TRENWICK GROUP INC
10-Q, 1997-08-14
FIRE, MARINE & CASUALTY INSURANCE
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

(Mark One)

/x/  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934
     For the quarterly period ended June 30, 1997.



/ /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

     For the transition period __________ to __________ .

Commission file number 0-14737

                               TRENWICK GROUP INC.
             (Exact name of registrant as specified in its charter)

                 Delaware                                06-1152790
     (State or other jurisdiction of                  (I.R.S. Employer
      incorporation or organization)                 Identification No.)

                 Metro Center
              One Station Place
            Stamford, Connecticut                          06902
  (Address of principal executive offices)               (Zip Code)

Registrant's telephone number, including area code:    (203) 353-5500

                                      None
         (Former name, former address and former fiscal year, if changed
                               since last report)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

YES /x/  NO ......

Indicate the number of shares outstanding of each of the issuer's classes of
common stock.

<TABLE>
<CAPTION>
                 Class                      Outstanding at July 31, 1997
                 -----                      ----------------------------
<S>                                        <C>
     Common Stock, $.10 par value                     11,937,182
</TABLE>

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<PAGE>   2
                               TRENWICK GROUP INC.

                                      INDEX


<TABLE>
<CAPTION>
                                                                          Page
PART I.  Financial Information                                           Number
<S>                                                                    <C>
Consolidated Balance Sheet
  June 30, 1997 and December 31, 1996                                     3

Consolidated Statement of Income
  Three and Six Months Ended June 30, 1997 and 1996                       4

Consolidated Statement of Changes in Stockholders' Equity
  Three and Six Months Ended June 30, 1997 and 1996                       5

Consolidated Statement of Cash Flows
  Six Months Ended June 30, 1997 and 1996                                 6

Notes to Consolidated Financial Statements                               7-11

Management's Discussion and Analysis
  of Financial Condition and Results of Operations                       12-15


PART II.  Other Information

Item 4.  Submission of Matters to a Vote of Security Holders             16
Item 6.  Exhibits and Reports on Form 8-K                                16

Signatures                                                               17
</TABLE>
<PAGE>   3
                               TRENWICK GROUP INC.
                           CONSOLIDATED BALANCE SHEET
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                      June 30,           December 31,
                                                                         1997               1996
                                                                         (dollars in thousands)
<S>                                                                 <C>                <C>
          Assets

Securities available for sale at fair value:
 Debt securities (amortized cost: $777,146 and $700,476)             $   790,075         $ 713,998
 Equity securities (cost: $31,027 and $21,346)                            36,463            25,959
Cash and cash equivalents                                                 10,012            14,253
                                                                     -----------         ---------
     Total investments and cash                                          836,550           754,210

Accrued investment income                                                 10,970            10,386
Receivables from ceding insurers                                          79,981            62,689
Reinsurance recoverable balances, net                                     55,750            47,772
Deferred policy acquisition costs                                         23,836            21,805
Net deferred income taxes                                                 19,530            20,231
Other assets                                                              11,399             3,711
                                                                     -----------         ---------

     Total assets                                                    $ 1,038,016         $ 920,804
                                                                     ===========         =========

Liabilities and Stockholders' Equity

Liabilities:
 Unpaid claims and claims expenses                                   $   496,062         $ 467,177
 Unearned premium income                                                  83,374            71,448
 Convertible debentures                                                       --           103,500
 Other liabilities                                                        11,914            12,926
                                                                     -----------         ---------
     Total liabilities                                                   591,350           655,051
                                                                     -----------         ---------

Company-obligated mandatorily redeemable preferred
 capital securities of subsidiary trust holding solely junior
 subordinated debentures of Trenwick                                     110,000                --
                                                                     -----------         ---------

Common stockholders' equity:
 Common stock, $.10 par value, 22,500,000 shares
  authorized; 11,937,182 and 10,087,826 shares outstanding                 1,194             1,009
 Additional paid-in capital                                              153,434            94,423
 Retained earnings                                                       171,139           159,512
 Net unrealized appreciation of securities available for
  sale, net of income taxes                                               11,936            11,789
 Deferred compensation under stock award plan                             (1,037)             (980)
                                                                     -----------         ---------

     Total common stockholders' equity                                   336,666           265,753
                                                                     -----------         ---------
     Total liabilities and stockholders' equity                      $ 1,038,016         $ 920,804
                                                                     ===========         =========
</TABLE>

All share and per share information reflects a 3 for 2 stock split, paid on
April 15, 1997.

The accompanying notes are an integral part of these statements.

                                       3
<PAGE>   4
                               TRENWICK GROUP INC.
                        CONSOLIDATED STATEMENT OF INCOME
                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                    Three Months Ended               Six Months Ended
                                                          June 30,                       June 30,
                                                   1997           1996             1997            1996
                                                   ----           ----             ----            ----
                                                           (in thousands except per share data)
<S>                                             <C>            <C>              <C>             <C>
Revenues:
   Net premiums earned                           $47,105        $ 53,376         $101,019        $101,067
   Net investment income                          12,123          10,185           23,852          20,054
   Net realized investment gains (losses)              1             (11)           1,916              39
   Other income                                       10              --               10              --
                                                 -------        --------         --------        --------

       Total revenues                             59,239          63,550          126,797         121,160
                                                 -------        --------         --------        --------

Expenses:
   Claims and claims expenses incurred            27,486          32,775           58,290          61,974
   Policy acquisition costs                       14,580          14,716           31,957          26,958
   Underwriting expenses                           3,779           3,343            7,768           7,371
   Interest expense                                   --           1,625              890           3,249
   Minority interest in Trenwick
     Capital Trust                                 2,426              --            4,043              --
                                                 -------        --------         --------        --------

       Total expenses                             48,271          52,459          102,948          99,552
                                                 -------        --------         --------        --------

Income before income taxes and
   extraordinary item                             10,968          11,091           23,849          21,608
Income taxes                                       2,375           2,764            5,455           5,099
                                                 -------        --------         --------        --------
Income before extraordinary item                   8,593           8,327           18,394          16,509
Extraordinary loss on debt redemption,
   net of $558 income tax benefit                     --              --            1,037              --
                                                 -------        --------         --------        --------
Net income                                       $ 8,593        $  8,327         $ 17,357        $ 16,509
                                                 =======        ========         ========        ========

PRIMARY EARNINGS PER SHARE
Income before extraordinary item                 $   .71        $    .81         $   1.59        $   1.61
Extraordinary loss                                    --              --              .09              --
                                                 -------        --------         --------        --------
Net income                                       $   .71        $    .81         $   1.50        $   1.61
                                                 =======        ========         ========        ========

FULLY DILUTED EARNINGS PER SHARE
   (assuming conversion of dilutive
   convertible debentures)
Income before extraordinary item                 $   .71        $    .70         $   1.51        $   1.39
Extraordinary loss                                    --              --              .06              --
                                                 -------        --------         --------        --------
Net income                                       $   .71        $    .70         $   1.45        $   1.39
                                                 =======        ========         ========        ========

DIVIDENDS PER COMMON SHARE                       $   .24        $    .21         $    .48        $    .41
                                                 =======        ========         ========        ========
</TABLE>

All share and per share information reflects a 3-for-2 stock split, paid on
April 15, 1997.

The accompanying notes are an integral part of these statements.

                                       4
<PAGE>   5
                               TRENWICK GROUP INC.
            CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                   Three Months Ended          Six Months Ended
                                                                          June 30,                   June 30,
                                                                   1997            1996        1997            1996
                                                                   ----            ----        ----            ----
                                                                                   (dollars in thousands)
<S>                                                             <C>           <C>           <C>           <C>
Common stockholders' equity, beginning of period                 $ 322,474     $ 239,338     $ 265,753     $ 240,776

Common stock, $.10 par value, and additional paid-in-capital:

Conversion of debentures (1,783,926)                                    --            --        57,780            --
Exercise of employer stock options
 (750, 179,778, 60,750 and 191,778 shares)                              20         3,438           776         3,596
Income tax benefits from additional
 compensation deductions allowable
 for income tax purposes                                                 7           959           483         1,053
Restricted common stock awarded
 (362, 9,782 and 9,654 shares)                                          --            13           328           333
Restricted common stock awards cancelled
 (2,100 shares)                                                         --           (91)           --           (91)
Common stock purchased and retired
 (25,205, 5,091 and 30,431 shares)                                      --          (843)         (171)       (1,023)

Retained earnings:

Net income                                                           8,593         8,327        17,357        16,509
Cash dividends                                                      (2,865)       (2,078)       (5,730)       (4,124)

Net unrealized appreciation of securities available for sale:

Change in unrealized appreciation                                   12,767        (5,861)          226       (17,828)
Change in applicable deferred income taxes                          (4,466)        2,052           (79)        6,240

Deferred compensation under stock award plan:

Restricted common stock awarded                                         --           (13)         (328)         (333)
Restricted common stock awards cancelled                                --            91            --            91
Compensation expense recognized                                        136           136           271           269
                                                                 ---------     ---------     ---------     ---------

Common stockholders' equity, end of period                       $ 336,666     $ 245,468     $ 336,666     $ 245,468
                                                                 =========     =========     =========     =========
</TABLE>

All share and per share information reflects a 3-for-2 stock split, paid on
April 15, 1997.

