<Page>


================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q/A

(Mark One)
[X]   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the quarterly period ended March 31, 2001

                                       Or

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

      For the transition period ___________________ to _____________________

Commission file number:  0-26456

                             ARCH CAPITAL GROUP LTD.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<Table>
                                                                   
                           Bermuda                                               Not Applicable
(State or other jurisdiction of incorporation or organization)        (I.R.S. Employer Identification No.)

             20 Horseneck Lane
          Greenwich, Connecticut                                                    06830
(Address of principal executive offices)                                          (Zip Code)
</Table>

Registrant's telephone number, including area code:     (203) 862-4300


- --------------------------------------------------------------------------------
     (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 shares.

<Table>
<Caption>
              CLASS                      OUTSTANDING AT JUNE 30, 2001
              -----                      ----------------------------
                                                
   Common Shares, $.01 par value                   12,863,079
</Table>


================================================================================



<Page>


                             ARCH CAPITAL GROUP LTD.

                                      INDEX

<Table>
<Caption>
                                                                                             PAGE NO.
                                                                                           -------------
                                                                                          
PART I.  FINANCIAL INFORMATION

ITEM 1 -- CONSOLIDATED FINANCIAL STATEMENTS

            Review Report of Independent Accountants                                            1

            Consolidated Balance Sheet                                                          2
              March 31, 2001 and December 31, 2000

            Consolidated Statement of Income                                                    3
              For the three month periods ended March 31, 2001 and 2000

            Consolidated Statement of Shareholders' Equity and Comprehensive Income             4
              For the three month periods ended March 31, 2001 and 2000

            Consolidated Statement of Cash Flows                                                5
              For the three month periods ended March 31, 2001 and 2000

            Notes to Consolidated Financial Statements                                          6

ITEM 2 -- MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
            AND RESULTS OF OPERATIONS                                                           20

ITEM 3-- QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                             26

PART II.  OTHER INFORMATION

ITEM 1-- LEGAL PROCEEDINGS                                                                      27

ITEM 6-- EXHIBITS AND REPORTS ON FORM 8-K                                                       27
</Table>




<Page>


RESTATEMENT

         The purpose of this Form 10-Q/A is to restate the first quarter 2001
and 2000 financial statements and related disclosures of Arch Capital Group Ltd.
(the "Company") to reflect the following:

         On June 22, 2001, the Company completed its acquisition of all of the
remaining ownership interests in one of its investee companies, Arch Risk
Transfer Services Ltd. ("ART Services"), formerly known as Altus Holdings, Ltd.
After the Company's acquisition of its initial 27.9% ownership interest in ART
Services in March 1998, the investment was carried at its estimated fair value
from the initial purchase through March 31, 2001 in accordance with generally
accepted accounting principles. The Company accounted for its initial interest
in ART Services under "fair value" because the Company did not have the ability
to exercise significant influence over this investment due to the Company's
limited voting and consent rights. Upon the closing of the Company's acquisition
of ART Services, the Company was required under generally accepted accounting
principles governing a "step acquisition" of an investee company to
retroactively adopt the equity method of accounting for its original 27.9%
ownership interest in ART Services for the periods prior to the acquisition and
to restate its historical financial results. The required change to the equity
method of accounting for this investment resulted in a reduction in the
Company's book value at March 31, 2001 in the amount of $3.1 million, or $0.24
per share and decreased net income by $148,000, or $0.01 per share, for the 2001
first quarter. Restating net income previously reported for the 2000 first
quarter resulted in an increase in net income of $1.9 million, or $0.13 per
share.

         The principal effects of these changes on the March 31, 2001 and 2000
financial statements are presented below and in note 4 of the notes accompanying
the consolidated financial statements.

<Table>
<Caption>
                                                        THREE MONTHS ENDED                     THREE MONTHS ENDED
                                                           MARCH 31, 2001                         MARCH 31, 2000
                                                -----------------------------------    ------------------------------------
                                                      AS           AS PREVIOUSLY              AS             AS PREVIOUSLY
                                                   RESTATED           REPORTED             RESTATED            REPORTED
                                                ---------------    ----------------    -----------------    ---------------
                                                                                                    
Net investment gains (losses)                        $9,004              $9,004              $32,473            $29,300
Equity in net income (loss) of investees                888               1,036                 (220)                46
Income before income taxes                           11,299              11,447               21,350             18,443
Income tax expense                                    3,306               3,306               13,653             12,635
Net income                                           $7,993              $8,141               $7,697             $5,808

Basic and diluted net income (loss) per
share                                                 $0.63               $0.64                $0.50              $0.37
</Table>

         For purposes of this Form 10-Q/A, and in accordance with Rule 12b-15
under the Securities and Exchange Act of 1934, as amended, the Company has
amended and restated in its entirety each item of the 2001 first quarter Form
10-Q which has been affected by the restatement. In order to preserve the nature
and character of the disclosures originally set forth in the 2001 first quarter
Form 10-Q filed on May 15, 2001, this Form 10-Q/A does not reflect events
occurring after the filing of the original Form 10-Q, or modify or update those
disclosures in any way, except as required to reflect the effects of the
restatement.


<Page>


                        REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Shareholders of
Arch Capital Group Ltd.:

We have reviewed the accompanying consolidated balance sheet of Arch Capital
Group Ltd. (formerly known as Risk Capital Holdings, Inc.) and its subsidiaries
as of March 31, 2001, and the related consolidated statements of income, of
changes in shareholders' equity and comprehensive income and of cash flows for
each of the three-month periods ended March 31, 2001 and 2000. These financial
statements are the responsibility of the Company's management.

We conducted our review in accordance with standards established by the American
Institute of Certified Public Accountants. A review of interim financial
information consists principally of applying analytical procedures to financial
data and making inquiries of persons responsible for financial and accounting
matters. It is substantially less in scope than an audit conducted in accordance
with generally accepted auditing standards, the objective of which is the
expression of an opinion regarding the financial statements taken as a whole.
Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should
be made to the accompanying consolidated interim financial information for it to
be in conformity with accounting principles generally accepted in the United
States of America.

We previously audited in accordance with auditing standards generally accepted
in the United States of America, the consolidated balance sheet as of December
31, 2000, and the related consolidated statements of income and comprehensive
income, of changes in shareholders' equity, and of cash flows for the year then
ended (not presented herein), and in our report dated February 6, 2001, we
expressed an unqualified opinion on those consolidated financial statements. In
our opinion, the information set forth in the accompanying condensed
consolidated balance sheet as of December 31, 2000, is fairly stated in all
material respects in relation to the consolidated balance sheet from which it
has been derived.

As discussed in Note 4, the accompanying consolidated financial statements have
been restated.

/s/ PricewaterhouseCoopers

Hamilton, Bermuda
May 14, 2001, except as to
Note 4, which is as of August 6, 2001








                                       1
<Page>


<Table>
<Caption>
                                          ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                                 CONSOLIDATED BALANCE SHEET
                                              (IN THOUSANDS, EXCEPT SHARE DATA)

                                                                                   (UNAUDITED)
                                                                                     MARCH 31,              DECEMBER 31,
                                                                                       2001                    2000
                                                                                 ------------------      ------------------
                                                                                    (Restated)              (Restated)
                                                                                                           
ASSETS
Investments:
Fixed maturities (amortized cost:  2001, $90,678; 2000, $37,849)                         $90,400                 $38,475
Publicly traded equity securities (cost:  2001, $16,859; 2000, $24,987)                   28,224                  51,322
Privately held securities (cost:  2001, $49,274; 2000 $57,913)                            49,027                  56,418
Securities held in escrow (amortized cost:  2001, $21,105; 2000, $20,887)                 21,373                  20,970
Short-term investments                                                                    72,421                  97,387
                                                                                 ------------------      ------------------
Total investments                                                                        261,445                 264,572
                                                                                 ------------------      ------------------

Cash                                                                                      20,290                  11,481
Accrued investment income                                                                  2,405                   1,432
Premiums receivable                                                                       39,459
Unpaid claims and claims expenses recoverable                                             34,520
Prepaid reinsurance premiums                                                              31,735
Reinsurance balances receivable                                                            9,654
Goodwill                                                                                  20,381                   6,111
Deferred income tax asset                                                                  7,980                   8,192
Deferred policy acquisition costs                                                          2,485
Other assets                                                                               6,829                   4,119
                                                                                 ------------------      ------------------
TOTAL ASSETS                                                                            $437,183                $295,907
                                                                                 ==================      ==================

LIABILITIES
Claims and claims expenses                                                               $53,413
Unearned premiums                                                                         44,133
Reinsurance balances payable                                                              34,282
Reserve for contingent loss of escrowed assets                                            15,000                 $15,000
Investment accounts payable                                                                5,792
Other liabilities                                                                         15,135                   8,608
                                                                                 ------------------      ------------------
TOTAL LIABILITIES                                                                        167,755                  23,608
                                                                                 ------------------      ------------------

COMMITMENTS AND CONTINGENCIES

SHAREHOLDERS' EQUITY
Preferred shares, $.01 par value:
50,000,000 shares authorized (none issued)
Common shares, $.01 par value:
200,000,000 shares authorized
(issued:  2001, 12,831,860; 2000, 12,708,818)                                                128                     127
Additional paid-in capital                                                               289,877                 288,016
Deferred compensation under share award plan                                              (1,594)                   (341)
Retained earnings (deficit)                                                              (25,633)                (33,626)
Less treasury shares, at cost (2001, 2,981)                                                  (48)
Accumulated other comprehensive income consisting of unrealized
appreciation of investments, net of income tax                                             6,698                  18,123
                                                                                 ------------------      ------------------
TOTAL SHAREHOLDERS' EQUITY                                                               269,428                 272,299
                                                                                 ------------------      ------------------
Total Liabilities & Shareholders' Equity                                                $437,183                $295,907
                                                                                 ==================      ==================
                                       See Notes to Consolidated Financial Statements
</Table>



