who indicated
an interest and seek their confirmation as to their intent to purchase. Those
indicating an intent to purchase shall execute Stock Order Forms and forward
them to their selected dealer or authorize the selected dealer to execute such
forms. The selected dealer will acknowledge receipt of the order to its customer
in writing on the following business day and will debit such customer's account
on the third business day after the customer has confirmed his intent to
purchase (the "debit date") and on or before noon of the next business day
following the debit date will send Stock Order Forms and funds to Mercer Mutual
for deposit in a segregated account. Although purchasers' funds are not required
to be in their accounts with selected dealers until the debit date in the event
that such alternative procedure is employed, once a confirmation of an intent to
purchase has been received by the selected dealer, the purchaser has no right to
rescind his order.
 
     Certificates representing shares of Common Stock purchased, together with
any refund due, will be mailed to purchasers at the address specified in the
Stock Order Form as soon as practicable following consummation of the sale of
the Common Stock. Any certificates returned as undeliverable will be disposed of
in accordance with applicable law.
 
     The Syndicated Community Offering will terminate no more than 45 days
following the Termination Date.
 
LIMITATIONS ON PURCHASES OF COMMON STOCK
 
     The Plan provides for certain limitations upon the purchase of shares in
the Conversion. No person may purchase fewer than 25 shares of Common Stock in
the Conversion. Except for the ESOP, which intends to purchase 10% of the total
number of shares of Common Stock issued in the Conversion, no purchaser
(including Eligible Policyholders who elect to purchase stock in the Conversion)
together with such person's affiliates and associates (as defined in the Plan)
or a group acting in concert (as defined in the Plan) may purchase more than
100,000 shares of Common Stock in the Conversion (4.0%, 3.4% and 3.0% of the
number of shares to be issued in the Conversion at the Total Minimum, Total
Midpoint and Total Maximum, respectively, of the Estimated Valuation Range). The
Plan states that subscribers in the Subscription Offering can purchase up to
100,000 shares. There are 42,178 Eligible Policyholders. In the event that
subscriptions by Eligible Policyholders for Common Stock exceed the maximum of
the Estimated Valuation Range, the Company will be obligated under the Plan to
sell to Eligible Policyholders 3,392,500 shares, which is the maximum number of
shares offered hereby, and shares of Common Stock would be allocated among
Eligible Policyholders in proportion to their respective amounts subscribed for.
If each Eligible Policyholder subscribed for 100,000 shares of Common Stock
offered, then each Eligible Policyholder would receive only
 
                                       89
<PAGE>   90
 
approximately 80 shares. Except as set forth below under "-- Proposed Management
Purchases," the Company is unable to predict the number of Eligible
Policyholders that may participate in the Subscription Offering or the extent of
any such participation.
 
     Shares of Common Stock to be held by the ESOP and attributable to a
participant thereunder shall not be aggregated with shares of Common Stock
purchased by such participant or any other purchase of Common Stock in the
Conversion.
 
     Officers and directors of Mercer Mutual and the Company, together with
their associates, may not purchase, in the aggregate, more than thirty-four
percent (34.0%) of the shares of Common Stock. Directors of the Company and of
Mercer Mutual shall not be deemed to be associates of one another or a group
acting in concert with other directors solely as a result of membership on the
Board of Directors of the Company or the Board of Directors of Mercer Mutual or
any subsidiary of Mercer Mutual.
 
     Subject to any required regulatory approval and the requirements of
applicable law, the Company may increase or decrease any of the purchase
limitations at any time. In the event that the individual purchase limitation is
increased after commencement of the Conversion Offerings, the Company shall
permit any person who subscribed for the maximum number of shares of Common
Stock to purchase an additional number of shares, such that such person shall be
permitted to subscribe for the then maximum number of shares permitted to be
subscribed for by such person, subject to the rights and preferences of any
person who has priority subscription rights. In the event that either the
individual purchase limitation or the number of shares of Common Stock to be
sold in the Conversion is decreased after commencement of the Conversion
Offerings, the order of any person who subscribed for the maximum number of
shares of Common Stock shall be decreased by the minimum amount necessary so
that such person shall be in compliance with the then maximum number of shares
permitted to be subscribed for by such person.
 
     Each person purchasing Common Stock in the Conversion shall be deemed to
confirm that such purchase does not conflict with the purchase limitations under
the Plan or otherwise imposed by law. In the event that such purchase
limitations are violated by any person (including any associate or affiliate of
such person or person otherwise acting in concert with such person), the Company
shall have the right to purchase from such person at the Purchase Price all
shares acquired by such person in excess of any such purchase limitation or, if
such excess shares have been sold by such person, to receive the difference
between the aggregate Purchase Price paid for such excess shares and the
proceeds received by such person from the sale of such excess shares. This right
of the Company to purchase such excess shares shall be assignable by the
Company.
 
     The Company shall have the right in its absolute discretion and without
liability to any subscriber, purchaser, underwriter or any other person: (i) to
determine which subscriptions, if any, to accept in the Community Offering and
to accept or reject any such subscription in whole or in part for any reason or
for no reason, and (ii) to determine whether and to what extent shares of Common
Stock are to be offered or sold in a Syndicated Community Offering.
 
                                       90
<PAGE>   91
 
PROPOSED MANAGEMENT PURCHASES
 
     The following table sets forth information regarding the approximate number
of shares of Common Stock intended to be purchased by each of the directors and
executive officers of the Company and Mercer Mutual, including each such
person's associates, and by all directors, trustees and executive officers as a
group, including all of their associates, and other related information. For
purposes of the following table, it has been assumed that sufficient shares will
be available to satisfy subscriptions in all categories.
 
<TABLE>
<CAPTION>
                                                                   TOTAL
NAME                                                          SHARES(1)(2)(3)
- ----                                                          ---------------
<S>                                                           <C>
Roland D. Boehm(4)(5).......................................       20,000
James J. Freda(4)...........................................       15,000
William C. Hart(4)(6).......................................       15,000
George T. Hornyak, Jr.(4)...................................      100,000
Richard U. Niedt(4).........................................        6,000
Andrew R. Speaker(4)(7).....................................       10,000
Richard G. Van Noy(4)(8)....................................       15,000
Marion J. Crum(9)...........................................        1,000
John Danka(9)...............................................        1,500
Paul Ehrhardt(9)............................................        2,500
                                                                  -------
     Total..................................................      186,000
                                                                  =======
</TABLE>
 
- ---------------
(1) Does not include shares that could be allocated to participants in the ESOP,
    under which officers and other employees would be allocated, in the
    aggregate, 10% of the Common Stock issued in the Conversion. See "Management
    of the Company -- Certain Benefit Plans and Agreements -- Employee Stock
    Ownership Plan."
 
(2) Does not include shares that would be awarded to participants in the MRP, if
    implemented, under which directors, officers and other employees would be
    awarded, at no cost to them, an aggregate number of shares equal to 4% of
    the Common Stock issued in the Conversion (100,300, 118,000, 135,700 and
    150,778 shares at the Total Minimum, Total Midpoint, Total Maximum and Total
    Maximum plus ESOP shares, respectively). Implementation of the MRP requires
    shareholder approval. See "Management of the Company -- Certain Benefit
    Plans and Agreements -- Management Recognition Plan."
 
(3) Does not include shares that would be purchased by participants in the
    Compensation Plan, if implemented, under which directors, executive officers
    and other employees would be granted options to purchase an aggregate amount
    of Common Stock equal to 10% of the shares issued in the Conversion
    (250,750, 295,000, 339,250 and 376,944 shares at the Total Minimum, Total
    Midpoint, Total Maximum and Total Maximum plus ESOP shares). Implementation
    of the Compensation Plan requires shareholder approval. See "Management of
    the Company -- Certain Benefit Plans and Agreements -- Stock Compensation
    Plan."
 
(4) Director of the Company and Mercer Mutual.
 
(5) Vice Chairman of the Board of Directors of the Company and Mercer Mutual.
 
(6) President and Chief Executive Officer of the Company and Mercer Mutual.
 
(7) Executive Vice President, Chief Operating Officer, Chief Financial Officer
    and Treasurer of the Company and Mercer Mutual.
 
(8) Chairman of the Board of Directors of the Company and Mercer Mutual.
 
(9) Executive officer of the Company and Mercer Mutual. See "Management of the
    Company -- Executive Officers."
 
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<PAGE>   92
 
LIMITATIONS ON RESALES
 
     The Common Stock issued in the Conversion will be freely transferable under
the Securities Act; provided, however that shares issued to directors and
officers of Mercer Mutual or of the Company would be restricted as to transfer
for a period of one year from the Effective Date pursuant to the provisions of
the Act and would be subject to additional resale restrictions under Rule 144 of
the Securities Act. Shares of Common Stock issued to directors and officers will
bear a legend giving appropriate notice of these restrictions and the Company
will give instructions to the transfer agent for the Common Stock with respect
to these transfer restrictions. Any shares issued to directors and officers as a
stock dividend, stock split or otherwise with respect to restricted stock shall
be subject to the same restrictions. Shares acquired by directors and officers
other than in the Conversion will not be subject to these restrictions.
 
     In addition, under guidelines of the NASD, members of the NASD and their
associates are subject to certain restrictions on the transfer of securities
purchased in accordance with subscription rights and to certain reporting
requirements upon purchase of such securities.
 
INTERPRETATION AND AMENDMENT OF THE PLAN OF CONVERSION
 
     To the extent permitted by law, all interpretations of the Plan by the
Board of Directors of Mercer Mutual and the Board of Directors of the Company
will be final. The Plan may be amended at any time before it is approved by the
Pennsylvania Department by the affirmative vote of two-thirds of the directors
of the Company and Mercer Mutual. The Plan similarly may be amended at any time
after it is approved by the Pennsylvania Department, subject to the Pennsylvania
Department's approval of such amendment. The Plan may be amended at any time
after it is approved by the Eligible Policyholders of Mercer Mutual and prior to
the Effective Date by the affirmative vote of two-thirds of the directors of the
Company and of Mercer Mutual then in office; provided, however, that any such
amendment shall be subject to approval by the Pennsylvania Department; and
provided further, that, if such amendment is determined by the Pennsylvania
Department to be material, such amendment shall be subject to approval by the
affirmative vote of at least two-thirds of the votes cast at a meeting of
Eligible Policyholders called for that purpose. In the event Eligible
Policyholders are required to approve an amendment to the Plan, the Company will
send a Proxy Statement to each Eligible Policyholder as soon as practical after
the amendment is approved by the directors of the Company and Mercer Mutual and,
if required, the Pennsylvania Department.
 
