ENZO BIOCHEM INC
SC 13D/A, 1996-05-08
MEDICAL LABORATORIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                        
                          (Amendment No. 7)
                          --------------------



                               Enzo Biochem, Inc.
              -----------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
            --------------------------------------------------------
                         (Title of Class of Securities)

                                  294100102
           ----------------------------------------------------------
                                 (CUSIP Number)

                Nadine Shaoul, D.H. Blair Investment Banking Corp.
                44 Wall Street, New York, NY  10005 (212) 495-4163
         ------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                 Authorized to Receive Notices and Communications)

                             May 1, 1996
          -----------------------------------------------------------
            (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 this 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 the
disclosures provided in a prior cover page.

The information required in 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 1 of 9 pages

                            Exhibit Index - Page  6

<PAGE>

CUSIP No.  294100102                 13D                   Page 2 of 9 Pages



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

       J. Morton Davis


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)


- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            1,503,325
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             0
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             1,503,325
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       0
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                       1,627,380                      
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                       X
- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                       7.6%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    IN

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

CUSIP No.  294100102                 13D                   Page 3 of 9 Pages



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

       D.H. Blair Holdings, Inc.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)


- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            0
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             0
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             0
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       0
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                       0
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                       X
- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                       0%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    HC
 
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

CUSIP No.  294100102                 13D           Page 4 of 9 Pages



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

       D.H. Blair Investment Banking Corp.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)

       
- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            0
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             1,117,765
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             0
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       1,117,765
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      1,117,765
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                      X
- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    5.2%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    BD

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>

                                                            Page 5 of 9 Pages

          J. Morton Davis,  D.H. Blair Holdings,  Inc. ("Blair  Holdings"),
          and  D.H.  Blair  Investment  Banking  Corp.   ("Blair   Investment"),
          (collectively,  the  "Reporting  Parties")  hereby amend the following
          items in their statement on Schedule 13D relating to the common stock,
          $.01 par value ("shares") of Enzo Biochem,  Inc. (the "Issuer") as 
          follows:


Item 2. (c) is hereby amended in its entirety as follows:

          Mr. Davis is an investment  banker and sole  shareholder of Blair
          Investment  (1),  a  broker-dealer  registered  under  the  Securities
          Exchange  Act of 1934.  Prior to May 1, 1996,  Blair  Holdings (2) was
          solely owned by Mr. Davis,  and Blair  Investment  was a  wholly-owned
          subsidiary of Blair Holdings. As of May 1, 1996, Blair Holdings merged
          into Blair  Investment,  with  Blair  Investment  being the  surviving
          corporation.


Item 3. (a) is hereby amended in its entirety as follows:

          This Statement relates to the purchase of 1,102,465 shares by
          Blair Investment with its general funds for a total purchase price
          of approximately $5,707,670.  Rosalind Davidowitz (3) used her
          personal funds to purchase 82,265 shares for a total purchase price
          of approximately $1,347,561.00, and Rivkalex Corporation (3) used
          its general funds to purchase 41,790 shares for an approximate
          purchase price of $331,612.00.  Engex, Inc. (4) used its general
          funds to purchase 385,560 shares for an approximate total purchase
          price of $3,041,243.00.          

  
Item 4. is hereby partially amended by deleting the first sentence and
and substituting the following sentence therein:

          This  Amendment is filed solely to report that Blair Holdings has
          ceased  to be a  beneficial  owner of more than  five  percent  of the
          Issuer's  securities  as a result of its merger  into its  subsidiary,
          Blair Investment.


