LIGAND PHARMACEUTICALS INC
8-K, 1998-08-25
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K

                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


        Date of Report (Date of earliest event reported): August 12, 1998


                       LIGAND PHARMACEUTICALS INCORPORATED
             (Exact name of registrant as specified in its charter)


                                    DELAWARE
                 (State or other jurisdiction of incorporation)


                000-20720                         77-0160744
         (Commission File Number)       (IRS Employer Identification No.)


                 10275 Science Center Drive, San Diego, CA 92121
               (Address of principal executive offices) (Zip Code)


                                 (619) 535-3900
              (Registrant's telephone number, including area code)


                                 Not applicable.
          (Former name or former address, if changed since last report)







<PAGE>   2


Item 2.  Acquisition or Disposition of Assets.

               On August 12, 1998, Ligand Pharmaceuticals Incorporated, a
Delaware corporation ("Ligand"), acquired Seragen, Inc., a Delaware corporation
("Seragen"), through a merger (the "Merger") of Ligand's wholly owned
subsidiary, Knight Acquisition Corporation, a Delaware corporation ("Merger
Sub"), with and into Seragen. The Merger was consummated on the terms set
forth in the Agreement and Plan of Reorganization, dated as of May 11, 1998,
among Ligand, Merger Sub and Seragen (the "Merger Agreement"). As a result of
the Merger, Seragen is now a wholly owned subsidiary of Ligand.

               Seragen is a biotechnology company developing receptor-targeted
fusion proteins for cancer and dermatology. Fusion proteins consist of a toxin
fragment genetically fused to a hormone, or growth factor, that targets specific
receptors on the surface of disease-causing cells. With the acquisition of
Seragen, Ligand acquired the rights to ONTAK(TM) (DAB(389)IL-2 Interleukin-2
Fusion Protein or denileukin diftitox), a product which is currently under
review by the U.S. Food and Drug Administration (the "FDA") that shows promise
in the treatment of persistent cutaneous T-cell lymphoma ("CTCL"), and the
intellectual property assets of potential commercial value from several current
and possible future royalty bearing agreements.

               Ligand intends to focus primarily on the development of ONTAK and
attempt to realize potential commercial value from Seragen's intellectual
property assets. Ligand intends to use Seragen's equipment and other physical
assets in substantially the same manner such assets were used prior to the
Merger, subject to Ligand's objective of achieving optimal synergies,
integrating and streamlining overlapping functions and controlling expenditures.

               Under the terms of the Merger Agreement, Ligand paid a total of
$30 million in merger consideration at the closing, $4 million of which was in
cash then held by Ligand and $26 million of which was in the form of
approximately 1,858,000 shares of Ligand common stock, par value $.001 (the
"Ligand Common Stock"), valued at $13.9875 per share. From the upfront payment,
Seragen's common shareholders received approximately .036 of a share of Ligand
Common Stock for every share of Seragen common stock, par value $.01 (the
"Seragen Common Stock"), owned immediately prior to the closing. The remainder
of the $30 million in merger consideration was used by Seragen to settle claims
of Seragen's creditors and obligees ("Seragen Stakeholders").

               The Merger Agreement also provides for an additional $37 million
in cash and/or Ligand Common Stock, at Ligand's option, to be paid either six
months after the date of receipt of final FDA approval to market ONTAK for CTCL
or August 12, 2000, whichever is earlier. The $37 million payment will not be
made, however, it ONTAK has not received final approval by the FDA by August 12,
2000, provided that Ligand has satisfied certain diligence obligations to pursue
such approval. From the $37 million payment, if and when made, Seragen common
shareholders will receive $0.23 in, at Ligand's option, cash or the equivalent
value of Ligand Common Stock (based on the average closing share price for the
10 trading days immediately preceding the payment date) for every share of
Seragen Common Stock owned. The remainder of the $37 million will be paid to
Seragen Stakeholders.

               Ligand hereby incorporates by reference into this Report on Form
8-K that section entitled "The Merger Agreement" contained in that Registration
Statement on Form S-4 filed by Ligand with the Securities and Exchange
Commission (the "Commission") on July 9, 1998, Registration No. 333-58823 (the
"Registration Statement"), in which there is contained a more detailed
description of the Merger.