     In the event that the Pennsylvania Department adopts regulations containing
mandatory or optional provisions applicable to the Conversion prior to the
Effective Date, the Plan may be amended to conform to such regulations at any
time prior to such Effective Date by the affirmative vote of two-thirds of the
directors of the Company and Mercer Mutual, and no resolicitation of proxies or
further approval by Eligible Policyholders shall be required.
 
TERMINATION
 
     The Plan may be terminated at any time before it is approved by the
Pennsylvania Department by the affirmative vote of two-thirds of the directors
of the Company and Mercer Mutual. The Plan may be terminated at any time after
it is approved by the Pennsylvania Department by the affirmative vote of two-
thirds of the directors of the Company and Mercer Mutual. The Plan may be
terminated at any time after it is approved by Eligible Policyholders and prior
to the Effective Date by the affirmative vote of two-thirds of the directors of
the Company and Mercer Mutual provided, however, that any such termination shall
be subject to approval by the Pennsylvania Department.
 
CONDITIONS
 
     As required by the Plan, the Plan has been approved by the Pennsylvania
Department and the Board of Directors of the Company and Mercer Mutual.
Completion of the Conversion also requires approval of the Plan by the
affirmative vote of at least two-thirds of the votes cast by Eligible
Policyholders of Mercer Mutual. If the Eligible Policyholders do not approve the
Plan, the Plan will be terminated, and Mercer Mutual will continue to conduct
business as a mutual insurance company. See "Risk Factors -- Requirement for
Policyholder Approval."
 
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<PAGE>   93
 
                      CERTAIN RESTRICTIONS ON ACQUISITION
                                 OF THE COMPANY
 
PENNSYLVANIA LAW
 
     The Pennsylvania BCL contains certain provisions applicable to the Company
that may have the effect of impeding a change in control of the Company. These
provisions, among other things, (a) require that, following any acquisition by
any person or group of 20% of a public corporation's voting power, the remaining
shareholders have the right to receive payment for their shares, in cash, from
such person or group in an amount equal to the "fair value" of their shares,
including an increment representing a proportion of any value payable for
acquisition of control of the corporation; and (b) prohibit, for five years
after an interested shareholder's acquisition date, a "business combination"
(which includes a merger or consolidation of the corporation or a sale, lease or
exchange of assets having a minimum specified aggregate value or representing a
minimum specified percentage earning power or net income of the corporation)
with a shareholder or group of shareholders beneficially owning 20% or more of a
public corporation's voting power.
 
     In 1990, the Pennsylvania legislature further amended the Pennsylvania BCL
to expand the antitakeover protections afforded by Pennsylvania law by
redefining the fiduciary duty of directors and adopting disgorgement and
control-share acquisition statutes. To the extent applicable to the Company at
the present time, this legislation generally (a) expands the factors and groups
(including shareholders) that the Board of Directors can consider in determining
whether a certain action is in the best interests of the corporation; (b)
provides that the Board of Directors need not consider the interests of any
particular group as dominant or controlling; (c) provides that directors, in
order to satisfy the presumption that they have acted in the best interests of
the corporation, need not satisfy any greater obligation or higher burden of
proof with respect to actions relating to an acquisition or potential
acquisition of control; (d) provides that actions relating to acquisitions of
control that are approved by a majority of "disinterested directors" are
presumed to satisfy the directors' standard unless it is proven by clear and
convincing evidence that the directors did not assent to such action in good
faith after reasonable investigation; and (e) provides that the fiduciary duty
of directors is solely to the corporation and may be enforced by the corporation
or by a shareholder in a derivative action, but not by a shareholder directly.
 
     The 1990 amendments to the BCL explicitly provide that the fiduciary duty
of directors shall not be deemed to require directors (a) to redeem any rights
under, or to modify or render inapplicable, any shareholder rights plan; (b) to
render inapplicable, or make determinations under, provisions of the BCL
relating to control transactions, business combinations, control-share
acquisitions or disgorgement by certain controlling shareholders following
attempts to acquire control; or (c) to act as the board of directors, a
committee of the board or an individual director solely because of the effect
such action might have on an acquisition or potential or proposed acquisition of
control of the corporation or the consideration that might be offered or paid to
shareholders in such an acquisition. One of the effects of these fiduciary duty
provisions may be to make it more difficult for a shareholder to successfully
challenge the actions of the Company's Board of Directors in a potential change
in control context. Pennsylvania case law appears to provide that the fiduciary
duty standard under the 1990 amendment to the BCL grants directors the statutory
authority to reject or refuse to consider any potential or proposed acquisition
of the corporation.
 
     Under the Pennsylvania control-share acquisition statute, a person or group
is entitled to voting rights with respect to "control shares" only after
shareholders (both disinterested shareholders and all shareholders) have
approved the granting of such voting rights at a meeting of shareholders.
"Control shares" are shares acquired since January 1, 1988, that upon
acquisition of voting power by an "acquiring person," would result in a
"control-share acquisition." ("Control shares" also include voting shares where
beneficial ownership was acquired by the "acquiring person" within 180 days of
the control-share acquisition or with the intention of making a control-share
acquisition.) An "acquiring person" is a person or group who makes or proposes
to make a "control-share acquisition." A "control-share acquisition" is an
acquisition, directly or indirectly, of voting power over voting shares that
would, when added to all voting power of the person over other voting shares,
entitle the person to cast or direct the casting of such percentage of votes for
the first time with respect to any of the following ranges that all shareholders
would be entitled to cast in an election of directors: (a) at
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<PAGE>   94
 
least 20% but less than 33 1/3%; (b) at least 33 1/3 but less than 50%; or (c)
50% or more. The effect of these provisions is to require a new shareholder vote
when each threshold is exceeded. In the event shareholders do not approve the
granting of voting rights, voting rights are lost only with respect to "control
shares."
 
     A special meeting of shareholders is required to be called to establish
voting rights of control shares if an acquiring person (a) files with the
corporation an information statement containing specified information, (b) makes
a written request for a special meeting at the time of delivery of the
information statement, (c) makes a control-share acquisition or a bona fide
written offer to make a control-share acquisition, and (d) provides a written
undertaking at the time of delivery of the information statement to pay or
reimburse the corporation for meeting expenses. If the information statement is
filed and a control-share acquisition is made or proposed to be made, but no
request for a special meeting is made or no written undertaking to pay expenses
is provided, the issue of voting rights will be submitted to shareholders at the
next annual or special meeting of shareholders of the corporation.
 
     A corporation may redeem all "control shares" at the average of the high
and low sales price, as reported on a national securities exchange or national
quotation system or similar quotation system, on the date the corporation
provides notice of redemption (a) at any time within 24 months after the date on
which the control-share acquisition occurs if the acquiring person does not,
within 30 days after the completion of the control-share acquisition, properly
request that shareholders consider the issue of voting rights to be accorded to
control shares and (b) at any time within 24 months after the issue of voting
rights is submitted to shareholders and such voting rights either are not
accorded or are accorded and subsequently lapse. Voting rights accorded to
control shares by a vote of shareholders lapse and are lost if any proposed
control-share acquisition is not consummated within 90 days after shareholder
approval is obtained.
 
     A person will not be considered an "acquiring person" if the person holds
voting power within any of the ranges specified in the definition of
"control-share acquisition" as a result of a solicitation of revocable proxies
if such proxies (a) are given without consideration in response to a proxy or
consent solicitation made in accordance with the Exchange Act and (b) do not
empower the holder to vote the shares except on the specific matters described
in the proxy and in accordance with the instructions of the giver of the proxy.
 
     The statute does not apply to certain control-share acquisitions effected
pursuant to a gift or laws of inheritance, in connection with certain family
trusts or pursuant to a merger, consolidation or plan of share exchange if the
corporation is a party to the agreement.
 
     The effect of this statutory provision is to deter the accumulation of a
substantial block of Common Stock, including accumulation with a view to
effecting a non-negotiated tender or exchange offer for Common Stock.
 
     Under the disgorgement provisions of the Pennsylvania BCL, any profit
realized by any person or group who is or was a "controlling person or group"
from the disposition of any equity security of a corporation shall belong to and
be recoverable by the corporation where the profit is realized (i) within 18
months after the person becomes a "controlling person or group" and (ii) the
equity security had been acquired by the "controlling person or group" within 24
months prior to or 18 months after obtaining the status of a "controlling person
or group."
 
     A "controlling person or group" is a person or group who (a) has acquired,
offered to acquire or, directly or indirectly, publicly disclosed the intention
of acquiring 20% voting power of the corporation or (b) publicly disclosed that
it may seek to acquire control of the corporation.
 
     A person will not be deemed a "controlling person or group" if the person
holds voting power as a result of a solicitation of revocable proxies if, among
other things, such proxies (a) are given without consideration in response to a
proxy or consent solicitation made in accordance with the Exchange Act and (b)
do not empower the holder to vote the shares except on the specific matters
described in the proxy and in accordance
 
                                       94
<PAGE>   95
 
with the instructions of the giver of the proxy. This exception does not apply
to proxy contests in connection with or as a means toward acquiring control of
the Company.
 
     The effect of this statutory provision is to deter the accumulation of a
substantial block of Common Stock with a view to putting the Company "in play"
and then selling shares at a profit (whether to the Company, in the market or in
connection with an acquisition of the Company).
 
CERTAIN ANTI-TAKEOVER PROVISIONS IN THE ARTICLES OF INCORPORATION AND BYLAWS
 
     The Board believes that it is appropriate to include certain provisions as
part of the Company's Articles of Incorporation to protect the interests of the
Company and its shareholders from hostile takeovers that the Board might
conclude are not in the best interests of the Company or the Company's
shareholders. These provisions may have the effect of discouraging a future
takeover attempt that is not approved by the Board but which individual
shareholders may deem to be in their best interests or in which shareholders may
receive a substantial premium for their shares over the then current market
price. As a result, shareholders who might desire to participate in such a
transaction may not have an opportunity to do so. Such provisions will also
render the removal of the Company's current Board of Directors or management
more difficult. While the Board of Directors of the Company is not aware of any
specific effort that might be made to obtain control of the Company after the
Conversion, Franklin is currently making a hostile attempt to acquire control of
Mercer Mutual, and may continue such attempt after the completion of the
Conversion. See "Business -- Offer to Acquire Mercer Mutual" and "-- Legal
Proceedings."
 
