CN BIOSCIENCES INC
8-K/A, 1998-03-12
MEDICINAL CHEMICALS & BOTANICAL PRODUCTS
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<PAGE>   1
                       Securities and Exchange Commission

                             Washington, D.C. 20549



                                   Form 8-K/A

                                 Amendment No. 2

                                 Current Report

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



       Date of Report (Date of earliest event reported) December 27, 1997

                              CN Biosciences, Inc.
             (Exact name of registrant as specified in its charter)

Delaware                        000-21281                  33-0509785
(State or other                 (Commission                (IRS Employer
jurisdiction of                 File Number)               Identification No.)
incorporation)


                 10394 Pacific Center Court, San Diego, CA 92121
               (Address of principal executive offices) (Zip Code)

       Registrant's Telephone Number, including area code: (619) 450-5500



                                       N/A
          (Former name or former address, if changed since last report)



<PAGE>   2

Item 2.  Acquisition or Disposition of Assets.

Effective as of December 27, 1997, CN Biosciences, Inc. (the "Registrant")
acquired all of the outstanding capital stock of Pel-Freez, Inc., an Arkansas
corporation ("Pel-Freez"), and all of the outstanding capital stock of
Pel-Freez's subsidiary Novagen, Inc., an Arkansas corporation ("Novagen"),
pursuant to a Stock Purchase Agreement, dated as of November 25, 1997, by and
among the Registrant, as Buyer, David W. Dubbell, Dennis Almond, Corrine
Fetherston, Lisa Johnson, Robert Mierendorf, Warren Kroeker, Barbara Morris,
Robert Novy and Tom Van Oosbree, as Sellers, and Pel-Freez for $10,500,000 cash.
On January 2, 1998, the Registrant paid the purchase price from cash on hand.
The purchase price was determined through arm's length negotiation between the
Registrant and the Sellers. Subsequent to the closing of the acquisition of
Pel-Freez and Novagen by the Registrant, Pel-Freez's Articles of Incorporation
were amended to change its name to Novagen Holdings, Inc.

Item 7.  Financial Statements and Exhibits.

(a)     Financial statements of business acquired.

Report of Coopers & Lybrand, L.L.P., Independent Accountants

Consolidated Balance Sheet of Novagen Holdings, Inc. (formerly Pel-Freez, Inc.)
as of December 27, 1997

Consolidated Statement of Income of Novagen Holdings, Inc. (formerly Pel-Freez,
Inc.) for the Year Ended December 27, 1997

Consolidated Statement of Stockholder's Equity of Novagen Holdings, Inc.
(formerly Pel-Freez, Inc.) for the Year Ended December 27, 1997

Consolidated Statement of Cash Flows of Novagen Holdings, Inc. (formerly
Pel-Freez, Inc.) for the Year Ended December 27, 1997

Notes to Consolidated Financial Statements

(b)     Pro forma financial information.

Pro Forma Condensed Combined Balance Sheet as of December 31, 1997 (unaudited)

Pro Forma Condensed Combined Statement of Operations for the Year Ended December
31, 1997 (unaudited)

Notes to the Unaudited Condensed Combined Pro Forma Financial Information



                                      -2-
<PAGE>   3

(c)     Exhibits.

Exhibit No.            Description

2(b)                   Stock Purchase Agreement, dated as of November 25, 1997,
                       by and among CN Biosciences, Inc., as Buyer, David W.
                       Dubbell, Dennis Almond, Corrine Fetherston, Lisa Johnson,
                       Robert Mierendorf, Warren Kroeker, Barbara Morris, Robert
                       Novy and Tom Van Oosbree, as Sellers, and Pel-Freez,
                       Inc.*

23(a)                  Consent of Coopers & Lybrand, L.L.P.


- ----------
*Incorporated by reference to Amendment No. 1 to this Current Report on Form
 8-K, filed by the Registrant on February 3, 1998.



                                       -3-
<PAGE>   4

Item 7(a) Financial statements of business acquired.

                        REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors

Pel-Freez, Inc.

        We have audited the accompanying consolidated balance sheet of
Pel-Freez, Inc. and Subsidiary (the "Company") as of December 27, 1997 and the
related consolidated statement of income, stockholder's equity, and cash flows
for the year then ended. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audit.

        We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

        In our opinion, the financial statements referred to above present
fairly, in all material respects, the consolidated financial position of
Pel-Freez, Inc. and Subsidiary as of December 27, 1997, and the consolidated
results of their operations and their cash flows for the year then ended, in
conformity with generally accepted accounting principles.

