MESIROW FINANCIAL HOLDINGS INC
SC 13G, 1998-02-17
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                 SCHEDULE 13G


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

                              IMNET SYSTEMS, INC.
- --------------------------------------------------------------------------------
                               (Name of Issuer)
                                        

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

                                   452921109
                              -------------------
                                (CUSIP Number)


Check the following box if a fee is being paid with this statement [_]. (A fee
is not required only if the filing 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 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).

                         (Continued on following pages)

                               Page 1 of 12 pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 452921109                13G                   PAGE 2 OF 10 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          MESIROW FINANCIAL HOLDINGS, INC.
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            648,156/1/        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          -0-
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             648,156/1/        
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          -0-

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          648,156/1/        

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
          6.6%                                                               

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          CO

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

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

/1/ Indirectly held through Mesirow Capital Partners V and Mesirow Capital 
    Partners VI.

                              Page 2 of 12 pages

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 452921109                13G                   PAGE 3 OF 10 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          MESIROW CAPITAL PARTNERS V
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          Illinois

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            520,287
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          -0-
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             520,287
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          -0-

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          520,287

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
          5.3%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 3 of 12 pages

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 452921109                13G                   PAGE 4 OF 10 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          MESIROW CAPITAL PARTNERS VI
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
  

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          Illinois

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            124,109
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          -0-
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             124,109
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          -0-

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          124,109

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
          1.3%                                                               

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 4 of 12 pages

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 452921109                13G                   PAGE 5 OF 10 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          Daniel P. Howell
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
  

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            3,760/1/
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          -0-
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             3,760/1/
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          -0-

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          3,760

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
          0.0%                                                               

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

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

/1/ Mr. Howell is an officer of the corporate general partners of Mesirow
    Capital Partners V and Mesirow Capital Partners VI. Mr. Howell disclaims
    beneficial ownership of these shares.

                              Page 5 of 12 pages
<PAGE>
 
Item 1(a) Name of Issuer:

          IMNET Systems, Inc.
          ----------------------------------------------------------------------

      (b) Address of Issuer's Principal Executive Offices:

          8601 Dunwoody Place
          ----------------------------------------------------------------------

          Atlanta, Georgia 30350
          ----------------------------------------------------------------------

Item 2(a) Name of Person Filing:

          The shares reported herein are held by Mesirow Capital Partners V,
          Mesirow Capital Partners VI and Mr. Daniel P. Howell. This filing is
          also made on behalf of Mesirow Financial Holdings, Inc., which is the
          ultimate parent corporation of (i) Mesirow Private Equity Investments,
          Inc., which is the corporate general partner of Mesirow Capital
          Partners V and (ii) Mesirow Financial Services, Inc., which is the
          corporate general partner of Mesirow Capital Partners VI. The persons
          on behalf of whom this Schedule 13G is being filed are represented on
          the Board of Directors of the Issuer by Mr. Daniel P. Howell.

      (b) Address of Principal Business Office:

          The address of the principal business office of each of the above-
          named persons is:

          350 North Clark Street
          Chicago, Illinois  60610

      (c) Citizenship:

          Mesirow Financial Holdings, Inc. is a Delaware corporation. Each of
          Mesirow Capital Partners V and Mesirow Capital Partners VI is an
          Illinois limited partnership. Mr. Howell is a United States citizen.

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

      (e) CUSIP Number:
          452921109
          ----------------------------------------------------------------------

                              Page 6 of 12 pages
<PAGE>
 
Item 3    If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
          check whether the person filing is a:

      (a)  ( )  Broker or Dealer registered under Section 15 of the Act

      (b)  ( )  Bank as defined in Section 3(a)(6) of the Act

      (c)  ( )  Insurance Company as defined in Section 3(a)(19) of the Act

      (d)  ( )  Investment Company registered under Section 8 of the Investment
                Company Act

      (e)  ( )  Investment Adviser registered under Section 203 of the
                Investment Advisers Act of 1940

      (f)  ( )  Employee Benefit Plan, Pension Fund which is subject to the
                provisions of the Employee Retirement Income Security Act of
                1974 or Endowment Fund

      (g)  ( )  Parent Holding Company, in accordance with (S)240.13d-1
                (b)(1)(ii)(G)

      (h)  ( )  Group, in accordance with (S)240.13d-1 (b)(1)(ii)(H)

Item 4  Ownership*
      (a)   Amount Beneficially Owned**    648,156 shares
                                           -------------------------------------

      (b)   Percent of Class               6.6%***
                                           -------------------------------------

      (c)   Number of shares as to which such person has:***
            (i)   Sole power to vote
                  or to direct the vote    648,156 shares
                                           -------------------------------------

            (ii)  Shared power to vote
                  or to direct the vote    -0-
                                           -------------------------------------

            (iii) Sole power to dispose or
                  to direct the
                  disposition of           648,156 shares
                                           -------------------------------------

            (iv)  Shared power to dispose
                  or to direct the
                  disposition of           -0-
                                           -------------------------------------

*  The beneficial ownership figures set forth in response to this Item 4 combine
   holdings separately reported on the cover pages hereof by each of the persons
   named in response to Item 1(a) above. Beneficial ownership of the same shares
   may be shared between the persons named above.

