AMBAC FINANCIAL GROUP INC
10-Q, 1998-08-14
SURETY INSURANCE
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
        ACT OF 1934

        FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1998

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

        COMMISSION FILE NUMBER: 1-10777



                          AMBAC FINANCIAL GROUP, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


            DELAWARE                               13-3621676
    (STATE OF INCORPORATION)           (I.R.S. EMPLOYER IDENTIFICATION NO.)
 
     ONE STATE STREET PLAZA
       NEW YORK, NEW YORK                             10004
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)            (ZIP CODE)


                                (212) 668-0340
             (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)

                                        

 
        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__
                                               -       


        As of June 30, 1998, 69,989,047 shares of Common Stock, par value $0.01
per share, (net of 691,337 treasury shares) of the Registrant were outstanding.
<PAGE>
 
                 AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

                                     INDEX
                                     -----

                                                                            PAGE
                                                                            ----
<TABLE>
<CAPTION>
PART I  FINANCIAL INFORMATION
 
Item 1.  Consolidated Financial Statements
<S>                                                                                              <C>
         Consolidated Balance Sheets - June 30, 1998                              
         and December 31, 1997.................................................................        3
                                                                                  
         Consolidated Statements of Operations - three months and six months      
         ended June 30, 1998 and June 30, 1997    June 30, 1998 and June 30, 1997..............        4
                                                                                  
         Consolidated Statements of Stockholders' Equity - six months ended       
         June 30, 1998 and June 30, 1997.......................................................        5
                                                                                  
         Consolidated Statements of Cash Flows -six months ended                  
         June 30, 1998 and June 30, 1997.......................................................        6
                                                                                  
         Notes to Consolidated Financial Statements............................................        7

Item 2.    Management's Discussion and Analysis of Financial
           Condition and Results of Operations.................................................        8

Item 3.    Quantitative and Qualitative Disclosures About
           Market Risk.........................................................................       22

PART II  OTHER INFORMATION

Item 4.    Submission of Matters to a Vote of Security Holders.................................       24

Item 6.    Exhibits and Reports on Form 8-K....................................................       25

SIGNATURES.....................................................................................       26

INDEX TO EXHIBITS..............................................................................       27
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 
                                      Ambac Financial Group, Inc. and Subsidiaries
                                              Consolidated Balance Sheets
                                          June 30, 1998 and December 31, 1997
                                                 (Dollars in Thousands)


                                                                                June 30, 1998         December 31, 1997
                                                                                 (unaudited)
Assets
<S>                                                                             <C>                     <C> 
Investments:
       Fixed income securities, at fair value
              (amortized cost of $7,506,272 in 1998 and $6,525,650 in 1997)        $7,791,952                 $6,773,844
       Short-term investments, at cost (approximates fair value)                      177,427                    136,278
       Preferred stock, at cost                                                         5,000                      5,000
                                                                               ----------------      --------------------
              Total investments                                                     7,974,379                  6,915,122

Cash                                                                                   28,490                      9,256
Securities purchased under agreements to resell                                       214,318                     85,466
Receivable for investment agreements                                                   50,163                          -
Receivable for securities sold                                                         14,725                    106,246
Investment income due and accrued                                                      87,157                     78,690
Reinsurance recoverable                                                                 4,119                      4,219
Prepaid reinsurance                                                                   202,265                    183,492
Deferred acquisition costs                                                            110,973                    105,996
Loans                                                                                 676,912                    503,192
Receivable from brokers and dealers                                                   683,192                    183,041
Other assets                                                                          188,447                    116,985
                                                                               ----------------      --------------------
              Total assets                                                        $10,235,140                 $8,291,705
                                                                               ================      ====================

Liabilities and Stockholders' Equity

Liabilities:
       Unearned premiums                                                           $1,220,701                 $1,178,990
       Losses and loss adjustment expenses                                            112,651                    103,345
       Ceded reinsurance balances payable                                               7,878                      9,258
       Obligations under investment and payment agreements                          3,731,550                  3,230,052
       Obligations under investment repurchase agreements                           1,557,845                  1,090,912
       Deferred income taxes                                                          140,478                    135,228
       Current income taxes                                                             2,263                      9,016
       Debentures                                                                     423,897                    223,864
       Accrued interest payable                                                        54,914                     46,017
       Accounts payable and other liabilities                                         181,789                    117,153
       Payable to brokers and dealers                                                 500,000                          -
       Payable for securities purchased                                               311,240                    275,388
                                                                               ----------------      --------------------
              Total liabilities                                                     8,245,206                  6,419,223
                                                                               ----------------      --------------------

Stockholders' equity:
       Preferred stock                                                                      -                          -
       Common stock                                                                       707                        707
       Additional paid-in capital                                                     512,039                    500,107
       Accumulated other comprehensive income                                         153,516                    135,223
       Retained earnings                                                            1,355,957                  1,262,740
       Common stock held in treasury at cost                                          (32,285)                   (26,295)
                                                                               ----------------      --------------------
              Total stockholders' equity                                            1,989,934                  1,872,482
                                                                               ----------------      --------------------
              Total liabilities and stockholders' equity                          $10,235,140                 $8,291,705
                                                                               ================      ====================

</TABLE> 
        See accompanying Notes to Consolidated Financial Statements

                                                                 3
<PAGE>
 
<TABLE> 
<CAPTION> 

                                   Ambac Financial Group, Inc. and Subsidiaries
                                      Consolidated Statements of Operations
                                                  (Unaudited)
                                  For the Periods Ended June 30, 1998 and 1997
                                    (Dollars in Thousands Except Share Data)


                                                        Three Months Ended               Six Months Ended
                                                             June 30,                        June 30,
                                                   -----------------------------   ------------------------------
                                                       1998           1997             1998            1997
                                                   -----------------------------   ------------------------------
<S>                                                 <C>                 <C>             <C>             <C> 
Revenues:
  Financial Guarantee Insurance:
     Gross premiums written                             $88,042         $73,740         $165,529        $125,532
     Ceded premiums written                             (10,048)         (7,195)         (36,135)        (12,627)
                                                   -------------  --------------   --------------  --------------
       Net premiums written                              77,994          66,545          129,394         112,905

     Increase in unearned premiums                      (24,676)        (30,159)         (22,892)        (39,486)
                                                   -------------  --------------   --------------  --------------
       Net premiums earned                               53,318          36,386          106,502          73,419

     Net investment income                               45,872          39,258           90,912          77,705
     Net realized (losses) gains                           (509)          3,479              666           4,291
     Other income                                           235           2,285            2,200           3,388
  Financial Management Services:
     Income                                              12,732           6,150           25,486          13,372
     Net realized (losses) gains                         (6,350)             79           (7,248)             79
  Other:
     Income                                               4,047           1,828            5,403           3,689
     Net realized gains                                     910               -            1,517             788
                                                   -------------  --------------   --------------  --------------

       Total revenues                                   110,255          89,465          225,438         176,731
                                                   -------------  --------------   --------------  --------------

Expenses:
  Financial Guarantee Insurance:
     Losses and loss adjustment expenses                  1,423             664            3,000           1,392
     Underwriting and operating expenses                 11,190           9,732           23,208          18,824
  Financial Management Services                           8,603           5,474           16,046          14,454
  Interest                                                8,782           5,303           14,394          10,544
  Other                                                   1,744             456            4,080           1,285
                                                   -------------  --------------   --------------  --------------

       Total expenses                                    31,742          21,629           60,728          46,499
                                                   -------------  --------------   --------------  --------------

Income before income taxes                               78,513          67,836          164,710         130,232
Provision for income taxes                               17,717          14,223           38,256          26,881
                                                   -------------  --------------   --------------  --------------

       Net income                                       $60,796         $53,613         $126,454        $103,351
                                                   =============  ==============   ==============  ==============


       Net income per share                               $0.87           $0.77            $1.81           $1.48
                                                   =============  ==============   ==============  ==============

       Net income per diluted share                       $0.85           $0.75            $1.77           $1.46
                                                   =============  ==============   ==============  ==============

Weighted average number of
  shares outstanding                                 70,015,177      69,957,352       70,027,486      69,922,344
                                                   =============  ==============   ==============  ==============

Weighted average number of diluted
  shares outstanding                                 71,665,662      71,093,321       71,619,424      71,008,013
                                                   =============  ==============   ==============  ==============


</TABLE> 


See accompanying Notes to Consolidated Financial Statements

                                                       4
<PAGE>
 
<TABLE> 
<CAPTION> 
                                   Ambac Financial Group, Inc. and Subsidiaries
                                 Consolidated Statements of Stockholders' Equity
                                                   (Unaudited)
                                   For the Periods Ended June 30, 1998 and 1997
                                              (Dollars in Thousands)


                                                                   1998                            1997
                                                         --------------------------      --------------------------
<S>                                                     <C>             <C>             <C>             <C> 
Retained Earnings:
       Balance at January 1                                $1,262,740                      $1,072,418
       Net income                                             126,454     $126,454            103,351     $103,351
                                                                      -------------                   -------------
       Dividends declared - common stock                      (12,593)                        (11,562)
       Exercise of stock options                              (20,644)                         (7,109)
                                                         -------------                   -------------
       Balance at June 30                                  $1,355,957                      $1,157,098
                                                         -------------                   -------------

Accumulated Other Comprehensive Income:
       Balance at January 1                                  $135,223                         $58,911
       Unrealized gains (losses)on securities,                 
         ($28,464 pre-tax and ($7,783) pre-tax in 
         1998 and 1997, respectively)(1)                                    18,120                          (4,794)
       Foreign currency                                                        173                             397
                                                                      -------------                   -------------
       Other comprehensive income (loss)                       18,293       18,293             (4,397)      (4,397)
                                                         --------------------------      --------------------------
       Comprehensive income                                               $144,747                         $98,954
                                                                      =============                   =============
       Balance at June 30                                    $153,516                         $54,514
                                                         -------------                   -------------

Preferred Stock:
       Balance at January 1 and June 30                            $-                              $-
                                                         -------------                   -------------

Common Stock:
       Balance at January 1 and June 30                          $707                            $353
                                                         -------------                   -------------

Additional Paid-in Capital:
       Balance at January 1                                  $500,107                        $498,401
       Issuance of stock                                            -                          (3,560)
       Exercise of stock options                               11,905                           4,377
       Other                                                       27                              26
                                                         -------------                   -------------
       Balance at June 30                                    $512,039                        $499,244
                                                         -------------                   -------------

Common Stock Held in Treasury at Cost:
       Balance at January 1                                  ($26,295)                       ($15,067)
       Cost of shares acquired                                (20,856)                        (32,203)
       Shares issued under equity plans                        14,866                          27,227
                                                         -------------                   -------------
       Balance at June 30                                    ($32,285)                       ($20,043)
                                                         -------------                   -------------


Total Stockholders' Equity at June 30                      $1,989,934                      $1,691,166
                                                         =============                   =============

(1) Disclosure of reclassification amount:
Unrealized holding gains (losses) arising during period       $19,580                         ($1,441)
Less: reclassification adjustment for gains
    included in net income                                      1,460                           3,353
                                                         -------------                   -------------
Net unrealized gains (losses) on securities                   $18,120                         ($4,794)
                                                         =============                   =============


</TABLE> 
See accompanying Notes to Consolidated Financial Statements.


                                                        5
<PAGE>
 
                               Ambac Financial Group, Inc. and Subsidiaries
                                   Consolidated Statements of Cash Flows
                                                (Unaudited)
                               For The Periods Ended June 30, 1998 and 1997
                                          (Dollars in Thousands)

<TABLE> 
<CAPTION> 

                                                                                    Six Months Ended
                                                                                        June 30,
                                                                             -------------------------------

                                                                                 1998              1997
                                                                             -------------     -------------
<S>                                                                             <C>             <C> 
Cash flows from operating activities:
     Net income                                                                  $126,454          $103,351
     Adjustments to reconcile net income to net cash
            provided by operating activities:
     Depreciation and amortization                                                    792               872
     Amortization of bond premium and discount                                     (2,416)             (723)
     Current income taxes                                                          (6,753)            2,254
     Deferred income taxes                                                         (5,094)            5,299
     Deferred acquisition costs                                                    (4,977)           (7,179)
     Unearned premiums, net                                                        22,938            39,499
     Losses and loss adjustment expenses                                            9,306               821
     Ceded reinsurance balances payable                                            (1,380)            4,285
     Investment income due and accrued                                             (8,467)           (3,977)
     Accrued interest payable                                                       8,897             7,751
     Loss (gain) on sales of investments                                            5,065            (5,158)
     Accounts payable and other liabilities                                        64,636           (11,916)
     Other, net                                                                   (75,256)          (12,389)
                                                                             -------------     -------------
            Net cash provided by operating activities                             133,745           122,790
                                                                             -------------     -------------

Cash flows from investing activities:
     Proceeds from sales of bonds                                                 265,478           859,455
     Proceeds from matured bonds                                                1,157,445           582,984
     Purchases of bonds                                                        (2,268,960)       (2,091,575)
     Change in short-term investments                                             (41,149)          (29,826)
     Securities purchased under agreements to resell                             (128,852)           19,087
     Loans                                                                       (173,720)                -
     Other, net                                                                   (18,138)            4,638
                                                                             -------------     -------------
            Net cash used in investing activities                              (1,207,896)         (655,237)
                                                                             -------------     -------------

Cash flows from financing activities:
     Dividends paid                                                               (12,593)          (11,562)
     Proceeds from issuance of investment agreements                            1,705,983         1,158,705
     Payments for investment agreement draws                                     (961,435)         (610,702)
     Proceeds from issuance of debentures                                         193,700                 -
     Payment agreements                                                           173,720                 -
     Proceeds from sale of treasury stock                                          14,866            27,227
     Purchases of treasury stock                                                  (20,856)          (32,203)
                                                                             -------------     -------------
            Net cash provided by financing activities                           1,093,385           531,465
                                                                             -------------     -------------

Net cash flow                                                                      19,234              (982)
Cash at January 1                                                                   9,256             7,734
                                                                             -------------     -------------
     Cash at June 30                                                              $28,490            $6,752
                                                                             =============     =============

Supplemental disclosures of cash flow information:
     Cash paid during the period for:
            Income taxes                                                          $41,250           $14,110
                                                                             =============     =============
            Interest expense on debt                                              $14,515           $10,896
                                                                             =============     =============
            Interest expense on investment agreements                            $115,551           $76,099
                                                                             =============     =============

</TABLE> 
    See accompanying Notes to Consolidated Financial Statements

                                                     6
<PAGE>
 
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS


(1)  Basis of Presentation

      Ambac Financial Group, Inc., (the "Company") headquartered in New York
City, is a holding company whose affiliates provide financial guarantee
insurance and financial management services to clients in both the public and
private sectors in the U.S. and abroad. The Company's principal operating
subsidiary, Ambac Assurance Corporation ("Ambac Assurance"), a leading insurer
of municipal and structured finance obligations, has earned triple-A claims-
paying ability ratings, the highest ratings available from Moody's Investors
Service, Inc., Fitch IBCA, Inc., and Japan Rating and Investment Information,
Inc., and a financial strength rating of triple-A from Standard & Poor's Ratings
Group. Ambac Financial Group, Inc.'s Financial Management Services segment
provides investment agreements, interest rate swaps, investment advisory and
cash management services, and electronic commerce solutions, principally to
states, municipalities and their authorities, school districts, and hospitals
and health organizations.

      The Company's consolidated unaudited interim financial statements have
been prepared on the basis of generally accepted accounting principles ("GAAP")
and, in the opinion of management, reflect all adjustments, consisting only of
normal recurring adjustments, necessary for a fair presentation of the Company's
financial condition, results of operations and cash flows for the periods
presented. 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 disclosures of contingent assets and
liabilities at the date of the financial statements and the reported revenues
and expenses during the reporting period. Actual results could differ from those
estimates. The results of operations for the three months and six months ended
June 30, 1998 may not be indicative of the results that may be expected for the
full year ending December 31, 1998. These consolidated financial statements and
notes should be read in conjunction with the financial statements and notes
included in the audited consolidated financial statements of Ambac Financial
Group, Inc. and its subsidiaries contained in (i) the Company's Annual Report on
Form 10-K for the year ended December 31, 1997, which was filed with the
Securities and Exchange Commission (the "Commission") on March 31, 1998, and
(ii) the Company's Quarterly Report on Form 10-Q for the quarterly period ended
March 31, 1998, which was filed with the Commission on May 15, 1998.

      The consolidated financial statements include the accounts of the
Company and each of its subsidiaries. All significant intercompany balances have
been eliminated.

      Certain reclassifications have been made to prior periods' amounts to
conform to the current period's presentation. In December 1997, the Company
implemented Financial Accounting Standard ("FAS") No. 128, Earnings per Share.
All prior periods presented have been restated to reflect this requirement.

      All common stock data has been retroactively adjusted to reflect the
two-for-one stock split effective September 10, 1997.

(2)   NEW ACCOUNTING STANDARDS

      As of January 1, 1998, the Company adopted FAS No. 130, Reporting
Comprehensive Income. This statement establishes standards for the reporting and
presentation of comprehensive income and its components in a full set of
financial statements. Comprehensive income 

                                       7
<PAGE>
 
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS (CONTINUED)

encompasses all changes in stockholders' equity (except those arising from
transactions with stockholders) and includes net income, net unrealized capital
gains or losses on available-for-sale securities and foreign currency
translation adjustments. As this new standard only requires additional
information in the financial statements, it does not affect the Company's
financial position or results of operations.

In June 1998, the Financial Accounting Standards Board issued Statement No. 133,
Accounting for Derivative Instruments and Hedging Activities, which is required
to be adopted in years beginning after June 15, 1999. The Company expects to
adopt the new Statement effective January 1, 2000.  The Statement will require
the Company to recognize all derivatives on the balance sheet at fair value.
Derivatives that are not hedges must be adjusted to fair value through income.
If the derivative qualifies as a hedge, depending on the nature of the hedge,
changes in the fair value of the derivative will either be offset against the
change in fair value of the hedged assets or liabilities through earnings or
recognized in other comprehensive income until the hedged item is recognized in
earnings.  The ineffective portion of a derivative's change in fair value will
be immediately recognized in earnings.

The Company uses derivatives (primarily interest rate swaps and exchange traded
futures contracts) for hedging purposes as part of its overall interest rate
risk management. The provisions of Statement 133 are applicable to all of the
Company's derivative hedge positions. The Company has not yet determined what
the effect of Statement 133 will be on the earnings and financial position of
the Company. In addition to hedging, the Company, through its affiliate, Ambac
Financial Services, L.P., uses derivatives which are classified as held for
trading purposes. All derivatives held for trading purposes are recorded at fair
value, with changes in fair value immediately recognized in earnings. As such,
Statement 133 will have no effect on derivatives held for trading purposes.


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

     The following paragraphs describe the consolidated results of operations of
Ambac Financial Group, Inc. and its subsidiaries (sometimes collectively
referred to as the "Company") for the three and six month  periods ended June
30, 1998 and 1997, and its financial condition as of June 30, 1998 and December
31, 1997. These results include the Company's two business segments: Financial
Guarantee Insurance and Financial Management Services.

     In this Form 10-Q, we make statements about our future results that are
considered "forward-looking statements" under the Private Securities Litigation
Reform Act of 1995.  These statements are based on our current expectations and
the current economic environment.  We caution you that these statements are not
guarantees of future performance.  They involve a number of risks and
uncertainties that are difficult to predict. Our actual results could differ
materially from those expressed or implied in the forward-looking statements.
Among the factors that could cause actual results to differ materially are (1)
changes in the economic or interest rate environment in the U.S. and abroad, (2)
the level of national and worldwide fixed income markets, (3) competitive
conditions and pricing levels, (4) legislative and regulatory developments, (5)
changes in tax laws and (6) other risks and uncertainties that we identify from
time to time in our public filings with the Securities and Exchange Commission.
We undertake 

                                       8
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)

no obligation to publicly correct or update any forward-looking statement if we
later become aware that it is not likely to be achieved.


RESULTS OF OPERATIONS
THREE MONTHS ENDED JUNE 30, 1998 VERSUS
THREE  MONTHS ENDED JUNE 30, 1997

     CONSOLIDATED NET INCOME

     The Company's net income for the three months ended June 30, 1998 was $60.8
million or $0.85 per diluted share. This represents a 13% increase from the
three months ended June 30, 1997 net income of $53.6 million, and a 13% increase
in net income per diluted share from $0.75 for the prior period. This increase
in net income was primarily attributable to the growth in net premiums earned
and increased investment income from the Financial Guarantee Insurance segment.

     FINANCIAL GUARANTEE INSURANCE

     Gross Par Written.  Ambac Assurance insured $16.3 billion in par value
     -----------------                                                     
bonds during the three months ended June 30, 1998, an increase of 58% from $10.3
billion in the three months ended June 30, 1997. Par value written for the
second quarter of 1998 was comprised of  $8.6 billion from domestic municipal
bond obligations, $6.5 billion from domestic structured finance obligations and
$1.2 billion from international obligations, compared to $7.3 billion, $2.4
billion and  $0.6 billion, respectively, in the second quarter of 1997. The
increase in insured domestic municipal bond obligations resulted primarily from
increased market issuance, partially offset by Ambac Assurance's lower market
share for the quarter. The increase in insured domestic structured finance
obligations was principally in the mortgage-backed/home equity loan and asset-
backed sectors.  The increase in insured international obligations resulted from
greater acceptance of financial guarantee insurance, primarily in Europe and
Japan.

     Management believes that in the foreseeable future, domestic structured
finance and international markets will grow more rapidly than the domestic
municipal market. Domestic structured finance and international insured par may
see large quarterly variances, primarily due to the developmental nature of
these markets.

     Ambac serves clients in international markets through its wholly-owned
subsidiary Ambac Insurance UK Limited and through its participation in MBIA-
AMBAC International, a joint venture with MBIA Insurance Corporation.

     Gross Premiums Written. Gross premiums written for the three months ended
     ----------------------                                                   
June 30, 1998 were $88.0 million, an increase of 19% from $73.7 million in the
three months ended June 30, 1997. The following table sets forth the amounts of
gross premiums written by type and percent of total:

                                       9
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)  

<TABLE>
<CAPTION>
                                                                                       Three Months Ended June 30,
                                                                     -------------------------------------------------------------
(Dollars in Millions)                                                     1998             %               1997              %
                                                                     ------------    ----------       -------------    -----------
<S>                                                                    <C>             <C>              <C>              <C>
Domestic:
Municipal finance policies:
Up-front policies:
   New issue......................................................          $49.8            56%              $47.7             65%
   Secondary market...............................................            7.8             9                 7.3             10
                                                                     ------------    ----------       -------------    -----------
    Sub-total up-front............................................           57.6            65                55.0             75
                                                                     ------------    ----------       -------------    -----------
    Installment policies:
   Annual policies................................................            3.5             4                 3.0              4
   Portfolio products.............................................            0.6             1                 0.8              1
                                                                     ------------    ----------       -------------    -----------

       Sub-total installment......................................            4.1             5                 3.8              5
                                                                     ------------    ----------       -------------    -----------
      Total municipal finance policies............................           61.7            70                58.8             80
                                                                     ------------    ----------       -------------    -----------
Structured finance policies:
   Up-front.......................................................            0.7             1                 0.6              1
   Installment....................................................            8.1             9                 4.5              6
                                                                     ------------    ----------       -------------    -----------
        Total structured finance policies.........................            8.8            10                 5.1              7
                                                                     ------------    ----------       -------------    -----------
          Total  domestic written.................................           70.5            80                63.9             87
                                                                     ------------    ----------       -------------    -----------
International:
         Up-front.................................................           14.9            17                 8.3             11
         Installment..............................................            2.6             3                 1.5              2
                                                                     ------------    ----------       -------------    -----------
          Total  international written............................           17.5            20                 9.8             13
                                                                     ------------    ----------       -------------    -----------
          Total  gross premiums written...........................          $88.0           100%              $73.7            100%
                                                                     ============    ==========       =============    ===========

Total up-front written............................................          $73.2            83%              $63.9             87%
Total installment written.........................................           14.8            17                 9.8             13
                                                                     ------------    ----------       -------------    -----------
Total  gross premiums written.....................................          $88.0           100%              $73.7            100%
                                                                     ============    ==========       =============    ===========
</TABLE>


     Ceded Premiums Written. Ceded premiums written for the second quarter of
     ----------------------                                                  
1998 were $10.0 million, compared to $7.2 million in the second quarter of 1997.
The 39% increase in ceded premiums written is broken out as follows: (i) an
increase of $1.5 million ceded on international policies; and (ii) an increase
of $1.4 million ceded on municipal finance policies. Ceded premiums written were
11.4% and 9.8% of gross premiums written for the three months ended June 30,
1998 and 1997, respectively.

     Net Premiums Written.  Net premiums written for the three months ended June
     --------------------                                                       
30, 1998 were $78.0 million, an increase of 17% from $66.5 million in the three
months ended June 30, 1997. This increase reflects higher gross premiums
written, partially offset by higher premiums ceded to reinsurers in the three
months ended June 30, 1998 compared with the corresponding prior period.

     Net Premiums Earned. Net premiums earned during the three months ended June
     -------------------                                                        
30, 1998 were $53.3 million, an increase of 46% from $36.4 million in the three
months ended June 30, 1997. The increase was primarily the result of increased
premiums earned from refundings, calls, and other accelerations and an increase
in premiums earned from the underlying book of business. Net premiums earned for
the three months ended June 30, 1998 included $13.9 million (which had a net
income per diluted share effect of $0.11) from refundings, calls and other
accelerations of previously insured issues. Net premiums earned in the three
months ended June 30, 1997 included $5.8 million (which had a net income per
diluted share effect of $0.05) from refundings, calls and other accelerations.
Refunding levels vary depending upon a 

                                       10
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)  

number of conditions, primarily the relationship between current interest rates
and interest rates on outstanding debt. Excluding the effect of accelerated
earnings from refundings, calls and other accelerations, net premiums earned for
the three months ended June 30, 1998 were $39.5 million, an increase of 29% from
$30.6 million in the three months ended June 30, 1997.

     Net Investment Income. Net investment income for the three months ended
     ---------------------                                                  
June 30, 1998 was $45.9 million, an increase of 17% from $39.3 million in the
three months ended June 30, 1997. The increase was primarily attributable to the
growth of the investment portfolio from ongoing operations and the net increase
in the investment portfolio from the acquisition of Connie Lee Insurance Company
("Connie Lee") in December, 1997. Ambac Assurance's investments in tax-exempt
securities amounted to 71% of the total market value of its portfolio as of June
30, 1998, versus 80% at June 30, 1997. The average pre-tax yield-to-maturity on
the investment portfolio was 6.39% and 6.40% as of June 30, 1998 and 1997,
respectively.

     Net Realized (Losses) Gains. Net realized losses were $0.5 million for the
     ---------------------------                                               
three months ended June 30, 1998, compared to $3.5 million in net realized gains
for the comparative prior period in 1997.

     Other Income.  Other income was $0.2 million for the three months ended
     -------------                                                          
June 30, 1998, compared to $2.3 million for the three months ended June 30,
1997. This decrease was primarily due to lower income from certain real estate
interests.

     Losses and Loss Adjustment Expenses. Losses and loss adjustment expenses
     -----------------------------------                                     
for the three months ended June 30, 1998 were $1.4 million, versus $0.7 million
for the three months ended June 30, 1997. Salvage received was $5.5 million and
$0 for the three months ended June 30, 1998 and 1997, respectively. The Company
increased the contribution to the loss reserve for the entire amount of salvage
received. The increase was a result of the growth in the insured book of
business, as loss expenses and related reserves are based upon estimates of the
ultimate aggregate losses inherent in the obligations insured.

     Underwriting and Operating Expenses. Underwriting and operating expenses
     -----------------------------------                                     
for the second quarter of 1998 were $11.2 million, an increase of 15% from $9.7
million in the second quarter of 1997, primarily as a result of higher
compensation costs. Underwriting and operating expenses consist of gross
underwriting and operating expenses, less the deferral to future periods of
expenses and reinsurance commissions related to the acquisition of new insurance
contracts, plus the amortization of previously deferred expenses and reinsurance
commissions. During the three months ended June 30, 1998, gross underwriting and
operating expenses were $16.4 million, an increase of 14% from $14.4 million in
the three months ended June 30, 1997. This increase reflects the overall
increased business activity during the period. Underwriting and operating
expenses deferred were $9.5 million and $8.0 million for the three months ended
June 30, 1998 and 1997, respectively. Reinsurance commissions which related to
the current period (net of deferred) were $0.3 million and $0 for the three
months ended June 30, 1998 and 1997, respectively. The amortization of
previously deferred expenses and reinsurance commissions was $4.6 million and
$3.3 million for the three months ended June 30, 1998 and 1997, respectively.

                                       11
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)  


     FINANCIAL MANAGEMENT SERVICES

     Through its financial management services subsidiaries, the Company
provides investment agreements, interest rate swaps, investment advisory and
cash management services, and electronic commerce solutions, principally to
states, municipalities and their authorities, school districts, and hospitals
and health organizations. Revenues for the three months ended June 30, 1998 were
$12.7 million (excludes $6.4 million in net realized losses), up 105% from $6.2
million (excludes $0.1 million in net realized gains) for the three months ended
June 30, 1997. This increase is primarily due to (i) higher revenues on interest
rate swaps which totaled $5.1 million in the period, up 410% from $1.0 million
in the comparable prior period, and (ii) higher investment agreement revenue
which totaled $5.0 million in the period, up 79% on increased volume, from $2.8
million in the comparable prior period. A small percentage of the Company's
investment portfolio is maintained as a trading position. This position contains
high quality municipal bonds hedged with treasury futures. A change in the
relationship between municipal bonds and treasury bonds has created a mark-to-
market loss in the second quarter of 1998 equal to $6.4 million. Expenses for
the second quarter of 1998 were $8.6 million, up 56% from $5.5 million in the
second quarter of 1997. This increase results from higher compensation expenses
in the investment agreement and swap businesses, as well as increased
expenditures to develop the money management and electronic commerce businesses.

     CORPORATE ITEMS

     Other Revenue. Other revenue includes investment income of the holding
     -------------                                                         
company, Ambac Financial Group, Inc. Other revenue for the three months ended
June 30, 1998 was $4.0 million, up 122% from $1.8 million for the comparable
prior period. The increase is attributable to higher investment income generated
from investing the proceeds of the Company's issuance of $200 million in
debentures on April 1, 1998.

     Interest Expense. Interest expense for the three months ended June 30, 1998
     ----------------                                                           
was $8.8 million, up 66% from $5.3 million for the three months ended June 30,
1997. The increase is attributable to the Company's issuance of $200 million in
debentures (see Liquidity and Capital Resources section) on April 1, 1998.

     Income Taxes. Income taxes for the three months ended June 30, 1998 were at
     ------------                                                               
an effective rate of 22.6%, versus 20.9% in the three months ended June 30,
1997. This increase was primarily due to the higher level of pre-tax income and
a lower percentage of tax-exempt investment income.

     SUPPLEMENTAL ANALYTICAL FINANCIAL DATA

     Management, equity analysts and investors consider the following four
measures important in analyzing the financial results, and measuring the
intrinsic value of the Company: core earnings; operating earnings; adjusted
gross premiums written; and adjusted book value. However, none of these measures
are promulgated in accordance with GAAP and should not be considered as
substitutes for net income, gross premiums written and book value. The
definitions of core earnings, operating earnings, adjusted gross premiums
written and adjusted 

                                       12
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)  


book value described below may differ from the definitions used by other public
holding companies of financial guarantee insurers.

     Core Earnings. Core earnings for the three months ended June 30, 1998 were
     -------------                                                             
$56.8 million, an increase of 18% from $48.0 million for the three months ended
June 30, 1997. The increase in core earnings was primarily the result of
continued higher premiums earned from the growth in the insurance book of
business and higher net investment income from insurance operations, as well as
higher revenues from the investment agreement and swap businesses in the
financial management services segment. The Company defines core earnings as
consolidated net income, less the effect of net realized gains and losses, net
insurance premiums earned from refundings and calls and certain non-recurring
items.

     Operating Earnings. Operating earnings for the second quarter of 1998 were
     ------------------                                                        
$64.7 million, an increase of 26% from $51.3 million in the second quarter of
1997. The Company defines operating earnings as consolidated net income, less
the effect of net realized gains and losses and certain non-recurring items.

          The following table reconciles net income computed in accordance with
GAAP to operating earnings and core earnings for the three months ended June 30,
1998 and 1997:

<TABLE>
<CAPTION>
(Dollars in Millions)                                                                               1998                  1997
                                                                                             ----------------      ----------------
 
<S>                                                                                            <C>                   <C>
Net Income...................................................................................           $60.8                 $53.6
 
Net realized losses (gains), after tax.......................................................             3.9                  (2.3)
                                                                                             ----------------      ----------------
 
   Operating earnings........................................................................            64.7                  51.3
 
Premiums earned from refundings, calls and other accelerations, after tax....................            (7.9)                 (3.3)
                                                                                             ----------------      ----------------
 
   Core earnings.............................................................................           $56.8                 $48.0
                                                                                             ================      ================
</TABLE>


     The weighted average number of diluted shares outstanding during the second
quarter of 1998 and 1997 was 71.7 million and 71.1 million, respectively.