The accompanying notes are an integral part of these statements.

                                       5
<PAGE>   6
                               TRENWICK GROUP INC.
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                             Six Months Ended
                                                                 June 30,
                                                           1997              1996
                                                           ----              ----
                                                              (in thousands)
<S>                                                    <C>               <C>
Cash flows from operating activities:
 Premiums collected                                     $  73,612         $ 79,066
 Ceded premiums paid                                       (4,328)          (3,109)
 Claims and claims expenses paid                          (55,859)         (43,994)
 Claims and claims expenses recovered                       2,121            3,175
 Underwriting expenses paid                                (8,230)          (7,713)
                                                        ---------         --------

 Cash provided by underwriting activities                   7,316           27,425
 Net investment income received                            24,509           20,573
 Interest expense paid                                       (496)          (3,085)
 Income taxes paid (recovered)                             (6,226)          (4,881)
 Other income received                                         10               --
                                                        ---------         --------

    Cash provided by operating activities                  25,113           40,032
                                                        ---------         --------


Cash flows for investing activities:
 Purchases of debt securities                            (137,869)         (72,910)
 Sales of debt securities                                  33,980            7,936
 Maturities of debt securities                             26,002           26,207
 Purchases of equity securities                           (12,390)            (115)
 Sales of equity securities                                 4,621            2,375
 Additions to premises and equipment                          (78)            (407)
                                                        ---------         --------

    Cash used for investing activities                    (85,734)         (36,914)
                                                        ---------         --------

Cash flows for financing activities:
 Issuance of mandatorily redeemable preferred
  capital securities                                      110,000               --
 Redemption of convertible debentures                     (46,997)              --
 Issuance costs of capital securities                      (1,498)              --
 Issuance of common stock                                     776            3,596
 Repurchase of common stock                                  (171)          (1,023)
 Dividends paid                                            (5,730)          (4,124)
                                                        ---------         --------

    Cash provided (used) by financing activities           56,380           (1,551)
                                                        ---------         --------

Change in cash and cash equivalents                        (4,241)           1,567

Cash and cash equivalents, beginning of period             14,253            6,760
                                                        ---------         --------

Cash and cash equivalents, end of period                $  10,012         $  8,327
                                                        =========         ========
</TABLE>

The accompanying notes are an integral part of these statements.

                                       6
<PAGE>   7
                               TRENWICK GROUP INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

      Basis of Presentation

      The interim consolidated financial statements included those of Trenwick
      Group Inc. and its subsidiaries and have been prepared in conformity with
      generally accepted accounting principles applied on a basis consistent
      with prior periods. Certain items in the financial statements have been
      reclassified to conform with the 1997 presentation.

      Management is required 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.

      The interim consolidated financial statements are unaudited; however, in
      the opinion of management, the interim consolidated financial statements
      include all adjustments, consisting only of normal recurring adjustments,
      necessary for a fair statement of the results for the interim periods.
      These interim statements should be read in conjunction with the 1996
      audited financial statements and related notes.

      Earnings Per Share

      Primary earnings per share are computed based on the weighted average
      number of shares of common stock and common stock equivalents outstanding
      during each year. Primary weighted average shares outstanding are adjusted
      to reflect as outstanding, throughout each year presented, common stock
      equivalents pursuant to the assumed exercise of stock options. Fully
      diluted earnings per share are computed based on the assumption that the
      convertible debentures are converted into common shares. Supplemental
      earnings per share reflect primary earnings per share adjusted as if the
      conversion was consummated as of the beginning of the period.

                                       7
<PAGE>   8
      The weighted average shares of common stock outstanding and net income per
      share amounts are as follows:

<TABLE>
<CAPTION>
                                                     Three Months Ended                Six Months Ended
                                                          June 30,                         June 30,
                                                    1997              1996            1997           1996
                                                    ----              ----            ----           ----
<S>                                               <C>              <C>             <C>            <C>
      WEIGHTED AVERAGE SHARES OF
        COMMON STOCK OUTSTANDING:

      Primary                                      12,114           10,226          11,593         10,227
      Supplemental                                 12,114           12,010          12,096         12,011
      Fully diluted                                12,114           13,443          12,186         13,430


      PER SHARE AMOUNTS:

      Primary                                        $.71             $.81           $1.50          $1.61
                                                     ====             ====           =====          =====
      Supplemental                                   $.71             $.74           $1.46          $1.47
                                                     ====             ====           =====          =====
      Fully diluted                                  $.71             $.70           $1.45          $1.39
                                                     ====             ====           =====          =====
</TABLE>

      In February 1997, the Financial Accounting Standards Board issued
      Statement of Financial Accounting Standards No. 128, "Earnings per Share"
      which establishes new guidelines for the computation and disclosure of
      earnings per share. This statement is required to be adopted on December
      31, 1997 and earlier adoption is not permitted. Current earnings per share
      ("EPS") disclosures will be replaced by basic EPS and diluted EPS as
      defined in the statement. The expected effect of the statement on net
      income per share amounts is as follows:

<TABLE>
<CAPTION>
                                                      Three Months Ended             Six Months Ended
                                                            June 30,                        June 30,
                                                    1997              1996            1997           1996
                                                    ----              ----            ----           ----
<S>                                                <C>               <C>            <C>            <C>
      Basic                                          $.72             $.84           $1.53          $1.67
                                                     ====             ====           =====          =====
      Diluted                                        $.71             $.70           $1.47          $1.39
                                                     ====             ====           =====          =====
</TABLE>

      Issuance costs of capital securities

      The issuance costs associated with the issuance of the capital securities
      are being amortized over the term of the junior subordinated debentures.

                                       8
<PAGE>   9
2.    REINSURANCE

      Trenwick purchases reinsurance to reduce its exposure to catastrophe
      losses and the frequency of large losses in all lines of business.
      Trenwick, however, remains liable in the event that its retrocessionaires
      do not meet their contractual obligations. The effects of reinsurance on
      premiums written, premiums earned and claims and claims expenses incurred
      is as follows (in thousands):


<TABLE>
<CAPTION>
                                                         Premiums Written
                                        Three Months Ended                Six Months Ended
                                              June 30,                        June 30,

                                        1997          1996                1997         1996
                                        ----          ----                ----         ----
<S>                                   <C>          <C>                 <C>          <C>     
      Assumed                          $59,681       $65,503            $132,418     $129,534

      Ceded                            (10,835)       (5,232)            (24,014)     (10,380)
                                      --------     ---------           ---------    ---------

      Net                              $48,846       $60,271            $108,404     $119,154
                                       =======       =======            ========     ========
</TABLE>


<TABLE>
<CAPTION>
                                                        Premiums Earned
                                        Three Months Ended                 Six Months Ended
                                              June 30,                         June 30,

                                        1997          1996                1997         1996
                                        ----          ----                ----         ----
<S>                                   <C>           <C>                <C>          <C>
      Assumed                          $56,266       $58,592            $120,491     $111,427

      Ceded                             (9,161)       (5,216)            (19,472)     (10,360)
                                       -------       -------            --------     --------

      Net                              $47,105       $53,376            $101,019     $101,067
                                       =======       =======            ========     ========
</TABLE>


<TABLE>
<CAPTION>
                                              Claims and Claims Expenses Incurred
                                        Three Months Ended                 Six Months Ended
                                             June 30,                          June 30,

                                        1997          1996                1997           1996
                                        ----          ----                ----           ----
<S>                                   <C>           <C>                 <C>           <C>
      Assumed                          $39,359       $39,579             $85,876       $ 75,927

      Ceded                            (11,873)       (6,804)            (27,586)       (13,953)
                                       -------       -------             -------       --------

      Net                              $27,486       $32,775             $58,290       $ 61,974
                                       =======       =======             =======       ========
</TABLE>

                                       9
<PAGE>   10
3.    MANDATORILY REDEEMABLE PREFERRED CAPITAL SECURITIES

      On January 28, 1997, Trenwick completed a private offering of $110 million
      in 8.82% Subordinated Capital Income Securities ("Capital Securities")
      through Trenwick Capital Trust I ("Trust"), a Delaware statutory business
      trust. Trenwick owns all the common securities of the Trust ("Common
      Securities"). Concurrently with the issuance of the Capital Securities,
      the Trust invested the proceeds their sale, together with the
      consideration paid to the Trust by Trenwick for the Common Securities, in
      Trenwick's Junior Subordinated Debentures, whose terms are similar to
      those of the Capital Securities.

