CELGENE CORP /DE/
SC 13D, 1997-05-06
INDUSTRIAL ORGANIC CHEMICALS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 2)*


                              Celgene Corporation
________________________________________________________________________________
                               (Name of Issuer)


                      Common Stock, par value $.01 per share
________________________________________________________________________________
                         (Title of Class of Securities)


                                   151020104
        _______________________________________________________________
                                (CUSIP Number)


                              Charles H. Winkler
                          Citadel Limited Partnership
                          225 West Washington Street
                                   Suite 900
                               Chicago, IL 60606
                                (312) 696-2102
________________________________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)


                                 April 7, 1997
        _______________________________________________________________
            (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.)

* 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 1 of 5 Pages
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------
  CUSIP NO. 151020104
- -----------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                Citadel Limited Partnership
                FEIN No.: 36-3754834     
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4              AF
      
- ------------------------------------------------------------------------------
 5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e)                                         [_]
 
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
                U.S.
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF                   As of the date for the filing of this 
                                 statement, the reporting person has voting and
      SHARES                     dispositive power over (i) shares of Series A
                                 Preferred Stock which are convertible into
    BENEFICIALLY                 484,227 shares of Common Stock, (ii) Warrants
                                 exercisable into 26,088 shares of Common Stock
   OWNED BY EACH                 and (iii) 421,638 shares of Common Stock.
                   -----------------------------------------------------------
     REPORTING            SHARED VOTING POWER
                     8    
    PERSON WITH                  -0-
                                 
                   -----------------------------------------------------------
                          SOLE DISPOSITIVE POWER
                     9     
                                 See item 7 above.
                         
                   -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
                     10   
                                 -0-
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      See item 7 above.
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.95% as of the date for the filing of this statement. (Based on
      10,783,373 shares of Common Stock issued and outstanding as of March 1,
      1997, plus the Common Stock issuable upon the conversion and exercise of
      the securities referred to in item 7 above.)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      PN
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

                                                               Page 2 of 5 Pages
<PAGE>
 
     This is the second amendment to the Schedule 13D previously filed by the 
reporting person with respect to the securities of the issuer set forth on the 
cover page hereto (such initial filing, together with any prior amendments 
thereto, the "Prior Filing"). This amendment is being filed in order to amend 
and restate Item 5 of the Prior Filing in its entirety in connection with sales 
of the issuer's common stock by affiliates of the reporting person.

Item 5. Interest in Securities of the Issuer

     (a)  By reason of its serving as managing general partner of Nelson and
          trading manager of Olympus, Citadel may be deemed to be the indirect
          beneficial owner of the Convertible Securities, the shares of Common
          Stock into which the Convertible Securities are convertible or
          exercisable, as the case may be, and other shares of Common Stock
          owned by Nelson and Olympus. As of the date for the filing of this
          statement, Nelson and Olympus collectively owned Preferred Stock for
          which they originally paid $3,000,000 ("Preferred Stated Value"),
          Warrants exercisable into 26,088 shares of Common Stock and 484,227
          shares of Common Stock.

          As of any date (a "Conversion Date") all or a portion of the Preferred
          Stock may be converted into the number of shares of Common Stock
          determined by adding (i) the quotient determined by dividing the
          Preferred Stated Value of such securities by a conversion price
          ("Preferred Face CP") equal to the lesser of (A) $18.81 and (B) 85% of
          the average closing price (as reported by NASDAQ or such other market
          or exchange as the Common Stock is then traded) of the Issuer's Common
          Stock for the five trading days immediately preceding the Conversion
          Date and (ii) the quotient determined by dividing an amount equal to
          4.9% interest on the Preferred Stated Value of such securities from
          the Preferred Closing Date by a conversion price ("Preferred Accretion
          CP") equal to the average closing price (as reported by NASDAQ or such
          other market or exchange as the Common Stock is then traded) of the
          Issuer's Common Stock for the 30 calendar days immediately preceding
          the Conversion Date.

          As a result, (i) if the Company's Common Stock is trading at a price
          less than $20.90, the Preferred Face CP will fluctuate depending upon
          the closing trade price of the Issuer's Common Stock, and (ii) the
          Preferred Accretion CP will fluctuate depending upon the closing trade
          price of the Issuer's Common Stock.

          As a consequence of the fluctuation in the Preferred Face CP and
          Preferred Accretion CP, the number of shares of Common Stock into
          which the Convertible Securities may be converted, and consequently
          the number of shares of such securities which Citadel may be deemed to
          beneficially own, may fluctuate on a daily basis based solely on the
          Common Stock's market price and without any action taken by Citadel,
          Nelson or Olympus.

          As of the date for the filing of this statement, by virtue of its
          status as the managing general partner of Nelson and the trading
          manager for Olympus, Citadel may be deemed to be the beneficial owner
          of 931,953 shares of Common Stock representing 7.95% of the Issuer's
          Common Stock (based on (i) 10,783,373 shares of Common Stock issued
          and outstanding as reported by the Issuer as of March 1, 1997 in its
          most recent Form 10-K, (ii) a Preferred Face CP of $6.4607 and (iii) a
          Preferred Accretion CP of $8.0217).

     (b)  Citadel has the sole power to vote and the sole power to dispose of
          the Convertible Securities, the shares of Common Stock into which the
          Convertible Securities are convertible or exercisable, as the case may
          be, and the shares of Common Stock held by Nelson and Olympus, in each
          case, on behalf of Nelson and Olympus.

     (c)  The following transactions with respect to the Issuer's common stock
          have been effected during the 61-day period ending April 7, 1997:



Transaction Date   Transacting Party   Transaction   Quantity   Price
- ----------------   -----------------   -----------   --------   -----

March 11, 1997     Nelson              Sell          3,350      $8.25
March 11, 1997     Olympus             Sell          1,650      $8.25
April 7, 1997      Nelson              Sell          20,000     $7.37

     (d)  Nelson and Olympus, as the direct beneficial and legal owners of the
          Convertible Securities and the shares of Common


                                                               Page 3 of 5 Pages
<PAGE>
 
Stock, have the right to receive or the power to direct the receipt of dividends
from, or the proceeds from the sale of the Convertible Securities, the Common 
Stock into which the Convertible Securities are convertible or exercisable, as 
the case may be, and the Common Stock held by them. However, Citadel, as 
managing general partner of Nelson and trading manager for Olympus, ultimately 
has the right to direct such activities.


                                                               Page 4 of 5 Pages
<PAGE>

                                   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:  May 5, 1997                       Citadel Limited Partnership

                                         By:  GLB Partners, L.P.,
                                              its general partner

                                         By:  Citadel Investment Group, L.L.C.,
                                              its general partner

                                         By:  /s/Kenneth C. Griffin,
                                              ----------------------
                                              its manager


                                                               Page 5 of 5 Pages


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