                                                             2
<Page>



<Table>
<Caption>

                              ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                  CONSOLIDATED STATEMENT OF INCOME
                                 (IN THOUSANDS, EXCEPT SHARE DATA)

                                                                       (UNAUDITED)
                                                                   THREE MONTHS ENDED
                                                                        MARCH 31,
                                                        ------------------------------------------
                                                              2001                    2000
                                                        ------------------      ------------------
                                                           (Restated)              (Restated)
                                                                                  
REVENUES
Net premiums written                                             $2,837                 $52,889
(Increase) decrease in unearned premiums                         (1,204)                  5,273
                                                        ------------------      ------------------
Net premiums earned                                               1,633                  58,162
Net investment income                                             3,160                   5,290
Net investment gains                                              9,004                  32,473
Equity in net income (loss) of investees                            888                    (220)
Fee income                                                        1,715
Net commission income                                               482
                                                        ------------------      ------------------
TOTAL REVENUES                                                   16,882                  95,705

EXPENSES
Claims and claims expenses                                        1,545                  53,875
Commissions and brokerage                                                                16,753
Other operating expenses                                          4,038                   2,568
Foreign exchange loss                                                                     1,159
                                                        ------------------      ------------------
TOTAL EXPENSES                                                    5,583                  74,355

INCOME BEFORE INCOME TAXES                                       11,299                  21,350

Federal income taxes:
Current                                                             201                     264
Deferred                                                          3,105                  13,389
                                                        ------------------      ------------------
Income tax expense                                                3,306                  13,653
                                                        ------------------      ------------------

NET INCOME                                                       $7,993                  $7,697
                                                        ==================      ==================

AVERAGE SHARES OUTSTANDING
Basic                                                        12,786,631              15,517,163
Diluted                                                      12,792,448              15,518,341

Basic and diluted net income per share                            $0.63                   $0.50
                        See Notes to Consolidated Financial Statements
</Table>



                                                 3
<Page>


<Table>
<Caption>
                                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME
                                                 (IN THOUSANDS)

                                                                                               (UNAUDITED)
                                                                                           THREE MONTHS ENDED,
                                                                                                MARCH 31,
                                                                                         ----------------------
                                                                                            2001        2000
                                                                                         ----------  ----------
                                                                                         (Restated)  (Restated)
                                                                                                
COMMON SHARES
Balance at beginning of year                                                             $     127    $     171
Common shares issued                                                                             1
                                                                                         ----------  ----------
Balance at end of period                                                                       128          171
                                                                                         ----------  ----------

ADDITIONAL PAID-IN CAPITAL
Balance at beginning of year                                                               288,016      342,034
Common shares issued                                                                         1,861          (22)
                                                                                         ----------  ----------
Balance at end of period                                                                   289,877      342,012
                                                                                         ----------  ----------

DEFERRED COMPENSATION UNDER SHARE AWARD PLAN
Balance at beginning of year                                                                  (341)        (317)
Restricted common shares (issued) cancelled                                                 (1,612)          22
Compensation expense recognized                                                                359           71
                                                                                         ----------  ----------
Balance at end of period                                                                    (1,594)        (224)
                                                                                         ----------  ----------

RETAINED EARNINGS (DEFICIT)
Balance at beginning of year, as previously reported                                       (30,916)     (22,175)
Adjustment to retroactively adopt the equity method of accounting
for the original investment in ART Services                                                 (2,710)      (3,439)
                                                                                         ----------  ----------
Balance at beginning of year, as adjusted                                                  (33,626)     (25,614)
Net income (loss)                                                                            7,993        7,697
                                                                                         ----------  ----------
Balance at end of period                                                                   (25,633)     (17,917)
                                                                                         ----------  ----------

TREASURY SHARES, AT COST
Balance at beginning of year                                                                               (387)
Purchase of treasury shares                                                                    (48)     (59,210)
                                                                                         ----------  ----------
Balance at end of period                                                                       (48)     (59,597)
                                                                                         ----------  ----------

ACCUMULATED OTHER COMPREHENSIVE INCOME
UNREALIZED APPRECIATION OF INVESTMENTS, NET OF INCOME TAX
Balance at beginning of year, as previously reported                                        18,432       27,188
Adjustment to retroactively adopt the equity method of accounting
for the original investment in ART Services                                                   (309)        (745)
                                                                                         ----------  ----------
Balance at beginning of year, as adjusted                                                   18,123       26,443
Change in unrealized appreciation (depreciation)                                           (11,425)     (43,930)
                                                                                         ----------  ----------
Balance at end of period                                                                     6,698      (17,487)
                                                                                         ----------  ----------

TOTAL SHAREHOLDERS' EQUITY                                                               $ 269,428    $ 246,958
                                                                                         ==========   ==========

COMPREHENSIVE INCOME (LOSS)
  Net income                                                                             $   7,993    $   7,697
  Other comprehensive income, net of tax
    Unrealized appreciation (depreciation) of investments:
      Unrealized holding gains (losses) arising during period                               (5,273)     (22,823)
      Less: reclassification adjustment for net realized gains included in net income       (6,152)     (21,107)
                                                                                         ----------  ----------
  Other comprehensive income (loss)                                                        (11,425)     (43,930)
                                                                                         ----------  ----------
Comprehensive Income (Loss)                                                              ($  3,432)   ($ 36,233)
                                                                                         ==========   ==========
                                 See Notes to Consolidated Financial Statements
</Table>


                                                       4
<Page>

                            ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                              CONSOLIDATED STATEMENT OF CASH FLOWS
                                         (IN THOUSANDS)

<Table>
<Caption>
                                                                              (UNAUDITED)
                                                                          THREE MONTHS ENDED,
                                                                                MARCH 31,
                                                                        -----------------------
                                                                           2001         2000
                                                                        ----------   ----------
                                                                        (Restated)   (Restated)
                                                                               
OPERATING ACTIVITIES
Net income                                                              $   7,993    $   7,697
  Adjustments to reconcile net income
  to net cash provided by operating activities:
   Liability for claims and claims expenses                                   236       13,743
   Unearned premiums                                                        2,771       (5,274)
   Premiums receivable                                                     (2,478)       3,949
   Accrued investment income                                                 (820)         790
   Reinsurance recoverables                                                (1,542)      (6,645)
   Reinsurance balances payable                                             1,103        1,377
   Deferred policy acquisition costs                                         (241)       1,300
   Net investment (gains)/losses                                           (9,004)     (29,300)
   Deferred income tax asset                                                  213       12,371
   Other liabilities                                                       (1,820)      (3,092)
   Other items, net                                                         3,895          390
                                                                        ----------   ----------
NET CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES                          306       (2,694)
                                                                        ----------   ----------

INVESTING ACTIVITIES
Purchases of fixed maturity investments                                   (46,708)     (83,092)
Sales of fixed maturity investments                                        13,117      136,903
Purchases of equity securities                                                         (12,119)
Sales of equity securities                                                 17,986       26,331
Net (purchases)/sales of short-term investments                            23,954      (66,982)
Sale or disposal (purchases) of furniture and equipment                       (22)           6
Acquisition of American Independent Insurance Holding Company, net of
     cash acquired                                                            224
                                                                        ----------   ----------
NET CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES                        8,551        1,047
                                                                        ----------   ----------

FINANCING ACTIVITIES
Common shares issued                                                        1,862          (22)
Purchase of treasury shares                                                   (48)       3,637
Deferred compensation on restricted shares                                 (1,612)          22
Other equity compensation                                                    (250)
                                                                        ----------   ----------
NET CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES                          (48)       3,637
                                                                        ----------   ----------

Increase in cash                                                            8,809        1,990
Cash beginning of year                                                     11,481        9,457
                                                                        ----------   ----------
CASH END OF PERIOD                                                      $  20,290    $  11,447
                                                                        ==========   ==========
                         See Notes to Consolidated Financial Statements
</Table>



                                               5
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.     ORGANIZATION

       Arch Capital Group Ltd. ("ACGL"), a Bermuda company, is a diversified
financial services holding company, with an emphasis on the insurance sector.
ACGL was formed in September 2000 to accomplish the internal reorganization
transaction described below involving Arch Capital Group (U.S.) Inc. (formerly
known as (i) "Risk Capital Holdings, Inc." from March 1995 to May 8, 2000 and
(ii) "Arch Capital Group Ltd." from May 8, 2000 to November 8, 2000), a Delaware
holding company formed in March 1995 ("Arch-U.S."). The common shares of ACGL
are traded on the Nasdaq National Market under the symbol "ACGL."

      On November 8, 2000, following the approval of Arch-U.S.'s shareholders,
Arch-U.S. completed an internal reorganization that resulted in Arch-U.S.
becoming a wholly owned subsidiary of ACGL. ACGL performs the holding company
functions previously conducted by Arch-U.S., and the shareholders of Arch-U.S.
have become the shareholders of ACGL. Prior to the reorganization, ACGL had no
significant assets or capitalization and had not engaged in any business or
prior activities other than in connection with the reorganization. Arch-U.S.
remains the holding company for certain United States subsidiaries.

       Prior to May 5, 2000, Arch-U.S. provided reinsurance and other forms of
capital for insurance companies through its wholly owned subsidiary, Arch
Reinsurance Company ("Arch Re"), a Nebraska corporation formed in 1995 under the
original name of "Risk Capital Reinsurance Company." On May 5, 2000, Arch-U.S.
sold the reinsurance operations of Arch Re to Folksamerica Reinsurance Company
("Folksamerica").

       As used below, the "Company" means ACGL and its subsidiaries, except when
referring to periods prior to November 8, 2000, when it means Arch-U.S. and its
subsidiaries. Similarly, "Common Shares" means the common shares, par value U.S.
$0.01, of ACGL, except when referring to periods prior to November 8, 2000, when
it means the common stock of Arch-U.S.

