SECURITIES EXCHANGE COMMISSION
                              Washington, DC 20549

                                 SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2 )

                             NORTHWEST PIPE COMPANY
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    667746101
                                 (CUSIP Number)

                                December 31, 2009
              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)


 

1) Name of Reporting Person: Pioneer Global Asset Management S.p.A. (PGAM)


2)    Check the Appropriate Box      (a)
      of A Member of  Group
      (See Instructions)             (b)

3)    SEC Use Only

4)    Citizenship of Place of
      Organization                               Italy

         Number of                                       (5)Sole Voting
         Shares                                             Power          0
         Beneficially Owned
         by Each Reporting
         Person With                                     (6)Shared Voting
                                                          Power         371,867
                                                          [See Item 4 below.]

                                                          (7)Sole Disposi-
                                                           tive Power      0


                                                          (8)Shared Disposi-
                                                           tive Power   371,867
                                                           [See Item 4 below.]

9)    Aggregate Amount Beneficially         371,867
      Owned by Each                    [See Item 4 below.]
      Reporting Person

10)   Check if the aggregate Amount in Row (9) Exclude Certain Shares (See
      Instructions)

11)   Percent of Class Represented
      By Amount in Row 9.                     4.0%

12)   Type of Reporting
      Person (See Instructions)               FI






Item 1(a)   Name of Issuer.

                NORTHWEST PIPE COMPANY

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

                  12005 N Burgard
                  P.O. Box 83149
                  Portland, OR 97203
                  United States

Item 2(a)   Name of Person Filing:

                PGAM

Item 2(b)  Address of Principal Business Office:

           The principal business office for PGAM is:
           Galleria San Carlo 6
           Milan, Italy

Item 2(c)  Citizenship:

           PGAM is organized under the laws of Italy.

Item 2(d)       Title of Class of Securities:

                Common Stock

Item 2(e)       Cusip Number:

                667746101

Item 3       The person filing this statement pursuant to Rule 13d-1(b)
             or 13d-2(b) is:

             PGAM is a parent holding company or control
             person in accordance with Section 240.13d-1(b)(1)(ii)(J).

Item 4.  Ownership.

(a) Amount Beneficially Owned: 371,867**

(b) Percent of Class: 4.0%


(c) Number of shares as to which such person has

         (i) sole power to vote or to direct the vote 0

         (ii) shared power to vote or to direct vote 371,867**

         (iii) sole power to dispose or to direct disposition of 0

         (iv) shared power to dispose or to direct disposition 371,867**

**Shares  reported on this  Schedule  13G (the  Shares) are owned by  collective
investment  vehicles  (Funds)  advised by  advisors  that are direct or indirect
wholly-owned  subsidiaries  of PGAM  (PGAM  Subsidiaries).  In  their  roles  as
investment  manager  or  adviser to the  Funds,  the PGAM  Subsidiaries  possess
investment and/or voting control over the Shares.

PGAM is a limited liability company and the holding company incorporating all of
the Pioneer  Investments asset management business (including PGAM Subsidiaries)
and may therefore, be deemed to beneficially own the Shares.

PGAM,  and the PGAM  Subsidiaries  disclaim  beneficial  ownership of the Shares
except to the extent or their respective  pecuniary  interests therein,  if any.
The filing of this Schedule 13G shall not be construed as an admission  that the
Reporting Persons are the beneficial owners of the Shares for any other purposes
than Section 13(d) of the Securities Exchange Act of 1934.

In  accordance  with  Securities  and Exchange  Commission  Release  No.34-39538
(January 12, 1998) (the"Release"),  this filing reflects the securities that may
be deemed to be beneficially owned by the Reporting Persons,  each of which is a
directly or indirectly owned subsidiary of Unicredit S.p.A. ("Unicredit").  This
filing does not reflect securities,  if any,  beneficially owned by Unicredit or
any other  subsidiaries of Unicredit whose ownership is disaggregated  from that
of the Reporting Persons in accordance with the Release.

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 here: [X]

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

         Inapplicable

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

         See Item 4.

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

         Inapplicable.

Item 9.  Notice of Dissolution of the Group.

         Inapplicable.

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.

     By  signing  below PGAM  certifies  that to the best of its  knowledge  and
belief, the foreign regulatory scheme applicable to it as a sub-holding  company
for the asset  management  division in the UniCredit  Banking Group,  the latter
being  regulated  by the  Bank of Italy  and the  Commissione  Nazionale  per le
Societa`e la Borsa  (CONSOB),  is  substantially  comparable  to the  regulatory
scheme applicable to the functionally equivalent U.S. institution(s).  PGAM also
undertakes to furnish to the Commission  staff,  upon request,  information that
would otherwise be disclosed in a Schedule 13D.

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.


                  Date: February 16, 2010

                  Pioneer Global Asset Management S.p.A




                  By: /s/ Roger Yates
                  Name:   Roger Yates
                  Title:  CEO; Head of Asset Management Division










                                     EXHIBIT

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)  promulgated  under the Securities  Exchange
Act of 1934,  the  undersigned  agree to the  joint  filing  of a  Statement  on
Schedule 13G  (including  any and all  amendments  thereto)  with respect to the
Common Stock of NORTHWEST  PIPE COMPANY and further  agree to the filing of this
agreement  as an  Exhibit  thereto.  Each  party  to  this  Agreement  expressly
authorizes  each other party to this Agreement to file on its behalf any and all
amendments to such Statement on Schedule 13G.

Date: February 16, 2010

Pioneer Global Asset Management S.p.A




By: /s/ Roger Yates
Name:   Roger Yates
Title:  CEO; Head of Asset Management Division