      The Trust was formed for the sole purpose of issuing the Capital
      Securities and the Common Securities, investing the proceeds thereof in
      the Junior Subordinated Debentures and making distributions to the holders
      of the Capital Securities. The Capital Securities mature on February 1,
      2037; require preferential cumulative cash distributions at an annual rate
      of 8.82%, payable semi-annually on February 1 and August 1 (beginning
      August 1, 1997) from the payment of interest on the Junior Subordinated
      Debentures; and are guaranteed by Trenwick, within certain limits, as to
      the payment of distributions and liquidation or redemption payments. They
      are subject to mandatory redemption, (i) in whole but not in part at
      maturity, upon repayment of the Junior Subordinated Debentures, at a
      redemption price equal to the principal amount plus accrued and unpaid
      interest; (ii) in whole but not in part at any time, contemporaneously
      with the optional prepayment of the Junior Subordinated Debentures upon
      the occurrence and continuation of certain events, at a redemption price
      equal to the greater of the principal amount or the present value of
      principal and interest payable to February 1, 2007, plus accrued and
      unpaid interest and possible additional sums; and (iii) in whole or in
      part, after February 1, 2007, contemporaneously with the optional
      prepayment of the Junior Subordinated Debentures, at a redemption price
      equal to the principal amount plus accrued and unpaid interest and
      possible additional sums. Upon the occurrence and continuation of an event
      of default with respect to the Junior Subordinated Debentures, the Capital
      Securities shall have a preference over the Common Securities. Upon the
      occurrence of an event of default (A) with respect to the Junior
      Subordinated Debentures which is attributable to Trenwick's failure to
      make required payments or (B) with respect to Trenwick's guarantee, the
      holders of the Capital Securities may institute a direct action against
      Trenwick.

      In accordance with their terms, the Capital Securities were exchanged for
      fully registered Capital Securities, which are not subject to restrictions
      on transfer.

4.    STOCKHOLDERS' EQUITY

      Preferred Stock

      Trenwick has 1,000,000 shares of $.10 par value preferred stock authorized
      and none outstanding.

      Stock Options and Benefit Plans

      For the six months ended June 30, 1997, Trenwick awarded key employees an
      aggregate of 9,782 shares of common stock under the terms of the 1989
      Stock Plan, valued at an average of $33.50 per share (approximately
      $328,000). Trenwick is recognizing compensation expense determined by the
      value of the shares, amortized over a five year vesting period. During the
      six month period, 5,091 shares were repurchased at an average of $33.50
      per share (approximately $171,000) in connection with the satisfaction of
      withholding taxes payable upon the vesting of shares previously awarded
      under the plan.

                                       10
<PAGE>   11

      Common Stock

      On May 21, 1997, Trenwick's Board of Directors approved a stock repurchase
      program covering up to one million shares of the Company's common stock;
      no shares have been repurchased to date.

      On March 6, 1997, Trenwick's Board of Directors approved a three-for-two
      stock split which was paid on April 15, 1997 to stockholders of record at
      the close of business on March 18, 1997. An amount equal to the par value
      of the additional shares issued has been transferred from additional
      paid-in capital to common stock. In this report, all share and per share
      data have been retroactively restated to reflect the stock split.

                                       11
<PAGE>   12
                             MANAGEMENT'S DISCUSSION
                     AND ANALYSIS OF FINANCIAL CONDITION AND
                              RESULTS OF OPERATIONS


OVERVIEW

Trenwick ("Trenwick") is a holding company whose principal subsidiary, Trenwick
America Reinsurance Corporation ("Trenwick America Re") reinsures property and
casualty risks written by U.S. insurance companies. Substantially all of
Trenwick America Re's business is produced by reinsurance brokers. Trenwick
America Re divides its business into three categories: treaty, specialty and
facultative.

OPERATING RESULTS

Trenwick Group Inc. reported consolidated net income of $8.6 million or $.71 per
share for the second quarter of 1997 compared to $8.3 million or $.70 per fully
diluted share for the second quarter of 1996. Per share earnings in the second
quarter of 1997 reflect weighted average shares of 12.1 million, which should be
compared to fully diluted weighted average shares of 13.4 million in the second
quarter of 1996. The decrease in the average number of shares resulted from the
redemption of $45.8 million principal amount of Trenwick's 6% convertible
debentures called February 20, 1997.

For the first half of 1997, Trenwick's income before extraordinary item was
$18.4 million or $1.59 per share compared to $16.5 million or $1.61 per share in
the first half of 1996. Net income per fully diluted share was $1.45 for the
first half of 1997 compared to $1.39 for the first half of 1996.

PREMIUMS

Trenwick's decision not to participate in the continuing downward spiral in
property/casualty reinsurance rates contributed to the 9% decline in gross
written premium and a 19% decline in net premiums written for the second quarter
of 1997 compared to the second quarter of 1996. This decline in net premiums
written is magnified by Trenwick's previously announced decision to buy more
reinsurance protection in 1997 in light of the continued general deterioration
in reinsurance pricing and the opportunity to buy additional protection at more
favorable terms than in prior years.

                                       12
<PAGE>   13
The distribution of the Company's net premiums written by type was as follows
(in thousands):

<TABLE>
<CAPTION>
                         Three Months Ended                  Six Months Ended
                               June 30,                              June 30,
                   1997         1996    % Change        1997          1996       % Change
                   ----         ----    --------        ----          ----       --------
<S>               <C>        <C>        <C>           <C>         <C>            <C>
CASUALTY
   Treaty         $36,784    $ 40,785     (10)%       $ 71,034    $  78,136         (9)%
   Specialty        7,259      11,569     (37)          22,879       21,349          7
   Facultative        730       1,592     (54)           2,037        2,946        (31)
                  -------    --------     ---         --------    ---------        ---
                   44,773      53,946     (17)          95,950      102,431         (6)
PROPERTY            4,073       6,325     (36)          12,454       16,723        (26)
                  -------    --------     ---         --------    ---------        ---
Total             $48,846    $ 60,271     (19)%       $108,404    $ 119,154         (9)%
                  =======    ========     ===         ========    =========        ===
</TABLE>
                                                                               
Trenwick's premium writings declined in the second quarter of 1997 as a result
of a reduction in existing casualty treaty and specialty business. While, to
date, new casualty business has offset the decline in premiums due to the
non-renewal of certain accounts, premium writings from existing business have
declined as a result of increased competition among primary companies. This
increase in competition has caused cedants to reduce their premium writings or
restructure their reinsurance programs, reducing the amount of reinsurance they
purchase. Property business continued to decline primarily as a result of the
Company's conservative response to continued erosion in catastrophe reinsurance
pricing.

New casualty business increased 31% and 30% in the quarter and first half of
1997 over the same periods in 1996 and represented approximately 47% and 37% of
total premium writings during the periods. Continuing casualty business
decreased 28% and 5% in the quarter and for the first half of 1997 over the same
periods in 1996. Continuing casualty business represented 45% and 52% of the
total premium writings during the periods. The Company's property business
represented approximately 8% and 11% of total premium writings for the quarter
and first half of 1997.

UNDERWRITING EXPERIENCE

The combined ratio is one means of measuring the profitability of a property and
casualty company. The combined ratio reflects underwriting experience, but does
not reflect income from investments or provisions for income taxes. A combined
ratio below 100% indicates profitable underwriting and a combined ratio
exceeding 100% indicates unprofitable underwriting. Although a reinsurer may
have unprofitable underwriting results, the reinsurer may still be profitable
because of investment income earned on the accumulated invested assets.

