UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 6 )*
Gibraltar Steel Corporation
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
37476F103
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(CUSIP Number)
December 31, 2002
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(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).
Page 1 of 10 pages
CUSIP No. 37476F103 13G Page 2 of 10 pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Liberty Wanger Asset Management, L.P. 36-3820584
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
Not Applicable (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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5 SOLE VOTING POWER
NUMBER OF
None
SHARES ----------------------------------------------------------------
6 SHARED VOTING POWER
BENEFICIALLY
1,173,000
OWNED BY ----------------------------------------------------------------
7 SOLE DISPOSITIVE POWER
EACH
None
REPORTING ----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
PERSON WITH
1,173,000
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,173,000
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
Not Applicable [ ]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
7.3%
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12 TYPE OF REPORTING PERSON*
IA
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*SEE INSTRUCTION BEFORE FILLING OUT!
CUSIP No. 37476F103 13G Page 3 of 10 pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
WAM Acquisition GP, Inc.
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
Not Applicable (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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5 SOLE VOTING POWER
NUMBER OF
None
SHARES ----------------------------------------------------------------
6 SHARED VOTING POWER
BENEFICIALLY
1,173,000
OWNED BY ----------------------------------------------------------------
7 SOLE DISPOSITIVE POWER
EACH
None
REPORTING ----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
PERSON WITH
1,173,000
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,173,000
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
Not Applicable [ ]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
7.3%
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12 TYPE OF REPORTING PERSON*
CO
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*SEE INSTRUCTION BEFORE FILLING OUT!
CUSIP No. 37476F103 13G Page 4 of 10 pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Liberty Acorn Trust
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
Not Applicable (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Massachusetts
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5 SOLE VOTING POWER
NUMBER OF
None
SHARES ----------------------------------------------------------------
6 SHARED VOTING POWER
BENEFICIALLY
945,000
OWNED BY ----------------------------------------------------------------
7 SOLE DISPOSITIVE POWER
EACH
None
REPORTING ----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
PERSON WITH
945,000
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
945,000
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
Not Applicable [ ]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.9%
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12 TYPE OF REPORTING PERSON*
IV
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*SEE INSTRUCTION BEFORE FILLING OUT!
Item 1(a) Gibraltar Steel Corporation:
Item 1(b) Address of Issuer's Principal Executive Offices:
3556 Lake Shore Road
P.O. Box 2028
Buffalo, New York 14219-0228
Item 2(a) Name of Person Filing:
Liberty Wanger Asset Management, L.P. ("WAM")
WAM Acquisition GP, Inc., the general partner of WAM
("WAM GP")
Liberty Acorn Trust ("Acorn")
Item 2(b) Address of Principal Business Office:
WAM, WAM GP and Acorn are all located at:
227 West Monroe Street, Suite 3000
Chicago, Illinois 60606
Item 2(c) Citizenship:
WAM is a Delaware limited partnership; WAM GP is a
Delaware corporation; and Acorn is a Massachusetts
business trust.
Item 2(d) Title of Class of Securities:
Common Stock
Item 2(e) CUSIP Number:
37476F103
Item 3 Type of Person:
(d) Acorn is an Investment Company under section 8 of the
Investment Company Act.
(e) WAM is an Investment Adviser registered under section
203 of the Investment Advisers Act of 1940; WAM GP is
the General Partner of the Investment Adviser.
Page 5 of 10 pages
Item 4 Ownership (at December 31, 2002):
(a) Amount owned "beneficially" within the meaning
of rule 13d-3:
1,173,000
(b) Percent of class:
7.3% (based on 15,995,124 shares outstanding as
of September 30, 2002).
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote:
none
(ii) shared power to vote or to direct the vote:
1,173,000
(iii) sole power to dispose or to direct the
disposition of: none
(iv) shared power to dispose or to direct
disposition of: 1,173,000
Item 5 Ownership of Five Percent or Less of a Class:
Not Applicable
Item 6 Ownership of More than Five Percent on Behalf of Another Person:
The shares reported herein have been acquired on behalf
of discretionary clients of WAM, including Acorn.
Persons other than WAM and WAM GP are entitled to
receive all dividends from, and proceeds from the sale
of, those shares. Acorn is the only such person known to
be entitled to all dividends from, and all proceeds from
the sale of, shares reported herein to the extent of
more than 5% of the class.
Item 7 Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company:
Not Applicable
Item 8 Identification and Classification of Members of the Group:
Not Applicable
Item 9 Notice of Dissolution of Group:
Not Applicable
Page 6 of 10 pages
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.
Page 7 of 10 pages
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 10, 2003
The undersigned corporation, on the date above written, agrees
and consents to the joint filing on its behalf of this
Schedule 13G in connection with its beneficial ownership of
the security reported herein.
WAM Acquisition GP, Inc.
for itself and as general partner of
LIBERTY WANGER ASSET MANAGEMENT,
L.P.
By: /s/ Bruce H. Lauer
---------------------------------
Bruce H. Lauer
Senior Vice President and
Secretary
The undersigned corporation, on the date above written, agrees
and consents to the joint filing on its behalf of this
Schedule 13G in connection with its beneficial ownership of
the security reported herein.
LIBERTY ACORN TRUST
By: /s/ Bruce H. Lauer
---------------------------------
Bruce H. Lauer
Vice President, Treasurer
and Secretary
Page 8 of 10 pages
Exhibit Index
Exhibit 1 Joint Filing Agreement dated as of February 10, 2003 by and among
Liberty Wanger Asset Management, L.P., WAM Acquisition GP, Inc. and
Liberty Acorn Trust
Page 9 of 10 pages