     The following discussion is a general summary of certain provisions of the
Articles of Incorporation and Bylaws of the Company that may be deemed to have
such an "anti-takeover" effect. The description of these provisions is
necessarily general and reference should be made in each case to the Articles of
Incorporation and Bylaws of the Company. For information regarding how to obtain
a copy of these documents without charge, see "Additional Information."
 
  Classified Board of Directors and Related Provisions
 
     The Company's Articles of Incorporation provide that the Board of Directors
is to be divided into three classes which shall be as nearly equal in number as
possible. The directors in each class will hold office following their initial
appointment to office for terms of one year, two years and three years,
respectively, and, upon reelection, will serve for terms of three years
thereafter. Each director will serve until his or her successor is elected and
qualified. The Articles of Incorporation provide that a director may be removed
by shareholders only upon the affirmative vote of at least a majority of the
votes which all shareholders would be entitled to cast. The Articles of
Incorporation further provide that any vacancy occurring in the Board of
Directors, including a vacancy created by an increase in the number of
directors, shall be filled for the remainder of the unexpired term by a majority
vote of the directors then in office.
 
     A classified board of directors could make it more difficult for
shareholders, including those holding a majority of the outstanding shares, to
force an immediate change in the composition of a majority of the Board of
Directors. Because the terms of only one-third of the incumbent directors expire
each year, it requires at least two annual elections for the shareholders to
change a majority, whereas a majority of a non-classified board may be changed
in one year. In the absence of the provisions of the Articles of Incorporation
classifying the Board, all of the directors would be elected each year.
 
     Management of the Company believes that the staggered election of directors
tends to promote continuity of management because only one-third of the Board of
Directors is subject to election each year. Staggered terms guarantee that in
the ordinary course approximately two-thirds of the Directors, or more, at any
one time have had at least one year's experience as directors of the Company,
and moderate the pace of change in the composition of the Board of Directors by
extending the minimum time required to elect a majority of Directors from one to
two years.
 
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<PAGE>   96
 
  Other Antitakeover Provisions
 
     The Company's Articles of Incorporation and Bylaws contain certain other
provisions that may also have the effect of deterring or discouraging, among
other things, a non-negotiated tender or exchange offer for the Common Stock, a
proxy contest for control of the Company, the assumption of control of the
Company by a holder of a large block of the Common Stock and the removal of the
Company's management. These provisions: (1) empower the Board of Directors,
without shareholder approval, to issue preferred stock, the terms of which,
including voting power, are set by the Board; (2) restrict the ability of
shareholders to remove directors; (3) require that shares with at least 80% of
total voting power approve mergers and other similar transactions, if the
transaction is not approved, in advance, by the Board of Directors; (4) prohibit
shareholders' actions without a meeting; (5) eliminate the right of shareholders
to call a special meeting; (6) require that shares with at least 80%, or in
certain instances a majority, of total voting power approve the repeal or
amendment of the Articles of Incorporation; (7) require any person who acquires
stock of the Company with voting power of 25% or more to offer to purchase for
cash all remaining shares of the Company's voting stock at the highest price
paid by such person for shares of the Company's voting stock during the
preceding year; (8) limit the right of a person or entity to vote more than 10%
of the Company's voting stock; (9) eliminate cumulative voting in elections of
directors; and (10) require that shares with at least 66 2/3% of total voting
power approve, repeal or amend the Bylaws.
 
     Should Franklin continue its hostile attempt to acquire Mercer Mutual after
the approval of the Plan by the Eligible Policyholders at the Special Meeting
(see "Business -- Offer to Acquire Mercer Mutual"), the Company's Board of
Directors may consider adopting a shareholder rights plan in the form adopted by
many companies that have publicly-traded common stock. Such plans typically
provide for the issuance of rights to all shareholders that, in the event of a
hostile takeover attempt of the issuer, become exercisable and permit all
shareholders (except for the hostile acquiror) to acquire shares of the common
stock of the issuer or the acquiror at a price that is substantially less than
the market price. The Company's Board of Directors has not made any
determination as to whether it would adopt such a rights plan. The adoption of
such a rights plan would not require shareholder approval.
 
                          DESCRIPTION OF CAPITAL STOCK
 
GENERAL
 
     The Company is authorized to issue 15,000,000 shares of Common Stock,
without par value, and 5,000,000 shares of preferred stock, having such par
value as the Board of Directors of the Company shall fix and determine. The
Company currently expects to issue between 2,507,500 and 3,392,500 shares (or,
as permitted by the Plan, in the event the ESOP purchases shares in excess of
the maximum of the Estimated Valuation Range in order to satisfy its 10%
subscription, up to 3,769,444 shares), subject to adjustment, of the Common
Stock and no shares of preferred stock in the Conversion.
 
COMMON STOCK
 
  Voting Rights
 
     Each share of the Common Stock will have the same relative rights and will
be identical in all respects with every other share of the Common Stock. The
holders of the Common Stock will possess exclusive voting rights in the Company,
except to the extent that shares of preferred stock issued in the future may
have voting rights, if any. Each holder of shares of the Common Stock will be
entitled to one vote for each share held of record on all matters submitted to a
vote of holders of shares of the Common Stock. Holders of Common Stock will not
be entitled to cumulate their votes for election of directors.
 
                                       96
<PAGE>   97
 
  Dividends
 
     The Company may, from time to time, declare dividends to the holders of
Common Stock, who will be entitled to share equally in any such dividends. For
additional information as to cash dividends, see "Dividend Policy."
 
  Liquidation
 
     In the event of any liquidation, dissolution or winding up of Mercer
Mutual, the Company, as holder of all of the capital stock of Mercer Mutual,
would be entitled to receive all assets of Mercer Mutual after payment of all
debts and liabilities of Mercer Mutual. In the event of a liquidation,
dissolution or winding up of the Company, each holder of shares of Common Stock
would be entitled to receive, after payment of all debts and liabilities of the
Company, a pro rata portion of all assets of the Company available for
distribution to holders of Common Stock. If any preferred stock is issued, the
holders thereof may have a priority in liquidation or dissolution over the
holders of the Common Stock.
 
  Other Characteristics
 
     Holders of the Common Stock will not have preemptive rights with respect to
any additional shares of Common Stock that may be issued. The Common Stock is
not subject to call for redemption, and the outstanding shares of Common Stock,
when issued and upon receipt by the Company of the full purchase price therefor,
will be fully paid and nonassessable.
 
PREFERRED STOCK
 
     None of the 5,000,000 authorized shares of preferred stock of the Company
will be issued in the Conversion. The Board of Directors of the Company is
authorized, without shareholder approval, to issue preferred stock or rights to
acquire preferred stock, and to fix and state voting powers, designations,
preferences or other special rights of such shares or rights, and the
qualifications, limitations and restrictions thereof. The preferred stock may
rank prior to the Common Stock as to dividend rights or liquidation preferences,
or both, and may have full or limited voting rights. The Board of Directors has
no present intention to issue any of the preferred stock. The Board of Directors
of the Company may consider issuing rights to acquire the Company's preferred
stock to all shareholders pursuant to the adoption of a shareholder rights plan,
should Franklin continue its hostile attempt to acquire control of Mercer
Mutual. Such rights also typically permit, in the event of a hostile takeover
attempt of the issuer, all shareholders, except the hostile acquiror, to acquire
shares of the common stock of the issuer or the acquiror at a price that is
substantially less than the market price. See "Business -- Offer to Acquire
Mercer Mutual" and "-- Legal Proceedings." Should the Board of Directors of the
Company subsequently issue preferred stock or rights to acquire preferred stock,
no holder of any such stock shall have any preemptive right to subscribe for or
purchase any stock or any other securities of the Company other than such, if
any, as the Board of Directors, in its sole discretion, may determine and at
such price or prices and upon such other terms as the Board of Directors, in its
sole discretion, may fix.
 
                          TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Common Stock is Registrar and
Transfer Company, Cranford, New Jersey.
 
                                 LEGAL OPINIONS
 
     The legality of the Common Stock will be passed upon for the Company by
Stevens & Lee, Wayne, Pennsylvania. Stevens & Lee has consented to the reference
herein to its opinion. Certain legal matters will be passed upon for Sandler
O'Neill by Lord, Bissell & Brook, Chicago, Illinois.
 
                                       97
<PAGE>   98
 
                                    EXPERTS
 
     The consolidated financial statements and schedules of Mercer Mutual as of
December 31, 1997 and 1996, and for each of the years in the three-year period
ended December 31, 1997 have been included herein and in the Registration
Statement in reliance upon the reports of KPMG LLP, independent certified public
accountants, appearing elsewhere herein, and upon the authority of said firm as
experts in accounting and auditing.
 
     Sheshunoff has consented to the publication herein of the summary of its
opinion as to the estimated consolidated pro forma aggregate market value of the
Common Stock to be issued in the Conversion and the value of subscription rights
to purchase the Common Stock, and to the use of its name and statements with
respect to it appearing herein.
 
                             AVAILABLE INFORMATION
 
     The Company has filed with the Securities and Exchange Commission ("SEC") a
Registration Statement on Form S-1 under the Securities Act with respect to the
Common Stock offered hereby (the "Registration Statement"). As permitted by the
rules and regulations of the SEC, this prospectus does not contain all the
information set forth in the Registration Statement. Such information and all
exhibits to the Registration Statement, including the Appraisal which is an
exhibit to the Registration Statement, can be examined without charge at the
public reference facilities of the SEC located at Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, and at the SEC's Regional
Offices located at Citicorp Center, 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661, and at Seven World Trade Center, Suite 1300, New York,
New York 10048, and copies of such material can be obtained from the SEC at
prescribed rates.
 
     In addition, copies of such documents may be obtained on the Internet at
http://www.sec.gov.
 
     Mercer Mutual has filed an Application to Convert from Mutual to Stock Form
with the Pennsylvania Department with respect to the Conversion and has received
the Orders approving such application. The application and the Orders may be
examined at the principal office of the Pennsylvania Department located in
Harrisburg, Pennsylvania.
 
     In connection with the Conversion, the Company will register its Common
Stock with the SEC under Section 12(g) of the Exchange Act and, upon such
registration, the Company and the holders of its stock will become subject to
the proxy solicitation rules, the annual and periodic reporting requirements,
the restrictions on stock purchases and sales by directors, officers and greater
than 10% stockholders, and certain other requirements of the Exchange Act. Under
the Plan, the Company has undertaken that it will not terminate such
registration for a period of at least three years following the Conversion.
 
     A copy of the Articles of Incorporation and the Bylaws of the Company and
Mercer Mutual are available without charge from Mercer Mutual.
 