                                       13
<PAGE>   14
The following table sets forth Trenwick's combined ratios and the components
thereof calculated on a GAAP basis for the period indicated, together with
Trenwick America Re's combined ratio calculated on a statutory basis:

<TABLE>
<CAPTION>
                                          Three Months Ended     Six Months Ended
                                              June 30,               June 30,
                                           1997      1996         1997     1996
                                           ----      ----         ----     ----
<S>                                       <C>        <C>         <C>       <C>
Claims and claims expense ratio             58.4%    61.4%        57.7%    61.3%
                                          ------     ----         ----     ----
Expense ratio:                                                  
  Policy acquisition expense ratio          30.9     27.6         31.6     26.7
  Underwriting expense ratio                 8.0      6.3          7.7      7.3
                                          ------     ----         ----     ----
  Total expense ratio                       38.9%    33.9%        39.3%    34.0%
                                          ------     ----         ----     ----
                                                                
Combined ratio (GAAP basis)                 97.3%    95.3%        97.0%    95.3%
                                          ------     ----         ----     ----
                                                                
Trenwick America Re                                             
 statutory combined ratio                   96.1%    95.3%        96.0%    94.6%
                                          ------     ----         ----     ----
</TABLE>
                                                        
As indicated, Trenwick's claims and claims expense ratio improved in the second
quarter and first half of 1997 compared to the same periods in 1996. The claims
and claims expense ratio in the second quarter and first half of 1997 includes
prior period favorable development of approximately $900,000 and $2.9 million,
respectively. This improvement in the claims and claims expense ratio is
partially offset by a continued shift in the mix of business from excess to
quota share along with profit commission incurred on business written in prior
years.

INVESTMENT INCOME

Net investment income of $12.1 million in the second quarter of 1997 increased
19% compared to $10.2 million for the same period in 1996. Net investment income
of $23.9 million in the first half of 1997 increased 19% compared to $20.1
million in the first half of 1996. Pre-tax yields on invested assets, excluding
equity securities, averaged 6.4% and 6.5% in 1997 and 1996, respectively. The
increase in investment income is due to the continued growth in Trenwick's
invested asset base. This growth resulted primarily from funds received of $29.7
million from the aggregate excess of loss commutation recorded in December 1996,
coupled with approximately $61 million of funds received in January 1997 from
Trenwick's previously reported private offering of $110 million 8.82%
Subordinated Capital Income Securities. The remaining proceeds were used to
redeem $46 million principal amount of the Company's convertible debentures,
plus accrued interest.

After-tax net investment income in the second quarter and first half of 1997 was
$9.3 million and $18.4 million compared to $7.9 million and $15.7 million for
the comparative periods in 1996. The effective tax rate on net investment income
for the first half of 1997 was approximately 22.9%, versus 22.0% for the same
period in 1996.

                                       14
<PAGE>   15
LIQUIDITY AND CAPITAL RESOURCES

As of June 30, 1997, Trenwick's consolidated investments and cash totaled $836.6
million, as compared to $754.2 million at December 31, 1996. The fair value of
the Company's debt securities portfolio exceeded amortized cost of $777.1
million and $700.5 million by $12.9 million and $13.5 million at June 30, 1997
and December 31, 1996, respectively. At June 30, 1997 and at December 31, 1996,
the fair value of the Company's equity securities exceeded cost of $31.0 million
and $21.3 million by $5.4 million and $4.6 million, respectively.

As of June 30, 1997, Trenwick's consolidated stockholders' equity totaled $336.7
million or $28.20 per share, as compared to $265.8 million or $26.34 per share
at December 31, 1996. This $70.9 million increase resulted primarily from the
conversion of $57.7 million in debentures into approximately 1.8 million shares.
Since December 31, 1996, the unrealized appreciation of debt and equity
investments nominally increased by $147,000, net of tax, or $.01 per
share.

In January 1997, the Company made a private offering of $110,000,000 in 8.82%
Subordinated Capital Income Securities due February 20, 2037 through Trenwick
Capital Trust I, a Delaware statutory business trust. In connection with this
offering, the Company called for redemption all $103,500,000 aggregate principal
amount of the Company's 6% convertible debentures due December 15, 1999, on
February 20, 1997, at a redemption price of 102.57% principal amount plus
accrued interest to the redemption date. Of the $103,500,000 principal amount of
debentures outstanding on that date, $45,819,000 principal amount were redeemed
and $57,681,000 principal amount were converted into an aggregate of 1,783,926
shares of the Company's common stock, par value $.10 per share. The remaining
net proceeds from the offering of the Capital Securities will be used for
general corporate purposes, which may include investments in and advances to
subsidiaries, the financing of growth and expansion, stock repurchases, the
financing of possible future acquisitions and other corporate purposes.

Statutory surplus of Trenwick America Re was $304.5 million as of June 30, 1997,
compared to $286.3 million as of December 31, 1996. Cash flow from operations of
$25.1 million in the first half of 1997 decreased approximately 37% compared to
cash flow from operations of $40.0 million in the first half of 1996. In the
first half last year, the Company benefited from non-recurring premium
collections of approximately $7 million and below average paid loss activity.
Cash provided by financing activities in the first half of 1997 increased to
$56.4 million compared to cash used for financing activities of $1.6 million in
the first half of 1996. This increase primarily resulted from funds received
from the aforementioned private offering partially offset by the debt
redemption.

Trenwick declared a second quarter dividend of $.24 per share in 1997, a 14%
increase compared to $.21 in the second quarter of 1996.

                                       15
<PAGE>   16
PART II. OTHER INFORMATION


Item 4. Submission of Matters to a Vote of Security Holders

A total of 6,760,293 shares, or 85% of the 7,957,628 shares of common stock
outstanding on the March 27, 1997 record date, were represented at the Company's
Annual Meeting of Stockholders held on May 22, 1997. Voting results were as
follows:

On the proposal to elect three directors to serve in Class I until 2000, each of
Messrs. W. Marston Becker and James F. Billett, Jr. was elected by an
affirmative vote of 6,754,593 shares, with 5,700 shares withheld, and Mr. Joseph
D. Sargent was elected by an affirmative vote of 6,754,497 shares, with 5,796
shares withheld. The Proxy Committee voted its proxies for Mr. Becker in lieu of
nominee Alan R. Gruber, who died subsequent to his nomination. Messrs. Herbert
Palmberger, Frederick D. Watkins and Stephen R. Wilcox continue to serve in
Class II until 1998, and Messrs. Anthony S. Brown, Neil Dunn and P. Anthony
Jacobs continue to serve in Class III until 1999.

On the proposal to amend the Company's Restated Certificate of Incorporation to
increase the authorized shares of common stock from 15,000,000 to 30,000,000 and
to increase the authorized shares of preferred stock from 1,000,000 to
2,000,000, there were 6,460,764 shares voted in favor, 200,455 shares opposed
and 18,451 shares abstaining.

On the proposal to increase the aggregate number of shares authorized for
issuance under the 1993 Stock Option Plan by 500,000 shares, there were
6,002,834 shares voted in favor, 86,683 shares opposed and 570,626 shares
abstaining.

On the proposal to ratify the appointment of Price Waterhouse LLP as independent
accountants for the year ending December 31, 1997, there were 6,754,083 shares
voted in favor, 610 shares opposed and 5,600 shares abstaining.

Item 6. Exhibits and Reports on Form 8-K

         a)   Exhibits
                     3(i)  Certificate of Amendment of Restated Certificate of
                           Incorporation of Trenwick Group Inc. dated as of 
                           May 13, 1986, June 2, 1987 and May 27, 1997.

                11.0  Computation of Earnings Per Share
                27.0  Financial Data Schedule

         b)   Reports on Form 8-K

              None

                                       16
<PAGE>   17
                                   SIGNATURES

  Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its behalf by the
  undersigned thereunto duly authorized.


                                                    TRENWICK GROUP INC.
                                            -----------------------------------
                                                       (Registrant)

  Date:  August 14, 1997                            JAMES F. BILLETT, JR.
        ----------------                    -----------------------------------
                                            James F. Billett, Jr.
                                            Chairman, President and
                                            Chief Executive Officer


  Date:  August 14, 1997                               ALAN L. HUNTE
         ---------------                    -----------------------------------
                                            Alan L. Hunte
                                            Vice President, Chief Financial 
                                              Officer and Treasurer

                                       17

<PAGE>   1
                            CERTIFICATE OF AMENDMENT
                                       OF
                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                               TRENWICK GROUP INC.

         Trenwick Group Inc., a corporation organized and existing under the
laws of the State of Delaware, hereby certifies as follows:

         (a) The name of the corporation is Trenwick Group Inc. The date of its
original Certificate of Incorporation with the Secretary of State was October
29, 1985.

         (b) This Certificate of Amendment of Restated Certificate of
Incorporation amends the Restated Certificate of Incorporation by amending the
first sentence of paragraph 4 thereof to increase the number of authorized
common shares and preferred shares.

         (c) The text of the first sentence of paragraph 4 as amended is herein
set forth in full:

                  4. The aggregate number of shares which the corporation is
         authorized to issue is 32,000,000 shares, to consist of 30,000,000
         Common shares ("Common Stock") at a par value of $.10 each and
         2,000,000 Preferred shares ("Preferred Stock") at a par value of $.10
         each.