     Adjusted Gross Premiums Written. Adjusted gross premiums written were
     -------------------------------                                      
$114.4 million in the second quarter of 1998, up 43% from $79.8 million in the
second quarter of 1997. The Company defines adjusted gross premiums written as
up-front premiums written (less amounts ceded to MBIA Insurance Corporation
under our international joint venture) plus the present value of estimated
future installment premiums written in the period. While most premiums are
collected up-front at policy issuance, a growing portion of premiums are
collected on an installment basis. The net present value of estimated future
installment premiums written in the second quarter of 1998 was $46.5 million, an
increase of 138% from $19.5 million written in the second quarter of 1997. The
aggregate net present value of estimated future installment premiums was $249.8
million and $210.8 million as of June 30, 1998 and December 31, 1997,
respectively.

     The following table reconciles total up-front premiums written to adjusted
gross premiums written for the three months ended June 30, 1998 and 1997:

                                       13
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)   



<TABLE>
<CAPTION>
(Dollars in Millions)                                                                               1998                 1997
                                                                                             ----------------     ----------------
 
Adjusted Gross Premium Analysis (1):
 
<S>                                                                                            <C>                  <C>
Total Up-front premiums written..............................................................          $ 67.9                $60.3
 
PV of estimated future installment premiums..................................................            46.5                 19.5
                                                                                             ----------------     ----------------
    Adjusted gross premiums written..........................................................          $114.4                $79.8
                                                                                             ================     ================
</TABLE>

(1) Excludes amounts ceded to MBIA Insurance Corporation under our international
joint venture of $8.2 million and $4.7 million for the three months ended June
30, 1998 and 1997, respectively.

     Adjusted Book Value. Adjusted book value ("ABV") per common share increased
     -------------------                                                        
5% to $38.57 at June 30, 1998 compared to $36.59 at December 31, 1997.  The
Company derives ABV by beginning with stockholders' equity (book value) and
adding or subtracting the after-tax value of: the net unearned premium reserve;
deferred acquisition costs; the present value of estimated net future
installment premiums; and the unrealized gain or loss on investment agreement
liabilities. These adjustments will not be realized until future periods and may
differ materially from the amounts used in determining ABV.

     The following table reconciles book value per share to ABV per share as of
June 30, 1998 and December 31, 1997:

<TABLE>
<CAPTION>
                                                                                      June 30,                    December 31,
                                                                                        1998                          1997
                                                                           ---------------------------   ---------------------------
 
<S>                                                                          <C>                              <C>
Book value per share..................................................                          $28.43                    $26.77
After-tax value of:                                                                                                 
  Net unearned premium reserve........................................                            9.46                      9.25
  Deferred acquisition costs..........................................                           (1.03)                    (0.99)
  Present value of installment premiums...............................                            2.32                      1.96
  Unrealized gain on investment agreement liabilities.................                           (0.61)                    (0.40)
                                                                           ---------------------------   ---------------------------
Adjusted book value per share.........................................                          $38.57                    $36.59
                                                                           ===========================   ===========================
</TABLE>



RESULTS OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1998 VERSUS
SIX MONTHS ENDED JUNE 30, 1997

     CONSOLIDATED NET INCOME

     The Company's net income for the six months ended June 30, 1998 was $126.5
million or $1.77 per diluted share. This represents a 22% increase from the
comparable prior period net income of $103.4 million, and a 21% increase in net
income per diluted share from $1.46. This increase in net income was primarily
attributable to the growth in net premiums earned and increased investment
income from the Financial Guarantee Insurance segment as well as higher
operating income in the Financial Management Services segment.

     FINANCIAL GUARANTEE INSURANCE

     Gross Par Written.  Ambac Assurance insured $30.9 billion in par value
     -----------------                                                     
bonds during the six months ended 

                                       14
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    

June 30, 1998, an increase of 70% from $18.2 billion in the six months ended
June 30, 1997. Par value written for the six months ended June 30, 1998 was
comprised of $17.7 billion from domestic municipal bond obligations, $11.0
billion from domestic structured finance obligations and $2.2 billion from
international obligations, compared to $12.6 billion, $4.8 billion and $0.8
billion, respectively, in the six months ended June 30, 1997. The increase in
insured domestic municipal bond obligations resulted primarily from increased
market issuance. The increase in insured domestic structured finance obligations
was principally in the mortgage-backed/home equity loan and asset-backed
sectors. The increase in insured international obligations resulted from greater
acceptance of financial guarantee insurance, primarily in Europe and Japan.

     Management believes that in the foreseeable future, domestic structured
finance and international markets will grow more rapidly than the domestic
municipal market. Domestic structured finance and international insured par may
see large quarterly variances, primarily due to the developmental nature of
these markets.

     Ambac serves clients in international markets through its wholly-owned
subsidiary Ambac Insurance UK Limited and through its participation in MBIA-
AMBAC International, a joint venture with MBIA Insurance Corporation.

     Gross Premiums Written. Gross premiums written for the six months ended
     ----------------------                                                 
June 30, 1998 were $165.5 million, an increase of 32% from $125.5 million in the
six months ended June 30, 1997. The following table sets forth the amounts of
gross premiums written by type and percent of total:

<TABLE>
<CAPTION>
                                                                                         Six Months Ended June 30
                                                            ---------------------------------------------------------------------
(Dollars in Millions)                                               1998                %                1997                %
                                                            --------------    --------------     --------------    --------------
Domestic:
Municipal finance policies:
Up-front policies:
<S>                                                          <C>               <C>                <C>               <C>
   New issue.............................................          $ 99.3                60%            $ 79.6                63%
   Secondary market......................................            10.7                 7               11.9                10
                                                           --------------    --------------     --------------    --------------

    Sub-total up-front...................................           110.0                67               91.5                73
                                                           --------------    --------------     --------------    --------------
    Installment policies:
   Annual policies.......................................             5.6                 3                4.8                 4
   Portfolio products....................................             1.2                 1                1.6                 1
                                                           --------------    --------------     --------------    --------------


       Sub-total installment.............................             6.8                 4                6.4                 5
                                                           --------------    --------------     --------------    --------------
      Total municipal finance policies...................           116.8                71               97.9                78
                                                           --------------    --------------     --------------    --------------
Structured finance policies:
   Up-front..............................................             0.7                 -                7.8                 6
   Installment...........................................            14.8                 9                8.2                 7
                                                           --------------    --------------     --------------    --------------
        Total structured finance policies................            15.5                 9               16.1                13
                                                           --------------    --------------     --------------    --------------
          Total  domestic written........................           132.3                80              114.0                91
                                                           --------------    --------------     --------------    --------------
International:
         Up-front........................................            28.5                17                9.1                 7
         Installment.....................................             4.7                 3                2.5                 2
                                                           --------------    --------------     --------------    --------------
          Total  international written...................            33.2                20               11.6                 9
                                                           --------------    --------------     --------------    --------------
          Total  gross premiums written..................          $165.5               100%            $125.5               100%
                                                           ==============    ==============     ==============    ==============

Total up-front written...................................          $139.2                84%            $108.4                86%
Total installment written................................            26.3                16               17.1                14
                                                           --------------    --------------     --------------    --------------
Total  gross premiums written............................          $165.5               100%            $125.5               100%
                                                           ==============    ==============     ==============    ==============
</TABLE>

                                       15
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    


     Ceded Premiums Written. Ceded premiums written for the first six months of
     ----------------------                                                    
1998 were $36.1 million, compared to $12.6 million in the first six months of
1997. The 187% increase in ceded premiums written is broken down as follows: (i)
the reinsurance of $11.8 million of the portfolio purchased through the
acquisition of Connie Lee; (ii) an increase of $7.7 million ceded on
international policies; and (iii) an increase of $4.1 million ceded on municipal
finance policies. Ceded premiums written were 21.8% (14.7% excluding the Connie
Lee reinsurance transaction) and 10.0% of gross premiums written for the six
months ended June 30, 1998 and 1997, respectively.

     Net Premiums Written.  Net premiums written for the six months ended June
     --------------------                                                     
30, 1998 were $129.4 million, an increase of 15% from $112.9 million in the six
months ended June 30, 1997. This increase reflects higher gross premiums
written, partially offset by higher premiums ceded to reinsurers in the six
months ended June 30, 1998 compared with the corresponding prior period.

     Net Premiums Earned. Net premiums earned during the six months ended June
     -------------------                                                      
30, 1998 were $106.5 million, an increase of 45% from $73.4 million in the six
months ended June 30, 1997. The increase was primarily the result of increased
premiums earned from refundings, calls, and other accelerations and an increase
in premiums earned from the underlying book of business. Net premiums earned for
the six months ended June 30, 1998 included $30.2 million (which had a net
income per diluted share effect of $0.24) from refundings, calls and other
accelerations of previously insured issues. Net premiums earned in the six
months ended June 30, 1997 included $13.4 million (which had a net income per
diluted share effect of $0.11) from refundings, calls and other accelerations.
Refunding levels vary depending upon a number of conditions, primarily the
relationship between current interest rates and interest rates on outstanding
debt. Excluding the effect of accelerated earnings from refundings, calls and
other accelerations, net premiums earned for the six months ended June 30, 1998
were $76.3 million, an increase of 27% from $60.0 million in the six months
ended June 30, 1997.

     Net Investment Income. Net investment income for the six months ended June
     ---------------------                                                     
30, 1998 was $90.9 million, an increase of 17% from $77.7 million in the six
months ended June 30, 1997. The increase was primarily attributable to the
growth of the investment portfolio from ongoing operations and the net increase
in the investment portfolio from the acquisition of Connie Lee.

     Net Realized Gains. Net realized gains were $0.7 million for the six months
     ------------------                                                         
ended June 30, 1998, compared to $4.3 million in net realized gains for the
comparative prior period in 1997.

     Other Income.  Other income was $2.2 million for the six months ended June
     -------------                                                             
30, 1998, compared to $3.4 million for the six months ended June 30, 1997. This
decrease was primarily due to lower income from certain real estate interests.

     Losses and Loss Adjustment Expenses. Losses and loss adjustment expenses
     -----------------------------------                                     
for the six months ended June 30, 1998 were $3.0 million, versus $1.4 million
for the six months ended June 30, 1997. Salvage received was $7.2 million and $0
for the six months ended June 30, 1998 and 1997, respectively. The Company
increased the contribution to the loss reserve for the entire amount of salvage
received. The increase was a result of the growth in the insured book 

                                       16
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    

of business, as loss expenses and related reserves are based upon estimates of
the ultimate aggregate losses inherent in the obligations insured.

     Underwriting and Operating Expenses. Underwriting and operating expenses
     -----------------------------------                                     
for the six months ended June 30, 1998 were $23.2 million, an increase of 23%
from $18.8 million in the six months ended June 30, 1997, primarily as a result
of higher compensation expenses and higher amortization of previously deferred
acquisition costs during the period. Underwriting and operating expenses consist
of gross underwriting and operating expenses, less the deferral to future
periods of expenses and reinsurance commissions related to the acquisition of
new insurance contracts, plus the amortization of previously deferred expenses
and reinsurance commissions. During the six month period ended June 30, 1998,
gross underwriting and operating expenses were $31.9 million, an increase of 14%
from $28.0 million in the six months ended June 30, 1997. This increase reflects
the overall increased business activity during the period. Underwriting and
operating expenses deferred were $17.7 million and $15.9 million for the six
months ended June 30, 1998 and 1997, respectively. Reinsurance commissions which
related to the current period (net of deferred) were $0.4 million and $0 for the
six months ended June 30, 1998 and 1997, respectively. The amortization of
previously deferred expenses and reinsurance commissions was $9.4 million and
$6.7 million for the six months ended June 30, 1998 and 1997, respectively.

     FINANCIAL MANAGEMENT SERVICES

     Revenues for the six months ended June 30, 1998 were $25.5 million
(excludes $7.2 million in net realized losses), up 90% from $13.4 million
(excludes $0.1 million in net realized gains) for the six months ended June 30,
1997. This increase is primarily due to (i) higher revenues on interest rate
swaps which totaled $10.5 million in the period, up 250% from $3.0 million in
the comparable prior period, and (ii) higher investment agreement revenue which
totaled $9.7 million in the period, up 67% on increased volume, from $5.8
million in the comparable prior period. A small percentage of the Company's
investment portfolio is maintained as a trading position. This position contains
high quality municipal bonds hedged with treasury futures. A change in the
relationship between municipal bonds and treasury bonds has created a mark-to-
market loss in the first six months of 1998 equal to $7.3 million. Expenses for
the six months ended June 30,1998 were $16.0 million, up 10% from $14.5 million
in the six months ended June 30, 1997. This increase results from higher
compensation expenses in the investment agreement and swap businesses, as well
as increased expenditures to develop the money management and electronic
commerce businesses, partially offset by a one-time $3.5 million restructuring
charge in 1997.

     CORPORATE ITEMS

     Other Revenue. Other revenue includes investment income of the holding
     -------------                                                         
company, Ambac Financial Group, Inc. Other revenue for the six months ended June
30, 1998 was $5.4 million, up 46% from $3.7 million for the comparable prior
period. The increase is attributable to higher investment income generated from
investing the proceeds of the Company's issuance of $200 million in debentures
on April 1, 1998.

                                       17
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    


     Interest Expense. Interest expense for the six months ended June 30, 1998
     ----------------                                                         
was $14.4 million, up 37% from $10.5 million for the six months ended June 30,
1997, primarily due to the Company's issuance of $200 million in debentures (see
Liquidity and Capital Resources section) on April 1, 1998.

     Income Taxes. Income taxes for the six months ended June 30, 1998 were at
     ------------                                                             
an effective rate of 23.2%, versus 20.6% in the six months ended June 30, 1997.
This increase was primarily due to the higher level of pre-tax income and a
lower percentage of tax-exempt investment income.

     SUPPLEMENTAL ANALYTICAL FINANCIAL DATA

     Core Earnings. Core earnings for the six months ended June 30, 1998 were
     -------------                                                           
$112.5 million, an increase of 19% from $94.5 million for the six months ended
June 30, 1997. The increase in core earnings was primarily the result of
continued higher premiums earned from the growth in the insurance book of
business and higher net investment income from insurance operations, as well as
higher revenues from the investment agreement and swap businesses in the
financial management services segment. The Company defines core earnings as
consolidated net income, less the effect of net realized gains and losses, net
insurance premiums earned from refundings and calls and certain non-recurring
items.

     Operating Earnings. Operating earnings for the six months ended June 30,
     ------------------                                                      
1998 were $129.7 million, an increase of 27% from $102.1 million in the six
months ended June 30, 1997. The Company defines operating earnings as
consolidated net income, less the effect of net realized gains and losses and
certain non-recurring items.

          The following table reconciles net income computed in accordance with
GAAP to operating earnings and core earnings for the six months ended June 30,
1998 and 1997:

<TABLE>
<CAPTION>
(Dollars in Millions)                                                                               1998                  1997
                                                                                             ----------------      ----------------
 
<S>                                                                                            <C>                   <C>
Net Income...................................................................................          $126.5                $103.4
 
Net realized losses (gains), after tax.......................................................             3.2                  (3.4)
 
Non-recurring item, after tax................................................................               -                   2.1
                                                                                             ----------------      ----------------
 
   Operating earnings........................................................................           129.7                 102.1
 
Premiums earned from refundings, calls and other accelerations, after tax....................           (17.2)                 (7.6)
                                                                                             ----------------      ----------------
 
   Core earnings.............................................................................          $112.5                $ 94.5
                                                                                             ================      ================
</TABLE>

     The weighted average number of diluted shares outstanding during the six
months ended June 30, 1998 and 1997 was 71.6 million and 71.0 million,
respectively.

     Adjusted Gross Premiums Written. Adjusted gross premiums written were
     -------------------------------                                      
$199.6 million in the six months ended June 30, 1998, up 34% from $148.7 million
in the six months ended June 30, 1997. The Company defines adjusted gross
premiums written as up-front premiums written (less amounts ceded to MBIA
Insurance Corporation under our international joint venture) plus the present
value of estimated future installment premiums written in the period. While most
premiums are collected up-front at policy issuance, a growing portion of
premiums 

                                       18
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    


are collected on an installment basis. The net present value of estimated future
installment premiums written in the six months ended June 30, 1998 was $71.6
million, an increase of 61% from $44.4 million written in the six months ended
June 30, 1997. The aggregate net present value of estimated future installment
premiums was $249.8 million and $210.8 million as of June 30, 1998 and December
31, 1997, respectively.

     The following table reconciles total up-front premiums written to adjusted
gross premiums written for the six months ended June 30, 1998 and 1997:

<TABLE>
<CAPTION>
(Dollars in Millions)                                                                               1998                 1997
                                                                                             ----------------     ----------------
 
Adjusted Gross Premium Analysis (1):
 
<S>                                                                                            <C>                  <C>
Total Up-front premiums written..............................................................          $128.0               $104.3
 
PV of estimated future installment premiums..................................................            71.6                 44.4
                                                                                             ----------------     ----------------
    Adjusted gross premiums written..........................................................          $199.6               $148.7
                                                                                             ================     ================
</TABLE>

(1)  Excludes amounts ceded to MBIA Insurance Corporation under our
     international joint venture of $15.5 million and $5.1 million for the six
     months ended June 30, 1998 and 1997, respectively.

LIQUIDITY AND CAPITAL RESOURCES

     Ambac Financial Group, Inc. Liquidity. The Company's liquidity, both on a
     --------------------------------------                                   
short-term basis (for the next twelve months) and a long-term basis (beyond the
next twelve months), is largely dependent upon Ambac Assurance's ability to pay
dividends or make payments to the Company and external financings.

     Pursuant to Wisconsin insurance laws, Ambac Assurance may declare
dividends, provided that, after giving effect to the distribution, it would not
violate certain statutory equity, solvency and asset tests. During the six
months ended June 30, 1998, Ambac Assurance paid dividends of $24.0 million on
its common stock to the Company.

     The Company's principal uses of liquidity are for the payment of its
operating expenses, interest on its debt, dividends on its shares of common
stock and capital investments in its subsidiaries. Based on the amount of
dividends that Ambac Assurance expects to pay during 1998 and the income it
expects to receive from its investment portfolio, the Company believes it will
have sufficient liquidity to satisfy its liquidity needs over the next twelve
months, including the payment of dividends on the Common Stock in accordance
with its dividend policy. Beyond the next twelve months, Ambac Assurance's
ability to declare and pay dividends to the Company may be influenced by a
variety of factors, including adverse market changes, insurance regulatory
changes and changes in general economic conditions. Consequently, although the
Company believes that it will continue to have sufficient liquidity to meet its
debt service and other obligations over the long term, no guarantee can be given
that Ambac Assurance will be permitted to dividend amounts sufficient to pay all
of the Company's operating expenses, debt service obligations and cash dividends
on its Common Stock.

     On April 1, 1998, the Company issued $200.0 million in principal amount of
its 7.08% debentures due on March 31, 2098. The Company may not redeem the
debentures prior to March 31, 2003. On or after March 31, 2003, the Company may
redeem the debentures, in whole at any time or in part from time to time, at
100% of their principal amount, plus accrued 

                                       19
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    

interest to the date of redemption. Use of the net proceeds received from the
sale of the debentures will be for general corporate purposes, which include
additions to working capital of subsidiaries, acquisitions, and repurchases of
common stock. These debentures are listed on the New York Stock Exchange.

     Ambac Assurance Liquidity.  The principal uses of Ambac Assurance's
     --------------------------                                         
liquidity are the payment of operating expenses, reinsurance premiums, income
taxes and dividends to the Company. The Company believes that Ambac Assurance's
operating liquidity needs can be funded exclusively from its operating cash
flow. The principal sources of Ambac Assurance's liquidity are gross premiums
written, scheduled investment maturities and net investment income. The majority
of premiums for Ambac Assurance's financial guarantee insurance policies are
payable in full at the outset of the term of the policy, even though premiums
are earned over the life of such policies for financial accounting purposes.

     Financial Management Services Liquidity. The principal uses of liquidity by
     ----------------------------------------                                   
the Company's financial management services subsidiaries are the payment of
investment agreement obligations pursuant to defined terms, net obligations
under interest rate swaps and related hedges, operating expenses and income
taxes. The Company believes that its financial management services liquidity
needs can be funded primarily from its operating cash flow and the maturity of
its invested assets. The principal sources of this segments liquidity are
proceeds from issuance of investment agreements, net investment income,
maturities of securities from its investment portfolio which are invested with
the objective of matching the duration of its obligations under the investment
agreements, net receipts from interest rate swaps and related hedges and fees
for investment management services. The Company's investment objectives with
respect to investment agreements are to achieve the highest after-tax total
return, subject to a minimum average quality rating of Aa/AA on invested assets,
and to maintain cash flow matching of invested assets to funded liabilities to
minimize interest rate and liquidity exposure. The Company maintains a portion
of its financial management services assets in short-term investments and
repurchase agreements in order to meet unexpected liquidity needs.

     Credit Facilities.  The Company and Ambac Assurance have a $150.0 million
     ------------------                                                       
revolving credit facility with three major international banks. The facility
expires August, 1999 and provides a two-year term loan provision. The facility
is available for general corporate purposes, including the payment of claims and
has replaced a $100.0 million credit facility which expired August, 1998. As of
June 30, 1998 and 1997, no amounts were outstanding under this credit facility.

     Ambac Assurance has an agreement with a group of AAA/Aaa-rated
international banks for a $450.0 million credit facility, expiring December 2,
2004.  This facility is a seven-year stand-by irrevocable limited recourse line-
of-credit, which will provide liquidity to Ambac Assurance in the event that
claims from municipal obligations exceed specified levels. Repayment of any
amounts drawn under the line will be limited primarily to the amount of any
recoveries of losses related to policy obligations. As of June 30, 1998 and
1997, no amounts were outstanding under this line.

     Connie Lee has an agreement with commercial banks for a $50.0 million
standby credit facility, expiring in 2003. The line will provide a source of
additional claims-paying resources for insured transactions. The obligation to
repay is a limited recourse obligation payable solely from, 

                                       20
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    


and collateralized by, a pledge of recoveries realized on defaulted insured
obligations including installment premiums and other collateral. As of June 30,
1998, no amounts were outstanding under this line.

     Stock Repurchase Program.  The Board of Directors of the Company has
     -------------------------                                           
authorized the establishment of a stock repurchase program which permits the
repurchase of up to 6,000,000 shares of the Company's Common Stock. During the
six months ended June 30, 1998, the Company acquired approximately 458,000
shares for an aggregate amount of $25.7 million. Since inception of the Stock
Repurchase Program, the Company has acquired approximately 3,730,000 shares for
an aggregate amount of $115.6 million.

     Balance Sheet. As of June 30, 1998, the fair value of the Company's
     --------------                                                     
consolidated investment portfolio was $7.97 billion, an increase of 15% from
$6.92 billion at December 31, 1997. This increase was primarily due to the
increased volume in investment and payment agreements and cash flow from
operations.

     Cash Flows. Net cash provided by operating activities was $133.7 million
     -----------                                                             
and $122.8 million during the six months ended June 30, 1998 and 1997,
respectively. These cash flows were primarily provided from insurance
operations. Net cash provided by financing activities was $1,093.4 and $531.5
million during the six months ended June 30, 1998 and 1997, respectively. This
activity included $744.5 million and $548.0 million in investment agreements
issued (net of draws paid) in the six months ended June 30, 1998 and 1997,
respectively. The total cash provided by operating and financing activities was
$1,227.1 million and $654.3 million for the six months ended June 30, 1998. From
these totals, $1,207.9 million and $655.2 million was used in investing
activities, principally purchases of investment securities, during the six
months ended June 30, 1998 and 1997, respectively.

     Material Commitments. The Company has made no commitments for material
     ---------------------                                                 
capital expenditures within the next twelve months. However, management
continually evaluates opportunities to expand the Company's businesses through
internal development of new products as well as acquisitions.

     Year 2000.  The Company recognizes the worldwide challenge for all computer
     ----------                                                                 
systems to recognize the date change for the year 2000 and is assessing its own
computer systems to provide for their continued functionality. This is a high
priority undertaking and crucial to the operation of the Company's business.
The Company does not, however, expect the costs to be material. The Company has
established a budget of approximately $1.0 million to address this issue. It is
anticipated that all costs will be funded with operating income.

     The Company has established a Year 2000 Steering Committee comprised of
members of senior management.  The committee has full responsibility and
authority to establish methodologies and budgets and to allocate necessary
resources.  Under this committee, there is a Year 2000 Project Office that
manages all internal business and staff units, as well as the efforts of outside
consultants.  The office is charged with the responsibility of evaluating (and
remediating, if necessary) critical internal technology systems, whether
internally-developed systems or purchased from vendors.

                                       21
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
CONDITION AND RESULTS OF OPERATIONS (CONTINUED)    


     The Company's year 2000 testing plan incorporates a three phase process
encompassing critical business systems, both internally developed and externally
provided.  The plan is targeted for completion by December 31, 1998.  Phase one,
the Assessment and Impact Analysis phase, which included inventory and code
scanning, is complete.  Phase two, the Testing and Review phase, is currently in
process.  This critical phase involves test case development, year 2000
simulation, transaction testing, business unit validation, and vendor
management.  Phase three is the remediation phase.  Remediation of the Company's
internal systems is not expected to be significant based upon the status of work
performed to date. Remediation to vendor-provided systems is not expected to be
significant, based upon representations received from such vendors.

     A potential exposure to the Company is the failure by any insured issuer,
municipal or non-municipal, to make debt service payments due to an issuer's
systems failure. An issuer's failure to make debt service payments due to year
2000-related systems failures may result in a claim under an Ambac Assurance
insurance policy.  In such event, the Company would utilize its sources of
liquidity to pay claims.  The Company would expect full recovery of such claims
when year 2000 problems are resolved.

     Many of the findings discussed above are preliminary. The Company can make
no assurances at this time regarding the ultimate outcome of the efforts
described herein.  Furthermore, the Company cannot guarantee that the systems of
external entities (such as securities exchanges or funds and securities clearing
organizations) which may impact the Company will be year 2000 compliant.  A
failure to comply by such external entities, could have a material impact on the
operations of the Company.


ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
     In the ordinary course of business, the Company, through its affiliates,
manages a variety of risks, principally market, credit, liquidity, operational
and legal.  These risks are identified, measured and monitored through a variety
of control mechanisms, which are in place at different levels throughout the
organization.

     Market risk generally represents the risk of loss that may result from the
potential change in the fair value of a financial instrument as a result of
changes in prices and interest rates.  The Company has financial instruments
held for purposes other than trading and for trading purposes.  The principal
market risk for the Company's financial instruments held for purposes other than
trading is interest rate risk. An independent risk management group is involved
in setting and monitoring risk limits and the application of risk measurement
methodologies.  The estimation of potential losses arising from adverse changes
in market conditions is a key element in managing market risk. The Company
utilizes various models and  stress test scenarios to monitor and  manage
interest rate risk.  This process includes frequent analyses of both parallel
and non-parallel shifts in the yield curve. These models include estimates made
by management and the valuation results could differ materially from amounts
that would actually be realized in the market.  Financial instruments held for
purposes other than trading which may be adversely affected by changes in
interest rates, consist primarily of investment securities, 

                                       22
<PAGE>
 
QUANTITATIVE AND QUALITATIVE DISCLOSURES 
ABOUT MARKET RISK (CONTINUED)

investment agreement liabilities, debentures, and related derivative contracts
(primarily interest rate swaps and futures) used for hedging purposes.

     The Company, through its affiliate Ambac Financial Services, L.P.
("AFSLP"), is a provider of interest rate swaps to states, municipalities and
their authorities and other entities in connection with their financings. AFSLP
manages its business with the goal of being market neutral to changes in overall
interest rates, while retaining basis risk, the relationship between floating
tax-exempt and floating taxable interest rates.  If actual or projected floating
tax-exempt interest rates change in relation to floating taxable interest rates,
AFSLP will experience an unrealized mark-to-market gain or loss. The AFSLP swap
portfolio is considered held for trading purposes.  Market risk for financial
instruments held for trading purposes relates to the impact of pricing changes
on future earnings. The principal  market risk is basis risk. Since late 1995,
most municipal interest rate swaps transacted contain provisions which are
designed to protect the Company against certain forms of tax reform, thus
mitigating its basis risk.  An independent risk management group monitors
trading risk limits and, together with senior management, is involved in the
application of risk measurement methodologies.

                                       23
<PAGE>
 
PART II - OTHER INFORMATION


     Items 1, 2, 3, and 5 are omitted either because they are inapplicable or
because the answer to such question is negative.


ITEM 4 - SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     The following matters were voted upon at the Annual Meeting of Stockholders
of the Company held on May 13, 1998, and received the votes set forth below:

     Proposal 1. The following directors were elected to serve on the Company's
     ----------                                                                
Board of Directors:
<TABLE>
<CAPTION>
                                                            Number of Votes Cast
                                             -------------------------------------------------
                                                          For                   Withheld
                                             -------------------------------------------------
 
<S>                                            <C>                         <C>
   Phillip B. Lassiter                                         59,622,611              389,010
   Michael A. Callen                                           59,629,006              382,615
   Renso L. Caporali                                           57,258,546            2,753,075
   Richard Dulude                                              59,626,811              384,810
   W. Grant Gregory                                            59,630,481              381,140
   C. Roderick O'Neil                                          59,627,076              384,545
</TABLE>

There were no broker non-votes for this proposal.

     Proposal 2. The proposal to approve the amendment to the Charter to
     ----------                                                         
increase the number of authorized shares of Common Stock to 200 million was
adopted, with 57,721,540 votes in favor, 2,248,883 votes against and 41,198
votes abstaining. There were no broker non-votes for this proposal.
 
     PROPOSAL 3. The proposal to ratify the selection of KPMG Peat Marwick LLP
     ----------                                                               
as independent auditors of the Company and its subsidiaries for 1998 was
adopted, with 59,960,426 votes in favor, 18,903 votes against and 32,291 votes
abstaining. There were no broker non-votes for this proposal.

                                       24
<PAGE>
 
PART II - OTHER INFORMATION (CONTINUED)

ITEM 6 - EXHIBITS AND REPORTS ON FORM 8-K

(A)  THE FOLLOWING ARE ANNEXED AS EXHIBITS:

<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                       Description
- ----------      -----------------------------------------------------------------------
 
<C>         <S>   <C>
      4.04        Conformed Copy of the Certificate of Amendment to the Amended and
                  Restated Certificate of Incorporation of the Company with the
                  Secretary of State of the State of Delaware on May 13, 1998.

     10.22        Conformed Copy of U.S. $150,000,000 Credit Agreement, dated as of
                  August 3, 1998 (the "BNS Credit Agreement") among the Company and
                  Ambac Assurance Corporation as the Borrowers, Certain Commercial
                  Lending Institutions as the Lenders, Citibank, N.A. , as the
                  Documentation Agent, First National Bank of Chicago, as the
                  Co-Agent, and The Bank of Nova Scotia, acting through its New York
                  Agency, as the Arranger and the Administrative Agent.

     27.00        Financial Data Schedule.

     99.03        Ambac Assurance Corporation and Subsidiaries Consolidated Unaudited
                  Financial Statements as of June 30, 1998 and December 31, 1997 and
                  for the periods ended June 30, 1998 and 1997.

(B)    REPORTS ON FORM 8-K:
 
       There were no reports on Form 8-K filed during the second quarter of 1998.
 
</TABLE>
 
____________________________________--
* Management contract or compensatory plan, contract or arrangement required to
be filed as an exhibit pursuant to Item 6(a) of  Form 10-Q.
                                                ---------- 

                                       25
<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.




                                    AMBAC FINANCIAL GROUP, INC.
                                    (REGISTRANT)



DATED:   AUGUST 14, 1998            BY: /S/ FRANK J. BIVONA
                                        -------------------
                                         FRANK J. BIVONA
                                         EXECUTIVE VICE PRESIDENT, CHIEF
                                         FINANCIAL OFFICER AND TREASURER
                                         (PRINCIPAL FINANCIAL AND ACCOUNTING
                                         OFFICER AND DULY AUTHORIZED OFFICER)

                                       26
<PAGE>
 
                                 INDEX TO EXHIBITS

<TABLE>
<CAPTION>

 EXHIBIT
 NUMBER                                      Description
- ----------      ----------------------------------------------------------------------
 
<S>               <C>
4.04              Conformed Copy of the Certificate of Amendment to the Amended and
                  Restated Certificate of Incorporation of the Company with the
                  Secretary of State of the State of Delaware on May 13, 1998.

10.22             Conformed Copy of U.S. $150,000,000 Credit Agreement, dated as of
                  August 3, 1998 (the "BNS Credit Agreement") among the Company and
                  Ambac Assurance Corporation as the Borrowers, Certain Commercial
                  Lending Institutions as the Lenders, Citibank, N.A. , as the
                  Documentation Agent, First National Bank of Chicago, as the
                  Co-Agent, and The Bank of Nova Scotia, acting through its New York
                  Agency, as the Arranger and the Administrative Agent.

27.00             Financial Data Schedule.
 
99.03             Ambac Assurance Corporation and Subsidiaries Consolidated Unaudited
                  Financial Statements as of June 30, 1998 and December 31, 1997 and
                  for the periods ended June 30, 1998 and 1997.
</TABLE>




                                        

                                       27

<PAGE>
 
                                                                    Exhibit 4.04

                            CERTIFICATE OF AMENDMENT

                                     TO THE

               AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                          AMBAC FINANCIAL GROUP, INC.

     Ambac Financial Group, Inc., a Delaware corporation (the "CORPORATION"),
hereby certifies to the Secretary of State of the State of Delaware as follows:

        1. The name of the Corporation is Ambac Financial Group, Inc. and its
Amended and Restated Certificate of Incorporation was filed with the Secretary
of State on July 11, 1997.
 
