Corporate Profile

With sales of $4.4 billion in 2005, WESCO, incorporated in 1993, is a leading North American provider of electrical construction products and electrical and industrial maintenance, repair and operating supplies, commonly referred to as “MRO.” We believe we are the largest distributor in terms of sales in the estimated $74 billion* U.S. electrical wholesale distribution industry based upon published industry sources and our assessment of peer company 2005 sales. We believe we are also the largest provider of integrated supply services for MRO goods and services in the United States.

Our distribution capability combined with integrated supply solutions and outsourcing services are designed to fulfill a customer’s MRO procurement needs. We have more than 370 full service branches and eight distribution centers located in the United States, Canada, Mexico, Puerto Rico, Guam, the United Kingdom, Nigeria, United Arab Emirates and Singapore. We serve approximately 100,000 customers worldwide, offering more than 1,000,000 products from more than 24,000 suppliers utilizing a highly automated, proprietary electronic procurement and inventory replenishment system. Our diverse customer base includes a wide variety of industrial companies; contractors for industrial, commercial and residential projects; utility companies; and commercial, institutional and governmental customers. Our top ten customers accounted for approximately 14% of our sales in 2005. Our leading market positions, experienced workforce, extensive geographic reach, broad product and service offerings and acquisition program have enabled us to grow our market position.

Corporate Headquarters
WESCO International, Inc.
Suite 700
225 West Station Square Drive
Pittsburgh, PA 15219-1122
Phone: 412-454-2200
www.wesco.com

Investor Relations
For questions regarding WESCO, contact Daniel A. Brailer, Treasurer and Director of Investor Relations, at dbrailer@wesco.com. A copy of the Company’s Annual Report on Form 10-K or other financial information may be requested through our web site (www.wesco.com) or by contacting Investor Relations.

Common Stock
WESCO International, Inc. is listed on the New York Stock Exchange under the ticker symbol WCC.

Annual Meeting
The Annual Meeting of stockholders will be held on May 17, 2006, at 2:00 p.m., CST, at:
Renaissance Toronto Airport Hotel
801 Dixon Road
Toronto, Ontario, Canada

Transfer Agent and Registrar
Mellon Investor Services, L.L.C.
Newport Office Center VII
480 Washington Blvd.
Jersey City, NJ 07310
www.melloninvestor.com/isd
Phone: 1-800-756-3353
Foreign holders: 1-201-680-6578
The hearing disabled can access TDD service at:
1-800-231-5469 (within the U.S.) or 1-201-680-6610.

        

Independent Registered Public Accounting Firm
PricewaterhouseCoopers LLP
Pittsburgh, PA

To ensure compliance with requirements imposed by the IRS, we inform you that any U.S. federal tax advice contained in this communication (including any attachments) is not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed within.

Certifications to the NYSE and the SEC
On November 2, 2005, the Company submitted its CEO Certification to the NYSE under NYSE Rule 303A.12(a).

Also, any CEO/CFO certifications required to be filed with the SEC, including the Section 302 certifications, are filed by the Company as exhibits to its Annual Report on Form 10-K.

  © 2006 WESCO International, Inc.