         (d) This Certificate of Amendment of Restated Certificate of
Incorporation was duly adopted by vote of the directors and of the stockholders
in accordance with Section 242 of the General Corporation Law of the State of
Delaware.
<PAGE>   2
IN WITNESS WHEREOF, said Trenwick Group Inc. has caused this certificate to be
signed by James F. Billett, Jr., its Chairman of the Board of Directors, and
attested by Jane T. Wiznitzer, its Secretary, this 27th day of May, 1997.


                                              TRENWICK GROUP INC.

                                              By /s/ James F. Billett, Jr.
                                                 -------------------------------
                                                 James F. Billett, Jr.
                                                 Chairman of the Board




ATTEST:


/s/ Jane T. Wiznitzer
- -----------------------------
Jane T. Wiznitzer
Secretary
<PAGE>   3
                            CERTIFICATE OF AMENDMENT
                                       OF
                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                               TRENWICK GROUP INC.

         Trenwick Group Inc., a corporation organized and existing under the
laws of the State of Delaware, hereby certifies as follows:

         (a) The name of the corporation is Trenwick Group Inc. The date of its
original Certificate of Incorporation with the Secretary of State was October
29, 1985.

         (b) This Certificate of Amendment of Restated Certificate of
Incorporation amends the Restated Certificate of Incorporation by adding a new
paragraph 12 regarding the elimination of director liability for monetary
damages for breaches of directors' fiduciary duty of care.

         (c) The text of the new paragraph 12 is herein set forth in full:

         12. A director of the corporation shall not be personally liable to the
corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director, except for liability (i) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (iii) under Section 174 of the Delaware General Corporation
Law, as the same exists or hereafter may be amended, or (iv) for any transaction
from which the director derived an improper personal benefit. If the Delaware
General Corporation Law hereafter is amended to authorize the further
elimination or limitation of the liability of directors, then the liability of a
director of the corporation, in addition to the limitation on
<PAGE>   4
personal liability provided herein, shall be limited to the fullest extent
permitted by the amended Delaware General Corporation Law. Any repeal or
modification of this paragraph by the stockholders of the corporation shall be
prospective only, and shall not adversely affect any limitation on the personal
liability of a director of the corporation existing at the time of such repeal
or modification.

         (d) This Certificate of Amendment of Restated Certificate of
Incorporation was duly adopted by vote of the directors and of the stockholders
in accordance with Sections 242 of the General Corporation Law of the State of
Delaware.

         IN WITNESS WHEREOF, said Trenwick Group Inc. has caused this
certificate to be signed by James F. Billett, Jr., its Chairman of the Board of
Directors, and attested by Barbara R. Freed, its Secretary this 2nd day of June,
1987.

                                                   TRENWICK GROUP INC.
                                                   James F. Billett, Jr.

                                                   By /s/ James F. Billett, Jr.
                                                      -------------------------


ATTEST:

By /s/ Barbara R. Freed
- ----------------------------
        Secretary

                                        2
<PAGE>   5
                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                               TRENWICK GROUP INC.






                  Trenwick Group Inc., a corporation organized and existing
  under the laws of the State of Delaware, hereby certifies as follows:

         (a) The name of the corporation is Trenwick Group Inc. The date of
filing of its original Certificate of Incorporation with the Secretary of State
was October 29, 1985.

         (b) This Restated Certificate of Incorporation restates and integrates
and further amends the Certificate of Incorporation of this corporation by
deleting the previous paragraphs 4, 5, 6, 7, 8 and 10, adding a new paragraph 4
amending the authorized capital of the corporation, renumbering previous
paragraph 9 as paragraph 5, adding a new paragraph 6 regarding the
classification and removal of directors, adding a new paragraph 7 regarding the
procedure for nomination and election of directors, adding a new paragraph 8
regarding stockholder and director actions in the event of certain business
transactions, adding a new paragraph 9 regarding amendments of new paragraphs 6
and 7, and renumbering previous paragraphs 11 and 12 as paragraphs 10 and 11,
respectively, with amendments for consistency.
<PAGE>   6
         (c) The text of the Certificate of Incorporation as amended or
supplemented heretofore is further amended hereby to read as herein set forth in
full:

                 "1. The name of the corporation is Trenwick Group Inc.

                  2. The address of its registered office in the State of
         Delaware is Corporation Trust Center, 1209 Orange Street, in the City
         of Wilmington, County of New Castle. The name of its registered agent
         at such address is The Corporation Trust Company.

                  3. The nature of the business or purposes to be conducted or
         promoted is to engage in any lawful act or activity for which
         corporations may be organized under the General Corporation Law of
         Delaware.

                  4. The aggregate number of shares which the corporation is
         authorized to issue is 16,000,000 shares, to consist of 15,000,000
         Common shares ("Common Stock") at a par value of $.10 each and
         1,000,000 Preferred shares ("Preferred Stock") at a par value of $.10
         each.

                     The designations, relative rights, preferences and
         limitations of the shares of each class are as follows:

                  (a) Common Stock

                     (1) Each holder of Common Stock is entitled to one vote for
         each share of Common Stock on all matters to be voted on and is not
         entitled to cumulative voting for the election of directors.

                     (2) Subject to provisions of law and the rights of the
         Preferred Stock and any one or more series thereof having a preference
         as to dividends over the Common Stock then outstanding, dividends may
         be paid on the Common Stock at such times and in such amounts as the
         board of directors shall determine.

                     (3) Upon the liquidation, dissolution or winding up of the
         corporation, after any preferential amounts to be distributed to the
         holders of the Preferred Stock and any one or more series thereof
         having a preference over the Common Stock then outstanding have been
         paid or declared and set apart for payment, the holders of the Common
         Stock shall be entitled to receive all the remaining assets of


                                      - 2 -


<PAGE>   7
         the corporation available for distribution to its stockholders ratably
         in proportion to the number of shares of Common Stock held by them
         respectively.

                     (4) The holders of the Common Stock do not have any
         preemptive or preferential right to purchase or subscribe for any part
         of the unissued capital stock of the corporation of any class or for
         any new issue of stock of any class, whether now or hereafter
         authorized or issued.

                  (b) Preferred Stock

                     The board of directors is expressly authorized to adopt,
         from time to time, a resolution or resolutions providing for the issue
         of Preferred Stock in one or more series, with such voting powers, full
         or limited, or without voting powers, and with such designations,
         preferences and relative, participating, optional or other special
         rights, and qualifications, limitations or restrictions thereof as
         shall be expressed in such resolution or resolutions, including,
         without limiting the generality of the foregoing, the following:

                           (1)   the designation and number of shares or series;

                           (2)   the dividend rate of such series, the
                                 conditions and dates upon which such dividends
                                 shall be payable, the preference or relation of
                                 such dividends to dividends payable on any
                                 other class or classes of capital stock of the
                                 corporation, and whether such dividends shall
                                 be cumulative or noncumulative;

                           (3)   whether the shares of such series shall be
                                 subject to redemption by the corporation, and,
                                 if made subject to such redemption, the times,
                                 prices, rates, adjustments and other terms and
                                 conditions of such redemption;

                           (4)   the terms and amount of any sinking or similar
                                 fund provided for the purchase or redemption of
                                 the shares of such series;

                           (5)   whether the shares of such series shall be
                                 convertible into or exchangeable for shares of
                                 capital stock or other securities of the
                                 corporation or of any other corporation, and,
                                 if provision be made for conversion or
                                 exchange, the times, prices, rates,

                                     - 3 -
<PAGE>   8
                                 adjustments and other terms and conditions of
                                 such conversion or exchange;

                           (6)   the extent, if any, to which the holders of the
                                 shares of such series shall be entitled to vote
                                 as a class or otherwise with respect to the
                                 election of directors or otherwise;

                           (7)   the restrictions and conditions, if any, upon
                                 the issue or reissue of any additional
                                 Preferred Stock ranking on a parity with or
                                 prior to such shares as to dividends or upon
                                 dissolution;

                           (8)   the rights of the holders of the shares of such
                                 series upon the dissolution of, or upon the
                                 distribution of assets of, the corporation,
                                 which rights may be different in the case of
                                 voluntary dissolution than the case of
                                 involuntary dissolution; and

                           (9)   any other relative rights, preferences or
                                 limitations of shares of such series consistent
                                 with this Section 4(b) and applicable law.

                   5. In furtherance and not in limitation of the powers
         conferred by statute, the board of directors is expressly authorized to
         make, alter or repeal the By-Laws of the corporation.

