SABRATEK CORP
SC 13D/A, 1999-06-01
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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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)*


                              Sabratek Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                  78571 U 108
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                               Charles K. Stewart
  401 South LaSalle Street, Suite 1502, Chicago, Illinois 60605 (312) 786-9907
- --------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)


                                  May 28, 1999
- --------------------------------------------------------------------------------
            (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 /X/. (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 1 OF 5 PAGES
<PAGE>   2

                                  SCHEDULE 13D

CUSIP NO. 79571 U 108                                         PAGE 2 OF 4 PAGES
         ---------------------
- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Charles K. Stewart S.S.N.: ###-##-####
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [x]
                                                                         (b) [ ]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

          PF
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

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

          The United States of America
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
                         526,349
   SHARES      -----------------------------------------------------------------
                8   SHARED VOTING POWER
BENEFICIALLY
                            0
OWNED BY EACH  -----------------------------------------------------------------
                9   SOLE DISPOSITIVE POWER
  REPORTING
                         526,349
   PERSON      -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
    WITH
                            0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          526,349
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*                                                         [ ]

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

          5.32%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

          IN
- --------------------------------------------------------------------------------
                     *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>   3


Item 1.  Security and Issuer.

         This Amendment to Schedule 13-D, dated May 28, 1999, filed by Charles
K. Stewart, relates to the common stock, par value of $.01 per share (the
"Sabratek Common Stock"), of Sabratek Corporation, a Delaware corporation (the
"Issuer" or "Sabratek"). The principal executive offices of the Issuer are
located at 8111 North St. Louis Avenue, Skokie, Illinois 60076. All capitalized
terms used herein shall have the definitions set forth in the Schedule, except
as may otherwise be provided herein.

Item 2.  Identity and Background.

         This statement is being filed by Charles K. Stewart. His business
address is 401 South LaSalle Street, Suite 1502, Chicago, Illinois 60605.

         During the last five years, Mr. Stewart has never been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors), nor
has he been party to a civil proceeding of a judicial or administrative body of
competent jurisdiction as a result of which Mr. Stewart 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.  Source and Amount of Funds or Other Consideration.

         Mr. Stewart acquired 220,617 shares of Sabratek Common Stock with his
personal funds. Charles K. Stewart Money Purchase Plan acquired 215,732 shares
with its own funds and Stewart Family Children's Trust acquired 90,000 shares
with its own trust funds.

Item 4.  Purpose of Transaction.

NONE

Item 5.  Interest in Securities of the Issuer.

         As of May 28, 1999, Mr. Stewart is deemed to beneficially own 526,349
shares of Sabratek Common Stock (approximately 5.32 % of the Sabratek Common
Stock outstanding), which includes 215,732 shares held of record by Charles K.
Stewart Money Purchase Plan and 90,000 shares held of record by Stewart Family
Children's Trust ("Trust"). The percentage of Sabratek Common Stock outstanding
is calculated based upon the information contained in the Issuer's Form 10-Q for
the quarter ended March 31, 1999 as filed pursuant to the Securities Exchange
Act of 1934, as amended.

         Set forth below is the information with respect to purchases of
Sabratek Common Stock by Mr. Stewart on the Nasdaq National market, which
purchases constitute the only transactions in the Sabratek Common Stock by any
of the Reporting Persons during the last 60 days.

Date              Number of Shares          Price Per Share        Purchased By
- ----              ----------------          ---------------        ------------

5/20/99           40,000                    20 - 7/16              Trust
5/21/99           10,000                    19 - 13/16             Trust
5/21/99            2,500                    19 - 1/4               Trust


                                       3

<PAGE>   4


5/21/99            2,500                    19 - 3/8               Trust
5/21/99            5,000                    19 - 7/16              Trust
5/25/99           30,000                    18 - 1/2               Trust
5/26/99            5,000                    20 - 3/4               Mr. Stewart
5/26/99            2,000                    20 - 5/8               Mr. Stewart
5/26/99            3,000                    20 - 1/2               Mr. Stewart
5/26/99            2,000                    20 - 1/8               Mr. Stewart
5/26/99           10,000                    20 - 1/4               Mr. Stewart
5/26/99            8,000                    20 - 1/2               Mr. Stewart
5/28/99            3,100                    24                     Mr. Stewart
5/28/99            5,500                    24 - 1/2               Mr. Stewart
5/28/99            1,400                    24 - 3/8               Mr. Stewart
5/28/99           10,000                    24 - 7/16              Mr. Stewart

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

                  NONE

Item 7.  Material to be Filed as Exhibits.

                  NONE



                                    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.

Dated:   May 28, 1999

                                            By: /s/ Charles K. Stewart
                                                -------------------------------
                                                Name:  Charles K. Stewart

                                       4


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