        2. Section 4.1 of Article IV of the Corporation's Amended and Restated
Certificate of Incorporation is hereby amended in its entirety to read as
follows:

          Section 4.1.  AUTHORIZED CAPITAL.  The total number of shares of all
          classes of stock that the Corporation shall have authority to issue is
          204,000,000, consisting of 200,000,000 shares of common stock, par
          value $.01 per share (the "COMMON STOCK") and 4,000,000 shares of
          preferred stock, par value $.01 per share (the "PREFERRED STOCK").


        3. The foregoing amendment was duly adopted in accordance with the
provisions of Section 242 of the General Corporation Law of the State of
Delaware.
<PAGE>
 
     IN WITNESS WHEREOF, Ambac Financial Group, Inc. has caused this Certificate
to be duly executed on this 13th day of May, 1998 in its corporate name and on
its behalf by the Chairman, President and Chief Executive Officer and attested
by its Secretary, pursuant to Section 103(a) of the General Corporation Law of
the State of Delaware.

                                      /s/ Phillip B. Lassiter
                                      -----------------------
                                      Phillip B. Lassiter
                                      Chairman, President and
                                      Chief Executive Officer

ATTEST: /s/ Richard B. Gross
        --------------------
        Richard B. Gross
        Secretary

Dated:  May 13, 1998

<PAGE>
 
                                                                  Execution Copy
                                                                  --------------


                               U.S. $150,000,000

                               CREDIT AGREEMENT,


                          dated as of August 3, 1998,



                                     among



                          AMBAC FINANCIAL GROUP, INC.



                                      and



                         AMBAC ASSURANCE CORPORATION,



                               as the Borrowers,



                                      and



                   CERTAIN COMMERCIAL LENDING INSTITUTIONS,


                                as the Lenders,



                                CITIBANK, N.A.,

                          as the Documentation Agent,


                      THE FIRST NATIONAL BANK OF CHICAGO,

                               as the Co-Agent,



                                      and



                           THE BANK OF NOVA SCOTIA,
                      acting through its New York Agency,

                 as the Arranger and the Administrative Agent
<PAGE>
 
                               TABLE OF CONTENTS



SECTION                                                         PAGE
                                                                ----


                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS

1.1.    Defined Terms..........................................  1
1.2.    Use of Defined Terms................................... 11
1.3.    Cross-References....................................... 11
1.4.    Accounting and Financial Determinations................ 12



                                  ARTICLE II

                  COMMITMENTS, BORROWING PROCEDURES AND NOTES

2.1.    Commitments............................................ 12
2.1.1.  Commitment of Each Lender.............................. 12
2.1.2.  Lenders Not Permitted or Required To Make Loans........ 12
2.2.    Optional Reduction of Commitment Amount................ 13
2.3.    Borrowing Procedure.................................... 13
2.4.    Continuation and Conversion Elections.................. 13
2.5.    Funding................................................ 14
2.6.    Notes.................................................. 14
2.7.    Extension of Scheduled Commitment Termination Date..... 14
2.7.1.  Request for Extension.................................. 14
2.7.2.  Effectiveness of Extension............................. 15


                                  ARTICLE III

                  REPAYMENTS, PREPAYMENTS, INTEREST AND FEES


3.1.    Repayments and Prepayments............................. 16
3.2.    Interest Provisions.................................... 17
3.2.1.  Rates.................................................. 17
3.2.2.  Post-Maturity Rates.................................... 18
3.2.3.  Payment Dates.......................................... 18
3.3.    Fees................................................... 19
3.3.1.  Facility Fee........................................... 19
3.3.2.  Administration Fee..................................... 19

                                      -i-
<PAGE>
 
                                  ARTICLE IV

                    CERTAIN, LIBO RATE AND OTHER PROVISIONS



4.1.    LIBO Rate Lending Unlawful..............................19
4.2.    Deposits Unavailable....................................19
4.3.    Increased LIBO Rate Loan Costs, etc.....................20
4.4.    Funding Losses..........................................20
4.5.    Increased Capital Costs.................................21
4.6.    Taxes...................................................21
4.7.    Payments, Computations, etc.............................22
4.8.    Sharing of Payments.....................................23
4.9.    Setoff..................................................24
4.10.   Use of Proceeds.........................................24

                                   ARTICLE V

                  CONDITIONS TO CLOSING DATE AND TO BORROWING

5.1.    Closing Date............................................24
5.1.1.  Resolutions, etc........................................24
5.1.2.  Delivery of Notes.......................................25
5.1.3.  Opinions of Counsel.....................................25
5.1.4.  Closing Fees, Expenses, etc.............................25
5.1.5.  Notification............................................25
5.2.    All Borrowings..........................................25
5.2.1.  Compliance with Warranties, No Default, etc.............25
5.2.2.  Borrowing Request.......................................26
5.2.3.  Satisfactory Legal Form.................................26


                                  ARTICLE VI

                        REPRESENTATIONS AND WARRANTIES

6.1.   Organization, etc........................................26
6.2.   Due Authorization, Non-Contravention, etc................27
6.3.   Government Approval, Regulation, etc.....................27
6.4.   Validity, etc............................................27
6.5.   Financial Information....................................27
6.6.   No Material Adverse Change...............................27
6.7.   Litigation, Labor Controversies, etc.....................27
6.8.   Taxes....................................................28
6.9.   Pension and Welfare Plans................................28
6.10.  Regulation U.............................................28
6.11.  Accuracy of Information..................................29
6.12.  Year 2000................................................29

                                      -ii-
<PAGE>
 
                                  ARTICLE VII

                                   COVENANTS

7.1.    Affirmative Covenants...................................29
7.1.1.  Financial Information, Reports, Notices, etc............29
7.1.2.  Compliance with Laws, etc...............................31
7.1.3.  Maintenance of Properties...............................31
7.1.4.  Insurance...............................................31
7.1.5.  Books and Records.......................................32
7.2.    Negative Covenants......................................32
7.2.1.  Liens...................................................32
7.2.2.  Consolidation, Merger, etc..............................32
7.2.3.  Asset Dispositions, etc.................................33
7.2.4.  Certain Restrictive Agreements, etc.....................33
7.2.5.  Leverage Ratio..........................................34


                                 ARTICLE VIII

                               EVENTS OF DEFAULT

8.1.    Listing of Events of Default............................34
8.1.1.  Non-Payment of Obligations..............................34
8.1.2.  Breach of Warranty......................................34
8.1.3.  Non-Performance of Certain Covenants and
        Obligations.............................................34
8.1.4.  Non-Performance of Other Covenants and Obligations......35
8.1.5.  Default on Other Indebtedness...........................35
8.1.6.  Judgments...............................................35
8.1.7.  Pension Plans...........................................36
8.1.8.  Rating..................................................36
8.1.9.  Bankruptcy, Insolvency, etc.............................36
8.2.    Action if Bankruptcy....................................36
8.3.    Action if Other Event of Default........................37


                                  ARTICLE IX

                                  THE AGENTS

9.1.    Actions.................................................37
9.2.    Funding Reliance, etc...................................38
9.3.    Exculpation.............................................38
9.4.    Successor...............................................39
9.5.    Loans by an Agent.......................................39
9.6.    Credit Decisions........................................40
9.7.    Copies, etc.............................................40

                                     -iii-
<PAGE>
 
                                   ARTICLE X

                           MISCELLANEOUS PROVISIONS

10.1.      Waivers, Amendments, etc........................        40   
10.2.      Notices.........................................        41   
10.3.      Payment of Costs and Expenses...................        41   
10.4.      Indemnification.................................        42   
10.5.      Survival........................................        42   
10.6.      Severability....................................        42   
10.7.      Headings........................................        43   
10.8.      Execution in Counterparts, Effectiveness, etc...        43   
10.9.      Governing Law; Entire Agreement..............           43
10.10.     Successors and Assigns.......................           43
10.11.     Assignments; Participations..................           43
10.11.1.   Assignments..................................           43
10.11.2.   Participations...............................           45
10.11.3.   Confidential Information.....................           45
10.11.4.   Federal Reserve Bank Advances................           45
10.12.     Other Transactions...........................           46
10.13.     Forum Selection and Consent to Jurisdiction..           46
10.14.     Waiver of Jury Trial.........................           46
 

SCHEDULE I  -  Disclosure Schedule

EXHIBIT A   -  Form of Note
EXHIBIT B   -  Form of Borrowing Request
EXHIBIT C   -  Form of Continuation/Conversion Notice
EXHIBIT D   -  Form of Lender Assignment Agreement
EXHIBIT E-1 -  Form of Opinion of Shearman & Sterling
EXHIBIT E-2 -  Form of Opinion of Anne G. Gill, Vice President, 
               Counsel and Assistant Secretary to Ambac 
               Financial Group, Inc.
EXHIBIT E-3 -  Form of Opinion of Anne G. Gill, Vice President, 
               Assistant General Counsel and Assistant Secretary
               to Ambac Assurance Corporation
EXHIBIT E-4 -  Form of Opinion of DeWitt Ross & Stevens, S.C., 
               special Wisconsin counsel to Ambac Assurance
               Corporation
EXHIBIT F   -  Form of Opinion of Mayer, Brown & Platt, Counsel 
               to the Administrative Agent
EXHIBIT G    - Form of Compliance Certificate

                                      -iv-
<PAGE>
 
                               CREDIT AGREEMENT



     THIS CREDIT AGREEMENT, dated as of August 3, 1998, among AMBAC FINANCIAL
GROUP, INC. ("Ambac Financial"), AMBAC ASSURANCE CORPORATION ("Ambac Assurance";
              ---------------                                  ---------------  
together with Ambac Financial, the "Borrowers"), the various commercial lending
                                    ---------                                  
institutions as are or may become parties (hereto collectively, the "Lenders"),
                                                                     -------   
CITIBANK, N.A. ("Citibank"), as documentation agent (the "Documentation Agent"),
                 --------                                 -------------------   
THE FIRST NATIONAL BANK OF CHICAGO ("FNBC"), as co-agent (the "Co-Agent"), and
                                     ----                      --------       
THE BANK OF NOVA SCOTIA ("BNS"), acting through its New York Agency, as arranger
                          ---                                                   
and administrative agent (the "Administrative Agent") for the Lenders.
                               --------------------                   



                                 W I T N E S S E T H:

     WHEREAS, the Borrowers desire to obtain Commitments from the Lenders
pursuant to which Loans will be made to the Borrowers from time to time prior to
the applicable Commitment Termination Date for such Commitments; and

     WHEREAS, the Lenders are willing, on the terms and subject to the
conditions hereinafter set forth (including Article V), to extend such
                                            ---------                 
Commitments and make such Loans to the Borrowers;

     NOW, THEREFORE, in consideration of the premises and promises hereinafter
set forth and intending to be legally bound hereby, the parties hereto agree as
follows:


                                 ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS
 
     SECTION I.1.  Defined Terms.  The following terms (whether or not 
                   -------------
underscored) when used in this Agreement, including its preamble and recitals,
shall, except where the context otherwise requires, have the following meanings
(such meanings to be equally applicable to the singular and plural forms
thereof):

     "Administrative Agent" is defined in the preamble and includes each other
      --------------------                    --------                        
successor Administrative Agent appointed pursuant to Section 9.4.
                                                     ----------- 

     "Agent" means, as the context may require, the Arranger, the Documentation
      -----                                                                    
Agent, the Co-Agent or the Administrative Agent.
<PAGE>
 
     "Agreement" means this Credit Agreement as from time to time
      ---------                                                   
amended, supplemented, amended and restated, or otherwise modified.


     "Alternate Base Rate" means, on any date, a rate of interest per annum
      -------------------                                                  
equal to the higher of:  (a) the rate of interest most recently announced by
BNS, New York Agency, as its base rate for Dollar loans; and (b) the Federal
Funds Rate most recently determined by the Administrative Agent plus  1/2 of 1%
per annum.  The Alternate Base Rate is not necessarily intended to be the lowest
rate of interest determined by BNS in connection with extensions of credit.
Changes in the rate of interest on that portion of any Loans maintained as Base
Rate Loans will take effect simultaneously with each change in the Alternate
Base Rate.  The Administrative Agent will give notice promptly to the Borrowers
and the Lenders of changes in the Alternate Base Rate.


     "Ambac Assurance" is defined in the preamble.
      ---------------                    -------- 

     "Ambac Financial" is defined in the preamble.
      ---------------                    -------- 

     "Arranger" is defined in the preamble.
      --------                    -------- 

     "Asset Disposition" is defined in Section 7.2.3.
      -----------------                ------------- 

     "Assignee Lender" is defined in Section 10.11.1.
      ---------------                --------------- 


     "Authorized Officer" means, relative to either Borrower, those of its
      ------------------                                                  
officers whose signatures and incumbency shall have been certified to the
Administrative Agent and the Lenders pursuant to Section 5.1.1.
                                                 ------------- 

     "Base Rate Loan" means a Loan bearing interest at a fluctuating rate
      --------------                                                     
determined by reference to the Alternate Base Rate.


     "BNS" is defined in the preamble.
      ---                    -------- 

     "Borrowers" is defined in the preamble.
      ---------                    -------- 

     "Borrowing" means the Loans of the same type and, in the case of LIBO Rate
      ---------                                                                
Loans, having the same Interest Period made by all Lenders on the same Business
Day to the applicable Borrower and pursuant to the same Borrowing Request in
accordance with Section 2.1.
                ----------- 

     "Borrowing Request" means a loan request and certificate duly executed by
      -----------------                                                       
an Authorized Officer of either Borrower, substantially in the form of Exhibit B
                                                                       ---------
hereto.

                                      -2-
<PAGE>
 
     "Business Day" means: (a) any day which is neither a Saturday or Sunday nor
      ------------                                                              
a legal holiday on which banks are authorized or required to be closed in New
York, New York; and (b) relative to the making, continuing, prepaying or
repaying of any LIBO Rate Loans, any day on which dealings in Dollars are
carried on in the London interbank market.

     "CLHI" means Connie Lee Holdings, Inc., a wholly-owned subsidiary of Ambac
      ----                                                                     
Assurance.


     "Closing Date" means the date on or after the Effective Date on which the
      ------------                                                            
Administrative Agent shall have received the documents specified in or pursuant
to Section 5.1.
   ----------- 

     "Co-Agent" is defined in the preamble.
      --------                    -------- 

     "Code" means the Internal Revenue Code of 1986, as amended, reformed or
      ----                                                                  
otherwise modified from time to time.


     "Commitment" is defined in Section 2.1.1.
      ----------                ------------- 

     "Commitment Amount" means $150,000,000, as such amount may be reduced from
      -----------------                                                        
time to time pursuant to Section 2.2 or 2.7.
                         -----------    --- 

     "Commitment Termination Date" means the earliest of: (a) the Scheduled
      ---------------------------                                          
Commitment Termination Date; (b) the date on which the Commitment Amount is
terminated in full or reduced to zero pursuant to Section 2.2; and (c) the date
                                                  -----------                  
on which any Commitment Termination Event occurs.  Upon the occurrence of any
event described in clause (b) or (c), the Commitments shall terminate
                   ----------    ---                                 
automatically and without further action.

     "Commitment Termination Event" means (a) the occurrence of any Default
      ----------------------------                                         
described in Section 8.2, with respect to either Borrower; or (b) the occurrence
             -----------                                                        
and continuance of any other Event of Default and either (i) the declaration of
the Loans to be due and payable pursuant to Section 8.3, or (ii) in the absence
                                            -----------                        
of such declaration, the giving of notice by the Administrative Agent, acting at
the direction of the Required Lenders, to the Borrowers that the Commitments
have been terminated.

     "Compliance Certificate" means a certificate, substantially in the form of
      ----------------------                                                   
Exhibit G.
- --------- 

     "Connie Lee" means Connie Lee Insurance Company, a wholly-owned subsidiary
      ----------                                                               
of CLHI.


     "Consenting Lenders" is defined in Section 2.7.2.
      ------------------                ------------- 

                                      -3-
<PAGE>
 
     "Contingent Liability" means any agreement, undertaking or arrangement by
      --------------------                                                    
which any Person guarantees, endorses or otherwise becomes or is contingently
liable upon (by direct or indirect agreement, contingent or otherwise, to
provide funds for payment, to supply funds to, or otherwise to invest in, a
debtor, or otherwise to assure a creditor against loss) the Indebtedness of any
other Person (other than by endorsements of instruments in the course of
collection), or guarantees the payment of dividends or other distributions upon
the shares of any other Person. The amount of any Person's obligation under any
Contingent Liability at any time shall (subject to any limitation set forth
therein) be deemed to be the outstanding amount at such time (or, except in the
case of the Indebtedness or obligation guaranteed thereby being unutilized
credit lines for Derivative Transactions, if larger, the maximum amount) of the
Indebtedness or obligation guaranteed thereby.

     "Continuation/Conversion Notice" means a notice of continuation or
      ------------------------------                                   
conversion and certificate duly executed by an Authorized Officer of either
Borrower, substantially in the form of Exhibit C hereto.
                                       ---------        

     "Controlled Group" means all members of a controlled group of corporations
      ----------------                                                         
and all members of a controlled group of trades or businesses (whether or not
incorporated) under common control which, together with either Borrower, are
treated as a single employer under Section 414(b) or 414(c) of the Code or
Section 4001 of ERISA.

     "Debt" of any Person means, without duplication, all Indebtedness (other
      ----                                                                   
than Indebtedness under the Loss Facility) of such Person of any type described
in clauses (a), (b) or (c) of the definition of "Indebtedness" and all
Contingent Liabilities of such Person in respect of any such Indebtedness of any
other Person.

     "Default" means any Event of Default or any condition, occurrence or event
      -------                                                                  
which, after notice or lapse of time or both, would constitute an Event of
Default.

     "Derivative Transactions" means, with respect to any Person, interest rate
      -----------------------                                                  
swap agreements, interest rate cap agreements, interest rate collar agreements,
interest rate options, interest rate futures, foreign currency swap agreements,
foreign currency cap agreements, foreign currency collar agreements, foreign
currency options, foreign currency futures and all other similar agreements or
arrangements and all liabilities of such Person thereunder.

     "Disclosure Schedule" means the Disclosure Schedule attached hereto as
      -------------------                                                  
Schedule I, as it may be amended, supplemented or 
- ----------                                                                    

                                      -4-
<PAGE>
 
otherwise modified from time to time by the Borrowers with the written consent
of the Administrative Agent and the Required Lenders.

     "Documentation Agent" is defined in the preamble.
      -------------------                    -------- 

     "Dollar" and the sign "$" mean lawful money of the United States.
      ------                -                                         

     "Domestic Office" means, relative to any Lender, the office of such Lender
      ---------------                                                          
designated as such below its signature hereto or designated in the Lender
Assignment Agreement or such other office of a Lender (or any successor or
assign of such Lender) within the United States as may be designated from time
to time by notice from such Lender, as the case may be, to each other Person
party hereto.

     "Effective Date" means August 3, 1998.
      --------------                       

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
      -----                                                               
amended, and any successor statute of similar import, together with the
regulations thereunder, in each case as in effect from time to time.  References
to sections of ERISA also refer to any successor sections.

     "Event of Default" is defined in Section 8.1.
      ----------------                ----------- 

     "Extension Date" is defined in Section 2.7.1.
      --------------                ------------- 

     "Federal Funds Rate" means, for any period, a fluctuating interest rate per
      ------------------                                                        
annum equal for each day during such period to: (a) the weighted average of the
rates on overnight federal funds transactions with members of the Federal
Reserve System arranged by federal funds brokers, as published for such day (or,
if such day is not a Business Day, for the next preceding Business Day) by the
Federal Reserve Bank of New York; or (b) if such rate is not so published for
any day which is a Business Day, the average of the quotations for such day on
such transactions received by BNS from three federal funds brokers of recognized
standing selected by it.

     "Fiscal Quarter" means any quarter of a Fiscal Year.
      --------------                                     

     "Fiscal Year" means any period of twelve consecutive calendar months ending
      -----------                                                               
on December 31; references to a Fiscal Year with a number corresponding to any
calendar year (e.g., the "1997 Fiscal Year") refer to the Fiscal Year ending on
               ----                                                            
the December 31 occurring during such calendar year.

     "FNBC" is defined in the preamble.
      ----                    -------- 

                                      -5-
<PAGE>
 
     "F.R.S. Board" means the Board of Governors of the Federal Reserve System
      ------------                                                            
or any successor thereto.

     "GAAP" is defined in Section 1.4.
      ----                ----------- 

     "herein", "hereof", "hereto", "hereunder" and similar terms contained in
      ------    ------    ------    ---------                                
this Agreement or any other Loan Document refer to this Agreement or such other
Loan Document, as the case may be, as a whole and not to any particular Section,
paragraph or provision of this Agreement or such other Loan Document.

     "Impermissible Qualification" means, relative to the opinion or
      ---------------------------                                   
certification of any independent public accountant as to any financial statement
of either Borrower, any qualification or exception to such opinion or
certification which is of a "going concern" or similar nature.

     "including" means including without limitation.
      ---------                                     

     "Indebtedness" of any Person means, without duplication: (a) all
      ------------                                                   
obligations of such Person for borrowed money and all obligations of such Person
evidenced by bonds, debentures, notes or other similar instruments; (b) all
obligations, contingent or otherwise, relative to the face amount of all letters
of credit, whether or not drawn, and banker's acceptances issued for the account
of such Person; (c) all obligations of such Person as lessee under leases which
have been or should be, in accordance with GAAP, recorded as capitalized lease
liabilities; (d) net obligations of such Person under all Derivative
Transactions (other than Derivative Transactions that are designated by such
Person as hedges in accordance with GAAP); (e) whether or not so included as
liabilities in accordance with GAAP, all obligations of such Person to pay the
deferred purchase price of property or services, and indebtedness (excluding
prepaid interest thereon) secured by a Lien on property owned or being purchased
by such Person (including indebtedness arising under conditional sales or other
title retention agreements), whether or not such indebtedness shall have been
assumed by such Person or is limited in recourse; and (f) all Contingent
Liabilities of such Person; provided, however, that the following shall not
                            --------  -------                              
constitute Indebtedness of either Borrower or any Subsidiary of either Borrower:
(i) obligations under securities reverse repurchase agreements of either
Borrower or any Subsidiary of either Borrower as the buyer of securities to
deliver such securities to the seller thereunder, (ii) obligations of an
insurance company under insurance policies in the nature of financial guarantees
and financial guarantees, in each case from time to time issued in the ordinary
course of such insurance company's business, (iii) obligations of any Subsidiary
of Ambac Financial in the business of issuing investment contracts, under
Specified Investment Contracts issued by such Subsidiary, and (iv) 

                                      -6-
<PAGE>
 
obligations of such Person under any Specified Swaps and Specified Hedges. For
all purposes of this Agreement, the Indebtedness of any Person shall include the
Indebtedness of any partnership in which such Person is a general partner.

     "Indemnified Liabilities" is defined in Section 10.4.
      -----------------------                ------------ 

     "Indemnified Parties" is defined in Section 10.4.
      -------------------                ------------ 

     "Interest Period" means, relative to any LIBO Rate Loan, the period
      ---------------                                                   
beginning on (and including) the date on which such LIBO Rate Loan is made or
continued as, or converted into, a LIBO Rate Loan pursuant to Section 2.3 or 2.4
                                                              -----------    ---
and shall end on (but exclude) the day which numerically corresponds to such
date one, two or three months thereafter (or, if such month has no numerically
corresponding day, on the last Business Day of such month), as the applicable
Borrower may select in its relevant notice pursuant to Section 2.3 or 2.4;
                                                       -----------    --- 
provided, however, that (a) neither Borrower shall be permitted to select
- --------  -------                                                        
Interest Periods to be in effect at any one time which have expiration dates
occurring on more than five different dates; (b) Interest Periods commencing on
the same date for Loans comprising part of the same Borrowing shall be of the
same duration; (c) if such Interest Period would otherwise end on a day which is
not a Business Day, such Interest Period shall end on the next following
Business Day (unless, if such Interest Period applies to LIBO Rate Loans, such
next following Business Day is the first Business Day of a calendar month, in
which case such Interest Period shall end on the Business Day next preceding
such numerically corresponding day); and (d) no Interest Period may end later
than the Stated Maturity Date.

     "Lender Assignment Agreement" means a Lender Assignment Agreement
      ---------------------------                                     
substantially in the form of Exhibit D hereto.
                             ---------        

     "Lenders" is defined in the preamble.
      -------                    -------- 

     "Leverage Ratio" means, at any time, the ratio of (a) the aggregate amount
      --------------                                                           
of Debt of Ambac Financial and its Subsidiaries, on a consolidated basis, at
such time to (b) the sum of (i) the stockholders' equity of Ambac Financial and
its Subsidiaries, on a consolidated basis (excluding unrealized gains on
investments and unrealized losses on investments), computed as of the end of the
most recently completed Fiscal Quarter (or if such time is the last day of any
Fiscal Quarter, as of such day) and (ii) the aggregate amount of Debt of Ambac
Financial and its Subsidiaries, on a consolidated basis, at such time.

    "LIBO Rate" is defined in Section 3.2.1.
     ---------                ------------- 

                                      -7-
<PAGE>
 
    "LIBO Rate Loan" means a Loan bearing interest, at all times during an
     --------------                                                       
Interest Period applicable to such Loan, at a fixed rate of interest determined
by reference to the LIBO Rate (Reserve Adjusted).

    "LIBO Rate (Reserve Adjusted)" is defined in Section 3.2.1.
     ----------------------------                ------------- 

    "LIBOR Office" means, relative to any Lender, the office of such Lender
     ------------                                                          
designated as such below its signature hereto or designated in the Lender
Assignment Agreement or such other office of a Lender as designated from time to
time by notice from such Lender to the Borrowers and the Administrative Agent,
whether or not outside the United States, which shall be making or maintaining
LIBO Rate Loans of such Lender hereunder.

    "LIBOR Reserve Percentage" is defined in Section 3.2.1.
     ------------------------                ------------- 

    "Lien" means any security interest, mortgage, pledge, hypothecation,
     ----                                                               
assignment, encumbrance, lien (statutory or otherwise), charge against or
interest in property to secure payment of a debt or performance of an
obligation, interest of any vendor or lessor under any conditional sale
agreement, capital lease or other title retention agreement or other priority or
preferential arrangement of any kind or nature whatsoever; provided, however,
                                                           --------  ------- 
that "Lien" shall not include (i) any reserve established in respect of
insurance obligations on the books of either Borrower or any of its Subsidiaries
provided that such reserve shall not create any preferential claim or priority
on any asset of such Person and (ii) any reserve established in respect of
Specified Swaps on the books of either Borrower or any of its Subsidiaries
provided that such reserve shall not create any preferential claim or priority
on any asset of such Person.

    "Loans" is defined in Section 2.1.1.
     -----                ------------- 

    "Loan Documents" means this Agreement and the Notes.
     --------------                                     

    "Loss Facility" means (i) the Credit Agreement dated as of December 2, 1993
     -------------                                                             
among Ambac Assurance, various banks and Deutsche Bank AG, New York Branch, as
agent therefor, as amended or otherwise modified from time to time, (ii) the
Credit Agreement, dated as of October 24,1994, among Connie Lee, various banks
and Westdeutsche Landesbank Girozentrale, New York Branch, as agent therefor, as
amended or otherwise modified from time to time, or (iii) any similar credit
facility as to which Ambac Assurance or Connie Lee is a borrower, a copy of
which has been provided to the Administrative Agent.

    "Material Adverse Effect" means any material adverse effect on (a) the
     -----------------------                                              
consolidated financial condition, operations, or 

                                      -8-
<PAGE>
 
business of either Borrower and its Subsidiaries, taken as a whole or (b) the
ability of either Borrower to perform any of its obligations under any Loan
Document.

    "Material Subsidiary" means, at any date of determination, any Subsidiary
     -------------------                                                     
that, together with its Subsidiaries, as of the end of the most recent Fiscal
Year, was the owner of (or, in the case of any Subsidiary that is acquired
following such Fiscal Year end, would have been the owner of) at least 10% of
the consolidated assets of the Borrower and its Subsidiaries at the end of such
Fiscal Year, all as set forth on the most recently available consolidated
financial statements of the Borrower for such Fiscal Year.

    "Monthly Payment Date" means the last day of each calendar month or, if any
     --------------------                                                      
such day is not a Business Day, the next succeeding Business Day.

    "Moody's" means Moody's Investors Service, Inc.
     -------                                       

    "Non-Consenting Lender" is defined in Section 2.7.2.
     ---------------------                ------------- 

    "Note" means a promissory note of either Borrower payable to any Lender,
     ----                                                                   
substantially in the form of Exhibit A hereto (as such promissory note may be
                             ---------                                       
amended, endorsed or otherwise modified from time to time), and also means all
other promissory notes accepted from time to time in substitution therefor or
renewal thereof.

    "Obligations" means all obligations (monetary or otherwise) of either or
     -----------                                                            
both Borrowers arising under or in connection with any Loan Document.

    "Organic Document" means, relative to either Borrower, its certificate of
     ----------------                                                        
incorporation, its by-laws and all shareholder agreements, voting trusts and
similar arrangements applicable to any of its authorized shares of capital
stock.

    "Participant" is defined in Section 10.11.2.
     -----------                --------------- 

    "PBGC" means the Pension Benefit Guaranty Corporation and any entity
     ----                                                               
succeeding to any or all of its functions under ERISA.

    "Pension Plan" means a "pension plan", as such term is defined in Section
     ------------                                                            
3(2) of ERISA, which is subject to Title 4 of ERISA (other than a multiemployer
plan as defined in section 4001(a)(3) of ERISA), and to which either Borrower or
any corporation, trade or business that is, along with such Borrower, a member
of a Controlled Group, may have liability, including any liability by reason of
having been a substantial employer within the meaning of section 4063 of ERISA
at any time during the 

                                      -9-
<PAGE>
 
preceding five years, or by reason of being deemed to be a contributing sponsor
under section 4069 of ERISA.

    "Percentage" means, relative to any Lender, the percentage
     ----------                                                
set forth opposite its signature hereto or set forth in the Lender Assignment
Agreement, as such percentage may be adjusted from time to time pursuant to
                                                                           
Section 2.7 and Lender Assignment Agreement(s) executed by such Lender and its
- -----------                                                                   
Assignee Lender(s) and delivered pursuant to Section 10.11.
                                             ------------- 

    "Permitted Noteholder" means (i) any Lender or (ii) any Federal Reserve Bank
     --------------------                                                       
to whom any Lender has pledged any Loan to either Borrower made or held by such
Lender or any Note of either Borrower payable to the order of such Lender and
which Federal Reserve Bank has exercised its rights to notify such Borrower to
make payment under such Loan or Note to such Federal Reserve Bank or has
substituted itself for the Lender under such Note in either event as a result of
a default by such Lender in the observance or performance of any obligation
owing to such Federal Reserve Bank which is secured by such Loan or Note.

    "Person" means any natural person, corporation, partnership, firm,
     ------                                                           
association, trust, government, governmental agency or any other entity, whether
acting in an individual, fiduciary or other capacity.

    "Quarterly Payment Date" means the last day of each March, June, September,
     ----------------------                                                    
and December or, if any such day is not a Business Day, the next succeeding
Business Day.

    "Required Lenders" means, at any time, Lenders holding at least 51.0% of the
     ----------------                                                           
then aggregate outstanding principal amount of the Notes then held by the
Lenders, or, if no such principal amount is then outstanding, Lenders having at
least 51.0% of the Commitments.

    "SEC" means the Securities and Exchange Commission.
     ---                                               

    "S&P" means Standard and Poor's Corporation.
     ---                                        

    "Scheduled Commitment Termination Date" means with respect to any Lender,
     -------------------------------------                                   
(a) initially, August 3, 1999, or (b) as it may be extended from time to time in
accordance with Section 2.7 with respect to such Lender, the applicable
                -----------                                            
Extension Date.

    "Specified Swap" means any interest rate swap agreement or other similar
     --------------                                                         
agreement or 

                                      -10-
<PAGE>
 
arrangement entered into by any Person, as to which interest rate risk is
substantially hedged.

    "Specified Hedge" means any derivative transaction, securities repurchase
     ---------------                                                         
agreement or other similar agreement or arrangement entered into by any Person
that, in each case, is entered into as a hedge.

    "Specified Investment Contract" means any investment contract
     -----------------------------                                
entered into by Ambac Assurance or any Subsidiary of Ambac Financial, in the
ordinary course of Ambac Assurance's or such Subsidiary's respective businesses.

    "Stated Maturity Date" means with respect to each Loan, the date that is
     --------------------                                                   
exactly two years following the Scheduled Commitment Termination Date; provided;
                                                                       -------- 
however, that if such day is not a Business Day, the Stated Maturity Date shall
- -------                                                                        
be the immediately preceding Business Day; and further provided that, subject to
                                               ------- --------                 
the first sentence of Section 2.7.2(c), the Stated Maturity Date with respect to
                      ----------------                                          
each Loan of a Non-Consenting Lender shall be its applicable Scheduled
Commitment Termination Date pursuant to Section 2.7.2(c).
                                        ---------------- 

    "Subsidiary" means, with respect to any Person, (i) any corporation of which
     ----------                                                                 
more than 50% of the outstanding capital stock having ordinary voting power to
elect a majority of the board of directors of such corporation (irrespective of
whether at the time capital stock of any other class or classes of such
corporation shall or might have voting power upon the occurrence of any
contingency) is at the time directly or indirectly owned by such Person, by such
Person and one or more other Subsidiaries of such Person, or by one or more
other Subsidiaries of such Person or (ii) any partnership or other business
entity as to which such Person and/or one or more Subsidiaries of such Person
singly, or in the aggregate, (A) own more than 50% of the equity or more than
50% of the ordinary voting power or more than 50% of the general partnership
interests, of such partnership or business entity or (B) have the presently
exercisable right to direct or cause the direction of management and policies of
such partnership or other business entity.