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<PAGE>   99
 
                      GLOSSARY OF SELECTED INSURANCE TERMS
 
Acquisition costs.............   Agents' or brokers' commissions, premium taxes,
                                 marketing, and certain underwriting expenses
                                 associated with the production of business.
 
Assumed reinsurance...........   Insurance or reinsurance transferred from
                                 another insurance or reinsurance entity.
 
Cede..........................   To transfer to an insurer or a reinsurer all or
                                 a part of the insurance or reinsurance written
                                 by an insurance or reinsurance entity.
 
Combined ratio................   The sum of the expense ratio and the loss
                                 ratio, determined either in accordance with
                                 statutory accounting practices or GAAP. A
                                 combined ratio under 100% generally indicates
                                 an underwriting profit and a combined ratio
                                 over 100% generally indicates an underwriting
                                 loss. The extent by which the combined ratio
                                 deviates from 100% indicates relative
                                 underwriting profit or loss.
 
Commercial Multi-peril........   Commercial multi-peril coverage insures against
                                 losses to businesses and business personal
                                 property, such as those caused by fire, wind,
                                 hail, water damage, theft and vandalism, as
                                 well as comprehensive general liability for
                                 injuries to others. Optional coverages written
                                 include inland marine, crime and boiler and
                                 machinery.
 
Direct written premiums.......   Total premiums written by an insurer other than
                                 premiums for reinsurance assumed by an insurer.
 
Earned premiums...............   The portion of net written premiums applicable
                                 to the expired period of policies.
 
Expense ratio.................   Under statutory accounting practices, the ratio
                                 of underwriting expenses to net written
                                 premiums.
 
Fire & Allied Lines...........   Fire and allied lines insurance generally
                                 covers fire, lightning, and removal and
                                 extended coverage.
 
Gross premiums................   Total premiums for insurance written and
                                 reinsurance assumed during a given period.
 
Homeowners....................   Homeowners coverage insures individuals for
                                 losses to their residences and personal
                                 property, such as those caused by fire, wind,
                                 hail, water damage, theft and vandalism, and
                                 against third party liability claims.
 
Incurred losses...............   The sum of losses paid plus the change in the
                                 estimated liability for claims which have been
                                 reported but which have not been settled and
                                 claims which have occurred but have not yet
                                 been reported to the insurer.
 
Inland marine.................   Inland marine coverage insures merchandise or
                                 cargo in transit and business and personal
                                 property. It is also written as an endorsement
                                 to a homeowner's policy to provide coverage for
                                 scheduled property, such as antiques, fine art,
                                 sports equipment, boats, firearms, jewelry and
                                 camera equipment.
 
Loss adjustment expenses......   The expenses of settling claims, including
                                 legal and other fees and the general expenses
                                 of administering the claims adjustment process.
 
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<PAGE>   100
 
Loss and LAE ratio............   Under statutory accounting practices, the ratio
                                 of incurred losses and loss adjustment expenses
                                 to earned premiums.
 
Net earned premiums...........   The portion of written premiums that is
                                 recognized for accounting purposes as revenue
                                 during a period.
 
Net premiums..................   Gross premiums written less premiums ceded to
                                 reinsurers.
 
Net written premiums..........   Gross premiums written and insured by an
                                 insurer less premiums ceded to reinsurers.
 
Probable Maximum Loss.........   The largest loss that a catastrophe will
                                 probably cause under most circumstances. It is
                                 not ordinarily the "maximum possible loss,"
                                 which is the worst possible scenario and which
                                 would, in many cases, be 100% of the property
                                 value. It is a concept used by underwriters,
                                 reinsurers and A.M. Best in evaluating
                                 catastrophe loss potential.
 
Reinsurance...................   A procedure whereby an insurer remits or cedes
                                 a portion of the premiums to another insurer or
                                 reinsurer as payment to that insurer or
                                 reinsurer for assuming a portion of the related
                                 risk.
 
Statutory accounting
practices.....................   Recording transactions and preparing financial
                                 statements in accordance with the rules and
                                 procedures prescribed or permitted by statute
                                 or regulatory authorities, generally reflecting
                                 a liquidating, rather than a going concern,
                                 concept of accounting. The principal
                                 differences between statutory accounting
                                 practices ("SAP") and GAAP for property and
                                 casualty insurance companies, are: (a) under
                                 SAP, certain assets that are not admitted
                                 assets are eliminated from the balance sheet;
                                 (b) under SAP, policy acquisition costs are
                                 expenses as incurred, while under GAAP, they
                                 are deferred and amortized over the term of the
                                 policies; (c) under SAP, no provision is made
                                 for deferred income taxes; (d) under SAP,
                                 certain reserves are recognized that are not
                                 recognized under GAAP; and (e) under SAP, fixed
                                 income securities (bonds, redeemable preferred
                                 stocks and mortgage-backed securities) are
                                 carried at cost, while under GAAP, they are
                                 carried at market value.
 
Statutory surplus.............   The sum remaining after all liabilities are
                                 subtracted from all assets, applying statutory
                                 accounting practices. This sum is regarded as
                                 financial protection to policyholders in the
                                 event an insurance company suffers unexpected
                                 or catastrophic losses.
 
Umbrella policy...............   An insurance policy covering liabilities in
                                 excess of amounts covered under a standard
                                 policy.
 
Underwriting..................   The process whereby an insurer reviews
                                 applications submitted for insurance coverage
                                 and determines whether it will accept all or
                                 part of the coverage being requested and what
                                 the applicable premiums should be. Underwriting
                                 also includes an ongoing review of existing
                                 policies and their pricing.
 
Underwriting expenses.........   The aggregate of policy acquisition costs and
                                 the portion of administrative, general and
                                 other expenses attributable to underwriting
                                 operations.
 
                                       100
<PAGE>   101
 
Underwriting profit (loss)....   The excess (deficiency), determined under
                                 statutory accounting practices, resulting from
                                 the difference between earned premiums and the
                                 sum of incurred losses, loss adjustment
                                 expenses and underwriting expenses.
 
Voluntary market..............   The market consisting of those persons who
                                 insurance companies voluntarily choose to
                                 insure because such companies believe that they
                                 can do so profitably at competitive rates.
 
Workers' Compensation.........   Workers' compensation coverage insures
                                 employers against employee medical and
                                 indemnity claims resulting from injuries
                                 related to work as well as third party
                                 employer's liability.
 
                                       101
<PAGE>   102
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
                                OF MERCER MUTUAL
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
INDEPENDENT AUDITORS' REPORT................................  F-2
CONSOLIDATED FINANCIAL STATEMENTS
      BALANCE SHEETS (As of December 31, 1997 and 1996).....  F-3
      STATEMENTS OF EARNINGS (For the years ended December
       31, 1997, 1996 and 1995).............................  F-4
      STATEMENTS OF CHANGES IN SURPLUS (For the years ended
       December 31, 1997, 1996 and 1995)....................  F-5
      STATEMENTS OF CASH FLOWS (For the years ended December
       31, 1997, 1996 and 1995).............................  F-6
      NOTES TO CONSOLIDATED FINANCIAL STATEMENTS............  F-7
INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)
      BALANCE SHEETS (Unaudited) (As of September 30, 1998
       and December 31, 1997)...............................  F-18
      STATEMENTS OF EARNINGS (Unaudited) (For the nine
       months ended September 30, 1998 and 1997)............  F-19
      STATEMENTS OF CHANGES IN SURPLUS (Unaudited) (For the
       nine months ended September 30, 1998 and 1997).......  F-20
      STATEMENTS OF CASH FLOWS (Unaudited) (For the nine
       months ended September 30, 1998 and 1997)............  F-21
</TABLE>
 
                                       F-1
<PAGE>   103
 
                          INDEPENDENT AUDITORS REPORT
 
The Board of Directors
Mercer Mutual Insurance Company:
 
     We have audited the accompanying consolidated balance sheets of Mercer
Mutual Insurance Company and subsidiaries (the Group) as of December 31, 1997
and 1996, and the related statements of earnings, changes in surplus, and cash
flows for each of the years in the three-year period ended December 31, 1997.
These financial statements are the responsibility of the Group's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of the Group as of
December 31, 1997 and 1996, and the results of their operations and their cash
flows for each of the years in the three-year period ended December 31, 1997, in
conformity with generally accepted accounting principles.
 
                                          KPMG LLP
 
Philadelphia, Pennsylvania
February 18, 1998
 
                                       F-2
<PAGE>   104
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
                           DECEMBER 31, 1997 AND 1996
 
<TABLE>
<CAPTION>
                                                                1997         1996
                                                              ---------    ---------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                           <C>          <C>
                                       ASSETS
Investments, at fair value:
  Fixed income securities, available-for-sale...............   $34,947      $34,964
  Equity securities.........................................    10,852        7,795
     Total investments......................................    45,799       42,759
Cash and cash equivalents...................................     2,707        2,675
Premiums receivable.........................................     3,334        2,308
Reinsurance receivables.....................................    13,206       18,908
Prepaid reinsurance premiums................................     3,046          994
Deferred policy acquisition costs...........................     3,019        2,989
Accrued investment income...................................       625          602
Property and equipment, net.................................     1,413        1,441
Deferred income taxes.......................................        --          802
Other assets................................................       936          596
                                                               -------      -------
     Total assets...........................................   $74,085      $74,074
                                                               =======      =======
 
                              LIABILITIES AND SURPLUS
Liabilities:
  Losses and loss adjustment expenses.......................   $31,872      $35,221
  Unearned premiums.........................................    14,723       13,179
  Accounts payable and accrued expenses.....................     2,417        1,700
  Deferred income taxes.....................................       177           --
  Other reinsurance balances................................       835        4,028
  Other liabilities.........................................       825          664
                                                               -------      -------
     Total liabilities......................................    50,849       54,792
                                                               -------      -------
Surplus:
  Unassigned surplus........................................    20,693       18,476
  Accumulated other comprehensive income:
     Unrealized gains in investments, net of deferred income
      taxes.................................................     2,543          806
                                                               -------      -------
     Total surplus..........................................    23,236       19,282
                                                               -------      -------
     Total liabilities and surplus..........................   $74,085      $74,074
                                                               =======      =======
</TABLE>
 
          See accompanying notes to consolidated financial statements.
                                       F-3
<PAGE>   105
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENTS OF EARNINGS
 
