NANOGEN INC
8-A12G, 1998-11-24
LABORATORY ANALYTICAL INSTRUMENTS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-A



                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


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


                 Delaware                                        33-0489621
         -----------------------                             -------------------
         (State of incorporation                              (I.R.S. Employer
            or organization)                                 Identification No.)


             10398 Pacific Center Court, San Diego, California 92121
         -----------------------------------------------------------------------
               (Address of principal executive offices) (Zip Code)



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


     Title of each class                        Name of each exchange on which
     to be so registered                        each class is to be registered

            None                                             None


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. |X|
                                            ---

Securities Act of 1933 registration statement file number to which this form 
relates:  N/A

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

             Series A Participating Preferred Stock Purchase Rights
            ----------------------------------------------------------
                                (Title of class)


<PAGE>



Item 1.  Description of Securities to be Registered.
- -------  -------------------------------------------

     On November 17, 1998, the Board of Directors of Nanogen, Inc. (the
"Company") declared a dividend distribution of one "Right" for each outstanding
share of common stock, par value $.001 per share (the "Common Stock"), of the
Company to shareholders of record at the close of business on November 30, 1998
(the "Record Date"). Except as set forth below, each Right, when exercis- able,
entitles the registered holder to purchase from the Company one one-thousandth
of a share of a new series of preferred stock, designated as Series A
Participating Preferred Stock, par value $.001 per share (the "Preferred
Stock"), at a price of $50.00 (the "Purchase Price"), subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement (the
"Rights Agreement") between the Company and BankBoston, N.A., as "Rights Agent."

     Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights certificates will
be distributed. The Rights will separate from the Common Stock and a
"Distribution Date" will occur upon the earliest of (i) a public announcement
that a person, entity or group of affiliated or associated persons and/or
entities (an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 15% or more of the outstanding shares of Common Stock,
other than as a result of repurchases of stock by the Company or certain
inadvertent actions by institutional or certain other shareholders, or (ii) ten
days (unless such date is extended by the Board of Directors) following the
commencement of (or a public announcement of an intention to make) a tender
offer or exchange offer which would result in any person, entity or group of
affiliated or associated persons and/or entities becoming an Acquiring Person.

     Until the Distribution Date the Rights will be evidenced, with respect to
any of the Common Stock certificates outstanding as of the Record Date, by such
Common Stock certificate together with this Summary of Rights. The Rights
Agreement provides that, until the Distribution Date, the Rights will be
transferred with and only with Common Stock certificates. From as soon as
practicable after the Record Date and until the Distribution Date (or earlier
redemption or expiration of the Rights), new Common Stock certificates issued
after the Record Date upon transfer or new issuance of the Common Stock will
contain a notation incorporating the Rights Agreement by reference. Until the
Distribution Date (or earlier redemption or expiration of the Rights), the
surrender for transfer of any certificates for Common Stock outstanding as of
the Record Date (with or without this Summary of Rights attached) will also
constitute the transfer of the Rights associated with the Common Stock
represented by such certificate. As soon as practicable following the
Distribution Date, separate certificates evidencing the Rights ("Rights
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date, and the separate Rights Certificates
alone will evidence the Rights.

     The Rights are not exercisable until the Distribution Date. The Rights will
expire on the earliest of (i) November 17, 2008, (ii) consummation of a merger
transaction with a Person or group who acquired Common Stock pursuant to a
Permitted Offer (as defined below), and is offering in the merger the same price
per share and form of consideration paid in the Permitted Offer, or (iii)
redemption or exchange of the Rights by the Company as described below.