        As discussed in Note 1, on January 1, 1998, the Company was
restructured, resulting in a change in reporting entity, which has been
reflected in the accompanying financial statements.



COOPERS & LYBRAND L.L.P.

Tulsa, Oklahoma

February 19, 1998



                                      -4-
<PAGE>   5


                                 PEL-FREEZ, INC.

                           CONSOLIDATED BALANCE SHEET

                                December 27, 1997


<TABLE>
                                    ASSETS
<S>                                                                  <C>    
   Current assets:
       Cash                                                          $64,702
       Accounts receivable                                           512,994
       Capital contribution receivable                               107,700
       Income tax receivable                                         650,000
       Inventories                                                   598,664
       Prepaid expenses and other assets                              81,632
       Deferred income taxes                                         128,895
                                                           ------------------
   Total current assets                                            2,144,587
                                                           ------------------
   Property and equipment, net                                       469,430
                                                           ------------------
   Deferred income taxes and other assets                             71,162
                                                           ------------------
   Total assets                                                   $2,685,179
                                                           ------------------

                     LIABILITIES AND STOCKHOLDER'S EQUITY
   Current liabilities:
       Accounts payable                                              443,025
       Accrued liabilities                                           601,786
       Payable to shareholder                                        650,000
                                                           ------------------
   Total current liabilities                                       1,694,811
                                                           ------------------
   Other liabilities                                                 250,000
   Payable to affiliate                                               99,226
   Minority interest                                                  64,762
   Commitments (Note 5)
   Stockholder's equity:
       Common stock, $.01 par value; authorized                        4,272
       1,000,000 shares; issued and outstanding 427,200
       shares
   Retained earnings                                                 572,108
                                                           ------------------
                                                                     576,380
                                                           ------------------
   Total liabilities and stockholders' equity                      2,685,179
                                                           ==================
</TABLE>



                     The accompanying notes are an integral
                 part of the consolidated financial statements.



                                      -5-
<PAGE>   6

                                 PEL-FREEZ, INC.

                        CONSOLIDATED STATEMENT OF INCOME

                      For the Year Ended December 27, 1997




<TABLE>

<S>                                                           <C>        
    Net sales                                                 $ 4,213,932
    Cost of sales                                               1,163,068
                                                              -----------
    Gross profit                                                3,050,864
                                                              -----------
    Operating expenses:
       Selling                                                  1,078,131
       Research and development                                   418,801
       General and administrative
                                                                1,519,632
                                                              -----------
                                                                3,016,564
                                                              -----------
     Income from operations                                        34,300
                                                              -----------
       Other income (expense):
       Interest income                                                 21
       Interest expense                                           (22,720)
       Other                                                     (517,239)
                                                              -----------
                                                                 (539,938)
                                                              -----------
       Income before income taxes and minority interest          (505,638)
     Income tax benefit                                           212,578
     Minority interest                                             27,875
                                                              -----------
     Net loss                                                 $  (265,185)
                                                              -----------
</TABLE>


                     The accompanying notes are an integral
                 part of the consolidated financial statements.



                                      -6-
<PAGE>   7

                                 PEL-FREEZ, INC.



                 CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY



                      For the Year Ended December 27, 1997





<TABLE>
<CAPTION>
                                                 Common Stock              Retained
                                           Shares           Amount         Earnings         Total
                                         -----------     -----------     -----------     -----------
<S>                                          <C>         <C>             <C>             <C>        
    Balance, December 28,
       1996, as previously
       reported                              480,000     $     4,800     $ 4,721,050     $ 4,725,850


       Adjustment for change in
       reporting entity and
       recording of minority interest        (52,800)    $      (528)     (4,053,457)     (4,053,985)
                                         -----------     -----------     -----------     -----------

       Balance, December 28,
       1996, as restated                     427,200     $     4,272         667,593         671,865

       Capital contribution                     --              --           169,700         169,700

       Net loss                                 --              --          (265,185)       (265,185)
                                         -----------     -----------     -----------     -----------

    Balance, December 27,
       1997                                  427,200     $     4,272     $   572,108     $   576,380
                                         ===========     ===========     ===========     ===========
</TABLE>



                     The accompanying notes are an integral
                 part of the consolidated financial statements.



                                      -7-
<PAGE>   8

                                 PEL-FREEZ, INC.