<PAGE>   3

               The description of the Merger contained herein is qualified in
its entirety by reference to the Merger Agreement, as previously filed with the
Commission as Exhibit 2.1 to the Registration Statement, and the Press Release
issued by Ligand, dated August 12, 1998, a copy of which is attached hereto as
Exhibit 99.1.


Item 7. Financial Statements and Exhibits.

        (a)    Financial Statements of Seragen.

               The Financial Information of Seragen required to be filed
               pursuant to Item 7(a) of Form 8-K was not available at the time
               of filing of this Current Report on Form 8-K and will be filed on
               a Form 8-K/A as soon as practicable, but in no event later than
               60 days after the date this Form 8-K is required to be filed.

        (b)    Pro Forma Financial Statements.

               The Pro Forma Financial Information required to be filed pursuant
               to Item 7(b) of Form 8-K was not available at the time of filing
               of this Current Report on Form 8-K and will be filed on a Form
               8-K/A as soon as practicable, but in no event later than 60 days
               after the date this Form 8-K is required to be filed.

        (c)    Exhibits.

               Exhibit 2.1*  Agreement and Plan of Reorganization, dated as of
                             May 11, 1998, by and among Ligand, Seragen and
                             Merger Sub

               Exhibit 2.2   Certificate of Merger between Seragen and
                             Merger Sub, dated as of August 12, 1998

               Exhibit 99.1  Press Release dated August 12, 1998


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

*  Filed as an exhibit to Ligand's Registration Statement on Form S-4 (No.
   333-58823) filed with the Securities and Exchange Commission on July 9, 1998
   and incorporated herein by reference.


<PAGE>   4


                                   SIGNATURES


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



                                    LIGAND PHARMACEUTICALS
                                    INCORPORATED


                                    By:     /s/ PAUL V. MAIER
                                        ----------------------------------------
                                            Paul V. Maier, Senior Vice President
                                            and Chief Financial Officer


Date:  August 25, 1998



                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit
Number                              Document
- -------                             --------
<S>           <C>
 2.1*         Agreement and Plan of Reorganization, dated as of May 11, 1998, by
              and among Ligand, Seragen and Merger Sub

 2.2          Certificate of Merger between Seragen and Merger Sub,
              dated as of August 12, 1998

99.1          Press Release dated August 12, 1998
</TABLE>


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

*  Filed as an exhibit to Ligand's Registration Statement on Form S-4 (No.
   333-58823) filed with the Securities and Exchange Commission on July 9, 1998
   and incorporated herein by reference.



<PAGE>   1


                                                                     EXHIBIT 2.2



                            CERTIFICATE OF MERGER OF
                         KNIGHT ACQUISITION CORPORATION
                            (a Delaware corporation)
                                  WITH AND INTO
                                  SERAGEN, INC.
                            (a Delaware corporation)

                (UNDER SECTION 251 OF THE GENERAL CORPORATION LAW
                            OF THE STATE OF DELAWARE)

               The undersigned corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
CERTIFY THAT:

               FIRST: The name and state of incorporation of each of the
constituent corporations of the merger are as follows:

<TABLE>
<CAPTION>
                         Name                     State of Incorporation
          ------------------------------          ----------------------
          <S>                                             <C>
          Knight Acquisition Corporation                  Delaware
          Seragen, Inc.                                   Delaware
</TABLE>

               SECOND: An agreement and plan of merger has been approved,
adopted, certified, executed and acknowledged by each of the constituent
corporations in accordance with the requirements of subsection (c) of Section
251 of the General Corporation Law of the State of Delaware.

               THIRD: The name of the surviving corporation of merger is
Seragen, Inc. a Delaware corporation ("Seragen").

               FOURTH: As a result of the merger, Seragen will amend and restate
its Restated Certificate of Incorporation in the form attached hereto as Exhibit
A.

               FIFTH: The executed Agreement and Plan of Reorganization is on
file at the principal place of business of Seragen. The address of the principal
place of business is 97 South Street, Hopkinton, MA 01748.

               SIXTH: A copy of the Agreement and Plan of Reorganization will be
furnished by Seragen on request and without cost to any stockholder of Seragen
or Knight Acquisition Corporation.


<PAGE>   2


               IN WITNESS WHEREOF, Seragen, Inc., a Delaware corporation, has
caused this Certificate to be signed by Reed R. Prior, its Chairman, Chief
Executive Officer and Treasurer, on the 12th day of August, 1998.




