10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

(Mark One)

þ	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the fiscal year ended December 31, 2012

or

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period fromto

Commission file number 001-14989

WESCO International, Inc.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	25-1723342 (I.R.S. Employer Identification No.)
225 West Station Square Drive Suite 700 Pittsburgh, Pennsylvania (Address of principal executive offices)	15219 (Zip Code)

(412) 454-2200

(Registrant’s telephone number, including area code) 

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

Title of Class	Name of Exchange on which registered
Common Stock, par value $.01 per share	New York Stock Exchange

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for at least the past 90 days. Yes þ No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such file). Yes þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o No þ

The registrant estimates that the aggregate market value of the voting shares held by non-affiliates of the registrant was approximately $2,497.8 million as of June 30, 2012, the last business day of the registrant’s most recently completed second fiscal quarter, based on the closing price on the New York Stock Exchange for such stock.

As of February 26, 2013, 44,087,890 shares of Common Stock, par value $.01 per share, of the registrant were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

Part III of this Form 10-K incorporates by reference portions of the registrant’s Proxy Statement for its 2013 Annual Meeting of Stockholders.

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WESCO INTERNATIONAL, INC.

Annual Report on Form 10-K for the Fiscal Year Ended

December 31, 2012

TABLE OF CONTENTS

	Page
PART I
Item 1. Business	2
Item 1A. Risk Factors	9
Item 1B. Unresolved Staff Comments	13
Item 2. Properties	14
Item 3. Legal Proceedings	14
Item 4. Mine Safety Disclosures	14
PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	15
Item 6. Selected Financial Data	16
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
Item 7A. Quantitative and Qualitative Disclosures About Market Risks	27
Item 8. Financial Statements and Supplementary Data	29
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	65
Item 9A. Controls and Procedures	65
Item 9B. Other Information	66
PART III
Item 10. Directors, Executive Officers and Corporate Governance	67
Item 11. Executive Compensation	67
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	67
Item 13. Certain Relationships and Related Transactions, and Director Independence	67
Item 14. Principal Accountant Fees and Services	67
PART IV
Item 15. Exhibits and Financial Statement Schedules	68
Signatures	72
EX-10.23
EX-10.24
EX-21.1
EX-23.1
EX-31.1
EX-31.2
EX-32.1
EX-32.2
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

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PART I

Item 1. Business.

In this Annual Report onForm 10-K, “WESCO” refers to WESCO International, Inc., and its subsidiaries and its predecessors unless the context otherwise requires. References to “we,” “us,” “our” and the “Company” refer to WESCO and its subsidiaries.

The Company

WESCO International, Inc. (“WESCO International”), incorporated in 1993 and effectively formed in February 1994 upon acquiring a distribution business from Westinghouse Electric Corporation, is a leading North American based distributor of products and provider of advanced supply chain management and logistics services used primarily in industrial, construction, utility and commercial, institutional and government (“CIG”) markets. We are a leading provider of electrical, industrial, and communications maintenance, repair and operating (“MRO”) and original equipment manufacturers (“OEM”) products, construction materials, and advanced supply chain management and logistics services. Our primary product categories include general electrical and industrial supplies, wire, cable and conduit, data and broadband communications, power distribution equipment, lighting and lighting control systems, control and automation, motors, and safety.

We serve over 65,000 active customers globally through approximately 475 full service branches and nine distribution centers located in the United States, Canada, and Mexico with offices in 15 additional countries. At the end of 2012, we had approximately 9,000 employees worldwide. We distribute over 1,000,000 products, grouped into six categories, from more than 18,000 suppliers utilizing a highly automated, proprietary electronic procurement and inventory replenishment system.

In addition, we offer a comprehensive portfolio of value-added capabilities, which includes supply chain management, logistics and transportation, procurement, warehousing and inventory management, as well as kitting, limited assembly of products and system installation. Our value-added capabilities, extensive geographic reach, experienced workforce and broad product and supply chain solutions have enabled us to grow our business and establish a leading position in North America.

In December 2012, we completed the acquisition of EECOL Electric Corporation ("EECOL") with approximately $0.9 billion in annual sales, 57 locations across Canada and 20 in South America, and more than 20,000 customers.

Industry Overview

We operate in highly fragmented markets that include thousands of small regional and locally based, privately owned competitors. According to one industry publication, in 2011, the latest year for which market share data is available, the five largest North American electrical distributors, including WESCO, accounted for only approximately 30% of all industry sales in North America. Our global account, integrated supply and OEM programs provide customers with a regional, national, North American and global supply chain consolidation opportunities. The demand for these programs has grown in recent years, driven primarily by the desire of companies to reduce operating expenses by outsourcing operational and administrative functions associated with the procurement, management and utilization of MRO supplies and OEM components. We believe that significant opportunities exist for further expansion of these programs. The total potential in the United States for purchases of MRO and OEM supplies and services across all industrial distribution market segments and channels is currently estimated to be greater than $500 billion per an industry publication.

According to management estimates, electrical distribution industry sales have grown at an approximately 5% compound annual rate over the past 20 years. This expansion has been driven by general economic growth, increased price levels for key commodities, increased use of electrical products in businesses and industries, new products and technologies, the proliferation of enhanced building and safety codes, and use of the internet. Wholesale distributors have also grown as a result of a long-term shift in procurement preferences that favor the use of distributors over direct relationships with manufacturers. It is estimated that approximately 75% of electrical products manufactured in the United States are delivered to the end user through the distribution channel.

Markets and Customers

We have a large base of over 65,000 active customers across a diverse set of end markets. Our top ten customers accounted for approximately 10% of our sales in 2012. No one customer accounted for more than 3% of our sales in 2012.

The following table outlines our sales breakdown by end market:

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Year Ended December 31,	2012	2011	2010
(percentages based on total sales)
Industrial	44%	43%	42%
Construction	32%	35%	38%
Utility	12%	11%	13%
Commercial, Institutional and Governmental	12%	11%	7%

Industrial. Sales to industrial customers of MRO, OEM, and construction products and services accounted for approximately 44% of our sales in 2012, compared to 43% in 2011. Industrial sales product categories include a broad range of electrical equipment and supplies as well as lubricants, pipe, valves, fittings, fasteners, cutting tools, power transmission, and safety products. In addition, OEM customers require a reliable supply of assemblies and components to incorporate into their own products as well as value-added services such as supplier consolidation, design and technical support, just-in-time supply and electronic commerce, and supply chain management.

Construction. Sales of electrical and communications products to contractors accounted for approximately 32% of our sales in 2012, compared to 35% in 2011. Customers include a wide array of contractors and engineering, procurement and construction firms for industrial, infrastructure, commercial and data and broadband communications projects. Specific applications include projects for refineries, railways, hospitals, wastewater treatment facilities, data centers, security installations, offices, and modular and mobile homes. In addition to a wide array of electrical products, we offer contractors communications products for projects related to IT/network modernization, physical security upgrades, broadband deployments, network security, and disaster recovery.

Utility. Sales to utilities and utility contractors accounted for approximately 12% of our sales in 2012, compared to 11% in 2011. Customers include large investor-owned utilities, rural electric cooperatives, municipal power authorities and contractors that serve these customers. We provide our utility customers with products and services to support the construction and maintenance of their generation, transmission and distribution systems along with an extensive range of products that meet their power plant MRO and capital projects needs. Materials management and procurement outsourcing arrangements are also important in this market, as cost pressures and deregulation have caused utility customers to seek improvements in the efficiency and effectiveness of their supply chains.

Commercial, Institutional and Governmental ("CIG"). Sales to CIG customers accounted for approximately 12% of our sales in 2012 compared to 11% in 2011. Customers include schools, hospitals, property management firms, retailers and federal, state and local government agencies of all types, including federal contractors.

Business Strategy

Our goal is to grow organically at a rate greater than that of our industry while also making accretive acquisitions. Our organic growth strategy leverages our existing strengths and focuses on initiatives to enhance our sales and customer service, develop new end markets, broaden our product and service offerings and expand our geographic footprint. We utilize LEAN continuous improvement initiatives on a company-wide basis to deliver operational excellence and improve productivity. We also extend our LEAN initiatives to customers to improve the efficiency and effectiveness of their operations and supply chains. In addition, we seek to generate a distinct competitive advantage through talent management and employee development processes and programs.

We have identified certain growth engines that we believe provide substantial opportunities for above market growth. These growth engines include business models, selected end markets and product categories. The end markets are construction, government, international, and utility. The product categories are communications and security products, and lighting and sustainability. We believe our business models of global accounts and integrated supply programs also provide significant growth opportunities and are applicable to any of our served end markets. We have focused our growth efforts on these end markets, product categories, and business models as discussed below.

Grow Our Global Account Customer Relationships and Base. Our typical global account customer is a Fortune 1000 industrial or commercial company, a large utility, a major contractor, or a governmental or institutional customer, in each case with multiple locations. Our global account program is designed to provide customers with supply chain management services and cost reductions by coordinating and standardizing activity for MRO materials and OEM direct materials across their multiple locations utilizing our broad geographic footprint and our largely integrated information technology platform. Comprehensive implementation plans are managed at the local, national and international levels to prioritize activities, identify key performance measures, and track progress against objectives. We involve our preferred suppliers early in the implementation process, where they can contribute expertise and product knowledge to accelerate program implementation and achievement of cost savings and process improvements.

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Over the past ten years, growth from our global account programs has been a material component of our organic growth strategy. Our objective is to continue to increase revenue from our global account programs by expanding our product and service offerings to existing global account customers and expanding our reach to serve additional customer locations. We also plan on expanding our customer base by capitalizing on our industry expertise and supply chain optimization capabilities.

Extend Our Leadership Position in Integrated Supply Programs. Our integrated supply programs are focused on customers in the industrial, utility, construction and CIG markets. We combine our personnel, product and distribution expertise, electronic commerce technologies, and service capabilities with the customer's own internal resources to meet particular service requirements. Each integrated supply program is configured to reduce the number of suppliers, total procurement costs, and administrative expenses as well as improve operating controls. Our integrated supply programs focus on supply chain optimization and replace the traditional multi-vendor, resource-intensive procurement process with a single, outsourced, automated process. Our services range from timely product delivery to an outsourced procurement function. We believe that large customers will increasingly seek to utilize such services to consolidate and manage their MRO and OEM supply chains. We plan to expand our position as an integrated supply services leader in North America by building upon established relationships within our large customer base and premier supplier network, and extending our services to additional customers and locations around the world.

Expand Our Relationships with Construction Contractors. Our construction sales are focused on contractors, particularly those involved with healthcare, government facilities, enterprise data communications, telecommunication and energy and government infrastructure-related projects. We believe that significant cross selling opportunities exist for electrical and communications products and we intend to use our global account and integrated supply programs, LEAN initiatives and project management expertise to capitalize on construction business opportunities.

