TARGET THERAPEUTICS INC
8-A12G/A, 1997-04-02
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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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 (g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                           TARGET THERAPEUTICS, INC.
             (Exact name of Registrant as specified in its charter)

        DELAWARE                                       95-3962471
(State of Incorporation)                            (I.R.S. Employer
                                                   Identification No.)

                              47201 LAKEVIEW BLVD.
                               FREMONT, CA  94538
                    (Address of principal executive offices)

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

                        PREFERRED SHARE PURCHASE RIGHTS
                                (Title of Class)
<PAGE>   2



ITEM 1.          DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         On September 21, 1994, the Board of Directors of Target Therapeutics,
Inc. (the "Company") declared a dividend of one preferred share purchase right
(a "Right") for each outstanding share of Common Stock, $0.0025 par value (the
"Common Shares"), of the Company.  The dividend was paid on October 7, 1994
(the "Record Date") to stockholders of record as of the close of business on
that date.  Each Right currently entitles the registered holder to purchase
from the Company one one-thousandth of a share of Series A Participating
Preferred Stock, $0.001 par value, of the Company (the "Preferred Shares"),
subject to adjustment, at a price of $300.00 per one-thousandth of a preferred
share, subject to adjustment (the "Purchase Price").  The description and terms
of the Rights are set forth in a Preferred Shares Rights Agreement (the "Rights
Agreement") dated as of September 21, 1994 between the Company and The First
National Bank of Boston, as Rights Agent (the "Rights Agent"), as amended on
May 7, 1996 (the "First Amendment"), and as later amended as of January 20,
1997 (the "Second Amendment").

         The following is a general description only and is subject to the
detailed terms and conditions of the Rights Agreement, as amended.  A copy of
the Rights Agreement, including the Certificate of Designation, the form of
Rights Certificate and the Summary of Rights to be provided to stockholders of
the Company, as well as the amendments thereto, are attached as exhibits to
this Registration Statement and are incorporated herein by reference.  All
figures have been updated to reflect adjustments resulting from the Company's
1-for-1 share stock dividend in December 1995 as well as the May 1996 amendment
to the purchase price.

Rights Evidenced by Common Share Certificates

         The Rights will not be exercisable until the Distribution Date
(defined below).  Accordingly, Common Share certificates outstanding on the
Record Date will evidence the Rights related thereto, and Common Share
certificates issued after the Record Date will contain a notation incorporating
the Rights Agreement by reference.  Until the Distribution Date (or earlier
redemption, exchange or expiration of the Rights), the surrender or transfer of
any certificates for Common Shares, even without notation or a copy of the
Summary of Rights being attached thereto, will also constitute the transfer of
the Rights associated with the Common Shares represented by such certificate.

Distribution Date

         The Rights will separate from the Common Shares, certificates for the
rights ("Rights Certificates") will be issued and the Rights will become
exercisable upon the earlier of:  (i) the close of business on the tenth day
(or such later date as may be determined by a majority of the Board of
Directors, excluding directors affiliated with the Acquiring Person, as defined
below (the "Continuing Directors")) following a public announcement that a
person or group of affiliated or associated persons has acquired, or obtained
the right to acquire, beneficial ownership of 15% or more of the outstanding
Common Shares (or, in the case of Collagen Corporation, has acquired Common
Shares that would increase its holdings above their September 21, 1994 level,
unless approved by the Company's Board of Directors or a committee thereof) (an
"Acquiring Person") or (ii) the close of business on the tenth day (or such
later date as may be determined by a majority of the Continuing Directors)
following the commencement of a tender offer or exchange offer, the
consummation of which would result in the beneficial ownership by a person or
group of 15% or more of the outstanding Common Shares.  The earlier of such
dates is referred to as the "Distribution Date."  A "Triggering Event" shall be
deemed to have occurred upon any person (other than the Company, any subsidiary
of the Company, any employee benefit plan of the Company or any subsidiary of
the Company, or any entity holding Common Shares for or pursuant to the terms
of any such plan), together with all affiliates and associates of such person,
becoming an Acquiring Person.

