GAMMA BIOLOGICALS INC
8-A12B/A, 1998-09-25
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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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


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


                TEXAS                                           74-1668436    
(State of incorporation or organization)                     (I.R.S. Employer 
                                                            Identification No.)

                                3700 MANGUM ROAD
                              HOUSTON, TEXAS 77092
                    (Address of principal executive offices)


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

<TABLE>
<CAPTION>
Title of each class                     Name of each exchange on which
to be so registered                     each class is to be registered
- -------------------                     ------------------------------
<S>                                     <C>
COMMON STOCK
PURCHASE RIGHTS                         AMERICAN STOCK EXCHANGE, INC.
</TABLE>

     If this Form relates to the registration of a class of debt securities 
and is effective upon filing pursuant to General Instruction A.(c)(1), please 
check the following box.  [  ]

     If this Form relates to the registration of a class of debt securities 
and is to become effective simultaneously with the effectiveness of a 
concurrent registration statement under the Securities Act of 1933 pursuant 
to General Instruction A.(c)(2), please check the following box.  [  ]

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

                               Not applicable
<PAGE>

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

     On September 5, 1989, the Board of Directors of Gamma Biologicals, Inc. 
(the "Company") adopted a Shareholder Rights Plan (the "Rights Plan") and 
declared a dividend distribution of one right (a "Right") for each 
outstanding share of the Company's common stock, $.10 per share par value 
("Common Stock"), to shareholders of record at the close of business on 
October 2, 1989.

     Initially, the Rights will be attached to Common Stock certificates 
representing shares then outstanding, and no separate Rights Certificates 
will be distributed.  Transfer of Common Stock certificates will also 
transfer the Rights associated with the Common Stock.  Upon the occurrence of 
an event specified in the Rights Plan (such as the public announcement by a 
person (an "Acquiring Person") of an acquisition of 20% of the Company's 
outstanding Common Stock without the consent of the Company's Disinterested 
Directors) (the "Distribution Date"), the Rights will separate from the 
Common Stock, and Rights Certificates will be issued to Rights holders.  At 
that time, each Right will become exercisable for one share of Common Stock 
at the Purchase Price (initially $15.00), subject to adjustment from time to 
time to account for events such as stock dividends or upon the occurrence of 
certain triggering events as summarized herein and described in the Rights 
Plan.  The Rights are not exercisable until the Distribution Date and will 
expire at the close of business on September 5, 1999, unless earlier redeemed 
by the Company.  All Common Stock issued after the record date but prior to 
the Distribution Date will be issued with Rights attendant.

     Until the Distribution Date, the Company may terminate or amend the 
Rights Plan or adopt a new rights plan in substitution for the Rights Plan 
and all outstanding Rights.  After the Distribution Date, the Disinterested 
Directors by majority vote may amend the Rights Plan to a more limited 
extent, or may substitute a new rights plan for the Rights Plan and all 
outstanding Rights, if the change, supplement or substitution does not 
adversely affect the interests of Rights holders (other than those of an 
Acquiring Person or an affiliate or associate thereof).  A "Disinterested 
Director" is any director who has no control relationship or affiliation with 
any Acquiring Person or associate or affiliate thereof.

     If certain triggering events described in the Rights Plan occur, the 
Rights will become exercisable at the Purchase Price for shares of Common 
Stock having a value equal to two times the Purchase Price.  Rights 
beneficially owned by Acquiring Persons will become null and void, and may 
not be exercised. Triggering events include the acquisition of 20% of the 
Company's outstanding Common Stock without the consent of the Disinterested 
Directors; the acquisition of 2% or more of the Company's outstanding Common 
Stock without such consent following the acquisition of 20% with such 
consent; or the engagement by a consented-to 20% shareholder in certain 
self-dealing transactions.  If the Company is purchased or merged into 
another Company, the Rights may become exercisable for comparable securities 
of the surviving entity instead of Common Stock of the Company.

     At any time before September 5, 1999, the Disinterested Directors may 
vote to redeem the outstanding Rights at a price of $0.01 per Right.  If the 
Disinterested Directors elect to redeem the 

                                       2
<PAGE>

Rights, the outstanding Rights will no longer be exercisable, and their 
holders will be entitled only to have their Rights redeemed.

     Copies of the Rights Plan are available free of charge from the Company. 
This summary description of the Rights does not purport to be complete and is 
qualified in its entirety by reference to the Rights Plan, which is attached 
hereto as an exhibit.

     The Rights have certain anti-takeover effects.  The Rights will cause 
substantial dilution to a person or group that attempts to acquire the 
Company on terms not approved by the Company's Board of Directors, except 
pursuant to an offer conditioned on a substantial number of Rights being 
acquired.  The Rights should not interfere with any merger or other business 
combination approved by the Board of Directors since the Rights may be 
redeemed by the Company at $.01 per Right prior to September 5, 1999.

     On September 21, 1998, the Company, Immucor, Inc., a Georgia corporation 
("Immucor"), and Gamma Acquisition Corporation, a Texas corporation and 
wholly-owned subsidiary of Immucor (the "Immucor Subsidiary"), entered into 
an Agreement and Plan of Merger, as amended from time to time (the "Merger 
Agreement").  The Merger Agreement provides, among other things, for the 
tender offer by Immucor and the Immucor Subsidiary for the Common Stock (the
"Offer"), and if necessary, the subsequent merger of the Immucor Subsidiary 
with and into the Company resulting in the Company becoming an indirect wholly-
owned subsidiary of Immucor (the "Merger").

