DIGITAL BIOMETRICS INC
SC 13D, 1997-01-16
COMPUTER PERIPHERAL EQUIPMENT, NEC
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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)*

 
 
                           Digital Biometrics, Inc.
- ------------------------------------------------------------------------------- 
                               (Name of Issuer)
 
 
                    Common Stock, par value $.01 per share
- ------------------------------------------------------------------------------- 
                        (Title of Class of Securities)
 
 
                                   253833107
                  ------------------------------------------
                                (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)
 
 
                                January 9, 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. 253833107                                    
- -----------------------                                  
 
- ------------------------------------------------------------------------------
      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
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      U.S.
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
                          Reporting person has voting and dispositive power over
     NUMBER OF            (i) 8% Convertible Debentures which are convertible
                          into 719,232 shares of Common Stock, par value $.01
      SHARES              per share, as of the date for the filing of this
                          statement and (ii) 156 shares of Common Stock, par
   BENEFICIALLY           value $.01 per share.
                   -----------------------------------------------------------
     OWNED BY             SHARED VOTING POWER
                     8
       EACH
                          -0-
    REPORTING      -----------------------------------------------------------
                          SOLE DISPOSITIVE POWER
      PERSON         9

       WITH               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    
      6.21% as of the date for the filing of this statement. (Based on 
      10,873,687 shares of Common Stock issued and outstanding as of November 
      30, 1996 plus the shares of Common Stock 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 and the shares of
          Common Stock into which the Convertible Securities are convertible. As
          of the date for the filing of this statement, Nelson and Olympus
          collectively owned Convertible Securities for which they originally
          paid $1,200,000 ("Stated Value") and 156 shares of Common Stock.

          As of any date ("Conversion Date") all or a portion of the Convertible
          Securities may be converted into the number of shares of Common Stock
          determined by dividing the Stated Value of such securities (plus an
          amount equal to 8% interest on the Stated Value of such securities
          from the Closing Date) by a conversion price ("Conversion Price"). The
          Conversion Price is equal to the lesser of (i) $7.00 ("Fixed
          Conversion Price") and (ii) 85% of the average closing bid 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 ("Floating
          Conversion Price").

          If the Company's Common Stock is trading at a price less than $8.24,
          the Conversion Price will fluctuate depending upon the closing bid
          price of the Issuer's Common Stock. As a consequence, 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 719,388 shares of Common Stock representing 6.21% of the Issuer's
          Common Stock (based on (i) 10,873,687 shares of Common Stock issued
          and outstanding as of November 30, 1996 (as set forth in the Issuer's
          most recently filed 10-Q) and (ii) a Conversion Price equal to
          $1.8381).

     (b)  Citadel has the sole power to vote and the sole power to dispose of
          the Convertible Securities and the Common Stock into which the
          Convertible Securities are convertible on behalf of each 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 January 9, 1997:
<TABLE>
<CAPTION>


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

<S>                 <C>                  <C>            <C>         <C>
1/9/97              Nelson               Sell             25,000     2.52
1/9/97              Nelson               Sell             95,000     2.39
1/8/97              Nelson               Sell             27,000     2.38
1/6/97              Nelson               Sell              7,500     2.12
1/3/97              Nelson               Sell             25,000     2.12

</TABLE>
<PAGE>

   (d)  Nelson and Olympus, as the direct beneficial and legal owners of the
        Convertible Securities, 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 and the Common Stock into which the
        Convertible Securities are convertible. However, Citadel, as managing
        general partner of Nelson and trading manager for Olympus, ultimately
        has the right to direct such activities.
<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:  January 14, 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
 
 


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