                                        SERAGEN, INC.,
                                        a Delaware corporation



                                        By:  /s/ Reed R. Prior
                                            ------------------------------------
                                              Reed R. Prior
                                              Chairman, Chief Executive Officer
                                              and Treasurer



<PAGE>   3


                                    EXHIBIT A

                        AMENDED AND RESTATED CERTIFICATE
                        OF INCORPORATION OF SERAGEN, INC.


               FIRST: The name of the corporation is Seragen, Inc.

               SECOND: The address of the corporation's registered office in the
State of Delaware is 30 Old Rudnick Lane, City of Dover, County of Kent 19901.
The name of its registered agent at such address is CorpAmerica, Inc.

               THIRD: The purpose of the corporation is to engage in any lawful
act or activity for which corporations may be organized under the General
Corporation Law of Delaware.

               FOURTH: The total number of shares which the corporation shall
have authority to issue is 100 shares of capital stock, and the par value of
each such share is $.001 per share.

               FIFTH: The corporation shall have perpetual existence.

               SIXTH: The Board of Directors of the corporation is expressly
authorized to make, alter or repeal bylaws of the corporation, but the
stockholders may make additional bylaws and may alter or repeal any bylaw
whether adopted by them or otherwise.

               SEVENTH: Elections of directors need not be by written ballot
except and to the extent provided in the bylaws of the corporation.

               EIGHTH: To the fullest extent permitted by the General
Corporation Law of Delaware, a director of the corporation shall not be liable
to the corporation or its stockholders for monetary damages for breach of
fiduciary duty as a director.

               NINTH: Each person who is or was a director or officer of the
corporation (including the heirs, executors, administrators or estate of such
person) shall be indemnified by the corporation as of right to the fullest
extent permitted or authorized by the General Corporation Law of Delaware
against any liability, cost or expense asserted against such director or
officer, or arising out of any such person's status as a director or officer.
The corporation may, but shall not be obligated to, maintain insurance, at its
expense, to protect itself and any such person against any such liability, cost
or expense.

               TENTH: The corporation shall not be subject to the provisions of
Section 203 of the Delaware General Corporation Law.




<PAGE>   1


                                                                    EXHIBIT 99.1



Ligand Completes Merger With Seragen; Seragen Stockholders Approve Merger Today


        SAN DIEGO--(BW HealthWire)--Aug. 12, 1998--Ligand (LYE-gand)
Pharmaceuticals Incorporated (NASDAQ:LGND) announced today that its merger with
Seragen Inc. (OTCBB:SRGN) has been approved by a majority of Seragen
stockholders.

        Under the companies' definitive merger agreement, a wholly owned
subsidiary of Ligand, Knight Acquisition Corp., merged with Seragen and Seragen
became a wholly owned subsidiary of Ligand. More than 97 percent by voting power
of Seragen capital stock present or represented at a special meeting held this
morning voted in favor of the merger. Those voting were a majority by total
voting power of Seragen capital stock.

        Under the terms of the merger agreement, Ligand paid merger
consideration at the closing in the amount of $30 million, $4.0 million of which
was in cash and $26 million of which was in the form of approximately 1,858,000
shares of Ligand Common Stock valued at $13.9875 per share. From the upfront
payment, Seragen's common shareholders received approximately .036 of a share of
Ligand Common Stock for every share of Seragen Common Stock owned immediately
prior to the closing. The remainder of the $30 million in merger consideration
was used to settle claims of Seragen's creditors and preferred shareholders.
Seragen Common Stock, which previously had been quoted on the OTC Bulletin
Board, will no longer be publicly traded. The merger became effective Aug. 12,
1998.

        The merger agreement also provides for an additional $37 million in cash
and/or Ligand Common Stock, at Ligand's option, to be paid either six months
after the date of receipt of final U.S. Food and Drug Administration (FDA)
approval to market ONTAK(TM) (DAB389IL-2, Interleukin-2 Fusion Protein or
denileukin diftitox) for cutaneous T-cell lymphoma (CTCL) or Aug. 12, 2000,
whichever is earlier. The $37 million payment will not be made, however, if
ONTAK has not received final approval by the FDA by August 12, 2000, provided
that Ligand has satisfied certain diligence obligations to pursue such approval.
From the $37 million payment, Seragen common shareholders will receive $0.23 in,
at Ligand's option, cash or the equivalent value of Ligand Common Stock (based
on the average closing share price for the 10 trading days immediately preceding
the payment date) for every share of Seragen Common Stock owned. The remainder
of the $37 million payment will be used to settle claims of Seragen's creditors
and preferred shareholders.

