HEARTSTREAM INC/DE
8-A12G/A, 1998-01-28
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
 
As filed with the Securities and Exchange Commission on January 28, 1998

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  ___________

                                   FORM 8-A/A

                               (Amendment No. 1)

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

                    PURSUANT TO SECTION 12 (b) OR (g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                               HEARTSTREAM, INC.
             (Exact name of registrant as specified in its charter)

                  Delaware                             91-1577477
  (State of incorporation or organization)  (IRS Employer Identification No.)

                    2401 Fourth Avenue, Suite 300, Seattle, WA  98121
                    (Address of principal executive offices)  (Zip Code)

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


      Title of each class                        Name of each exchange on which
      to be so registered                        each class is to be registered
      -------------------                        ------------------------------
             None                                            None

<TABLE>
<S>                                                    <C>
If this form relates to the registration of a          If this form relates to the registration
class of securities pursuant to Section 12(b)          of a class of securities pursuant to
of the Exchange Act and is effective pursuant          Section 12(g) of the Exchange Act and is
to General Instruction A.(c), check the                effective pursuant to General
following box.  [_]                                    Instruction A.(d), check the following box.  [X]
</TABLE>

 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:

                        Preferred Share Purchase Rights
                       -----------------------------------

                                (Title of Class)
<PAGE>
 
Item 1.        Description of Securities to be Registered
               ------------------------------------------

     On December 10, 1996, Heartstream, Inc. (the "Company") filed a
Registration Statement on Form 8-A with the Securities and Exchange Commission
(the "Commission") in order to register preferred share purchase rights issuable
in accordance with the terms of the Preferred Shares Rights Agreement (the
"Rights Agreement") between the Company and ChaseMellon Shareholder Services,
L.L.C., as Rights Agent (the "Rights Agent").

     On December 29, 1997, the Company and the Rights Agent entered into the
First Amendment to Rights Agreement (the "Amendment"), which amends the Rights
Agreement as originally executed.  The Rights Agreement, as amended by the
Amendment, is referred to herein as the "Amended Rights Agreement."  The Amended
Rights Agreement is substantially the same as the Rights Agreement as originally
executed, with the following principal exceptions:

ACQUIRING PERSON

     The Amended Rights Agreement provides that none of Hewlett-Packard Company
("Parent"), Whistler Acquisition Corporation ("Sub"), or any of their respective
subsidiaries, Affiliates or Associates is an Acquiring Person pursuant to the
Amended Rights Agreement solely by virtue of the approval, execution or delivery
of the Agreement and Plan of Merger dated as of December 29, 1997 among Parent,
Sub and the Company (the "Merger Agreement"), or the announcement or
consummation of the Merger (as defined in the Merger Agreement).

DISTRIBUTION DATE

     The Amended Rights Agreement provides that a Distribution Date shall not
occur solely by reason of the approval, execution or delivery of the Merger
Agreement or the announcement or consummation of the Merger.

SHARES ACQUISITION DATE

     The Amended Rights Agreement provides that a Shares Acquisition Date shall
not occur solely by reason of the approval, execution or delivery of the Merger
Agreement or the announcement or consummation of the Merger.

EXPIRATION DATE

     The Amended Rights Agreement provides that an Expiration Date is the
earlier of (i) immediately prior to the Effective Time of the Merger (as defined
in the Merger Agreement), (ii) the Close of Business on the Final Expiration
Date, (iii) the Redemption Date, (iv) consummation of any transaction
contemplated by Section 13(f) of the Amended Rights Agreement, or (v) the time
at which the Board of Directors orders the exchange of the Rights as provided in
Section 24 of the Amended Rights Agreement.

                                      -2-
<PAGE>
 
FINAL EXPIRATION DATE

     The Amended Rights Agreement provides that the Final Expiration Date is the
earlier of (i) immediately prior to the Effective Time of the Merger (as defined
in the Merger Agreement) or (ii) the Close of Business on December 6, 2006.