    "Taxes" is defined in Section 4.6.
     -----                ----------- 

    "type" means, relative to any Loan, the portion thereof, if any, being
     ----                                                                 
maintained as a Base Rate Loan or a LIBO Rate Loan.

    "United States" or "U.S." means the United States of America, its fifty
     -------------      ----                                               
States and the District of Columbia.

    "Welfare Plan" means a "welfare plan", as such term is defined in section
     ------------                                                            
3(1) of ERISA.

    SECTION 1.2.  Use of Defined Terms.  Unless otherwise defined or 
                  --------------------
the context otherwise requires, terms for which meanings are provided in this
Agreement shall have such meanings when used in the Disclosure Schedule and in
each Note, Borrowing Request,

                                      -11-
<PAGE>
 
Continuation/Conversion Notice, Loan Document, notice and other communication
delivered from time to time in connection with this Agreement or any other Loan
Document.

    SECTION 1.3.  Cross-References.  Unless otherwise specified, references 
                  ----------------
in this Agreement and in each other Loan Document to any Article or Section are
references to such Article or Section of this Agreement or such other Loan
Document, as the case may be, and, unless otherwise specified, references in any
Article, Section or definition to any clause are references to such clause of
such Article, Section or definition.

    SECTION 1.4.  Accounting and Financial Determinations.  Unless otherwise 
                  ---------------------------------------
specified, all accounting terms used herein or in any other Loan Document shall
be interpreted, all accounting determinations and computations hereunder or
thereunder and all financial statements required to be delivered hereunder or
thereunder shall be prepared in accordance with, those generally accepted
accounting principles in effect from time to time ("GAAP").


                                 ARTICLE II

                  COMMITMENTS, BORROWING PROCEDURES AND NOTES
 
    SECTION 2.1. Commitments . On the terms and subject to the conditions of
                 -----------
this Agreement (including Article V), each Lender severally agrees to make 
                          --------- 
Loans pursuant to the Commitments described in this Section 2.1.
                                                    ----------- 

    SECTION 2.1.1. Commitment of Each Lender . From time to time on any Business
                   -------------------------
Day occurring prior to the Commitment Termination Date, each Lender will make
loans (relative to such Lender, and of any type, its "Loans") to the Borrower
                                                      -----
that has requested such loans, equal to such Lender's Percentage of the
aggregate amount of the Borrowing requested by such Borrower to be made on such
day. The commitment of each Lender described in this Section 2.1.1 is herein
         ----------                                  ------------- 
referred to as its "Commitment". On the terms and subject to the conditions
hereof, either Borrower may from time to time borrow, prepay and reborrow Loans.


    SECTION 2.1.2.  Lenders Not Permitted or Required To Make Loans.  No Lender 
                     -----------------------------------------------
shall be permitted or required to make any Loan if, after giving effect thereto,
the aggregate outstanding principal amount of all Loans to the Borrowers would
exceed the Commitment Amount, or the aggregate principal amount of all Loans to
the Borrowers of such Lender would exceed such Lender's Percentage of the
Commitment Amount. The amount of each Lender's Percentage of the Commitment
Amount on the date hereof is set forth below:

                                      -12-
<PAGE>
 
     The Bank of Nova Scotia    $50,000,000

     Citibank, N.A.             $50,000,000

     The First National Bank
        of Chicago              $50,000,000


    SECTION 2.2.  Optional Reduction of Commitment Amount.  The Borrowers 
                  ---------------------------------------
may, from time to time on any Business Day, voluntarily reduce the Commitment 
Amount; provided, however, that all such reductions shall require at least 
        --------  -------                                
three Business Days' prior notice to the Administrative Agent and be permanent,
and any partial reduction of the Commitment Amount shall be in a minimum amount
of $1,000,000 and in an integral multiple of $1,000,000.

    SECTION 2.3.  Borrowing Procedure.  By delivering a Borrowing Request to 
                  -------------------
the Administrative Agent on or before 10:00 a.m., New York City time, on a
Business Day, either Borrower may from time to time irrevocably request, on not
less than three nor more than five Business Days' notice (or in the case of Base
Rate Loans being requested, on the Business Day on which such Loans are to be
made) that a Borrowing be made in a minimum amount of $1,000,000 and an integral
multiple of $1,000,000, or in the unused amount of the Commitments. On the terms
and subject to the conditions of this Agreement, each Borrowing shall be
comprised of the same type of Loans, and shall be made on the Business Day,
specified in such Borrowing Request. On or before 12:00 noon (New York City
time) on such Business Day each Lender shall deposit with the Administrative
Agent same day funds in an amount equal to such Lender's Percentage of the
requested Borrowing. Such deposit will be made to an account which the
Administrative Agent shall specify from time to time by notice to the Lenders.
To the extent funds are received from the Lenders, the Administrative Agent
shall make such funds available to such Borrower no later than 1:00 p.m. (New
York City time) on the Business Day specified in the relevant Borrowing Request,
by wire transfer to the accounts such Borrower shall have specified in its
Borrowing Request. No Lender's obligation to make any Loan shall be affected by
any other Lender's failure to make any Loan.

    SECTION 2.4.  Continuation and Conversion Elections.  By delivering a
                  -------------------------------------
Continuation/Conversion Notice to the Administrative Agent on or before 10:00
a.m., New York City time, on a Business Day, the applicable Borrower may from
time to time irrevocably elect, on not less than three nor more than five
Business Days' notice (or to the extent Loans are being converted into Base Rate
Loans, on the Business Day on which such conversion is to be made) that all, or
any portion in an aggregate minimum amount of $1,000,000 and an integral
multiple of $1,000,000, of any Loans to such Borrower be, in the case of Base
Rate Loans to such 

                                      -13-
<PAGE>
 
Borrower, converted into LIBO Rate Loans or, in the case of LIBO Rate Loans to
such Borrower, be converted into a Base Rate Loan or continued as a LIBO Rate
Loan (in the absence of delivery of a Continuation/Conversion Notice with
respect to any LIBO Rate Loan at least three Business Days before the last day
of the then current Interest Period with respect thereto, such LIBO Rate 
Loan shall, on such last day, automatically convert to a Base Rate Loan); 
provided, however, that (i) each such conversion or continuation shall 
- --------  -------               
be pro-rated among the applicable outstanding Loans to such Borrower 
   ---------                     
of all Lenders, and (ii) no portion of the outstanding principal amount of any
Loans may be continued as, or be converted into, LIBO Rate Loans when any
Default has occurred and is continuing.

    SECTION 2.5.  Funding.  Each Lender may, if it so elects, fulfill 
                  -------
its obligation to make, continue or convert LIBO Rate Loans hereunder by causing
one of its foreign branches or affiliates (or an international banking facility
created by such Lender) to make or maintain such LIBO Rate Loan; provided, 
                                                                 --------  
however, that such LIBO Rate Loan shall nonetheless be deemed to have been made
- -------           
and to be held by such Lender, and the obligation of the applicable Borrower to
repay such LIBO Rate Loan shall nevertheless be to such Lender for the account
of such foreign branch, affiliate or international banking facility. In
addition, each Borrower hereby consents and agrees that, for purposes of any
determination to be made for purposes of Sections 4.1, 4.2, 4.3 or 4.4, 
                                         ------------  ---  ---    --- 
it shall be conclusively assumed that each Lender elected to fund all LIBO Rate
Loans to such Borrower by purchasing, as the case may be, Dollar certificates of
deposit in the U.S. or Dollar deposits in its LIBOR Office's interbank
eurodollar market.

    SECTION 2.6. Notes. Each Lender's Loans to a Borrower under its Commitment
                 -----
shall be evidenced by a Note payable by such Borrower to the order of such
Lender in a maximum principal amount equal to such Lender's Percentage of the
Commitment Amount. Each Lender shall, and is hereby irrevocably authorized by
each Borrower to, make (or cause to be made) appropriate notations on the grids
attached to such Lender's Notes (or on any continuation of such grids), or
otherwise to record in such Lender's internal records, appropriate notations, in
each case evidencing, inter alia, the date of, the outstanding principal 
                      ----- ---- 
of, and the interest rate and Interest Period applicable to the Loans to such
Borrower. The failure of any Lender to make any such notations shall not limit
or otherwise affect any Obligations of the applicable Borrower.

    SECTION 2.7.  Extension of Scheduled Commitment Termination Date.
                  --------------------------------------------------
The Scheduled Commitment Termination Date is subject to extension pursuant to
this Section 2.7.
     ----------- 

                                      -14-
<PAGE>
 
    SECTION 2.7.1. Request for Extension. Within 45 days prior to the then
                   --------------------- 
Scheduled Commitment Termination Date (but no later than the thirtieth day prior
to the then Scheduled Commitment Termination Date), the Borrowers may revocably
request (in writing) the Lenders to extend the Scheduled Commitment Termination
Date to the date that is exactly one year after the then Scheduled Commitment
Termination Date; provided, however, that if such date is not a Business Day,
                  --------  ------- 
the Borrowers shall request such extension to the Business Day immediately
preceding the date that is exactly one year after the then Scheduled Commitment
Termination Date. Such request shall be delivered to the Administrative Agent
(such applicable requested date, the "Extension Date"). The Administrative Agent
                                      -------------- 
shall promptly notify the Lenders thereof.

    SECTION 2.7.2.  Effectiveness of Extension.
                    -------------------------- 

    (a)  Such extension shall become effective as of the then Scheduled
Commitment Termination Date if all of the following conditions shall have been
satisfied: (a) within 30 days of, but no later than the twentieth day prior to
the then Scheduled Commitment Termination Date, Lenders with Commitments
aggregating at least 66% of all Lenders' Commitments (the "Consenting Lenders")
                                                            ------------------  
shall have provided to the Administrative Agent their respective written
agreement to such extension, (b) both before and after giving effect to such
extension, on the Extension Date, (i) the representations and warranties set
forth in Article VI shall be true and correct as if then made and (ii) no
         ----------                                                      
Default shall have then occurred and be continuing, and (c) the Borrowers shall
have delivered to the Administrative Agent, a certificate, dated such Extension
Date, of an Authorized Officer of each Borrower certifying that the conditions
in clause (b) have been fully satisfied.  If any Lender does not so notify the
   ----------                                                                 
Administrative Agent of its decision within the period specified in Section
                                                                    -------
2.7.2(a), such Lender shall be deemed not to have consented to such request of
- --------                                                                      
the Borrowers.


    (b)  Each Lender that does not provide its consent to such extension (a
"Non-Consenting Lender") hereby agrees that if, on or prior to the then
- ----------------------                                                 
Scheduled Commitment Termination Date, any other Lender or other financial
institution acceptable to the Borrowers and the Administrative Agent (the
consent of the Administrative Agent not to be unreasonably withheld) offers to
purchase such Non-Consenting Lender's Percentage of the Commitment Amount for a
purchase price equal to the sum of all amounts then owing with respect to the
Loans and all other amounts accrued for the account of such Non-Consenting
Lender, such Non-Consenting Lender will assign, sell and transfer on the then
Scheduled Commitment Termination Date all of its right, title, interest and
obligations with respect to the foregoing to such other Lender or financial
institution pursuant to the terms 

                                      -15-
<PAGE>
 
of Section 10.11.1 and upon the effectiveness of such assignment, such Assignee
   ---------------                           
Lender shall on such Scheduled Commitment Termination Date have a Commitment in
the amount so assigned and be a Lender with a Commitment on and after the
Extension Date.

    (c) If the Borrowers have requested an extension and there remains any Non-
Consenting Lender which has not been replaced pursuant to Section 2.7.2(b), the
                                                          ----------------     
Borrowers, at least 15 days prior to the Scheduled Commitment Termination Date
(without giving effect to the requested extension), may revoke the request for
extension and the Scheduled Commitment Termination Date shall not be extended
and the Stated Maturity Date shall remain unchanged for all Lenders.  If no such
notice of revocation is given by the Borrowers, on the date that would have been
the Scheduled Commitment Termination Date had the Scheduled Commitment
Termination Date not been extended pursuant to the terms of this Section, the
outstanding Loans of any Non-Consenting Lender that were not purchased pursuant
to Section 2.7.2(b) will mature and be due and payable on the then Scheduled
   ----------------                                                         
Commitment Termination Date, subject to the other terms hereof, and the
Commitment of such Non-Consenting Lender will thereupon terminate on such
Scheduled Commitment Termination Date.  On such Scheduled Commitment Termination
Date, the Commitment Amount will be automatically reduced by an amount equal to
the product of (i) the sum of the Percentages of all Non-Consenting Lenders that
were not purchased pursuant to Section 2.7.2(b), and (ii) the Commitment Amount
                               ----------------                                
(whether used or unused) on such Scheduled Commitment Termination Date
immediately prior to such calculation.


    (d) The Percentages of the Consenting Lenders and any assignees pursuant to
                                                                               
Section 2.7.2(b) shall be adjusted accordingly by the Administrative Agent,
- ----------------                                                           
based on such Lenders' pro rata share of the remaining Commitment Amount.
                       --- ----                                          


                                 ARTICLE III

                  REPAYMENTS, PREPAYMENTS, INTEREST AND FEES
 
    SECTION 3.1. Repayments and Prepayments . On the Stated Maturity Date, each
                  --------------------------
Borrower shall repay in full the unpaid principal amount of each Loan that has
been made to such Borrower. Prior thereto, (a) either Borrower may, from time to
time on any Business Day, make a voluntary prepayment, in whole or in part, of
the outstanding principal amount of any Loans made to such Borrower; 
provided, however, that (i) any such prepayment shall be made pro rata among
- --------  -------                                             --- ----
such Loans of the same type and, if applicable, having the same Interest Period
of all Lenders; (ii) no such prepayment of any LIBO Rate Loan may be made on any
day other than the last day of the Interest Period for such Loan; 

                                      -16-
<PAGE>
 
(iii) all such voluntary prepayments shall require at least three but no more
than five Business Days' prior written notice (or in the case of prepayments of
Base Rate Loans, same day's prior written notice) to the Administrative Agent;
and (iv) all such voluntary partial prepayments shall be in an aggregate minimum
amount of $500,000 (or in the case any partial prepayment of any LIBO Rate Loan,
$1,000,000) and an integral multiple of $100,000; (b) each Borrower shall, on
each date (other than on the Scheduled Commitment Termination Date) when any
reduction in the Commitment Amount shall become effective, make a mandatory
prepayment of each Loan that has been made to such Borrower in an aggregate
amount for both Borrowers equal to the excess, if any, of the aggregate,
outstanding principal amount of all Loans over the Commitment Amount as so
reduced; and (c) each Borrower shall, immediately upon any acceleration of the
maturity of any Loans pursuant to Section 8.2 or Section 8.3, repay each Loan
                                  -----------    -----------                 
that has been made to such Borrower, unless, pursuant to Section 8.3, only a
                                                         -----------        
portion of all Loans is so accelerated, in which case the Borrower shall repay
the portion of the Loans made to such Borrower that have been so accelerated.
Each prepayment of any Loans made pursuant to this Section shall be without
premium or penalty, except as may be required by Section 4.4.  No voluntary
                                                 -----------               
prepayment of principal of any Loans shall cause a reduction in the Commitment
Amount.


    SECTION 3.2. Interest Provisions . Interest on the outstanding principal
amount of Loans shall accrue and be payable in accordance with this Section 3.2.
                                                                    ----------- 

    SECTION 3.2.1. Rates . Loans outstanding accrue interest at a rate per
                   -----
annum: (a) on that portion maintained from time to time as a Base Rate Loan,
equal to the Alternate Base Rate from time to time in effect; and (b) on that
portion maintained as a LIBO Rate Loan, during each Interest Period applicable
thereto, equal to the sum of the LIBO Rate (Reserve Adjusted) for such Interest 
Period plus a margin of 0.27 of 1% per annum.
       ----            

    The "LIBO Rate (Reserve Adjusted)" means, for any Interest Period, a rate
         ----------------------------                                        
per annum (rounded upwards, if necessary, to the nearest 1/16 of 1%) determined
pursuant to the following formula:


       LIBO Rate           =              LIBO Rate
                                -------------------------------
    (Reserve Adjusted)          1.00 - LIBOR Reserve Percentage


The LIBO Rate (Reserve Adjusted) for any Interest Period for LIBO Rate Loans
will be determined by the Administrative Agent on the basis of the LIBOR Reserve
Percentage in effect on, and the applicable rates furnished to and received by
the Administrative Agent from BNS, two Business Days before the first day of
such Interest Period.

                                      -17-
<PAGE>
 
    "LIBO Rate" means, relative to any Interest Period for LIBO Rate Loans, the
     ---------                                                                 
rate of interest equal to the average (rounded upwards, if necessary, to the
nearest 1/16 of 1%) of the rates per annum at which Dollar deposits in
immediately available funds are offered by BNS's LIBOR Office to prime banks in
the London interbank market as at or about 11:00 a.m. London, England time, two
Business Days prior to the beginning of such Interest Period for delivery on the
first day of such Interest Period, and in an amount approximately equal to the
amount of BNS's LIBO Rate Loan and for a period approximately equal to such
Interest Period.


    "LIBOR Reserve Percentage" means, relative to any Interest Period for LIBO
     ------------------------                                                 
Rate Loans, the reserve percentage (expressed as a decimal) equal to the maximum
aggregate reserve requirements (including all basic, emergency, supplemental,
marginal and other reserves and taking into account any transitional adjustments
or other scheduled changes in reserve requirements) specified under regulations
issued from time to time by the F.R.S. Board and then applicable to assets or
liabilities consisting of and including "Eurocurrency Liabilities", as defined
from time to time in Regulation D of the F.R.S. Board, having a term
approximately equal or comparable to such Interest Period.

All LIBO Rate Loans shall bear interest from and including the first day of the
applicable Interest Period to (but not including) the last day of such Interest
Period at the interest rate determined as applicable to such LIBO Rate Loan.



    SECTION 3.2.2. Post-Maturity Rates . After the date any principal amount of
                    -------------------
any Loan is due and payable (whether on the Stated Maturity Date, upon
acceleration or otherwise), or after any other monetary Obligation of either
Borrower shall have become due and payable, such Borrower shall pay, but only to
the extent permitted by law, interest (after as well as before judgment) on such
amounts at a rate per annum (in lieu of the rate per annum set forth in 
Section 3.2.1) equal to the Alternate Base Rate plus a margin of 2% per annum.
- -------------              

    SECTION 3.2.3. Payment Dates . Interest accrued on each Loan shall be
                   -------------
payable, without duplication: (a) on the Stated Maturity Date; (b) on the date
of any payment or prepayment, in whole or in part, of principal outstanding on
such Loan; (c) with respect to Base Rate Loans, on each Monthly Payment Date
occurring after the date of the initial Borrowing hereunder; (d) with respect to
LIBO Rate Loans, the last day of each applicable Interest Period; (e) with
respect to any Base Rate Loans converted into LIBO Rate Loans on a day when
interest would not otherwise have been payable pursuant to clause (c), 
                                                           ---------- 
on the date of such conversion; and (f) on that portion of any Loans the
maturity of which is accelerated pursuant to Section 8.2 or Section 8.3, 
                                             -----------    ----------- 
immediately upon such acceleration. Interest accrued on Loans or other

                                      -18-
<PAGE>
 
monetary Obligations arising under this Agreement or any other Loan Document
after the date such amount is due and payable (whether on the Stated Maturity
Date, upon acceleration or otherwise) shall be payable upon demand.

    SECTION 3.3. Fees . The Borrowers agree to pay the fees set forth in this
                 ----
Section 3.3.
- ----------- 

    SECTION 3.3.1. Facility Fee . The Borrowers agree to pay to the
                   ------------
Administrative Agent for the account of each Lender, for the period (including
any portion thereof when its Commitment is suspended by reason of either
Borrower's inability to satisfy any condition of Article V) commencing on (and
                                                 ---------
including) the Effective Date and continuing through the Commitment Termination
Date, a non-refundable facility fee at the rate of .08 of 1% per annum on such
Lender's Percentage of the Commitment Amount (regardless of usage). Such
facility fees shall be payable by the Borrowers in arrears on each Quarterly
Payment Date, commencing with the first such day following the Effective Date,
and on the Commitment Termination Date.

    SECTION 3.3.2. Administration Fee . The Borrowers agree to pay to the
                   ------------------
Administrative Agent for its own account, an administration fee agreed to in
writing by the Administrative Agent and the Borrowers.



                                  ARTICLE IV

                    CERTAIN, LIBO RATE AND OTHER PROVISIONS
 
    SECTION 4.1. LIBO Rate Lending Unlawful. If any Lender shall determine
                 --------------------------
(which determination shall, upon notice thereof to the Borrowers and the
Lenders, be conclusive and binding on the Borrowers) that the introduction of or
any change in or in the interpretation of any law makes it unlawful, or any
central bank or other governmental authority asserts that it is unlawful, for
such Lender to make, continue or maintain any Loan as, or to convert any Loan
into, a LIBO Rate Loan, the obligations of all Lenders to make, continue,
maintain or convert any such Loans shall, upon such determination, forthwith be
suspended until such Lender shall notify the Administrative Agent that the
circumstances causing such suspension no longer exist, and all LIBO Rate Loans
shall automatically convert into Base Rate Loans at the end of the then current
Interest Periods with respect thereto or sooner, if required by such law or
assertion.


    SECTION 4.2. Deposits Unavailable . If the Administrative Agent shall have
                 --------------------
determined that (a) Dollar deposits, as the case may be, in the relevant amount
and for the relevant Interest Period are not available to BNS in its relevant
market, or (b) by 

                                      -19-
<PAGE>
 
reason of circumstances affecting BNS' relevant market, adequate means do not
exist for ascertaining the interest rate applicable hereunder to LIBO Rate
Loans, then, in either case, upon notice from the Administrative Agent to the
Borrowers and the Lenders, the obligations of all Lenders under Section 2.3 and
                                                                -----------
Section 2.4 to make or continue any Loans as, or to convert any Loans into, LIBO
- ----------- 
Rate Loans shall forthwith be suspended until the Administrative Agent shall
notify the Borrowers and the Lenders that the circumstances causing such
suspension no longer exist.


    SECTION 4.3. Increased LIBO Rate Loan Costs, etc. Each Borrower agrees to
                 ----------------------------------- 
reimburse each Lender for any increase in the cost to such Lender of, or any
reduction in the amount of any sum receivable by such Lender in respect of,
making, continuing or maintaining (or of its obligation to make, continue or
maintain) any Loans to such Borrower as, or of converting (or of its obligation
to convert) any such Loans into, LIBO Rate Loans. Such reimbursement obligation
shall apply only to the extent such increased cost or reduced sum results from
(a) any change in law or regulation (other than any such change which increases
reserve costs, to the extent that such increase is included in the calculation
of LIBO Rate (Reserve Adjusted) for the relevant Interest Periods) or in the
interpretation of any law or regulation or (b) the compliance with any guideline
or request from any central bank or other governmental authority (whether or not
having the force of law) promulgated after the date hereof. Such Lender shall
promptly notify the Administrative Agent and the Borrowers in writing of the
occurrence of any such event, such notice to state, in reasonable detail, the
reasons therefor and the additional amount required fully to compensate such
Lender for such increased cost or reduced amount. Such additional amounts shall
be payable by the applicable Borrower directly to such Lender within five days
of its receipt of such notice, and such notice shall, in the absence of manifest
error, be conclusive and binding on the Borrowers.

    SECTION 4.4. Funding Losses . In the event any Lender shall incur any loss
                 --------------
or expense (including any loss or expense incurred by reason of the liquidation
or reemployment of deposits or other funds acquired by such Lender to make,
continue or maintain any portion of the principal amount of any Loan as, or to
convert any portion of the principal amount of any Loan into, a LIBO Rate Loan)
as a result of: (a) any conversion or repayment or prepayment of the principal
amount of any LIBO Rate Loans on a date other than the scheduled last day of the
Interest Period applicable thereto, whether pursuant to Section 3.1 or
                                                        -----------   
otherwise, (b) any Loans not being made as LIBO Rate Loans in accordance with
the Borrowing Request therefor (other than as a result of the default by such
Lender to make such Loans), or (c) any Loans not being continued as, or
converted into, LIBO Rate Loans in accordance with the Continuation/ Conversion
Notice therefor

                                      -20-
<PAGE>
 
(other than as a result of the default by such Lender to continue or convert
such Loans), then, in each case, upon the written notice of such Lender to the
relevant Borrower (with a copy to the Administrative Agent), such Borrower
shall, within five days of its receipt thereof, pay directly to such Lender such
amount as will (in the reasonable determination of such Lender) reimburse such
Lender for such loss or expense. Such written notice (which shall include
calculations in reasonable detail) shall, in the absence of manifest error, be
conclusive and binding on such Borrower.

    SECTION 4.5. Increased Capital Costs . If any change in, or the
                 -----------------------
introduction, adoption, effectiveness, interpretation, reinterpretation or 
phase-in after the date hereof of, any law or regulation, directive, guideline,
decision or request (whether or not having the force of law) of any court,
central bank, regulator or other governmental authority affects or would affect
the amount of capital required or expected to be maintained by any Lender or any
Person controlling such Lender, and such Lender determines (in its sole and
absolute discretion) that the rate of return on its or such controlling Person's
capital as a consequence of its Commitment or the Loans made by such Lender is
reduced to a level below that which such Lender or such controlling Person could
have achieved but for the occurrence of any such circumstance, then, in any such
case upon notice from time to time by such Lender to the Borrowers, the
Borrowers shall immediately pay directly to such Lender additional amounts
sufficient to compensate such Lender or such controlling Person for such
reduction in rate of return. A statement of such Lender as to any such
additional amount or amounts (including calculations thereof in reasonable
detail) shall, in the absence of manifest error, be conclusive and binding on
the Borrowers. In determining such amount, such Lender may use any method of
averaging and attribution that it (in its sole and absolute discretion) shall
deem applicable.

    SECTION 4.6. Taxes . All payments by each Borrower of principal of, and
                 -----
interest on, the Loans and all other amounts payable hereunder shall be made
free and clear of and without deduction for any present or future income,
excise, stamp or franchise taxes and other taxes, fees, duties, withholdings or
other charges of any nature whatsoever imposed by any taxing authority, but
excluding franchise taxes and taxes imposed on or measured by any Lender's net
income or receipts (such non-excluded items being called "Taxes").  In the 
                                                          -----
event that any withholding or deduction from any payment to be made by either
Borrower hereunder is required in respect of any Taxes pursuant to any
applicable law, rule or regulation, then such Borrower will: (a) pay directly to
the relevant authority the full amount required to be so withheld or deducted;
(b) promptly forward to the Administrative Agent an official receipt or other

                                      -21-
<PAGE>
 
documentation satisfactory to the Administrative Agent evidencing such payment
to such authority; and (c) pay to the Administrative Agent for the account of
the Lenders such additional amount or amounts as is necessary to ensure that the
net amount actually received by each Lender will equal the full amount such
Lender would have received had no such withholding or deduction been required.
Moreover, if any Taxes are directly asserted against the Administrative Agent or
any Lender with respect to any payment received by the Administrative Agent or
such Lender hereunder, the Administrative Agent or such Lender may pay such
Taxes and the Borrowers will promptly pay such additional amounts (including any
penalties, interest or expenses) as is necessary in order that the net amount
received by such person after the payment of such Taxes (including any Taxes on
such additional amount) shall equal the amount such person would have received
had not such Taxes been asserted.

    If either Borrower fails to pay any Taxes when due to the appropriate taxing
authority or fails to remit to the Administrative Agent, for the account of the
respective Lenders, the required receipts or other required documentary
evidence, such Borrower shall indemnify the Lenders for any incremental Taxes,
interest or penalties that may become payable by any Lender as a result of any
such failure.  For purposes of this Section 4.6, a distribution hereunder by the
                                    -----------                                 
Administrative Agent or any Lender to or for the account of any Lender shall be
deemed a payment by the applicable Borrower.

    Upon the request of either Borrower or the Administrative Agent, each Lender
that is organized under the laws of a jurisdiction other than the United States
shall, prior to the due date of any payments under the Notes, execute and
deliver to such Borrower and the Administrative Agent, on or about the first
scheduled payment date in each Fiscal Year, one or more (as such Borrower or the
Administrative Agent may reasonably request) United States Internal Revenue
Service Forms 4224 or Forms 1001 or such other forms or documents (or successor
forms or documents), appropriately completed, as may be applicable to establish
the extent, if any, to which a payment to such Lender is exempt from withholding
or deduction of Taxes.

    SECTION 4.7. Payments, Computations, etc. Unless otherwise expressly
                 --------------------------- 
provided, all payments by either Borrower pursuant to this Agreement, the Notes
or any other Loan Document shall be made to the Administrative Agent for the pro
                                                                             ---
rata account of the Lenders entitled to receive such payment. All such payments
- ----
required to be made to the Administrative Agent shall be made, without setoff,
deduction or counterclaim, not later than 11:00 a.m., New York City time, on the
date due, in same day or immediately available funds, to such account as the
Administrative Agent shall specify from time to time by notice to 

                                      -22-
<PAGE>
 
the Borrowers. Funds received after that time shall be deemed to have been
received by the Administrative Agent on the next succeeding Business Day. The
Administrative Agent shall promptly remit in same day funds to each Lender its
share, if any, of such payments received by the Administrative Agent for the
account of such Lender. All interest and fees shall be computed on the basis of
the actual number of days (including the first day but excluding the last day)
occurring during the period for which such interest or fee is payable over a
year comprised of 360 days (or, in the case of interest on a Base Rate Loan, 365
days or, if appropriate, 366 days). Whenever any payment to be made shall
otherwise be due on a day which is not a Business Day, such payment shall
(except as otherwise required by clause (c) of the definition of the term 
                                 ----------                             
"Interest Period" with respect to LIBO Rate Loans) be made on the next
 ---------------      
succeeding Business Day and such extension of time shall be included in
computing interest and fees, if any, in connection with such payment.

    SECTION 4.8. Sharing of Payments . If any Lender shall obtain any payment or
                 -------------------
other recovery (whether voluntary, involuntary, by application of setoff or
otherwise) on account of any Loan (other than pursuant to the terms of Sections
                                                                       --------
4.3, 4.4, 4.5 and 4.6) in excess of its pro rata share of payments then or 
- ---  ---  ---     ---                   --- ---- 
therewith obtained by all Lenders, such Lender shall purchase from the other
Lenders such participations in Loans made by them as shall be necessary to cause
such purchasing Lender to share the excess payment or other recovery ratably 
with each of them; provided, however, that if all or any portion of the excess
                   --------  -------
payment or other recovery is thereafter recovered from such purchasing Lender,
the purchase shall be rescinded and each Lender which has sold a participation
to the purchasing Lender shall repay to the purchasing Lender the purchase price
to the ratable extent of such recovery together with an amount equal to such
selling Lender's ratable share (according to the proportion of (a) the amount of
such selling Lender's required repayment to the purchasing Lender to (b) the 
                                                                  --
total amount so recovered from the purchasing Lender), of any interest or other
amount paid or payable by the purchasing Lender in respect of the total amount
so recovered. The Borrowers agree that any Lender so purchasing a participation
from another Lender pursuant to this Section may, to the fullest extent
permitted by law, exercise all its rights of payment (including pursuant to
Section 4.9) with respect to such participation as fully as if such Lender were
- -----------      
the direct creditor of the Borrowers in the amount of such participation. If
under any applicable bankruptcy, insolvency or other similar law, any Lender
receives a secured claim in lieu of a setoff to which this Section applies, such
Lender shall, to the extent practicable, exercise its rights in respect of such
secured claim in a manner consistent with the rights of the Lenders entitled
under this Section to share in the benefits of any recovery on such secured
claim.

                                      -23-
<PAGE>
 
    SECTION 4.9. Setoff . Each Lender shall, upon the occurrence of any Default
                 ------
described in clauses (a) through (d) of Section 8.1.9 or any other Event of
             -----------         ---    -------------
Default, and to the extent permitted by applicable law, have the right to
appropriate and apply to the payment of the Obligations owing to it (whether or
not then due) by either Borrower, any and all balances, credits, deposits,
accounts or monies of such Borrower then or thereafter maintained with such
Lender; provided, however, that any such appropriation and application shall 
        --------  ------- 
be subject to the provisions of Section 4.8. Each Lender agrees promptly to
                                ----------- 
notify the Borrowers and the Administrative Agent after any such setoff and
application made by such Lender; provided, however, that the failure to give
                                 --------  -------
such notice shall not affect the validity of such setoff and application. The
rights of each Lender under this Section are in addition to other rights and
remedies (including other rights of setoff under applicable law or otherwise)
which such Lender may have.


    SECTION 4.10. Use of Proceeds . Each Borrower shall apply the proceeds of
                  ---------------
each Borrowing for general corporate purposes (including acquisitions of stock
and assets). No proceeds of any Loan will be used to acquire any equity security
of a class which is registered pursuant to Section 12 of the Securities Exchange
Act of 1934, as amended, or to acquire or carry any "margin stock", as defined
in F.R.S. Board Regulation U; provided, however, that Ambac Financial may use
                              --------  -------   
the proceeds of any Borrowing to purchase issued and outstanding shares of its
common stock, par value of $.01 per share, for issuance to its employees and/or
directors under its employee or director stock plans or to any of its
Subsidiaries' employees under its employee stock plans or its Subsidiaries'
employee stock plans.