       Class A warrants to purchase an aggregate of 2,531,079 Common Shares and
Class B warrants to purchase an aggregate of 1,920,601 Common Shares were issued
in connection with the direct sales of Common Shares. Class A warrants are
immediately exercisable at $20 per share and expire September 19, 2002. Class B
warrants are exercisable at $20 per share during the seven-year period
commencing September 19, 1998, provided that the Common Shares have traded at or
above $30 per share for 20 out of 30 consecutive trading days.

2.     GENERAL

       The interim consolidated financial statements have been prepared in
conformity with generally accepted accounting principles ("GAAP") in the United
States and include the accounts of ACGL, Arch-U.S., Hales & Company Inc.
("Hales"), American Independent Insurance Holding Company ("AIHC"), Arch Re and
Cross River Insurance Company ("Cross River"). All intercompany transactions and
balances have been eliminated in consolidation. The preparation of financial
statements in conformity with GAAP requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates. In the
opinion of management, the accompanying interim consolidated financial
statements reflect all adjustments necessary (consisting of normal recurring
accruals) for a fair presentation of results on an interim basis. These
consolidated financial statements should be read in conjunction with the 2000
consolidated financial statements and related notes contained in the Company's
Annual Report on Form 10-K/A for the fiscal year ended December 31, 2000.



                                       6
<Page>

                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


3.     RECLASSIFICATIONS

       Certain amounts in the 2000 consolidated financial statements have been
reclassified to conform to the 2001 presentation. Such reclassifications had no
effect on the Company's net income, shareholders' equity or cash flows.

4.     RESTATEMENT

       On June 22, 2001, the Company completed its acquisition of all of the
remaining ownership interests in one of its investee companies, Arch Risk
Transfer Services Ltd. ("ART Services"), formerly known as Altus Holdings, Ltd.
After the Company's acquisition of its initial 27.9% ownership interest in ART
Services in March 1998, the investment was carried at its estimated fair value
from the initial purchase through March 31, 2001 in accordance with generally
accepted accounting principles. The Company accounted for its initial interest
in ART Services under "fair value" because the Company did not have the ability
to exercise significant influence over this investment due to the Company's
limited voting and consent rights. Upon the closing of the Company's acquisition
of ART Services, the Company was required under generally accepted accounting
principles governing a "step acquisition" of an investee company to
retroactively adopt the equity method of accounting for its original 27.9%
ownership interest in ART Services for the periods prior to the acquisition and
to restate its historical financial results. Such restatement resulted in a
reduction in the Company's book value at March 31, 2001 in the amount of $3.1
million, or $0.24 per share and decreased net income by $148,000, or $0.01 per
share, for the 2001 first quarter. Restating net income previously reported for
the 2000 first quarter resulted in an increase in net income of $1.9 million, or
$0.13 per share.

       The effects of these changes on the accompanying financial statements are
set forth below.



                                       7
<Page>


<Table>
<Caption>
                                          ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                         NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


4.     RESTATEMENT (CONT'D.)


CONSOLIDATED BALANCE SHEET:                                                                   MARCH 31, 2001
                                                                                 ------------------------------------------
(IN THOUSANDS, EXCEPT SHARE DATA)                                                       AS                 AS PREVIOUSLY
                                                                                     RESTATED                REPORTED
                                                                                 ------------------      ------------------
                                                                                                           
ASSETS
Investments:
Fixed maturities (amortized cost:  $90,678)                                              $90,400                 $90,400
Publicly traded equity securities (cost:  $16,859)                                        28,224                  28,224
Privately held securities (cost:  restated, $49,274; original, $52,132)                   49,027                  52,080
Securities held in escrow (amortized cost:  $21,105)                                      21,373                  21,373
Short-term investments                                                                    72,421                  72,421
                                                                                 ------------------      ------------------
Total investments                                                                        261,445                 264,498
                                                                                 ------------------      ------------------

Cash                                                                                      20,290                  20,290
Accrued investment income                                                                  2,405                   2,405
Premiums receivable                                                                       39,459                  39,459
Unpaid claims and claims expenses recoverable                                             34,520                  34,520
Prepaid reinsurance premiums                                                              31,735                  31,735
Reinsurance balances receivable                                                            9,654                   9,654
Goodwill                                                                                  20,381                  20,381
Deferred income tax asset                                                                  7,980                   7,980
Deferred policy acquisition costs                                                          2,485                   2,485
Other assets                                                                               6,829                   6,829
                                                                                 ------------------      ------------------
TOTAL ASSETS                                                                            $437,183                $440,236
                                                                                 ==================      ==================

LIABILITIES
Claims and claims expenses                                                               $53,413                 $53,413
Unearned premiums                                                                         44,133                  44,133
Reinsurance balances payable                                                              34,282                  34,282
Reserve for contingent loss of escrowed assets                                            15,000                  15,000
Investment accounts payable                                                                5,792                   5,792
Other liabilities                                                                         15,135                  15,135
                                                                                 ------------------      ------------------
TOTAL LIABILITIES                                                                        167,755                 167,755
                                                                                 ------------------      ------------------

COMMITMENTS AND CONTINGENCIES

SHAREHOLDERS' EQUITY
Preferred shares, $.01 par value:
50,000,000 shares authorized (none issued)
Common shares, $.01 par value:
200,000,000 shares authorized
(issued:  12,831,860)                                                                        128                     128
Additional paid-in capital                                                               289,877                 289,877
Deferred compensation under share award plan                                              (1,594)                 (1,594)
Retained earnings (deficit)                                                              (25,633)                (22,775)
Less treasury shares, at cost (2,981 shares)                                                 (48)                    (48)
Accumulated other comprehensive income consisting of unrealized
appreciation of investments, net of income tax                                             6,698                   6,893
                                                                                 ------------------      ------------------
TOTAL SHAREHOLDERS' EQUITY                                                               269,428                 272,481
                                                                                 ------------------      ------------------
Total Liabilities & Shareholders' Equity                                                $437,183                $440,236
                                                                                 ==================      ==================
</Table>




                                                             8
<Page>




<Table>
<Caption>
                                          ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                         NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



4.     RESTATEMENT (CONT'D.)

CONSOLIDATED BALANCE SHEET:                                                                  DECEMBER 31, 2000
                                                                                 ------------------------------------------
(IN THOUSANDS, EXCEPT SHARE DATA)                                                       AS                 AS PREVIOUSLY
                                                                                     RESTATED                REPORTED
                                                                                 ------------------      ------------------
                                                                                                           
ASSETS
Investments:
Fixed maturities (amortized cost:  $37,849)                                              $38,475                 $38,475
Publicly traded equity securities (cost:  $24,987)                                        51,322                  51,322
Privately held securities (cost:  restated, $57,913; original, $60,623)                   56,418                  59,437
Securities held in escrow (amortized cost:  $20,887)                                      20,970                  20,970
Short-term investments                                                                    97,387                  97,387
                                                                                 ------------------      ------------------
Total investments                                                                        264,572                 267,591
                                                                                 ------------------      ------------------

Cash                                                                                      11,481                  11,481
Accrued investment income                                                                  1,432                   1,432
Premiums receivable
Unpaid claims and claims expenses recoverable
Prepaid reinsurance premiums
Reinsurance balances receivable
Goodwill                                                                                   6,111                   6,111
Deferred income tax asset                                                                  8,192                   8,192
Deferred policy acquisition costs
Other assets                                                                               4,119                   4,119
                                                                                 ------------------      ------------------
TOTAL ASSETS                                                                            $295,907                $298,926
                                                                                 ==================      ==================

LIABILITIES
Claims and claims expenses
Unearned premiums
Reinsurance balances payable
Reserve for contingent loss of escrowed assets                                           $15,000                 $15,000
Investment accounts payable
Other liabilities                                                                          8,608                   8,608
                                                                                 ------------------      ------------------
TOTAL LIABILITIES                                                                         23,608                  23,608
                                                                                 ------------------      ------------------

COMMITMENTS AND CONTINGENCIES

SHAREHOLDERS' EQUITY
Preferred shares, $.01 par value:
50,000,000 shares authorized (none issued)
Common shares, $.01 par value:
200,000,000 shares authorized
(issued:  12,708,818)                                                                        127                     127
Additional paid-in capital                                                               288,016                 288,016
Deferred compensation under share award plan                                                (341)                   (341)
Retained earnings (deficit)                                                              (33,626)                (30,916)
Less treasury shares, at cost
Accumulated other comprehensive income consisting of unrealized
appreciation of investments, net of income tax                                            18,123                  18,432
                                                                                 ------------------      ------------------
TOTAL SHAREHOLDERS' EQUITY                                                               272,299                 275,318
                                                                                 ------------------      ------------------
Total Liabilities & Shareholders' Equity                                                $295,907                $298,926
                                                                                 ==================      ==================
</Table>




                                                             9
<Page>


<Table>
<Caption>
                                          ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                         NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



4.     RESTATEMENT (CONT'D.)

CONSOLIDATED STATEMENT OF INCOME:                                                             MARCH 31, 2001
                                                                                 ------------------------------------------
(IN THOUSANDS, EXCEPT SHARE DATA)                                                       AS                 AS PREVIOUSLY
                                                                                     RESTATED                REPORTED
                                                                                 ------------------      ------------------
                                                                                                            
REVENUES
Net premiums written                                                                      $2,837                  $2,837
(Increase) decrease in unearned premiums                                                  (1,204)                 (1,204)
                                                                                 ------------------      ------------------
Net premiums earned                                                                        1,633                   1,633
Net investment income                                                                      3,160                   3,160
Net investment gains                                                                       9,004                   9,004
Equity in net income (loss) of investees                                                     888                   1,036
Fee income                                                                                 1,715                   1,715
Net commission income                                                                        482                     482
                                                                                 ------------------      ------------------
TOTAL REVENUES                                                                            16,882                  17,030

EXPENSES
Claims and claims expenses                                                                 1,545                   1,545
Commissions and brokerage
Other operating expenses                                                                   4,038                   4,038
Foreign exchange loss
                                                                                 ------------------      ------------------
TOTAL EXPENSES                                                                             5,583                   5,583