                                       -2-


<PAGE>



     The number of Rights associated with each share of Common Stock shall be
proportionately adjusted to prevent dilution in the event of a stock dividend
on, or a subdivision, combination or reclassification of, the Common Stock. The
Purchase Price payable, and the number of shares of Preferred Stock or other
securities or property issuable, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of the Preferred
Stock, (ii) upon the grant to holders of the Preferred Stock of certain rights
or warrants to subscribe for Preferred Stock, certain convertible securities or
securities having the same or more favorable rights, privileges and preferences
as the Preferred Stock at less than the current market price of the Preferred
Stock, or (iii) upon the distribution to holders of the Preferred Stock of
evidences of indebtedness or assets (excluding regular quarterly cash dividends
out of earnings or retained earnings) or of subscription rights or warrants
(other than those referred to above). With certain exceptions, no adjustments in
the Purchase Price will be required until cumulative adjustments require an
adjustment of at least 1% in such Purchase Price.

     In the event that, after the first date of public announcement by the
Company or an Acquiring Person that an Acquiring Person has become such, the
Company is involved in a merger or other business combination transaction
(whether or not the Company is the surviving corporation) or 50% or more of the
Company's assets or earning power are sold (in one transaction or a series of
transactions), proper provision shall be made so that each holder of a Right
(other than an Acquiring Person) shall thereafter have the right to receive,
upon the exercise thereof at the then current Purchase Price, that number of
shares of common stock of either the Company, in the event that it is the
surviving corporation of a merger or consolidation, or the acquiring company
(or, in the event there is more than one acquiring company, the acquiring
company receiving the greatest portion of the assets or earning power
transferred) which at the time of such transaction would have a market value of
two times the Purchase Price (such right being called the "Merger Right"). In
the event that a Person becomes the beneficial owner of 15% or more of the
outstanding shares of Common Stock (unless pursuant to a tender offer or
exchange offer for all outstanding shares of Common Stock at a price and on
terms determined prior to the date of the first acceptance of payment for any of
such shares by at least a majority of the members of the Board of Directors who
are not officers of the Company and are not Acquiring Persons or Affiliates or
Associates thereof to be both adequate and otherwise in the best interests of
the Company and its shareholders (a "Permitted Offer")), then proper provision
shall be made so that each holder of a Right will for a 60-day period (subject
to extension under certain circumstances) thereafter have the right to receive
upon exercise that number of shares of Common Stock (or, at the election of the
Company, which election may be obligatory if sufficient authorized shares of
Common Stock are not available, a combination of Common Stock, property, other
securities (e.g., Preferred Stock) and/or a reduction in the exercise price of
the Right) having a market value of two times the Purchase Price (such right
being called the "Subscription Right"). The holder of a Right will continue to
have the Merger Right whether or not such holder exercises the Subscription
Right. Notwithstanding the foregoing, upon the occurrence of any of the events
giving rise to the exercisability of the Merger Right or the Subscription Right,
any Rights that are or were at any time after the Distribution Date owned by an
Acquiring Person shall immediately become null and void.

     At any time prior to the earlier to occur of (i) a Person becoming an
Acquiring Person or (ii) the expiration of the Rights, the Company may redeem
the Rights in whole, but not in part, at a price of $0.01 per Right (the
"Redemption Price"), which redemption shall be effective upon the action of the
Board of Directors. Additionally, the Company may thereafter redeem the then
outstanding Rights in whole, but not in part, at the Redemption Price (i) if
such redemption is


                                       -3-


<PAGE>



incidental to a merger or other business combination transaction or series of
transactions involving the Company but not involving an Acquiring Person or
certain related Persons or (ii) following an event giving rise to, and the
expiration of the exercise period for, the Subscription Right if and for as long
as the Acquiring Person triggering the Subscription Right beneficially owns
securities representing less than 15% of the outstanding shares of Common Stock
and at the time of redemption there are no other Acquiring Persons. The
redemption of Rights described in the preceding sentence shall be effective only
as of such time when the Subscription Right is not exercis- able, and in any
event, only after ten business days' prior notice. Upon the effective date of
the redemption of the Rights, the right to exercise the Rights will terminate
and the only right of the holders of Rights will be to receive the Redemption
Price.

