SECURITIES EXCHANGE COMMISSION
Washington, DC 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )
WESCO INTERNATIONAL INCORPORATED
(Name of Issuer)
Common Stock
(Title of Class of Securities)
95082P105
(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 2,704,458
[See Item 4 below.]
(7)Sole Disposi-
tive Power 0
(8)Shared Disposi-
tive Power 2,704,458
[See Item 4 below.]
9) Aggregate Amount Beneficially 2,704,458
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. 6.0%
12) Type of Reporting
Person (See Instructions) FI
1) Name of Reporting Person: Pioneer Investment Management, Inc. (PIM)
2) Check the Appropriate Box (a)
of A Member of Group
(See Instructions) (b)
3) SEC Use Only
4) Citizenship of Place of
Organization Delaware
Number of (5)Sole Voting
Shares Power 0
Beneficially Owned
by Each Reporting
Person With (6)Shared Voting
Power 2,576,491
[See Item 4 below.]
(7)Sole Disposi-
tive Power 0
(8)Shared Disposi-
tive Power 2,576,491
[See Item 4 below.]
9) Aggregate Amount Beneficially 2,576,491
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. 5.7%
12) Type of Reporting
Person (See Instructions) IA
Item 1(a) Name of Issuer.
WESCO INTERNATIONAL INCORPORATED
Item 1(b) Address of Issuer's Principal Executive Offices:
Commerce Court
4 Station Square
Suite 700
Pittsburgh, PA 15219
United States
Item 2(a) Name of Person Filing:
PGAM and PIM
Item 2(b) Address of Principal Business Office:
The principal business office for PGAM is:
Galleria San Carlo 6
Milan, Italy
The principal business office for PIM is:
60 State Street
Boston, MA 02109
Item 2(c) Citizenship:
PGAM is organized under the laws of Italy.
PIM is a corporation organized under the laws of the
State of Delaware.
Item 2(d) Title of Class of Securities:
Common Stock
Item 2(e) Cusip Number:
95082P105
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).
PIM is an investment adviser in accordance with Section
240.13d-1(b)(1)(ii)(E).
Item 4. Ownership.
(a) Amount Beneficially Owned:**
PGAM: 2,704,458
PIM: 2,576,491
(b) Percent of Class:
PGAM: 6.0%
PIM: 5.7%
(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:**
PGAM: 2,704,458
PIM: 2,576,491
(iii) sole power to dispose or to direct disposition of: 0
(iv) shared power to dispose or to direct disposition:**
PGAM: 2,704,458
PIM: 2,576,491
**Shares reported on this Schedule 13G (the Shares) are owned by (i) collective
investment vehicles (Funds) advised by PIM and (ii) Funds advised by other
advisors that are direct or indirect wholly-owned subsidiaries of PGAM
(Additional PGAM Subsidiaries). In their roles as investment manager or
adviser to the Funds, PIM and the Additional PGAM Subsidiaries possess
investment and/or voting control over the Shares.
PIM is a direct subsidiary of PGAM. PGAM is a limited liability company and the
holding company incorporating all of the Pioneer Investments asset management
business (including PIM, and the Additional PGAM Subsidiaries) and may
therefore, be deemed to beneficially own the Shares.
PGAM, PIM, and the Additional 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:
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
Various persons have the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the Common Stock of WESCO
INTERNATIONAL INCORPORATED. The interest of one person, PIM, in the common stock
of WESCO INTERNATIONAL INCORPORATED, amounted to 2,576,491 shares or 5.7% of the
total outstanding Common Stock at December 31, 2009.
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
Pioneer Investment Management, Inc.
By: /s/ Teri W. Anderholm
Name: Teri W. Anderholm
Title: Chief Compliance Officer
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 WESCO INTERNATIONAL INCORPORATED 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
Pioneer Investment Management, Inc.
By: /s/ Teri W. Anderholm
Name: Teri W. Anderholm
Title: Chief Compliance Officer