Issuance of Rights Certificates, Expiration of Rights

         As soon as practicable following the Distribution Date, separate
Rights Certificates will be mailed to holders of record of the Common Shares as
of the close of business on the Distribution Date and such separate Rights
Certificates alone will evidence the Rights from and after the Distribution
Date.  Unless otherwise determined by the Board of Directors, all Common Shares
issued prior to the Distribution Date will be issued with Rights.  Common
Shares issued after the Distribution Date may be issued with Rights if such
shares are issued (i) upon the exercise,





<PAGE>   3

conversion or exchange of securities issued after adoption of the Rights
Agreement or (ii) pursuant to the exercise of stock options or under any
employee benefit plan or arrangement.  Except as otherwise determined by the
Board of Directors, no other Common Shares issued after the Distribution Date
will be issued with Rights.  In addition, no Common Shares issued after the
Distribution Date will be issued with Rights if such issuance would result in
(or create a significant risk) (i) of material adverse tax consequences to the
Company or the person to whom such Rights Certificate would be issued or (ii)
that such options or plans would not qualify for otherwise available special
tax treatment.  The Rights will expire on September 21, 2004 (the "Final
Expiration Date"), unless the Final Expiration Date is extended or unless the
Rights are earlier redeemed or exchanged by the Company or expire upon
consummation of certain mergers, consolidations or sales of assets, as
described below.

Initial Exercise of the Rights 

         Following the Distribution Date, and until the occurrence of one of
the subsequent events described below, holders of the Rights will be entitled
to receive, upon exercise and the payment of $300.00 (the "Purchase Price") per
Right, one one-thousandth of a Preferred Share.

Exchange Provision

         At any time after an Acquiring Person has become such and prior to the
Acquiring Person beneficially owning 50% or more of the outstanding Common
Shares, the Board of Directors of the Company may exchange the Rights (other
than Rights owned by the Acquiring Person or its affiliates), in whole or in
part, at an exchange ratio of one Common Share per Right (subject to
adjustment).

Right to Buy Common Shares at Half Price

         Unless the Rights are earlier redeemed or exchanged, in the event that
an Acquiring Person becomes such, other than pursuant to a tender offer which
is made for all of the outstanding Common Shares and approved by a majority of
the Continuing Directors after determining that the offer is both adequate and
otherwise in the best interests of the Company and its stockholders (a
"Permitted Offer"), then proper provision will be made so that each holder of a
Right which has not theretofore been exercised (other than Rights beneficially
owned by the Acquiring Person, which will thereafter be void) will thereafter
have the right to receive, upon exercise of a Right, a number of Common Shares
having a then current value equal to two times the Purchase Price.  In the
event that the Company does not have a sufficient number of Common Shares
available, or the Board decides that such action is necessary or appropriate
and not contrary to the interests of Rights holders, the Company may, among
other things, instead substitute cash, assets or other securities for the
Common Shares into which the Rights would have otherwise been exercisable.

Right to Buy Acquiring Company Stock at Half Price

         Similarly, unless the Rights are earlier redeemed or exchanged, in the
event that, after the Shares Acquisition Date (as defined below), (i) the
Company consolidates with or merges into another entity, (ii) another entity
consolidates with or merges into the Company or (iii) the Company sells or
otherwise transfers 50% or more of its consolidated assets or earning power,
proper provision must be made so that each holder of a Right which has not
theretofore been exercised (other than Rights beneficially owned by the
Acquiring Person, which will thereafter be void) will thereafter have the right
to receive, upon exercise, a number of shares of common stock of the acquiring
company having a then current value equal to two times the Purchase Price
(unless the transaction satisfies certain conditions and is consummated with a
person who acquired shares pursuant to a Permitted Offer, in which case the
Rights will expire).

Adjustments to Prevent Dilution

         The Purchase Price payable, the number of Rights and the number of
Preferred Shares, Common Shares or other securities or property issuable upon
exercise of the Rights are subject to adjustment from time to time to prevent





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dilution as set forth in the Rights Agreement.  With certain exceptions, no
adjustment in the Purchase Price will be required until cumulative adjustments
require an adjustment of at least 1% in such Purchase Price.