INCOME BEFORE INCOME TAXES                                                                11,299                  11,447

Federal income taxes:
Current                                                                                      201                     201
Deferred                                                                                   3,105                   3,105
                                                                                 ------------------      ------------------
Income tax expense                                                                         3,306                   3,306
                                                                                 ------------------      ------------------

NET INCOME                                                                                $7,993                  $8,141
                                                                                 ==================      ==================

AVERAGE SHARES OUTSTANDING
Basic                                                                                 12,786,631              12,786,631
Diluted                                                                               12,792,448              12,792,448

Basic and diluted net income per share                                                     $0.63                   $0.64
</Table>




                                                             10
<Page>

<Table>
<Caption>
                                          ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                                         NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



4.     RESTATEMENT (CONT'D.)

CONSOLIDATED STATEMENT OF INCOME:                                                             MARCH 31, 2000
                                                                                 ------------------------------------------
(IN THOUSANDS, EXCEPT SHARE DATA)                                                       AS                 AS PREVIOUSLY
                                                                                     RESTATED                REPORTED

                                                                                 ------------------      ------------------
                                                                                                        
REVENUES
Net premiums written                                                                     $52,889                 $52,889
(Increase) decrease in unearned premiums                                                   5,273                   5,273
                                                                                 ------------------      ------------------
Net premiums earned                                                                       58,162                  58,162
Net investment income                                                                      5,290                   5,290
Net investment gains                                                                      32,473                  29,300
Equity in net income (loss) of investees                                                    (220)                     46
Fee income
Net commission income
                                                                                 ------------------      ------------------
TOTAL REVENUES                                                                            95,705                  92,798

EXPENSES
Claims and claims expenses                                                                53,875                  53,875
Commissions and brokerage                                                                 16,753                  16,753
Other operating expenses                                                                   2,568                   2,568
Foreign exchange loss                                                                      1,159                   1,159
                                                                                 ------------------      ------------------
TOTAL EXPENSES                                                                            74,355                  74,355

INCOME BEFORE INCOME TAXES                                                                21,350                  18,443

Federal income taxes:
Current                                                                                      264                     264
Deferred                                                                                  13,389                  12,371
                                                                                 ------------------      ------------------
Income tax expense                                                                        13,653                  12,635
                                                                                 ------------------      ------------------

NET INCOME                                                                                $7,697                  $5,808
                                                                                 ==================      ==================

AVERAGE SHARES OUTSTANDING
Basic                                                                                 15,517,163              15,517,163
Diluted                                                                               15,518,341              15,518,341

Basic and diluted net income per share                                                     $0.50                   $0.37
</Table>

5.     ACCOUNTING PRONOUNCEMENTS

       Statement of Financial Accounting Standard ("SFAS") No. 133 establishes
accounting and reporting standards for derivative instruments, including certain
derivative instruments imbedded in other contracts, such as convertible
securities, and hedging activities, and requires that all derivative financial
instruments be recognized in the balance sheet as either assets or liabilities
and measured at fair value. The recognition of the change in the fair value of a
derivative depends on a number of factors, including the intended use of the
derivative. Currently, the Company's portfolio includes market sensitive
instruments, such as mortgage-backed securities, which are subject to prepayment
risk and changes in market value in connection with changes in interest rates.
In adopting SFAS No. 133, the recognition of the change in the fair value of any
embedded derivative is recorded as a component of net income.

       For the Company, this statement was effective for the year beginning
January 1, 2001, and has been adopted herein. SFAS No. 133 did not have a
material impact on the Company's results of operations, financial condition or
liquidity because the Company generally does not engage in derivative
activities.



                                                             11
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



6.     GOODWILL

       Goodwill of acquired businesses represents the difference between
purchase cost and the fair value of the net assets of the acquired businesses
and is being amortized on a straight-line basis over the expected life of the
related operations acquired, which generally does not exceed 15 years. The
Company recorded goodwill related to its investment in Hales and AIHC. The
Company evaluates the recoverability of the carrying value of goodwill related
to acquired businesses on an undiscounted basis to ensure it is properly valued.
If it is determined that an impairment exists, the excess of the unamortized
balance will be charged to earnings at that time.

7.     CONTINGENCIES RELATING TO SALE OF REINSURANCE OPERATIONS

       Under the terms of the agreement relating to the sale of the Company's
reinsurance operations to Folksamerica on May 5, 2000, the Company placed $20
million of the purchase price in escrow for a period of five years. Such amounts
represent restricted funds that appear under a separate caption entitled
"Securities held in escrow" on the Company's consolidated balance sheet at March
31, 2001. These funds will be used to reimburse Folksamerica if the loss
reserves (which were $32.3 million at the closing of the asset sale) transferred
to it in the asset sale relating to business produced on behalf of Arch Re by a
certain managing underwriting agency are deficient as measured at the end of
such five-year period or to satisfy certain indemnity claims Folksamerica may
have during such period. In connection with the escrow arrangement, the Company
will record a loss in an amount equal to any probable deficiency in the related
reserve that may become known during or at the end of the five-year period. If
such loss reserves are redundant, all of the escrowed funds will be released
from escrow to the Company and Folksamerica will pay the Company an amount equal
to such redundancy.

       As required under the agreement, Folksamerica reported to the Company
that adverse development had occurred in the loss reserves subject to the
Folksamerica escrow agreement for the period from May 5, 2000 to December 31,
2000. Based on such information and an independent actuarial analysis, the
Company recorded in the 2000 fourth quarter a loss contingency of $15 million,
on a pre-tax basis, to recognize a probable deficiency in such reserves. The
actuarial analysis was based on estimates of claims and claims expenses incurred
as of December 31, 2000 and, therefore, the amount ultimately paid may be more
or less than such estimate.

       Under the terms of the agreement, the Company has also purchased
reinsurance protection covering the Company's aviation business to reduce the
net financial loss to Folksamerica on any large commercial airline catastrophe
to $5.4 million, net of reinstatement premiums. Although the Company believes
that any such net financial loss will not exceed $5.4 million, the Company has
agreed to reimburse Folksamerica for a net financial loss it may incur that is
in excess of $5.4 million for aviation losses under certain circumstances prior
to May 5, 2003.

       The Company also made representations and warranties to Folksamerica
about the Company and the business transferred to Folksamerica for which the
Company retains exposure for certain periods. Although Folksamerica has not
asserted that any amount is currently due under any of the indemnities provided
by the Company under the asset purchase agreement, Folksamerica has indicated a
potential indemnity claim under the agreement in the event of the occurrence of
certain future events. Based on all available information, the Company denies
the validity of any such potential claim.



                                       12
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



7.     CONTINGENCIES RELATING TO SALE OF REINSURANCE OPERATIONS (CONT'D.)

       At the closing of the asset sale, Arch Re and Folksamerica entered into a
transfer and assumption agreement, under which Folksamerica assumed Arch Re's
rights and obligations under the reinsurance agreements transferred in the asset
sale. The reinsureds under such agreements that were in-force were notified that
Folksamerica had assumed Arch Re's obligations and that, unless the reinsureds
object to the assumption, Arch Re will be released from its obligations to those
reinsureds. None of such reinsureds objected to the assumption and, accordingly,
the gross liabilities for such business have been removed from the accounts of
Arch Re for statutory and GAAP accounting purposes. However, Arch Re will
continue to be liable under those reinsurance agreements if the notice is found
not to be an effective release by the reinsureds. Folksamerica has agreed to
indemnify the Company for any losses arising out of the reinsurance agreements
transferred to Folksamerica Reinsurance Company in the asset sale. However, in
the event that Folksamerica refuses or is unable to perform its obligations to
the Company, Arch Re may incur losses relating to the reinsurance agreements
transferred in the asset sale.

8.     ACQUISITION

       On February 28, 2001, the Company completed a reorganization transaction
pursuant to which the Company acquired all of the common stock of AIHC, one of
its investee companies. See Note 9. AIHC is a specialty property and casualty
insurance holding company that, through its subsidiaries, markets and
underwrites nonstandard personal automobile liability and physical damage lines
of insurance, primarily in Pennsylvania, as well as in Maryland and Delaware.

       The Company purchased a portion of the outstanding shares of AIHC for
$1.25 million. The remaining outstanding shares of AIHC were redeemed by AIHC in
exchange for the right to receive a portion of the proceeds resulting from the
final adjudication or settlement of certain lawsuits that AIHC, as plaintiff,
has previously filed against certain defendants. A third party also forgave the
obligations owing to it under certain notes previously issued by AIHC in the
aggregate principal amount of $4 million and returned certain warrants to
purchase shares of AIHC in exchange for the right to receive a portion of the
proceeds resulting from the final adjudication or settlement of such lawsuits.
Immediately after the Company's purchase of AIHC, the Company contributed to the
capital of AIHC notes in the aggregate principal amount of $8.5 million that
were issued to the Company in connection with loans it had previously made to
AIHC and also returned certain warrants to purchase shares of AIHC. Following
the purchase, the Company also made a capital contribution to AIHC in the amount
of $11 million.

       In connection with the loans the Company had previously made to AIHC, the
Company had obtained rights to provide reinsurance to AIHC's subsidiary,
American Independent Insurance Company ("American Independent"), for specified
periods, which rights had been transferred to Folksamerica in the asset sale on
May 5, 2000. In connection with the Company's acquisition of AIHC, Folksamerica
released American Independent from these reinsurance commitments at a cost to
American Independent of $1.5 million.

9.     EARNINGS PER SHARE DATA

       Earnings per share are computed in accordance with SFAS No. 128
"Earnings Per Share."

       Basic earnings per share exclude dilution and is computed by dividing
income available to common shareholders by the weighted average number of Common
Shares outstanding for the periods. Diluted earnings per share reflect the
potential dilution that could occur if Class A and B warrants and employee stock
options were exercised or converted into Common Shares. When a loss occurs,
diluted per share amounts are computed using basic average shares outstanding
because including dilutive securities would decrease the loss per share and
would therefore be anti-dilutive.



