SABRATEK CORP
SC 13D/A, 1999-07-30
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.7)*

                              Sabratek Corporation
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                  78571 U 10 8
                                 (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 Notes and Communications)

                                  July 21, 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 [_]. (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 13a-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>   2

                                  SCHEDULE 13D
- -----------------------------           ----------------------------------------
CUSIP NO.  78571 U 10 8                   Page     2    of    4   Pages
- -----------------------------           ----------------------------------------

- --------------------------------------------------------------------------------
1         NAME OR 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           708,325
   NUMBER OF          ----------------------------------------------------------
     SHARES           8    Shared Voting Power           0
  BENEFICIALLY        ----------------------------------------------------------
    OWNED BY          9    Sole Dispositive Power      708,325
      EACH            ----------------------------------------------------------
   REPORTING          10   Shared Dispositive Power      0
     PERSON
      WITH

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  708,325
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

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

                  5.35%
- --------------------------------------------------------------------------------
14        TYPE OF PERSON REPORTING*

                  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
- --------------------------------------------------------------------------------


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<PAGE>   3


Item 1.  Security and Issuer.

         This Amendment to Schedule 13-D, dated July 30, 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 312,593 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 180,000 shares
with its own trust funds.

Item 4.  Purpose of Transaction.

NONE

Item 5.  Interest in Securities of the Issuer.

         As of July 30, 1999, Mr. Stewart is deemed to beneficially own 708,325
shares of Sabratek Common Stock (approximately 5.35% of the Sabratek Common
Stock outstanding), which includes 215,732 shares held of record by Charles K.
Stewart Money Purchase Plan, 180,000 shares held of record by Stewart Family
Children's Trust ("Trust"). The percentage of Sabratek Common Stock beneficially
owned by Mr. Stewart is calculated based upon the total number of shares of
Sabratek Common Stock outstanding as of the close of business on July 28, 1999.



                                       3

<PAGE>   4
         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
- ----               ----------------      ---------------      ------------
6/1/99             10,000                23-3/4               Mr. Stewart
6/2/99             20,000                24-15/16             Trust
6/4/99             20,000                28-5/8               Trust
6/9/99             10,000                26-3/8               Trust
6/15/99            10,000                20-11/16             Trust
6/16/99            10,000                20-3/4               Trust
6/17/99            10,000                22-13/16             Trust
6/29/99            10,000                21-5/8               Mr. Stewart
6/29/99             6,000                22-1/2               Mr. Stewart
6/29/99             4,000                22-7/16              Mr. Stewart
6/29/99             5,000                22-3/8               Mr. Stewart
6/29/99            10,000                22-5/8               Trust
7/1/99              5,676                (1)                  Mr. Stewart
7/6/99             10,000                24                   Mr. Stewart
7/6/99             10,000                24-7/16              Mr. Stewart
7/9/99              6,300                23-3/16              Mr. Stewart
7/15/99            10,000                27-3/8               Mr. Stewart
7/21/99             5,000                24-4/5               Mr. Stewart
7/22/99             5,000                25-1/2               Mr. Stewart
7/27/99             5,000                21-3/4               Mr. Stewart

- -----------------------------
(1)  Mr. Stewart acquired 5,676 shares of Sabratek Common Stock in
     connection with Sabratek's acquisition of Unitron Medical Communications,
     Inc. on July 1, 1999.

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

         NONE

Item 7.  Material to be Filed as Exhibits.

         NONE




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                                    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:   July 30, 1999

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
















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