Rights and Preferences of the Preferred Shares

         Preferred Shares purchasable upon exercise of the Rights will not be
redeemable.  Each Preferred Share will be entitled to an aggregate dividend of
1,000 times the dividend declared per Common Share.  In the event of
liquidation, the holders of the Preferred Shares will be entitled to a
preferential liquidation payment equal to accrued but unpaid dividends plus the
greater of $1,000 per share or 1,000 times the aggregate per share amount to be
distributed to the holders of Common Shares.  Each Preferred Share will have
1,000 votes, voting together with the holders of Common Shares, except as
required by law or the Certificate of Determination of Rights, Preferences and
Privileges of Series A Participating Preferred Stock.  In the event of any
merger, consolidation or other transaction in which Common Shares are changed
or exchanged, each Preferred Share will be entitled to receive 1,000 times the
amount received per Common Share.  These rights are protected by customary
anti-dilution provisions.  Because of the nature of the dividend, liquidation
and voting rights of the Preferred Shares, the value of the one one-thousandth
interest in a Preferred Share purchasable upon exercise of each Right should
approximate the value of one Common Share.

Redemption

         At any time prior to the close of business on the earlier of (i) the
tenth day following the date (the "Shares Acquisition Date") of public
announcement that an Acquiring Person has become such or such later date as may
be determined by a majority of the Continuing Directors and publicly announced
by the Company or (ii) the Final Expiration Date of the Rights, the Company may
redeem the Rights in whole, but not in part, at a price of $.005 per Right
("Redemption Price").

No Stockholders' Rights Prior to Exercise

         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company (other than any rights resulting from
such holder's ownership of Common Shares), including, without limitation, the
right to vote or to receive dividends.

Amendment of Rights Agreement

         The provisions of the Rights Agreement may be supplemented or amended
by the Board of Directors in any manner prior to the Distribution Date without
the approval of Rights holders.  After the Distribution Date, the provisions of
the Rights Agreement may be supplemented or amended by the Board in order to
(i) cure any ambiguity, defect or inconsistency, (ii) to make changes which are
deemed necessary or advisable and do not adversely affect the interests of
holders of Rights (excluding the interests of any Acquiring Person), or (iii)
to shorten or lengthen any time period under the Rights Agreement; provided,
however, that no amendment to lengthen (A) the time period governing redemption
shall be made at such time as the Rights are not redeemable, or (B) any other
period unless for the purpose of protecting, enhancing or clarifying the rights
of, and/or benefits to, the holders of Rights.

Second Amendment

         The Second Amendment was approved by the Board of Directors to confirm
the intent of the Rights Agreement with respect to mergers or business
combinations approved by the Board of Directors.  In particular, the Second
Amendment confirms that Boston Scientific Corporation, a Delaware corporation,
together with its subsidiaries and affiliates, will not to be deemed to be an
Acquiring Person by reason of (i) the approval, execution or delivery of the
Agreement and Plan of Merger, dated as of January 20, 1997, among Boston
Scientific Corporation, Patriot Acquisition Corp., and the Company (the "Merger
Agreement"), or (ii) the consummation of the transactions pursuant to the
Merger Agreement.  More specifically, the Second Amendment provides the
following:





<PAGE>   5



                 1.       No Distribution Date shall be deemed to have occurred
                 by reason of (i) the approval, execution or delivery of the
                 Merger Agreement, or (ii) the consummation of the transactions
                 pursuant to the Merger Agreement;

                 2.       No consolidation, merger or sale or transfer of
                 assets or earning power within the meaning of Section 13 of
                 the Rights Agreement shall be deemed to have occurred by
                 reason of (i) the approval, execution or delivery of the
                 Merger Agreement, or (ii) the consummation of the transactions
                 pursuant to the Merger Agreement;

                 3.       No Shares Acquisition Date shall be deemed to have
                 occurred by reason of (i) the approval, execution or delivery
                 of the Merger Agreement, or (ii) the consummation of the
                 transactions pursuant to the Merger Agreement;

                 4.       No Triggering Event shall be deemed to have occurred
                 by reason of (i) the approval, execution or delivery of the
                 Merger Agreement, or (ii) the consummation of the transactions
                 pursuant to the Merger Agreement; and

                 5.       The Final Expiration Date is defined to mean the
                 earlier of (i) September 21, 2004, and (ii) the Effective Date
                 (as defined in the Merger Agreement).

Certain Anti-takeover Effects

         The Rights approved by the Board are designed to protect and maximize
the value of the outstanding equity interests in the Company in the event of an
unsolicited attempt by an acquiror to take over the Company, in a manner or on
terms not approved by the Board of Directors.  Takeover attempts frequently
include coercive tactics to deprive a corporation's Board of Directors and its
stockholders of any real opportunity to determine the destiny of the
corporation.  The Rights have been declared by the Board in order to deter such
tactics, including a gradual accumulation of shares in the open market of a 15%
or greater position to be followed by a merger or a partial or two-tier tender
offer that does not treat all stockholders equally.  These tactics unfairly
pressure stockholders, squeeze them out of their investment without giving them
any real choice and deprive them of the full value of their shares.