                                       13
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



9.       EARNINGS PER SHARE DATA (CONT'D.)

The following table sets forth the computation of basic and diluted earnings per
share:

<Table>
<Caption>
                                                                         (IN THOUSANDS, EXCEPT SHARE DATA)
                                                                                 THREE MONTHS ENDED
                                                                                      MARCH 31,
                                                                            2001                    2000
                                                                    ---------------------    --------------------
                                                                         (Restated)               (Restated)
                                                                                              
        NET INCOME
        BASIC EARNINGS PER SHARE:
        Net income                                                               $7,993                 $7,697
        Divided by:
        Weighted average shares outstanding for the period                   12,786,631             15,517,163
        Basic earnings per share                                                  $0.63                  $0.50

        DILUTED EARNINGS PER SHARE:
        Net income                                                               $7,993                 $7,697
        Divided by:
        Weighted average shares outstanding for the period                   12,786,631             15,517,163
        Effect of dilutive securities:
             Warrants
             Employee stock options                                               5,817                  1,178
                                                                     --------------------     -------------------
        Total shares                                                         12,792,448             15,518,341
                                                                     ====================     ===================
        Diluted earnings per share                                                $0.63                  $0.50
</Table>


10.    INVESTMENT INFORMATION

       Realized investment gains (losses) for the three month period ended March
31, 2001 consisted of the following:

<Table>
<Caption>
                                                                      (IN THOUSANDS)
                                                                     THREE MONTHS ENDED
                                                                      MARCH 31, 2001
                                                       ----------------------------------------------
                                                                                             NET
                                                          GROSS             GROSS         REALIZED
                                                         REALIZED         REALIZED          GAINS
                                                          GAINS            LOSSES         (LOSSES)
                                                       -------------     ------------    ------------
                                                                                           
         Fixed maturities                                       $53                              $53
         Publicly traded equity securities                    8,951                            8,951
         Privately held securities
                                                       -------------     ------------    ------------
         Total                                               $9,004                           $9,004
                                                       =============     ============    ============
</Table>



                                                        14
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



10.    INVESTMENT INFORMATION (CONT'D.)

       The following table reconciles estimated fair value and carrying value to
the amortized cost of fixed maturities and equity securities:

<Table>
<Caption>
                                                                           (IN THOUSANDS)
                                                                           MARCH 31, 2001
                                          -------------------------------------------------------------------------------
                                            ESTIMATED
                                            FAIR VALUE
                                                AND                GROSS                GROSS
                                             CARRYING           UNREALIZED           UNREALIZED             AMORTIZED
                                               VALUE               GAINS               (LOSSES)               COST
                                          ---------------     ---------------      -----------------     ----------------
                                            (Restated)         (Restated)             (Restated)           (Restated)
                                                                                                    
  Fixed maturities                               $90,400             $1,666                ($1,944)             $90,678
  Publicly traded equity securities               28,224             12,213                   (848)              16,859
  Privately held securities                       49,027                                      (247)              49,274
  Securities held in escrow                       21,373                268                                      21,105
                                          ---------------     ---------------      -----------------     ----------------
  Total                                         $189,024            $14,147                ($3,039)            $177,916
                                          ===============     ===============      =================     ================
</Table>

       The Company classifies all of its publicly traded fixed maturities and
equity securities as "available for sale" and, accordingly, they are carried at
estimated fair value. The fair value of publicly traded fixed maturities and
publicly traded equity securities is estimated using quoted market prices or
dealer quotes. Short-term investments, which have a maturity of one year or less
at the date of acquisition, are carried at cost, which approximates fair value.

       At March 31, 2001, the Company's publicly traded equity securities and
privately held securities were issued by insurance and reinsurance companies or
companies providing services to the insurance industry. At such date, the
publicly traded equity portfolio consisted of the following:

<Table>
<Caption>
                                                                          (IN THOUSANDS)
                                                                          MARCH 31, 2001
                                          -------------------------------------------------------------------------------
                                            ESTIMATED
                                            FAIR VALUE
                                                AND                GROSS                GROSS
                                             CARRYING           UNREALIZED           UNREALIZED             AMORTIZED
                                               VALUE               GAINS               (LOSSES)               COST
                                          ---------------     ---------------      -----------------     ----------------
                                                                                                    
  COMMON STOCK:
  ACE Limited                                     $9,224             $2,908                                      $6,316
  XL Capital Ltd                                   7,987              4,403                                       3,584
  Farm Family Holdings, Inc.                       1,342                430                                         912
  Meadowbrook Insurance Group                        610                                     ($848)               1,458
  Renaissance Re                                   2,450              1,253                                       1,197
  Metropolitan Life Insurance Company              6,611              3,219                                       3,392
                                           --------------     ---------------         --------------     ----------------
           Total                                 $28,224            $12,213                  ($848)             $16,859
                                           ==============     ===============         ==============     ================
</Table>





                                                        15
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



10.    INVESTMENT INFORMATION (CONT'D.)

       Investments in privately held securities may include both equity
securities and securities convertible into, or exercisable for, equity
securities (some of which may have fixed maturities). Privately held securities
are subject to trading restrictions or are otherwise illiquid and do not have
readily ascertainable market values. The risk of investing in such securities is
generally greater than the risk of investing in securities of widely held,
publicly traded companies. Lack of a secondary market and resale restrictions
may result in the Company's inability to sell a security at a price that would
otherwise be obtainable if such restrictions did not exist and may substantially
delay the sale of a security which the Company seeks to sell. Such investments
are classified as "available for sale" and carried at estimated fair value,
except for investments in which the Company believes it has the ability to
exercise significant influence (generally defined as investments in which the
Company owns 20% or more of the outstanding voting common stock of the issuer),
which are carried under the equity method of accounting. Under this method, the
Company records its proportionate share of income or loss for such investments
in results of operations.

       Goodwill for privately held equity securities carried under the equity
method of accounting was $7.9 million at March 31, 2001, compared to $8.0
million at December 31, 2000.

       The estimated fair value of investments in privately held securities,
other than those carried under the equity method or those with quoted market
values, is initially equal to the cost of such investments until the investments
are revalued based principally on substantive events or other factors which
could indicate a diminution or appreciation in value, such as an arm's-length
third party transaction justifying an increased valuation or adverse development
of a significant nature requiring a write-down. The Company periodically reviews
the valuation of investments in privately held securities with MMC Capital, Inc.
("MMC Capital"), its equity investment advisor with respect to certain of the
Company's privately held securities.

       Privately held securities consisted of the following:

<Table>
<Caption>
                                                                                            (IN THOUSANDS)
                                                                                   MARCH 31,             DECEMBER 31,
                                                                                     2001                    2000
                                                                              --------------------    -------------------
                                                                                  (Restated)              (Restated)
                                                                                                      
        CARRIED UNDER THE EQUITY METHOD:
        Arch Risk Transfer Services Ltd.                                            $12,947                 $12,981
        The ARC Group, LLC                                                            8,039                   8,468
        Arx Holding Corp.                                                             3,458                   3,514
        Island Heritage Insurance Company, Ltd.                                       4,575                   4,534
        New Europe Insurance Ventures                                                   705                     642
        Sunshine State Holding Corporation                                            2,140                   1,766
                                                                              --------------------    -------------------
             Sub-total                                                               31,864                  31,905
                                                                              --------------------    -------------------

        CARRIED AT FAIR VALUE:
        American Independent Insurance Holding Company                                                        7,350
        Distribution Investors, LLC                                                     100                     100
        GuideStar Health Systems, Inc.                                                  250                     250
        Stockton Holdings Limited                                                    10,000                  10,000
        Trident II, L.P.                                                              6,813                   6,813
                                                                              --------------------    -------------------
             Sub-total                                                               17,163                  24,513
                                                                              --------------------    -------------------
             Total                                                                  $49,027                 $56,418
                                                                              ====================    ===================
</Table>



                                                        16
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



10.    INVESTMENT INFORMATION (CONT'D.)

       During the three-month period ended March 31, 2001, the Company received
distributions from The ARC Group, LLC totaling $945,000.

       At March 31, 2001, the Company had investment commitments relating to its
privately held securities totaling approximately $22 million. The outstanding
commitments at March 31, 2001 included $17.6 million committed to Trident II,
L.P., an investment fund established by MMC Capital dedicated to making private
equity and equity related investments in the global insurance, reinsurance and
related industries, and $1.2 million to Distribution Investors, LLC, the general
partner of Distribution Partners Investment Capital, L.P., a private equity fund
investing in insurance distribution entities which is affiliated with Hales.

       Set forth below is certain information relating to the Company's private
investment activity for the three month period ended March 31, 2001:

       AMERICAN INDEPENDENT INSURANCE HOLDING COMPANY

       On February 28, 2001, the Company completed a reorganization transaction
pursuant to which the Company acquired all of the common stock of one of its
investee companies, AIHC. See Note 7. Immediately after the Company's purchase
of AIHC, the Company contributed to the capital of AIHC notes in the aggregate
principal amount of $8.5 million that were issued to the Company in connection
with loans it had previously made to AIHC. At that date, the Company restored
the estimated market value discount on the loans in the amount of $1.1 million,
which had been previously recorded in the Company's financial statements. The
Company also returned certain warrants to purchase shares of AIHC.

       ARCH RISK TRANSFER SERVICES LTD.

       On March 23, 2001, the Company entered into a reorganization agreement
for the acquisition of all of the remaining ownership interests in one of its
current investee companies, Arch Risk Transfer Services Ltd. ("ART Services"),
formerly known as Altus Holdings, Ltd., which provides insurance and alternative
risk transfer services through rent-a-captive and other facilities. ART Services
includes First American Insurance Company, an admitted insurer with licenses in
49 states and an A.M. Best rating of A-.

       The acquisition was completed on June 22, 2001. See Note 4 for further
details on this acquisition.

