UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 8)*


                                A.M. Castle & Co.
--------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                    148411101
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                    12/31/03
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [ X ]  Rule 13d-1(b)

         [   ]  Rule 13d-1(c)

         [   ]  Rule 13d-1(d)


         *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).






                                  SCHEDULE 13G



CUSIP NO.
148411101
-------------------------------------------------------------------------------------------------------------------

                                                                                             
(1)   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

         BANK ONE CORPORATION, I.R.S. NO. 31-0738296

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(2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
         (a)      [  ]
         (b)      [  ]

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(3)   SEC USE ONLY

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(4)   CITIZENSHIP OR PLACE OF ORGANIZATION                                                        Illinois

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             NUMBER OF                      (5)  SOLE VOTING POWER                               2,300,080

              SHARES
                                            -----------------------------------------------------------------------
           BENEFICIALLY                     (6)  SHARED VOTING POWER                                     0

             OWNED BY
                                            -----------------------------------------------------------------------
               EACH                         (7)  SOLE DISPOSITIVE POWER                          2,300,080

             REPORTING
                                            -----------------------------------------------------------------------
              PERSON                        (8)  SHARED DISPOSITIVE POWER                                0

               WITH:
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(9)   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                               2,300,080

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(10)  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
                                                                                                     [   ]
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(11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                              14.6%

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(12)  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)                                                       HC

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                                  SCHEDULE 13G


                                                               
Item 1 (a).  Name of Issuer:                                         A.M. Castle & Co.

Item 1 (b).  Address of Issuer's Principal Executive Offices:        3400 N. Wolf Road
                                                                     Franklin Park, IL 60131

Item 2 (a).  Name of Person Filing:                                  BANK ONE CORPORATION

Item 2 (b).  Address of Principal Office or, if none, Residence:     One First National Plaza
                                                                     Chicago, IL  60670

Item 2 (c).  Citizenship:                                            Not Applicable

Item 2 (d).  Title of Class of Securities:                           Common Stock

Item 2 (e).  CUSIP Number:                                           148411101

Item 3.      If this Statement is Filed Pursuant to Rules 240.13d-1 (b), or 240.13d-2 (b) or (c),
             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) [ ]  An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

             (f) [ ]  An employee benefit plan or endowment fund in accordance with Section 240.13d-1(b)(1)(ii)(F);

             (g) [X]  A parent holding company or control person in accordance with Section 240.13d-1(b)(ii)(G);

             (h) [ ]  A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

             (i) [ ]  A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the
                      Investment Company Act of 1940 (15 U.S.C. 80a-3);

             (j) [ ]  Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

             If this statement is filed pursuant to Rule 13d-1(c), check this box. [ ]




                                  SCHEDULE 13G

Item 4.  Ownership:

         (a)      Amount Beneficially Owned:                         2,300,080

         (b)      Percent of Class:                                       14.6%

         (c)      Number of shares as to which the person has:

                     (i)    sole power to vote or direct the vote:
                                                                     2,300,080

                     (ii)   shared power to vote or direct the vote:         0

                     (iii)  sole power to dispose or direct the
                            disposition of:                          2,300,080

                     (iv)   shared power to dispose or direct the
                            disposition of:                                  0

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.

         Not Applicable.

Item 7.  Identification and Classification of the Subsidiary which acquired the
         Security being Reported on by the Parent Holding Company.

         Bank One Trust Company, N.A.
         One Group

Item 8.  Identification and Classification of Members of the Group.

         Not Applicable.

Item 9.  Notice of Dissolution of Group.

         Not Applicable.






                                  SCHEDULE 13G

Item 10. Certification.

         By signing below, I certify that, to the best of my knowledge and
         belief, the securities referred to above were acquired and are held in
         the ordinary course of business and were not acquired and are not held
         for the purpose of or with the effect of changing or influencing the
         control of the issuer of the securities and were not acquired and are
         not held in connection with or as a participant in any transaction
         having that purpose or effect.

         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:  February 9, 2004

         BANK ONE CORPORATION

         By:   /s/ David J. Kundert
               -------------------------------------
               Name:   David J. Kundert
               Title:  Executive Vice-President