                  YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
<TABLE>
<CAPTION>
                                                               1997       1996       1995
                                                              -------    -------    -------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Revenue:
  Net premiums earned.......................................  $17,969    $20,634    $20,817
  Investment income, net of expenses........................    2,350      2,289      2,132
  Net realized investment gains.............................      589        596         53
  Other revenue.............................................      173        155        161
                                                              -------    -------    -------
     Total revenue..........................................   21,081     23,674     23,163
                                                              -------    -------    -------
Expenses:
  Losses and loss adjustment expenses.......................   10,594     14,801     13,296
  Amortization of deferred policy acquisition costs.........    4,706      5,491      5,944
  Other expenses............................................    2,563      2,571      2,416
                                                              -------    -------    -------
     Total expenses.........................................   17,863     22,863     21,656
                                                              -------    -------    -------
Income before income tax....................................    3,218        811      1,507
Income tax..................................................    1,001        171        369
                                                              -------    -------    -------
Net income..................................................  $ 2,217    $   640    $ 1,138
                                                              =======    =======    =======
</TABLE>
 
          See accompanying notes to consolidated financial statements.
                                       F-4
<PAGE>   106
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                 CONSOLIDATED STATEMENTS OF CHANGES IN SURPLUS
 
                  YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
<TABLE>
<CAPTION>
                                                               1997       1996       1995
                                                              -------    -------    -------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Balance, beginning of period................................  $19,282    $18,963    $14,203
Net income..................................................    2,217        640      1,138
Other comprehensive income, net of tax:
  Unrealized gains on securities:
     Unrealized holding gains arising during period (net of
       related income tax expense of $1,095, $37 and
       $1,884)..............................................    2,126         72      3,657
  Less:
     Reclassification adjustment for gains included in net
       income (net of related income tax expense of $200,
       $203 and $18)........................................     (389)      (393)       (35)
                                                              -------    -------    -------
     Total..................................................    1,737       (321)     3,622
                                                              -------    -------    -------
  Comprehensive income......................................    3,954        319      4,760
                                                              -------    -------    -------
Balance, end of period......................................  $23,236    $19,282    $18,963
                                                              =======    =======    =======
</TABLE>
 
          See accompanying notes to consolidated financial statements.
                                       F-5
<PAGE>   107
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENTS OF CASH FLOW
 
                  YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
<TABLE>
<CAPTION>
                                                               1997       1996        1995
                                                              -------    -------    --------
                                                                  (DOLLARS IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Cash flows from operating activities:
  Net income................................................  $ 2,217    $   640    $  1,138
  Adjustments to reconcile net income to net cash provided
     by operating activities:
     Depreciation of property and equipment.................      117        137         134
     Net accretion of discount..............................      (51)       (58)        (54)
     Net realized investment gain...........................     (589)      (596)        (53)
     Net realized gain on sale of property and equipment....       --          3          --
     Deferred income tax....................................       83       (120)        (55)
     Change in assets and liabilities:
       Premiums receivable..................................   (1,026)     2,345        (286)
       Reinsurance receivables..............................    5,702     (2,019)        368
       Prepaid reinsurance premiums.........................   (2,052)     4,564         (55)
       Deferred policy acquisition costs....................      (30)       167         174
       Other assets.........................................     (363)        98         724
       Losses and loss expenses.............................   (3,349)      (955)        645
       Unearned premiums....................................    1,544     (5,074)        483
       Other liabilities....................................   (2,355)     2,300        (214)
                                                              -------    -------    --------
          Net cash provided by (used in) operating
            activities......................................     (152)     1,432       2,949
                                                              -------    -------    --------
Cash flows from investing activities:
  Purchase of fixed income securities, available-for-sale...   (7,747)    (6,477)    (15,118)
  Purchase of equity securities.............................   (7,477)    (6,938)     (5,891)
  Sale and maturity of fixed income securities
     available-for-sale.....................................    8,368      4,294      10,146
  Sale of equity securities, available for sale.............    7,089      6,983       9,412
  Change in receivable/payable of securities................       40        (39)         99
  Purchase of property and equipment........................      (89)      (176)        (92)
  Sale of property and equipment............................       --         29          --
                                                              -------    -------    --------
     Net cash used in investing activities..................      184     (2,324)     (1,444)
                                                              -------    -------    --------
     Net increase (decrease) in cash and cash equivalents...       32       (892)      1,505
Cash and cash equivalents at beginning of year..............    2,675      3,567       2,062
                                                              -------    -------    --------
Cash and cash equivalents at end of period..................  $ 2,707    $ 2,675    $  3,567
                                                              =======    =======    ========
Cash paid during the year for:
  Interest..................................................  $     0    $     0    $      0
  Income taxes..............................................  $   730    $   125    $    281
</TABLE>
 
          See accompanying notes to consolidated financial statements.
                                       F-6
<PAGE>   108
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                             (DOLLARS IN THOUSANDS)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Description of Business
 
     Mercer Mutual Insurance Company (MMIC), its subsidiary Queenstown Holding
Company, Inc. (QHC) and QHC's subsidiary Mercer Insurance Company (MIC)
collectively referred herein as the "Group", provide property and casualty
insurance to both individual and commercial customers in New Jersey and
Pennsylvania. The principal lines of business are homeowners, commercial
multi-peril, general liability and fire and allied which represent approximately
46%, 22%, 13% and 10%, respectively, of net premiums written in 1997.
 
     MMIC has filed an application with the Insurance Department of the
Commonwealth of Pennsylvania to form of an insurance holding company,
incorporated in Pennsylvania, to purchase all of the authorized stock of MMIC,
which plans to convert from the mutual to the stock form of organization.
 
  Consolidation Policy and Basis of Presentation
 
     The consolidated financial statements include the accounts of each member
of the Group. All significant intercompany accounts and transactions have been
eliminated in consolidation. The consolidated financial statements have been
prepared in conformity with generally accepted accounting principles, which
differ in some respects from those followed in reports to insurance regulatory
authorities.
 
  Use of Estimates
 
     The preparation of the accompanying financial statements requires
management to make estimates and assumptions that affect the reported amounts of
assets and liabilities and disclosure of contingent assets and liabilities at
the date of the financial statements and the reported amounts of revenues and
expenses during the reporting period. Actual results could differ from those
estimates.
 
  Investments
 
     Due to periodic shifts in the portfolio arising out of income tax and
asset-liability matching, as well as securities markets and economic factors,
management considers the entire portfolio of fixed income securities as
available-for-sale. Fixed income securities available-for-sale and equity
securities are stated at fair value with changes in fair value, net of deferred
income tax, reflected in surplus. Realized gains and losses are calculated on
the specific identification basis.
 
     Interest on fixed maturities is credited to income as it accrues on the
principal amounts outstanding, adjusted for amortization of premiums and
accretion of discounts computed utilizing the effective interest rate method.
Premiums and discounts on mortgage-backed securities are amortized using
anticipated prepayments with significant changes in anticipated prepayments
accounted for prospectively.
 
  Cash and cash equivalents
 
     Cash and cash equivalents are carried at cost which approximates market
value. The Group considers all highly liquid investments with a maturity of
three months or less when purchased to be cash equivalents.
 
  Fair Values of Financial Instruments
 
     The Group has used the following methods and assumptions in estimating its
fair values:
 
     Investments -- The fair values for fixed income securities
available-for-sale are based on quoted market prices, when available. If not
available, fair values are based on values obtained from investment brokers.
Fair
 
                                       F-7
<PAGE>   109
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
values for marketable equity securities are based on quoted market prices and on
statutory equity for the security indicated below.
 
     The fair value of an equity security in a reinsurance company is estimated
based on statutory book value because the security is not traded and because of
restrictions placed on the investors. After receipt of a bona fide offer to
purchase this security, the stock must first be offered to the investee or its
other shareholders at the lower of statutory book value or the offered price.
The investee also has the ability to determine that the potential purchaser is
not appropriate and void such an offer.
 
     Cash and cash equivalents -- The carrying amounts reported in the balance
sheet for these instruments approximate their fair values.
 
     Premium and reinsurance receivables -- The carrying amounts reported in the
balance sheet for these instruments approximate their fair values.
 
  Reinsurance
 
     The Group cedes insurance to, and assumes insurance from, unrelated
insurers to limit its maximum loss exposure through risk diversification. Ceded
reinsurance receivables and unearned premiums are reported as assets; loss and
loss adjustment expenses are reported gross of ceded reinsurance credits.
 
  Deferred Policy Acquisition Costs
 
     Acquisition costs such as commissions, premium taxes and certain other
expenses which vary with and are directly related to the production of business,
are deferred and amortized over the effective period of the related insurance
policies. The method followed in computing deferred policy acquisition costs
limits the amount of such deferred costs to their estimated realizable value,
which gives effect to premiums to be earned, loss and loss adjustment expenses
and certain other maintenance costs expected to be incurred as the premiums are
earned. To the extent that deferred policy acquisition costs are not realizable,
the deficiency is charged to income currently.
 
  Property and Equipment
 
     Property and equipment are carried at cost less accumulated depreciation
calculated on the straight-line basis. Property is depreciated over useful lives
ranging from five to forty-five years. Equipment is depreciated three to ten
years.
 
  Premium Revenue
 
     Premiums include direct writings plus reinsurance assumed less reinsurance
ceded to other insurers and are recognized as revenue over the period that
coverage is provided using the monthly pro-rata method. Unearned premiums
represent that portion of premiums written that are applicable to the unexpired
terms of policies in force.
 
  Losses and Loss Adjustment Expenses
 
     The liability for losses includes the amount of claims which have been
reported to the Company and are unpaid at the statement date as well as
provision for claims incurred but not reported, after deducting anticipated
salvage and subrogation. The liability for loss adjustment expenses is
determined as a percentage of the liability for losses based on the historical
ratio of paid adjustment expenses to paid losses by line of business.
 
     Management believes that the liabilities for losses and loss adjustment
expenses at December 31, 1997 are adequate to cover the ultimate net cost of
losses and claims to date, but these liabilities are necessarily
 
                                       F-8
<PAGE>   110
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
based on estimates, and the amount of losses and loss adjustment expenses
ultimately paid may be more or less than such estimates.
 
  Income Taxes
 
     The Group uses the asset and liability method of accounting for income
taxes. Deferred income taxes arise from the recognition of temporary differences
between financial statement carrying amounts and the tax bases of the Group's
assets and liabilities. A valuation allowance is provided when it is more likely
than not that some portion of the deferred tax asset will not be realized. The
effect of a change in tax rates is recognized in the period of the enactment
date.
 