Item 2.   Exhibits
          --------

          The following exhibits are filed as a part of this Registration
          Statement:

          (1)  First Amendment to Rights Agreement, dated as of December 29,
               1997 between Heartstream, Inc. and ChaseMellon Shareholder
               Services, L.L.C.

                                      -3-
<PAGE>
 
                                   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, thereto duly authorized.

Date: January 27, 1998        HEARTSTREAM, INC.



                              By: /s/ Alan Levy
                                 ----------------------------------
                                 Alan Levy
                                 President and Chief Executive Officer

                                      -4-
<PAGE>
 
                               INDEX TO EXHIBITS



 

Exhibit No.     Description
- ----------      -----------
     (1)        First Amendment to Rights Agreement, dated as of December 29,
                1997 between Heartstream, Inc. and ChaseMellon Shareholder
                Services, L.L.C.

                                      -5-

<PAGE>
 
                                                                     Exhibit (1)

                      FIRST AMENDMENT TO RIGHTS AGREEMENT

     This Amendment dated December 29, 1997 ("Amendment") to the Preferred
Shares Rights Agreement ("Agreement"), dated as of December 6, 1996, is between
Heartstream, Inc., a Delaware corporation (the "Company"), and ChaseMellon
Shareholder Services, L.L.C. (the "Rights Agent").

     Pursuant to Section 27 of the Agreement, this 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 Hewlett-Packard Company ("Parent"), Whistler
          Acquisition Corporation ("Sub"), or any of their respective
          subsidiaries, Affiliates or Associates is an Acquiring Person pursuant
          to this Agreement solely by virtue of the approval, execution or
          delivery of the Agreement and Plan of Merger dated as of December 29,
          1997 among Parent, Sub and the Company (the "Merger Agreement"), or
          the announcement or consummation of the Merger (as defined in the
          Merger Agreement)."

     2.   Section 1(m) shall be amended by inserting the following at the end of
          Section 1(m).

          "Notwithstanding the foregoing or any provision to the contrary in
          this Agreement, a Distribution Date shall not occur solely by reason
          of the approval, execution or delivery of the Merger Agreement or the
          announcement or consummation of the Merger."

     3.   Section 1(s) shall be amended and restated in its entirety to read as
          follows:

               "(s)   "FINAL EXPIRATION DATE" shall mean the earlier of (i)
          immediately prior to the Effective Time (as defined in the Merger
          Agreement) or (ii) the Close of Business on December 6, 2006."

     4.   Section 1(r) shall be amended and restated in its entirety to read as
          follows:

               "(r)   "EXPIRATION DATE" shall mean the earlier of: (i)
          immediately prior to the Effective Time (as defined in the Merger
          Agreement), (ii) the Close of Business on the Final Expiration Date,
          (iii) the Redemption Date, (iv) consummation of any transaction
          contemplated by Section 13(f) hereof, or (v) the time at which the
          Board of Directors orders the exchange of the Rights as provided in
          Section 24 hereof."

     5.   Section 1(jj) shall be amended by inserting the following at the end
          of Section 1(jj).

          "Notwithstanding the foregoing or any provision to the contrary in
          this Agreement, a Shares Acquisition Date shall not occur solely by
          reason of the approval, execution or delivery of the Merger Agreement
          or the announcement or consummation of the Merger."


                                      -6-
<PAGE>
 
     6.   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.

     7.   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.

     8.   As amended hereby, the Agreement shall remain in full force and
          effect.

HEARTSTREAM, INC.



By: /s/ Alan Levy
   --------------------------------------
   Alan Levy
   Chief Executive Officer


Attest: /s/ James R. Shay
       ----------------------------------
       James R. Shay
       Secretary


CHASEMELLON SHAREHOLDER SERVICES, L.L.C.
AS RIGHTS AGENT


By: /s/ Dennis Treibel
   --------------------------------------
   Signature of Authorized Signatory



                                      -7-


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