LIDAK PHARMACEUTICALS
SC 13D, 1998-03-30
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                               (Amendment No. 1)

                    Under the Securities Exchange Act of 1934


                              LIDAK Pharmaceuticals

                                (Name of Issuer)

                  Class A Common Stock and Class B Common Stock

                         (Title of Class of Securities)

                                    531707107
                  ---------------------------------------------
                                 (CUSIP Number)

                                   -----------
                            Dennis J. Doucette, Esq.
                             Steven J. Davis, Esq.
                     Luce, Forward, Hamilton & Scripps LLP
                          600 West Broadway, Ste. 2600
                          San Diego, California 92101
                                 (619) 236-1414

   (Name, Address and Telephone Number of Person Authorized to Receive Notices
                              and Communications)

                                 March 27, 1998
        -----------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. __

Check the  following box if a fee is being paid with the statement __. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


<PAGE>




                                  SCHEDULE 13D



CUSIP No. 531707107                                                 
- -------------------------------------------- 


   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          David H. Katz, M.D.
          SS# ###-##-####

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*            (a) __
                                                                       (b)  x
          

   3      SEC USE ONLY


   4      SOURCE OF FUNDS*

          00   HealthMed,  Inc. is obligated to pay $1,528,234.98 to Dr. Katz as
               evidenced by the promissory note which was given as consideration
               for the shares sold by Dr. Katz and obligated to pay  $263,004.00
               to  Medical  Biology   Institute  ("MBI")  as  evidenced  by  the
               promissory note which was given as  consideration  for the shares
               sold by MBI.

   5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
          ITEMS 2(d) or 2(e)                                       __

          Not applicable.

   6      CITIZENSHIP OR PLACE OF ORGANIZATION

          California

                                  7      SOLE VOTING POWER
                                         -0-
          NUMBER OF
           SHARES
        BENEFICIALLY              8      SHARED VOTING POWER 
          OWNED BY                       -0-
            EACH
          REPORTING               9      SOLE DISPOSITIVE POWER
           PERSON                        Class A Common Stock: 3,344,696
            WITH                         Class B Common Stock:   385,000

                                 10      SHARED DISPOSITIVE POWER
                                         -0-

   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          Class A Common Stock:  3,344,696
          Class B Common Stock:    385,000

   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
          SHARES*                                                           __

   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
          Class A Common Stock:  8.1%
          Class B Common Stock:  88.7%

   14     TYPE OF REPORTING PERSON*
          IN


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>



                                  SCHEDULE 13D
                                       FOR
                               DAVID H. KATZ, M.D.

         This Amendment No. 1 amends and  supplements  the statement on Schedule
13D  dated  January  16,  1998,  filed on  behalf of David H.  Katz,  M.D.,  and
Amendment  No. 1 of the  Schedule  13D dated  March 16,  1998 filed on behalf of
HealthMed,  Inc. ("HealthMed"),  Mitchell J. Stein, David H. Katz, M.D., Wallace
O.  Reubenheimer  and George  Rutland,  relating to the Class A Common Stock and
Class B Common Stock  issued by Lidak  Pharmaceuticals  ("LIDAK"),  a California
corporation.

Item 1. Security and Issuer.

         Securities: Class A common stock, no par value ("Class A Common Stock")
                     Class B common stock, no par value ("Class B Common Stock")

         Issuer:           LIDAK Pharmaceuticals
                           11077 N. Torrey Pines Road
                           La Jolla, California 92037

Item 2.  Identity and Background.  This Schedule 13D is filed on behalf of 
                                   David H. Katz, M.D.

         a. Name: David H. Katz, M.D.

         b. Business Address:  c/o Medical Biology Institute  ("MBI"),  11077 N.
Torrey Pines Road, La Jolla, California 92037.

         c. Dr. Katz is President/Chief  Executive Officer and a director of MBI
and a director of LIDAK.

         d. During the last five years,  Dr.  Katz has not been  convicted  in a
criminal proceeding (excluding traffic violations or similar misdemeanors).

         e. During the last five years, Dr. Katz has not been a party to a civil
proceeding of a judicial or  administrative  body which  resulted in a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

         f. Citizenship: Dr. Katz is a citizen of the United States.