** The filing of this Schedule 13G shall not be construed as an admission that
   such person is, for the purposes of Section 13(d) and 13(g) of the Securities
   Exchange Act of 1934, the beneficial owner of any securities covered by this
   statement. Mr. Howell is an officer of the corporate managing general partner
   of each of Mesirow Capital Partners V and Mesirow Capital Partners VI. Mr.
   Howell disclaims beneficial ownership of such shares.

                              Page 7 of 12 pages
<PAGE>
 
*** The number of shares reported as being beneficially owned under Item 4(a)
    may be less than the aggregate number of shares being reported in Item 4(c)
    since more than one of the indices of beneficial ownership specified in Item
    4(c) may be present with respect to the same shares deemed to be
    beneficially owned.

                              Page 8 of 12 pages

<PAGE>
 
Item 5    Ownership of Five Percent or Less of a Class

               If this statement is being filed to report the fact that as of
               the date hereof the reporting person has ceased to be the
               beneficial owner of more than five percent of the class of
               securities, check the following [_].

Item 6    Ownership of More than Five Percent on Behalf of Another Person

               To the best of our knowledge, we are unaware of any other person
               having the right to receive or the power to direct the receipt of
               dividends from, or the proceeds from the sale of, such
               securities.

Item 7    Identification and Classification of the Subsidiary Which Acquired
          the Security Being Reported on by the Parent Holding Company.

                See Exhibit B attached.

Item 8    Identification and Classification of Members of the Group

                The attached Exhibit A states the identity of each member of the
                group filing this Schedule 13G.

Item 9    Notice of Dissolution of Group

                NOT APPLICABLE
                --------------------------------------------------------

Item 10  Certification

                NOT APPLICABLE
                --------------------------------------------------------

                              Page 9 of 12 pages
<PAGE>
 
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: February 12, 1998             MESIROW FINANCIAL HOLDINGS, INC.


                                     By /s/ James C. Tyree
                                        ------------------------------------
                                        Chairman and Chief Executive Officer

                                     MESIROW CAPITAL PARTNERS V

                                     By: Mesirow Private Equity
                                         Investments, Inc., Its General Partner



                                         By /s/ James C. Tyree
                                            ------------------------------------
                                            Chairman and Chief Executive Officer
 

                                     MESIROW CAPITAL PARTNERS VI

                                     By: Mesirow Financial Services, Inc., 
                                         Its General Partner

                                         By /s/ James C. Tyree
                                            ------------------------------------
                                            Chairman and Chief Executive Officer


                                     /s/ Daniel P. Howell
                                     --------------------
                                     DANIEL P. HOWELL

                              Page 10 of 12 pages
<PAGE>
 
                                   EXHIBIT A


     The undersigned, MESIROW FINANCIAL HOLDINGS, INC., a Delaware corporation,
MESIROW CAPITAL PARTNERS V, an Illinois limited partnership, MESIROW CAPITAL
PARTNERS VI, an Illinois limited partnership, and Daniel P. Howell hereby agree
that this 13G to which this Agreement is attached as an exhibit is filed on
behalf of each of them.

Dated: February 12, 1998             MESIROW FINANCIAL HOLDINGS, INC.


                                     By /s/ James C. Tyree
                                        ----------------------------------------
                                        Chairman and Chief Executive Officer

                                     MESIROW CAPITAL PARTNERS V

                                     By: Mesirow Private Equity
                                         Investments, Inc., Its General Partner



                                         By /s/ James C. Tyree
                                            ------------------------------------
                                            Chairman and Chief Executive Officer
 

                                     MESIROW CAPITAL PARTNERS VI

                                     By: Mesirow Financial Services, Inc., 
                                         Its General Partner

                                         By /s/ James C. Tyree
                                            ------------------------------------
                                            Chairman and Chief Executive Officer


                                     /s/ Daniel P. Howell
                                     -------------------------------------------
                                     DANIEL P. HOWELL

                              Page 11 of 12 pages


<PAGE>
 
                                   EXHIBIT B


     Identification of the Subsidiaries to which this filing relates is Mesirow
Financial Services, Inc. and Mesirow Private Equity Investments, Inc., as
further described in response to Item 2(a).

                              Page 12 of 12 pages


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