     Subject to applicable law, the Board of Directors, at its option, may at
any time after a Person becomes an Acquiring Person (but not after the
acquisition by such Person of 50% or more of the outstanding Common Stock),
exchange all or part of the then outstanding and exercisable Rights (except for
Rights which have become void) for shares of Common Stock at a rate of one share
of Common Stock per Right or, alternatively, for substitute consideration
consisting of cash, securities of the Company or other assets (or any
combination thereof).

     The Preferred Stock purchasable upon exercise of the Rights will be
nonredeemable and junior to any other series of preferred stock the Company may
issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential quarterly dividend in an amount equal
to 1,000 times the dividend declared on each share of Common Stock, but in no
event less than $100.00. In the event of liquidation, the holders of shares of
Preferred Stock will receive a preferred liquidation payment equal to the
greater of $1,000.00 or 1,000 times the payment made per each share of Common
Stock. Each share of Preferred Stock will have 1,000 votes, voting together with
the shares of Common Stock. In the event of any merger, consolidation or other
transaction in which shares of Common Stock are exchanged, each share of
Preferred Stock will be entitled to receive 1,000 times the amount and type of
consideration received per share of Common Stock. The rights of the Preferred
Stock as to dividends, liquidation and voting, and in the event of mergers and
consolidations, are protected by customary antidilution provisions. Fractional
shares of Preferred Stock will be issuable; however, (i) the Company may elect
to distribute depositary receipts in lieu of such fractional shares and (ii) in
lieu of fractional shares other than fractions that are multiples of one
one-thousandth of a share, an adjustment in cash will be made based on the
market price of the Preferred Stock on the last trading date prior to the date
of exercise.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive dividends. The Company and the Rights Agent retain broad
authority to amend the Rights Agreement; however, following any Distribution
Date any amendment may not adversely affect the interests of holders of Rights.

     A copy of the Rights Agreement is attached as an exhibit to this
Registration Statement on Form 8-A. THIS SUMMARY DESCRIPTION OF THE RIGHTS DOES
NOT PURPORT TO BE COMPLETE AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE
RIGHTS AGREEMENT, WHICH IS INCORPORATED HEREIN BY REFERENCE.



                                       -4-


<PAGE>




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

         4.1      Rights Agreement dated as of November 17, 1998 between
                  Nanogen, Inc. and BankBoston, N.A., which includes as Exhibit
                  B the form of Rights Certificate. Pursuant to the Rights
                  Agreement, Rights Certificates will not be mailed until the
                  earlier of (i) a public announcement that a person or a group
                  of affiliated or associated persons has acquired beneficial
                  ownership of securities representing 15% or more of the
                  outstanding common stock or (ii) ten days after a person or a
                  group of affiliated or associated persons has commenced or
                  announced an intent to commence a tender offer or exchange
                  offer which, upon consummation thereof, would cause such
                  person or group to own beneficially securities representing
                  15% or more of the outstanding common stock.


                                       -5-


<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.


Dated:  November 23, 1998              NANOGEN, INC.


                                       By:  /s/ HARRY J. LEONHARDT
                                          ------------------------------------
                                           Harry J. Leonhardt
                                           Vice President, General Counsel and
                                           Secretary


                                       -6-


<PAGE>


                                  EXHIBIT INDEX
                                  -------------


      EXHIBIT
      -------

        4.1            Rights Agreement dated as of November 17, 1998 between
                       Nanogen, Inc. and BankBoston, N.A., which includes as
                       Exhibit B the form of Rights Certificate. Pursuant to the
                       Rights Agreement, Rights Certificates will not be mailed
                       until the earlier of (i) a public announcement that a
                       person or a group of affiliated or associated persons has
                       acquired beneficial ownership of securities representing
                       15% or more of the outstanding common stock or (ii) ten
                       days after a person or a group of affiliated or
                       associated persons has commenced or announced an intent
                       to commence a tender offer or exchange offer which, upon
                       consummation thereof, would cause such person or group to
                       own beneficially securities representing 15% or more of
                       the outstanding common stock.





                                       -7-

<PAGE>




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