Item 3.  Source and Amount of Funds or Other Consideration.

         On January 12, 1998, Dr. Katz sold to HealthMed 308,100 shares of Class
A Common Stock and 70,200  shares of Class B Common  Stock for a total  purchase
price of  $1,528,234.98  pursuant to the terms of the Stock  Purchase  Agreement
(the "Katz Stock Purchase  Agreement") dated January 12, 1998 by and between Dr.
Katz and HealthMed, Inc., a Nevada corporation ("HealthMed"). The purchase price
was paid by HealthMed in the form of a  Promissory  Note dated  January 12, 1998
(the "Katz  Promissory  Note") in the  principal  amount of  $1,528,234.98.  The
maturity date of the Katz Promissory Note is January 12, 2000.

         On January 12, 1998, Medical Biology Institute,  a California nonprofit
public benefit corporation  ("MBI"),  sold to HealthMed 65,100 shares of Class A
Common Stock for a total purchase price of $263,004.00  pursuant to the terms of
the Stock Purchase Agreement ("MBI Stock Purchase  Agreement") dated January 12,
1998 by and between MBI and HealthMed.  The purchase price was paid by HealthMed
in the form of a Promissory Note (the "MBI  Promissory  Note") dated January 12,
1998 in the  principal  amount  of  $263,004.00.  The  maturity  date of the MBI
Promissory Note is January 12, 2000. Dr. Katz is the President,  Chief Executive
Officer and a director of MBI and may be deemed to beneficially  own any and all
shares of LIDAK over which MBI has the power to vote or dispose.

Item 4.  Purpose of Transaction.

         Dr. Katz and MBI completed the transactions  described herein to induce
HealthMed to make a significant  investment  in  LIDAK.


<PAGE>



         a. Not applicable.

         b. Not applicable.

         c. Not applicable.

         d. At the request of HealthMed  and to induce  HealthMed to make a $130
million  investment in LIDAK,  on January 12, 1998,  Dr. Katz sold a significant
portion of his holding of LIDAK  shares to  HealthMed  and placed his  remaining
LIDAK shares in a voting trust with HealthMed.  For the same purpose, on January
12, 1998,  MBI, of which Dr. Katz is a founder,  director and the  President and
Chief Executive Officer, also sold a significant portion of its holding of LIDAK
shares to HealthMed  and placed their  remaining  LIDAK shares in a voting trust
with HealthMed.  Neither Dr. Katz nor MBI received cash for the sale or transfer
of their LIDAK shares. Instead, Dr. Katz and MBI received promissory notes which
are not  payable for two years.  The sole  purpose for Dr. Katz and MBI to enter
into the transactions  with HealthMed was to maximize LIDAK shareholder value by
ensuring LIDAK secured the financing  necessary to bring its  anti-herpes  drug,
LIDAKOL, to market.

         As a result of the sale and  transfer of shares by Dr. Katz and MBI, on
January  13,  1998,  HealthMed  provided  a  non-binding  letter  proposal  (the
"Proposal")  to LIDAK for a  non-dilutive  investment  of up to $130  million in
LIDAK to bring  LIDAKOL to  market.  On March 3, 1998,  HealthMed  withdrew  the
Proposal.  On March 4, 1998,  LIDAK  terminated  Dr. Katz as President and Chief
Executive  Officer of LIDAK. In so doing,  LIDAK arguably lost its most valuable
asset,  its principal  scientist who was a key player in developing  most of the
technologies which LIDAK hopes to bring to market.

         On March 16, 1998, HealthMed,  Mitchell J. Stein ("Stein"),  Wallace O.
Raubenheimer  ("Raubenheimer"),  George Rutland ("Rutland") and Dr. Katz filed a
joint  Schedule 13D to report the existence of a group (the  "Group")  formed to
achieve,  among  other  objectives,  voting  control  over a majority of LIDAK's
outstanding  securities  and seek the election of three new members to the LIDAK
Board at the LIDAK 1998 Annual Meeting of Shareholders  (the "Annual  Meeting").
On March 16, 1998,  Raubenheimer filed a preliminary Proxy Statement (the "Proxy
Statement") on behalf of a shareholders committee (the "Shareholders Committee")
comprised of  Raubenheimer  and HealthMed which sought the election of Edward L.
Hennessey, Jr. ("Hennessey"), Raubenheimer and Rutland to the LIDAK Board at the
Annual Meeting.