                   6. (a) At the 1987 annual meeting of stockholders, the
         directors elected to serve on the corporation's board of directors
         shall be divided into three classes, designated Class I, Class II and
         Class III. Each class shall consist, as nearly as may be possible, of
         one-third of the total number of directors constituting the whole board
         of directors. Class I directors shall be elected for a one-year term,
         Class II directors for a two-year term and Class III directors for a
         three-year term. At each succeeding annual meeting of stockholders
         beginning in 1988, successors to the class of directors whose term
         expires at that annual meeting shall be elected for a three-year term.

                      (b) Notwithstanding the foregoing, whenever the holders of
         any one or more classes or series of Preferred Stock issued by the
         corporation shall have the right, pursuant to Section 4(b) hereof,
         voting separately by class or series, to elect directors at an annual
         or special meeting of stockholders, the election, term of office,

                                     - 4 -
<PAGE>   9
         filling of vacancies and other features of such directorships shall be
         governed by the terms applicable thereto, and such directors so elected
         shall not be divided into classes pursuant to Section 6(a) unless
         expressly provided by the terms of such Preferred Stock.

                      (c) Subject to the rights of the holders of any one or
         more classes or series of Preferred Stock issued by the corporation,
         any director may be removed from office, with or without cause, only by
         the affirmative vote of the holders of eighty percent (80%) of the
         combined voting power of the then outstanding shares of stock entitled
         to vote generally in the election of directors, voting together as a
         single class.

                   7. Subject to the rights of holders of any one or more
         classes or series of Preferred Stock issued by the corporation,
         nominations for the election of directors may be made by the board of
         directors (or a proxy committee appointed by the board of directors) or
         by any stockholder entitled to vote in the election of directors
         generally. However, any stockholder entitled to vote generally in the
         election of directors may nominate one or more persons for election as
         directors at a meeting only if written notice of such stockholder's
         intent to make such nomination or nominations has been given, either by
         personal delivery or by United States mail, postage prepaid, to the
         Secretary of the corporation not later than (i) with respect to an
         election to be held at an annual meeting of stockholders, ninety (90)
         days in advance of such meeting, and (ii) with respect to an election
         to be held at a special meeting of stockholders for the election of
         directors, the close of business on the seventh day following the date
         on which notice of such meeting is first given to stockholders. Each
         such notice shall set forth: (a) the name and address of the
         stockholder who intends to make the nomination and of the person or
         persons to be nominated; (b) a representation that the stockholder is a
         holder of record of stock of the corporation entitled to vote at such
         meeting and intends to appear in person or by proxy at the meeting to
         nominate the person or persons specified in the notice; (c) a
         description of all arrangements or understandings between the
         stockholder and each nominee and any other person or persons (naming
         such person or persons) pursuant to which the nomination or nominations
         are to be made by the stockholder; (d) such other information regarding
         each nominee proposed by such stockholder as would be required to be
         included in a proxy statement filed pursuant to the proxy rules of the
         Securities and Exchange Commission, had the nominee been nominated, or
         intended to be nominated, by the board of directors; and (e) the

                                     - 5 -
<PAGE>   10
         consent of each nominee to serve as a director of the corporation if so
         elected. The chairman of the meeting may refuse to acknowledge the
         nomination of any person not made in compliance with the foregoing
         procedure.

                   8. (a) In addition to any affirmative vote required by law or
         this Restated Certificate of Incorporation or the By-Laws of the
         corporation, and except as otherwise expressly provided in Section
         8(b), a Business Transaction (as hereinafter defined) with, or proposed
         by or on behalf of, any Interested Stockholder (as hereinafter defined)
         or any Affiliate or Associate (as hereinafter defined) of any
         Interested Stockholder or any person who thereafter would be an
         Affiliate or Associate of such Interested Stockholder shall require the
         affirmative vote of not less than a majority of the votes entitled to
         be cast by the holders of all the then outstanding shares of Voting
         Stock (as hereinafter defined), voting together as a single class,
         excluding Voting Stock beneficially owned by such Interested
         Stockholder. Such affirmative vote shall be required notwithstanding
         the fact that no vote may be required, or that a lesser percentage or
         separate class vote may be specified by law or otherwise.

                      (b) The provisions of Section 8(a) shall not be applicable
         to any particular Business Transaction, and such Business Transaction
         shall require only such affirmative vote, if any, as is required by law
         or by any other provision of this Restated Certificate of Incorporation
         or the By-Laws of the corporation, or otherwise, if the Business
         Transaction shall have been approved (whether such approval is made
         prior to or subsequent to the acquisition of, or announcement or public
         disclosure of the intention to acquire, beneficial ownership of the
         Voting Stock that caused the Interested Stockholder to become an
         Interested Stockholder), either specifically or as a transaction which
         is within an approved category of transactions, by a majority of the
         Disinterested Directors (as hereinafter defined).


                      (c) The following definitions shall apply with respect to
         this Section 8:

                  (1) The term "Business Transaction" shall mean:

                      (A) any merger or consolidation of the corporation or any
                 Subsidiary (as hereinafter defined) with (i) any Interested
                 Stockholder or (ii) any other company (whether or not itself an
                 Interested Stockholder) which is or after such merger or
                 consolidation would be an Affiliate or Associate of an
                 Interested Stockholder; or

                                     - 6 -
<PAGE>   11
                      (B) any sale, lease, exchange, mortgage, pledge, transfer
                 or other disposition or security arrangement, investment, loan,
                 advance, guarantee, agreement to purchase, agreement to pay,
                 extension of credit, joint venture participation or other
                 arrangement (in one transaction or a series of transactions)
                 with or for the benefit of any Interested Stockholder or any
                 Affiliate or Associate of any Interested Stockholder involving
                 any assets, securities or commitments of the corporation, any
                 Subsidiary or any Interested Stockholder or any Affiliate or
                 Associate of any Interested Stockholder which (except for any
                 arrangement, whether as employee, consultant or otherwise,
                 other than as a director, pursuant to which any Interested
                 Stockholder or any Affiliate or Associate thereof shall,
                 directly or indirectly, have any control over or responsibility
                 for the management of any aspect of the business or affairs of
                 the corporation, with respect to which arrangements the value
                 tests set forth below shall not apply), together with all other
                 such arrangements (including all contemplated future events),
                 has an aggregate Fair Market Value (as hereinafter defined)
                 and/or involves aggregate commitments of $4,000,000 or more or
                 constitutes more than five percent of the book value of the
                 total assets (in the case of transactions involving assets or
                 commitments other than capital stock) or five percent of the
                 stockholders' equity (in the case of transactions in capital
                 stock) of the entity in question (the "Substantial Part"), as
                 reflected in the most recent fiscal year-end consolidated
                 balance sheet of such entity existing at the time the
                 stockholders of the corporation would be required to approve or
                 authorize the Business Transaction involving the assets,
                 securities and/or commitments constituting any Substantial
                 Part; or

                      (C) the adoption of any plan or proposal for the
                 liquidation or dissolution of the corporation or for any
                 amendment to the corporation's By-Laws; or

                      (D) any reclassification of securities (including any
                 reverse stock split), or recapitalization of the corporation,
                 or any merger or consolidation of the corporation with any of
                 its Subsidiaries or any other transaction (whether or not with
                 or otherwise involving an Interested Stockholder) that has the
                 effect, directly or indirectly, of increasing the proportionate
                 share of any class or series of Capital Stock, or any
                 securities convertible into Capital Stock or into equity
                 securities of any

                                     - 7 -
<PAGE>   12
                 Subsidiary, that is beneficially owned by any Interested
                 Stockholder or any Affiliate or Associate of any Interested
                 Stockholder; or

                      (E) any agreement, contract or other arrangement providing
                 for any one or more of the actions specified in the foregoing
                 clauses (A) to (D).

                  (2) The term "Capital Stock" shall mean all capital stock of
         the corporation authorized to be issued from time to time under this
         Restated Certificate of Incorporation, and the term "Voting Stock"
         shall mean all Capital Stock which by its terms may be voted on all
         matters submitted to stockholders of the corporation generally.

                  (3) The term "person" shall mean any individual, firm, company
         or other entity and shall include any group comprised of any person and
         any other person with whom such person or any Affiliate or Associate of
         such person has any agreement, arrangement or understanding, directly
         or indirectly, for the purpose of acquiring, holding, voting or
         disposing of Capital Stock.

