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