                                 ARTICLE V

                  CONDITIONS TO CLOSING DATE AND TO BORROWING
 

    SECTION 5.1. Closing Date. The closing hereunder shall occur subject to the
                 ------------
prior or concurrent satisfaction of each of the conditions precedent set forth
in this Section 5.1.
        ----------- 


    SECTION 5.1.1. Resolutions, etc. The Administrative Agent shall have
                   ---------------- 
received from each Borrower a certificate, dated the Closing Date, of its
Secretary or Assistant Secretary as to: (a) resolutions of its Board of
Directors then in full force and effect authorizing the execution, delivery and
performance of the Loan Documents to be executed by such Borrower; and (b) the
incumbency and signatures of those of its officers authorized to act with
respect to the Loan Documents to be executed by such Borrower. Each Lender may
conclusively rely on such certificate until it shall have received a further
certificate of the

                                      -24-
<PAGE>
 
Secretary or an Assistant Secretary of such Borrower canceling or amending such
prior certificate.

    SECTION 5.1.2. Delivery of Notes. The Administrative Agent shall have
                   -----------------
received, for the account of each Lender, Notes dated the Closing Date, duly
executed and delivered by the Borrowers.

    SECTION 5.1.3. Opinions of Counsel. The Administrative Agent shall have
                   -------------------
received opinions, dated the Closing Date and addressed to the Administrative
Agent and all Lenders, from (a) Shearman & Sterling, special counsel to the
Borrowers, substantially in the form of Exhibit E-1 hereto; (b) Anne G. Gill,
                                        -----------
Vice President, Counsel and Assistant Secretary to Ambac Financial,
substantially in the form of Exhibit E-2 hereto; (c) Anne G. Gill, Vice
                             -----------        
President, Assistant General Counsel and Assistant Secretary to Ambac Assurance,
substantially in the form of Exhibit E-3 hereto; (d) DeWitt Ross & Stevens, 
                             -----------        
S.C., special Wisconsin counsel to Ambac Assurance, substantially in the form of
Exhibit E-4 hereto; and (e) Mayer, Brown & Platt, special counsel to the
- -----------                                      
Administrative Agent, substantially in the form of Exhibit F hereto.
                                                   ---------        

    SECTION 5.1.4.  Closing Fees, Expenses, etc.
                    --------------------------- 
      The Administrative Agent shall have received payment of all fees, costs
and expenses due and payable pursuant to Section 10.3, if then invoiced.
                                         ------------                   

    SECTION 5.1.5. Notification. The Administrative Agent shall promptly notify
                   ------------
the Borrowers and the Lenders of the Closing Date, and such notice shall be
conclusive and binding on all parties hereto.


    SECTION 5.2. All Borrowings . The obligation of each Lender to fund any Loan
                 --------------
on the occasion of any Borrowing (including the initial Borrowing) shall be
subject to (a) the fact that the Closing Date shall have occurred, and (b) the
satisfaction of each of the conditions precedent set forth in this Section 5.2.
                                                                   -----------

    SECTION 5.2.1.  Compliance with Warranties, No Default, etc.
                    ------------------------------------------- 
Both before and after giving effect to any Borrowing (but, if any Default
of the nature referred to in Section 8.1.5 shall have occurred with respect to
                             -------------                                    
any other Indebtedness, without giving effect to the application, directly or
indirectly, of the proceeds thereof) the following statements shall be true and
correct: (a) the representations and warranties set forth in Article VI
                                                             ----------
(excluding, however, those contained in Section 6.7) shall be true and correct
                                        -----------                           
with the same effect as if then made (unless stated to relate solely to an
earlier date, in which case such representations and warranties shall be true
and correct as of such earlier date); (b) except as disclosed by either Borrower
to the Administrative Agent and the Lenders pursuant to 

                                      -25-
<PAGE>
 
Section 6.7, (i) no labor controversy, litigation, arbitration or governmental
- -----------
investigation or proceeding shall be pending or, to the knowledge of either
Borrower, threatened against either Borrower or any of its Subsidiaries which
may reasonably be expected to have any Material Adverse Effect or which purports
to affect the legality, validity or enforceability of any Loan Document, and
(ii) no development shall have occurred in any labor controversy, litigation,
arbitration or governmental investigation or proceeding disclosed pursuant to
Section 6.7 which may reasonably be expected to have any Material Adverse
- -----------                                                              
Effect; (c) no Default shall have then occurred and be continuing; and (d)
neither Borrower nor any Subsidiary thereof is in material violation of any law
or governmental regulation or court order or decree.



    SECTION 5.2.2. Borrowing Request. The Administrative Agent shall have
                   -----------------
received a Borrowing Request for such Borrowing. Each of the delivery of a
Borrowing Request and the acceptance by either Borrower of the proceeds of such
Borrowing shall constitute a representation and warranty by such Borrower that
on the date of such Borrowing (both immediately before and after giving effect
to such Borrowing and the application of the proceeds thereof) the statements
made in Section 5.2.1 are true and correct.
        -------------    

    SECTION 5.2.3. Satisfactory Legal Form. All documents executed or submitted
                   -----------------------
pursuant hereto by or on behalf of each Borrower or any of its Subsidiaries or
any other Obligors shall be satisfactory in form and substance to the
Administrative Agent and its counsel; the Administrative Agent and its counsel
shall have received all information, approvals, opinions, documents or
instruments as the Administrative Agent or its counsel may reasonably request.


                                 ARTICLE VI

                        REPRESENTATIONS AND WARRANTIES
 

    In order to induce the Lenders and the Agents to enter into this Agreement
and to make Loans hereunder, each Borrower represents and warrants unto the
Agents and each Lender as set forth in this Article VI.
                                            ---------- 


    SECTION 6.1. Organization, etc. Each Borrower and each of its Material
                 ----------------- 
Subsidiaries (a) is a corporation or partnership validly organized and existing
and in good standing under the laws of the State of its incorporation or
formation, as the case may be, and (b) is duly qualified to do business and is
in good standing as a foreign corporation or partnership in each jurisdiction
where the nature of its business requires such 

                                      -26-
<PAGE>
 
qualification, and has full power and authority and holds all requisite
governmental licenses, permits and other approvals to enter into and perform its
Obligations under each Loan Document to which it is a party and to own and hold
under lease its property and to conduct its business substantially as conducted
by it, except where the failure to be so qualified or hold such licenses,
permits and approvals, singly or in the aggregate, could not reasonably be
expected to have any Material Adverse Effect.

    SECTION 6.2. Due Authorization, Non-Contravention, etc. The execution,
                 ----------------------------------------- 
delivery and performance by each Borrower of each Loan Document to which it is a
party are within such Borrower's corporate powers, have been duly authorized by
all necessary corporate action, and do not (a) contravene such Borrower's
Organic Documents; (b) contravene any contractual restriction, law or
governmental regulation or court decree or order binding on or affecting such
Borrower; or (c) result in, or require the creation or imposition of, any Lien
on any of such Borrower's properties.

    SECTION 6.3. Government Approval, Regulation, etc. No authorization or
                 ------------------------------------ 
approval or other action by, and no notice to or filing with, any governmental
authority or regulatory body or other Person is required for the due execution,
delivery or performance by either Borrower of any Loan Document. Neither
Borrower is an "investment company" within the meaning of the Investment Company
Act of 1940, as amended.

    SECTION 6.4. Validity, etc. Each Loan Document constitutes, the legal, valid
                 ------------- 
and binding obligation of each Borrower party thereto, enforceable in accordance
with its terms.

    SECTION 6.5. Financial Information . The consolidated balance sheet of Ambac
                 ---------------------
Financial and its Subsidiaries as at December 31, 1997, and the related
consolidated statements of operations and of cash flow of Ambac Financial and
its Subsidiaries, copies of which have been furnished to the Administrative
Agent and each Lender, have been prepared in accordance with GAAP consistently
applied, and present fairly the consolidated financial condition of Ambac
Financial and its Subsidiaries as at the date thereof and the results of their
operations for the period then ended.

    SECTION 6.6. No Material Adverse Change . Since the date of the financial
                 --------------------------
statements described in Section 6.5, there has been no material adverse change
                        -----------
in the financial condition, operations, or business of either Borrower.


    SECTION 6.7.  Litigation, Labor Controversies, etc. There is no pending 
                  ------------------------------------ 
or, to the knowledge of either Borrower, threatened

                                      -27-
<PAGE>
 
litigation, action, proceeding, or labor controversy affecting either Borrower
or any Material Subsidiary thereof, or any of their respective properties,
businesses, assets or revenues, which may reasonably be expected to have any
Material Adverse Effect or which purports to affect the legality, validity or
enforceability of any Loan Document, except as disclosed in Item 6.7
                                                            --------
("Litigation") of the Disclosure Schedule.

    SECTION 6.8. Taxes. Each Borrower and each of its Subsidiaries has filed
                 -----
all tax returns and reports required by law to have been filed by it and has
paid all taxes and governmental charges thereby shown to be owing, except any
such taxes or charges which are being diligently contested in good faith by
appropriate proceedings and for which adequate reserves in accordance with GAAP
(or statutory accounting principles, as appropriate) shall have been set aside
on its books and except where the failure to file said returns or reports or to
pay such taxes or charges could not reasonably be expected to have a Material
Adverse Effect.

    SECTION 6.9. Pension and Welfare Plans. During the twelve-consecutive-month
                 -------------------------
period prior to the date of the execution and delivery of this Agreement and
prior to the date of any Borrowing hereunder, except as disclosed in Item 6.9
                                                                     --------
("Employee Benefit Plans") of the Disclosure Schedule, no steps have been taken
to terminate any Pension Plan, and no contribution failure has occurred with
respect to any Pension Plan sufficient to give rise to a Lien under section
302(f) of ERISA. No condition exists or event or transaction has occurred with
respect to any Pension Plan which might result in the incurrence by either
Borrower or any member of the Controlled Group of any material liability, fine
or penalty other than a non-defaulted obligation to make a contribution under
Section 302 of ERISA. Except as disclosed in Item 6.9 ("Employee Benefit Plans")
- --------                                                       
of the Disclosure Schedule, each Borrower and each member of the Controlled
Group does not have any contingent liability with respect to any post-retirement
benefit under a Welfare Plan, other than liability for continuation coverage
described in Part 6 of Title I of ERISA.

    SECTION 6.10. Regulation U. Each Borrower is not engaged in the business of
                  ------------
extending credit for the purpose of purchasing or carrying margin stock, and no
proceeds of any Loans will be used for a purpose which violates, or would be
inconsistent with, F.R.S. Board Regulation U. After applying the proceeds of
each Loan, not more than 25% of the value of the assets of either Borrower or of
either Borrower and its Subsidiaries, on a consolidated basis, are margin stock
or margin securities. Terms for which meanings are provided in F.R.S. Board
Regulation U or any regulation substituted therefor, as from time to time in
effect, are used in this Section with such meanings.

                                      -28-
<PAGE>
 
    SECTION 6.11. Accuracy of Information. All factual information heretofore
                  -----------------------
or contemporaneously furnished by or on behalf of either Borrower in writing to
any Agent or any Lender for purposes of or in connection with this Agreement is,
and all other such factual information hereafter furnished by or on behalf of
such Borrower to any Agent or any Lender will be, true and accurate in every
material respect on the date as of which such information is dated or certified
and as of the date of execution and delivery of this Agreement by the Agents and
such Lender.

    SECTION 6.12. Year 2000. Each Borrower and its respective Subsidiaries have
                  ---------
reviewed the areas within their respective businesses and operations which could
be adversely affected by, and has developed or is developing a program to
address on a timely basis, the "Year 2000 Problem" (that is, the risk that
computer applications used by such Borrower or its Subsidiaries may be unable to
recognize and properly perform date-sensitive functions involving certain dates
prior to and any date after December 31, 1999). Based on such review and
program, the Year 2000 Problem could not reasonably be expected to have a
Material Adverse Effect.


                                  ARTICLE VII

                                   COVENANTS
 

    SECTION 7.1. Affirmative Covenants. Each Borrower agrees with the Agents
                 ---------------------
and each Lender that, until all Commitments have terminated and all Obligations
have been paid and performed in full, each Borrower will perform its obligations
set forth in this Section 7.1.
                  -----------

    SECTION 7.1.1.  Financial Information, Reports, Notices, etc.
                    -------------------------------------------- 
    (a)  Ambac Financial will furnish, or will cause to be furnished, to each
Lender and the Administrative Agent copies of the following financial
statements, reports, notices and information: (i) as soon as available and in
any event within 60 days after the end of each of the first three Fiscal
Quarters of each Fiscal Year of Ambac Financial, consolidated balance sheets of
Ambac Financial and its Subsidiaries as of the end of such Fiscal Quarter and
consolidated statements of operations and of cash flow of Ambac Financial and

                                      -29-
<PAGE>
 
its Subsidiaries for such Fiscal Quarter and for the period commencing at the
end of the previous Fiscal Year and ending with the end of such Fiscal Quarter,
certified by the chief financial Authorized Officer of Ambac Financial; (ii) as
soon as available and in any event within 120 days after the end of each Fiscal
Year of Ambac Financial, a copy of the annual report for such Fiscal Year for
Ambac Financial and its Subsidiaries, including therein consolidated balance
sheets of Ambac Financial and its Subsidiaries as of the end of such Fiscal Year
and consolidated statements of operations and of cash flow of Ambac Financial
and its Subsidiaries for such Fiscal Year, in each case certified (without any
Impermissible Qualification) in a manner acceptable to the Administrative Agent
and the Required Lenders by KPMG Peat Marwick or other independent public
accountants acceptable to the Administrative Agent and the Required Lenders; and
(iii) promptly after the sending or filing thereof, copies of all reports which
Ambac Financial sends to its security holders generally, and all reports and all
registration statements containing final prospectuses (excluding registration
statements on SEC Form S-8 or any successor form) which Ambac Financial or any
of its Subsidiaries files with the SEC or any national securities exchange.

    (b)  Ambac Assurance will furnish, or will cause to be furnished, to each
Lender and the Administrative Agent copies of the following financial
statements, reports, notices and information:  (i) as soon as available and in
any event within 60 days after the end of each of the first three Fiscal
Quarters of each Fiscal Year, the quarterly statement of Ambac Assurance for
such quarter as filed with the Office of Commissioner of Insurance of the State
of Wisconsin, certified as to fairness of presentation, generally accepted
statutory accounting principles and consistency by the chief financial
Authorized Officer of Ambac Assurance; and (ii) as soon as available and in any
event within 120 days after the end of each Fiscal Year, the annual statement of
Ambac Assurance for such year, as filed with the Office of Commissioner of
Insurance of the State of Wisconsin, certified as to fairness of presentation,
generally accepted statutory accounting principles and consistency by the chief
financial Authorized Officer of Ambac Assurance.

    (c)  As soon as available and in any event within 60 days after the end of
each of the first three Fiscal Quarters of each Fiscal Year and within 120 days
after the end of the Fiscal Year (but in any event no later than the date(s) on
which the applicable financial statements are delivered pursuant to Sections
                                                                    --------
7.1.1(a) and (b), respectively), a Compliance Certificate, executed by the chief
- --------     ---                                                                
executive, financial or accounting Authorized Officer of each Borrower, showing
(in reasonable detail and with appropriate calculations and computations in all
respects reasonably satisfactory to the Administrative Agent) compliance with
                                                                             
Section 7.2.5 and certifying no Default.
- -------------                           

    (d)  Each Borrower will furnish, or will cause to be furnished, to each
Lender and the Administrative Agent copies of the following notices and
information:  (i) as soon as possible 

                                      -30-
<PAGE>
 
and in any event within three days after actual knowledge by such Borrower of
the occurrence of any Default, a statement of the chief financial Authorized
Officer of such Borrower setting forth details of such Default and the action
which such Borrower has taken and proposes to take with respect thereto; and
(ii) such other information respecting the condition or operations, financial or
otherwise, of such Borrower or any of its Subsidiaries as any Lender through the
Administrative Agent may from time to time reasonably request.

    SECTION 7.1.2. Compliance with Laws, etc. Each Borrower will, and will cause
                   ------------------------- 
each of its Subsidiaries to, comply in all material respects with all applicable
laws, rules, regulations and orders, such compliance to include (without
limitation): (a) qualification as a foreign corporation; and (b) the payment,
before the same become delinquent, of all taxes, assessments and governmental
charges imposed upon it or upon its property except to the extent being
diligently contested in good faith by appropriate proceedings and for which
adequate reserves in accordance with GAAP (or statutory accounting principles,
as appropriate) shall have been set aside on its books; and except where the
failure to be so qualified and the failure of such compliance could not
reasonably be expected to have a Material Adverse Effect.

    SECTION 7.1.3. Maintenance of Properties. Each Borrower will, and will
                   -------------------------
cause each of its Material Subsidiaries to, maintain, preserve, protect and keep
its properties in good repair, working order and condition (ordinary wear and
tear excepted), and make necessary and proper repairs, renewals and replacements
so that its business carried on in connection therewith may be properly
conducted at all times unless such Borrower determines in good faith that the
continued maintenance of any of its properties is no longer economically
desirable.

    SECTION 7.1.4. Insurance. Each Borrower will, and will cause each of its
                   ---------
Material Subsidiaries to, maintain or cause to be maintained (a) with
responsible insurance companies insurance with respect to its properties and
business against such casualties and contingencies and of such types and in such
amounts as is customary in the case of similar businesses or (b) by means of
adequate reserves set aside or maintained out of earnings or surplus, a system
of self-insurance with respect to such properties and business against such
casualties and contingencies and of such types and in such amounts as is
customary in the case of similar businesses; and each Borrower will, upon
request of the Administrative Agent, furnish to each Lender at reasonable
intervals a certificate of an Authorized Officer of such Borrower setting forth
the nature and extent of all insurance or self-insurance maintained by such
Borrower and its Material Subsidiaries in accordance with this Section.

                                      -31-
<PAGE>
 
    SECTION 7.1.5. Books and Records. Each Borrower will, and will cause each
                   -----------------
of its Material Subsidiaries to, keep books and records which accurately reflect
all of its business affairs and transactions and permit the Administrative Agent
and each Lender or any of their respective representatives, at reasonable times
and intervals (and, prior to the occurrence of any Default, with reasonable
prior notice given to the applicable Borrower), to visit all of its offices, to
discuss its financial matters with its officers and independent public
accountant (and each Borrower hereby authorizes such independent public
accountant to discuss such Borrower's financial matters with each Lender or its
representatives) and to examine (and, at the expense of such Borrower, photocopy
extracts from) any of its books or other corporate records.

    SECTION 7.2. Negative Covenants. Each Borrower agrees with the
                 ------------------
Administrative Agent and each Lender that, until all Commitments have terminated
and all Obligations have been paid and performed in full, each Borrower will
perform its obligations set forth in this Section 7.2.
                                          ----------- 

    SECTION 7.2.1. Liens. Each Borrower will not, and will not permit any of
                   -----
its Material Subsidiaries to, create, incur, assume or suffer to exist any Lien
upon any of its property, revenues or assets, whether now owned or hereafter
acquired, to secure Debt of such Borrower or such Material Subsidiary, except:
(a) Liens securing payment of Debt hereunder; (b) any Liens granted prior to the
date hereof securing Debt existing as of the Effective Date which is identified
in Item 7.2.1(b) ("Ongoing Debt") of the Disclosure Schedule; (c) any Lien on
- -------------   ------------                                                  
any asset granted to secure payment of Debt incurred or assumed for the purpose
of financing the acquisition of such asset, provided that such Lien attaches to
such asset no later than the 90th day after such acquisition; (d) any Lien
existing on any asset prior to the acquisition thereof by either Borrower or any
Material Subsidiary thereof and not created in contemplation of such
acquisition; (e) any Lien arising out of the refinancing, extension, renewal or
refunding of any Debt secured by any Lien permitted by clause (b), (c), (d) or
                                                       ----------  ---  ---   
(f) provided that such Debt is not increased and is not secured by any
- ---                                                                   
additional assets; (f) any Lien granted by Ambac Assurance or Connie Lee to the
lenders under the applicable Loss Facility to secure Debt obligations under such
Loss Facility, which Lien is on Ambac Assurance's or Connie Lee's, respectively,
rights to recoveries and premiums under certain financial guarantees issued by
Ambac Assurance or Connie Lee, respectively, and on all proceeds thereof; (g)
any Lien consisting of a pledge by Ambac Assurance of its subrogation rights to
secure Debt for borrowed money, in an aggregate amount outstanding not to exceed
$50,000,000 at any time; and (h) other Liens where the aggregate principal
amount of Debt secured thereby at any time outstanding does not exceed
$50,000,000 in the aggregate.

                                      -32-
<PAGE>
 
    SECTION 7.2.2. Consolidation, Merger, etc. Each Borrower will not, and will
                   -------------------------- 
not permit any of its Material Subsidiaries to, liquidate or dissolve,
consolidate with, or merge into or with, any other corporation, except: (a) any
such Material Subsidiary (other than Ambac Assurance) may liquidate or dissolve
voluntarily into, and may consolidate and merge with and into, either Borrower
or any other Material Subsidiary of either Borrower; and (b) so long as no
Default has occurred and is continuing or would occur after giving effect
thereto, either Borrower may consolidate or merge with and into any other Person
if (i) such Borrower is the surviving entity and such Borrower and its
Subsidiaries, as a whole, will continue to have the financial guaranty business
as one of its principal businesses; or (ii) all of the following are satisfied:
(A) such Person and its Subsidiaries, as a whole, shall have the financial
guaranty business as one of its principal businesses, (B) such Person shall have
assumed all the Obligations of such Borrower pursuant to an instrument in form
and substance reasonably satisfactory to the Required Lenders and shall have
delivered such opinions of counsel with respect thereto as the Administrative
Agent may reasonably request, (C) both immediately prior to and after giving
effect to such consolidation or merger, the ratings on such Person's senior
unsecured debt and (if such Person is an insurer at such time) claims-paying
ability shall be at least as high as the applicable Borrower immediately prior
to such consolidation or merger, and (D) such Person meets each Lender's
internal policies with respect to extensions of credit of the type contemplated
hereunder.


    SECTION 7.2.3. Asset Dispositions, etc. Each Borrower will not, and will not
                   ----------------------- 
permit any of its Material Subsidiaries to, sell, transfer, lease, contribute or
otherwise convey, or grant options, warrants or other rights with respect to,
all or any substantial part of its assets (including accounts receivable and
capital stock of any of its Material Subsidiaries) to any Person (any of the
foregoing, an "Asset Disposition"); provided, however, that each Borrower 
               -----------------    --------  -------
and its Material Subsidiaries may consummate (a) Asset Dispositions in the
ordinary course of their business and (b) any Asset Disposition, to the extent
that immediately after giving effect to such Asset Disposition, the aggregate
fair market value (determined at the time of the applicable transactions) of all
assets subject to Asset Dispositions (other than those described in
clause (a)) consummated by the Borrowers and their respective Subsidiaries in 
- ----------                    
such Fiscal Year) and consummated in such Fiscal Year, would not exceed 25% of
the stockholders' equity of Ambac Financial and its Subsidiaries, on a
consolidated basis (excluding unrealized gains on investments and unrealized
losses on investments), at the end of the immediately preceding Fiscal Quarter.

                                      -33-
<PAGE>
 
    SECTION 7.2.4. Certain Restrictive Agreements, etc. Each Borrower will not,
                   ----------------------------------- 
and will not permit any of its Material Subsidiaries to, enter into any
agreement (excluding this Agreement and any agreement that Ambac Assurance is
required to enter into by the Office of the Commissioner of Insurance of the
State of Wisconsin or any other state insurance regulatory agency) prohibiting
the ability of any such Material Subsidiary to make any payments, directly or
indirectly, to such Borrower by way of dividends, advances, repayments of loans
or advances, reimbursements of management and other intercompany charges,
expenses and accruals or other returns on investments, or any other agreement or
arrangement which restricts the ability of any such Material Subsidiary to make
any payment, directly or indirectly, to such Borrower, provided that the
foregoing shall not apply to restrictions and conditions that, in the aggregate,
could not be reasonably expected to cause a Material Adverse Effect.


    SECTION 7.2.5.  Leverage Ratio. Ambac Financial shall not permit 
                    -------------- 
the Leverage Ratio to exceed .40 to 1.00 at the end of any Fiscal Quarter.



                                 ARTICLE VIII

                               EVENTS OF DEFAULT
 

    SECTION 8.1.  Listing of Events of Default.  Each of the following 
                  ----------------------------
events or occurrences described in this Section 8.1 shall constitute 
                                        -----------
an "Event of Default".
    ----------------  

    SECTION 8.1.1.  Non-Payment of Obligations.  Either Borrower shall default
                    --------------------------
(a) in the payment or prepayment when due of any principal of any Loan, or (b)
in the payment when due of interest on any Loan, any facility fee or any other
Obligation of a monetary nature and such default under this clause (b) shall 
                                                            ---------- 
continue unremedied for five Business Days.


    SECTION 8.1.2.  Breach of Warranty.  Any representation or warranty of 
                    ------------------
either Borrower made or deemed to be made hereunder or in any certificate or
document furnished by or on behalf of either Borrower to the Administrative
Agent or any Lender for the purposes of or in connection with any Loan Document
(including any certificates delivered pursuant to Section 2.7 or Article V) is
                                                  -----------    ---------
or shall be incorrect when made in any material respect.


    SECTION 8.1.3.  Non-Performance of Certain Covenants and Obligations.
                    ----------------------------------------------------
Either Borrower shall default in the due performance and observance of
any of its obligations under Section 7.2 and, if such default shall be in the
                             -----------                                     
due performance and observance of any of its obligations under Section 7.2.1 and
                                                               -------------    

                                      -34-
<PAGE>
 
such default shall be capable of being remedied, such default shall continue
unremedied for 30 days after the earlier of the date on which notice thereof
shall have been given to such Borrower by the Administrative Agent or any Lender
or the date on which either Borrower shall obtain actual knowledge of such
default.

    SECTION 8.1.4.  Non-Performance of Other Covenants and Obligations.
                    --------------------------------------------------
Either Borrower shall default in the due performance and observance of
any other agreement contained in any Loan Document, and such default shall
continue unremedied for a period of 30 days after notice thereof shall have been
given to such Borrower by the Administrative Agent or any Lender.

    SECTION 8.1.5.  Default on Other Indebtedness.  Any of the following shall
                    -----------------------------
occur:

     (a)  a default shall occur in the payment when due (subject to any
     applicable grace period), whether by acceleration or otherwise, of any
     Indebtedness (other than Indebtedness described in Section 8.1.1 or
                                                        -------------   
     Indebtedness under the Loss Facility) of either Borrower or any of its
     Subsidiaries in an amount, individually or in the aggregate, in excess of
     $30,000,000;


     (b)  a default shall occur in the performance or observance of any
     obligation or condition with respect to any Indebtedness (other than
     Indebtedness described in Section 8.1.1 or Indebtedness under the Loss
                               -------------                               
     Facility) of either Borrower or any of its Subsidiaries if (i) the effect
     of such default is to accelerate the maturity of any such Indebtedness
     having a principal amount, individually or in the aggregate, in excess of
     $30,000,000 or (ii) such default shall continue unremedied for any
     applicable period of time sufficient to permit the holder or holders of
     such Indebtedness, or any trustee or agent for such holders, to cause such
     Indebtedness having a principal amount, individually or in the aggregate,
     in excess of $30,000,000 to become due and payable prior to its expressed
     maturity; or

     (c)  a default shall occur in the performance or observance of any
     obligation or condition with respect to any Indebtedness under the Loss
     Facility if the effect of such default is to accelerate the maturity of any
     such Indebtedness having a principal amount in excess of $20,000,000.


    SECTION 8.1.6.  Judgments.  Any unsatisfied judgments or orders for the 
                    ---------
payment of money, singly or in the aggregate, in excess of $30,000,000
(exclusive of judgment amounts to the 

                                      -35-
<PAGE>
 
extent covered by insurance where the insurer has admitted liability in respect
of such judgment) at any time in effect shall be rendered against either
Borrower or any of its Subsidiaries and either: (a) enforcement proceedings
shall have been commenced by any creditor upon such judgment or order; or (b)
there shall be any period of 30 consecutive days during which a stay of
enforcement of such judgment or order, by reason of a pending appeal or
otherwise, shall not be in effect.

    SECTION 8.1.7.  Pension Plans.  Any of the following events shall occur 
                    -------------
with respect to any Pension Plan: (a) the institution of any steps by either
Borrower, any member of its Controlled Group or any other Person to terminate a
Pension Plan if, as a result of such termination, either Borrower or any such
member could be required to make a contribution to such Pension Plan, or could
reasonably expect to incur a liability or obligation to such Pension Plan, in
excess of $20,000,000; or (b) a contribution failure occurs with respect to any
Pension Plan sufficient to give rise to a Lien under Section 302(f) of ERISA.

    SECTION 8.1.8.  Rating.  The rating assigned by Moody's or S&P 
                    ------
to the claims-paying ability of Ambac Assurance shall be lower than the highest
gradation (if any) in the highest rating category of Moody's or S&P respectively
(which highest rating category and gradation on the date hereof are "Aaa" and
"AAA", respectively).

    SECTION 8.1.9.  Bankruptcy, Insolvency, etc.  Either Borrower or any 
                    --------------------------- 
of its Material Subsidiaries shall (a) become insolvent or generally fail to
pay, or admit in writing its inability or unwillingness to pay, debts as they
become due; (b) make a general assignment for the benefit of creditors; (c)
apply for, seek, consent to, acquiesce in, or permit or suffer to exist, the
appointment of a trustee, receiver, sequestrator, conservator, liquidator or
other custodian for either Borrower or any of its Material Subsidiaries or for a
substantial part of the property of any thereof; (d) permit or suffer to exist
the commencement of any bankruptcy, reorganization, debt arrangement or other
case or proceeding under any bankruptcy, insolvency or similar law, or any
dissolution, winding up or liquidation proceeding, in respect of either Borrower
or any of its Material Subsidiaries, and, if any such case or proceeding is not
commenced by either Borrower or such Material Subsidiary, such case or
proceeding shall be consented to or acquiesced in by either Borrower or such
Material Subsidiary or shall result in the entry of an order for relief or shall
remain for 60 days undismissed; or (e) take any corporate action authorizing, or
in furtherance of, any of the foregoing.

    SECTION 8.2.  Action if Bankruptcy.  If any Event of Default described 
                  --------------------
in clauses (a) through (d) of Section 8.1.9 with respect to either Borrower 
                       ---    -------
shall occur, the Commitments (if not 

                                      -36-
<PAGE>
 
theretofore terminated) shall automatically terminate and the outstanding
principal amount of all outstanding Loans and all other Obligations shall
automatically be and become immediately due and payable, without notice or
demand.

    SECTION 8.3.  Action if Other Event of Default.
                  --------------------------------
    (a)  If any Event of Default described in Section 8.1.8 shall occur for any
                                              -------------                    
reason, whether voluntary or involuntary, and be continuing, unless such Event
of Default shall be waived in writing by all the Lenders within 10 days after
the occurrence of such Event of Default, the Administrative Agent, shall by
notice to the Borrowers declare all of the outstanding principal amount of the
Loans and other Obligations to be due and payable and the Commitments (if not
theretofore terminated) to be terminated, whereupon the full unpaid amount of
the Loans and other Obligations shall be and become immediately due and payable,
without further notice, demand or presentment, and the Commitments shall
terminate.

    (b)  If any Event of Default (other than any Event of Default described in
                                                                              
Section 8.1.8 or clauses (a) through (d) of Section 8.1.9 with respect to either
- -------------    -----------         ---    -------------                       
Borrower) shall occur for any reason, whether voluntary or involuntary, and be
continuing, the Administrative Agent, upon the direction of the Required
Lenders, shall by notice to the Borrowers declare all or any portion of the
outstanding principal amount of the Loans and other Obligations to be due and
payable and/or the Commitments (if not theretofore terminated) to be terminated,
whereupon the full unpaid amount of such Loans and other Obligations which shall
be so declared due and payable shall be and become immediately due and payable,
without further notice, demand or presentment, and/or, as the case may be, the
Commitments shall terminate.