                      CONSOLIDATED STATEMENT OF CASH FLOWS

                      For the Year Ended December 27, 1997

<TABLE>
<S>                                                            <C>       
         Cash flows from operating activities:
             Net loss                                          $(265,185)
             Adjustments to reconcile net loss to net cash
               provided by operating activities:
                   Depreciation                                  146,409
                   Loss on sale of equipment                         141
                   Minority interest                             (27,875)
                   Other non-cash expenses                       117,098
                   Deferred income taxes                        (241,675)
             Changes in:
               Accounts receivable                               (42,222)
               Inventories                                      (154,111)
               Prepaid expenses and other assets                 (30,632)
               Accounts payable and accrued expenses             573,350
               Other liabilities                                 250,000
               Payable to affiliate                             (221,389)
                                                               ---------

             Net cash provided by operating activities           103,909
                                                               ---------

          Cash flows from investing activities:
             Purchase of property and equipment                  (51,863)
                                                               ---------

          Cash flows from financing activities:
             Purchase and retirement of stock of subsidiary       (7,500)
                                                               ---------

          Increase (decrease) in cash                             44,546

          Cash, beginning of year                                 20,156
                                                               ---------

          Cash, end of year                                    $  64,702
                                                               =========

    Non-cash activity:

          Receivable for capital contribution                  $ 107,700
                                                               ---------
          Property and equipment acquired from affiliates      $  70,558
                                                               =========
</TABLE>



                     The accompanying notes are an integral
                 part of the consolidated financial statements.



                                      -8-
<PAGE>   9


                                 PEL-FREEZ, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.      RESTRUCTURING

                Prior to the restructuring described below the consolidated
        financial statements of Pel-Freez, Inc. ("Pel-Freez") (a holding
        company) included the financial position and results of operations of an
        90%-owned subsidiary, Novagen, Inc. ("Novagen"), and the wholly-owned
        subsidiaries Tri-State Industrials, Inc. ("Tri-State") and Pel-Freez
        Rabbit Meat, Inc. ("PFRM"). On January 1, 1998, the stockholder of
        Pel-Freez effected a restructuring whereby Pel-Freez acquired from its
        sole stockholder 52,800 shares of its common stock in exchange for all
        of the issued and outstanding common stock of Tri-State, thus
        establishing two companies under common control. Immediately prior to
        the redemption transaction, Pel-Freez contributed all of the issued and
        outstanding common stock of PFRM to Tri-State, which resulted in PFRM
        becoming a wholly-owned subsidiary of Tri-State. Novagen and
        Tri-State/PFRM are in dissimilar businesses. Novagen is involved in the
        research and development, manufacture and marketing of integrated
        protein expression systems and reagents whose customers are primarily
        involved in research and biotechnology. PFRM is a food processing
        company specializing in rabbit meat processing and rabbit bi-products.
        There are nominal sales between Novagen and PFRM. Novagen and
        Tri-State/PFRM have been managed and financed historically as if they
        were autonomous, including a separate management team, sales, accounting
        and administrative staff. They have no common facilities and only share
        limited corporate level costs. The two companies will continue to be
        operated and financed autonomously after the restructuring and will not
        have material financial commitments, guarantees or contingent
        liabilities to each other after the restructuring. For financial
        reporting purposes, the redemption transaction was effectively a
        reorganization of entities under common control and has been reflected
        as a change in reporting entity. Accordingly, the 1997 consolidated
        financial statements include only the accounts of Pel-Freez and Novagen
        and give affect to the restructuring as if it had occurred on December
        28, 1996. In connection with the restructuring, the outstanding
        long-term debt, certain other liabilities and notes receivable from
        officers were effectively assigned to PFRM, which subsequently
        extinguished substantially all of the debt. Retained earnings at
        December 28, 1996, have also been reduced by $83,000 to reflect the
        recording of the minority interest which had not previously been
        recorded.

                Effective December 27, 1997, the sole shareholder sold all of
        the issued and outstanding common stock of Pel-Freez to CN Biosciences,
        Inc. ("CNB").

2.      NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

        PRINCIPLES OF CONSOLIDATION - The consolidated financial statements
        include the accounts of Pel-Freez and its 90%-owned subsidiary, Novagen
        (collectively, the "Company").