         In a press  release  dated March 25, 1998,  LIDAK  reported that LIDAK,
HealthMed, Stein, Raubenheimer,  Rutland and Hennessey entered into a Settlement
Agreement (the "Settlement  Agreement") which provides for the withdrawal of the
Proxy Statement,  a change in the present Board, and by-law amendments to change
the number of directors and to stagger the terms of the directors.  Dr. Katz has
not been provided an executed copy of the Settlement  Agreement.  The Settlement
Agreement  was  entered  into over the  objections  of Dr.  Katz and without his
endorsement.  Dr. Katz objected  because the Group failed to achieve its primary
objective of removing enough existing directors to gain control of the Board and
redirecting LIDAK toward maximizing shareholder value.

         Dr.  Katz is no longer a part of the  Group.  Dr.  Katz  disclaims  the
existence of any group to which he or MBI is a party  relative to the  ownership
of any securities of LIDAK.

         e. Pursuant to the terms of the Proposal,  HealthMed proposed to make a
non-dilutive  investment  of up to $130  million  into LIDAK.  On March 3, 1998,
Healthmed withdrew the Proposal.

         f. Not applicable.

         g. Not applicable.

         h. Not applicable.

         i. Not applicable.

         j. Not applicable.
<PAGE>

Item 5.  Interest in Securities of the Issuer.

         a. Dr.  Katz is the  beneficial  owner of  3,344,696  shares of Class A
Common Stock and 385,000 shares of Class B Common Stock.  Dr. Katz may therefore
by deemed to beneficially  own 8.1% of the Class A Common Stock  outstanding and
88.7% of the Class B Common  Stock  outstanding.  Pursuant  to the  Articles  of
Incorporation  of LIDAK,  each share of Class A Common Stock entitles the holder
to one vote and each share of Class B Common  Stock  entitles the holder to five
votes upon any and all  matters  submitted  to the  shareholders  of LIDAK for a
vote.

         The  calculation of the percentage of shares  beneficially  owned as of
the date  hereof  is based on  LIDAK's  From  10-K  for the  Fiscal  Year  Ended
September 30, 1997 in which LIDAK reported there were 38,742,511 shares of Class
A  Common  Stock  outstanding  and  283,000  shares  of  Class  B  Common  Stock
outstanding  as of  December  29,  1997.  The  calculation  gives  effect to the
automatic  conversion of 163,800  shares of Class B Common Stock  transferred by
Dr. Katz into the voting trust (see Item 5b. below) into 163,800 shares of Class
A Common  Stock and 70,200  shares of Class B Common Stock sold by Dr. Katz into
70,200  shares  of  Class  A  Common  Stock  as  required  by  the  Articles  of
Incorporation  of LIDAK.  The  calculation  also gives effect to (i) Dr.  Katz's
exercise of his stock  options (the  "Options")  which grant to him the right to
purchase  1,877,000 shares of Class A Common Stock and 375,000 shares of Class B
Common  Stock,  (ii) Dr.  Katz's  exercise  of his Class D Warrants  to purchase
386,190  shares of Class A Common Stock,  (iii) Dr.  Katz's  wife's  exercise of
options to purchase  10,000 shares of Class B Common Stock,  and (iv) Dr. Katz's
wife's exercise of options to purchase 46,903 shares of Class A Common Stock and
results,  for purposes of calculating the percent of class beneficially owned by
Dr. Katz in there being  41,286,604  shares of Class A Common  Stock  issued and
outstanding  and 434,000 shares of Class B Common Stock issued and  outstanding.
The Options are  exercisable  within 60 days.  The  1,877,000  shares of Class A
Common Stock and 375,000  shares of Class B Common Stock  underlying the Options
are therefore beneficially owned by Dr. Katz.