Expand Products and Services for Utilities. Our utility customers continue to focus on improving grid reliability as well as improving their operating efficiency and reducing costs.  As a result, we anticipate an increase in distribution grid improvement and transmission expansion projects as well as the adoption of integrated supply programs. Accordingly, we are focused on expanding our logistical and project services, integrated supply services and project management programs to increase our scope of supply on distribution grid, generation and other energy projects, including alternative energy projects.

Expand International Operations. We seek to capitalize on existing and emerging international market opportunities through local business development and the expansion of our global product and service platforms while taking advantage of acquisitions that expand our global footprint. We target large, growing markets where we can leverage our value proposition and relationships with key customers and suppliers. We believe this strategy of working with well-developed customer and supplier relationships significantly reduces risk and provides the opportunity to establish profitable business. Our priorities are focused on global vertical markets including energy, mining and metals, manufacturing, and infrastructure, as well as key product categories such as communications and security. Additionally, we are extending our procurement outsourcing and integrated supply programs following large, existing customers into international markets.

Grow Our Communications Products Position. Over the last several years, there has been a convergence of electrical and data communications contractors. Our ability to provide both electrical and communications products and services lines as well as automation, electromechanical, non-electrical MRO, physical security and utility products has presented cross selling opportunities across WESCO. Communications products have continued to be in demand due to networking upgrades, low voltage security investments, data center upgrades and increasing broadband and telecommunications utilization.

Grow Lighting System and Sustainability Sales. Lighting applications are undergoing significant innovation driven by energy efficiency and sustainability trends. We expanded our sales team and marketing initiatives and will continue to add resources in this product category and in product and service offerings to provide overall energy solutions. We opened our second Lighting & Sustainability Solutions Center to increase the customer's knowledge in lighting technology and solutions that contribute to an environmentally responsible future.

Pursue Strategic Acquisitions. In 2012, we acquired four businesses: RS Electronics ("RS"), Trydor Industries (Canada) Ltd. ("Trydor"), Conney Safety Products, LLC ("Conney"), and EECOL. We believe that the highly fragmented nature of the electrical and industrial distribution industry will continue to provide acquisition opportunities. We expect that any future acquisitions will be financed with internally generated funds, additional debt and/or the issuance of equity securities.

Drive Operational Excellence. LEAN continuous improvement is a set of company-wide strategic initiatives to increase efficiency and effectiveness across the entire business enterprise, including sales, operations and administrative processes. The basic principles behind LEAN are to systematically identify and implement improvements through simplification, elimination of waste and reduction in errors. We apply LEAN in our distribution environment, and develop and deploy numerous initiatives through the Kaizen approach targeting improvements in sales, margin, warehouse operations, transportation, purchasing, inventory, accounts receivable, accounts payable, and administrative processes. Our objective is to continue to implement LEAN initiatives across our business enterprise and to extend LEAN services to our customers and suppliers.

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Talent Management. Our strategy is to develop a distinct competitive advantage through talent management and employee engagement and development. We believe our ability to attract, develop and retain diverse human capital is imperative to ongoing business success. We improve workforce capability through various programs and processes that identify, recruit, develop and promote our talent base. Significant enhancements in these programs have been made over the last several years, and we expect to continue to refine and enhance these programs in the future.

Products and Services

Products

Our network of branches and distribution centers stock more than 250,000 unique product stock keeping units and we provide customers with access to more than 1,000,000 different products. Each branch tailors its inventory to meet the needs of its local customers.

Representative product categories and associated product lines that we offer include:

• General and Industrial Supplies. Wiring devices, fuses, terminals, connectors, boxes, enclosures, fittings, lugs, terminations, tape, splicing and marking equipment, tools and testers, safety and security, personal protection, abrasives, cutting tools, tapes, consumables, fasteners, janitorial and other MRO supplies;

• Wire, Cable and Conduit. Wire, cable, raceway, metallic and non-metallic conduit;

• Data and Broadband Communications. Structured cabling systems, broadband products, low voltage specialty systems, specialty wire and cable products, equipment racks and cabinets, access control, alarms, cameras, paging and voice solutions;

• Power Distribution Equipment. Circuit breakers, transformers, switchboards, panel boards, metering products and busway products;

• Lighting and Controls. Lamps, fixtures, ballasts and lighting control products; and

• Control, Automation and Motors. Motor control devices, drives, surge and power protection, relays, timers, pushbuttons, operator interfaces, switches, sensors, and interconnects.

The following table sets forth sales information about our sales by product category:

Year Ended December 31,	2012	2011	2010
(percentages based on total sales)
General and Industrial Supplies	36%	34%	35%
Wire, Cable and Conduit	17%	18%	18%
Data and Broadband Communications	15%	17%	15%
Power Distribution Equipment	13%	11%	12%
Lighting and Controls	9%	9%	10%
Control, Automation and Motors	10%	11%	10%

We purchase products from a diverse group of more than 18,000 suppliers. In 2012, our ten largest suppliers accounted for approximately 31% of our purchases. Our largest supplier accounted for approximately 12% of our total purchases. No other supplier accounted for more than 5% of our total purchases.

Our supplier relationships are important to us, providing access to a wide range of products, technical training, and sales and marketing support. We have over 300 preferred supplier arrangements and purchase over 60% of our products pursuant to these arrangements. Consistent with industry practice, most of our agreements with suppliers, including both distribution agreements and preferred supplier agreements, are terminable by either party on 60 days notice or less.

Services

As part of our overall offering, we provide customers a comprehensive portfolio of value added services which includes more than 50 value add solutions in 11 categories including construction, e-business, energy, engineering services, green and sustainability, production support, safety and security, supply chain optimization, training, and working capital. These solutions are designed to address our customer’s business needs through:

• Providing technical support for manufacturing process improvements;

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• Implementing inventory optimization programs, including just-in-time delivery and vendor managed inventory;

• Participating in joint cost savings teams;

• Assigning our employees as on-site support personnel;

• Consulting and recommending energy-efficient product upgrades; and

• Offering safety and product training for customer employees.

Competitive Strengths

We compete directly with global, national, regional and local distributors of electrical and other industrial supplies. Competition is primarily focused on the local service area, and is generally based on product line breadth, product availability, service capabilities and price. We also compete with buying groups formed by smaller distributors to increase purchasing power and provide some cooperative marketing capability. While increased buying power may improve the competitive position of buying groups locally, we believe it is difficult to coordinate a diverse ownership group to provide consistent quality products and services across multiple geographic regions. Although certain Internet-based procurement service companies, auction businesses and trade exchanges remain in the marketplace, the impact on our business from these competitors has not been significant to date.

Market Leadership. Our ability to manage complex global supply chains, multi-site facility maintenance programs and construction projects that require special sourcing, technical advice, logistical support and locally based service has enabled us to establish a strong presence in our served markets. We have utilized these skills to generate significant revenues in a broad range of industries with intensive use of electrical and industrial products.

Broad Product Offering and Value-added Services. We provide a wide range of products, services and procurement solutions, which draw on our product knowledge, supply and logistics expertise, system capabilities and supplier relationships to enable our customers to maximize productivity, minimize waste, improve efficiencies, reduce costs and enhance safety. Our broad product offering and stable source of supply enables us to consistently meet virtually all of a customer’s capital project, product, MRO and OEM requirements.

Extensive Distribution Network. We operate approximately 475 geographically dispersed branch locations and nine distribution centers (five in the United States and four in Canada). Our distribution centers add value for our customers, suppliers, and branches through the combination of a broad and deep selection of inventory, online ordering, next-day shipment and central order handling and fulfillment. Our distribution center network reduces the lead-time and cost of supply chain activities through automated replenishment and warehouse management systems and economies of scale in purchasing, inventory management, administration and transportation. This extensive network, which would be difficult and expensive to duplicate, provides us with a distinct competitive advantage and allows us to:

• Enhance localized customer service, technical support and sales coverage;

• Tailor individual branch products and services to local customer needs; and

• Offer multi-site distribution capabilities to large customers and global accounts.

Low Cost Operator. Our competitiveness has been enhanced by our consistent favorable operating cost position, which is based on use of LEAN, strategically-located distribution centers, and purchasing economies of scale. As a result of these factors and others, our operating cost as a percentage of sales is one of the lowest in our industry. Our selling, general and administrative expenses as a percentage of revenues for 2012 were 14.6%.

Geography

Our network of branches and distribution centers are located primarily in North America. We attribute revenues from external customers to individual countries on the basis of the point of sale. The following table sets forth information about us by geographic area:

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	Net Sales Year Ended December 31,												Long-Lived Assets December 31,
	2012				2011				2010				2012		2011		2010
(In thousands)
United States	$	5,215,849	79	%	$	4,994,641	82	%	$	4,198,420	83	%	$	144,947	$	131,988	$	117,768
Canada	1,084,109		17	%	900,551		15	%	682,415		13	%	100,366		24,609		12,446
Mexico	92,370		1	%	84,871		1	%	51,413		1	%	532		573		641
Subtotal North American Operations	6,392,328				5,980,063				4,932,248				245,845		157,170		130,855
Other Foreign	186,973		3	%	145,655		2	%	131,614		3	%	6,049		771		325
Total U.S. and Foreign	$	6,579,301			$	6,125,718			$	5,063,862			$	251,894	$	157,941	$	131,180

United States. To serve our customers in the United States, we operate a network of approximately 325 branches supported by five distribution centers located in Pennsylvania, Nevada, Mississippi, Wisconsin, and Arkansas. Sales in the United States represented approximately 79% of our total sales in 2012. According to the Electrical Wholesaling Magazine, the U.S. electrical wholesale distribution industry had estimated sales of approximately $91 billion in 2012.

Canada. To serve our Canadian customers, we operate a network of approximately 105 branches in nine provinces. Branch operations are supported by four distribution centers located in Edmonton, Montreal, Toronto, and Vancouver. Sales in Canada represented approximately 17% of our total sales in 2012. Total annual electrical industry sales in Canada are approximately $6.9 billion through December 31, 2012 according to a recent publication.

Mexico. We have 10 branch locations in Mexico. Our headquarters in Tlalnepantla Estado de Mexico operates similar to a distribution center to enhance the service capabilities of the local branches. Sales in Mexico represented approximately 1% of our total sales in 2012.

Other Foreign. We sell to global customers through export sales offices located in Miami, Houston, Pittsburgh, Montreal, and Calgary within North America and sales offices and branch operations in various international locations. Sales from other foreign locations represented approximately 3% of our total sales in 2012. Our branches in Aberdeen, Scotland and Manchester, England support sales efforts in Europe and the Middle East. We have a branch in Singapore to support our sales to Asia, a branch in Perth to serve customers in Australia, and a branch near Shanghai to serve customers in China along with operations in 10 additional countries. The EECOL acquisition expanded WESCO's footprint into South America. All of our international locations have been established to serve our growing list of customers with global operations.