                                      -9-
<PAGE>   10

2.      NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING

        POLICIES, Continued

        NATURE OF OPERATIONS - Novagen, Inc. is involved in the research and
        development, manufacturing and marketing of integrated protein
        expression systems and reagents. Novagen, Inc. extends credit to
        worldwide customers who are in the following fields: biotechnological
        reagents and kits, biotechnological medical and life science research
        and pharmaceuticals.

        USE OF ESTIMATES - The preparation of financial statements in conformity
        with generally accepted accounting principles requires management to
        make estimates and assumptions that affect the reported amounts of
        assets and liabilities and disclosure of contingent assets and
        liabilities at the date of the financial statements and the reported
        amounts of revenues and expenses during the reporting period. Actual
        results could differ from those estimates.

        FISCAL YEAR - The Company's fiscal year ends on the Saturday closest to
        December 31. The year ended December 27, 1997 consists of 52 weeks.

        CASH EQUIVALENTS - The Company considers all highly liquid debt
        instruments, with a maturity of three months or less when purchased, to
        be cash equivalents.

        INVENTORIES - Inventories are stated at the lower of cost or market. The
        Company uses standard costing procedures which approximate the first-in,
        first-out inventory method.

        PROPERTY AND EQUIPMENT - Property and equipment are carried at cost and
        are depreciated over their estimated useful lives (from 5 to 7 years)
        using the straight-line method.

        RESEARCH AND DEVELOPMENT COSTS - Expenditures relating to the
        development of new processes and the advancement of medical testing are
        expensed as incurred.

        INCOME TAXES - The Company follows Statement of Financial Accounting
        Standards No. 109, "Accounting for Income Taxes" ("SFAS No. 109"). SFAS
        No. 109 requires the measurement of deferred tax assets for deductible
        temporary differences and operating loss carryforwards, and of deferred
        tax liabilities for taxable temporary differences. Measurement of
        current and deferred tax liabilities and assets is based on provisions
        of enacted tax law; the effects of future changes in tax laws or rates
        are not included in the measurement. Valuation allowances are
        established when necessary to reduce deferred tax



                                      -10-
<PAGE>   11

2.      NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING
        POLICIES, Continued

        assets to the amount expected to be realized. Income tax expense
        (benefit) is the tax payable (receivable) for the period and the change
        during the period in deferred tax assets and liabilities.

3.      INVENTORIES

               Inventories consist of the following at December 27, 1997:

<TABLE>
<S>                                         <C>     
                    Raw materials           $240,265
                    Finished goods           358,399
                                            --------

                                            $598,664
                                            ========
</TABLE>

4.  PROPERTY AND EQUIPMENT



               Property and equipment consist of the following at December 27,
               1997:

<TABLE>
<S>                                                               <C>       
                    Buildings and leasehold improvements          $  147,355
                    Machinery and equipment                          708,151
                    Furniture and fixtures                           335,678
                                                                  ----------

                                                                   1,191,184

                    Less accumulated depreciation                    721,754
                                                                  ----------

                                                                  $  469,430
                                                                  ==========
</TABLE>

5.      OPERATING LEASES

               Noncancelable operating leases for a laboratory and certain
        production and administration facilities expire in various years through
        2001. Rent expense for the year ended December 27, 1997, approximated
        $272,424.

               Future minimum lease payments at December 27, 1997 were:

<TABLE>
<S>                                              <C>       
                    1998                         $  214,050
                    1999                            222,612
                    2000                            231,516
                    2001                            220,712
                                                 ----------
                                                 $  888,890
                                                 ==========
</TABLE>



                                      -11-
<PAGE>   12

6.      INCOME TAXES

               The Company files a consolidated federal income tax return which
        includes Novagen, Tri-State and PFRM. As a result of the consolidated
        group incurring a pre-tax loss in 1997, Pel-Freez has recorded an income
        tax receivable, resulting from the carryback of the loss . In accordance
        with the terms of the stock purchase agreement between the stockholder
        and CNB, the income tax refund, when received by Pel-Freez, will be
        distributed to the stockholder.

