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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G/A
Under the Securities Exchange Act of 1934
(Amendment No.*)
3
(Name of Issuer)
NORTHWEST PIPE CO
(Title of Class of Securities)
COMMON STOCK
(CUSIP Number)
667746101
(Date of Event Which Requires Filing of this Statement)
DECEMBER 31, 2002
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 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).
Potential persons who are to respond to the collection of information contained
in this form are not required to respond unless the form displays a currently
valid OMB control number.
SEC 1745 (3-98) Page 1 of 6 pages
CUSIP No. Page 2 of 6 Pages
667746101
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1 NAME OF REPORTING PERSONS
IRS IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
FRONTIER CAPITAL MANAGEMENT CO., LLC.
--------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
(a) [ ]
(b) [ ]
--------------------------------------------------------------------------------
3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
DELAWARE
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NUMBER OF 5 SOLE VOTING POWER 422,550
SHARES
BENEFICIALLY ----------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH
REPORTING ----------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER 422,550
WITH
----------------------------------------------------
8 SHARED DISPOSITIVE POWER
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
422,550
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10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(See Instructions)
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
6.45%
--------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON (See Instructions)
IA
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CUSIP No. 13G/A Page 3 of 6 Pages
667746101
ITEM 1.
(a) Name of Issuer:
NORTHWEST PIPE CO
(b) Address of Issuer's Principal Executive Offices:
12005 N. BURGARD
PORTLAND, OREGON 97203
ITEM 2.
(a) Name of Person Filing:
FRONTIER CAPITAL MANAGEMENT LLC.
(b) Address of Principal Business Office:
99 SUMMER STREET, BOSTON, MA 02110
(c) Citizenship:
DELAWARE
(d) Title of Class of Securities:
COMMON STOCKS
(e) CUSIP Number:
667746101
CUSIP No. 13G/A Page 4 of 6 Pages
667646101
ITEM 3. If this statement is filed pursuant to rule 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 (15
U.S.C. 78o).
(b) [ ] Bank as defined in section 3(a)(6) of the Act
(15 U.S.C. 78c).
(c) [ ] Insurance company as defined in section 3(a)(19) of the Act
(15 U.S.C. 78c).
(d) [ ] Investment company registered under section 8 of the
Investment Company Act of 1940 (15 U.S.C. 80a-8).
(e) [X] An investment adviser in accordance with 240.13d-1(b)(1)(ii)
(E).
(f) [ ] An employee benefit plan or endowment fund in accordance
with 240.13d-1(b)(1)(ii)(F).
(g) [ ] A parent holding company or control person in accordance
with 240.13d-1(b)(1)(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)
CUSIP No. 13G/A Page 5 of 6 Pages
667746101
ITEM 4. OWNERSHIP
(a) Amount Beneficially Owned:
422,550
(b) Percent of Class:
6.45%
(c) Number of Shares as to which such person has:
422,550
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
FRONTIER CAPITAL MANAGEMENT CO. INC. ("FRONTIER") IS AN INVESTMENT ADVISER
REGISTERED UNDER THE INVESTMENT ADVISERS ACT OF 1940. ITS PRINCIPAL BUSINESS
IS TO PROVIDE INVESTMENT ADVISORY SERVICES TO INSTITUTIONS AND INDIVIDUALS.
THE SHARES TO WHICH THIS STATEMENT RELATES ARE OWNED DIRECTLY BY VARIOUS
ACCOUNTS MANAGED BY FRONTIER. SUCH ACCOUNTS HAVE THE RIGHT TO RECEIVE
DIVIDENDS FROM, AND THE PROCEEDS FROM THE SALE OF, THE SHARES.
CUSIP No. 13G/A Page 6 of 6 Pages
667746101
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
ITEM 10. CERTIFICATION
By signing below I certify that, to the best of my knowledge and belief, the
securities referred to above 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.
DATED: By: /s/ J. Kirk Smith
--------------------------------
January 8, 2003 Name: J. KIRK SMITH
Title: EXECUTIVE VICE PRESIDENT