11.    INCOME TAXES

       ACGL is incorporated under the laws of Bermuda and, under current Bermuda
law, is not obligated to pay any taxes in Bermuda based upon income or capital
gains. The Company has received a written undertaking from the Minister of
Finance in Bermuda under the Exempted Undertakings Tax Protection Act 1966 that,
in the event that any legislation is enacted in Bermuda imposing any tax
computed on profits, income, gain or appreciation on any capital asset, or any
tax in the nature of estate duty or inheritance tax, such tax will not be
applicable to ACGL or any of its operations until March 28, 2016. This
undertaking does not, however, prevent the imposition of taxes on any person
ordinarily resident in Bermuda or any company in respect of its ownership of
real property or leasehold interests in Bermuda.

       ACGL will be subject to U.S. federal income tax only to the extent that
it derives U.S. source income that is subject to U.S. withholding tax or income
that is effectively connected with the conduct of a trade or business within the
U.S. and is not exempt from U.S. tax under an applicable income tax treaty with
the United States. ACGL will be subject to a withholding tax on dividends from
U.S. investments and interest from certain U.S. payors. ACGL's U.S. subsidiaries
will continue to be subject to U.S. income taxes on their worldwide income.




                                       17
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



11.    INCOME TAXES (CONT'D.)

       Arch-U.S., Hales, Arch Re and Cross River file a U.S. consolidated
federal income tax return, with Arch-U.S. serving as the common parent, and have
a tax sharing agreement (the "Tax Sharing Agreement"), allocating the
consolidated income tax liability on a separate return basis. Pursuant to the
Tax Sharing Agreement, Hales, Arch Re and Cross River make tax sharing payments
to Arch-U.S. based on such allocation. In addition, AIHC, a U.S. subsidiary of
ACGL, files a separate U.S. consolidated return with its subsidiaries, American
Independent, American Independent Services Company and C&L Insurance Agency,
Inc. An analysis of the Company's effective tax rate for the three months ended
March 31, 2001 and 2000 follows:

<Table>
<Caption>
                                                                                            (IN THOUSANDS)
                                                                                          THREE MONTHS ENDED
                                                                                              MARCH 31,
                                                                                      2001                  2000
                                                                              -------------------   -------------------
                                                                                  (Restated)            (Restated)
                                                                                                        
        Income tax computed on pre-tax income                                           $3,955                $7,473
        Addition (reduction) in income tax resulting from:
             Valuation allowance                                                          (174)                6,285
             Write-off of deferred tax asset                                               251
             Tax-exempt investment income                                                                       (162)
             Dividend received deduction                                                   (15)                 (127)
             Foreign income, not subject to income tax                                    (787)
             Other                                                                          76                   184
                                                                              -------------------   -------------------
        Income tax expense on pre-tax income                                            $3,306               $13,653
                                                                              ===================   ===================
</Table>

       Deferred income taxes reflect the tax effect of temporary differences
between the value of assets and liabilities for financial reporting purposes and
such values as measured by U.S. tax laws and regulations. The net deferred
income tax asset is net of a valuation allowance for the portion of the deferred
tax asset that management believes may not be realized. Significant components
of the Company's deferred income tax assets and liabilities as of March 31, 2001
and December 31, 2000 were as follows:

<Table>
<Caption>
                                                                                        (IN THOUSANDS)
                                                                                MARCH 31,             DECEMBER 31,
                                                                                  2001                   2000
                                                                           --------------------    -------------------
                                                                                                      
        Deferred income tax assets:
             Net operating loss                                                      $12,900                $12,465
             AMT credit carryforward                                                     651                    651
             Net claim reserve discount                                                  856
             Net unearned premium reserve                                                868
             Unrealized loss on private equity                                           262                    262
             Unrealized loss on marketable securities                                    548                    606
             Compensation liabilities                                                     53                    250
               Net unrealized depreciation of investments                                262
             Other, net                                                                  805                     48
                                                                           --------------------    -------------------
        Total deferred tax assets                                                     17,205                 14,282
                                                                           --------------------    -------------------
        Deferred income tax liabilities:
             Equity in net income on investees, net                                     (549)                  (379)
             Deferred policy acquisition cost                                           (869)
             Net unrealized appreciation of investments                                                         (61)
                                                                           --------------------    -------------------
        Total deferred tax liabilities                                                (1,418)                  (440)
                                                                           --------------------    -------------------
        Valuation allowance                                                           (7,807)                (5,650)
                                                                           --------------------    -------------------
        Net deferred income tax asset                                                 $7,980                 $8,192
                                                                           ====================    ===================
</Table>




                                       18
<Page>


                    ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



11.    INCOME TAXES (CONT'D.)

       As of March 31, 2001, the Company has a deferred income tax valuation
allowance of $7.8 million that adjusts the net deferred income tax asset to its
estimated realizable value of approximately $8.0 million.

       The Company's U.S. subsidiaries have total net operating loss
carryforwards of $36.9 million, substantially all of which expire between 2019
and 2020.

12.    SEGMENT INFORMATION

       The Company is a Bermuda-based, diversified financial services holding
company, with an emphasis on the insurance sector. The Company owns and intends
to acquire operating businesses that will enable it to generate both fee-based
revenue (E.G., commissions and advisory and management fees) and risk-based
revenue (I.E., insurance premium).

       SFAS No. 131 requires certain disclosures about operating segments in a
manner that is consistent with how management evaluates the performance of the
segment. As described below, the Company's two operating segments include
insurance and merchant banking:

<Table>
<Caption>
BUSINESS IDENTITY                                                  BUSINESS ACTIVITY
- ---------------------------------------------------------------    ---------------------------------------------------------
                                                                
American Independent Insurance Holding Company                     Markets and underwrites nonstandard personal automobile
                                                                   liability and physical damage lines of insurance,
                                                                   primarily in Pennsylvania.

Hales & Company Inc.                                               A merchant  banking firm  specializing  in the insurance
                                                                   industry.
</Table>

         The Company's insurance operating segment includes total assets of
$160.8 million at March 31, 2001, and revenues of $3 million and net income of
$117,000 for the quarter ended March 31, 2001.

         The results of the Company's merchant banking operating segment did not
meet any of the thresholds for segment reporting. Its contribution to the
Company's net income was not material for the 2001 first quarter.



                                       19
<Page>


         MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
                             RESULTS OF OPERATIONS

                                     GENERAL

       THE COMPANY

       Arch Capital Group Ltd. ("ACGL") is a Bermuda-based, diversified
financial services holding company, with an emphasis on the insurance sector. We
own and intend to acquire operating businesses that will enable us to generate
both fee-based revenue (E.G., commissions and advisory and management fees) and
risk-based revenue (I.E., insurance premium). We will participate in the
insurance sector through our ownership interest in various insurance-related
entities such as intermediaries, underwriting agencies, service providers and
insurance companies, each of which will capture a portion of insurance premium
at different points in the insurance chain. As part of our strategy of
diversification and of growing our sources of fee-based revenues, we may also
acquire ownership interests in financial services entities outside the insurance
sector.

       In connection with the development of the risk bearing portion of our
business, we intend to capitalize a Bermuda-based reinsurance company, which
will underwrite business produced by intermediaries, underwriting agencies and
insurance companies owned by or affiliated with us, as well as business produced
by third parties. The Bermuda location provides us with a favorable business
environment for engaging in some of our risk-based activities. We believe that
our ownership interests in a Bermuda-based reinsurance company and other
risk-bearing entities, as well as in insurance intermediaries, underwriting
agencies and other fee-based businesses, will enable us to maximize risk-based
revenues during periods in the underwriting cycle when it is favorable to assume
more underwriting risk, and to increase our focus on fee-based revenues and
assume less underwriting risk when the underwriting cycle presents less
favorable conditions.

       In November 2000, ACGL became the sole shareholder of Arch Capital Group
(U.S.) Inc. ("Arch-U.S.") pursuant to an internal reorganization transaction.
Arch-U.S. is a Delaware company formed in March 1995 under the original name of
"Risk Capital Holdings." Arch-U.S. commenced operations in September 1995
following the completion of its initial public offering. Prior to May 5, 2000,
Arch-U.S. provided reinsurance and other forms of capital for insurance
companies through its wholly owned subsidiary, Arch Reinsurance Company ("Arch
Re"), a Nebraska corporation formed in 1995 under the original name of "Risk
Capital Reinsurance Company." On May 5, 2000, Arch-U.S. sold the reinsurance
operations of Arch Re to Folksamerica Reinsurance Company in an asset sale.

       On February 28, 2001, we completed a reorganization transaction pursuant
to which we acquired all of the common stock of American Independent Insurance
Holding Company ("AIHC"), one of our investee companies. AIHC, through its
wholly owned subsidiary, American Independent Insurance Company, markets and
underwrites nonstandard personal automobile liability and physical damage lines
of insurance, primarily in Pennsylvania, as well as in Maryland and Delaware. On
an ongoing basis we will determine the amount of the insurance premium produced
by American Independent that will be retained by us and the amount of commission
income we will capture through the purchase of reinsurance. For the year 2001,
we will reinsure with third parties approximately 70% of American Independent's
business and retain the remaining underwriting risk. See note 8 under the
caption "Acquisition" of the notes accompanying our consolidated financial
statements.

       ACQUISITION

       On March 23, 2001, we entered into a reorganization agreement for the
acquisition of all of the remaining ownership interests in Arch Risk Transfer
Services, Ltd. ("ART Services"), formerly known as Altus Holdings, Ltd., which
provides insurance and alternative risk transfer services through rent-a-captive
and other facilities. ART Services includes First American Insurance Company, an
admitted insurer in 49 states with an A.M. Best rating of "A-." The acquisition
was completed on June 22, 2001. See note 4 of the notes accompanying our
consolidated financial statements for further details on this acquisition.



                                       20
<Page>


       RESTATEMENT

       Upon the closing of our acquisition of the remaining ownership interests
in ART Services, we were required under generally accepted accounting principles
governing a "step acquisition" of an investee company to retroactively adopt the
equity method of accounting for our original 27.9% ownership interest in ART
Services for the periods prior to the acquisition and to restate our historical
financial results. As a result of this change, we have restated our first
quarter 2001 and 2000 financial statements and related disclosures. The required
change to the equity method of accounting for this investment resulted in a
reduction in our book value at March 31, 2001 in the amount of $3.1 million, or
$0.24 per share. See note 4 under the caption "Restatement" of the notes
accompanying our consolidated financial statements.