        "We are pleased to be acquiring Seragen, and with it, rights to ONTAK, a
product which is currently under review by the FDA that shows promise in the
treatment of persistent CTCL, and the intellectual property assets of potential
commercial value from several current and possible future royalty bearing
agreements," said Ligand Chairman, President and Chief Executive Officer David
E. Robinson. "We are particularly pleased that, if approved, ONTAK will be the
first product marketed and commercialized for the treatment of CTCL by Ligand.
The Company is working to strengthen its position in CTCL and other
non-Hodgkin's lymphoma therapies by filing New Drug Applications for Targretin
capsules (bexarotene) and Targretin gel (bexarotene) 1.0% in late 1998 or early
1999.



<PAGE>   2

        "We would like to thank Seragen Chairman and CEO Reed R. Prior and
President and Chief Technology Officer Jean Nichols, Ph.D., for their
contributions to Seragen and to the transition. Since the two companies agreed
to merge in May, employees at both Seragen and Ligand have been working
diligently to ensure a smooth transition and to realize shareholder value,"
continued Robinson.

        Paul V. Maier, Ligand senior vice president, chief financial officer and
newly appointed Seragen CEO commented: "I look forward to working with Jean
Nichols and the other dedicated professionals of Seragen and Marathan
Biopharmaceuticals, LLC toward realizing the value of the Seragen and Marathon
assets for Ligand shareholders, including the final activities for approval of
ONTAK."

        Ligand and Marathon Biopharmaceuticals, LLC, the organization which has
a service contract with Seragen for manufacturing and development services, are
parties to an agreement entered into simultaneously with the merger agreement
providing for Ligand's acquisition of substantially all of Marathon's assets for
$5 million, and an additional $3 million to be paid if and when Ligand pays the
$37 million payment in connection with the FDA clearance to market ONTAK for
CTCL. Ligand may purchase the assets of Marathon at any time before Dec. 24,
1998 or on Jan. 31, 1999, at Ligand's option. The payments to Marathon may be
paid in cash or Ligand Common Stock, at Ligand's option.

        Since 1989, Ligand Pharmaceuticals Incorporated has established a
leadership position in gene transcription technology, particularly intracellular
receptor (IR) technology and STATs technology. Ligand has applied IR and STATs
technology to the discovery and development of small molecule drugs to enhance
therapeutic and safety profiles and to address major unmet patient needs in
cancer, women's and men's health, skin diseases, osteoporosis, and
cardiovascular and inflammatory disease.

        Seragen Inc. is a biotechnology company developing receptor-targeted
fusion proteins for cancer and dermatology. Fusion proteins consist of a toxin
fragment genetically fused to a hormone, or growth factor, that targets specific
receptors on the surface of disease-causing cells.

        This news release may contain certain forward looking statements and
actual results could differ materially from those described as a result of
factors including, but not limited to, the following: there can be no assurance
that any product in the Ligand or Seragen pipeline will be successfully
developed, that final data will be consistent with interim data, that regulatory
approvals, including labeling approvals, will be granted in a timely manner, or
at all, that patient and physician acceptance of these products will be
achieved, that final results will be supportive of regulatory approvals required
to market products, that regulatory filings will be made in a timely manner,
that upon filing they will be accepted for submission, that Ligand will be able
to build and timely deploy sales support or product launch, or that third
parties on which Ligand will rely for crucial components of commercialization
will perform adequately. Ligand undertakes no obligation to update the
statements contained in this press release after the date hereof.

        New shareholders are invited to contact Ligand Investor Relations at
619/550-7687.

        Ligand Pharmaceuticals' releases are available via fax at no charge by
calling 888/329-9832 or on the world wide web at
www.businesswire.com/cnn/lgnd.htm.

CONTACT:   Ligand Pharmaceuticals Incorporated
           Susan Atkins, 619/550-7687



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