     To facilitate the transactions contemplated by the Merger Agreement, the 
Company entered into an Amendment to Shareholder Rights Plan effective upon 
execution of the Merger Agreement (the "Amendment").  Among other 
things, the Amendment (i) provides that Immucor and Affiliates of Immucor 
will not become an "Acquiring Person," and that no "Distribution Date," 
"Section 11(a)(ii) Event," "Section 13 Event," "Stock Acquisition Date" or 
"Triggering Event" (as such terms are defined in the Shareholder Rights Plan) 
will occur as a result of:  (A) the approval, execution or delivery of the 
Merger Agreement, (B) the acquisition of shares of Common Stock pursuant to 
the Offer or (C) the consummation of the Merger.  The Amendment is attached 
hereto as Exhibit 2 and is incorporated herein by reference.

     The foregoing descriptions of the Rights do not purport to be complete 
and are qualified in their entirety by reference to the Exhibits hereto.

ITEM 2.  EXHIBITS.

<TABLE>
<S>                      <C>
     *Exhibit 1          Shareholder Rights Plan of Gamma Biologicals, Inc. dated 
                         as of September 5, 1989, which includes as Exhibit A the 
                         form of Rights Certificate and as Exhibit B the Summary of
                         Rights to Purchase Common Stock.

     Exhibit 2           Amendment to Shareholder Rights Plan of Gamma
                         Biologicals, Inc. effective upon execution of the
                         Merger Agreement.
</TABLE>

     -------------------------
     * Previously filed.

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<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:  September 24, 1998              GAMMA BIOLOGICALS, INC.



                                       By:     /s/  Margaret J. O'Bannion
                                          -------------------------------
                                                Margaret J. O'Bannion
                                               Chief Financial Officer









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<PAGE>

                     AMENDMENT TO SHAREHOLDER RIGHTS PLAN
                                       

     1.   All capitalized terms used herein shall have the meaning set forth 
in the Agreement.

     2.   The definition of "Acquiring Person" in Section 1 of the Agreement 
is hereby amended and restated in its entirety to read as follows:

          "Acquiring Person" shall mean any Person or group of Persons
     acting together, directly or indirectly, through any contract,
     arrangement, understanding, relationship or otherwise, who or which,
     together with all Affiliates and Associates of such Person(s), shall
     be the Beneficial Owner of 20% or more of the shares of Common Stock
     then outstanding, but shall not include (i) the Company, (ii) any
     Subsidiary of the Company, or (iii) any employee benefit plan of the
     Company or any Subsidiary of the Company, or any Person or entity
     organized, appointed or established by the Company acting in
     accordance with and for or pursuant to the terms of any such plan. 
     Notwithstanding anything in this Agreement to the contrary, so long as
     that certain Agreement and Plan of Merger dated as of September 21,
     1998 by and among the Company, Immucor, Inc., a Georgia corporation
     ("Immucor"), and Gamma Acquisition Corporation, a Texas corporation
     (the "Merger Agreement"), has not been terminated pursuant to the
     terms thereof, neither Immucor nor any Affiliate of Immucor shall be
     deemed to be an Acquiring Person solely by reason of the execution,
     delivery and performance of the Merger Agreement, including the Offer,
     the Parent Stock Option and the Insider Lock-Up Options (as such terms
     are defined in the Merger Agreement) or the announcement, making or
     consummation of Offer, the Parent Stock Option and the Insider Lock-Up
     Options (as such terms are defined in the Merger Agreement), the
     consummation of the Merger or any other transactions contemplated by
     the Merger Agreement.  If any of these exceptions to the definition of
     an Acquiring Person apply, then the Person to whom the exception
     pertains shall not be an Acquiring Person for any purpose under this
     Agreement, including, without limitation, with respect to the
     definitions of Distribution Date, Section 11(a)(ii) Event, Section 13
     Event, Stock Acquisition Date and Triggering Event.

          Notwithstanding any provision of this Agreement to the contrary,
     (i) no Distribution Date, Section 11(a)(ii) Event, Section 13 Event,
     Stock Acquisition Date or Triggering Event shall be deemed to have
     occurred, (ii) neither Immucor nor any Subsidiary or Affiliate of
     Immucor shall be deemed to have become an Acquiring Person, and
     (iii) no holder of Rights shall be entitled to exercise such Rights
     under, or be entitled to any other rights pursuant to, this Agreement
     solely by reason of (A) the approval, execution or delivery of the
     Merger Agreement, (B) the acquisition of shares of Common Stock
     pursuant to the Offer (as defined in the Merger 

<PAGE>

     Agreement), or (C) the consummation of the Merger (as defined in the 
     Merger Agreement).

     3.   A new Section 21 shall be added (and the numbering of subsequent 
sections altered accordingly) as follows:

          Section 21.   TERMINATION.  Upon the acquisition of shares of
     Common Stock pursuant to the Offer (as defined in the Merger
     Agreement), and without any further action and without any notice, the
     right to exercise the Rights will terminate and the holders of Rights
     will have no further rights under this Plan.

     4.   Except as specifically provided herein, the Agreement shall 
continue in full force and effect in accordance with its terms without 
amendment or modification.


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