(2)  INVESTMENTS
 
     Net investment income, net realized investment gains and change in
unrealized capital gains (losses) on investment securities are as follows:
 
<TABLE>
<CAPTION>
                                                            1997      1996      1995
                                                           ------    ------    ------
                                                             (DOLLARS IN THOUSANDS)
<S>                                                        <C>       <C>       <C>
Investment income:
  Fixed income securities..............................    $2,379    $2,326    $2,068
  Equity securities....................................       192       153       168
  Cash and cash equivalents............................       118       143       194
  Other................................................        41        46        54
                                                           ------    ------    ------
     Gross investment income...........................     2,730     2,668     2,484
Less investment expenses(1)............................       380       379       352
                                                           ------    ------    ------
     Net investment income.............................     2,350     2,289     2,132
Realized gains (losses):
  Fixed income securities..............................       (78)      (21)     (173)
  Equity securities....................................       667       617       226
                                                           ------    ------    ------
     Net realized investment gains.....................       589       596        53
                                                           ------    ------    ------
     Net investment income and net realized investment
       gains...........................................    $2,939    $2,885    $2,185
                                                           ======    ======    ======
</TABLE>
 
     Change in unrealized gains (losses) of securities, net of tax, are as
follows:
 
<TABLE>
<CAPTION>
                                                             1997     1996      1995
                                                            ------    -----    ------
<S>                                                         <C>       <C>      <C>
Fixed income securities.................................    $  417    $(576)   $1,987
Equity securities.......................................     1,320      255     1,635
                                                            ------    -----    ------
                                                            $1,737    $(321)   $3,622
                                                            ======    =====    ======
</TABLE>
 
- ---------------
(1) Investment expenses include salaries, counseling fees and other
    miscellaneous expenses attributable to the maintenance of investment
    activities.
 
                                       F-9
<PAGE>   111
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The cost and estimated fair value of available-for-sale investment
securities at December 31, 1997 and 1996 are shown below.
 
<TABLE>
<CAPTION>
                                                                 GROSS         GROSS       ESTIMATED
                                                               UNREALIZED    UNREALIZED      FAIR
1997                                                COST(1)      GAINS         LOSSES        VALUE
- ----                                                -------    ----------    ----------    ---------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                                 <C>        <C>           <C>           <C>
Fixed income securities, available-for-sale
  U.S. Government and government agencies.........  $25,195      $  266         $ 54        $25,407
  Obligations of states and political
     subdivisions.................................  $ 3,396      $  121         $ --        $ 3,517
  Industrial and miscellaneous....................  $   300      $    1         $  1        $   300
  Mortgage-backed securities......................  $ 6,106      $   10         $393        $ 5,723
                                                    -------      ------         ----        -------
Total fixed maturities............................  $34,997      $  398         $448        $34,947
                                                    -------      ------         ----        -------
Equity securities:
  At market value.................................  $ 6,854      $2,664         $104        $ 9,414
  At estimated value..............................  $    94      $1,344         $ --        $ 1,438
                                                    -------      ------         ----        -------
Total equity securities...........................  $ 6,948      $4,008         $104        $10,852
                                                    -------      ------         ----        -------
Total available-for-sale..........................  $41,945      $4,406         $552        $45,799
                                                    =======      ======         ====        =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 GROSS         GROSS       ESTIMATED
                                                               UNREALIZED    UNREALIZED      FAIR
                       1996                         COST(1)      GAINS         LOSSES        VALUE
                       ----                         -------    ----------    ----------    ---------
<S>                                                 <C>        <C>           <C>           <C>
Fixed income securities, available-for-sale
U.S. Government and government agencies...........  $23,702      $  223        $  234       $23,691
  Obligations of states and political
     subdivisions.................................    4,313          48            18         4,343
  Mortgage-backed securities......................    7,631          12           713         6,930
                                                    -------      ------        ------       -------
Total fixed maturities............................   35,646         283           965        34,964
                                                    -------      ------        ------       -------
Equity securities:
  At market value.................................    5,892       1,119           329         6,682
  At estimated value..............................       --       1,113            --         1,113
                                                    -------      ------        ------       -------
Total equity securities...........................    5,892       2,232           329         7,795
                                                    -------      ------        ------       -------
Total available-for-sale..........................  $41,538      $2,515        $1,294       $42,759
                                                    =======      ======        ======       =======
</TABLE>
 
- ---------------
(1) Original cost of equity securities; original cost of fixed income securities
    adjusted for amortization of premium and accretion of discount.
 
                                      F-10
<PAGE>   112
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The amortized cost and estimated fair value of fixed income securities at
December 31, 1997, by contractual maturity, are shown below. Expected maturities
may differ from contractual maturities because borrowers may have the right to
call or prepay obligations with or without call or prepayment penalties.
 
<TABLE>
<CAPTION>
                                                          AMORTIZED    ESTIMATED
                                                            COST       FAIR VALUE
                                                          ---------    ----------
                                                          (DOLLARS IN THOUSANDS)
<S>                                                       <C>          <C>
Due after one year through five years...................   $ 1,361      $ 1,496
Due after five years through ten years..................    25,251       25,470
Due after ten years.....................................     2,279        2,258
                                                           -------      -------
                                                            28,891       29,224
Mortgage backed securities..............................     6,106        5,723
                                                           -------      -------
                                                           $34,997      $34,947
                                                           =======      =======
</TABLE>
 
     The gross realized gains and losses on investment securities are as
follows:
 
<TABLE>
<CAPTION>
                                                             1997     1996     1995
                                                            ------    -----    -----
                                                             (DOLLARS IN THOUSANDS)
<S>                                                         <C>       <C>      <C>
Gross realized gains......................................  $1,027    $ 921    $ 778
Gross realized losses.....................................    (438)    (325)    (725)
                                                            ------    -----    -----
                                                            $  589    $ 596    $  53
                                                            ======    =====    =====
</TABLE>
 
     Proceeds from the sale of available-for-sale securities were $15,457,
$11,276 and $19,032 for 1997, 1996 and 1995, respectively.
 
(3) DEFERRED POLICY ACQUISITION COSTS
 
     Changes in deferred policy acquisition costs are as follows:
 
<TABLE>
<CAPTION>
                                                         1997       1996       1995
                                                        -------    -------    -------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Balance, January 1....................................  $ 2,989    $ 3,155    $ 3,330
Acquisition costs deferred............................    4,736      5,325      5,769
Amortization charged to earnings......................   (4,706)    (5,491)    (5,944)
                                                        -------    -------    -------
Balance, December 31..................................  $ 3,019    $ 2,989    $ 3,155
                                                        =======    =======    =======
</TABLE>
 
(4) PROPERTY AND EQUIPMENT
 
     Property and equipment was as follows:
 
<TABLE>
<CAPTION>
                                                                1997         1996
                                                              ---------    ---------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                           <C>          <C>
Home Office:
  Land......................................................   $   456      $   456
  Buildings and improvements................................     1,479        1,468
  Furniture, fixtures and equipment.........................     1,368        1,290
                                                               -------      -------
                                                                 3,303        3,214
  Accumulated depreciation..................................    (1,890)      (1,773)
                                                               -------      -------
                                                               $ 1,413      $ 1,441
                                                               =======      =======
</TABLE>
 
                                      F-11
<PAGE>   113
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
(5) LIABILITIES FOR LOSSES AND LOSS ADJUSTMENT EXPENSES
 
     Activity in the liabilities for losses and loss adjustment expenses is
summarized as follows:
 
<TABLE>
<CAPTION>
                                                       1997        1996        1995
                                                     --------    --------    --------
                                                          (DOLLARS IN THOUSANDS)
<S>                                                  <C>         <C>         <C>
Balance, January 1.................................  $ 35,221    $ 36,176    $ 35,531
  Less reinsurance recoverable on unpaid losses and
     loss expenses.................................   (15,147)    (16,819)    (17,233)
                                                     --------    --------    --------
Net balance at January 1...........................    20,074      19,357      18,298
Incurred related to:
  Current year.....................................    11,649      16,445      14,251
  Prior years......................................    (1,055)     (1,644)       (955)
                                                     --------    --------    --------
Total incurred.....................................    10,594      14,801      13,296
                                                     --------    --------    --------
Paid related to:
  Current year.....................................     4,775       7,715       5,302
  Prior years......................................     6,042       6,369       6,935
Total paid.........................................    10,817      14,084      12,237
                                                     --------    --------    --------
Net balance, December 31...........................    19,851      20,074      19,357
  Plus reinsurance recoverable on unpaid losses and
     loss expenses.................................    12,021      15,147      16,819
                                                     --------    --------    --------
Balance at December 31.............................  $ 31,872    $ 35,221    $ 36,176
                                                     ========    ========    ========
</TABLE>
 
     The Group has geographic exposure to catastrophe losses in its operating
region. Catastrophes can be caused by various events including hurricanes,
windstorms, earthquakes, hail, explosion, severe weather and fire. The incidence
and severity of catastrophes are inherently unpredictable. The extent of losses
from a catastrophe is a functions of both the total amount of insured exposure
in the area affected by the event and the severity of the event. Most
catastrophes are restricted to small geographic areas. However, hurricanes and
earthquakes may produce significant damage in large, heavily populated areas.
The Group generally seeks to reduce its exposure to catastrophe through
individual risk selection and the purchase of catastrophe reinsurance.
 
(6) REINSURANCE
 
     In the ordinary course of business, the Company seeks to limit its exposure
to loss on individual claims and from the effects of catastrophes by entering
into reinsurance contracts with other insurance companies. Reinsurance is ceded
on excess of loss and pro-rata bases with the Company's retention not exceeding
$100,000 per occurrence. Insurance ceded by the Company does not relieve its
primary liability as the originating insurer. The Company also assumes
reinsurance from other companies on a pro-rata basis.
 