Intellectual Property

We currently have trademarks, patents and service marks registered with the U.S. Patent and Trademark Office. The registered trademarks and service marks include: “WESCO ^® ”, our corporate logo and the running man logo. In addition, trademarks, patents, and service mark applications have been filed in various foreign jurisdictions, including Canada, Mexico, the United Kingdom, Singapore, China, Hong Kong, Thailand and the European Community.

Environmental Matters

Our facilities and operations are subject to federal, state and local laws and regulations relating to environmental protection and human health and safety. Some of these laws and regulations may impose strict, joint and several liabilities on certain persons for the cost of investigation or remediation of contaminated properties. These persons may include former, current or future owners or operators of properties and persons who arranged for the disposal of hazardous substances. Our owned and leased real property may give rise to such investigation, remediation and monitoring liabilities under environmental laws. In addition, anyone disposing of certain products we distribute, such as ballasts, fluorescent lighting and batteries, must comply with environmental laws that regulate certain materials in these products.

We believe that we are in compliance, in all material respects, with applicable environmental laws. As a result, we do not anticipate making significant capital expenditures for environmental control matters either in the current year or in the near future.

Seasonality

Our operating results are not significantly affected by seasonal factors. Sales during the first and fourth quarters are generally 1-3% below the sales of the second and third quarters, due to a reduced level of activity during the winter months of

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November through February. Sales typically increase beginning in March, with slight fluctuations per month through October. During periods of economic expansion or contraction our sales by quarter have varied significantly from this seasonal pattern.

Website Access

Our Internet address is www.wesco.com. Information contained on our website is not part of, and should not be construed as being incorporated by reference into, this Annual Report on Form 10-K. We make available free of charge under the “Investors” heading on our website our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as well as our Proxy Statements, as soon as reasonably practicable after such documents are electronically filed or furnished, as applicable, with the Securities and Exchange Commission (the “SEC”). You also may read and copy any materials we file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, DC 20549-0213. You may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an Internet site at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers like us who file electronically with the SEC.

In addition, our charters for our Executive Committee, Nominating and Governance Committee, Audit Committee and Compensation Committee, as well as our Independence Standards, our Governance Guidelines and our Code of Business Ethics and Conduct for our Directors, officers and employees, are all available on our website in the “Corporate Governance” link under the “Investors” heading.

Forward-Looking Information

This Annual Report on Form 10-K contains various “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These statements involve certain unknown risks and uncertainties, including, among others, those contained in Item 1, “Business,” Item 1A, “Risk Factors,” and Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” When used in this Annual Report on Form 10-K, the words “anticipates,” “plans,” “believes,” “estimates,” “intends,” “expects,” “projects,” “will” and similar expressions may identify forward-looking statements, although not all forward-looking statements contain such words. Such statements, including, but not limited to, our statements regarding business strategy, growth strategy, competitive strengths, productivity and profitability enhancement, competition, new product and service introductions and liquidity and capital resources are based on management’s beliefs, as well as on assumptions made by and information currently available to, management, and involve various risks and uncertainties, some of which are beyond our control. Our actual results could differ materially from those expressed in any forward-looking statement made by us or on our behalf. In light of these risks and uncertainties, there can be no assurance that the forward-looking information will in fact prove to be accurate. We have undertaken no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Executive Officers

Our executive officers and their respective ages and positions as of February 28, 2013, are set forth below.

Name	Age	Position
John J. Engel	51	Chairman, President and Chief Executive Officer
Stephen A. Van Oss	58	Senior Vice President and Chief Operating Officer
Daniel A. Brailer	55	Vice President, Investor Relations and Corporate Affairs
Allan A. Duganier	57	Director of Internal Audit
Timothy A. Hibbard	56	Vice President and Corporate Controller
Diane E. Lazzaris	46	Vice President, Legal Affairs
Kenneth S. Parks	49	Vice President and Chief Financial Officer
Kimberly G. Windrow	55	Vice President, Human Resources

Set forth below is biographical information for our executive officers listed above.

John J. Engel was appointed Chairman of the Board in May 2011 and has served as President and Chief Executive Officer since September 2009. Previously, Mr. Engel served as our Senior Vice President and Chief Operating Officer from 2004 to September 2009. From 2003 to 2004, Mr. Engel served as Senior Vice President and General Manager of Gateway, Inc. From 1999 to 2002, Mr. Engel served as an Executive Vice President and Senior Vice President of Perkin Elmer, Inc. From 1994 to 1999, Mr. Engel served as a Vice President and General Manager of Allied Signal, Inc. and held various engineering,

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manufacturing and general management positions at General Electric Company from 1985 to 1994. Mr. Engel is also a director of United States Steel Corporation, an integrated steel producer.

Stephen A. Van Oss has served as Senior Vice President and Chief Operating Officer since September 2009. From February 2012 to June 2012, he also served as the Company's Chief Financial Officer on an interim basis. Previously, Mr. Van Oss served as our Senior Vice President and Chief Financial and Administrative Officer from 2004 to September 2009. From 2000 to 2004, he served as our Vice President and Chief Financial Officer. From 1997 to 2000, Mr. Van Oss served as our Director, Information Technology and, in 1997, as our Director, Acquisition Management. From 1995 to 1996, Mr. Van Oss served as Chief Operating Officer and Chief Financial Officer of Paper Back Recycling of America, Inc. Mr. Van Oss serves as a director of Cooper-Standard Holdings Inc. and as the chairman of its audit committee. He also serves as a trustee of Robert Morris University and is chairman of its finance committee and is a member of its government committee.

Daniel A. Brailer has served as our Vice President, Investor Relations and Corporate Affairs since February 2012. From February 2011 to February 2012, he served as our Vice President, Treasurer, Investor Relations and Corporate Affairs. From 2006 to February 2011, he served as our Vice President, Treasurer and Investor Relations. From 1999 to 2006, he served as our Treasurer and Director of Investor Relations. Prior to joining the Company, Mr. Brailer served in various positions at Mellon Financial Corporation, most recently as Senior Vice President.

Allan A. Duganier has served as our Director of Internal Audit since 2006. From 2001 to 2006, Mr. Duganier served as our Corporate Operations Controller and, from 2000 to 2001, as our Industrial/Construction Group Controller.

Timothy A. Hibbard was appointed as our Vice President and Corporate Controller in February 2012. From 2006 to February 2012, he served as our Corporate Controller. From 2002 to 2006, he served as Corporate Controller at Kennametal Inc. From 2000 to 2002, Mr. Hibbard served as Director of Finance of Kennametal’s Advanced Materials Solutions Group, and, from 1998 to 2000, he served as Controller of Greenfield Industries, Inc., a subsidiary of Kennametal Inc.

Diane E. Lazzaris has served as our Vice President, Legal Affairs since February 2010. From February 2008 to February 2010, Ms. Lazzaris served as Senior Vice President - Legal, General Counsel and Corporate Secretary of Dick’s Sporting Goods, Inc. From 1994 to February 2008, she held various corporate counsel positions at Alcoa Inc., most recently as Group Counsel to a group of global businesses.

Kenneth S. Parkshas served as our Vice President and Chief Financial Officer since June 2012. From April 2008 to February 2012, he served as Vice President of Finance of United Technologies Corporation for their global Fire and Security business. From 2005 to April 2008, he served as Director of Investor Relations of United Technologies Corporation. He began his career in public accounting with Coopers & Lybrand.

Kimberly G. Windrow has served as our Vice President, Human Resources since August 2010. From 2004 until July 2010, Ms. Windrow served as Senior Vice President of Human Resources for The McGraw Hill Companies in the Education segment. From 2000 until 2004, she served as Senior Vice President of Human Resources for The MONY Group, and from 1988 until 1999, she served in various Human Resource positions at Willis, Inc.

Item 1A. Risk Factors.

The following factors, among others, could cause our actual results to differ materially from the forward-looking statements we make. All forward-looking statements attributable to us or persons working on our behalf are expressly qualified by the following factors. This information should be read in conjunction with Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, Item 7A, Quantitative and Qualitative Disclosures about Market Risks and the consolidated financial statements and related notes included in this Form 10-K.

Adverse conditions in the global economy and disruptions of financial markets could negatively impact our results of operations.

Our results of operations are affected by the level of business activity of our customers, which in turn is affected by global economic conditions and market factors impacting the industries and markets that they serve. Certain global economies and markets continue to experience significant uncertainty and volatility. Adverse economic conditions or lack of liquidity in various markets, particularly in North America, may adversely affect our revenues and operating results. Economic and financial market conditions also affect the availability of financing for projects and for our customers' capital or other expenditures, which can result in project delays or cancellations and thus affect demand for our products. There can be no assurance that any governmental responses to economic conditions or disruptions in the financial markets ultimately will stabilize the markets or increase our customers' liquidity or the availability of credit to our customers. Should one or more of our larger customers declare bankruptcy, it could adversely affect the collectability of our accounts receivable, bad debt reserves and net income. In addition, our ability to access the capital markets may be restricted at a time when we would like,

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or need, to do so. The global economic and financial environment also may affect our business and financial condition in ways that we currently cannot predict, and there can be no assurance that global economic and market conditions will not adversely affect our results of operations, cash flow or financial position in the future.

Downgrades of the U.S. sovereign credit rating could affect the strength of the U.S. dollar and since a majority of our sales are denominated in U.S. dollars, fluctuations of the U.S. dollar relative to other currencies could negatively affect our business, financial results and liquidity.

An increase in competition could decrease sales or earnings.

     We operate in a highly competitive industry and compete directly with global, national, regional and local providers of our products and services. Some of our existing competitors have, and new market entrants may have, greater resources than us. Competition is primarily focused in the local service area and is generally based on product line breadth, product availability, service capabilities and price. Other sources of competition are buying groups formed by smaller distributors to increase purchasing power and provide some cooperative marketing capability as well as e-commerce companies.

Existing or future competitors may seek to gain or retain market share by reducing prices, and we may be required to lower our prices or may lose business, which could adversely affect our financial results. Also, to the extent that we do not meet changing customer preferences or demands or to the extent that one or more of our competitors becomes more successful with private label products or otherwise, our ability to attract and retain customers could be materially adversely affected. Existing or future competitors also may seek to compete with us for acquisitions, which could have the effect of increasing the price and reducing the number of suitable acquisitions. In addition, it is possible that competitive pressures resulting from industry consolidation could affect our growth and profit margins.

Certain events or conditions could lead to interruptions in our operations, which may materially adversely affect our business, financial condition or results of operations.

    We operate a number of facilities and we coordinate company activities, including information technology systems and administrative services and the like, through our headquarters operations. Our operations depend on our ability to maintain existing systems and implement new technology, which includes allocating sufficient resources to periodically upgrade our information technology systems, and to protect our equipment and the information stored in our databases against both manmade and natural disasters, as well as power losses, computer and telecommunications failures, technological breakdowns, unauthorized intrusions, cyber attacks, and other events. Conversions to new information technology systems may result in cost overruns, delays or business interruptions. If our information technology systems are disrupted, become obsolete or do not adequately support our strategic, operational or compliance needs, it could result in competitive disadvantage and adversely affect our financial results and business operations, including our ability to process orders, receive and ship products, maintain inventories, collect accounts receivable and pay expenses.