       COMPANY INFORMATION

       At March 31, 2001, our consolidated shareholders' equity was $269.4
million. Our common shares are traded on the Nasdaq National Market under the
symbol "ACGL." Our principal offices are located at Clarendon House, 2 Church
Street, Hamilton HM 11 Bermuda (phone number: (441) 295-1422), and our executive
offices are located at 20 Horseneck Lane, Greenwich, Connecticut 06830 (phone
number: (203) 862-4300).

                         LIQUIDITY AND CAPITAL RESOURCES

       We are a holding company whose assets primarily consist of the stock of
our subsidiaries and invested assets totaling $191.2 million at March 31, 2001.
We continuously investigate possible acquisitions of new businesses in support
of our strategy and evaluate the retention or disposition of our existing
subsidiaries and investments. Accordingly, while we do not currently have any
material arrangements or commitments with respect thereto (except as disclosed
in this report), we intend to make further acquisitions, and it is possible that
divestitures and changes in capital structure could occur. We depend on our
available cash resources, liquid investments and dividends or other
distributions from our subsidiaries to make payments, including the payment of
operating expenses we may incur and for any dividends our board of directors may
determine. Our board does not currently intend to declare any dividends or make
any other distributions.

       As of March 31, 2001, we had $45.2 million of cash and short-term
investments, $62.6 million of fixed maturity investments, and $27.6 million of
publicly traded equity securities. As of that date, investments that are
restricted or generally unavailable for liquidity purposes included $34.4
million of privately held securities and $21.4 million of fixed maturity
investments held in escrow in connection with the sale of our reinsurance
operations. In addition, we have an investment commitment relating to our
privately held investment in Trident II totaling approximately $17.6 million.
Amounts discussed above do not include the stock of our subsidiaries or their
invested assets. See note 10 under the caption "Investments" of the notes
accompanying our consolidated financial statements.

       Our future net cash flow will depend on the receipt of dividends and
other distributions from our subsidiaries and proceeds on the disposition of
such subsidiaries, as well as investment income and proceeds on the sale or
maturity of our investments. The ability of our insurance subsidiaries, American
Independent and Arch Re, to pay dividends or make distributions is dependent on
their ability to meet applicable regulatory standards. Based on 2000 results,
American Independent may not pay any dividends or make other distributions
during 2001 without prior regulatory approval. Due to the distributions made by
Arch Re in connection with the XL Capital share repurchase and our
redomestication to Bermuda in 2000, Arch Re may not make any distributions
without prior regulatory approval until December 2001.

        We expect that our operational needs for the foreseeable future will be
met by our balance of cash and short-term investments, as well as by funds
generated from investment income and proceeds on the sale or maturity of our
investments. We will continue to pursue and investigate possible business
combinations and ventures with new operating businesses in furtherance of our
strategy. In that connection, we may need to secure additional financing to
carry out our business plan. We cannot assure you that we will be successful in
obtaining any such financing or in the implementation of our business plan.



                                       21
<Page>


       Consolidated cash flows from operating activities for the three months
ended March 31, 2001 and 2000 was approximately $0.3 million and ($2.7) million,
respectively.

       We are subject to certain contingencies relating to the sale of our
reinsurance operations on May 5, 2000, as described in note 7 under the caption
"Contingencies Relating to the Sale of Reinsurance Operations" of the notes
accompanying our consolidated financial statements.

                                   INVESTMENTS

       We seek to acquire operating companies in support of our business plan of
building a diversified financial services holding company. Our success depends
to a large extent on the operations, financial condition and management of the
companies with which we may merge or which we may acquire in whole or in part.

       At March 31, 2001, consolidated cash and invested assets totaled
approximately $281.7 million, consisting of $92.7 million of cash and short-term
investments, $90.4 million of publicly traded fixed maturity investments, $21.4
million of fixed maturities held in escrow, $28.2 million of publicly traded
equity securities, and $49.0 million of privately held securities.

       Our publicly traded equity portfolio consists of securities issued by
insurance and reinsurance companies and companies providing services to the
insurance industry. Such portfolio lacks industry diversification and will be
particularly subject to the performance of the insurance industry. Unlike fixed
income securities, equity securities such as common stocks, including the equity
securities in which we have invested, generally are not and will not be rated by
any nationally recognized rating service. The values of equity securities
generally are more dependent on the financial condition of the issuer and less
dependent on fluctuations in interest rates than are the values of fixed income
securities. The market value of equity securities generally is regarded as more
volatile than the market value of fixed income securities. Since the realization
of gains and losses on equity investments is not generally predictable, such
gains and losses have differed and will differ significantly from period to
period. Variability and declines in our results of operations could be further
exacerbated by certain private equity investments which are accounted for under
the equity method. The effects of such volatility on our equity portfolio could
be worsened to the extent that such portfolio is concentrated in the insurance
industry and in relatively few issuers.

       Investments included in our private portfolio include securities issued
by privately held companies that are generally restricted as to resale or are
otherwise illiquid and do not have readily ascertainable market values. The risk
of investing in such securities is generally greater than the risk of investing
in securities of widely held, publicly traded companies. Lack of a secondary
market and resale restrictions may result in an inability by us to sell a
security at a price that would otherwise be obtainable if such restrictions did
not exist and may substantially delay the sale of a security we seek to sell.

       At March 31, 2001, our private equity portfolio consisted of ten
investments, with additional investment portfolio commitments in an aggregate
amount of approximately $22.0 million.

       See note 10 under the caption "Investment Information" of the notes
accompanying our consolidated financial statements for certain information
regarding our publicly traded and privately held securities and their carrying
values, and commitments made by us relating to our privately held securities.

       On February 28, 2001, we completed a reorganization transaction pursuant
to which we acquired all of the common stock of AIHC, one of our investee
companies. On March 23, 2001, we entered into a reorganization agreement for the
acquisition of the remaining ownership interests in Altus Holdings, Ltd.,
another of our investee companies. See "--Acquisition" above and note 8 and note
10 of the notes accompanying our consolidated financial statements.

       At March 31, 2001, approximately 86.9% of our fixed maturity and
short-term investments were rated investment grade by Moody's or Standard &
Poor's and had an average quality rating of A+ and an average duration of
approximately 1.5 years. In November 2000, we liquidated our high yield
portfolio in connection with our reorganization transaction. In January 2001, we
began to reinvest approximately $35 million of cash in



                                       22
<Page>


high yield fixed maturity investments. At March 31, 2001, we had approximately
$33.6 million of such funds invested in high yield investments, with an average
quality rating of BB- and an average duration of 4.6 years.

      During the 2001 first quarter, we liquidated a substantial portion of the
public equity portfolio. The proceeds from the sales, which amounted to $18
million, were reinvested in short-term money market securities.

      We have not invested in derivative financial instruments such as futures,
forward contracts, swaps, or options or other financial instruments with similar
characteristics such as interest rate caps or floors and fixed-rate loan
commitments. Our portfolio includes market sensitive instruments, such as
mortgage-backed securities, which are subject to prepayment risk and changes in
market value in connection with changes in interest rates.

       MARKET SENSITIVE INSTRUMENTS AND RISK MANAGEMENT

       In accordance with the SEC's Financial Reporting Release No. 48, we
performed a sensitivity analysis to determine the effects that market risk
exposures could have on the future earnings, fair values or cash flows of our
financial instruments as of December 31, 2000. (See "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included in our 2000
Annual Report on Form 10-K.) Market risk represents the risk of changes in the
fair value of a financial instrument and is comprised of several components,
including liquidity, basis and price risks. At March 31, 2001, there have been
no material changes in market risk exposures that affect the quantitative and
qualitative disclosures presented as of December 31, 2000.

RESULTS OF OPERATIONS

        NET INCOME

       For the 2001 first quarter, we reported net income of $8.0 million, or
$0.63 per share, compared with net income of $7.7 million, or $0.50 per share,
for the 2000 first quarter. The 2001 first quarter net income included after-tax
net realized investment gains of $6.2 million, or $0.48 per share, and after-tax
equity in net income of investees of $540,000, or $0.04 per share. These amounts
compare with after-tax net realized investment gains of $21.1 million, or $1.36
per share, and after-tax equity in net loss of investees of $143,000, for the
2000 first quarter.

       SEGMENT DATA

       Statement of Financial Accounting Standard No. 131 requires certain
disclosures about operating segments in a manner that is consistent with how
management evaluates the performance of the segment. Our two operating segments
include insurance and merchant banking. See note 12 under the caption "Segment
Information" of the notes accompanying our consolidated financial statements.

       On February 28, 2001, we completed our acquisition of AIHC, a specialty
property and casualty insurance holding company that, through its subsidiaries,
markets and underwrites nonstandard personal automobile liability and physical
damage lines of insurance, primarily in Pennsylvania, as well as in Maryland and
Delaware. AIHC's net income for the one-month period was not material to our
first quarter results. See note 8 and note 10 of the notes accompanying our
consolidated financial statements.

       Revenues from our merchant bank, Hales, could vary significantly from
quarter to quarter. Such revenues are dependent upon (i) deal flow, which is
influenced by various factors, including the insurance marketplace and economic
conditions, and (ii) risks associated with closing transactions, which include
regulatory and other approvals and other factors outside the control of Hales.
Hale's results of operations for the three months ended March 31, 2001 were not
material to our first quarter results.

       BOOK VALUE PER SHARE

       At March 31, 2001, consolidated shareholders' equity totaled $269.4
million, or $21.00 per share, compared with $272.3 million, or $21.43 per share,
at December 31, 2000. The decrease in book value resulted from a decline in
unrealized appreciation of our investment portfolio totaling $11.5 million, or
$0.90 per share, partially offset by net income. On a diluted basis, which
included dilutive options outstanding, book value per share was $20.81 at March
31, 2001, compared with $21.42 at December 31, 2000.



