MOLECULAR DYNAMICS INC
8-A12G/A, 1998-08-14
LABORATORY ANALYTICAL INSTRUMENTS
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                         SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, D.C.  20549
                                          
                                     FORM 8-A/A
                                          
                 FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                          SECURITIES EXCHANGE ACT OF 1934
                                          
                              MOLECULAR DYNAMICS, INC.
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                                          
                                          
                DELAWARE                                94-3050031
        (STATE OF INCORPORATION                        (IRS EMPLOYER
           OR ORGANIZATION)                          IDENTIFICATION NO.)
                                          
           928 EAST ARQUES AVENUE, SUNNYVALE, CALIFORNIA      94086
             (Address of Principal Executive Offices)       (Zip Code)
                                          
                                          
        Securities to be registered pursuant to Section 12(b) of the Act:

                                        NONE
           -----------------------------------------------------------
                                  (Title of Class)

     If this form relates to the registration of a class of securities 
pursuant to Section 12(b) of the Exchange Act and is effective pursuant to 
General Instruction A.(c), check the following box. [  ]

     If this form relates to the registration of a class of securities 
pursuant to Section 12(g) of the Exchange Act and is effective pursuant to 
General Instruction A.(d), check the following box. [  ]

     Securities Act registration statement file number to which this form 
relates: (if applicable)

     Securities to be registered pursuant to Section 12(g) of the Act:

             Name of exchange on which each class is to be registered
             --------------------------------------------------------
                             NASDAQ National Market

                    Title of each Class to be so registered 
                    ---------------------------------------
                       Preferred Stock Purchase Rights

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     Item 1 of Form 8-A dated December 2, 1994 (the "Form 8-A"), of Molecular
Dynamics, Inc. is hereby amended as follows:

Item 1.  DESCRIPTION OF SECURITIES.

     Item 1 of the Form 8-A is hereby amended by adding the following 
paragraph at the end of Item 1 of the Form 8-A:

     On August 9, 1998, Molecular Dynamics, Inc. (the "Company") executed an 
amendment (the "Amendment") to the Rights Agreement, dated as of November 23, 
1994 (the "Rights Agreement"), between the Company and Harris Trust and 
Savings Bank, as Rights Agent.  The Amendment provides that neither Amersham 
Pharmacia Biotech Ltd., a Delaware corporation ("Parent"), APB Acquisition 
Corp., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger 
Sub"), any of their respective Affiliates or Associates nor any of their 
respective permitted assignees or transferees will become an Acquiring Person 
(as that term is defined in the Rights Agreement) as a result of the 
occurrence of any of the following: (i) execution of the Agreement and Plan of 
Merger dated as of August 9, 1998, among Parent, Merger Sub and the Company 
(the "Merger Agreement"), (ii) commencement and consummation of the Offer (as 
defined in the Merger Agreement), (iii) the acquisition of Shares (as defined 
in the Merger Agreement) by Sub pursuant to the Offer or (iv) the consummation 
of the Merger (as defined in the Merger Agreement).  The Amendment further 
provides that, despite the occurrence of any of the events described under 
(i), (ii), (iii) or (iv) above, a Distribution Date (as defined in the Rights 
Agreement) or the Shares Acquisition Date (as defined in the Rights Agreement) 
will not occur.

     The foregoing description of the Amendment is qualified in its entirety 
by reference to the full text of the Amendment, which is attached hereto as 
Exhibit 4.1(b) and is incorporated herein by reference, and to the Rights 
Agreement which was attached as an exhibit to the Form 8-A filed on December 
7, 1994 and which is incorporated herein by reference. 

<PAGE>

ITEM 2.  EXHIBITS.

          Exhibit No.    Description

          4.1(a)*        Rights Agreement dated as November 23, 1994 by and
                         between Molecular Dynamics, Inc. and Harris Trust and
                         Savings Bank.

          4.1(b)         First Amendment to the Rights Agreement dated as of
                         August 9, 1998 by and between Molecular Dynamics, Inc.
                         and Harris Trust and Savings Bank.

- ------------------

* Incorporated by reference to Exhibit 1 to Form 8-A dated December 2, 1994,
File No. 0-19955.

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                                        SIGNATURE

     Pursuant to the requirements of Section 12 of the Securities Exchange Act 
of 1934, the registrant has duly caused this registration statement to be 
signed on its behalf by the undersigned hereunto duly authorized.
     