Becausewe rely heavily on information technology both in serving our customers and in our enterprise infrastructure in order to achieve our objectives, we may be vulnerable to damage or intrusion from a variety of cyber-attacks including computer viruses, worms or other malicious software programs that access our systems. Despite the precautions we take to mitigate the risks of such events, an attack on our enterprise information technology system could result in theft or disclosure of our proprietary or confidential information or a breach of confidential customer or employee information. Such events could have an adverse impact on revenue, harm our reputation, and cause us to incur legal liability and costs, which could be significant, to address and remediate such events and related security concerns.

We also depend on accessible office facilities, distribution centers and information technology data centers for our operations to function properly. An interruption of operations at any of our distribution centers could have a material adverse effect on the operations of branches served by the affected distribution center. Such disaster related risks and effects are not predictable with certainty and, although they typically can be mitigated, they cannot be eliminated. We seek to mitigate our exposures to disaster events in a number of ways. For example, where feasible, we design the configuration of our facilities to reduce the consequences of disasters. We also maintain insurance for our facilities against casualties and we evaluate our risks and develop contingency plans for dealing with them. Although we have reviewed and analyzed a broad range of risks applicable to our business, the ones that actually affect us may not be those we have concluded most likely to occur. Furthermore, although our reviews have led to more systematic contingency planning, our plans are in varying stages of development and execution, such that they may not be adequate at the time of occurrence for the magnitude of any particular disaster event that befalls us.

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With the acquisition of EECOL Electric Corporation, our risk profile may differ materially from prior years as a result of increased levels of international operations, which could materially change our results of operations.

               On December 14, 2012 we completed our largest acquisition to date when we acquired EECOL Electric Corporation for approximately $1.1 billion.  EECOL is headquartered in Calgary, Alberta with 57 locations throughout Western Canada and 20 locations in South America.  While there are risks associated with acquisitions generally, including integration risks, there are additional risks more specifically associated with owning and operating businesses internationally, including those arising from import and export controls, exchange rate fluctuations, material developments in political, regulatory or economic conditions impacting those operations and various environmental and climatic conditions in particular areas of the world. With this acquisition, a greater percentage of our revenues and expenses will arise from international sources that may be subject to these risks from time to time. 

Expansion into new business activities, industries, product lines or geographic areas could subject the company to increased costs and risks and may not achieve the intended results.

Engaging in or significantly expanding business activities in product sourcing, sales and services could subject the company to unexpected costs and risks. Such activities could subject us to increased operating costs, product liability, regulatory requirements and reputational risks. Our expansion into new and existing markets, including manufacturing related or regulated businesses, may present competitive, distribution and regulatory challenges that differ from current ones. We may be less familiar with the target customers and may face different or additional risks, as well as increased or unexpected costs, compared to existing operations. Growth into new markets may also bring us into direct competition with companies with whom we have little or no past experience as competitors. To the extent we are reliant upon expansion into new geographic, industry and product markets for growth and do not meet the new challenges posed by such expansion, our future sales growth could be negatively impacted, our operating costs could increase, and our business operations and financial results could be negatively affected.

Loss of key suppliers, product cost fluctuations, lack of product availability or inefficient supply chain operations could decrease sales and earnings.

Most of our agreements with suppliers are terminable by either party on 60 days' notice or less. Our ten largest suppliers in

2012 accounted for approximately 31% of our purchases for the period. Our largest supplier in 2012 was Eaton Corporation accounting for approximately 12% of our purchases. The loss of, or a substantial decrease in the availability of, products from any of these suppliers, a supplier's change in sales strategy to rely less on distribution channels, or the loss of key preferred supplier agreements, could have a material adverse effect on our business. Supply interruptions could arise from shortages of raw materials, effects of economic or financial market conditions on a supplier's operations, labor disputes or weather conditions affecting products or shipments, transportation disruptions, or other reasons beyond our control. In addition, certain of our products, such as wire and conduit, are commodity-price-based products and may be subject to significant price fluctuations which are beyond our control. Furthermore, we cannot be certain that particular products or product lines will be available to us, or available in quantities sufficient to meet customer demand. Such limited product access could cause us to be at a competitive disadvantage. The profitability of our business is also dependent upon the efficiency of our supply chain. An inefficient or ineffective supply chain strategy or operations could increase operational costs, reduce profit margins and adversely affect our business.

Acquisitions that we may undertake would involve a number of inherent risks, any of which could cause us not to realize the benefits anticipated to result.

We have expanded our operations through organic growth and selected acquisitions of businesses and assets and may seek to do so in the future. Acquisitions involve various inherent risks, including: problems that could arise from the integration of the acquired business; uncertainties in assessing the value, strengths, weaknesses, contingent and other liabilities and potential profitability of acquisition candidates; the potential loss of key employees of an acquired business; the ability to achieve identified operating and financial synergies anticipated to result from an acquisition or other transaction; unanticipated changes in business, industry or general economic conditions that affect the assumptions underlying the acquisition or other transaction rationale; and expansion into new countries or geographic markets where we may be less familiar with operating requirements, target customers and regulatory compliance. Any one or more of these factors could increase our costs or cause us not to realize the benefits anticipated to result from the acquisition of business or assets.

We are subject to costs and risks associated with laws and regulations affecting our business.

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     The complex legal and regulatory environment exposes us to compliance costs and risks, as well as litigation and other legal proceedings, that could materially affect our operations and financial results. These laws and regulations may change, sometimes significantly, as a result of political or economic events. They include tax laws and regulations, import and export laws and regulations, government contracting laws and regulations, labor and employment laws and regulations, product safety, occupational safety and health laws and regulations, securities and exchange laws and regulations (and other laws applicable to publicly-traded companies such as the Foreign Corrupt Practices Act), and environmental laws and regulations. In addition, proposed laws and regulations in these and other areas, such as healthcare, employment, or legal matters could affect the cost of our business operations. From time to time we are involved in legal proceedings which may relate to, for example, product liability, labor and employment (including wage and hour), tax, import and export compliance, worker health and safety, general commercial and securities matters. While we believe that the outcome of any pending matter is unlikely to have a material adverse effect on our financial condition or liquidity, additional legal proceedings may arise in the future and the outcome of any legal proceedings and other contingencies could require us to take actions which could adversely affect our operations or could require us to pay substantial amounts of money.

Because we conduct business in many countries, we are subject to income taxes as well as non-income based taxes in both the United States and various foreign jurisdictions. As a result, we are required to interpret the income tax laws and rulings in each jurisdiction in which we operate and are subject to ongoing tax audits in various jurisdictions. Due to ambiguity of tax laws in certain of these jurisdictions and the subjective nature of factual determinations, the respective taxing authorities may disagree with certain positions we have taken and assess additional taxes. While we regularly evaluate the likely outcomes of these audits in order to determine the appropriateness of our tax provision, there can be no assurance that we will accurately predict the outcomes of these audits, and the actual outcomes could adversely affect our results of operations.

Our outstanding indebtedness requires debt service commitments that could adversely affect our ability to fulfill our obligations and could limit our growth and impose restrictions on our business.

     As of December 31, 2012, we had $1,918.8 million of consolidated indebtedness (excludes debt discount), including $850.0 million in aggregate principal amount of term loans due 2019 (the “Term Loans”) and $344.9 million in aggregate principal amount of 6.0% Convertible Senior Debentures due 2029 (the “2029 Debentures”). Our consolidated indebtedness also includes our mortgage facility, our revolving credit facility (the "Revolving Credit Facility"), which has an aggregate borrowing capacity of $600.0 million, and our accounts receivable securitization facility (the “Receivables Facility”), through which we sell up to $475.0 million of our accounts receivable to a third-party conduit. We and our subsidiaries may undertake additional borrowings in the future, subject to certain limitations contained in the instruments governing our indebtedness.

     Our debt service obligations have important consequences, including: our payments of principal and interest reduce the funds available to us for operations, future business opportunities and acquisitions and other purposes; they increase our vulnerability to adverse economic, financial market and industry conditions; our ability to obtain additional financing may be limited; they may hinder our ability to adjust rapidly to changing market conditions; we may be required to incur additional interest due to the contingent interest features of the 2029 Debentures, which are embedded derivatives; and our financial results are affected by increased interest costs. Our ability to make scheduled payments of principal and interest on our debt, refinance our indebtedness, make scheduled payments on our operating leases, fund planned capital expenditures or to finance acquisitions will depend on our future performance, which, to a certain extent, is subject to economic, financial, competitive and other factors beyond our control. There can be no assurance that our business will continue to generate sufficient cash flow from operations in the future to service our debt, make necessary capital expenditures or meet other cash needs. If unable to do so, we may be required to refinance all or a portion of our existing debt, to sell assets or to obtain additional financing. Our Receivables Facility is subject to renewal in August 2014, and our Revolving Credit Facility is subject to renewal in August 2016. There can be no assurance that available funding or any sale of additional receivables or additional financing will be possible at the times of renewal in amounts or terms favorable to us, if at all.

Over the next three years, we will be required to repay approximately $529.8 million of our currently outstanding indebtedness, of which $445.0 million is related to our Receivables Facility expiration, $30.1 million is related to our international lines of credit, $26.4 million is related to our mortgage credit facility (including a balloon payment of all outstanding amounts due in the first quarter of 2013), and $25.5 million is related to our Term Loans.

We must attract, retain and motivate key employees, and the failure to do so may adversely affect our business and results of operations.

     Our success depends on hiring, retaining and motivating key employees, including executive, managerial, sales, technical, marketing and support personnel. We may have difficulty locating and hiring qualified personnel. In addition, we may have difficulty retaining such personnel once hired, and key people may leave and compete against us. The loss of key personnel or

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our failure to attract and retain other qualified and experienced personnel could disrupt or adversely affect our business, its sales and results of operations. In addition, our operating results could be adversely affected by increased costs due to increased competition for employees, higher employee turnover, which may also result in loss of significant customer business, or increased employee benefit costs.

Our debt agreements contain restrictions that may limit our ability to operate our business.

     Our credit facilities also require us to maintain specific earnings to fixed expenses and to meet minimum net worth requirements in certain circumstances. Our Term Loan and credit facilities contain, and any of our future debt agreements may contain, certain covenant restrictions that limit our ability to operate our business, including restrictions on our ability to: incur additional debt or issue guarantees; create liens; make certain investments; enter into transactions with our affiliates; sell certain assets; make capital expenditures; redeem capital stock or make other restricted payments; declare or pay dividends or make other distributions to stockholders; and merge or consolidate with any person. Our Term Loan and credit facilities contain additional affirmative and negative covenants, and our ability to comply with these covenants is dependent on our future performance, which will be subject to many factors, some of which are beyond our control, including prevailing economic conditions.