                  (4) The term "Interested Stockholder" shall mean any person
         (other than the corporation or any Subsidiary and other than any
         profit-sharing, employee stock ownership or other employee benefit plan
         of the corporation or any Subsidiary or any trustee of or fiduciary
         with respect to any such plan when acting in such capacity) who (a) is
         or has announced or publicly disclosed a plan or intention to become
         the beneficial owner of Voting Stock representing ten percent (10%) or
         more of the votes entitled to be cast by the holders of all then
         outstanding shares of Voting Stock; or (b) is an Affiliate or Associate
         of the corporation and at any time within the two-year period
         immediately prior to the date in question was the beneficial owner of
         Voting Stock representing ten percent (10%) or more of the votes
         entitled to be cast by the holders of all then outstanding shares of
         Voting Stock.

                  (5) A person shall be a "beneficial owner" of any Capital
         Stock or shall "beneficially own" any Capital Stock (a) which such
         person or any of its Affiliates or Associates beneficially owns,
         directly or indirectly; (b) which such person or any of its Affiliates
         or Associates has or shares, directly or indirectly, (i) the right to
         acquire (whether such right is exercisable immediately or subject to
         the passage of time), pursuant to any agreement, arrangement or
         understanding or upon the exercise of conversion rights, exchange
         rights, warrants or options, or otherwise, or (ii) the right to vote
         pursuant to any


                                     - 8 -
<PAGE>   13
         agreement, arrangement or understanding; or (c) which is beneficially
         owned, directly or indirectly, by any other person with which such
         person or any of its Affiliates or Associates has or shares any
         agreement, arrangement or understanding for the purpose of acquiring,
         holding, voting or disposing of any shares of Capital Stock. For the
         purposes of determining whether a person is an Interested Stockholder
         pursuant to this Section 8, the number of shares of Capital Stock
         deemed to be outstanding shall include shares deemed beneficially owned
         by such person through application of this Section 8, but shall not
         include any other shares of Capital Stock that may be issuable pursuant
         to any agreement, arrangement or understanding, or upon exercise of
         conversion rights, warrants or options, or otherwise.

                  (6) An "Affiliate" of, or a person "Affiliated" with a
         specified person, is a person that directly, or indirectly through one
         or more intermediaries, controls, or is controlled by, or is under
         common control with, the person specified. The term "Associate" used to
         indicate a relationship with any person, means (1) any corporation or
         organization (other than the corporation or a majority-owned subsidiary
         of the corporation) of which such person is an officer or partner or
         is, directly or indirectly, the beneficial owner of ten percent (10%)
         or more of any class of equity securities, (2) any trust or other
         estate in which such person has a substantial beneficial interest or as
         to which such person serves as trustee or in a similar fiduciary
         capacity, or (3) any relative or spouse of such person, or any relative
         of such spouse who has the same home as such person or who is a
         director or officer of the corporation or any of its parents or
         subsidiaries.

                  (7) The term "Subsidiary" means any company of which a
         majority of any class of equity security is beneficially owned by the
         corporation; provided, however, that for the purposes of the definition
         of Interested Stockholder set forth in this Section 8, the term
         "Subsidiary" shall mean only a company of which a majority of each
         class of equity security is beneficially owned by the corporation.

                  (8) The term "Disinterested Director" means any member of the
         board of directors of the corporation (the "Board of Directors"), while
         such person is a member of the Board of Directors, who is not an
         Affiliate or Associate or representative or agent or employee of the
         Interested Stockholder and was a member of the Board of Directors prior
         to the time that the Interested Stockholder became an Interested
         Stockholder, and any successor of a

                                     - 9 -
<PAGE>   14
         Disinterested Director while such successor is a member of the Board of
         Directors, who is not an Affiliate or Associate or representative or
         agent or employee of the Interested Stockholder and is recommended or
         elected to succeed the Disinterested Director by a majority of
         Disinterested Directors.

                  (9) The term "Fair Market Value" means (a) in the case of
         cash, the amount of such cash; (b) in the case of stock, the highest
         closing sale price during the 30-day period immediately preceding the
         date in question of a share of such stock quoted on the National
         Association of Securities Dealers Automated Quotation System (NASDAQ),
         the New York Stock Exchange or such other market on which the
         corporation's shares are publicly traded, or if no such quotations are
         available, the fair market value on the date in question of a share of
         such stock as determined by a majority of the Disinterested Directors
         in good faith; and (c) in the case of property other than cash or
         stock, the fair market value of such property on the date in question
         as determined in good faith by a majority of the Disinterested
         Directors.

                      (d) A majority of the Disinterested Directors shall have
         the power and duty to determine for the purposes of this Section 8 on
         the basis of information known to them after reasonable inquiry, all
         questions arising under this Section 8, including, without limitation,
         (1) whether a person is an Interested Stockholder, (2) the number of
         shares of Capital Stock or other securities beneficially owned by any
         person, (3) whether a person is an Affiliate or Associate of another,
         (4) whether a Proposed Action is with, or proposed by, or on behalf of
         an Interested Stockholder or an Affiliate or Associate of an Interested
         Stockholder, (5) whether the assets that are the subject of any
         Business Transaction have, or the consideration to be received for the
         issuance or transfer of securities by the corporation or any Subsidiary
         in any Business Transaction has, an aggregate Fair Market Value of
         $4,000,000 or more, and (6) whether the assets or securities that are
         the subject of any Business Transaction constitute a Substantial Part.
         Any such determination made in good faith shall be binding and
         conclusive on all parties.

                      (e) Nothing contained in this Section 8 shall be construed
         to relieve any Interested Stockholder from any fiduciary obligation
         imposed by law.

                      (f) For the purposes of this Section 8, a Business
         Transaction or any proposal to amend, repeal or adopt any provision of
         this Restated Certificate of

                                     - 10 -
<PAGE>   15
         Incorporation inconsistent with this Section 8 (collectively, "Proposed
         Action") is presumed to have been proposed by, or on behalf of, an
         Interested Stockholder or an Affiliate or Associate of an Interested
         Stockholder or a person who thereafter would become such if (1) after
         the Interested Stockholder became such, the Proposed Action is proposed
         following the election of any director of the corporation who, with
         respect to such Interested Stockholder, would not qualify to serve as a
         Disinterested Director or (2) such Interested Stockholder, Affiliate,
         Associate or person votes for or consents to the adoption of any such
         Proposed Action, unless as to such Interested Stockholder, Affiliate,
         Associate or person a majority of the Disinterested Directors makes a
         good faith determination that such Proposed Action is not proposed by
         or on behalf of such Interested Stockholder, Affiliate, Associate or
         person, based on information known to them after reasonable inquiry.

                      (g) Notwithstanding any other provision of this Restated
         Certificate of Incorporation or the By-Laws of the corporation (and
         notwithstanding the fact that a lesser percentage or separate class
         vote may be specified by law, this Restated Certificate of
         Incorporation or the By-Laws of the corporation), any proposal to amend
         or repeal this Section 8 of this Restated Certificate of Incorporation
         or to amend, repeal or adopt any provision of this Restated Certificate
         of Incorporation inconsistent with this Section 8 which is proposed by
         or on behalf of an Interested Stockholder or an Affiliate or Associate
         of an Interested Stockholder shall require the affirmative vote of the
         holders of not less than a majority of the votes entitled to be cast by
         the holders of all the then outstanding shares of Voting Stock, voting
         together as a single class, excluding Voting Stock beneficially owned
         by such Interested Stockholder; provided, however, that this Section
         8(g) shall not apply to, and such majority vote shall not be required
         for, any amendment, repeal or adoption recommended by a majority of the
         Disinterested Directors.

                  9. Notwithstanding anything contained in this Restated
         Certificate of Incorporation to the contrary, the affirmative vote of
         the holders of at least eighty percent (80%) of the voting power of all
         shares of the corporation entitled to vote generally in the election of
         directors, voting together in a single class, shall be required to
         alter, amend or adopt any provision inconsistent with Sections 6 and 7
         hereof.

                  10. Whenever a compromise or arrangement is proposed between
         this corporation and its creditors or any class of them and/or between
         this corporation and its stockholders

                                     - 11 -
<PAGE>   16
         or any class of them, any court of equitable jurisdiction within the
         State of Delaware may, on the application in a summary way of this
         corporation or of any creditor or stockholder thereof or on the
         application of any receiver or receivers appointed for this corporation
         under the provisions of Section 291 of Title 8 of the Delaware Code or
         on the application of trustees in dissolution or of any receiver or
         receivers appointed for this corporation under the provisions of
         Section 279 of Title 8 of the Delaware Code order a meeting of the
         creditors or class of creditors, and/or of the stockholders or class of
         stockholders of this corporation, as the case may be, to be summoned in
         such manner as the said court directs. If a majority in number
         representing three-fourths in value of the creditors or class of
         creditors, and/or of the stockholders or class of stockholders of this
         corporation, as the case may be, agree to any compromise or arrangement
         and to any reorganization of this corporation as consequence of such
         compromise or arrangement, the said compromise or arrangement and the
         said reorganization shall, if sanctioned by the court to which the said
         application has been made, be binding on all the creditors or class of
         creditors, and/or on all the stockholders or class of stockholders, of
         this corporation, as the case may be, and also on this corporation.