                                       23
<Page>

       NET INVESTMENT INCOME

       After-tax net investment income for the 2001 first quarter was $2.9
million, compared with $3.7 million for the 2000 first quarter. The decrease in
net investment income in 2001 compared with 2000 primarily reflected the decline
in our average invested asset base resulting from the sale of Arch Re's
reinsurance operations in May 2000, partially offset by a decrease in investment
expenses and higher overall investment yields. Our yields have moderately
increased as proceeds from the sales of public equity securities have been
allocated into short-term investments over the last several quarterly periods.

         For the three month periods ended March 31, 2001 and 2000, our sources
of net realized investment gain (losses) were as follows (in thousands):

<Table>
<Caption>
                                                                               THREE MONTHS ENDED
                                                                                     MARCH 31,
                                                                   ---------------------------------------------
                                                                           2001                     2000
                                                                   --------------------    ---------------------
                                                                                                 (Restated)
                                                                                                
        Fixed maturities                                                         $53                  ($2,399)
        Publicly traded equity securities                                      8,951                   35,359
        Privately held securities                                                                        (487)
                                                                   --------------------    ---------------------
        Total                                                                 $9,004                  $32,473
                                                                   ====================    =====================
</Table>


       During the three months ended March 31, 2001, we disposed of, or reduced
our position in, several publicly traded equity security investments, producing
a net realized gain of $9.0 million.

       For the first three months of 2001, the change in after-tax net
unrealized appreciation of investments of $11.5 million reflects the following
(in millions):

<Table>
<Caption>
                                                              MARCH 31,             DECEMBER 31,
                                                                 2001                   2000                  CHANGE
                                                           -----------------     -------------------     ----------------
                                                              (Restated)              (Restated)            (Restated)
                                                                                                        
Pre-tax unrealized appreciation (depreciation)                      $11.2                   $25.5                ($14.3)
Deferred income tax (benefit) expense                                (4.5)                   (7.4)                  2.9
                                                           -----------------     -------------------     ----------------
After-tax unrealized appreciation (depreciation)                     $6.7                   $18.1                ($11.4)
                                                           =================     ===================     ================
</Table>

       The decline in unrealized appreciation in the 2001 first quarter resulted
from the sales described above, coupled with a decline in market prices in the
insurance sector of the public equity markets and our high yield fixed maturity
investments.

       INCOME TAXES

       Under current Bermuda law, ACGL is not obligated to pay any taxes in
Bermuda based upon income or capital gains. We have received a written
undertaking from the Minister of Finance in Bermuda under the Exempted
Undertakings Tax Protection Act 1966 that, in the event that any legislation is
enacted in Bermuda imposing any tax computed on profits, income, gain or
appreciation on any capital asset, or any tax in the nature of estate duty or
inheritance tax, such tax will not be applicable to us or our operations until
March 28, 2016. This undertaking does not, however, prevent the imposition of
taxes on any person ordinarily resident in Bermuda or any company in respect of
its ownership of real property or leasehold interests in Bermuda.

       ACGL will be subject to U.S. federal income tax only to the extent that
it derives U.S. source income that is subject to U.S. withholding tax or income
that is effectively connected with the conduct of a trade or business within the
United States and is not exempt from U.S. tax under an applicable income tax
treaty with the United States. ACGL will be subject to a withholding tax on
dividends from U.S. investments and interest from certain U.S. payors. ACGL does
not consider itself to be engaged in a trade or business within the United
States and, consequently, does not expect to be subject to direct U.S. income
taxation. ACGL's U.S. subsidiaries will continue to be subject to U.S. income
taxes on their worldwide income.



                                       24
<Page>

       Upon our redomestication to Bermuda, Arch-U.S. distributed substantially
all of its public equity portfolio to its Bermuda parent, ACGL, at the current
market values and realized gains for tax purposes of $21,044,000. The associated
income tax expense of $7,365,000 reduced Arch-U.S.'s net operating loss
carryforwards by such amount. However, for financial reporting purposes, since
the securities have not been sold to an unrelated third party, the realized gain
has been deferred and was reported as unrealized appreciation in our
consolidated financial statements. Accordingly, the income tax expense was also
deferred and reduces unrealized appreciation in our consolidated financial
statements.

       Income tax expense for the three months ended March 31, 2001 was $3.3
million, which included recognizing a portion of the deferred taxes described
above relating to the investment gains realized during the period. This compares
to income tax expense for the three months ended March 31, 2000 of $13.7
million, of which $6.3 million related to the establishment of a valuation
allowance totaling $12.1 million against the deferred tax asset during that
period. The remaining $5.8 million of the valuation allowance was included in
the change in unrealized depreciation of investments.

       As of March 31, 2001, we have a deferred income tax asset valuation
allowance of $7.8 million that adjusts our deferred income tax asset to its
estimated realizable value of approximately $8.0 million. See note 11 under the
caption "Income Taxes" of the notes accompanying our consolidated financial
statements.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

       The Private Securities Litigation Reform Act of 1995 provides a "safe
harbor" for forward-looking statements. This report or any other written or oral
statements made by or on behalf of the Company may include forward-looking
statements which reflect our current views with respect to future events and
financial performance. All statements other than statements of historical fact
included in this report are forward-looking statements. Forward-looking
statements can generally be identified by the use of forward-looking terminology
such as "may," "will," "expect," "intend," "estimate," "anticipate," "believe"
or "continue" or their negative or variations or similar terminology.

       Forward-looking statements involve our current assessment of risks and
uncertainties. Actual events and results may differ materially from those
expressed or implied in these statements. Important factors that could cause
actual events or results to differ materially from those indicated in such
statements are discussed below and elsewhere in this report and include:

      o     the availability of acquisition candidates and other investments on
            attractive terms;

      o     competition for acquisition opportunities and in the businesses of
            the operating companies we have acquired or may acquire of form;

      o     changes in the performance of the insurance sector of the public
            equity markets or market professionals' views as to such sector;

      o     general economic conditions;

      o     regulatory changes and conditions;

      o     losses relating to aviation business and business produced by a
            certain managing underwriting agency for which we may be liable to
            the purchaser of our reinsurance business or to others;

      o     our future business operations and strategy;

      o     the integration of businesses we have acquired or may acquire into
            our existing operations;

      o     rating agency policies and practices;



                                       25
<Page>

      o     greater than expected loss ratios on insurance written by our
            insurance subsidiaries and adverse development of claim and/or claim
            expense liabilities related to business written by our insurance
            subsidiaries in prior years; and

      o     loss of key personnel.

    In addition to risks and uncertainties related to our business, our
proposed acquisition of Altus Holdings, Ltd. is subject to various risks and
uncertainties including, but not limited to, the risks that the conditions to
closing will not be satisfied as well as risks relating to the successful
integration of Altus' business.

    All subsequent written and oral forward-looking statements attributable
to us or persons acting on our behalf are expressly qualified in their entirety
by these cautionary statements. The foregoing review of important factors should
not be construed as exhaustive and should be read in conjunction with other
cautionary statements that are included herein or elsewhere. We undertake no
obligation to publicly update or revise any forward-looking statement, whether
as a result of new information, future events or otherwise.

           QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    Reference is made to the information appearing above under the subheading
"Market Sensitive Instruments and Risk Management" under the caption
"Management's Discussion and Analysis of Financial Condition and Results of
Operations," which information is hereby incorporated by reference.



                                       26
<Page>




PART II.  OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

     The Company's insurance subsidiaries are involved in ordinary routine
litigation and arbitration proceedings incidental to their insurance business.
The Company does not believe that there are any material pending legal
proceedings to which the Company or any of its subsidiaries is a party or of
which any of their property is subject.

ITEM 6.    EXHIBITS AND REPORTS ON FORM 8-K

(a)        EXHIBITS.

<Table>
<Caption>
           EXHIBIT NO.                     DESCRIPTION
           -----------     ----------------------------------------------------
                        
           10              Administrative Services Agreement, between Arch
                           Capital Group Ltd. and Arch Capital Group (U.S.)
                           Inc. (filed as an exhibit to the Company's
                           Form 10-Q for the quarter ended March 31, 2001, as
                           filed with the Securities and Exchange Commission
                           on May 15, 2001, and incorporated by reference)

           15              Accountants' Awareness Letter (regarding unaudited
                           interim financial information)
</Table>

(b)        REPORTS ON FORM 8-K.

           The Company filed a report on Form 8-K during the three month period
           ended March 31, 2001 on March 15, 2001 to report the closing of the
           Company's acquisition of American Independent Insurance Holding
           Company. The Company also filed a report on Form 8-K/A on May 14,
           2001 to file required financial information relating to such
           acquisition.

     Omitted from this Part II are items which are inapplicable or to which the
answer is negative for the period covered.



                                       27
<Page>

                                   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.



                                 ARCH CAPITAL GROUP LTD.
                                 ---------------------------------------------
                                 (REGISTRANT)





                                 /s/ Peter A. Appel
                                 ---------------------------------------------
Date: August 8, 2001             Peter A. Appel
                                 President & Chief Executive Officer





                                 /s/ Debra M. O'Connor
                                 ---------------------------------------------
Date: August 8, 2001             Debra M. O'Connor
                                 Senior Vice President, Controller & Treasurer



                                       28
<Page>

                                  EXHIBIT INDEX

<Table>
<Caption>
           EXHIBIT NO.                     DESCRIPTION
           -----------     ----------------------------------------------------
                        
           10              Administrative Services Agreement, between Arch
                           Capital Group Ltd. and Arch Capital Group (U.S.)
                           Inc. (filed as an exhibit to the Company's Form 10-Q
                           for the quarter ended March 31, 2001, as filed with
                           the Securities and Exchange Commission on May 15,
                           2001, and incorporated by reference)

           15              Accountants' Awareness Letter (regarding unaudited
                           interim financial information)
</Table>