    __________________________________________________________________________
(1) See attached Exhibit B indicating the executive officers and directors
of Blair Investment and providing information called for by Items 2-6 of this 
Schedule 13D.
(2) See attached Exhibit C indicating the executive officers and directors
of Blair Holdings and providing information called for by Items 2-6 of this 
Schedule 13D.
(3) Rivkalex Corporation ("Rivkalex") is a private corporation owned by Mr.
Davis' wife, Rosalind  Davidowitz.  Filing of this statement shall not be deemed
an  admission  by J.  Morton  Davis  that he  beneficially  owns the  securities
attributed to Rivkalex or Rosalind  Davidowitz for any purpose.  J. Morton Davis
expressly disclaims  beneficial  ownership of all securities held by Rivkalex or
Rosalind Davidowitz for any purpose.
(4) Engex, Inc. ("Engex") is an investment company registered under Section 8
of the Investment Company Act.  Mr. Davis is reporting as a beneficial owner
of the securities owned by Engex because of his role as investment advisor to
Engex.  Filing of this statement shall not be deemed an admission by J. Morton
Davis that he beneficially owns the securities attributed to Engex for any
purpose.  J. Morton Davis expressly disclaims beneficial ownership of all 
securities held by Engex for any purpose.

<PAGE>
                                                    Page 6 of 9 pages
 
 
Item 5. (a) is hereby amended in its entirety as follows:

          As of May 1, 1996, Mr. Davis may be deemed to beneficially own (5)
          1,627,380 shares or 7.6% of the Issuer's shares issued and 
          outstanding as follows: (i) 1,102,465 shares, and warrants to 
          purchase 15,300 shares until June 26, 1996, owned directly by Blair 
          Investment, (ii) 385,560 shares owned by Engex, Inc., (iii) 82,265
          shares owned by Rosalind Davidowitz, and (iv) 41,790 shares owned
          by Rivkalex Corporation.


          As of May 1, 1996,  Blair Holdings does not  beneficially own any
          of  the  Issuer's  shares,  and  Blair  Investment  may be  deemed  to
          beneficially  own  1,117,765  shares  or 5.2% of the  Issuer's  shares
          issued and outstanding as indicated in (i) above.

 
Item 5. (b) is hereby amended in its entirety as follows:

          Mr.  Davis  has sole  power to vote or to  direct  the  vote,  to
          dispose or to direct the  disposition  of those  shares owned by Blair
          Investment. Rosalind Davidowitz has sole power to dispose or to direct
          the  disposition of those shares owned directly by her and those owned
          by Rivkalex  Corporation.  Voting and dispositive  decisions regarding
          shares owned by Engex are made by Mr. Davis as Chairman of the Board.


Item 5. (c) is hereby amended by adding the following paragraphs thereto:
 
  
          In  the  sixty  days  prior  to  May  1,  1996,   the   following
          transaction  occurred:  on  March 6, 1996,  Engex purchased 5,400 
          shares in the open-market at $15.72 per share.

          As of May 1, 1996, Blair Holdings was merged into its
          subsidiary, Blair Investment, and is no longer in existence.

          No other transactions were made by the Reporting Parties in the
          previous sixty days.


Item 5. (e) is hereby amended by adding the following paragraph thereto:

          On May 1, 1996, Blair Holdings ceased to be a beneficial owner of
          more than five percent of the Issuer's securities.


Exhibit B - Exhibit B is hereby amended in its entirety and attached hereto.

Exhibit C - Exhibit C is hereby amended in its entirety and attached hereto.

____________________________________________________________________________

(5) Not included herein are 51,345 shares owned by Kinder Investments, L.P.
("Kinder").  Kenton E. Wood, the general partner of Kinder, is the Chairman
and Chief Executive Officer of D.H. Blair & Co., Inc. ("Blair") and a stock-
holder and Director of Blair.  Certain limited partners of Kinder are 
stockholders of Blair.  The limited partners of Kinder are the children and 
grandchildren of Mr. Davis.  Blair Investment, Blair Holdings, and Mr. Davis
disclaim for purposes of Section 13 or otherwise beneficial ownership of any
Enzo Biochem, Inc. shares owned by Kinder, Blair, or Mr. Wood.
Kinder disclaims for purposes of Section 13 or otherwise ownership of any
Enzo Biochem, Inc. shares owned by Blair, Blair Investment, Blair Holdings,
or Mr. Davis.