         The Rights are not intended to prevent a takeover of the Company and
will not do so.  The Rights are not exercisable in the event of a Permitted
Offer, as described above.  The Rights may be redeemed by the Company at $.005
per Right within ten days (or such later date as may be determined by a
majority of the Continuing Directors) after the accumulation of 15% or more of
the Company's outstanding Common Shares by a single acquiror or group (or, in
the case of Collagen Corporation, the acquisition of Common Shares that would
increase its holdings above their September 21, 1994 level, unless approved by
the Company's Board of Directors or a committee thereof).  Accordingly, the
Rights should not preclude any merger or business combination approved by the
Board of Directors.  Issuance of the Rights does not in any way weaken the
financial strength of the Company or interfere with its business plans. The
issuance of the Rights has no immediate dilutive effect, will not affect
reported earnings per share, should not be taxable to the Company or to its
stockholders and will not change the way in which the Company's shares are
presently traded.  The Company's Board of Directors believes that the Rights
represent a sound and reasonable means of addressing the complex issues of
corporate policy created by the current takeover environment.  However, the
Rights may have the effect of rendering more difficult or discouraging an
acquisition of the Company deemed undesirable by the Board of Directors.  The
Rights may cause substantial dilution to a person or group that attempts to
acquire the Company on terms or in a manner not approved by the Company's Board
of Directors, except pursuant to an offer conditioned upon the negation,
purchase or redemption of the Rights.

ITEM 2.          EXHIBITS.

                     1. (1)       Preferred Shares Rights Agreement, dated as of
                                  September 21, 1994, between Target
                                  Therapeutics, Inc. and The First National Bank
                                  of Boston, including the Certificate of
                                  Designation of Rights, Preferences and
                                  Privileges of Series A Participating Preferred
                                  Stock,





<PAGE>   6
                                  the form of Rights Certificate and the
                                  Summary of Rights attached thereto as
                                  Exhibits A, B and C, respectively.

                     2. (2)       Amendment to Preferred Shares Rights
                                  Agreement, dated May 7, 1996, between Target
                                  Therapeutics, Inc. and The First National
                                  Bank of Boston.

                     3. (3)       Second Amendment to Preferred Shares Rights
                                  Agreement dated as of January 20, 1997, 
                                  between Target Therapeutics, Inc. and The 
                                  First National Bank of Boston.
 
                     -----------
                     (1)  Incorporated herein by reference to Exhibit No. 1
                          filed with Registrant's Form 8-A filed on September
                          22, 1994.

                     (2)  Incorporated herein by reference to Exhibit No. 4.2
                          filed with the Company's Form 10-K for the year ended
                          March 31, 1996.

                     (3)  Incorporated herein by reference to Exhibit No. 4.4
                          filed with Registrant's Form 8-K filed on January 23,
                          1997.





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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, thereto duly authorized.

                             TARGET THERAPEUTICS, INC.


Date:  March 26, 1997        By   /s/ Robert E. McNamara
                                ------------------------------------------
                                Robert E. McNamara
                                Vice President, Finance and Administration,
                                Chief Financial Officer and Assistant Secretary





<PAGE>   8

                               INDEX TO EXHIBITS
<TABLE>
<CAPTION>
                                                                                             Sequentially
Exhibit No.                                   Description                                   Numbered Page
- -----------                                   -----------                                   -------------             
    <S>       <C>                                                                          <C>
    1.        Preferred Shares Rights Agreement, dated as of September 21, 1994, between   Incorporated by
              Target Therapeutics, Inc. and The First National Bank of Boston, including   reference
              the Certificate of Designation of Rights, Preferences and Privileges of
              Series A Participating Preferred Stock, the form of Rights Certificate and
              the Summary of Rights attached thereto as Exhibits A, B and C,
              respectively.

    2.        Amendment to Preferred Shares Rights Agreement, dated May 7, 1996, between   Incorporated by
              Target Therapeutics, Inc. and The First National Bank of Boston.             reference

    3.        Second Amendment to Preferred Shares Rights Agreement dated as of January    Incorporated by
              20, 1997, between Target Therapeutics, Inc. and The First National Bank of   reference
              Boston.
</TABLE>







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