                                  ARTICLE IX

                                  THE AGENTS
 

    SECTION 9.1.  Actions.  Each Lender hereby appoints Citibank 
                  -------
as the Documentation Agent, FNBC as the Co-Agent and BNS as the Arranger and as
its Administrative Agent under and for purposes of each Loan Document. Each
Lender authorizes the Administrative Agent to act on behalf of such Lender under
each Loan Document and, in the absence of other written instructions from the
Required Lenders received from time to time by the Administrative Agent (with
respect to which the Administrative Agent agrees that it will comply, except as
otherwise provided in this Section or as otherwise advised by counsel), to
exercise such powers hereunder and thereunder as are specifically delegated to
or required of the Administrative Agent by the terms hereof and

                                      -37-
<PAGE>
 
thereof, together with such powers as may be reasonably incidental thereto. Each
Lender hereby indemnifies (which indemnity shall survive any termination of this
Agreement) the Administrative Agent, pro rata according to such Lender's
                                     --- ----
Percentage, from and against any and all liabilities, obligations, losses,
damages, claims, costs or expenses of any kind or nature whatsoever which may at
any time be imposed on, incurred by, or asserted against, the Administrative
Agent in any way relating to or arising out of any Loan Document, including
reasonable attorneys' fees, and as to which the Administrative Agent is not
reimbursed by either Borrower; provided, however, that no Lender shall be liable
                               --------  -------
for the payment of any portion of such liabilities, obligations, losses,
damages, claims, costs or expenses which are determined by a court of competent
jurisdiction in a final proceeding to have resulted solely from the
Administrative Agent's gross negligence or willful misconduct. The
Administrative Agent shall not be required to take any action hereunder, under
any Loan Document, or to prosecute or defend any suit in respect of any Loan
Document, unless it is indemnified hereunder to its satisfaction. If any
indemnity in favor of the Administrative Agent shall be or become, in the
Administrative Agent's determination, inadequate, the Administrative Agent may
call for additional indemnification from the Lenders and cease to do the acts
indemnified against hereunder until such additional indemnity is given.
Citibank, N.A., as Documentation Agent, FNBC, as Co-Agent, and BNS, as Arranger,
shall not be required to take any action under this Agreement (it being
understood that the foregoing shall not prevent either the Documentation Agent,
the Co-Agent or the Arranger from engaging in any activity referred to in
Section 9.5).
- -----------  


    SECTION 9.2.  Funding Reliance, etc. Unless the Administrative Agent shall 
                  --------------------- 
have been notified by telephone, confirmed in writing, by any Lender by 5:00
p.m., New York City time, on the day prior to a Borrowing that such Lender will
not make available the amount which would constitute its Percentage of such
Borrowing on the date specified therefor, the Administrative Agent may assume
that such Lender has made such amount available to the Administrative Agent and,
in reliance upon such assumption, make available to either Borrower a
corresponding amount. If and to the extent that such Lender shall not have made
such amount available to the Administrative Agent, such Lender and the Borrowers
severally agree to repay the Administrative Agent forthwith on demand such
corresponding amount together with interest thereon, for each day from the date
the Administrative Agent made such amount available to the applicable Borrower
to the date such amount is repaid to the Administrative Agent, at the interest
rate applicable at the time to Loans comprising such Borrowing.

                                      -38-
<PAGE>
 
    SECTION 9.3.  Exculpation.  No Agent or any director, officer, employee 
                  -----------
or agent of any Agent shall be liable to any Lender for any action taken or
omitted to be taken by it under any Loan Document, or in connection herewith
or therewith, except for its own willful misconduct or gross negligence, nor
responsible for any recitals or warranties herein or therein, nor for the
effectiveness, enforceability, validity or due execution of any Loan Document,
nor to make any inquiry respecting the performance by either Borrower of its
obligations under any Loan Document. Any such inquiry which may be made by any
Agent shall not obligate it to make any further inquiry or to take any action.
Each Agent shall be entitled to rely upon advice of counsel concerning legal
matters and upon any notice, consent, certificate, statement or writing which
any Agent believes to be genuine and to have been presented by a proper Person.


    SECTION 9.4.  Successor.  The Administrative Agent may resign as such 
                  ---------
at any time upon at least 30 days' prior notice to the Borrowers and all
Lenders, such resignation to become effective only upon the effectiveness of the
appointment of a successor Administrative Agent. If the Administrative Agent at
any time shall resign, the Required Lenders may appoint another Lender as a
successor Administrative Agent which shall thereupon become the Administrative
Agent hereunder. If no successor Administrative Agent shall have been so
appointed by the Required Lenders, and shall have accepted such appointment,
within 30 days after the retiring Administrative Agent's giving notice of
resignation, then the retiring Administrative Agent may, on behalf of the
Lenders, appoint a successor Administrative Agent, which shall be one of the
Lenders or a commercial banking institution organized under the laws of the U.S.
(or any State thereof) or a U.S. branch or agency of a commercial banking
institution, and having a combined capital and surplus of at least $500,000,000.
Upon the acceptance of any appointment as Administrative Agent hereunder by a
successor Administrative Agent, such successor Administrative Agent shall be
entitled to receive from the retiring Administrative Agent such documents of
transfer and assignment as such successor Administrative Agent may reasonably
request, and shall thereupon succeed to and become vested with all rights,
powers, privileges and duties of the retiring Administrative Agent, and the
retiring Administrative Agent shall be discharged from its duties and
obligations under this Agreement. After any retiring Administrative Agent's
resignation hereunder as the Administrative Agent, the provisions of this
Article IX shall inure to its benefit as to any actions taken or omitted to 
- ----------                                     
be taken by it while it was the Administrative Agent under this Agreement, and
Section 10.3 and Section 10.4 shall continue to inure to its benefit.
- ------------     ------------                        

    SECTION 9.5.  Loans by an Agent.  Each Agent, in its individual or 
                  -----------------
other capacity, shall have the same rights and 

                                      -39-
<PAGE>
 
powers with respect to (x) the Loans made by it or any of its affiliates, and
(y) the Notes held by it or any of its affiliates as any other Lender and may
exercise the same as if it were not an Agent. Each Agent, in its individual or
other capacity, and their respective affiliates may accept deposits from, lend
money to, and generally engage in any kind of business with the Borrowers or any
Subsidiary or affiliate of either Borrower as if it were not an Agent hereunder.

    SECTION 9.6.  Credit Decisions.  Each Lender acknowledges that it has, 
                  ----------------
independently of each Agent and each other Lender, and based on such Lender's
review of the financial information of the Borrowers, the Loan Documents (the
terms and provisions of which being satisfactory to such Lender) and such other
documents, information and investigations as such Lender has deemed appropriate,
made its own credit decision to extend its Commitment. Each Lender also
acknowledges that it will, independently of any Agent and each other Lender, and
based on such other documents, information and investigations as it shall deem
appropriate at any time, continue to make its own credit decisions as to
exercising or not exercising from time to time any rights and privileges
available to it under any Loan Document.


    SECTION 9.7.  Copies, etc. The Administrative Agent shall give 
                  ----------- 
prompt notice to each Lender of each notice or request required or permitted to
be given to the Administrative Agent by either Borrower pursuant to the terms of
this Agreement (unless concurrently delivered to the Lenders by either
Borrower). The Administrative Agent will distribute to each Lender each document
or instrument received for its account and copies of all other communications
received by the Administrative Agent from either Borrower for distribution to
the Lenders by the Administrative Agent in accordance with the terms of this
Agreement.


                                 ARTICLE X

                           MISCELLANEOUS PROVISIONS
 

    SECTION 10.1.  Waivers, Amendments, etc. The provisions of this Agreement
                   ------------------------ 
and of each other Loan Document may from time to time be amended, modified or
waived, if such amendment, modification or waiver is in writing and consented to
by the Borrowers and the Required Lenders; provided, however, that no such 
                                           --------  ------- 
amendment, modification or waiver which would: (a) modify any requirement
hereunder that any particular action be taken by all the Lenders or by the
Required Lenders shall be effective unless consented to by each Lender; (b)
modify this Section 10.1, change the definition of "Required Lenders", 
            ------------                            ---------------
increase the Commitment Amount or (except pursuant to a Lender Assignment

                                      -40-
<PAGE>
 
Agreement) the Percentage of any Lender, reduce any fees described in
Article III, or (except as provided in Section 2.7) extend the Commitment
- -----------                            -----------                       
Termination Date shall be made without the consent of each Lender; (c) extend
the due date for, or reduce the amount of, any scheduled repayment or prepayment
of principal of or interest on any Loan (or reduce the principal amount of or
rate of interest on any Loan) shall be made without the consent of the Lender to
which such Loan relates (and if applicable, each other Permitted Noteholder to
which such Loan relates); or (d) affect adversely the interests, rights or
obligations of any Agent qua such Agent shall be made without consent of such
                         ---     
Agent. No failure or delay on the part of any Agent, any Lender or the holder of
any Note in exercising any power or right under any Loan Document shall operate
as a waiver thereof, nor shall any single or partial exercise of any such power
or right preclude any other or further exercise thereof or the exercise of any
other power or right. No notice to or demand on either Borrower in any case
shall entitle it to any notice or demand in similar or other circumstances. No
waiver or approval by any Agent, any Lender or the holder of any Note under any
Loan Document shall, except as may be otherwise stated in such waiver or
approval, be applicable to subsequent transactions. No waiver or approval
hereunder shall require any similar or dissimilar waiver or approval thereafter
to be granted hereunder.

    SECTION 10.2. Notices . All notices and other communications provided to any
                  -------
party hereto under any Loan Document shall be in writing or by telex or by
facsimile and addressed, delivered or transmitted to such party at its address,
telex or facsimile number set forth below its signature hereto or set forth in
the Lender Assignment Agreement or at such other address, telex or facsimile
number as may be designated by such party in a notice to the other parties. Any
notice, if mailed and properly addressed with postage prepaid or if properly
addressed and sent by pre-paid courier service, shall be deemed given when
received; any notice, if transmitted by telex or facsimile, shall be deemed
given when transmitted (answerback confirmed in the case of telexes).


    SECTION 10.3. Payment of Costs and Expenses . Each Borrower agrees to pay on
                  -----------------------------
demand all reasonable expenses of the Administrative Agent (including the
reasonable fees and out-of-pocket expenses of counsel to the Administrative
Agent and of local counsel, if any, who may be retained by counsel to the
Administrative Agent) in connection with: (a) the negotiation, preparation,
execution and delivery of each Loan Document, including schedules and exhibits,
and any amendments, waivers, consents, supplements or other modifications to any
Loan Document as may from time to time hereafter be required, whether or not the
transactions contemplated hereby are consummated, and (b) the preparation and
review of the form of any document or instrument

                                      -41-
<PAGE>
 
relevant to any Loan Document. Each Borrower further agrees to pay, and to save
the Agents and the Lenders harmless from all liability for, any stamp or other
taxes (except as provided in Section 4.6) which may be payable in connection
                             -----------
with the execution or delivery of this Agreement, the borrowings hereunder, or
the issuance of the Notes or any other Loan Documents. Each Borrower also agrees
to reimburse the Administrative Agent and each Lender upon demand for all
reasonable out-of-pocket expenses (including reasonable attorneys' fees and
legal expenses) incurred by the Administrative Agent and each Lender in
connection with (x) the negotiation of any restructuring or "work-out", whether
or not consummated, of any Obligations and (y) the enforcement of any
Obligations.

    SECTION 10.4.  Indemnification.  In consideration of the execution and 
                   ---------------
delivery of this Agreement by each Lender and the extension of the Commitments,
each Borrower hereby indemnifies, exonerates and holds each Agent and each
Lender and each of their respective officers, directors, employees and agents
(collectively, the "Indemnified Parties") free and harmless from and against any
                    -------------------  
and all actions, causes of action, suits, losses, costs, liabilities and
damages, and reasonable expenses incurred in connection therewith (irrespective
of whether any such Indemnified Party is a party to the action for which
indemnification hereunder is sought), including reasonable attorneys' fees and
disbursements (collectively, the "Indemnified Liabilities"), incurred by the 
                                  ------------------------ 
Indemnified Parties or any of them as a result of, or arising out of, or
relating to: (a) any transaction financed or to be financed in whole or in part,
directly or indirectly, with the proceeds of any Loan, or (b) the entering into
and performance of any Loan Document by any of the Indemnified Parties
(including any action brought by or on behalf of either Borrower as the result
of any determination by the Required Lenders pursuant to Article V not to fund
                                                         --------- 
any Borrowing), except in each case, for any such Indemnified Liabilities
arising for the account of a particular Indemnified Party by reason of the
relevant Indemnified Party's gross negligence or wilful misconduct, as
determined by a court of competent jurisdiction in a final and non-appealable
judgment. If and to the extent that the foregoing undertaking may be
unenforceable for any reason, each Borrower hereby agrees to make the maximum
contribution to the payment and satisfaction of each of the Indemnified
Liabilities which is permissible under applicable law.

    SECTION 10.5.  Survival.  The obligations of each Borrower under 
                   --------
Sections 4.6, 10.3 and 10.4, and the obligations of the Lenders under Section 
- ------------  ----     ----                                           -------
9.1, shall in each case survive any termination of this Agreement, the payment
- ---                              
in full of all Obligations and the termination of all Commitments. The

                                      -42-
<PAGE>
 
representations and warranties made by either Borrower in this Agreement shall
survive the execution and delivery of each Loan Document.

    SECTION 10.6.  Severability.  Any provision of any Loan Document which 
                   ------------
is prohibited or unenforceable in any jurisdiction shall, as to such provision
and such jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions of such Loan
Document or affecting the validity or enforceability of such provision in any
other jurisdiction.

    SECTION 10.7.  Headings.  The various headings of this Agreement 
                   --------
are inserted for convenience only and shall not affect the meaning or
interpretation of this Agreement or any provisions hereof.

    SECTION 10.8.  Execution in Counterparts, Effectiveness, etc.
                   --------------------------------------------- 
This Agreement may be executed by the parties hereto in several counterparts,
each of which shall be executed by the Borrowers, the Lenders and the Agents and
be deemed to be an original and all of which shall constitute together but one
and the same agreement. This Agreement shall become effective when counterparts
hereof executed on behalf of the Borrowers, each Lender and each Agent (or
notice thereof satisfactory to the Administrative Agent) shall have been
received by the Administrative Agent and notice thereof shall have been given by
the Administrative Agent to the Borrowers, each Lender and the other Agents.

    SECTION 10.9.  Governing Law; Entire Agreement.  THIS AGREEMENT AND THE 
                   -------------------------------
NOTES SHALL EACH BE DEEMED TO BE A CONTRACT MADE UNDER AND GOVERNED BY THE LAWS
OF THE STATE OF NEW YORK. This Agreement and the Notes constitute the entire
understanding among the parties hereto with respect to the subject matter hereof
and supersede any prior agreements, written or oral, with respect thereto.

    SECTION 10.10.  Successors and Assigns.  This Agreement shall be 
                    ----------------------
binding upon and shall inure to the benefit of the parties hereto and their
respective successors and assigns; provided, however, that: (a) neither 
                                   --------  -------
Borrower may assign or transfer its rights or obligations hereunder without the
prior written consent of the Administrative Agent and all Lenders; and (b) the
rights of sale, assignment and transfer of the Lenders are subject to 
Section 10.11.
- ------------- 

    SECTION 10.11.  Assignments; Participations.  Each Lender may assign, 
                    ---------------------------
or sell participations in, its Loans and Commitment to one or more other Persons
in accordance with this Section 10.11.
                        -------------

                                      -43-
<PAGE>
 
    SECTION 10.11.1.  Assignments.  Any Lender may at any time, with 
                      -----------
the consent of each Borrower (which consent shall not be unreasonably withheld),
assign and delegate to one or more commercial lending institutions (each Person
to whom such assignment and delegation is to be made, being hereinafter referred
to as an "Assignee Lender") with a short term unsecured debt or uninsured
          ---------------  
certificate of deposit rating at the time of such assignment of at least A (or
the equivalent) from each of Moody's and S&P, all or any fraction of such
Lender's total Loans and Commitment (which assignment and delegation shall be of
a constant, and not a varying, percentage of all the assigning Lender's Loans
and Commitment) in a minimum aggregate amount of $5,000,000; provided, however,
                                                             --------  -------
that any such Assignee Lender will comply, if applicable, with the provisions
contained in the last paragraph of Section 4.6 and further, provided, however,
                                   -----------     -------  --------  -------
that, the Borrowers and the Administrative Agent shall be entitled to continue
to deal solely and directly with such Lender in connection with the interests so
assigned and delegated to an Assignee Lender until (a) written notice of such
assignment and delegation, together with payment instructions, addresses and
related information with respect to such Assignee Lender, shall have been given
to the Borrowers and the Administrative Agent by such Lender and such Assignee
Lender; (b) such Assignee Lender shall have executed and delivered to the
Borrowers and the Administrative Agent a Lender Assignment Agreement, accepted
by the Administrative Agent and the Borrowers; and (c) the processing fees
described below shall have been paid. From and after the date that the
Administrative Agent and the Borrowers accept such Lender Assignment Agreement,
(x) the Assignee Lender thereunder shall be deemed automatically to have become
a party hereto and to the extent that rights and obligations hereunder have been
assigned and delegated to such Assignee Lender in connection with such Lender
Assignment Agreement, shall have the rights and obligations of a Lender
hereunder and under the other Loan Documents, and (y) the assignor Lender, to
the extent that rights and obligations hereunder have been assigned and
delegated by it in connection with such Lender Assignment Agreement, shall
relinquish its rights and shall be released from its obligations hereunder and
under the other Loan Documents. Within five Business Days after its receipt of
notice that the Administrative Agent has received an executed Lender Assignment
Agreement, the Borrowers shall execute and deliver to the Administrative Agent
(for delivery to the relevant Assignee Lender) new Notes evidencing such
Assignee Lender's assigned Loans and Commitment and, if the assignor Lender has
retained Loans and a Commitment hereunder, replacement Notes in the principal
amount of the Loans and Commitment retained by the assignor Lender hereunder
(each such Note to be in exchange for, but not in payment of, that Note then
held by such assignor Lender). Each such Note shall be dated the date of the
predecessor Note. The assignor Lender shall mark the predecessor Note
"exchanged" and deliver it to the 

                                      -44-
<PAGE>
 
applicable Borrower. Accrued interest on that part of the predecessor Note
evidenced by the new Note, and accrued fees, shall be allocated as provided in
the Lender Assignment Agreement. Accrued interest on that part of the
predecessor Note evidenced by the replacement Note shall be paid to the assignor
Lender. Accrued interest and accrued fees shall be paid at the same time or
times provided in the predecessor Note and in this Agreement. Such assignor
Lender or such Assignee Lender must also pay a processing fee to the
Administrative Agent upon delivery of any Lender Assignment Agreement in the
amount of $3,500 (which may be waived in whole or in part by the Administrative
Agent). Any attempted assignment and delegation not made in accordance with this
Section 10.11.1 shall be null and void.
- ---------------                  


    SECTION 10.11.2.  Participations.  Any Lender may at any time sell 
                      --------------
to one or more commercial banks or other Persons (each of such commercial banks
and other Persons being herein called a "Participant") participating interests 
                                         ------------
in any of the Loans, its Commitment, or other interests of such Lender
hereunder; provided, however, that (a) such Lender shall remain solely
           --------  -------               
responsible for the performance of its Commitment and its other obligations
hereunder; (b) the Borrowers and the Agents shall continue to deal solely and
directly with such Lender in connection with such Lender's rights and
obligations under each Loan Document; and (c) neither Borrower shall be required
to pay any amount under this Agreement that is greater than the amount which it
would have been required to pay had no participating interest been sold.

    SECTION 10.11.3.  Confidential Information.  Any Lender may, in connection
                      ------------------------
with any assignment or participation or proposed assignment or participation
pursuant to Section 10.11.1 or 10.11.2, disclose to the Assignee Lender or
            ------- -------    ------- 
Participant or the proposed Assignee Lender or Participant, any information
relating to the Borrowers furnished to such Lender hereunder, provided that
                                                              --------
prior to any such disclosure, the Assignee Lender or Participant or the proposed
Assignee Lender or Participant, as the case may be, shall agree to preserve the
confidentiality of any confidential information relating to the Borrowers
received by it from such Lender. For the purposes hereof, the following
information shall not be considered to be confidential: (i) information which
becomes generally available to the public other than as a result of a disclosure
by such Lender, and (ii) information which becomes available to such Lender on a
non-confidential basis from a source other than the Borrowers provided that such
source is not bound by a confidentiality agreement with the Borrowers.

    SECTION 10.11.4.  Federal Reserve Bank Advances.  Nothing in this Section
                      -----------------------------                   -------
10.11 or this Agreement shall prevent or prohibit
- -----

                                      -45-
<PAGE>
 
any Lender from pledging its rights (but not its obligations to make Loans)
under this Agreement and/or its Loans and/or Notes hereunder to a Federal
Reserve Bank in support of borrowings made by such Lender from such Federal
Reserve Bank. Such pledge may be made without notice to, or the consent of, the
Agents or either Borrower.


    SECTION 10.12.  Other Transactions.  Nothing contained herein shall 
                    ------------------
preclude any Agent or any Lender from engaging in any transaction, in addition
to those contemplated by any Loan Document, with either Borrower or any of its
affiliates in which either Borrower or such affiliate is not restricted hereby
from engaging with any other Person.


    SECTION 10.13.  Forum Selection and Consent to Jurisdiction.  ANY 
                    -------------------------------------------
LITIGATION BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION
WITH, THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY COURSE OF CONDUCT,
COURSE OF DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY
PARTY HERETO MAY BE BROUGHT AND MAINTAINED NON-EXCLUS4ELY IN THE COURTS OF THE
STATE OF NEW YORK OR IN THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN
DISTRICT OF NEW YORK.  EACH PARTY HERETO HEREBY EXPRESSLY AND IRREVOCABLY
SUBMITS TO THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK AND OF THE
UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW YORK FOR THE
PURPOSE OF ANY SUCH LITIGATION AS SET FORTH ABOVE AND IRREVOCABLY AGREES TO BE
BOUND BY ANY FINAL, NON-APPEALABLE JUDGMENT RENDERED THEREBY IN CONNECTION WITH
SUCH LITIGATION.  EACH PARTY HERETO FURTHER IRREVOCABLY CONSENTS TO THE SERVICE
OF PROCESS BY REGISTERED MAIL, POSTAGE PREPAID, OR BY PERSONAL SERVICE WITHIN OR
WITHOUT THE STATE OF NEW YORK.  EACH PARTY HERETO HEREBY EXPRESSLY AND
IRREVOCABLY WA4ES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION WHICH
IT MAY HAVE OR HEREAFTER MAY HAVE TO THE LAYING OF VENUE OF ANY SUCH LITIGATION
BROUGHT IN ANY SUCH COURT REFERRED TO ABOVE AND ANY CLAIM THAT ANY SUCH
LITIGATION HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.  TO THE EXTENT THAT ANY
PARTY HERETO HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY FROM JURISDICTION OF ANY
COURT OF FROM ANY LEGAL PROCESS (WHETHER THROUGH SERVICE OR NOTICE, ATTACHMENT
PRIOR TO JUDGMENT, ATTACHMENT IN AID OF EXECUTION OR OTHERWISE) WITH RESPECT TO
ITSELF OR ITS PROPERTY, SUCH PARTY HEREBY IRREVOCABLY WA4ES SUCH IMMUNITY IN
RESPECT OF ITS OBLIGATIONS UNDER THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS.


    SECTION 10.14.  Waiver of Jury Trial.  EACH AGENT, THE LENDERS AND EACH 
                    --------------------
BORROWER HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHTS THEY
MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR
ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS AGREEMENT OR ANY OTHER LOAN
DOCUMENT, OR ANY COURSE OF CONDUCT, COURSE OF DEALING, STATEMENTS (WHETHER
VERBAL OR WRITTEN) OR ACTIONS OF SUCH AGENT, THE LENDERS

                                      -46-
<PAGE>
 
OR EITHER BORROWER.  EACH BORROWER ACKNOWLEDGES AND AGREES THAT IT HAS
RECEIVED FULL AND SUFFICIENT CONSIDERATION FOR THIS PROVISION (AND EACH OTHER
PROVISION OF EACH OTHER LOAN DOCUMENT TO WHICH IT IS A PARTY) AND THAT THIS
PROVISION IS A MATERIAL INDUCEMENT FOR EACH AGENT AND THE LENDERS ENTERING INTO
THIS AGREEMENT AND EACH SUCH OTHER LOAN DOCUMENT.



                    [REST OF PAGE LEFT INTENTIONALLY BLANK]

                                      -47-
<PAGE>
 
    IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.


                           AMBAC FINANCIAL GROUP, INC.



                           By: /s/ Frank J. Bivona
                               -------------------------------
                               Name:  Frank J. Bivona
                               Title: Executive Vice President
                                      and Chief Financial Officer

                           Address:   One State Street Plaza
                                      New York, New York  10004

                           Facsimile No.:  (212) 509-9190

                           Attention:  Frank J. Bivona
                                       Executive Vice President and
                                       Chief Financial Officer

                                       Joseph V. Salzano
                                       Executive Vice President and
                                       General Counsel



                           AMBAC ASSURANCE CORPORATION


                           By: /s/ Frank J. Bivona
                               ---------------------------------
                               Name:   Frank J. Bivona
                               Title:  Executive Vice President
                                       and Chief Financial Officer

                           Address:  One State Street Plaza
                                     New York, New York  10004

                           Facsimile No.:  (212) 509-9190


                           Attention:  Frank J. Bivona
                                       Executive Vice President
                                       and Chief Financial Officer

                           Attention:  Stephen D. Cooke
                                       Senior Vice President and
                                       General Counsel

                                      -48-
<PAGE>
 
                           THE BANK OF NOVA SCOTIA,
                             acting through its New York Agency,
                             as Arranger and Administrative Agent


                           By: /s/ J. Alan Edwards 
                               -----------------------------
                               Name:   J. Alan Edwards
                               Title:  Vice President

                           Address:  One Liberty Plaza
                                     New York, New York  10006

                           Facsimile No.:  (212) 225-5145

                           Attention:  Ms. Tilsa Cora
                                       Loan Administration Group



                           CITIBANK, N.A., as Documentation Agent



                           By: /s/ Laughton Sherman 
                               ------------------------------
                               Name:   Laughton Sherman
                               Title:  Attorney-in-Fact

                           Address:  399 Park Avenue
                                     New York, New York  10043

                           Facsimile No.:  (212) 935-4285

                           Attention:  Laughton Sherman
                                       Financial Institutions -
                                       North America

                                      -49-
<PAGE>
 
                           THE FIRST NATIONAL BANK OF CHICAGO,
                              as Co-Agent



                           By: /s/ Samuel W. Bridges
                               ---------------------------------
                               Name:     Samuel W. Bridges
                               Title:    First Vice President


                           Address:   153 W. 51st Street
                                      New York, New York 10019

                           Facsimile No.: (212) 373-1439

                           Attention: Mr. Samuel W. Bridges

                                      -50-
<PAGE>
 
PERCENTAGE                              LENDERS
- ----------                              -------

   33-1/3%                   THE BANK OF NOVA SCOTIA


                             By:  /s/ J. Alan Edwards
                                 --------------------
                                 Name:   J. Alan Edwards
                                 Title:  Vice President

                             Domestic
                             Office:  One Liberty Plaza
                                      New York, New York  10006

                             Facsimile No.:  (212) 225-5145

                             Attention:  Ms. Tilsa Cora
                                         Loan Administration Group
                             LIBOR
                             Office:  One Liberty Plaza
                                      New York, New York  10006


                             Facsimile No.:  (212) 225-5145

                             Attention:  Ms. Tilsa Cora
                                         Loan Administration Group

                                      -51-
<PAGE>
 
PERCENTAGE                      LENDERS
- ----------                      -------

   33-1/3%                  CITIBANK, N.A.



                            By:   /s/ Laughton Sherman
                                  ----------------------
                                  Name:   Laughton Sherman
                                  Title:  Attorney-in-Fact


                                 Domestic
                                 Office:  399 Park Avenue
                                          New York, New York  10043


                                 Facsimile No.:  (212) 935-4285


                                 Attention:  Laughton Sherman
                                             Financial Institutions -
                                                North America


                                 LIBOR
                                 Office:  399 Park Avenue
                                          New York, New York  10043

                                 Facsimile No.:  (212) 935-4285


                                 Attention:  Laughton Sherman
                                             Financial Institutions -
                                                North America

                                      -52-
<PAGE>
 
PERCENTAGE                              LENDERS
- ----------                              -------

  33-1/3%                  THE FIRST NATIONAL BANK OF CHICAGO


                           By:   /s/ Samuel W. Bridges
                                 -----------------------------
                                 Name:   Samuel W. Bridges
                                 Title:  First Vice President


                                 Domestic
                                 Office: 153 W. 51st Street
                                         New York, New York 10019


                                 Facsimile No.: (212) 373-1439


                                 Attention: Mr. Samuel W. Bridges


                                 LIBOR
                                 Office:

                                 Facsimile No.:

                                 Attention:

                                      -53-
<PAGE>
 
                                                            SCHEDULE I



                              DISCLOSURE SCHEDULE
                              -------------------



ITEM 6.7  Litigation.
          ---------- 

      None.

ITEM 6.9  Employee Benefit Plans.
          ---------------------- 

      1.  Pursuant to the acquisition of Connie Lee, the Borrowers have
initiated a standard termination of the two Pension Plans sponsored by Connie
Lee in accordance with Section 4041 of ERISA.

      2.  Post-retirement health and life insurance benefits provided under
Ambac Financial Health and Welfare Plan.

ITEM 7.2.1.(b)  Ongoing Liens.
                ------------- 

      Ambac Financial Group, Inc.
      ---------------------------

               [None.]

      Ambac Assurance Corporation
      ---------------------------

               None.

                                      -54-
<PAGE>
 
                                                            EXHIBIT A



                                 NOTE

$________                                             ___________, 19___


     FOR VALUE RECEIVED, the undersigned, [AMBAC FINANCIAL GROUP, INC.] [AMBAC
ASSURANCE CORPORATION], a [Delaware] [Wisconsin stock insurance] corporation
(the "Borrower"), promises to pay to the order of _________________ (the
      --------                                                          
"Lender") on _______, ____ (or if later, the Stated Maturity Date (as defined in
 ------                                                                         
the Credit Agreement referred to below) the principal sum of _______________
DOLLARS ($___________) or, if less, the aggregate unpaid principal amount of all
Loans made by the Lender to the Borrower pursuant to that certain Credit
Agreement, dated as of August 3, 1998 (together with all amendments and other
modifications, if any, from time to time thereafter made thereto, the "Credit
                                                                       ------
Agreement"), among Ambac Financial Group, Inc., Ambac Assurance Corporation, The
- ---------                                                                       
Bank of Nova Scotia, acting through its New York Agency, as Administrative
Agent, Citibank, N.A., as Documentation Agent (BNS and Citibank, in such
capacity individually referred to as an "Agent" and collectively referred to as
                                         -----                                 
the "Agents"), and the various commercial lending institutions (including the
     ------                                                                  
Lender) as are, or may from time to time become, parties thereto.

     The Borrower also promises to pay interest on the unpaid principal amount
hereof from time to time outstanding from the date hereof until maturity
(whether by acceleration or otherwise) and, after maturity, until paid, at the
rates per annum and on the dates specified in the Credit Agreement.

     Payments of both principal and interest are to be made in lawful money of
the United States of America in same day or immediately available funds to the
account designated by the Administrative Agent pursuant to the Credit Agreement.

     This Note is a Note referred to in, and evidences Indebtedness incurred
under, the Credit Agreement, to which reference is made for a statement of the
terms and conditions on which the Borrower is permitted and required to make
repayments of principal of the Indebtedness evidenced by this Note and on which
such Indebtedness may be declared to be immediately due and payable.  Unless
otherwise defined, terms used herein have the meanings provided in the Credit
Agreement.
<PAGE>
 
     This Note is transferable only in accordance with the Credit Agreement.

     All parties hereto, whether as makers, endorsers, or otherwise, severally
waive presentment for payment, demand, protest and notice of dishonor.

     THIS NOTE HAS BEEN DELIVERED IN NEW YORK, NEW YORK AND SHALL BE DEEMED TO
BE A CONTRACT MADE UNDER AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

                                  [AMBAC FINANCIAL GROUP, INC.]   
                                  [AMBAC ASSURANCE CORPORATION]


                                  By:____________________________
                                     Title:








                                      -2-
<PAGE>
 
                         LOANS AND PRINCIPAL PAYMENTS


<TABLE>
<CAPTION>
 
 
                                                                          Unpaid                           
            Amount of                               Amount of            Principal                          
            Loan Made                             Principal Repaid        Balance                   Nota-        
          -------------                           ----------------     -------------                tion    
          Base     LIBO      Interest Period      Base       LIBO      Base      LIBO               Made    
  Date    Rate     Rate      (if applicable)      Rate       Rate      Rate      Rate     Total      By    
==============================================================================================================
<S>     <C>     <C>        <C>                  <C>       <C>        <C>       <C>      <C>        <C> 

- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
</TABLE>



                                      -3-
<PAGE>
 
                                                            EXHIBIT B


                                 BORROWING REQUEST



The Bank of Nova Scotia,
  New York Agency,
  as Administrative Agent
One Liberty Plaza
New York, New York  10006

Attention:  Ms. Tilsa Cora
            Loan Administration Group

                    Ambac Financial Group, Inc.
                    Ambac Assurance Corporation
                    ---------------------------

Gentlemen and Ladies:

     This Borrowing Request is delivered to you pursuant to Section 2.3 of the
Credit Agreement, dated as of August 3, 1998 (together with all amendments and
other modification, if any, from time to time made thereto, the "Credit
                                                                 ------
Agreement"),among Ambac Financial Group, Inc., Ambac Assurance Corporation,
- ---------                                                                  
certain commercial lending institutions, The Bank of Nova Scotia ("BNS"), acting
                                                                   ---          
through its New York Agency, as Arranger and Administrative Agent (the
                                                                      
"Administrative Agent"), and Citibank, N.A., as Documentation Agent, and the
- ---------------------                                                       
First National Bank of Chicago ("FNBC"), as Co-Agent (BNS, Citibank, and FNBC,
                                 ----                                         
in such capacity individually referred to as an "Agent" and collectively
                                                 -----                  
referred to as the "Agents").  Unless otherwise defined herein or the context
                    ------                                                   
otherwise requires, terms used herein have the meanings provided in the Credit
Agreement.

     [Ambac Financial Group, Inc.] [Ambac Assurance Corporation] (the
                                                                     
"Borrower") hereby requests that Loans be made to it in the aggregate principal
 --------                                                                      
amount of $__________ on __________, 19___ as [LIBO Rate Loans having an
Interest Period of _______ months] [Base Rate Loans].