     The effect of reinsurance with unrelated insurers on premiums written and
earned is as follows:
 
<TABLE>
<CAPTION>
                                                        1997       1996        1995
                                                      --------    -------    --------
                                                          (DOLLARS IN THOUSANDS)
<S>                                                   <C>         <C>        <C>
PREMIUMS WRITTEN
Direct............................................    $ 28,453    $24,958    $ 24,699
Assumed...........................................         547      5,013      10,287
Ceded.............................................     (11,539)    (9,847)    (13,741)
                                                      --------    -------    --------
Net...............................................    $ 17,461    $20,124    $ 21,245
                                                      ========    =======    ========
</TABLE>
 
                                      F-12
<PAGE>   114
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                       1997        1996        1995
                                                      -------    --------    --------
<S>                                                   <C>        <C>         <C>
PREMIUMS EARNED
Direct............................................    $26,858    $ 24,760    $ 24,700
Assumed...........................................        598      10,286       9,803
Ceded.............................................     (9,487)    (14,412)    (13,686)
                                                      -------    --------    --------
Net...............................................    $17,969    $ 20,634    $ 20,817
                                                      =======    ========    ========
</TABLE>
 
     The effect of reinsurance on unearned premiums as of December 31, 1997,
1996 and 1995 is as follows:
 
<TABLE>
<CAPTION>
                                                         1997       1996       1995
                                                        -------    -------    -------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Direct..............................................    $14,552    $12,957    $12,759
Assumed.............................................        171        222      5,494
                                                        -------    -------    -------
Net.................................................    $14,723    $13,179    $18,253
                                                        =======    =======    =======
</TABLE>
 
     The effect of reinsurance on the liabilities for losses and loss adjustment
and losses and loss adjustment expenses incurred is as follows:
 
<TABLE>
<CAPTION>
                                                         1997       1996       1995
                                                        -------    -------    -------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Liabilities
Direct..............................................    $27,068    $27,429    $27,906
Assumed.............................................      4,804      7,792      8,270
                                                        -------    -------    -------
                                                        $31,872    $35,221    $36,176
                                                        =======    =======    =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                         1997       1996       1995
                                                        -------    -------    -------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Expenses Incurred
Direct..............................................    $11,743    $14,597    $13,120
Assumed.............................................        301      7,234      6,694
Ceded...............................................     (1,450)    (7,030)    (6,518)
                                                        -------    -------    -------
Net.................................................    $10,594    $14,801    $13,296
                                                        =======    =======    =======
</TABLE>
 
     The Group performs credit reviews of its reinsurers, focusing on financial
stability. To the extent that a reinsurer may be unable to pay losses for which
it is liable under the terms of a reinsurance agreement, the Group is exposed to
the risk of continued liability for such losses. At December 31, 1997, three
independent reinsurers accounted for approximately $4,867 of amounts recoverable
for paid losses and loss adjustment expenses.
 
     Effective December 31, 1996, the Group terminated its participation in
certain ceded and assumed reinsurance agreements. As a result of the termination
of these agreements, premiums unearned as of December 31, 1996 were returned to
the ceding companies, less commission. The Group, as a ceding reinsured,
received back from reinsurers $4,895 in unearned premium less $1,224 in
commission. The Group, as an assuming reinsurer, returned to reinsureds $5,508
in unearned premium less $1,377 in commission. Ceded loss and loss adjustment
reserves attributable to these agreements were $5,669 at December 31, 1996, and
assumed loss and loss adjustment reserves attributable to these agreements were
$6,016 at December 31, 1996.
 
                                      F-13
<PAGE>   115
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
(7)  RETIREMENT PLANS AND DEFERRED DIRECTORS' FEES
 
     Effective January 1, 1997, the Company implemented a defined contribution
pension plan to replace a defined benefit pension plan. The plan covers
substantially all of its employees. Benefits are based on years of service and
the employee's annual compensation. Pension expense from the defined
contribution plan in 1997 amounted to $95.
 
     Benefits under the defined benefit pension plan ceased accruing to
participants as of December 31, 1996. Benefits were based on years of service
and the employee's career-average annual compensation. The Group's funding
policy was to contribute annually at least the minimum required contribution in
accordance with minimum funding standards established by ERISA. Contributions
were intended to provide not only for benefits attributed to service to date,
but also for those expected to be earned in the future. As a result of the
termination of the defined benefit pension plan, the Group incurred a loss of
$173. In December 1997, the Group completed distribution of all benefits. Plan
assets were sufficient to discharge all obligations without further expense
attributable to the defined benefit pension plan.
 
     Plan assets were generally invested in fixed income and equity securities.
The following table sets forth the year-end funded status of the terminated
defined benefit pension plan:
 
<TABLE>
<CAPTION>
                                                              1996
                                                             -------
<S>                                                          <C>
Actuarial present value of benefit obligations:
  Accumulated and projected benefit obligation, including
     vested benefits of $1,009.............................  $(1,021)
Plan assets at fair value..................................      862
Excess of the projected benefit obligation over plan.......     (159)
</TABLE>
 
     The net periodic pension cost for the terminated defined benefit pension
plan included the following components:
 
<TABLE>
<CAPTION>
                                                              1996     1995
                                                              -----    -----
<S>                                                           <C>      <C>
Service costs -- benefits earned during the period..........  $ 119    $  98
Interest cost on projected benefit obligation...............     95       81
Return on plan assets.......................................   (120)     (56)
Net amortization and deferral...............................     62        7
                                                              -----    -----
Net periodic pension cost...................................  $ 156    $ 130
                                                              =====    =====
</TABLE>
 
     In determining the actuarial present value of the projected benefit
obligation, the weighted-average discount rate was 7.5% and 7.25% for 1996 and
1995, respectively. The rate of increase in future compensation levels was 4.5%.
The expected long-term rate of return on retirement plan assets was 8.0%.
 
     The Group also maintains a 401(k) retirement savings plan covering
substantially all employees. The Group matches a percentage of each employees'
pre-tax contribution and also contributes an amount equal to 2% of each
employee's annual compensation. The cost of this plan amounted to $57, $58 and
$56 for the years ended December 31, 1997, 1996 and 1995, respectively.
 
     The Group maintains a non-qualified unfunded retirement plan for its
directors. The plan provides for monthly payments for 10 years upon retirement.
The expense for this plan amounted to $57, $55 and $52 for 1997, 1996 and 1995,
respectively. Costs accrued under this plan amounted to $306 and $249 at
December 31, 1997 and 1996, respectively.
 
     The Group maintains a deferred directors' compensation plan. Under the
plan, a director may elect to defer receipt of all or a portion of their fees.
Amounts deferred, together with accumulated interest, are
 
                                      F-14
<PAGE>   116
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
distributed either as a lump sum or in installments over a period of not greater
than ten years. Deferred directors' fees and accumulated interest amounted to
$549 and $476 at December 31, 1997 and 1996, respectively.
 
(8) FEDERAL INCOME TAXES
 
     The tax effect of significant temporary differences that give rise to the
Group's net deferred tax asset (liability) as of December 31, is as follows:
 
<TABLE>
<CAPTION>
                                                             1997          1996
                                                           ---------     ---------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                        <C>           <C>
Net loss reserve discounting.............................   $ 1,173       $ 1,181
Net unearned premiums....................................       794           828
Unrealized loss on investments...........................       188           440
Other....................................................       272           298
                                                            -------       -------
  Deferred tax assets....................................     2,427         2,747
                                                            -------       -------
Deferred policy acquisition costs........................     1,027         1,016
Unrealized gain on investment............................     1,498           855
Other....................................................        79            74
                                                            -------       -------
  Deferred tax liabilities...............................     2,604         1,945
                                                            -------       -------
  Net deferred tax asset (liability).....................   $  (177)      $   802
                                                            =======       =======
</TABLE>
 
     The deferred tax asset has not been reduced by a valuation allowance
because management believes that, while it is not assured, it is more likely
than not that it will generate sufficient future taxable income to utilize these
net excess tax deductions. The amount of the deferred tax asset considered
realizable, however, could be materially reduced in the near term if estimates
of future taxable income in the years in which the differences are expected to
reverse are not realized.
 
     Actual income tax expense differed from expected tax expense, computed by
applying the United States federal corporate tax rate of 34% to income before
income taxes, for each of the three years ended December 31 as follows:
 
<TABLE>
<CAPTION>
                                                              1997     1996     1995
                                                             ------    ----    ------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                          <C>       <C>     <C>
Expected tax expense.......................................  $1,094    $276    $  513
Tax-exempt interest........................................     (56)    (73)     (107)
Dividends received deduction...............................     (28)    (25)      (35)
Other......................................................      (9)     (7)       (2)
                                                             ------    ----    ------
  Income tax expense.......................................  $1,001    $171    $  369
                                                             ======    ====    ======
</TABLE>
 
     The components of the provision for income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                              1997     1996     1995
                                                             ------    ----    ------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                          <C>       <C>     <C>
Current....................................................  $  918    $291    $  424
Deferred...................................................      83    (120)      (55)
                                                             ------    ----    ------
  Income tax expense.......................................  $1,001    $171    $  369
                                                             ======    ====    ======
</TABLE>
 
                                      F-15
<PAGE>   117
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
(9) RECONCILIATION OF STATUTORY FILINGS TO AMOUNTS REPORTED HEREIN
 
     A reconciliation of the Group's statutory net income and surplus to the
Group's net income and surplus, under generally accepted accounting principles
(GAAP), is as follows:
 
<TABLE>
<CAPTION>
                        NET INCOME:                           1997     1996     1995
                        -----------                          ------    ----    ------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                          <C>       <C>     <C>
Statutory net income.......................................  $2,129    $809    $1,219
Deferred policy acquisition................................      30    (167)     (174)
Deferred federal income taxes..............................     (83)    120        55
Pension....................................................     116    (129)       24
Other......................................................      25       7        14
                                                             ------    ----    ------
GAAP net income............................................  $2,217    $640    $1,138
                                                             ======    ====    ======
</TABLE>
 
<TABLE>
<CAPTION>
                       SURPLUS:                          1997       1996       1995
                       --------                         -------    -------    -------
                                                           (DOLLARS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Statutory surplus.....................................  $20,132    $16,087    $14,938
Deferred policy acquisition...........................    3,019      2,989      3,155
Deferred federal income taxes.........................     (177)       802        516
Non-admitted assets...................................      177        185        192
Unrealized gain (loss) on fixed income securities.....      (50)      (682)       192
Other.................................................      135        (99)       (30)
                                                        -------    -------    -------
GAAP surplus..........................................  $23,236    $19,282    $18,963
                                                        =======    =======    =======
</TABLE>
 
     The Group's insurance companies are required to file statutory financial
statements with various state insurance regulatory authorities. Statutory
financial statements are prepared in accordance with accounting principles and
practices prescribed or permitted by the various states of domicile. Prescribed
statutory accounting practices include state laws, regulations, and general
administrative rules, as well as a variety of publications of the National
Association of Insurance Commissioners (NAIC). Permitted statutory accounting
practices encompass all accounting practices that are not prescribed; such
practices differ from state to state, may differ from company to company within
a state, and may change in the future. Furthermore, the NAIC has a project to
codify statutory accounting practices, the result of which is expected to
constitute the only source of "prescribed" statutory accounting practices.
Accordingly, that project will likely change the definitions of what comprise
prescribed versus permitted statutory accounting practices, and may result in
changes to the accounting policies that insurance enterprises use to prepare
their statutory financial statements. The effects of any such changes are not
presently determinable and will not likely affect financial statements prepared
under generally accepted accounting principles.
 
