SECURITIES AND EXCHANGE COMMISSION
                       Washington, D.C. 20549

                        ____________________

                            SCHEDULE 13G
                           (Rule 13d-102)

       INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
     TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
                      PURSUANT TO RULE 13d-2(b)
                          (Amendment No. )*

                           BELDEN CDT INC
     ___________________________________________________________
                          (Name of Issuer)


                            COMMON STOCK
     ___________________________________________________________
                   (Title of Class of Securities)


                              077454106
                   ______________________________
                           (CUSIP Number)

                          December 31, 2006
     ___________________________________________________________
       (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  disclosures  provided in a
prior cover page.

     The  information  required on the  remainder  of this 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.)














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CUSIP         No            13G             Page 2 of 5
077454106                                      Pages
- -----------------                          --------------



- ---------------------------------------------------------
  1    NAMES OF REPORTING PERSONS
       I.R.S.   IDENTIFICATION   NO.  OF  ABOVE  PERSONS
       (ENTITIES ONLY):

       Columbia Wanger Asset Management, L.P.
       04-3519872

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  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
       (a) [ ]
                                           (b) [ ]
- ---------------------------------------------------------
- ---------------------------------------------------------
  3    SEC USE ONLY


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

                                                Delaware
- ---------------------------------------------------------
- ---------------------------------------------------------
                                               2,147,000
               5  SOLE VOTING POWER
  NUMBER OF
    SHARES
 BENEFICIALLY
OWNED BY EACH
  REPORTING
 PERSON WITH

- ---------------------------------------------------------
- ---------------------------------------------------------
                                                 160,000
               6  SHARED VOTING POWER
- ---------------------------------------------------------
- ---------------------------------------------------------

               7  SOLE DISPOSITIVE             2,307,000
               POWER
- ---------------------------------------------------------
- ---------------------------------------------------------
               8  SHARED DISPOSITIVE
               POWER
- ---------------------------------------------------------
- ---------------------------------------------------------
  9    AGGREGATE  AMOUNT   BENEFICIALLY  OWNED  BY  EACH
       REPORTING PERSON
                                               2,307,000
- ---------------------------------------------------------
- ---------------------------------------------------------
  10   CHECK  IF  THE   AGGREGATE   AMOUNT  IN  ROW  (9)
       EXCLUDES CERTAIN SHARES*

                                                    [  ]
- ---------------------------------------------------------
- ---------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                                                   5.24%
- ---------------------------------------------------------
- ---------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

                                                      IA
- ---------------------------------------------------------
                *SEE INSTRUCTIONS BEFORE FILLING OUT!










Item 1(a).    Name of Issuer:

         BELDEN CDT INC

Item 1(b).    Address of Issuer's Principal Executive Offices:

         7701 Forsyth Boulevard
         Suite 800
         St Louis, MO 63105

Item 2(a).    Name of Person Filing:

         Columbia Wanger Asset Management, L.P.

Item 2(b).    Address  of  Principal  Business  Office  or,  if None,
         Residence:

         227 West Monroe Street, Suite 3000, Chicago, IL  60606.

Item 2(c).    Citizenship:

         Delaware

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

         Common Stock

Item 2(e).    CUSIP Number:

         077454106

Item 3.  If This  Statement is Filed  Pursuant to Rule  13d-1(b),  or
         13d-2(b) or (c), Check Whether the Person Filing is a:

         (a)  [ ] Broker or dealer  registered  under  Section 15  of
         the Exchange Act.
         (b)  [  ]  Bank  as  defined  in   Section 3(a)(6)   of  the
         Exchange Act.
         (c)  [ ]  Insurance  company as defined in  Section 3(a)(19)
              of the Exchange Act.
         (d)  [ ] Investment  company  registered  under Section 8 of
              the Investment Company Act.
         (e)  [X]  An   investment   adviser   in   accordance   with
         Rule 13d-1(b)(1)(ii)(E).
         (f)  [ ] An  employee  benefit  plan  or  endowment  fund in
              accordance with Rule 13d-1(b)(1)(ii)(F).
         (g)  [ ] A parent  holding  company  or  control  person  in
              accordance with Rule 13d-1(b)(1)(ii)(G).
         (h)  [ ] A savings  association  as defined in  Section 3(b)
              of the Federal Deposit Insurance Act.
         (i)  [  ]  A  church   plan  that  is   excluded   from  the
              definition  of  an  investment  company  under  Section
              3(c)(14) of the Investment Company Act.
         (j)  [  ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

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

Item 4.  Ownership:

         With respect to the  beneficial  ownership of the  reporting
         person,  see Items 5 through  11 of the cover  pages to this
         Schedule 13G, which are incorporated herein by reference.

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 or Control Person:

         Not applicable.

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

         Not applicable.

Item 9.  Notice of Dissolution of Group:

         Not applicable.







Item 10. Certification:

         By signing below each of the undersigned  certifies that, to
         the best of such  undersigned's  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 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:   January 11, 2007

                              Columbia Wanger Asset Management, L.P.

                              By:   /s/ Bruce H. Lauer
                                _____________________
                              Bruce H. Lauer,
                              Senior Vice President and Secretary,
                              WAM  Acquisition   GP,  Inc.,   General
                              Partner