     The Borrower hereby acknowledges that, pursuant to Section 5.2.2 of the
                                                        -------------       
Credit Agreement, each of the delivery of this Borrowing Request and the
acceptance by the Borrower of the proceeds of the Loans requested hereby
constitute a representation and warranty by the Borrower that, on the date of
such Loans, and before and after giving effect thereto and to the application of
the proceeds therefrom, all statements set forth in Section 5.2.1 are true and
                                                    -------------             
correct in all material respects.

     The Borrower agrees that if prior to the time of the Borrowing requested
hereby any matter certified to herein by it
<PAGE>
 
will not be true and correct at such time as if then made, it will immediately
so notify the Administrative Agent.  Except to the extent, if any, that prior to
the time of the Borrowing requested hereby the Administrative Agent shall
receive written notice to the contrary from the Borrower, each matter certified
to herein shall be deemed once again to be certified as true and correct at the
date of such Borrowing as if then made.

     Please wire transfer the proceeds of the Borrowing to the accounts of the
following persons at the financial institutions indicated respectively:


Amount to be            Person to be Paid         Name, Address, etc.
                    --------------------------                     
Transferred         Name           Account No.        of Institution
- -----------         ----           -----------    -------------------

$___________        ____________   __________     ____________________
                                                  --------------------
                                                  Attention: _________

$___________        ____________   ___________    ____________________
                                                  --------------------
                                                  Attention: _________

Balance of          The Borrower   ___________    ____________________
such proceeds                                     ____________________
                                                  Attention: _________


     The Borrower has caused this Borrowing Request to be executed and
delivered, and the certification and warranties contained herein to be made, by
its duly Authorized Officer this ___ day of ___________, 19___.

                                [AMBAC FINANCIAL GROUP, INC.]   
                                [AMBAC ASSURANCE CORPORATION]



                                By:______________________________
                                   Title:


                                      -2-
<PAGE>
 
                                                            EXHIBIT C



                        CONTINUATION/CONVERSION NOTICE



The Bank of Nova Scotia,
  New York Agency,
  as Administrative Agent
One Liberty Plaza
New York, New York 10006

Attention:  Ms. Tilsa Cora
            Loan Administration Group

                    Ambac Financial Group, Inc.
                    Ambac Assurance Corporation
                    ---------------------------

Gentlemen and Ladies:

     This Continuation/Conversion Notice is delivered to you pursuant to Section
2.4 of the Credit Agreement, dated as of August 3, 1998 (together with all
amendments and other modifications, if any, from time to time made thereto, the
"Credit Agreement" and other modifications),among Ambac Financial Group, Inc.,
 ----------------                                                             
Ambac Assurance Corporation, certain commercial lending institutions, The Bank
of Nova Scotia ("BNS"), acting through its New York Agency, as Arranger and
                 ---                                                       
Administrative Agent (the "Administrative Agent"), Citibank, N.A., as
                           --------------------                      
Documentation Agent, and the First National Bank of Chicago ("FNBC"), as Co-
                                                              ----         
Agent, (BNS, Citibank, and FNBC, in such capacity individually referred to as an
"Agent" and collectively referred to as the "Agents"). Unless otherwise defined
 -----                                       ------                            
herein or the context otherwise requires, terms used herein have the meanings
provided in the Credit Agreement.

     [Ambac Financial Group, Inc.] [Ambac Assurance Corporation] (the
                                                                     
"Borrower") hereby requests that on ____________, 19___,
 --------                                               

          (1) $___________ of the presently outstanding principal amount of the
     Loans originally made to it on __________, 19___ [and $__________ of the
     presently outstanding principal amount of the Loans to it originally made
     on __________, 19___],


          (2) and all presently being maintained as 1/[Base Rate Loans] [LIBO
                                                    -                        
     Rate Loans],

1/  Select appropriate interest rate option.
- -                                           
<PAGE>
 
          (3) be [converted into] [continued as],

          (4) 2/[LIBO Rate Loans having an Interest Period of ______ months]
              -                                                             
     [Base Rate Loans].

The Borrower hereby:

          (a) certifies and warrants that no Default has occurred and is
     continuing; and

          (b) agrees that if prior to the time of such continuation or
     conversion any matter certified to herein by it will not be true and
     correct at such time as if then made, it will immediately so notify the
     Administrative Agent.

Except to the extent, if any, that prior to the time of the continuation or
conversion requested hereby the Administrative Agent shall receive written
notice to the contrary from the Borrower, each matter certified to herein shall
be deemed to be certified at the date of such continuation or conversion as if
then made.

     The Borrower has caused this Continuation/Conversion Notice to be executed
and delivered, and the certification and warranties contained herein to be made,
by its Authorized Officer this ___ day of _________, 19___.

                         [AMBAC FINANCIAL GROUP, INC.]
                         [AMBAC ASSURANCE CORPORATION]


                         By:__________________________________
                            Title:



2/  Insert appropriate interest rate option.
- -                                           



                                      -2-
<PAGE>
 
                                                            EXHIBIT D



                          LENDER ASSIGNMENT AGREEMENT


To:  Ambac Financial Group, Inc.
     Ambac Assurance Corporation

     The Bank of Nova Scotia,
       New York Agency,
       as the Administrative Agent

                       Ambac Financial Group, Inc.
                       Ambac Assurance Corporation
                       ---------------------------

Gentlemen and Ladies:

     We refer to Section 10.11.1 of the Credit Agreement, dated as of August 3,
                 ---------------                                               
1998 (together with all amendments and other modifications, if any, from time to
time thereafter made thereto, the "Credit Agreement"), among Ambac Financial
                                   ----------------                         
Group, Inc., Ambac Assurance Corporation (the "Borrowers"), the various
                                               ---------               
commercial lending institutions (the "Lenders") as are, or shall from time to
                                      -------                                
time become, parties thereto, The Bank of Nova Scotia ("BNS"), acting through
                                                        ---                  
its New York Agency, as Arranger and Administrative Agent (the "Administrative
                                                                --------------
Agent") for the Lenders, Citibank, N.A., as Documentation Agent, and The First
- -----                                                                         
National Bank of Chicago ("FNBC"), as Co-Agent (BNS, Citibank, and FNBC, in such
                           ----                                                 
capacity individually referred to as an "Agent" and collectively referred to as
                                         -----                                 
the "Agents").  Unless otherwise defined herein or the context otherwise
     ------                                                             
requires, terms used herein have the meanings provided in the Credit Agreement.

     This agreement is delivered to you pursuant to Section 10.11.1 of the
                                                    ---------------       
Credit Agreement and also constitutes notice to each of you, pursuant to Section
                                                                         -------
10.11.1 of the Credit Agreement, of the assignment and delegation to
- -------                                                             
_______________ (the "Assignee") of ___% of all Loans held by, and the
                      --------                                        
Commitment of, _____________ (the "Assignor") outstanding under the Credit
                                   --------                               
Agreement on the date hereof.  After giving effect to the foregoing assignment
and delegation, the Assignor's and the Assignee's Percentages for the purposes
of the Credit Agreement are set forth opposite such Person's name on the
signature pages hereof.

     [Add paragraph dealing with accrued interest and fees with respect to Loans
assigned.]

     The Assignee hereby acknowledges and confirms that it has received a copy
of the Credit Agreement and the exhibits related thereto, together with copies
of the documents which were required to be delivered under the Credit Agreement
as a
<PAGE>
 
condition to the making of the Loans thereunder.  The Assignee further confirms
and agrees that in becoming a Lender and in making its Commitment and Loans
under the Credit Agreement, such actions have and will be made without recourse
to, or representation or warranty by the Administrative Agent.

     Except as otherwise provided in the Credit Agreement, effective as of the
date of acceptance hereof by the Administrative Agent and the Borrowers,

          (a)  the Assignee

               (i)  shall be deemed automatically to have become a party to the
          Credit Agreement, have all the rights and obligations of a "Lender"
          under the Credit Agreement and the other Loan Documents as if it were
          an original signatory thereto to the extent specified in the second
          paragraph hereof;

               (ii)  agrees to be bound by the terms and conditions set forth in
          the Credit Agreement and the other Loan Documents as if it were an
          original signatory thereto; and

          (b)  the Assignor shall relinquish its rights, and be released from
     its obligations, under the Credit Agreement and the other Loan Documents,
     in each case to the extent specified in the second [and third] paragraph[s]
     hereof.

     The Assignor and the Assignee hereby agree that the [Assignor] [Assignee]
will pay to the Administrative Agent the processing fee referred to in Section
                                                                       -------
10.11.1 of the Credit Agreement upon the delivery hereof.
- -------                                                  

     The Assignee hereby advises each of you of the following administrative
details with respect to the assigned Loans and Commitment and requests the
Administrative Agent to acknowledge receipt of this document:

          (A)  Address for Notices:

                    Institution Name:
                    Attention:
                    Domestic Office:
                    Telephone:
                    Facsimile:
                    Telex (Answerback):
                    LIBOR Office:



                                      -2-
<PAGE>
 
                    Telephone:
                    Facsimile:
                    Telex (Answerback):

          (B)  Payment Instructions:

     The Assignee agrees to furnish the tax form required by the to last
paragraph of Section 4.6 (if so required) of the Credit Agreement no later than
             -----------                                                       
the date of acceptance hereof by the Administrative Agent.

     This Agreement may be executed by the Assignor, the Assignee and the
Borrowers in separate counterparts, each of which when so executed and delivered
shall be deemed to be an original and all of which taken together shall
constitute one and the same agreement.

Adjusted Percentage                [ASSIGNOR]
- -------------------                          

  Commitment
     and all
      Loans:          __%


                                    By:_______________________
                                       Title:

Percentage                         [ASSIGNEE]
- ----------                                   

  Commitment
     and all
    Loans:            __%


                                    By:_______________________
                                       Title:

Accepted and Acknowledged
this __ day of _______, 19__

THE BANK OF NOVA SCOTIA,
  NEW YORK AGENCY,
  as Administrative Agent

By:________________________
   Title:

AMBAC FINANCIAL GROUP, INC.

By:________________________
   Title:

AMBAC ASSURANCE CORPORATION

By:________________________
   Title:




                                      -3-
<PAGE>
 
                                                            EXHIBIT E-1



                                 [Form of Opinion of Shearman & Sterling]



                                         [Closing Date]



The Bank of Nova Scotia,
  individually and as the
  Administrative Agent
  (as defined below)
One Liberty Plaza
New York, New York  10006

Citibank, N.A.
399 Park Avenue
New York, New York  10043

The First National Bank of Chicago
First National Plaza
Chicago, Illinois  60670


                    Ambac Financial Group, Inc.
                    Ambac Assurance Corporation
                    ---------------------------

Ladies and Gentlemen:

     This opinion is delivered to you pursuant to Section 5.1.3(a) of the Credit
Agreement, dated as of August 3, 1998 (the "Credit Agreement"), among Ambac
Financial Group, Inc., a Delaware corporation ("Ambac Financial"), Ambac
Assurance Corporation, a Wisconsin stock insurance corporation ("Ambac
Assurance"; Ambac Financial and Ambac Assurance being, collectively, the
"Borrowers"), each of you as Lenders, The Bank of Nova Scotia ("BNS"), acting
through its New York Agency, as arranger and administrative agent for the
Lenders (the "Administrative Agent"), Citibank, N.A., as documentation agent,
and The First National Bank of Chicago ("FNBC"), as co-agent (BNS, Citibank, and
FNBC in such capacity individually referred to as an "Agent" and collectively
referred to as the "Agents").  Unless otherwise defined herein, terms defined in
the Credit Agreement are used herein as therein defined.

     We have acted as special New York counsel for the Borrowers in connection
with the preparation, execution and delivery of the Credit Agreement.


     In that connection, we have examined:
<PAGE>
 
          (1) The Credit Agreement,

          (2)  The Notes dated the date hereof, executed by Ambac Financial and
     payable to each of you as Lenders (collectively, the "Ambac Financial
     Notes").

          (3)  The Notes dated the date hereof, executed by Ambac Assurance and
     payable to each of you as Lenders (collectively, the "Ambac Assurance
     Notes").

We have also examined the originals, or copies certified to our satisfaction, of
such certificates of officers of the respective Borrowers, and agreements,
instruments and other documents, as we have deemed necessary as a basis for the
opinions expressed below.  As to questions of fact material to such opinions, we
have, when relevant facts were not independently established by us, relied upon
certificates of the Borrowers or their respective officers.

          In our examination of the documents and certificates referred to
above, we have assumed the authenticity of all such documents and certificates
submitted to us as originals, the genuineness of all signatures, the due
authority of the parties executing such documents and certificates, and the
conformity to the originals of all such documents submitted to us as copies.  We
have also assumed, without independent investigation, that (a) each Borrower (i)
is a corporation duly organized and validly existing under the laws of the state
of its incorporation and (ii) has full power and authority to enter into and
perform its Obligations under each Loan Document to which it a party, (b) the
execution, delivery and performance by each Borrower of the Loan Documents to
which it is a party have been duly authorized by all necessary corporate action
and do not violate or contravene any statutory law, rule or regulation
applicable to such Borrower or any agreement, instrument or other document
binding on or affecting such Borrower or any constituent document of such
Borrower, (c) no authorization, approval or other action by, and no notice to or
filing with, any governmental authority or regulatory body or any other Person
is required for the due execution, delivery or performance by either Borrower of
the Loan Documents to which it is a party, or if any such authorization,
approval, action, notice or filing is required therefor, it has been duly
obtained or made and is in full force and effect, (d) the Credit Agreement has
been duly executed and delivered, with all necessary power and authority
(corporate and otherwise), by each of you and (e) the Credit Agreement and the
Ambac Assurance Notes have been duly executed and delivered on behalf of Ambac
Assurance.




                                      -2-
<PAGE>
 
     Based upon the foregoing and upon such investigation as we have deemed
necessary, we are of the following opinions:

          1.  The Credit Agreement and the Ambac Financial Notes
     have been duly executed and delivered on behalf of Ambac Financial.

          2.  The Credit Agreement and the Ambac Financial Notes are legal,
     valid and binding obligations of Ambac Financial, enforceable against Ambac
     Financial in accordance with their respective terms.

          3.  The Credit Agreement and the Ambac Assurance Notes are legal,
     valid and binding obligations of Ambac Assurance, enforceable against Ambac
     Assurance in accordance with their respective terms.

The opinions set forth above are subject to the following qualifications:

               (a)  Our opinions in paragraph 2 and 3 above are subject to the
          effect of any applicable bankruptcy, insolvency (including, without
          limitation, all laws relating to fraudulent transfers),
          reorganization, moratorium or similar law affecting creditors' rights
          generally.

               (b)  Our opinions in paragraphs 2 and 3 above are subject to the
          effect of general principles of equity, including, without limitation,
          concepts of materiality, reasonableness, good faith and fair dealing
          (regardless of whether considered in a proceeding in equity or at
          law).

               (c)  We express no opinion as to the enforceability of the
          indemnification provisions set forth in Section 10.4 of the Credit
          Agreement to the extent enforcement thereof is contrary to public
          policy regarding the exculpation of criminal violations, intentional
          harm and acts of gross negligence or recklessness.

               (d) With respect to submission to the jurisdiction of the federal
          courts of the United States, we note the limitation of 28 U.S.C.
          (S)1332 on federal court jurisdiction in cases where diversity of
          citizenship is lacking and we also note that such submission cannot
          supersede the court's discretion in determining whether to transfer an
          action from one federal court to another under 28 U.S.C. (S)1404(a).
          We express no opinion with respect to waivers of objections that an
          action brought 




                                      -3-
<PAGE>
 
          in a federal court of the United States was brought in an improper
          forum.

               (e) Our opinions expressed above are limited to the law of the
          State of New York and the federal law of the United States, and we do
          not express any opinion herein concerning any other law. Without
          limiting the generality of the foregoing, we express no opinion as to
          the effect of the law of any jurisdiction other than the State of New
          York wherein any Lender may be located or wherein enforcement of the
          Credit Agreement or the Notes may be sought which limits the rates of
          interest legally chargeable or collectible.

     A copy of this opinion letter may be delivered by you to Mayer, Brown &
Platt which may rely on the opinions in paragraph 1 above for the purpose of
rendering its opinion letter pursuant to Section 5.1.3(e) of the Credit
Agreement on the date hereof.  In addition, a copy of this opinion letter may be
delivered by each of you to any Assignee Lender in connection with and at the
time of any assignment and delegation by any of you as a Lender to such Assignee
Lender of a portion of your Loans and Commitment in accordance with the
provisions of the Credit Agreement, and such Assignee Lender may rely on the
opinions expressed above with respect to the Credit Agreement as if this opinion
letter were addressed and delivered to such Assignee Lender on the date hereof.

     This opinion letter speaks only as of the date hereof.  We expressly
disclaim any responsibility to advise any of you or any other Person who is
permitted to rely on any opinion expressed herein as specified in the next
preceding paragraph of any development or circumstance of any kind including any
change of law or fact that may occur after the date of this opinion letter even
though such development, circumstance or change may affect the legal analysis, a
legal conclusion or any other matter set forth in or relating to this opinion
letter.



                              Very truly yours,






                                      -4-
<PAGE>
 
                                                            EXHIBIT E-2



          [Form of Opinion of Anne G. Gill, Vice President, Counsel,
            and Assistant Secretary to Ambac Financial Group, Inc.]


                                         [Closing Date]

The Bank of Nova Scotia,
  individually and as the
  Administrative Agent
  (as defined below)
One Liberty Plaza
New York, New York  10006

Citibank, N.A.
399 Park Avenue
New York, New York  10043

The First National Bank of Chicago
First National Plaza
Chicago, Illinois  60670

                    Ambac Financial Group, Inc.
                    ---------------------------

Ladies and Gentlemen:

     This opinion is delivered to you pursuant to Section 5.1.3(b) of the Credit
Agreement, dated as of August 3, 1998 (the "Credit Agreement"), among Ambac
Financial Group, Inc., a Delaware corporation ("Ambac Financial"), Ambac
Assurance Corporation, a Wisconsin stock insurance corporation, each of you as
Lenders, The Bank of Nova Scotia, acting through its New York Agency, as
Arranger and Administrative Agent for the Lenders (the "Administrative Agent"),
Citibank, N.A., as Documentation Agent and The First National Bank of Chicago,
as Co-Agent (BNS, Citibank, and FNBC in such capacity individually referred to
as an "Agent" and collectively referred to as the "Agents").  Unless otherwise
defined herein, terms defined in the Credit Agreement are used herein as therein
defined.

     I am a Vice President, Counsel, and Assistant Secretary of Ambac Financial
and have acted as counsel to Ambac Financial in connection with the preparation,
execution and delivery of the Credit Agreement.

     In that connection, I have examined:

          1.  the Credit Agreement;
<PAGE>
 
          2.  the Notes dated the date hereof, executed by Ambac Financial and
     payable to each of you as Lenders (the "Ambac Financial Notes");

          3.  the Restated Certificate of Incorporation of Ambac Financial and
     all amendments thereto (the "Charter"); and

          4.  the by-laws of Ambac Financial and all amendments thereto (the
     "By-Laws").

I have also examined and am familiar with the originals, or copies certified or
otherwise identified to my satisfaction, of such documents and corporate records
of Ambac Financial, certificates of public officials and officers of Ambac
Financial and agreements, instruments and other documents, as I have deemed
necessary as a basis for the opinions expressed below.  As to questions of fact
material to such opinions, I have, when relevant facts were not independently
established by me, relied, to the extent I deemed appropriate, upon certificates
of Ambac Financial or its officers, or of public officials.  In addition, I have
also assumed the genuineness of all signatures, the authenticity of all
documents submitted to me as originals and the conformity with originals of all
documents submitted to me as copies thereof.  I have also assumed the due
execution and delivery, pursuant to due authorization, of the Credit Agreement
by each of the Lenders and the Agents.

     I am qualified to practice law in the State of New York.  I do not purport
to express any opinion herein as to the laws of any jurisdiction other than the
laws of the State of New York, the General Corporation Law of the State of
Delaware and the Federal laws of the United States of America.

     Based upon the foregoing and upon such investigation as I have deemed
necessary, I am of the following opinion:

          1.  Ambac Financial is a corporation duly organized, validly existing
     and in good standing under the laws of the State of Delaware.  Ambac
     Financial is duly qualified to do business and is in good standing as a
     foreign corporation in each jurisdiction where the nature of its business
     requires such qualification, except where the failure to be so qualified,
     singly or in the aggregate, would not have a Material Adverse Effect.

          2.  The execution, delivery and performance by Ambac Financial of the
     Credit Agreement and the Ambac Financial Notes are within Ambac Financial's
     corporate powers, and have been duly authorized by all necessary corporate
     action on the part of Ambac Financial.





                                      -2-
<PAGE>
 
          3.  To the best of my knowledge, there is no pending or threatened
     action or proceeding against Ambac Financial before any court, governmental
     agency or arbitrator which purports to affect the legality, validity,
     binding effect or enforceability of the Credit Agreement or any of the
     Ambac Financial Notes, or which may reasonably be expected to have a
     Material Adverse Effect.

          4.  The execution, delivery and performance by Ambac Financial of the
     Credit Agreement and the Ambac Financial Notes do not violate or contravene
     its Charter or By-laws, or any statutory law applicable to Ambac Financial
     or any rule or regulation applicable to Ambac Financial.

          5.  The execution, delivery and performance by Ambac Financial of the
     Credit Agreement and the Ambac Financial Notes do not conflict with or
     result in a breach of any of the terms or provisions of, or constitute a
     default under (i) any indenture, loan agreement, lease, guarantee, mortgage
     or other agreement or instrument, or (ii) any order, writ, judgment, award,
     injunction or decree known to me to which Ambac Financial is a party or by
     which it is bound or to which any of its properties or assets are subject,
     except for such conflicts, breaches or defaults, which individually or in
     the aggregate, would not have any Material Adverse Effect and would not
     have a material adverse effect on the legality, validity, binding effect or
     enforceability of the Credit Agreement or Ambac Financial Notes.

          6.  No authorization, approval or other action by, and no notice to or
     filing with, any governmental authority or regulatory body is required for
     the due execution, delivery and performance by Ambac Financial of the
     Credit Agreement or any Ambac Financial Note.

     A copy of this opinion letter may be delivered by you to Mayer, Brown &
Platt which may rely on the opinions above for the purpose of rendering its
opinion letter pursuant to Section 5.1.3(e) of the Credit Agreement on the date
hereof.  In addition, a copy of this opinion letter may be delivered by each of
you to any Assignee Lender in connection with and at the time of any assignment
and delegation by either of you as a Lender to such Assignee Lender of a portion
of your Loans and Commitment in accordance with the provisions of the Credit
Agreement, and such Assignee Lender may rely on the opinions expressed above
with respect to the Credit Agreement as if this opinion letter were addressed
and delivered to such Assignee Lender on the date hereof.




                                      -3-
<PAGE>
 
     This opinion letter speaks only as of the date hereof.  I do not assume,
and I expressly disclaim, any responsibility to advise either of you or any
other person who is permitted to rely on any opinion expressed herein as
specified in the next preceding paragraph of any change of law or fact that may
occur after the date of this opinion letter even though such change may affect
the legal analysis, a legal conclusion or any other matter set forth in or
relating to this opinion letter.

     This opinion is given pursuant to the Credit Agreement and in connection
with the Loan Documents and is not to be relied upon for any other purpose.

                              Very truly yours,



                              Anne G. Gill
                              Vice President, Counsel and
                                  Assistant Secretary





                                      -4-
<PAGE>
 
                                                            EXHIBIT E-3



               [Form of Opinion of Anne G. Gill, Vice President,
              Assistant General Counsel, and Assistant Secretary
                        to Ambac Assurance Corporation]



                                         [Closing Date]



The Bank of Nova Scotia,
  individually and as the
  Administrative Agent
  (as defined below)
One Liberty Plaza
New York, New York  10006

Citibank, N.A.
399 Park Avenue
New York, New York  10043

The First National Bank of Chicago
First National Plaza
Chicago, Illinois  60670


                    Ambac Assurance Corporation
                    ---------------------------

Ladies and Gentlemen:

     This opinion is delivered to you pursuant to Section 5.1.3(c) of the Credit
Agreement, dated as of August 3, 1998 (the "Credit Agreement"), among Ambac
Financial Group, Inc., a Delaware corporation ("Ambac Financial"), Ambac
Assurance Corporation, a Wisconsin stock insurance corporation ("Ambac
Assurance"), each of you as Lenders, The Bank of Nova Scotia, acting through its
New York Agency, as Arranger and Administrative Agent for the Lenders (the
"Administrative Agent"), Citibank, N.A., as Documentation Agent and The First
National Bank of Chicago, as Co-Agent (BNS, Citibank and FNBC, in such capacity
individually referred to as an "Agent" and collectively referred to as the
"Agents").  Unless otherwise defined herein, terms defined in the Credit
Agreement are used herein as therein defined.

     I am a Vice President, Assistant General Counsel, and Assistant Secretary
of Ambac Assurance and have acted as counsel to Ambac Assurance in connection
with the preparation, execution and delivery of the Credit Agreement.

     In that connection, I have examined:
<PAGE>
 
          1.  the Credit Agreement;

          2.  the Notes dated the date hereof, executed by Ambac Assurance and
     payable to each of you as Lenders (the "Ambac Assurance Notes");

          3.  the Restated Articles of Incorporation of Ambac Assurance and all
     amendments thereto (the "Charter"); and

          4.  the restated by-laws of Ambac Assurance and all amendments thereto
     (the "By-Laws").

I have also examined and am familiar with originals or copies, certified or
otherwise identified to my satisfaction, of such documents and corporate records
of Ambac Assurance, certificates of public officials and officers of Ambac
Assurance and agreements, instruments and other documents, as I have deemed
necessary as a basis for the opinions expressed below.  As to questions of fact
material to such opinions, I have, when relevant facts were not independently
established by me, relied, to the extent I deemed appropriate, upon certificates
of Ambac Assurance or its officers, or of public officials.  In addition, I have
also assumed the genuineness of all signatures, the authenticity of all
documents submitted to me as originals and the conformity with originals of all
documents submitted to me as copies thereof.  I have also assumed the due
execution and delivery, pursuant to due authorization, of the Credit Agreement
by each of the Lenders and the Agents.

     I am qualified to practice law in the State of New York.  I do not purport
to express any opinion herein as to the laws of any jurisdiction other than the
laws of the State of New York and the Federal laws of the United States of
America.

     Based upon the foregoing and upon such investigation as I have deemed
necessary, I am of the following opinion:

          1.   Ambac Assurance is duly qualified to do business and is in good
     standing as a foreign corporation in each jurisdiction where the nature of
     its business requires such qualification, except where the failure to be so
     qualified, singly or in the aggregate, would not have a Material Adverse
     Effect.

          2.  To the best of my knowledge, there is no pending or threatened
     action or proceeding against Ambac Assurance before any court, governmental
     agency or arbitrator which purports to affect the legality, validity,
     binding effect or enforceability of the Credit Agreement or any of the
     Ambac 




                                      -2-
<PAGE>
 
     Assurance Notes, or which may reasonably be expected to have a
     Material Adverse Effect.

          3.  All the outstanding shares of capital stock of
     Ambac Assurance are fully paid and non-assessable and issued to, and held
     of record by, Ambac Financial.

          4.  The execution, delivery and performance by Ambac Assurance of the
     Credit Agreement and the Ambac Assurance Notes do not violate any statutory
     law applicable to Ambac Assurance or any rule or regulation applicable to
     Ambac Assurance.

          5.  The execution, delivery and performance by Ambac Assurance of the
     Credit Agreement and the Ambac Assurance Notes do not conflict with or
     result in a breach of any of the terms or provisions of, or constitute a
     default under (i) any indenture, loan agreement, lease, guarantee, mortgage
     or other agreement or instrument, or (ii) any order, writ, judgment, award,
     injunction or decree known to me to which Ambac Assurance is a party or by
     which it is bound or to which any of its properties or assets are subject,
     except for such conflicts, breaches or defaults, which, individually or in
     the aggregate, would not have any Material Adverse Effect and would not
     have a material adverse effect on the legality, validity, binding effect or
     enforceability of the Credit Agreement or the Ambac Assurance Notes.

          6.  No authorization, approval or other action by, and no notice to or
     filing with, any governmental authority on regulatory body is required for
     the due execution, delivery and performance by Ambac Assurance of the
     Credit Agreement or any Ambac Assurance Note.

          7.  The Credit Agreement and the Ambac Assurance Notes have been duly
     executed and delivered on behalf of Ambac Assurance.

     A copy of this opinion letter may be delivered by you to Mayer, Brown &
Platt which may rely on the opinions above for the purpose of rendering its
opinion letter pursuant to Section 5.1.3(e) of the Credit Agreement on the date
hereof.  In addition, a copy of this opinion letter may be delivered by each of
you to any Assignee Lender in connection with and at the time of any assignment
and delegation by either of you as a Lender to such Assignee Lender of a portion
of your Loans and Commitment in accordance with the provisions of the Credit
Agreement, and such Assignee Lender may rely on the opinions expressed above
with respect to the Credit Agreement as if this opinion letter were 


                                      -3-
<PAGE>
 
addressed and delivered to such Assignee Lender on the date hereof.

     This opinion letter speaks only as of the date hereof.  I do not assume,
and I expressly disclaim, any responsibility to advise either of you or any
other person who is permitted to rely on any opinion expressed herein as
specified in the next preceding paragraph of any change of law or fact that may
occur after the date of this opinion letter even though such change may affect
the legal analysis, a legal conclusion or any other matter set forth in or
relating to this opinion letter.

     This opinion is given pursuant to the Credit Agreement and in connection
with the Loan Documents and is not to be relied upon for any other purpose.

                         Very truly yours,


                         Anne G. Gill
                         Vice President, Assistant General
                         Counsel, and Assistant Secretary






                                      -4-
<PAGE>
 
                                                            EXHIBIT E-4



               [Form of Opinion of DeWitt Ross & Stevens, S.C.]



                                         [Closing Date]



The Bank of Nova Scotia,
  individually and as the
  Administrative Agent
  (as defined below)
One Liberty Plaza
New York, New York  10006

Citibank, N.A.
399 Park Avenue
New York, New York  10043

First National Bank of Chicago
First National Plaza
Fleet 0085 - 16th Floor
Chicago, Illinois  60670

                    Ambac Assurance Corporation
                    ---------------------------

Ladies and Gentlemen:


     This opinion is delivered to you pursuant to Section 5.1.3(d) of the Credit
Agreement, dated as of August 3, 1998 (the "Credit Agreement"), among Ambac
Financial Group, Inc., a Delaware corporation ("Ambac Financial"), Ambac
Assurance Corporation, a Wisconsin stock insurance corporation ("Ambac
Assurance"; together with Ambac Financial, the "Borrowers"), the various
commercial lending institutions as are or may become parties thereto
(collectively, the "Lenders"), The Bank of Nova Scotia, acting through its New
York Agency, as administrative agent for the Lenders (the "Administrative
Agent") and Citibank, N.A., as Documentation Agent (BNS and Citibank, in such
capacity individually referred to as an "Agent" and collectively referred to as
the "Agents").  Unless otherwise defined herein, terms to which meanings are
ascribed in the Credit Agreement are used herein with such meanings.

     We have acted as special counsel for Ambac Assurance in connection with the
preparation, execution and delivery of the Credit Agreement.

     In that connection, we have examined:
<PAGE>
 
          1.  the Credit Agreement;

          2.  the Notes;

          3.  the Restated Articles of Incorporation of Ambac Assurance and all
     amendments thereto (the "Charter");

          4.  the Restated By-Laws of Ambac Assurance and all amendments thereto
     (the "By-Laws"); and

          5.  the certificate of authority issued to Ambac Assurance by the
     Office of the Commissioner of Insurance for the State of Wisconsin.

We have examined the originals, or copies certified to our satisfaction, of such
other corporate records of Ambac Assurance, certificates of public officials and
of officers of Ambac Assurance and agreements, instruments and other documents,
as we have deemed necessary as a basis for the opinions expressed below.  As to
questions of fact material to such opinions, we have, when relevant facts were
not independently established by us, relied, to the extent we deemed
appropriate, upon certificates of Ambac Assurance or its officers, or of public
officials.  We have assumed the due execution and delivery, pursuant to due
authorization, of the Credit Agreement by the Lenders and the Agents.  We have
assumed the due execution and delivery of the Credit Agreement and the Notes,
the genuineness of all signatures, the authenticity of all documents submitted
to us as originals and the conformity to originals of all documents submitted to
us as copies thereof.


QUALIFICATIONS AND ASSUMPTIONS

          1.  We are qualified to practice law in the State of Wisconsin and the
     opinions expressed herein relate solely to the laws of the State of
     Wisconsin and are limited to the presently existing statutes of the State
     of Wisconsin and the published decisions of the State of Wisconsin and
     federal courts.

          2.  We assume that Ambac Financial is a Delaware corporation and
     wholly owns the outstanding capital stock of Ambac Assurance, which fact
     has been certified to us by Ambac Financial.

          3.  The insurance laws of the State of Wisconsin govern the activities
     of Ambac Assurance and the agreements, transactions and other activities
     between Ambac Assurance and its affiliates, including Ambac Financial.  The
     opinions set forth below are limited to the agreements and other documents
     specified herein and no opinion is rendered herein 





                                      -2-
<PAGE>
 
     regarding any agreements or transactions between Ambac Assurance and its
     affiliates, including Ambac Financial.

