CAMBREX CORP
SC 14D1/A, 1997-09-29
INDUSTRIAL ORGANIC CHEMICALS
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<PAGE>   1
 
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
   
                                AMENDMENT NO. 1
    
 
   
                                 SCHEDULE 14D-1
    
                             TENDER OFFER STATEMENT
                          PURSUANT TO SECTION 14(d)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                                      AND
 
                                  SCHEDULE 13D
                                     UNDER
                      THE SECURITIES EXCHANGE ACT OF 1934
 
                            ------------------------
 
                               BIOWHITTAKER, INC.
                       (NAME OF SUBJECT COMPANY (ISSUER))
 
                           BW ACQUISITION CORPORATION
                          A WHOLLY-OWNED SUBSIDIARY OF
 
                              CAMBREX CORPORATION
                                    (BIDDER)
 
<TABLE>
<S>                                       <C>
COMMON STOCK, PAR VALUE $0.01 PER SHARE                    09066T  108
        (AND ASSOCIATED RIGHTS)               (CUSIP NUMBER OF CLASS OF SECURITIES)
     (TITLE OF CLASS OF SECURITIES)
</TABLE>
 
                             PETER E. THAUER, ESQ.
 
                           BW ACQUISITION CORPORATION
                            C/O CAMBREX CORPORATION
                             ONE MEADOWLANDS PLAZA
                       EAST RUTHERFORD, NEW JERSEY 07073
                                 (201) 804-3000
            (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED
           TO RECEIVE NOTICES AND COMMUNICATIONS ON BEHALF OF BIDDER)
 
                                    COPY TO:
                             ANDREW L. SOMMER, ESQ.
                              DEBEVOISE & PLIMPTON
                                875 THIRD AVENUE
                            NEW YORK, NEW YORK 10022
                           TELEPHONE: (212) 909-6000
                            ------------------------
 
   
- --------------------------------------------------------------------------------
    
- --------------------------------------------------------------------------------
<PAGE>   2
 
   
<TABLE>
<S>                       <C>                                       <C>
- --------------------------
  CUSIP NO. 09066T  108
- --------------------------
  -----------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON:
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
    1       CAMBREX CORPORATION
            I.R.S. IDENTIFICATION NO. 22-2476135
  -----------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
              (SEE INSTRUCTIONS)                                                            (A) [
              ]
    2       (B)  [ ]
  -----------------------------------------------------------------------------------------------
            SEC USE ONLY
    3
  -----------------------------------------------------------------------------------------------
            SOURCES OF FUNDS (SEE INSTRUCTIONS)
    4
            BK
  -----------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    5       PURSUANT TO ITEMS 2(E) OR 2(F)                                                 [ ]
  -----------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
    6
            DELAWARE
  -----------------------------------------------------------------------------------------------
            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    7
            10,128,479 SHARES
  -----------------------------------------------------------------------------------------------
            CHECK IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES CERTAIN
    8       SHARES (SEE INSTRUCTIONS)                                                        [ ]
  -----------------------------------------------------------------------------------------------
            PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
    9       93.1%
  -----------------------------------------------------------------------------------------------
            TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
    10      CO
  -----------------------------------------------------------------------------------------------
</TABLE>
    
<PAGE>   3
 
   
<TABLE>
<S>                       <C>                                       <C>
- --------------------------
  CUSIP NO. 09066T  108
- --------------------------
 -----------------------------------------------------------------------------------------------
           NAME OF REPORTING PERSON:
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   1       BW ACQUISITION CORPORATION
           I.R.S. IDENTIFICATION NO. APPLIED FOR
 -----------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
             (SEE INSTRUCTIONS)                                                            (A) [
             ]
   2       (B)  [ ]
 -----------------------------------------------------------------------------------------------
           SEC USE ONLY
   3
 -----------------------------------------------------------------------------------------------
           SOURCES OF FUNDS (SEE INSTRUCTIONS)
   4
           BK
 -----------------------------------------------------------------------------------------------
           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   5       PURSUANT TO ITEMS 2(E) OR 2(F)                                                  [ ]
 -----------------------------------------------------------------------------------------------
           CITIZENSHIP OR PLACE OF ORGANIZATION
   6
           DELAWARE
 -----------------------------------------------------------------------------------------------
           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   7
           10,128,479
 -----------------------------------------------------------------------------------------------
           CHECK IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES CERTAIN
   8       SHARES (SEE INSTRUCTIONS)                                                        [ ]
 -----------------------------------------------------------------------------------------------
           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
   9       93.1%
 -----------------------------------------------------------------------------------------------
           TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   10      CO
 -----------------------------------------------------------------------------------------------
</TABLE>
    
<PAGE>   4
 
   
     BW Acquisition Corporation ('Purchaser') hereby amends and supplements its
Tender Offer Statement on Schedule 14D-1 (the "Statement"), originally filed on
August 28, 1997 with respect to its offer to purchase all outstanding shares of
common stock, par value $0.01 per share, of BioWhittaker, Inc. (the "Company"),
a Delaware corporation, and associated rights to purchase Series A Cumulative
Preferred Stock, par value $0.01 per share (together with the common stock, the
"Shares"), at a price of $11.625 per Share, net to the seller in cash.
    
 
ITEM 6.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY.
 
     Item 6 of this Statement is hereby amended and supplemented as follows:
 
   
     The Offer expired at 12:00 Midnight, New York City time, on Thursday,
September 25, 1997. According to the Depositary, based on a preliminary count,
there were validly tendered and not properly withdrawn approximately 10,128,479
Shares (including 166,514 Shares tendered by means of a Notice of Guaranteed
Delivery) as of the Expiration Date, representing approximately 93.1% of the
Shares currently outstanding. The Purchaser accepted for payment all Shares
validly tendered in accordance with the Offer.
    