                  11. The corporation reserves the right to amend, alter, change
         or repeal any provision contained in this Restated Certificate of
         Incorporation, in the manner now or hereafter prescribed by statute,
         and all rights conferred upon the stockholders herein are granted
         subject to this reservation."

         (d) This Restated Certificate of Incorporation was duly adopted by vote
of the stockholders in accordance with Sections 242 and 245 of the General
Corporation Law of the State of Delaware.

         (e) This Restated Certificate of Incorporation shall be effective on
June 9, 1986.


                                     - 12 -
<PAGE>   17
IN WITNESS WHEREOF, said Trenwick Group Inc. has caused this certificate to be
signed by James F. Billett, Jr., its Chairman of the Board of Directors, and
attested by Barbara Freed, its Secretary this 13th day of May, 1986.

                                                      TRENWICK GROUP INC.
                                                     James F. Billett, Jr.

                                                By /s/ James F. Billett, Jr.
                                                   ----------------------------

ATTEST:

By /s/ Barbara R. Freed
- ---------------------------
        Secretary

                                     - 13 -

<PAGE>   1
                               TRENWICK GROUP INC.
                Exhibit 11.0 -- COMPUTATION OF EARNINGS PER SHARE
                    (in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                   Income Before Extraordinary Item                 Net Income
                                                         Three Months Ended                     Three Months Ended
                                                               June 30,                             June 30,
                                                       1997                 1996             1997                1996
                                                       ----                 ----             ----                ----
<S>                                                <C>                    <C>               <C>               <C>
INCOME AVAILABLE TO COMMON
STOCKHOLDERS:
Income before extraordinary item/net
income (primary)                                      $  8,593            $8,327             $8,593            $8,327
Add interest on convertible debentures
converted February 20, 1997 into
common stock, net of applicable taxes                        -               589                  -               589
                                                      --------            ------             ------            ------
Income available (supplemental)                          8,593             8,916              8,593             8,916
Add interest on convertible debentures
redeemed when dilutive                                       -               467                   -              467
                                                      --------            ------             ------            ------
Income available (fully diluted)                      $  8,593            $9,383             $8,593            $9,383
                                                      ========            ======             ======            ======

WEIGHTED AVERAGE SHARES OF
COMMON STOCK OUTSTANDING:
Average common shares outstanding                       11,937            10,010             11,937            10,010
Equivalent shares associated with
employee stock options                                     177               216                177               216
                                                      --------            ------             ------            ------
Weighted average common and common
equivalent shares (primary)                             12,114            10,226             12,114            10,226
Additional shares associated with
convertible debentures converted
February 20, 1997                                            -             1,784                   -            1,784
                                                      --------            ------             ------            ------
Weighted average common and common
equivalent shares (supplemental)                        12,114            12,010             12,114            12,010
Additional shares associated with
convertible debentures redeemed when
dilutive                                                     -             1,417                  -             1,417
Additional equivalent shares associated                      
with employee stock options                                  -                16                  -                16
                                                      --------            ------             ------            ------
Weighted average common and common
equivalent shares
(fully diluted)                                         12,114            13,443             12,114            13,443
                                                      --------            ------             ------            ------
PER SHARE AMOUNTS:
Primary                                                   $.71              $.81               $.71              $.81
                                                          ====              ====               ====              ====
Supplemental                                              $.71              $.74               $.71              $.74
                                                          ====              ====               ====              ====
Fully diluted                                             $.71              $.70               $.71              $.70
                                                          ====              ====               ====              ====
</TABLE>
<PAGE>   2
                               TRENWICK GROUP INC.
                Exhibit 11.0 -- COMPUTATION OF EARNINGS PER SHARE
                    (in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                              Income Before Extraordinary Item             Net Income
                                                     Six Months Ended                   Six Months Ended
                                                         June 30,                           June 30,
                                                  1997              1996               1997            1996
                                                  ----              ----               ----            ----
<S>                                           <C>                <C>                <C>              <C>
INCOME AVAILABLE TO COMMON                                                        
STOCKHOLDERS:                                                                     
Income before extraordinary item/net                                              
income (primary)                                 $18,394          $16,509            $17,357          $16,509
Add interest on convertible debentures                                            
converted February 20, 1997 into                                                  
common stock, net of applicable taxes                322            1,177                322            1,177
                                                 -------          -------            -------          -------
Income available (supplemental)                   18,716           17,686             17,679           17,686
Add interest on convertible debentures                                            
redeemed when dilutive                               256              935                 --              935
                                                 -------          -------            -------          -------
Income available (fully diluted)                 $18,972          $18,621            $17,679          $18,621
                                                 =======          =======            =======          =======
                                                                                  
WEIGHTED AVERAGE SHARES OF                                                        
COMMON STOCK OUTSTANDING:                                                         
Average common shares outstanding                 11,415            9,951             11,415            9,951
Equivalent shares associated with                                                 
employee stock options                               178              276                178              276
                                                 -------          -------            -------          -------
Weighted average common and common                                                
equivalent shares (primary)                       11,593           10,227             11,593           10,227
Additional shares associated with                                                 
convertible debentures converted                                                  
February 20, 1997                                    503            1,784                503            1,784
                                                 -------          -------            -------          -------
Weighted average common and common                                                
equivalent shares (supplemental)                                                  
Additional shares associated with                 12,096           12,011             12,096           12,011
convertible debentures redeemed when                                              
dilutive                                                                          
Additional equivalent shares associated              399            1,417                 --            1,417
with employee stock options                                                       
Weighted average common and common                    90                2                 90                2
                                                 -------          -------            -------          -------
equivalent shares                                                                 
(fully diluted)                                                                   
                                                  12,585           13,430             12,186           13,430
                                                 =======          =======            =======          =======
PER SHARE AMOUNTS:                                                                
Primary                                                                           
Supplemental                                       $1.59            $1.61              $1.50            $1.61
                                                   =====            =====              =====            =====
Fully diluted                                      $1.55            $1.47              $1.46            $1.47
                                                   =====            =====              =====            =====
                                                   $1.51            $1.39              $1.45            $1.39
                                                   =====            =====              =====            =====
</TABLE>

<TABLE> <S> <C>

<ARTICLE> 7
<LEGEND>
This schedule contains summary financial information extracted from the
Financial Statements contained in the Form 10-Q for the six months ended June
30, 1997 for Trenwick Group Inc.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<DEBT-HELD-FOR-SALE>                           790,075
<DEBT-CARRYING-VALUE>                                0
<DEBT-MARKET-VALUE>                                  0
<EQUITIES>                                      36,463
<MORTGAGE>                                           0
<REAL-ESTATE>                                        0
<TOTAL-INVEST>                                 826,538
<CASH>                                          10,012
<RECOVER-REINSURE>                              79,981
<DEFERRED-ACQUISITION>                          23,836
<TOTAL-ASSETS>                               1,038,016
<POLICY-LOSSES>                                496,062
<UNEARNED-PREMIUMS>                             83,374
<POLICY-OTHER>                                       0
<POLICY-HOLDER-FUNDS>                                0
<NOTES-PAYABLE>                                      0
                          110,000
                                          0
<COMMON>                                         1,194
<OTHER-SE>                                     335,472
<TOTAL-LIABILITY-AND-EQUITY>                 1,038,016
                                     101,019
<INVESTMENT-INCOME>                             23,852
<INVESTMENT-GAINS>                               1,916
<OTHER-INCOME>                                      10
<BENEFITS>                                      58,290
<UNDERWRITING-AMORTIZATION>                     31,957
<UNDERWRITING-OTHER>                            12,701
<INCOME-PRETAX>                                 23,849
<INCOME-TAX>                                     5,455
<INCOME-CONTINUING>                             18,394
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                  1,037
<CHANGES>                                            0
<NET-INCOME>                                    17,357
<EPS-PRIMARY>                                     1.50
<EPS-DILUTED>                                     1.45
<RESERVE-OPEN>                                       0
<PROVISION-CURRENT>                                  0
<PROVISION-PRIOR>                                    0
<PAYMENTS-CURRENT>                                   0
<PAYMENTS-PRIOR>                                     0
<RESERVE-CLOSE>                                      0
<CUMULATIVE-DEFICIENCY>                              0
        

</TABLE>


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