As a result of these covenants, our ability to respond to changes in business and economic conditions and to obtain additional financing, if needed, may be significantly restricted, and we may be prevented from engaging in transactions that might otherwise be beneficial to us. In addition, our failure to comply with these covenants could result in a default under the 2029 Debentures, the credit facilities, the Term Loan, and our other debt, which could permit the holders to accelerate such debt. If any of our debt is accelerated, we may not have sufficient funds available to repay such debt.

Goodwill and indefinite life intangible assets recorded as a result of our acquisitions could become impaired.

     As of December 31, 2012, our combined goodwill and indefinite life intangible assets amounted to $1,882.9 million. To the extent we do not generate sufficient cash flows to recover the net amount of any investments in goodwill and other indefinite life intangible assets recorded, the investment could be considered impaired and subject to write-off. We expect to record further goodwill and other indefinite life intangible assets as a result of future acquisitions we may complete. Future amortization of such assets or impairments, if any, of goodwill or indefinite life intangible assets would adversely affect our results of operations in any given period.

There is a risk that the market value of our common stock may decline.

     Stock markets have experienced significant price and trading volume fluctuations, and the market prices of companies in our industry have been volatile. In recent years, volatility and disruption reached unprecedented levels. For some issuers, the markets have exerted downward pressure on stock prices and credit capacity. It is impossible to predict whether the price of our common stock will rise or fall. Trading prices of our common stock will be influenced by our operating results and prospects and by global economic, financial and other factors.

Future sales of our common stock in the public market or issuance of securities senior to our common stock could adversely affect the trading price of our common stock and the value of the 2029 Debentures.

     Future sales of substantial amounts of our common stock or equity-related securities in the public market, or the perception that such sales could occur, could adversely affect prevailing trading prices of our common stock and the value of the 2029 Debentures and could impair our ability to raise capital through future offerings of equity or equity-related securities. No prediction can be made as to the effect, if any, that future sales of shares of common stock or the availability of shares of common stock for future sale will have on the trading price of our common stock or the value of the 2029 Debentures.

There may be future dilution of our common stock.

     To the extent options to purchase common stock under our stock option plans are exercised, holders of our common stock will incur dilution. Additionally, our 2029 Debentures include contingent conversion price provisions and options for settlement in shares. Based on our current stock price, the 2029 Debentures may be converted into common stock which would increase dilution to our stockholders.

Item 1B. Unresolved Staff Comments.

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None.

Item 2. Properties.

We have approximately 475 branches, of which approximately 325 are located in the United States, approximately 105 are located in Canada and the remainder are in other locations including Chile, Mexico, the United Kingdom, Singapore, China, and Australia. Approximately 20% of our branches are owned facilities, and the remainder are leased.

The following table summarizes our distribution centers:

	Square Feet	Leased/Owned
Location
Warrendale, PA	194,000	Owned
Sparks, NV	131,000	Leased
Byhalia, MS	148,000	Owned
Little Rock, AR	100,000	Leased
Madison, WI	136,000	Leased
Dorval, QE	90,000	Leased
Burnaby, BC	65,000	Owned
Edmonton, AB	101,000	Leased
Mississauga, ON	246,000	Leased

We also lease our 69,000 square-foot headquarters in Pittsburgh, Pennsylvania. We do not regard the real property associated with any single branch location as material to our operations. We believe our facilities are in good operating condition and are adequate for their respective uses.

Item 3. Legal Proceedings.

From time to time, a number of lawsuits and claims have been or may be asserted against us relating to the conduct of our business, including routine litigation relating to commercial and employment matters. The outcome of any litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to us. However, management does not believe, based on information presently available, that the ultimate outcome of any such pending matters is likely to have a material adverse effect on our financial condition or liquidity, although the resolution in any quarter of one or more of these matters may have a material adverse effect on our results of operations for that period.

As initially reported in our 2008 Annual Report on Form 10-K, WESCO International, Inc. (the “Company”), through its wholly owned subsidiary, WESCO Distribution, Inc., is a defendant in a lawsuit filed in a state court in Indiana in which a customer, ArcelorMittal Indiana Harbor, Inc. (“AIH”), alleges that the Company sold defective products to AIH in 2004 that were supplied to the Company by others.  The lawsuit sought monetary damages in the amount of approximately $50 million.  On February 14, 2013, the jury returned a verdict in favor of AIH and awarded damages in the amount of approximately $36 million. Judgment was entered on the jury's verdict on February 14, 2013. The Company disputes this outcome and intends to appeal the judgment. The judgment amount may increase or decrease based on the outcome of various post-trial proceedings, which cannot be predicted with certainty. The Company has also submitted the claims to its insurance carriers.

Information relating to legal proceedings is included in Note 14, Commitments and Contingencies of the Notes to Consolidated Financial Statements and is incorporated herein by reference.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market, Stockholder and Dividend Information. Our common stock is listed on the New York Stock Exchange under the symbol “WCC.” As of February 26, 2013, there were 44,087,890 shares of common stock outstanding held by approximately 26 holders of record. We have not paid dividends on the common stock and do not presently plan to pay dividends in the foreseeable future. It is currently expected that earnings will be reinvested to support business growth, debt reduction or acquisitions. In addition, our Revolving Credit Facility and Term Loan Agreement restrict our ability to pay dividends. See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources.” The following table sets forth the high and low sales prices per share of our common stock, as reported on the New York Stock Exchange, for the periods indicated.

	Sales Prices
Quarter	High		Low
2011
First	$	63.09	$	52.14
Second	64.90		50.29
Third	57.34		33.51
Fourth	54.33		31.08
2012
First	$	67.34	$	52.67
Second	68.19		52.29
Third	64.17		51.76
Fourth	67.72		55.02

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Item 6. Selected Financial Data.

Selected financial data and significant events related to the Company’s financial results for the last five fiscal years are listed below. The financial data should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in Item 8 and with Management’s Discussion and Analysis of Financial Condition and Results of Operations, included in Item 7.

Year Ended December 31,	2012			2011			2010			2009			2008
(Dollars in millions, except per share data)
Income Statement Data:
Net sales	$	6,579.3		$	6,125.7		$	5,063.9		$	4,624.0		$	6,110.8
Cost of goods sold	5,247.8			4,889.2			4,065.4			3,724.1			4,904.2
Selling, general and administrative expenses	961.0			872.0			763.7			693.9			834.3
Depreciation and amortization	37.6			31.6			23.9			26.0			26.7
Income from operations	332.9			332.9			210.9			180.0			345.6
Interest expense, net	47.8			53.6			57.6			53.8			64.2
Loss on debt extinguishment / (gain) on debt exchange(1)	3.5			—			—			(6.0		)	—
Other (income)(2)	—			—			(4.3		)	(5.0		)	(9.4		)
Income before income taxes	281.6			279.3			157.6			137.2			290.8
Provision for income taxes	79.9			83.1			42.2			32.1			86.7
Net income	201.7			196.2			115.4			105.1			204.1
Less: Net loss attributable to noncontrolling interest(3)	0.1			0.1			—			—			—
Net income attributable to WESCO International, Inc.	$	201.8		$	196.3		$	115.4		$	105.1		$	204.1
Earnings per common share attributable to WESCO International, Inc.
Basic	$	4.62		$	4.54		$	2.72		$	2.49		$	4.82
Diluted	$	3.95		$	3.96		$	2.50		$	2.46		$	4.71
Weighted average common shares outstanding
Basic	43.7			43.2			42.5			42.3			42.4
Diluted	51.1			49.6			46.1			42.7			43.3
Other Financial Data:
Capital expenditures	$	23.1		$	33.3		$	15.1		$	13.0		$	35.3
Net cash provided by operating activities	288.2			167.5			127.3			291.7			279.9
Net cash (used) provided by investing activities	(1,311.0		)	(81.3		)	(220.5		)	(10.7		)	16.4
Net cash provided (used) by financing activities	1,044.0			(70.9		)	30.6			(264.9		)	(265.0		)
Balance Sheet Data:
Total assets	$	4,629.6		$	3,078.5		$	2,826.8		$	2,494.2		$	2,719.9
Total debt (including current and short-term debt)(4)	1,735.2			649.3			729.9			691.8			1,100.3
Stockholders’ equity(5)	1,553.7			1,345.9			1,148.6			996.3			755.1

⁽¹⁾  Represents the loss recognized in 2012 due to the redemption of all the outstanding 7.50% 2017 Senior Subordinated Notes due 2017 (the "2017 Notes") and the gain related to the 2009 convertible debt exchange. See Note 7 of the Notes to Consolidated Financial Statements.

⁽²⁾  In 2010, 2009 and 2008, represents income from the LADD joint venture. See Note 9 of the notes to consolidated financial statements.

⁽³⁾  Represents the portion of a net loss attributable to a consolidated entity not owned by the Company. See Note 5 of the Notes to Consolidated Financial Statements.

⁽⁴⁾  Includes the discount related to the 2029 Debentures, the 2.625% Convertible Senior Debentures due 2025 (the "2025 Debentures"), the 1.75% Convertible Senior Debentures due 2026 (the "2026 Debentures"), and the Term Loan facility. See Note 7 of the Notes to Consolidated Financial Statements.

⁽⁵⁾  Stockholders’ equity includes amounts related to the Debentures. See Note 7 of the Notes to Consolidated Financial Statements.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the audited consolidated financial statements and notes thereto included in Item 8 of this Annual Report onForm 10-K.

Company Overview

In 2012, we strengthened our organization and talent base, made improvements to our operations and capital structure, expanded our international presence, improved productivity, and completed four accretive acquisitions. Sales increased $453.6 million, or 7.4%, over the prior year. Acquisitions positively impacted consolidated sales by 3.3%, while foreign currency exchange negatively impacted sales by 0.3%, resulting in organic sales growth of 4.4%. Cost of goods sold as a percentage of net sales was 79.8% in both 2012 and 2011. Operating income of $332.9 million was comparable to prior year due to the $36 million 2012 fourth quarter charge related to the ArcelorMittal jury verdict. Net income increased 2.8% over the prior year to $201.8 million. Diluted earnings per share attributable to WESCO International, Inc. were $3.95 in 2012, compared with $3.96 in 2011.

Our end markets consist of industrial firms, electrical and data communications contractors, utilities, and commercial organizations, institutions and governmental entities. Our transaction types to these markets can be categorized as stock, direct ship and special order. Stock orders are filled directly from existing inventory and represent approximately 45% of total sales. Approximately 42% of our total sales are direct ship sales. Direct ship sales are typically custom-built products, large orders or products that are too bulky to be easily handled and, as a result, are shipped directly to the customer from the supplier. Special orders are for products that are not ordinarily stocked in inventory and are ordered based on a customer’s specific request. Special orders represent the remainder of total sales.