 
 
<PAGE>
                                                   
                                                  Page 7 of 9 pages 

                                   SIGNATURES

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


 
                                         /s/ J. Morton Davis
Date:    May 6, 1996                   _____________________________
         New York, New York             J. Morton Davis
                                        




 
                                        D.H. BLAIR HOLDINGS, INC.


                                         /s/ David Nachamie
Date:    May 6, 1996                 by_____________________________
         New York, New York              David Nachamie
                                         Treasurer
 



                                       D.H. BLAIR INVESTMENT BANKING CORP.


                                           /s/ David Nachamie
Date:    May 6, 1996                  by_____________________________
         New York, New York              David Nachamie
                                         Treasurer



                     
    

                                                       Page 8 of 9 pages

                              EXHIBIT B 



The name and principal occupation or employment, which in each instance is 
with D.H. Blair Investment Banking Corp. ("Blair Investment") located at 44 
Wall Street, New York, New York, 10005, of each executive officer and director
of Blair Investment is as follows:

                                             PRINCIPAL OCCUPATION
          NAME                                 OR EMPLOYMENT
  Davis, Joseph Morton                       President,
                                             Chief Executive Officer, Director,
                                             Chairman of the Board


  Nachamie, David                            Treasurer

  Bell, Martin A.                            Vice Chairman,
                                             General Counsel

  Wasserman, Brian A.                        Senior Vice President,
                                             Chief Financial Officer

Item 2. 
     During the last five years, none of the above persons (to the best of 
Blair Investments' knowledge) was convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors) or was a party to a civil 
proceeding of a judicial or administrative body of competent jurisdiction and
as a result or such proceeding was or is subject to 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.

Item 3. - 6. herein are amended by adding the following paragraphs thereto:
 
     See Mr. Davis' responses herein.

     As of May 1, 1996, Mr. Nachamie may be deemed to be the beneficial owner of
18,910  shares as follows;  (i) 15,120  shares  owned  directly by him, and (ii)
3,790  shares  owned  jointly  with his  wife,  Evelyn  Nachamie.  Mr.  Nachamie
disclaims  beneficial  ownership  of the  securities  owned  by his wife for any
purpose.  He owns these  securities for  investment  purposes only, and has sole
voting and dispositive control over any securities owned by him.
 
     Mr. Wasserman and Mr. Bell do not beneficially own any of the Issuer's 
shares.


    
   

                                                            Page 9 of 9 pages

                              EXHIBIT C

 
     The name and principal occupation or employment,  which in each instance is
with D.H. Blair Holdings, Inc. ("Blair Holdings") located at 44 Wall Street, New
York,  New  York,  10005,  of each  executive  officer  and  director  of  Blair
Investment is as follows:

                                             PRINCIPAL OCCUPATION
          NAME                                 OR EMPLOYMENT
  Davis, Joseph Morton                       President,
                                             Chief Executive Officer, Director,
                                             Chairman of the Board


  Nachamie, David                            Treasurer

  Bell, Martin A.                            Vice Chairman,
                                             General Counsel

  Wasserman, Brian A.                        Senior Vice President,
                                             Chief Financial Officer

Item 2. 
     During the last five years, none of the above persons (to the best of 
Blair Investments' knowledge) was convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors) or was a party to a civil 
proceeding of a judicial or administrative body of competent jurisdiction and
as a result or such proceeding was or is subject to 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.

Item 3. - 6. herein are amended by adding the following paragraphs thereto:
 
     See Mr. Davis' responses herein.

     As of May 1, 1996, Mr. Nachamie may be deemed to be the beneficial owner of
18,910  shares as follows;  (i) 15,120  shares  owned  directly by him, and (ii)
3,790  shares  owned  jointly  with his  wife,  Evelyn  Nachamie.  Mr.  Nachamie
disclaims  beneficial  ownership  of the  securities  owned  by his wife for any
purpose.  He owns these  securities for  investment  purposes only, and has sole
voting and dispositive control over any securities owned by him.
 
     Mr. Wasserman and Mr. Bell do not beneficially own any of the Issuer's 
shares.

 


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