Date:  August 14, 1998              MOLECULAR DYNAMICS, INC.
                                          (Registrant)



                                    By:  /s/Jay Flatley
                                         ----------------------
                                    Name:  Jay Flatley
                                    Title: President and Chief Executive Officer

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EXHIBIT INDEX

          Exhibit No.    Description

          4.1(a)*        Rights Agreement dated as November 23, 1994 by and
                         between Molecular Dynamics, Inc. and Harris Trust and
                         Savings Bank.

          4.1(b)         First Amendment to the Rights Agreement dated as of
                         August 9, 1998 by and between Molecular Dynamics, Inc.
                         and Harris Trust and Savings Bank.

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* Incorporated by reference to Exhibit 1 to Form 8-A dated December 2, 1994,
File No. 0-19955.


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                         FIRST AMENDMENT TO RIGHTS AGREEMENT

     This Amendment dated August 9, 1998 ("Amendment") to the Rights 
Agreement ("Agreement"), dated as of November 23, 1994, is between Molecular 
Dynamics, Inc., a Delaware corporation (the "Company"), and Harris Trust and 
Savings Bank (the "Rights Agent).

     Pursuant to Section 27 of the Agreement, the Continuing Directors (as 
defined in the Agreement) have determined on August 9, 1998 that it is in the 
best interest of the Company to amend the Company's Rights Agreement as set 
forth below and the Amendment is being executed by the Company and the Rights 
Agent for the purpose of amending the Agreement as set forth below:

     The Agreement is hereby amended as follows:

     1.   Section 1(a) shall be amended by inserting the following at the end 
of Section 1(a):

             "Notwithstanding the foregoing or any provision to the contrary in
     this Agreement, none of Amersham Pharmacia Biotech Ltd. ("Parent"), APB 
     Acquisition Corp. ("Sub"), or any of their respective subsidiaries, 
     Affiliates or Associates is an Acquiring Person pursuant to this 
     Agreement solely by virtue of the execution of the Agreement and Plan of 
     Merger of even date herewith among Parent, Sub and the Company (the 
     "Merger Agreement"), commencement and consummation of the Offer (as 
     defined in the Merger Agreement), the acquisition of Shares (as defined 
     in the Merger Agreement) by Sub pursuant to the Offer or the consummation 
     of the Merger (as defined in the Merger Agreement)."
          
     2.   Section 1(1) shall be amended by inserting the following at the end 
of Section 1(1):
          
               "Notwithstanding the foregoing or any provision to the contrary
          in this Agreement, a Distribution Date shall not occur solely by
          reason of the Offer, the execution of the Merger Agreement, the
          acquisition of the Shares by Sub pursuant to the Offer or the
          consummation of the Merger."
          
     3.   Section 1(cc) shall be amended by inserting the following at the end 
of Section 1(cc):
          
               "Notwithstanding the foregoing or any provision to the contrary
          in this Agreement, a Shares Acquisition Date shall not occur solely by
          reason of the Offer, the execution of the Merger Agreement, the
          acquisition of the Shares by Sub pursuant to the Offer or the
          consummation of the Merger."
          
     4.   Clause (i) of Section 7(a) shall be amended and restated in its      
entirety to read as follows:
          
               "(i) the earlier of (A) immediately prior to the Effective Time
          (as defined in the Merger Agreement) or (B) the close of business on
          December 2, 2004 (the "Final Expiration Date")"
          
     5.   This Amendment shall be deemed to be entered into under the laws of 
the State of Delaware and for all purposes shall be governed by and construed 
in accordance with the laws of such State applicable to contracts to be made 
and performed entirely within such State.
          
     6.   This Amendment may be executed in any number of counterparts and 
each of such counterparts shall for all purposes be deemed to be an original, 
and all such counterparts shall together constitute but one and the same 
instrument.
          
     7.   As amended hereby, the Agreement shall remain in full force and 
effect.

     IN WITNESS WHEREOF, the parties hereto have duly executed this First 
Amendment to Rights Agreement as of the date first written above.

MOLECULAR DYNAMICS, INC.


By: /s/ Jay Flatley
Name: Jay Flatley
Title:  President and Chief Executive Officer

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Attest: /s/ David L. Barker
Name:   David L. Barker
Title:  Vice President

HARRIS TRUST AND SAVINGS BANK,
AS RIGHTS AGENT



By:     /s/ Susan Knaack
Name:   Susan Knaack
Title:  Officer






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