We have historically financed our working capital requirements, capital expenditures, acquisitions, share repurchases and new branch openings through internally generated cash flow, debt issuances, borrowings under our credit facilities and funding through our Receivables Facility.

Cash Flow

We generated $288.2 million in operating cash flow during 2012. Included in this amount were increased operating results partially offset by investments in working capital to fund our growth. Investing activities included aggregate payments of $1,289.5 million for the acquisitions of RS Electronics, Conney Safety, Trydor Industries, and EECOL Electric and $23.1 million for capital expenditures. Refer to Note 5 of our Notes to the Consolidated Financial Statements for additional information regarding the recent acquisitions. Financing activities during 2012 consisted of borrowings and repayments of $787.0 million and $605.7 million, respectively, related to our Revolving Credit Facility, borrowings and repayments of $672.1 million and $477.1 million, respectively, related to our Receivables Facility, borrowings of $840.7 related to our new Term Loans, and repayments of $150.1 related to early redemption of all the outstanding 2017 Notes.

Financing Availability

As of December 31, 2012, we had $299.0 million in total available borrowing capacity. The available borrowing capacity under our Revolving Credit Facility, which has a maturity date in August 2016, was $270.9 million, of which $89.7 million was the U.S. sub-facility borrowing limit and $181.2 million was the Canadian sub-facility borrowing limit. The available borrowing capacity under the Receivables Facility, which has a maturity date in August 2014, was $2.6 million. Our 2029 Debentures cannot be redeemed or repurchased until September 2016. For further discussion related to the Debentures, refer to Note 7 of our Notes to the Consolidated Financial Statements. We monitor the depository institutions that hold our cash and cash equivalents on a regular basis, and we believe that we have placed our deposits with creditworthy financial institutions. For further discussions refer to “Liquidity and Capital Resources.”

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates, including those related to supplier programs, bad debts, inventories, insurance costs, goodwill, income taxes, contingencies and litigation. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. If actual market conditions are less favorable than those projected by management, additional adjustments to reserve

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items may be required. We believe the following critical accounting policies affect our judgments and estimates used in the preparation of our consolidated financial statements.

Revenue Recognition

Revenues are recognized for product sales when title, ownership and risk of loss pass to the customer, or for services when the service is rendered. In the case of stock sales and special orders, a sale occurs at the time of shipment from our distribution point, as the terms of our sales are predominantly FOB shipping point. In cases where we process customer orders but ship directly from our suppliers, revenue is recognized once product is shipped and title has passed. In all cases, revenue is recognized once the sales price to our customer is fixed or is determinable and we have reasonable assurance as to the collectability.

In certain customer arrangements, we provide services such as inventory management. We may perform some or all of the following services for customers: determine inventory stocking levels; establish inventory reorder points; launch purchase orders; receive material; put away material; and pick material for order fulfillment. We recognize revenue for services rendered during the period based upon a previously negotiated fee arrangement. We also sell inventory to these customers and recognize revenue at the time title and risk of loss transfers to the customer.

Selling, General and Administrative Expenses

We include warehousing, purchasing, branch operations, information services, and marketing and selling expenses in this category, as well as other types of general and administrative costs.

Allowance for Doubtful Accounts

We maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. We have a systematic procedure using estimates based on historical data and reasonable assumptions of collectibles made at the local branch level and on a consolidated corporate basis to calculate the allowance for doubtful accounts.

Excess and Obsolete Inventory

We write down our inventory to its net realizable value based on internal factors derived from historical analysis of actual losses. We identify items at risk of becoming obsolete, which are defined as excess of 36 months supply relative to demand or movement. We then analyze the ultimate disposition of previously identified excess inventory items, such as sold, returned to supplier, or scrapped. This item by item analysis allows us to develop an estimate of the likelihood that an item identified as being in excess supply ultimately becomes obsolete. We apply the estimate to inventory items currently in excess of 36 months supply, and reduce our inventory carrying value by the derived amount. We revisit and test our assumptions on a periodic basis. Historically, we have not had material changes to our assumptions and do not anticipate any material changes in the future.

Supplier Volume Rebates

We receive rebates from certain suppliers based on contractual arrangements with them. Since there is a lag between actual purchases and the rebates received from the suppliers, we must estimate and accrue the approximate amount of rebates available at a specific date. We record the amounts as other accounts receivable on the balance sheet. The corresponding rebate income is recorded as a reduction of cost of goods sold. The appropriate level of such income is derived from the level of actual purchases made by us from suppliers. Supplier volume rebate rates have historically ranged between approximately 0.8% and 1.3% of sales depending on market conditions. In 2012, the rebate rate was 1.3%.

Goodwill and Indefinite Life Intangible Assets

We test goodwill and indefinite life intangible assets for impairment annually during the fourth quarter using information available at the end of September, or more frequently when events or circumstances occur indicating that their carrying value may not be recoverable. We test for goodwill impairment on a reporting unit level. The evaluation of impairment involves comparing the current fair value of goodwill and indefinite life intangible assets to the recorded value. We estimate the fair value of goodwill using a combination of discounted cash flow analyses and market multiples. Assumptions used for these fair value techniques are based on a combination of historical results, current forecasts, market data and recent economic events. We evaluate the recoverability of indefinite life intangible assets using a discounted cash flow analysis based on projected financial information. The determination of fair value involves significant management judgment and we apply our best judgment when assessing the reasonableness of financial projections. Two primary assumptions were a discount rate of 9.8% and a terminal growth rate of 5.0%.

A possible indicator of goodwill impairment is the relationship of a company’s market capitalization to its book value. As of December 31, 2012, our market capitalization exceeded our book value and there were no reporting units sensitive to impairment.

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The reported value of indefinite life trademarks totaled $105.1 million and $46.9 million at December 31, 2012 and 2011, respectively. Two trademarks totaling $18.1 million are most sensitive to a decline in financial performance. We are taking actions to improve our financial performance related to these businesses; however, we cannot predict whether or not there will be certain events that could adversely affect the reported value of these trademarks.

Intangible Assets

We account for certain economic benefits purchased as a result of our acquisitions, including customer relations, distribution agreements, technology and trademarks, as intangible assets. Most trademarks have an indefinite life. We amortize all other intangible assets over a useful life determined by the expected cash flows produced by such intangibles and their respective tax benefits. Useful lives vary between 4 and 20 years, depending on the specific intangible asset.

Insurance Programs

We use commercial insurance for auto, workers’ compensation, casualty and health claims as a risk sharing strategy to reduce our exposure to catastrophic losses. Our strategy involves large deductibles where we must pay all costs up to the deductible amount. We estimate our reserve based on historical incident rates and costs.

Income Taxes

We recognize deferred tax assets and liabilities for expected future tax consequences of events that have been included in our consolidated financial statements or tax returns. Deferred tax assets and liabilities are determined based on the difference between the financial reporting and the tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.

We record our deferred tax assets at amounts that are expected to be realized. We evaluate future taxable income and potential tax planning strategies in assessing the potential need for a valuation allowance. Should we determine that it is more likely than not that we would not be able to realize all or part of our deferred tax assets in the future, an adjustment to the deferred tax asset would be charged to income in the period such determination was made.

We account for uncertainty in income taxes using a recognition threshold and measurement attribute prescribed by income tax accounting guidance. We frequently review tax issues and positions taken on tax returns to determine the need and amount of contingency reserves necessary to cover any probable audit adjustments.

Convertible Debentures

We separately account for the liability and equity components of our convertible debentures in a manner that reflects our nonconvertible debt borrowing rate. We estimate our non-convertible debt borrowing rate through a combination of discussions with our financial institutions and review of relevant market data. The discounts to the convertible debenture balances are amortized to interest expense, using the effective interest method, over the implicit life of the debentures.

Stock-Based Compensation

Our stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units, and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. The performance-based awards are valued based upon a Monte Carlo simulation model. Expected volatilities are based on historical volatility of our common stock. We estimate the expected life of stock options and stock-settled stock appreciation rights using historical data pertaining to option exercises and employee terminations. The risk-free rate is based on the U.S. Treasury yields in effect at the time of grant. The forfeiture assumption is based on our historical employee behavior, which we review on an annual basis. Restricted stock units with vesting dependent upon service conditions are valued based on the market price on the grant date. No dividends are assumed for stock-based awards.

Results of Operations

The following table sets forth the percentage relationship to net sales of certain items in our consolidated statements of income for the periods presented.

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Year Ended December 31,	2012		2011		2010
Net sales	100.0	%	100.0	%	100.0	%
Cost of goods sold	79.8		79.8		80.3
Selling, general and administrative expenses	14.6		14.2		15.1
Depreciation and amortization	0.5		0.5		0.5
Income from operations	5.1		5.5		4.1
Interest expense	0.7		0.9		1.1
Loss on debt extinguishment	0.1		—		—
Other income	—		—		(0.1	)
Income before income taxes	4.3		4.6		3.1
Provision for income taxes	1.2		1.4		0.8
Net income attributable to WESCO International, Inc.	3.1	%	3.2	%	2.3	%

2012 Compared to 2011

Net Sales. Sales in 2012increased 7.4% to $6,579.3 million, compared with $6,125.7 million in 2011. Sales were positively impacted by execution of our growth initiatives and recent acquisitions. The increase in sales included a positive impact from acquisitions of 3.3% and a negative impact from foreign exchange of 0.3%. Additionally, management estimates the price impact on net sales was approximately 1.0%.

Cost of Goods Sold. Cost of goods sold increased 7.3% in 2012 to $5,247.9 million, compared with $4,889.1 million in 2011. Cost of goods sold as a percentage of net sales was 79.8% in both 2012 and 2011.

Selling, General and Administrative (“SG&A”) Expenses. SG&A expenses include costs associated with personnel, shipping and handling, travel, advertising, facilities, utilities and bad debts. SG&A expenses increased by $89.0 million, or 10.2%, to $961.0 million in 2012. The increase in SG&A expenses is primarily due to the $36 million 2012 fourth quarter charge related to the ArcelorMittal jury verdict. Additionally, SG&A expenses increased due to the impact from recent acquisitions of $29.7 million and compensation expenses related to the growth in sales. As a percentage of net sales, SG&A expenses increased to 14.6% of sales, compared with 14.2% in 2011.

SG&A payroll expenses for 2012 of $661.6 million increased by $52.7 million compared to 2011. The increase in SG&A payroll expense was primarily due to an increase in salary expense of $40.8 million and an increase in benefits of $15.5 million. These increases are primarily due to an increase in headcount, which is the result of both recent acquisitions and organic growth initiatives. Temporary labor costs and other SG&A payroll related costs each decreased $2.0 million.

The remaining SG&A expenses for 2012 of $263.3 million increased by $0.2 million compared to 2011.