(10) DEMUTUALIZATION
 
     In October 1997 the Group's Boards of Directors approved a plan of
conversion for changing the corporate form of MMIC from the mutual form to the
stock form (demutualization). Under the plan, policyholders and certain other
groups will have the opportunity to acquire stock in a newly formed holding
company, Mercer Insurance Group, Inc. (MRCR).
 
     MRCR will in turn acquire all of the newly issued stock of MMIC upon
conversion. Prior to the conversion, MRCR will not engage in any significant
operations and will have no assets or liabilities. The demutualization plan is
subject to approval from the Pennsylvania Insurance Department and ultimately
receipt of sufficient stock subscriptions to effect the transaction. The Group
has requested a ruling from the Internal Revenue Service regarding the tax
treatment of the demutualization as a tax-free reorganization. In
 
                                      F-16
<PAGE>   118
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
the event that the plan is executed, the converted companies will be subject to
certain insurance laws and regulations specific to stock insurance companies as
well as regulations of the Securities and Exchange Commission. Limitations on
the payment of dividends and Insurance Holding Company regulations are among the
types of regulatory requirements with which the Group will have to comply.
Assuming the conversion were complete as of December 31, 1997, dividends and
other distributions in 1997 to MRCR from MMIC would be limited to approximately
$2,000 without prior approval of the Insurance Department.
 
(11) FAIR AUTOMOBILE INSURANCE REFORM ACT OF 1990
 
     The Fair Automobile Insurance Reform Act of 1990 (FAIRA) substantially
reformed various aspects of the State of New Jersey s motor vehicle system. As a
result of this legislation, the Group has paid $410, $420 and $467 in 1997, 1996
and 1995, respectively, as its share of the funding of the New Jersey Full
Insurance Underwriting Association (the JUA). The amounts represent the sixth,
seventh and eighth installments of eight to be paid toward funding the JUA. Such
amounts are based on the premiums written in New Jersey.
 
                                      F-17
<PAGE>   119
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
                 AS OF SEPTEMBER 30, 1998 AND DECEMBER 31, 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              SEPTEMBER 30,    DECEMBER 31,
                                                                  1998             1997
                                                              -------------    ------------
                                                               (UNAUDITED)
<S>                                                           <C>              <C>
                           ASSETS
Investments, at fair value:
  Fixed income securities, available-for-sale...............     $36,074         $34,947
  Equity securities.........................................      12,867          10,852
                                                                 -------         -------
     Total investments......................................      48,941          45,799
Cash and cash equivalents...................................       7,035           2,707
Premiums receivable.........................................       3,688           3,334
Reinsurance receivables.....................................       9,297          13,206
Prepaid reinsurance Premiums................................         479           3,046
Deferred policy acquisition costs...........................       3,906           3,019
Accrued investment income...................................         443             625
Property and equipment, net.................................       1,512           1,413
Other assets................................................       1,418             936
                                                                 -------         -------
     Total assets...........................................     $76,719         $74,085
                                                                 -------         -------
                  LIABILITIES AND SURPLUS
Liabilities:
  Losses and loss adjustment expenses.......................     $30,331         $31,872
  Unearned premiums.........................................      15,780          14,723
  Accounts payable and accrued expenses.....................       2,820           2,417
  Deferred income taxes.....................................         310             177
  Other reinsurance balances................................         886             835
  Other liabilities.........................................         756             825
                                                                 -------         -------
     Total liabilities......................................      50,883          50,849
                                                                 -------         -------
Surplus:
  Unassigned surplus........................................      22,655          20,693
  Accumulated other comprehensive income:
     Unrealized gains in investments, net of deferred income
      taxes.................................................       3,181           2,543
                                                                 -------         -------
     Total surplus..........................................      25,836          23,236
                                                                 -------         -------
     Total liabilities and surplus..........................     $76,719         $74,085
                                                                 =======         =======
</TABLE>
 
                                      F-18
<PAGE>   120
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                       CONSOLIDATED STATEMENT OF EARNINGS
                 NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                               1998         1997
                                                              -------      -------
                                                                  (UNAUDITED)
<S>                                                           <C>          <C>
Revenue:
  Net premiums earned.......................................  $17,110      $13,288
  Investment income, net of expenses........................    1,656        1,793
  Net realized investment gains.............................      368          483
  Other revenue.............................................      124          144
                                                              -------      -------
          Total revenue.....................................   19,258       15,708
                                                              -------      -------
Expenses:
  Losses and loss adjustment expenses.......................    8,739        8,038
  Amortization of deferred policy acquisition costs.........    4,836        3,533
  Other expenses............................................    2,755        1,928
                                                              -------      -------
          Total expenses....................................   16,330       13,499
                                                              -------      -------
Income before income tax....................................    2,928        2,209
Income tax..................................................      966          694
                                                              -------      -------
Net income..................................................  $ 1,962      $ 1,515
                                                              -------      -------
</TABLE>
 
                                      F-19
<PAGE>   121
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                  CONSOLIDATED STATEMENT OF CHANGES IN SURPLUS
                 NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                               1998       1997
                                                              -------    -------
                                                                 (UNAUDITED)
<S>                                                           <C>        <C>
Balance, beginning of period................................  $23,236    $19,282
Net income..................................................    1,962      1,515
Other comprehensive income, net of tax:
  Unrealized gains on securities:
     Unrealized holding gains arising during period (net of
      related income tax expense of $453, and $750).........      880      1,468
     Less:
       Reclassification adjustment for gains included in net
        income (net of related income tax expense of $125
        and $164)...........................................     (242)      (319)
                                                              -------    -------
                                                                  638      1,149
                                                              -------    -------
  Comprehensive income......................................    2,600      2,664
                                                              -------    -------
Balance, end of period......................................  $25,836    $21,946
                                                              -------    -------
</TABLE>
 
                                      F-20
<PAGE>   122
 
                MERCER MUTUAL INSURANCE COMPANY AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENT OF CASH FLOW
                 NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                1998       1997
                                                              --------    -------
                                                                  (UNAUDITED)
<S>                                                           <C>         <C>
Cash flows from operating activities:
  Net income................................................  $  1,962    $ 1,515
  Adjustments to reconcile net income to net cash provided
     by (used in) operating activities:
     Depreciation of property and equipment.................       104         84
     Net accretion of discount..............................       (29)       (39)
     Net realized investment gain...........................      (367)      (483)
     Deferred income tax....................................      (195)       (22)
     Change in assets and liabilities:
       Premiums receivable..................................      (354)    (1,139)
       Reinsurance receivables..............................     3,909      5,020
       Prepaid reinsurance premiums.........................     2,567     (2,002)
       Deferred policy acquisition costs....................      (886)        81
       Other assets.........................................      (301)       290
       Losses and loss expenses.............................    (1,541)    (2,409)
       Unearned premiums....................................     1,058      1,617
       Other liabilities....................................       484     (2,628)
                                                              --------    -------
          Net cash provided by (used in) operating
           activities.......................................     6,411       (115)
                                                              --------    -------
Cash flows from investing activities:
  Purchase of fixed income securities, available-for-sale...   (11,529)    (6,695)
  Purchase of equity securities.............................    (6,042)    (5,477)
  Sale and maturity of fixed income securities
     available-for-sale.....................................    11,069      6,784
  Sale of equity securities.................................     4,722      5,235
  Change in receivable/payable for securities...............      (100)       (60)
  Purchase of property and equipment........................      (203)       (81)
                                                              --------    -------
       Net cash provided by (used in) investing
        activities..........................................    (2,083)      (294)
                                                              --------    -------
       Net increase in cash and cash equivalents............     4,328       (409)
Cash and cash equivalents at beginning of period............     2,707      2,675
                                                              --------    -------
Cash and cash equivalents at end of period..................  $  7,035    $ 2,266
                                                              --------    -------
Cash paid during the year for:
  Interest..................................................  $      0    $     0
  Income taxes..............................................  $  1,462    $   730
</TABLE>
 
                                      F-21
<PAGE>   123
 
- ------------------------------------------------------------
- ------------------------------------------------------------
 
NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION OTHER THAN AS CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THE OFFERING MADE HEREBY, AND, IF GIVEN OR MADE,
SUCH INFORMATION SHALL NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE
COMPANY, MERCER MUTUAL, OR SANDLER O'NEILL. THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE SECURITIES
OFFERED HEREBY TO ANY PERSON IN ANY JURISDICTION IN WHICH SUCH OFFER OR
SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER OR
SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO ANY PERSON TO WHOM IT IS UNLAWFUL.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE HEREUNDER SHALL UNDER ANY
CIRCUMSTANCES CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY OR MERCER MUTUAL, SINCE THE DATE AS OF WHICH INFORMATION
IS FURNISHED HEREIN OR SINCE THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                   PAGE
                                                   ----
<S>                                                <C>
Prospectus Summary...............................    6
Mercer Mutual Selected Consolidated Financial
  Data...........................................   17
Risk Factors.....................................   20
Use of Proceeds..................................   30
Dividend Policy..................................   31
Market for the Common Stock......................   32
Capitalization...................................   33
Pro Forma Data...................................   34
Management's Discussion and Analysis of Financial
  Condition and Results of Operations............   40
Business.........................................   50
Management of the Company........................   71
The Conversion...................................   77
Certain Restrictions on Acquisition of the
  Company........................................   93
Description of Capital Stock.....................   96
Transfer Agent and Registrar.....................   97
Legal Opinions...................................   97
Experts..........................................   98
Available Information............................   98
Glossary of Selected Insurance Terms.............   99
Index to Consolidated Financial Statements.......  F-1
</TABLE>
 
                            ------------------------
 
UNTIL APRIL 26, 1999, ALL DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED
SECURITIES, WHETHER OR NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED
TO DELIVER A PROSPECTUS. THIS IS IN ADDITION TO THE OBLIGATION OF DEALERS TO
DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
- ------------------------------------------------------------
- ------------------------------------------------------------
- ------------------------------------------------------------
- ------------------------------------------------------------
 
                                     UP TO
 
                                3,392,500 SHARES
 
                         [MERCER INSURANCE GROUP LOGO]
                                  COMMON STOCK
                              --------------------
                                   PROSPECTUS
                              --------------------
 
                                JANUARY 26, 1999
 
                        Sandler O'Neill & Partners, L.P.
 
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- ------------------------------------------------------------


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