OPINION

     Based solely upon the foregoing and subject to the qualifications and
assumptions stated above, in our opinion:

          1.  Ambac Assurance is a corporation duly organized, validly existing
     and in good standing under the laws of the State of Wisconsin.  Ambac
     Assurance is licensed as an insurance company by the Office of the
     Commissioner of Insurance of the State of Wisconsin.

          2.  The execution, delivery and performance by Ambac Assurance of the
     Credit Agreement and the Notes to which it is a party (a) are within Ambac
     Assurance's corporate powers and have been duly authorized by all necessary
     corporate action on the part of Ambac Assurance and (b) do not violate or
     contravene the Charter or By-Laws of Ambac Assurance or any laws or
     regulations of the State of Wisconsin.

          3.  No authorization, approval or other action by and no notice to or
     filing with the Office of the Commissioner of Insurance of the State of
     Wisconsin or any other Wisconsin governmental authority or regulatory body
     is required for the due execution, delivery and performance by either
     Borrower of the Credit Agreement or the Notes to which it is a party.

          4.  (a) The New York governing law clauses of the Credit Agreement and
     the Notes to which Ambac Assurance is a party are valid under the law of
     the State of Wisconsin.

              (b) Under the law of the State of Wisconsin, the law of the State
          of New York will be applied to the Loan Documents to which Ambac
          Assurance is a party, except to the extent that any term of such
          document or any provision of the law of the State of New York
          applicable to such document violates an important public policy of the
          State of Wisconsin.  We have no reason to believe that any such term
          violates an important public policy of the State of Wisconsin.

          5.  Assuming that the Credit Agreement and the Notes to which Ambac
     Assurance is a party are legal, valid, binding and enforceable under the
     law of the State of New York, the Credit Agreement and such Notes
     constitute the legal, valid and binding obligations of Ambac Assurance, and
     are enforceable against Ambac Assurance in accordance with their respective
     terms.



                                      -3-
<PAGE>
 
The opinions set forth above are subject to the following qualifications:

               (a)  Our opinion in paragraph 5 is subject to the effect of any
          applicable bankruptcy, insolvency (including, without limitation, all
          laws relating to fraudulent transfers), reorganization, moratorium or
          similar law affecting creditors' rights generally.

               (b)  Our opinion in paragraph 5 above is also subject to the
          effect of general principles of equity, including (without limitation)
          concepts of materiality, reasonableness, good faith and fair dealing
          (regardless of whether considered in a proceeding in equity or at
          law).

     A copy of this opinion letter may be delivered by you to Mayer, Brown &
Platt which may rely on the opinions above for the purpose of rendering its
opinion letter pursuant to Section 5.1.3(e) of the Credit Agreement on the date
hereof.  Anne G. Gill, Esq., Vice President, Assistant General Counsel, and
Assistant Secretary to Ambac Assurance may rely on the opinions above for the
purpose of rendering her opinion letter pursuant to Section 5.1.3(c) of the
Credit Agreement on the date hereof.  In addition, a copy of this opinion letter
may be delivered by each of you to any Assignee Lender in connection with and at
the time of any assignment and delegation by either of you as a Lender to such
Assignee Lender of a portion of your Loans and Commitment in accordance with the
provisions of the Credit Agreement, and such Assignee Lender may rely on the
opinions expressed above with respect to the Credit Agreement as if this opinion
letter were addressed and delivered to such Assignee Lender on the date hereof.

     This opinion letter speaks only as of the date hereof.  We do not assume,
and we expressly disclaim, any responsibility to advise either of you or any
other person who is permitted to rely on any opinion expressed herein as
specified in the next preceding paragraph of any change of law or fact that may
occur after the date of this opinion letter even though such change may affect
the legal analysis, a legal conclusion or any other matter set forth in or
relating to this opinion letter.

     This opinion is given pursuant to the Credit Agreement and in connection
with the Loan Documents and is not to be relied upon for any other purpose.

                              Very truly yours,



                              DEWITT ROSS & STEVENS, S.C.



                                      -4-
<PAGE>
 
                                                                       EXHIBIT F
                   [Form of Opinion of Mayer, Brown & Platt]


                                                 [Closing Date]          



The Bank of Nova Scotia,
 individually and as the
 Administrative Agent
 (as defined below)
One Liberty Plaza
New York, New York  10006

Citibank, N.A.
399 Park Avenue
New York, New York  10043

The First National Bank of Chicago
First National Plaza
Chicago, Illinois 60670

                    Ambac Financial Group, Inc.
                    Ambac Assurance Corporation
                    ---------------------------

Ladies and Gentlemen:

     This opinion is delivered to you pursuant to Section 5.1.3(e) of the Credit
Agreement, dated as of August 3, 1998 (the "Credit Agreement"), among Ambac
Financial Group, Inc., a Delaware corporation ("Ambac Financial"), Ambac
Assurance Corporation, a Wisconsin corporation ("Ambac Assurance"; together with
Ambac Financial, the "Borrowers"), each of you as Lenders, The Bank of Nova
Scotia ("BNS"), acting through its New York Agency, as arranger and
administrative agent for the Lenders (the "Administrative Agent"), Citibank,
N.A., as documentation agent, The First National Bank of Chicago ("FNBC"), as
co-agent (BNS, Citibank, and FNBC in such capacity individually referred to as
an "Agent" and collectively referred to as the "Agents").  Unless otherwise
defined herein, terms to which meanings are ascribed in the Credit Agreement are
used herein with such meanings.

     We have acted as special New York counsel to the Administrative Agent in
connection with the preparation, 
<PAGE>
 
execution and delivery of the Credit Agreement and the Notes, and we have
participated in the closing held in connection therewith.

     In that regard, we have examined fully executed counterparts or copies
certified or otherwise identified to our satisfaction of the following
documents, each dated as of the date hereof:

          (a)  the Credit Agreement; and

          (b) the Notes, dated the date hereof and payable to each of you as
     Lenders (collectively, the "Borrower Notes").

     We have assumed, without independent investigation, the genuineness of all
signatures, the authenticity of all documents submitted to us as originals, the
conformity with originals of all such documents submitted to us as copies and
the due execution and delivery thereof by each party thereto (including the
Agents and each Lender) pursuant to due authorization (corporate and otherwise)
and with all requisite corporate power.  We have also assumed that the Credit
Agreement is a valid and binding obligations of the parties thereto (other than
the Borrowers), enforceable in accordance with their respective terms.  We have
also assumed, without independent investigation, that (a) each Borrower (i) is a
corporation duly organized and validly existing under the laws of the state of
its incorporation and (ii) has full power and authority to enter into and
perform its Obligations under each Loan Document to which it a party, (b) the
execution, delivery and performance by each Borrower of the Loan Documents to
which it is a party have been duly authorized by all necessary corporate action
and do not violate or contravene any statutory law, rule or regulation
applicable to such Borrower or any agreement, instrument or other document
binding on or affecting such Borrower or any constituent document of such
Borrower, (c) no authorization, approval or other action by, and no notice to or
filing with, any governmental authority or regulatory body or any other Person
is required for the due execution, delivery or performance by either Borrower of
the Loan Documents to which it is a party, or if any such authorization,
approval, action, notice or filing is required therefor, it has been duly
obtained or made and is in full force and effect, (d) the Credit Agreement has
been duly executed and delivered, with all necessary power and authority
(corporate and otherwise), by each of the parties thereto and constitutes the
legal, valid and binding obligation of the parties thereto (other than the
Borrowers), and (e) the Credit Agreement and the Borrower Notes have been duly
executed and delivered by each Borrower party thereto.

     As to factual matters, we have relied upon the representations and
warranties contained in the Loan Documents and the certificates delivered in
connection therewith.



                                      -2-
<PAGE>
 
     Based upon the foregoing examination of documents and assumptions and upon
such other investigation as we have deemed necessary, we are of the opinion that
the Credit Agreement and the Borrower Notes constitute legal, valid and binding
obligations of each Borrower that is a party thereto, enforceable against such
Borrower in accordance with their respective terms.

     Our opinion set forth above is subject to the following qualifications:

          (a)  Our opinion is limited to the laws of the State of New York and
     we do not express any opinion herein concerning any other law.

          (b)  Our opinion is limited by (i) applicable bankruptcy, insolvency
     (including, without limitation all laws relating to fraudulent transfers),
     reorganization, moratorium and other similar laws affecting creditors'
     rights generally, and (ii) the effect of general principles of equity
     including, without limitation, concepts of materiality, reasonableness,
     good faith and fair dealing (regardless of whether considered in a
     proceeding at law or in equity).

          (c)  We express no opinion as to the enforceability of the
     indemnification provisions set forth in Section 10.4 of the Credit
     Agreement to the extent enforcement thereof is contrary to public policy
     regarding the exculpation of criminal violations, intentional harm and acts
     of gross negligence or recklessness.

          (d) With respect to submission to the jurisdiction of the federal
     courts of the United States, we note the limitation of 28 U.S.C. (S)1332 on
     federal court jurisdiction in cases where diversity of citizenship is
     lacking and we also note that such submission cannot supersede the court's
     discretion in determining whether to transfer an action from one federal
     court to another under 28 U.S.C. (S)1404(a).  We express no opinion with
     respect to waivers of objections that an action brought in a federal court
     of the United States was brought in an improper forum.

          (e) We express no opinion as to the effect of the law of any
     jurisdiction other than the State of New York wherein the Administrative
     Agent, or any Lender may be located or wherein enforcement of the Credit
     Agreement or the Notes may be sought which limits the rates of interest
     legally chargeable or collectible.




                                      -3-
<PAGE>
 
     A copy of this opinion letter may be delivered by each of you to any
Assignee Lender in connection with and at the time of any assignment and
delegation by any of you as a Lender to such Assignee Lender of a portion of
your Loans and Commitment in accordance with the provisions of the Credit
Agreement, and such Assignee Lender may rely on the opinions expressed above
with respect to the Credit Agreement as if this opinion letter were addressed
and delivered to such Assignee Lender on the date hereof.

     This opinion letter speaks only as of the date hereof.  We expressly
disclaim any responsibility to advise any of you or any other Person who is
permitted to rely on any opinion expressed herein as specified in the next
preceding paragraph of any development or circumstance of any kind, including
any change of law or fact that may occur after the date of this opinion letter
even though such development, circumstance or change may affect the legal
analysis, a legal conclusion or any other matter set forth in or relating to
this opinion letter.

     This opinion letter is being furnished to you for your use in connection
with the transactions contemplated by the Credit Agreement.



                              Very truly yours,




                                      -4-
<PAGE>
 
                                                            SCHEDULE I



                                 Opinion Letters
                                 ---------------


1.   Shearman & Sterling
2.   Anne G. Gill, Esq., Vice President, Counsel and Assistant 
     Secretary of Ambac Financial
3.   Anne G. Gill, Esq., Vice President, Assistant General 
     Counsel, and Assistant Secretary of Ambac Assurance
4.   DeWitt Ross & Stevens, S.C.













                                      -5-
<PAGE>
 
                                                            EXHIBIT G



                            COMPLIANCE CERTIFICATE

                          AMBAC FINANCIAL GROUP, INC.
                          AMBAC ASSURANCE CORPORATION
                          ---------------------------

     This certificate is delivered pursuant to clause (c) of Section 7.1.1 of
                                               ----------    -------------   
the Credit Agreement dated as of August 3, 1998 (together with all amendments
and other modifications, if any, from time to time made thereto, the "Credit
                                                                      ------
Agreement"), among AMBAC FINANCIAL GROUP, INC. ("Ambac Financial"), AMBAC
- ---------                                        ---------------         
ASSURANCE CORPORATION ("Ambac Assurance"; together with Ambac Financial, the
                        ---------------                                     
"Borrowers"), the various commercial lending institutions as are or may become
- ----------                                                                    
parties (hereto collectively, the "Lenders"), THE BANK OF NOVA SCOTIA, ("BNS"),
                                   -------                               ---   
acting through its New York Agency, as Administrative Agent, CITIBANK, N.A.
                                                                           
("Citibank"), as Documentation Agent (BNS and Citibank, in such capacity
- ----------                                                              
individually referred to as an "Agent" and collectively referred to as the
                                -----                                     
"Agents"). Unless otherwise defined herein, terms used herein and in the
- -------                                                                 
Attachments hereto have the meanings provided therefor in the Credit Agreement.


     This Compliance Certificate relates to the ____ Fiscal Quarter, commencing
on ______, _____ and ending on _______, ____ (such latter date being the
                                                                        
"Computation Date").  The Borrowers hereby further certify, represent and
- -----------------                                                        
warrant that as of the Computation Date:

     (1)  No Default has occurred and is continuing;

     (2)  The Leverage Ratio on the Computation Date was ___ to 1.00, as
computed on Attachment 1 hereto.  The maximum Leverage Ratio permitted pursuant
            ------------                                                       
to Section 7.2.5 of the Credit Agreement on the Computation Date is .40 to 1.00,
   -------------                                                                
and accordingly, Section 7.2.5 of the Credit Agreement has been complied with;
                 -------------                                                
and

     IN WITNESS WHEREOF, each of the undersigned has caused this Compliance
Certificate to be delivered by its respective chief financial Authorized Officer
this __ day of _________, ____.



                                    AMBAC FINANCIAL GROUP, INC.



                                    By:________________________________
                                       Title:


                                    AMBAC ASSURANCE CORPORATION


                                    By:________________________________
                                       Title:
<PAGE>
 
                                                            Attachment 1
                                                            (to __/__/__
                                                    Compliance Certificate)


                                 LEVERAGE RATIO
                                 --------------
                            As of __________, ____
                           (the "Computation Date")




 
A.  Total Debt of Ambac Financial and its Subsidiaries on a consolidated
    --------------------------------------------------------------------
    basis as of the Computation Date
    --------------------------------

<TABLE>
<C>       <S>                                                                           <C> 
    (1)    Borrowed money and all obligations evidenced by bonds, debentures,
           notes or other similar instruments.                                             $________
 
    (2)    All obligations, contingent or otherwise, relative to the face
           amount of all letters of credit, whether or not drawn, and banker's              
           acceptances issued for the account of Ambac Financial or its
           Subsidiaries on a consolidated basis.                                           $________
 
    (3)    All obligations as lessees under leases which have been or should be,
           in accordance with GAAP, recorded as capitalized lease liabilities.

    (4)    All Contingent Liabilities in respect of any of Items A(1), A(2) and
           Item A(3).                                                                      $________
 
    (5)    The sum of Items A(1), A(2), A(3) and Item A(4).                                $________

    (6)    To the extent included in Item A(1), Indebtedness under the Loss
           Facility.                                                                       $________
 
     (7)   Item A(5) minus Item A(6).                                                      $________

B.   Stockholders' Equity: Stockholders' equity of Ambac Financial and its
     Subsidiaries, on a consolidated basis (excluding unrealized gains on                  
     investments and unrealized losses on investments).                                    $________
 
C.   Leverage Ratio:
     --------------

     The ratio of Item A(7) to the sum of Item A(7) and Item B.                            _____ to 1.00

</TABLE>








                                      1-1

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 7
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<DEBT-HELD-FOR-SALE>                         7,791,952
<DEBT-CARRYING-VALUE>                                0
<DEBT-MARKET-VALUE>                                  0
<EQUITIES>                                       5,000
<MORTGAGE>                                           0
<REAL-ESTATE>                                        0
<TOTAL-INVEST>                               7,974,379
<CASH>                                          28,490
<RECOVER-REINSURE>                                   0
<DEFERRED-ACQUISITION>                         110,973
<TOTAL-ASSETS>                              10,235,140
<POLICY-LOSSES>                                112,651
<UNEARNED-PREMIUMS>                          1,220,701
<POLICY-OTHER>                                       0
<POLICY-HOLDER-FUNDS>                                0
<NOTES-PAYABLE>                                423,897
                                0
                                          0
<COMMON>                                           707
<OTHER-SE>                                   1,989,227
<TOTAL-LIABILITY-AND-EQUITY>                10,235,140
                                     106,502
<INVESTMENT-INCOME>                             90,912
<INVESTMENT-GAINS>                             (5,065)
<OTHER-INCOME>                                   2,200
<BENEFITS>                                       3,000
<UNDERWRITING-AMORTIZATION>                     23,208
<UNDERWRITING-OTHER>                                 0
<INCOME-PRETAX>                                164,710
<INCOME-TAX>                                    38,256
<INCOME-CONTINUING>                            126,454
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   126,454
<EPS-PRIMARY>                                     1.81
<EPS-DILUTED>                                     1.77
<RESERVE-OPEN>                                       0
<PROVISION-CURRENT>                                  0
<PROVISION-PRIOR>                                    0
<PAYMENTS-CURRENT>                                   0
<PAYMENTS-PRIOR>                                     0
<RESERVE-CLOSE>                                      0
<CUMULATIVE-DEFICIENCY>                              0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 7
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<DEBT-HELD-FOR-SALE>                         5,716,838
<DEBT-CARRYING-VALUE>                                0
<DEBT-MARKET-VALUE>                                  0
<EQUITIES>                                           0
<MORTGAGE>                                           0
<REAL-ESTATE>                                        0
<TOTAL-INVEST>                               5,859,175
<CASH>                                           6,752
<RECOVER-REINSURE>                                   0
<DEFERRED-ACQUISITION>                         101,391
<TOTAL-ASSETS>                               6,639,835
<POLICY-LOSSES>                                 61,041
<UNEARNED-PREMIUMS>                          1,031,131
<POLICY-OTHER>                                       0
<POLICY-HOLDER-FUNDS>                                0
<NOTES-PAYABLE>                                223,831
                                0
                                          0
<COMMON>                                           353
<OTHER-SE>                                   1,690,813
<TOTAL-LIABILITY-AND-EQUITY>                 6,639,835
                                      73,419
<INVESTMENT-INCOME>                             77,705
<INVESTMENT-GAINS>                               5,079
<OTHER-INCOME>                                   5,792
<BENEFITS>                                       1,392
<UNDERWRITING-AMORTIZATION>                     18,824
<UNDERWRITING-OTHER>                                 0
<INCOME-PRETAX>                                130,232
<INCOME-TAX>                                    26,881
<INCOME-CONTINUING>                            103,351
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   103,351
<EPS-PRIMARY>                                     1.48
<EPS-DILUTED>                                     1.46
<RESERVE-OPEN>                                       0
<PROVISION-CURRENT>                                  0
<PROVISION-PRIOR>                                    0
<PAYMENTS-CURRENT>                                   0
<PAYMENTS-PRIOR>                                     0
<RESERVE-CLOSE>                                      0
<CUMULATIVE-DEFICIENCY>                              0
        

</TABLE>

<PAGE>
 
                                                                 (EXHIBIT 99.03)



                 AMBAC ASSURANCE CORPORATION AND SUBSIDIARIES
          (A WHOLLY OWNED SUBSIDIARY OF AMBAC FINANCIAL GROUP, INC.)

                  CONSOLIDATED UNAUDITED FINANCIAL STATEMENT

                   AS OF JUNE 30, 1998 AND DECEMBER 31, 1997
               AND FOR THE PERIODS ENDED JUNE 30, 1998 AND 1997
<PAGE>
 
AMBAC ASSURANCE CORPORATION AND SUBSIDIARIES
NOTES TO CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS


     (1)  BASIS OF PRESENTATION

     Ambac Assurance Corporation ("Ambac Assurance") is a leading insurer of
municipal and structured finance obligations and has been assigned triple-A
claims-paying ability ratings, the highest ratings available from Moody's
Investors Service, Inc., Fitch IBCA, Inc., and Japan Rating and Investment
Information, Inc., and a financial strength rating of triple-A from Standard &
Poor's Ratings Group. Financial guarantee insurance underwritten by Ambac
Assurance guarantees payment when due of the principal of and interest on the
obligation insured. In the case of a default on the insured obligation, payments
under the insurance policy may not be accelerated by the policyholder without
Ambac Assurance's consent. As of June 30, 1998, Ambac Assurance's net insurance
in force (principal and interest) was $297.7 billion. Ambac Assurance is a
wholly-owned subsidiary of Ambac Financial Group, Inc. (NYSE: ABK), a holding
company that provides financial guarantee insurance and financial management
services to clients in both the public and private sectors in the U.S. and
abroad through its subsidiaries.

     On December 18, 1997, Ambac Assurance acquired Construction Loan Insurance
Corporation ("CLIC"). CLIC's wholly owned subsidiary, Connie Lee Insurance
Company ("Connie Lee"), a triple-A rated financial guarantee insurance company
which guaranteed bonds primarily for college and hospital infrastructure
projects, is not expected to write any new business.  Ambac Assurance and Connie
Lee have arrangements in place to assure that Connie Lee maintains a level of
capital sufficient to support Connie Lee's outstanding obligations and for
Connie Lee insured bonds to retain their triple-A rating.

     During the first quarter of 1997, Ambac Assurance established a new
subsidiary in the United Kingdom, Ambac Insurance UK Limited ("Ambac UK"), which
is authorized to conduct certain classes of general insurance business in the
United Kingdom. Ambac UK is the Company's primary vehicle for the issuance of
financial guarantee insurance policies in the United Kingdom and Europe.

     Ambac Assurance, as the sole limited partner, owns a limited partnership
representing 90% of the total partnership interests of Ambac Financial Services,
L.P. ("AFS"), a limited partnership which provides interest rate swaps primarily
to states, municipalities and their authorities. The sole general partner of
AFS, Ambac Financial Services Holdings, Inc., a wholly-owned subsidiary of Ambac
Financial Group, Inc., owns a general partnership interest representing 10% of
the total partnership interest in AFS.

          Ambac Assurance's consolidated unaudited interim financial statements
have been prepared on the basis of generally accepted accounting principles
("GAAP") and, in the opinion of management, reflect all adjustments, consisting
only of normal recurring adjustments, necessary for a fair presentation of the
Company's financial condition, results of operations and cash flows for the
periods presented. 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 disclosures of contingent assets
and liabilities at the date
<PAGE>
 
AMBAC ASSURANCE CORPORATION AND SUBSIDIARIES
NOTES TO CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS


of the financial statements and the reported revenues and expenses during the
reporting period. Actual results could differ from those estimates. The results
of operations for the six months ended June 30, 1998 may not be indicative of
the results that may be expected for the full year ending December 31, 1998.
These financial statements and notes should be read in conjunction with the
financial statements and notes included in the audited consolidated financial
statements of Ambac Assurance Corporation and its subsidiaries as of December
31, 1997 and 1996, and for each of the years in the three-year period ended
December 31, 1997.


(2)   NEW ACCOUNTING STANDARD

     As of January 1, 1998, the Company adopted Financial Accounting Standard
("FAS") No. 130, Reporting Comprehensive Income. This statement establishes
standards for the reporting and presentation of comprehensive income and its
components in a full set of financial statements. Comprehensive income
encompasses all changes in stockholders' equity (except those arising from
transactions with shareholders) and includes net income, net unrealized capital
gains or losses on available-for-sale securities and foreign currency
translation adjustments.  As this new standard only requires additional
information in the financial statements, it does not affect the Company's
financial position or results of operations.
<PAGE>
 
                  Ambac Assurance Corporation and Subsidiaries
                           Consolidated Balance Sheets
                       June 30, 1998 and December 31, 1997
                    (Dollars in Thousands Except Share Data)

<TABLE>
<CAPTION>


                                                                                    June 30, 1998                  December 31, 1997
                                                                                -----------------------    -------------------------
                                                                                     (unaudited)

                                    ASSETS

Investments:
       Fixed income securities, at fair value
<S>                                                                                         <C>                          <C>       
           (amortized cost of $2,826,122 in 1998 and $2,696,603 in 1997)                    $3,017,130                   $2,878,083
       Short-term investments, at cost (approximates fair value)                               158,772                      116,905
                                                                                -----------------------    -------------------------
           Total investments                                                                 3,175,902                    2,994,988

Cash                                                                                            21,893                        8,004
Securities purchased under agreements to resell                                                      -                        2,484
Receivable for securities sold                                                                  10,068                       24,018
Investment income due and accrued                                                               50,973                       49,987
Deferred acquisition costs                                                                     110,973                      105,996
Receivable from brokers and dealers                                                            183,192                      183,041
Reinsurance recoverable                                                                          4,119                        4,219
Prepaid reinsurance                                                                            202,265                      183,492
Other assets                                                                                   147,586                       90,785
                                                                                -----------------------    -------------------------
           Total assets                                                                     $3,906,971                   $3,647,014
                                                                                =======================    =========================

                     LIABILITIES AND STOCKHOLDER'S EQUITY

Liabilities:
       Unearned premiums                                                                    $1,228,099                   $1,184,537
       Losses and loss adjustment expenses                                                     112,651                      103,345
       Ceded reinsurance balances payable                                                        7,878                        9,258
       Deferred income taxes                                                                   127,985                      122,554
       Current income taxes                                                                     13,080                       19,714
       Accounts payable and other liabilities                                                  157,791                      111,624
       Payable for securities purchased                                                        237,591                      195,388
                                                                                -----------------------    -------------------------
           Total liabilities                                                                 1,885,075                    1,746,420
                                                                                -----------------------    -------------------------

Stockholder's equity:
       Preferred stock, par value $1,000.00 per share; authorized
           shares - 285,000; issued and outstanding shares - none                                  -                            -
       Common stock, par value $2.50 per share; authorized shares
           - 40,000,000; issued and outstanding shares - 32,800,000
           at June 30, 1998 and December 31, 1997                                               82,000                       82,000
       Additional paid-in capital                                                              525,937                      521,153
       Accumulated other comprehensive income                                                  124,486                      118,119
       Retained earnings                                                                     1,289,473                    1,179,322
                                                                                -----------------------    -------------------------
           Total stockholder's equity                                                        2,021,896                    1,900,594
                                                                                -----------------------    -------------------------
           Total liabilities and stockholder's equity                                       $3,906,971                   $3,647,014
                                                                                =======================    =========================

</TABLE>



     See accompanying Notes to Consolidated Unaudited Financial Statements.





<PAGE>
 
                  Ambac Assurance Corporation and Subsidiaries
                      Consolidated Statements of Operations
                                   (Unaudited)
                  For The Periods Ended June 30, 1998 and 1997
                             (Dollars in Thousands)


<TABLE>
<CAPTION>

                                                           Three Months Ended                        Six Months Ended            
                                                                June 30,                                 June 30,                
                                                   ------------------------------------     ------------------------------------ 
                                                        1998                 1997                1998                1997        
                                                   ----------------     ---------------     ----------------    ---------------- 
                                                                                                                                 
Revenues:                                                                                                                        
                                                                                                                                 
<S>                                                        <C>                 <C>                 <C>                 <C>       
    Gross premiums written                                 $88,975             $74,593             $168,596            $126,763  
    Ceded premiums written                                 (10,048)             (7,195)             (36,135)            (12,627) 
                                                   ----------------     ---------------     ----------------    ---------------- 
          Net premiums written                              78,927              67,398              132,461             114,136  
                                                                                                                                 
    Increase in unearned premiums, net                     (25,038)            (30,595)             (24,742)            (39,883) 
                                                   ----------------     ---------------     ----------------    ---------------- 
          Net premiums earned                               53,889              36,803              107,719              74,253  
                                                                                                                                 
    Net investment income                                   45,939              39,363               91,075              77,894  
    Net realized (losses) gains                             (6,943)              3,479               (6,793)              4,291  
    Other income                                             5,337               3,331               12,660               6,316  
                                                   ----------------     ---------------     ----------------    ---------------- 
         Total revenues                                     98,222              82,976              204,661             162,754  
                                                   ----------------     ---------------     ----------------    ---------------- 
                                                                                                                                 
Expenses:                                                                                                                        
                                                                                                                                 
    Losses and loss adjustment expenses                      1,423                 664                3,000               1,392  
    Underwriting and operating expenses                     12,624              10,763               26,172              21,817  
    Interest expense                                           661                 565                1,422               1,130  
                                                   ----------------     ---------------     ----------------    ---------------- 
         Total expenses                                     14,708              11,992               30,594              24,339  
                                                   ----------------     ---------------     ----------------    ---------------- 
                                                                                                                                 
    Income before income taxes                              83,514              70,984              174,067             138,415  
                                                                                                                                 
    Provision for income taxes                              18,087              15,434               39,916              29,792  
                                                   ----------------     ---------------     ----------------    ---------------- 
                                                                                                                                 
    Net income                                             $65,427             $55,550             $134,151            $108,623  
                                                   ================     ===============     ================    ================ 


</TABLE>



          See accompanying Notes to Consolidated Financial Statements





<PAGE>
 
                  Ambac Assurance Corporation and Subsidiaries
                 Consolidated Statements of Stockholders' Equity
                                   (Unaudited)
                  For the Periods Ended June 30, 1998 and 1997
                             (Dollars in Thousands)

<TABLE>
<CAPTION>

                                                                              1998                               1997
                                                                 --------------------------------   --------------------------------

Retained Earnings:
<S>                                                                   <C>                                  <C>     
       Balance at January 1                                           $1,179,322                           $991,815
       Net income                                                        134,151        $134,151            108,623        $108,623
                                                                                 ----------------                   ----------------
       Dividends declared - common stock                                 (24,000)                           (22,000)
       Other                                                                   -                                 23
                                                                 ----------------                   ----------------
       Balance at June 30                                             $1,289,473                         $1,078,461
                                                                 ----------------                   ----------------

Accumulated Other Comprehensive Income:
       Balance at January 1                                             $118,119                            $65,822
       Unrealized gains (losses) on securities, $9,529 pre-tax                             6,194                             (1,699)
         and ($2,614) pre-tax in 1998 and 1997, respectively (1)
       Foreign currency                                                                      173                                397
                                                                                 ----------------                   ----------------
       Other comprehensive loss                                            6,367           6,367             (1,302)         (1,302)
                                                                 --------------------------------   --------------------------------
       Comprehensive income                                                             $140,518                           $107,321
                                                                                 ================                   ================
       Balance at June 30                                               $124,486                            $64,520
                                                                 ----------------                   ----------------

Preferred Stock:
       Balance at January 1 and June 30                                       $-                                 $-
                                                                 ----------------                   ----------------

Common Stock:
       Balance at January 1 and June 30                                  $82,000                            $82,000
                                                                 ----------------                   ----------------

Additional Paid-in Capital:
       Balance at January 1                                             $521,153                           $515,684
       Capital contribution                                                    -                              1,475
       Exercise of stock options                                           4,784                              3,222
                                                                 ----------------                   ----------------
       Balance at June 30                                               $525,937                           $520,381
                                                                 ----------------                   ----------------


Total Stockholders' Equity at June 30                                 $2,021,896                         $1,745,362
                                                                 ================                   ================

(1) Disclosure of reclassification amount:
Unrealized holding gains arising during period                            $6,626                               $380
Less: reclassification adjustment for gains
    included in net income                                                   432                              2,079
                                                                 ----------------                   ----------------
Net unrealized gains (losses) on securities                               $6,194                            ($1,699)
                                                                 ================                   ================

</TABLE>

          See accompanying Notes to Consolidated Financial Statements.

<PAGE>
 
                  Ambac Assurance Corporation and Subsidiaries
                      Consolidated Statements of Cash Flows
                                   (Unaudited)
                  For The Periods Ended June 30, 1998 and 1997
                             (Dollars in Thousands)


<TABLE> 
<CAPTION> 
                                                                                  Six Months Ended
                                                                                      June 30,
                                                                          ----------------------------------
                                                                               1998               1997
                                                                          ---------------    ---------------


Cash flows from operating activities:
<S>                                                                             <C>                <C>     
     Net income                                                                 $134,151           $108,623
     Adjustments to reconcile net income to net cash
            provided by operating activities:
     Depreciation and amortization                                                   792                871
     Amortization of bond premium and discount                                      (351)              (591)
     Current income taxes                                                         (6,634)            (1,649)
     Deferred income taxes                                                         2,096              5,667
     Deferred acquisition costs                                                   (4,977)            (7,179)
     Unearned premiums                                                            24,789             39,896
     Losses and loss adjustment expenses                                           9,306                821
     Ceded reinsurance balances payable                                           (1,380)             4,285
     Loss (gain) on sales of investments                                           6,793             (4,291)
     Accounts payable and other liabilities                                       46,167             (6,780)
     Other, net                                                                  (53,696)             2,464
                                                                          ---------------    ---------------
            Net cash provided by operating activities                            157,056            142,137
                                                                          ---------------    ---------------

Cash flows from investing activities:
     Proceeds from sales of bonds at amortized cost                              471,056            711,775
     Proceeds from maturities of bonds at amortized cost                          47,080             55,411
     Purchases of bonds at amortized cost                                       (590,082)          (880,479)
     Change in short-term investments                                            (41,867)            (7,166)
     Securities purchased under agreements to resell                               2,484               (463)
     Other, net                                                                   (7,838)               106
                                                                          ---------------    ---------------
            Net cash used in investing activities                               (119,167)          (120,816)
                                                                          ---------------    ---------------

Cash flows from financing activities:
     Dividends paid                                                              (24,000)           (22,000)
                                                                          ---------------    ---------------
            Net cash used in financing activities                                (24,000)           (22,000)
                                                                          ---------------    ---------------

            Net cash flow                                                         13,889               (679)
Cash at January 1                                                                  8,004              5,025
                                                                          ---------------    ---------------
Cash at June 30                                                                  $21,893             $4,346
                                                                          ===============    ===============

Supplemental disclosure of cash flow information:
     Cash paid during the year for:
            Income taxes                                                         $39,700            $22,600
                                                                          ===============    ===============

</TABLE>



     See accompanying Notes to Consolidated Unaudited Financial Statements.






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