Depreciation and Amortization. Depreciation and amortization increased $6.0 million to $37.6 million in 2012, compared with $31.6 million in 2011. The increase in depreciation and amortization was primarily due to the impact from recent acquisitions of $4.6 million.

Income from Operations. Income from operations decreased by $0.1 million to $332.9 million in 2012, compared to $333.0 million in 2011.

Interest Expense. Interest expense totaled $47.8 million in 2012, compared with $53.6 million in 2011, a decrease of 10.9%. Non-cash interest expense, which includes convertible debt interest, interest related to uncertain tax positions, and the amortization of deferred financing fees, for 2012 and 2011 was $1.5 million and $8.8 million, respectively.

Loss on Debt Extinguishment. In 2012, a loss on debt extinguishment of $3.5 million was incurred due to the redemption of the 2017 Notes.

Income Taxes. Our effective income tax rate decreased to 28.4% in 2012, compared with 29.8% in 2011, primarily as a result of the increase in taxable income outside the United States that is taxed at a lower rate.

Net Income. Net income increased by $5.5 million, or 2.8%, to $201.8 million in 2012, compared to $196.2 million in 2011.

Net Loss attributable to noncontrolling interest. Net loss attributable to noncontrolling interest totaled less than $0.1 million in 2012 and 2011.

Net Income attributable to WESCO International, Inc. Net income and diluted earnings per share attributable to WESCO International, Inc. on a consolidated basis totaled $201.8 million and $3.95 per share, respectively, in 2012, compared with $196.3 million and $3.96 per share, respectively, in 2011.

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2011 Compared to 2010

Net Sales. Sales in 2011 increased 21.0% to $6,125.7 million, compared with $5,063.9 million in 2010. Sales were positively impacted by our growth initiatives, improved conditions in our markets served, favorable foreign currency exchange rates positively impacting net sales by 0.8%, and acquisitions positively impacting net sales by 6.8%. Additionally, management estimates the price impact on net sales was approximately 3.0%.

Cost of Goods Sold. Cost of goods sold increased 20.3% in 2011 to $4,889.2 million, compared with $4,065.4 million in 2010. Cost of goods sold as a percentage of net sales was 79.8% in 2011 versus 80.3% in 2010. The decrease in the cost of goods sold percentage was primarily due to the margin impact from recent acquisitions and higher supplier volume rebate rates driven by the increase in sales.

Selling, General and Administrative Expenses. SG&A expenses include costs associated with personnel, shipping and handling, travel, advertising, facilities, utilities and bad debts. SG&A expenses increased by $108.4 million, or 14.2%, to $872.0 million in 2011. The increase in SG&A expenses is primarily due to compensation expenses related to the growth in sales and the impact from recent acquisitions of $44.6 million. As a percentage of net sales, SG&A expenses decreased to 14.2% of sales, compared with 15.1% in 2010. SG&A expenses increased at a lower rate than sales due to the continued effectiveness of our cost control initiatives and the fixed cost nature of certain SG&A expense components.

SG&A payroll expenses for 2011 of $608.9 million increased by $81.4 million compared to 2010. The increase in SG&A payroll expense was primarily due to an increase in salary expense of $43.9 million and an increase in commissions and incentives of $23.7 million. These increases are primarily due to an increase in headcount, which is the result of both recent acquisitions and organic growth initiatives.

The remaining SG&A expenses for 2011 of $263.1 million increased by $27.0 million compared to 2010 due to an increase in variable operating expenses associated with the growth in sales.

Depreciation and Amortization. Depreciation and amortization increased $7.7 million to $31.6 million in 2011, compared with $23.9 million in 2010. The increase in depreciation and amortization was primarily due to an increase in capital expenditures from $15.1 million in 2010 to $33.3 million in 2011.

Income from Operations. Income from operations increased by $122.1 million, or 57.9%, to $332.9 million in 2011, compared to $210.9 million in 2010.

Interest Expense. Interest expense totaled $53.6 million in 2011, compared with $57.6 million in 2010, a decrease of 6.9%. In 2010, interest expense was negatively impacted by $4.2 million resulting from the resolution of an outstanding tax matter.

Other Income. No other income was reported in 2011. In 2010, other income was comprised of equity income from the LADD joint venture totaling $4.3 million.

Income Taxes. Our effective income tax rate increased to 29.8% in 2011, compared with 26.7% in 2010, primarily as a result of the increase in taxable income in the United States.

Net Income. Net income increased by $80.8 million, or 69.9%, to $196.2 million in 2011, compared to $115.4 million in 2010.

Net Loss attributable to noncontrolling interest. Net loss attributable to noncontrolling interest totaled less than $0.1 million in 2011.

Net Income attributable to WESCO International, Inc. Net income and diluted earnings per share attributable to WESCO International, Inc. on a consolidated basis totaled $196.3 million and $3.96 per share, respectively, in 2011, compared with $115.4 million and $2.50 per share, respectively, in 2010.

Liquidity and Capital Resources

Total assets were $4.6 billion at December 31, 2012, compared to $3.1 billion at December 31, 2011. The $1.3 billion increase in total assets was principally attributable to the increase in goodwill of $769.7 million, intangible assets of $339.9 million, inventory of $167.0 million, and accounts receivable of $96.8 million. These increases are primarily attributable to recent acquisitions along with an increase in sales activity. Total liabilities at December 31, 2012 compared to December 31, 2011 increased by $1.3 billion to $3.1 billion. Contributing to the increase in total liabilities was the increase in long-term debt of $1,052.5 million and accounts payable of $63.8 million. These increases were associated with the recent and current year acquisitions and increased purchasing activity. Stockholders’ equity increased by 15.4% to $1.6 billion at December 31, 2012, compared with $1.3 billion at December 31, 2011, primarily as a result of net earnings of $201.8 million.

The following table sets forth our outstanding indebtedness:

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As of December 31,	2012			2011
(In thousands)
Term Loan Facility, less debt discount of $9,936	$	840,827		$	—
Mortgage financing facility	26,414			37,564
Accounts receivable securitization facility	445,000			250,000
Revolving credit facility	218,295			36,792
7.50% Senior Subordinated Notes due 2017	—			150,000
Foreign lines of credit	30,136			3,261
1.75% Convertible Senior Debentures due 2026, less debt discount of $0 in 2012 and 2011	—			56
6.0% Convertible Senior Debentures due 2029, less debt discount of $173,708 and $175,908 in 2012 and 2011, respectively	171,213			169,054
Capital leases	3,220			2,521
Other notes	67			85
Total debt	1,735,172			649,333
Less current and short-term portion	(39,759		)	(6,411		)
Total long-term debt	$	1,695,413		$	642,922

The required annual principal repayments for all indebtedness for the next five years and thereafter, as of December 31, 2012 is set forth in the following table:

(In thousands)
2013	$	66,173
2014	454,436
2015	9,192
2016	227,162
2017	8,691
Thereafter	1,153,162
Total payments on debt	1,918,816
Debt discount on convertible debentures and term loan facility	(183,644		)
Total long-term debt	$	1,735,172

Our liquidity needs generally arise from fluctuations in our working capital requirements, capital expenditures, acquisitions and debt service obligations. As of December 31, 2012, we had $270.9 million in available borrowing capacity under our Revolving Credit Facility, which combined with our $2.6 million of available borrowing capacity under our Receivables Facility and our invested cash of $25.5 million provided liquidity of $299.0 million. Invested cash included in our determination of liquidity represents cash deposited in interest bearing accounts. We believe cash provided by operations and financing activities will be adequate to cover our current operational and business needs.

We communicate on a regular basis with our lenders regarding our financial and working capital performance and liquidity position. We are in compliance with all covenants and restrictions contained in our debt agreements as of December 31, 2012.

At December 31, 2012, we had cash and cash equivalents totaling $86.1 million, of which $45.7 million was held by foreign subsidiaries. Included in cash held by foreign subsidiaries is approximately $31.5 million, which was obtained in connection with the acquisition of EECOL on December 14, 2012. This amount is expected to be returned to the sellers in May 2013, accordingly, a corresponding liability has been recorded at December 31, 2012. The cash held by some of our foreign subsidiaries could be subject to additional U.S. income taxes if repatriated. We believe that we are able to maintain a sufficient level of liquidity for our domestic operations and commitments without repatriation of the cash held by these foreign subsidiaries.

Over the next several quarters, we expect to maintain working capital productivity, and it is expected that excess cash will be directed primarily at debt reduction and acquisitions. Our near term focus will be managing our working capital as we

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experience sales growth and maintaining ample liquidity and credit availability. We anticipate capital expenditures in 2013 to be at levels similar to 2012. We believe our balance sheet and ability to generate ample cash flow provides us with a durable business model and should allow us to fund expansion needs and growth initiatives.

We finance our operating and investing needs as follows:

Term Loan Facility

On December 12, 2012, WESCO Distribution, as U.S. borrower, WDCC Enterprises, Inc. (WDCC and together with WESCO Distribution, the “Borrowers”), as Canadian borrower, and WESCO International entered into a Term Loan Agreement (the “Term Loan Agreement”) among WESCO Distribution, WDCC, the Company, the lenders party thereto and Credit Suisse AG Cayman Islands Branch, as administrative agent and as collateral agent.

The Term Loan Agreement provides for a seven-year term loan facility (the “Term Loan Facility”), which consists of two separate sub-facilities: (i) a Canadian sub-facility in an aggregate principal amount of CAD $150.0 million, issued at a 2.0% discount and (ii) a U.S. sub-facility in an aggregate principal amount of US $700.0 million, issued at a 1.0% discount. WESCO is amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $0.1 million was recorded for the year ended December 31, 2012. The debt discount amortization is expected to be $1.4 million annually.

Subject to the terms of the Term Loan Facility, the Borrowers may request incremental term loans thereunder from time to time in an aggregate principal amount not to exceed at any time US $300.0 million, with an equivalent principal amount in U.S. Dollars being calculated for any incremental term loan denominated in Canadian Dollars, in order to finance certain permitted acquisitions. The proceeds of the Term Loan Facility were used to finance the acquisition of EECOL, to pay fees and expenses incurred in connection with the acquisition and certain other transactions. At December 31, 2012, WESCO had a balance outstanding under the facility of US $850.8 million.

Borrowings under the Term Loan Facility bear interest at base rates plus applicable margins. At December 31, 2012, the interest rates on borrowings under the Canadian sub-facility and U.S. sub-facility were approximately 5.2% and 4.5%, respectively. The Borrowers will pay quarterly installments of principal equal to 0.25% of the original principal amount of their respective term loans, plus accrued and unpaid interest, beginning on March 31, 2013. To the extent not previously paid, the term loans will become due and payable on December 12, 2019, with any unpaid incremental term loans becoming due and payable on the respective maturity dates applicable to those incremental term loans. Other than in certain circumstances prior to the first anniversary of the closing of the Term Loan Facility, at any time or from time to time, the Borrowers may prepay borrowings under the Term Loan Facility in whole or in part without premium or penalty. The Borrowers' obligations under the Term Loan Facility are secured by substantially all of the assets of the Borrowers, the Company and certain of the Company's other subsidiaries; provided that, with respect to borrowings under the U.S. sub-facility, the collateral does not include assets of certain foreign subsidiaries or more than 65% of the issued and outstanding equity interests in certain foreign subsidiaries.