               The provision for income taxes includes these components at
December 27, 1997:

<TABLE>
<S>                                                  <C>      
                    Current income taxes             $  29,097
                    Deferred income benefit           (241,675)
                                                     ---------
                                                     $(212,578)
                                                     =========
</TABLE>


        The tax effects of temporary differences related to deferred taxes shown
        on the balance sheets were:


<TABLE>
<S>                                                                    <C>      
                    Deferred tax asset - current:
                      Inventory overhead cost capitalized for
                      tax purposes                                     $  16,819
                      Accrued compensated absences                         8,897
                      Accrued pension liability                            5,144
                      Accrued litigation settlement                       98,035
                                                                       ---------

                      Deferred tax asset - current                     $ 128,895
                                                                       =========

                    Deferred tax asset - noncurrent:
                      Accrued litigation settlement                    $  98,035
                      Accumulated depreciation
                                                                         (47,601)
                                                                       ---------

                      Deferred tax asset - noncurrent                  $  50,434
                                                                       =========
</TABLE>


A reconciliation of income tax expense at the statutory rate to the Company's
actual income tax expense at December 27, 1997:



<TABLE>
<S>                                                                    <C>       
                    Computed at the statutory rate (34%)               $(171,917)
                    Increase (decrease) resulting from:
                      Research and development tax credit                (23,995)
                      State income taxes - net of federal tax
                                                                         (26,364)
                      Other                                                9,698
                                                                       ---------

                    Actual tax benefit                                 $(212,578)
                                                                       =========
</TABLE>



                                      -12-
<PAGE>   13

7.      PENSION AND PROFIT SHARING PLANS

        PENSION PLAN - Through fiscal year 1997, the Company was the sponsor of
        a defined benefit pension plan covering substantially all employees. On
        January 1, 1998, the plan sponsorship and all of the related obligations
        were transferred to PFRM. Effective December 27, 1997, and concurrent
        with the transfer of plan sponsorship, the future benefits of all
        employees of the Company were frozen, as the Company will no longer
        participate in this defined benefit plan. For 1997, the Company accrued
        approximately $13,000 for this pension liability, which has been
        recorded as a payable to affiliate.

        PROFIT SHARING PLAN - The Company has a defined contribution retirement
        plan, established under the regulations of Internal Revenue Code Section
        401(k), covering substantially all employees. The Company contributes an
        amount equal to 50% of the first 6% of elective deferrals made by
        employees. In addition, the Company may contribute additional amounts,
        as determined by the Board of Directors, not to exceed the maximum
        amount deductible for income tax purposes. Participants vest in Company
        contributions over a period from 2 to 6 years of service. Contributions
        to the Plan were approximately $27,000 for the year ended December 27,
        1997. As part of the reorganization of the Company, plan sponsorship for
        the profit sharing plan was assumed by PFRM.

8.      OTHER EMPLOYEE BENEFIT PLANS

               The Company had a stock option plan whereby ten percent of the
        presently authorized common shares were reserved for issuance upon
        exercise of options granted to certain employees. The Plan provided that
        the option price be no less than the estimated fair value of the stock
        at the date of grant. Options granted vested over five years and became
        exercisable immediately upon vesting. Options expired 15 years after the
        date of grant. Under the terms of the Company's Shareholders' Agreement,
        shareholders could not sell, exchange, assign or otherwise encumber any
        shares owned, except under certain circumstances. Additionally, the
        Company had right of first refusal to purchase any shares placed for
        sale at a price that approximated fair value. In connection with the
        restructuring, all outstanding options were terminated. In connection
        with the restructuring, the cost of terminating the options was recorded
        by PFRM for all option holders most of whom were employees of PFRM. The
        cost, net of related income taxes, of terminating options held by an
        employee of Novagen was recorded by Novagen as a capital contribution.




                                      -13-
<PAGE>   14

8.      OTHER EMPLOYEE BENEFIT PLANS, Continued

               The Company is self-insured through an affiliate for medical
        benefits provided to employees. The Company funds medical claims by
        periodic contributions, through payments to an affiliate, to a Voluntary
        Employee's Beneficiary Association Trust which approximates the
        liability for claims currently payable and incurred but not reported.
        The Company accrued $67,557 in 1997 for medical claims which are
        included in the payable to affiliate.

9.      SETTLEMENT OF LITIGATION

               In 1996, certain litigation was instituted against Novagen
        claiming patent infringement. On March 20, 1997, the court found that
        the claims related to the patents that covered Novagen's product were
        invalid and, accordingly management and legal counsel determined that it
        was remote that Novagen would incur any liability relating to this
        litigation. Upon appeal by the plaintiff, this verdict was reversed in
        1997. In January 1998, Novagen entered into a settlement agreement with
        the plaintiff whereby it agreed to pay $500,000, which has been included
        in other expense and accrued liabilities in the accompanying financial
        statements.