 
     On September 25, 1997, Cambrex Corporation issued a press release, a copy
of which is attached hereto as Exhibit 11(a)(9) and is incorporated herein by
reference.
 
ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.
 
     Item 11 of this Schedule 14D-1 is hereby amended and supplemented by adding
the following text thereafter.
 
     (11)(a)(9) Press Release issued by Cambrex Corporation on September 25,
1997.
<PAGE>   5
 
                                   SIGNATURE
 
   
     After due inquiry and to the best of our knowledge and belief, we certify
that the information set forth in this Statement is true, complete and correct.
    
 
                                          BW ACQUISITION CORPORATION
 
   
                                          By: /s/ PETER E. THAUER
    
 
                                            ------------------------------------
   
                                            Name: Peter E. Thauer
    
   
                                            Title: Vice President
    
 
                                          CAMBREX CORPORATION
 
   
                                          By: /s/ PETER E. THAUER
    
 
                                            ------------------------------------
   
                                            Name: Peter E. Thauer
    
   
                                            Title: Vice President
    
 
   
Date: September 29, 1997
    
 
                                        2
<PAGE>   6
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
EXHIBIT
  NO.                                    DESCRIPTION                                 PAGE NO.
- --------   ------------------------------------------------------------------------  --------
<C>        <S>                                                                       <C>
11(a)(1)*  Offer to Purchase dated August 28, 1997.................................
11(a)(2)*  Letter of Transmittal...................................................
11(a)(3)*  Notice of Guaranteed Delivery...........................................
11(a)(4)*  Letter from the Dealer Manager to Brokers, Dealers, Commercial Banks,
           Trust Companies and Nominees............................................
11(a)(5)*  Letter to clients for use by Brokers, Dealers, Commercial Banks, Trust
           Companies and Nominees..................................................
11(a)(6)*  Guidelines for Certification of Taxpayer Identification Number on
           Substitute Form W-9.....................................................
11(a)(7)*  Summary Advertisement as published on August 28, 1997...................
11(a)(8)*  Joint Press Release issued by Parent and the Company on August 25,
           1997....................................................................
11(a)(9)   Press release issued by Cambrex Corporation on September 25, 1997.......
11(b)(1)*  Commitment Letter, dated as of August 20, 1997, as amended, by and among
           Parent and the financial institutions listed therein....................
11(c)(1)*  Agreement and Plan of Merger, dated as of August 22, 1997, among Parent,
           the Purchaser and the Company.
11(c)(2)*  Stockholders Agreement, dated as of August 22, 1997, between Parent and
           Anasco GmbH.............................................................
11(c)(3)*  Management Stockholders Agreement, dated as of August 22, 1997, among
           Parent and the stockholders named therein...............................
11(c)(4)*  Form of Employment Letter dated, August 22, 1997, among Parent, the
           Purchaser and certain executives of the Company.
11(c)(5)*  Form of Employment Letter, dated August 22, 1997, among Parent, the
           Purchaser and Noel L. Buterbaugh.
11(c)(6)*  Form of Assumption Agreement, dated as of August 22, 1997, among Parent,
           the Purchaser and the Company.
</TABLE>
    
 
- ---------------
   
* As previously filed
    

<PAGE>   1
   
                                                                Exhibit 11(a)(9)

[CAMBREX LETTERHEAD]

                                               NEWS RELEASE
                                               Release Date: September 25, 1997
                                               Contact:  Douglas H. MacMillian
                                                         Vice President/CFO
                                                         201-804-3025

              CAMBREX CASH TENDER OFFER FOR BIOWHITTAKER SUCCEEDS:
                      93% OF SHARES SUPPORT CAMBREX OFFER

    East Rutherford, New Jersey, September 26, 1997 - Cambrex Corporation
(AMEX:CMB) announced today that the tender offer for shares of BioWhittaker,
Inc. (NYSE:BWI) at $11.625 per share expired as scheduled at 12:00 midnight New
York City Time, on September 25, 1997. The offer by BW Acquisition Corporation,
a wholly-owned subsidiary of Cambrex, was for all of the outstanding shares of
common stock, par value $0.01 per share, of BioWhittaker.


    The Depository for the Offer informed Cambrex that 10,128,479 shares
(including shares tendered through guaranteed delivery procedures) were validly
tendered and not withdrawn. BW Acquisition Corporation has accepted all shares
validly tendered for purchase. After giving effect to the purchase of such
tendered shares, BW Acquisition Corporation will own 93% (assuming the valid
tender of shares tendered pursuant to guaranteed delivery procedures) of the
10,881,210 shares outstanding as of the expiration of the Offer.

    Cambrex also announced that BW Acquisition Corporation intends to merge with
and into BioWhittaker pursuant to the short form merger provisions of the
Delaware General Corporation Law. As a result of the merger, BioWhittaker would
become a wholly-owned subsidiary of Cambrex and all remaining BioWhittaker
shareholders (other than Cambrex and its affiliates) would be entitled to
receive the same $11.625 cash price for each of their shares.

    "We are pleased with the strong response to our offer and welcome
BioWhittaker and its more than 400 employees to the Cambrex family of
companies," said Jim Mack, Cambrex CEO. "BioWhittaker's growth prospects for
products used in biopharmaceutical manufacture are very exciting and enhance our
ability to meet our strategic goals in 1998 and beyond."
    


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