         b. On January 12, 1998, Dr. Katz transferred  718,903 shares of Class A
Common  Stock and  163,800  shares of Class B Common  Stock into a voting  trust
controlled by HealthMed pursuant to the terms of the Voting Trust Agreement (the
"Katz Voting Trust  Agreement")  dated  January 12, 1998 by and between Dr. Katz
and HealthMed.  Upon this  transfer,  the 163,800 shares of Class B Common Stock
automatically  converted to 163,800 shares of Class A Common Stock. HealthMed is
the sole  trustee of the voting  trust and has the sole power to vote the shares
of Class A Common  Stock and Class B Common  Stock.  The term of the Katz Voting
Trust  Agreement  is ten (10) years.  During the term of the Katz  Voting  Trust
Agreement,  Dr. Katz must place in trust all shares of Class A Common  Stock and
Class B Common  Stock  purchased  or received by him from any source.  Under the
terms of the Katz  Voting  Trust  Agreement,  Dr. Katz may dispose of all of the
Class A Common Stock and Class B Common Stock held in trust; provided,  however,
Dr. Katz may not dispose of more than twenty percent (20%) of the shares held in
trust  within any thirty (30) day period.  Dr. Katz is the  beneficial  owner of
these 882,703 shares of Class A Common Stock.

         As part of the same transaction,  Dr. Katz and HealthMed entered into a
Purchase Rights Agreement (the "Katz Purchase Rights  Agreement")  dated January
12, 1998 pursuant to which Dr. Katz granted  HealthMed the irrevocable  right to
receive  31.5% of the net  proceeds  (as  defined  in the Katz  Purchase  Rights
Agreement)  received  by Dr. Katz upon the  exercise of the Options  and, in the
event of the death or  incapacitation  of Dr. Katz, 31.5% of the shares received
by Dr. Katz upon the  exercise  of the  Options.  The term of the Katz  Purchase
Rights Agreement expires on June 21, 2007.


<PAGE>

 

         On January 12, 1998, MBI  transferred  151,900 shares of Class A Common
Stock into a voting trust  controlled by HealthMed  pursuant to the terms of the
Voting Trust Agreement (the "MBI Voting Trust Agreement") dated January 12, 1998
by and between MBI and  HealthMed.  HealthMed  is the sole trustee of the voting
trust  and has the sole  power to vote the  shares  of Class A Common  Stock and
Class B Common  Stock.  The term of the MBI Voting  Trust  Agreement is ten (10)
years.  During the term of the MBI  Voting  Trust  Agreement,  MBI must place in
trust all shares of Class A Common Stock and Class B Common  Stock  purchased or
received  by it from  any  source.  Under  the  terms  of the MBI  Voting  Trust
Agreement, MBI may dispose of all of the Class A Common Stock and Class B Common
Stock held in trust; provided,  however, MBI may not dispose of more than twenty
percent (20%) of the shares held in trust within any thirty (30) day period. Dr.
Katz is deemed to beneficially own these 151,900 shares of Class A Common Stock.

         c. Dr. Katz has not entered into any agreements relating to the 
securities of LIDAK since  January 12, 1998 which were reported in his Schedule
13D filed on January 16, 1998.

         d. Not applicable.

         e. Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationship with Respect 
         to Securities of the Issuer.

         The discussion herein regarding the (i) Katz Stock Purchase  Agreement,
(ii) Katz Purchase Rights  Agreement,  (iii) Katz Voting Trust  Agreement,  (iv)
Katz Promissory  Note, (v) MBI Stock Purchase  Agreement,  (vi) MBI Voting Trust
Agreement, (vii) MBI Promissory Note is hereby incorporated into this Item 6.

Item 7.  Material to be Filed as Exhibits.  

         The following are incorporated by reference from the Schedule 13D filed
on behalf of Dr. Katz on January 16, 1998:

         Exhibit 4.1:         Katz Stock Purchase Agreement
         Exhibit 4.2:         Katz Purchase Rights Agreement
         Exhibit 9.1:         Katz Voting Trust Agreement
         Exhibit 10.1:        Katz Promissory Note


<PAGE>


         Exhibit 4.3:         MBI Stock Purchase Agreement
         Exhibit 9.2:         MBI Voting Trust Agreement
         Exhibit 10.2:        MBI Promissory Note
         Exhibit 99.1:        Proposal

Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:    March 30, 1998


                                            /s/ David H. Katz
                                            -----------------------------------
                                            David H. Katz, M.D.







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