                                      -14-
<PAGE>   15

Item 7(b) Pro forma financial information.


          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

The following unaudited pro forma condensed combined financial information has
been prepared giving effect to the Company's acquisition of Novagen Holdings,
Inc. ("Holdings"), and its subsidiary Novagen, Inc. ("Novagen"), as if the
transaction had taken place at December 31, 1997 for the pro forma condensed
combined balance sheet and January 1, 1997 for the pro forma condensed combined
statement of operations.

The acquisition was accomplished through the purchase of all outstanding common
stock of Holdings, which owned 90% of the outstanding common stock of Novagen,
and the purchase of the remaining 10% of the outstanding common stock of
Novagen, from their respective shareholders. Prior to its acquisition by the
Company, Holdings operated two other businesses through separate subsidiaries.
As a condition of the stock purchase agreement pursuant to which the Company
acquired Holdings and Novagen, Holdings divested itself of these subsidiaries.
Consequently, upon the consummation of the Company's acquisition of Holdings,
its assets consisted only of its stock of Novagen and certain tax assets, while
its liabilities consisted only of certain related tax liabilities.

The unaudited pro forma condensed combined financial information has been
derived from the audited consolidated financial statements of the Company and
Holdings and should be read in conjunction with such audited financial
statements and the notes thereto. The pro forma financial information is not
necessarily indicative of the results of operations or the financial position
which would have been attained had the acquisition been consummated on either of
the foregoing dates or that which may be attained in the future.



                                      -15-
<PAGE>   16

              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
                                DECEMBER 31, 1997
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
ASSETS
                                                         CN                    PRO FORMA
                                                  BIOSCIENCES, INC.            ADJUSTMENTS                 COMBINED
                                                  -----------------         -----------------         -----------------
<S>                                               <C>                       <C>                       <C>              
Current assets:
    Cash and cash equivalents                     $          15,646         $         (10,500)        $           5,146
    Short-term investments                                    2,046                      --                       2,046
    Accounts receivable                                       5,914                      --                       5,914
    Inventories                                              18,309                      --                      18,309
    Other current assets                                      2,800                      --                       2,800
                                                  -----------------         -----------------         -----------------
Total current assets                                         44,715                      --                      34,215

Property and equipment, net                                   4,528                      --                       4,528
Intangible assets, net                                       10,330                      --                      10,330
Other assets                                                    838                      --                         838
                                                  -----------------         -----------------         -----------------
Total assets                                      $          60,411         $         (10,500)        $          49,911
                                                  =================         =================         =================

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable, trade                         $           2,505                      --           $           2,505
  Liability for purchase of
    business                                                 10,500                   (10,500)                     --
  Accrued expenses                                            3,898                      --                       3,898
  Other current liabilities                                     837                      --                         837
                                                  -----------------         -----------------         -----------------
Total current liabilities                                    17,740                   (10,500)                    7,240

Other liabilities                                               857                      --                         857
Deferred tax liabilities                                      2,708                      --                       2,708

Stockholders' equity:
  Preferred stock                                              --                        --                        --
  Common stock                                                   56                      --                          56
  Additional paid-in capital                                 42,481                      --                      42,481
  Accumulated deficit                                        (3,043)                     --                      (3,043)
  Foreign currency translation                                 (388)                     --                        (388)
                                                  -----------------         -----------------         -----------------
Total stockholders' equity                                   39,106                      --                      39,106
                                                  -----------------         -----------------         -----------------
Total liabilities and stockholders' equity        $          60,411         $         (10,500)        $          49,911
                                                  =================         =================         =================
</TABLE>



  See accompanying notes.



                                      -16-
<PAGE>   17

         UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                          YEAR ENDED DECEMBER 31, 1997
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)


<TABLE>
<CAPTION>
                                              CN            NOVAGEN
                                         BIOSCIENCES,       HOLDINGS,       PRO FORMA 
                                             INC.             INC.         ADJUSTMENTS        COMBINED
                                         -----------      -----------      -----------      -----------
<S>                                      <C>              <C>              <C>              <C>        
Sales                                    $    39,445      $     4,214      $      --        $    43,659
Cost of sales                                 17,883            1,163             --             19,046
                                         -----------      -----------      -----------      -----------
Gross profit                                  21,562            3,051             --             24,613
Operating expenses:
  Selling, general and
    administrative                            13,871            3,115             (354)          17,340
  Research and development                     2,567              419             --              2,986
  Write off of in-process technology           6,800             --              6,800             --
                                         -----------      -----------      -----------      -----------
Total operating expenses                      23,238            3,534            6,446           20,326
                                         -----------      -----------      -----------      -----------
Income (loss) from operations                 (1,676)            (483)           6,446            4,287
 Interest income (expense), net                  594              (23)            --                571
                                         -----------      -----------      -----------      -----------
Income (loss) before income taxes             (1,082)            (506)           6,446            4,858
Income tax expense (benefit)                  (1,898)             213             --             (1,685)
Minority interest                               --                 28              (28)            --
                                         -----------      -----------      -----------      -----------
Net income (loss)                        $    (2,980)     $      (265)     $     6,418      $     3,173
                                         ===========      ===========      ===========      ===========

  Net income (loss) per share:
     Basic                               $      (.55)     $      --        $      --        $       .58
                                         ===========      ===========      ===========      ===========
     Diluted                             $      (.55)     $      --        $      --        $       .55
                                         ===========      ===========      ===========      ===========

  Shares used in per share
    computations:
     Basic                                 5,436,000                                          5,436,000
                                         ===========                                        ===========
     Diluted                               5,436,000                                          5,737,000
                                         ===========                                        ===========
</TABLE>

    See accompanying notes.



                                      -17-
<PAGE>   18

NOTES TO PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

1. On December 27, 1997, CN Biosciences, Inc. (the "Company") purchased all of
the outstanding capital stock of Novagen, Inc., and its parent holding company
Novagen Holdings, Inc., (formerly Pel Freez, Inc.)(hereinafter collectively
"Holdings") in a transaction accounted for as a purchase. The $10.5 million
purchase price was funded on January 2, 1998 from cash on hand. Accordingly, the
Company's audited balance sheet as of December 31, 1997 already gives effect to
the acquisition of Holdings except for the funding of the purchase price. The
assets acquired include identified intangible assets and goodwill of $5.9
million with an assumed amortization period of approximately 17 years, and in
process technology of $6.8 million which was written off effective with the
purchase.

2. The pro forma condensed combined balance sheet has been adjusted to reflect
the funding of the purchase price of $10.5 million in January 1998.

3. The pro forma condensed combined statement of operations combines the
Company's historical results for the year ended December 31, 1997 with Holdings'
historical results for the fiscal year ended December 27, 1997. The pro forma
condensed combined statement of operations has been adjusted to reflect (a)
additional amortization expense related to the intangible assets and goodwill
acquired; (b) exclusion of the charge for the write off of in-process technology
which was directly attributable to the transaction; and (c) exclusion of the
minority interest in Holdings' net loss for the fiscal year ended December 27,
1997.



                                      -18-
<PAGE>   19

                                   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 hereunto duly authorized.

                                            CN Biosciences, Inc.

                                            By:  /s/ James G. Stewart
                                               ---------------------------------
                                                  James G. Stewart
                                                  Chief Financial Officer, Vice
                                                  President-Administration and
                                                  Secretary

Dated:  March 12, 1998



                                      -19-
<PAGE>   20

                                  EXHIBIT INDEX



Exhibit No.           Description
- -----------           -----------

2(b)                  Stock Purchase Agreement, dated as of November 25, 1997,
                      by and among CN Biosciences, Inc., as Buyer, David W.
                      Dubbell, Dennis Almond, Corrine Fetherston, Lisa Johnson,
                      Robert Mierendorf, Warren Kroeker, Barbara Morris, Robert
                      Novy and Tom Van Oosbree, as Sellers, and Pel-Freez, Inc.*

23(a)                 Consent of Coopers & Lybrand, L.L.P.


- ----------

*Incorporated by reference to Amendment No. 1 to this Current Report on Form
 8-K, filed by the Registrant on February 3, 1998.



                                      -20-

<PAGE>   1

Exhibit 23(a)



                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


We consent to the inclusion in CN Biosciences, Inc.'s Form 8K/A, Amendment No. 2
(to be filed on or about March 12, 1998), which is incorporated by reference in
Forms S-8 (file numbers 333-32891 and 333-16527), of our report dated February
19, 1998, on our audit of the consolidated financial statements of Pel-Freez,
Inc. and Subsidiary as of and for the year ended December 27, 1997.



                                                       Coopers & Lybrand, L.L.P.



Tulsa, Oklahoma

March 10, 1998




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