The Term Loan Facility contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Term Loan Parties with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. The Term Loan Facility also provides for customary events of default.

Mortgage Financing Facility

In 2003, WESCO finalized a mortgage financing facility of $51 million, of which $26.4 million was outstanding as of December 31, 2012. Total borrowings under the mortgage financing facility are subject to a 22-year amortization schedule, with a balloon payment due during the first quarter of 2013. The interest rate on borrowings under this facility is fixed at 6.5%. The Company's intent is to pay the 2013 obligations of $26.4 million utilizing the Revolving Credit Facility and therefore this facility is classified as long-term.

Accounts Receivable Securitization Facility

On December 11, 2012, WESCO Distribution entered into an amendment of the Receivables Facility pursuant to the terms and conditions of a Seventh Amendment to Third Amended and Restated Receivables Purchase Agreement, dated as of December 11, 2012 (the “Amendment”), by and among WESCO Receivables Corp. (“WESCO Receivables”), WESCO Distribution, the Purchasers and Purchaser Agents party thereto and PNC Bank, National Association, as Administrator. The Amendment, among other things, added certain defined terms and amended certain other terms such as change in control, excluded receivables, and an intercreditor agreement. Substantially all other terms and conditions of the Receivables Facility remain unchanged. In addition, on December 11, 2012, WESCO Distribution and WESCO Receivables exercised an existing accordion feature under the Receivables Facility to increase the purchasing limit thereunder from $450.0 million to $475.0 million. The Receivables Facility matures in August 2014.

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Under the Receivables Facility, we sell, on a continuous basis, an undivided interest in all domestic accounts receivable to WESCO Receivables, a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to third-party conduits and financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. WESCO has agreed to continue servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.

As of December 31, 2012 and 2011, accounts receivable eligible for securitization totaled approximately $601.1 million and $613.9 million, respectively. The consolidated balance sheets as of December 31, 2012 and 2011 include $445.0 million and $250.0 million, respectively, of account receivable balances legally sold to third parties, as well as borrowings for equal amounts. At December 31, 2012, the interest rate on borrowings under this facility was approximately 1.4%.

Revolving Credit Facility

On December 12, 2012, WESCO Distribution and certain other subsidiaries of the Company entered into a US $600.0 million revolving credit facility, which includes a letter of credit sub-facility of up to US $90.0 million in the aggregate, pursuant to the terms and conditions of an Amended and Restated Credit Agreement, dated as of December 12, 2012, among WESCO Distribution, the other U.S. Borrowers party thereto, WESCO Distribution Canada LP (“WESCO Canada”) and WDCC Enterprises, Inc. (“WDCC"), as Canadian Borrowers, the other Loan Parties party thereto, the Lenders party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and JPMorgan Chase Bank, N.A., Toronto Branch, as Canadian Administrative Agent. Upon completion of the acquisition of EECOL on December 14, 2012, EECOL was added as a Canadian Borrower. The Revolving Credit Facility contains an accordion feature allowing WESCO Distribution to request increases to the borrowing commitments under the Credit Facility of up to US $100.0 million in the aggregate. The Revolving Credit Facility replaced WESCO Distribution's US $400.0 million revolving credit facility originally entered into on August 22, 2011.

The Revolving Credit Facility matures in August 2016 and consists of two separate sub-facilities: (i) a Canadian sub-facility with a borrowing limit of up to US $400.0 million, which is collateralized by substantially all assets of WESCO Canada, WDCC and EECOL, and (ii) a U.S. sub-facility with a borrowing limit of up to US $600.0 million less the amount of outstanding borrowings under the Canadian sub-facility. The U.S. sub-facility is collateralized by substantially all assets of WESCO Distribution and its U.S. subsidiaries other than real property and accounts receivable sold or intended to be sold pursuant to the Receivables Facility. Availability under the Revolving Credit Facility is based upon the amount of eligible inventory and receivables applied against certain advance rates. The applicable interest rate for borrowings under the Revolving Credit Facility includes interest rate spreads based on available borrowing capacity that range between 1.50% and 2.00% for LIBOR-based borrowings and 0.50% and 1.00% for prime rate-based borrowings. The otherwise applicable interest rate is reduced by 0.25% if the Company's leverage ratio falls below a ratio of 2.5 to 1.0. At December 31, 2012, the interest rate on borrowings under this facility was approximately 2.5%.

The Credit Agreement contains customary affirmative and negative covenants for credit facilities of this type, including limitations on WESCO Distribution, the Company and certain of the Company's other subsidiaries with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. Subject to the terms of the Credit Agreement, the Company is permitted to pay dividends, repurchase common stock or repurchase indebtedness without limitation so long as pro forma combined availability under the Revolving Credit Facility and the Receivables Facility exceeds US $160.0 million and the adjusted fixed charge ratio is not less than a ratio of 1.1 to 1.0.

During 2012, WESCO borrowed $787.0 million in the aggregate under the Revolving Credit Facility and made repayments in the aggregate amount of $605.7 million. During 2011, aggregate borrowings and repayments were $435.7 million and $398.9 million, respectively. At December 31, 2012, WESCO had a balance outstanding of $218.3 million under the Revolving Credit facility. WESCO had $270.9 million available under the Revolving Credit facility at December 31, 2012, after giving effect to outstanding letters and foreign lines of credit, as compared to approximately $299.3 million at December 31, 2011.

7.50% Senior Subordinated Notes due 2017

On December 10, 2012, WESCO International announced that WESCO Distribution would redeem all of its outstanding 2017 Notes on January 9, 2013 (the “Redemption Date”) at a redemption price equal to 101.250% of the principal amount thereof plus accrued and unpaid interest to, but excluding, the Redemption Date, for a total of $1,030 per $1,000 principal amount of 2017 Notes. The aggregate principal amount of 2017 Notes outstanding was $150.0 million. On December 11, 2012, in accordance with the terms of the Indenture, dated as of September 27, 2005, among WESCO Distribution, WESCO International and The Bank of New York Mellon, as trustee (the “Trustee”), WESCO Distribution irrevocably deposited with the Trustee funds sufficient to pay principal and interest of all outstanding 2017 Notes on the Redemption Date. As a result, the Indenture was satisfied and discharged.

Foreign Lines of Credit

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Certain foreign subsidiaries of WESCO have entered into uncommitted lines of credit, which serve as overdraft facilities, to support local operations. The maximum borrowing limit varies by facility and ranges between US $0.5 million and US $8.0 million. The applicable interest rate for borrowings under these lines of credit varies by country and is governed by the applicable loan agreement. The foreign lines of credit are renewable on an annual basis and are fully and unconditionally guaranteed by WESCO Distribution. Accordingly, these lines directly reduce availability under the Revolving Credit Facility.

1.75% Convertible Senior Debentures due 2026

Proceeds of $300 million were received in connection with the issuance of the 2026 Debentures by WESCO International in November 2006. On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 2026 Debentures and 2025 Debentures, respectively (see the 6.0% Convertible Senior Debentures due 2029 discussion below for additional information). On November 30, 2011, WESCO International announced that it would redeem all of its 2026 Debentures on January 3, 2012. WESCO International redeemed the remaining $0.1 million aggregate principal amount of outstanding 2026 Debentures at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. Following the redemption on January 3, 2012, there were no 2026 Debentures outstanding.

On January 1, 2009, we retrospectively applied the provisions of guidance concerning convertible debt instruments to the 2026 Debentures. We utilized an interest rate of 6% to reflect the non-convertible market rate of our offering upon issuance. We amortized the debt discount over a five year period starting on the date of issuance. Non-cash interest expense of less than $0.1 million was recorded for the years ended December 31, 2011 and 2010.

6.0% Convertible Senior Debentures due 2029

On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 2026 Debentures and 2025 Debentures, respectively. As a result of the debt exchange, WESCO recorded a gain of $6.0 million, which included the write-off of debt issuance costs. The 2029 Debentures were issued pursuant to an Indenture dated August 27, 2009 (the “Indenture”), with The Bank of New York Mellon, as trustee, and are unconditionally guaranteed on an unsecured senior subordinate basis by WESCO Distribution.

We utilized an interest rate of 13.875% to reflect the non-convertible debt borrowing rate of our offering upon issuance, which was determined based on discussions with its financial institutions and a review of relevant market data, and resulted in a $181.2 million discount to the 2029 Debenture balance and a net increase in additional capital of $106.5 million. In addition, the financing costs related to the issuance of the 2029 Debentures were allocated between the debt and equity components. We are amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $2.2 million and $2.5 million was recorded for the years ended December 31, 2012 and 2011, respectively. The debt discount amortization will approximate $2.9 million in 2013, $3.3 million in 2014, $3.8 million in 2015, $4.3 million in 2016, and $4.9 million in 2017.

While the 2029 Debentures accrue interest at an effective interest rate of 13.875% (as described above), the coupon interest rate of 6.0% per annum is payable in cash semi-annually in arrears on each March 15 and September 15, and commenced March 15, 2010. Beginning with the six-month period commencing September 15, 2016, we will also pay contingent interest in cash during any six-month period in which the trading price of the 2029 Debentures for each of the five trading days ending on the second trading day immediately preceding the first day of the applicable six-month interest period equals or exceeds 120% of the principal amount of the 2029 Debentures. During any interest period when contingent interest shall be payable, the contingent interest payable per $1,000 principal amount of 2029 Debentures will equal 0.25% of the average trading price of $1,000 principal amount of the 2029 Debentures during the five trading days immediately preceding the first day of the applicable six-month interest period. In accordance with guidance related to derivatives and hedging, the contingent interest feature of the 2029 Debentures is an embedded derivative that is not considered clearly and closely related to the host contract. The contingent interest component had no significant value at December 31, 2012 or 2011.

The 2029 Debentures are convertible into cash, and in certain circumstances, shares of WESCO International's common stock, $0.01 par value, at any time on or after September 15, 2028, or prior to September 15, 2028 in certain circumstances. The 2029 Debentures will be convertible based on an initial conversion rate of 34.6433 shares of common stock per $1,000 principal amount of the 2029 Debentures (equivalent to an initial conversion price of approximately $28.87 per share). The conversion rate and conversion price may be adjusted under certain circumstances.

At any time on or after September 15, 2016, the Company may redeem all or a part of the 2029 Debentures plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the redemption date. If WESCO International undergoes certain fundamental changes, as defined in the Indenture, prior to maturity, holders of the

25

2029 Debentures will have the right, at their option, to require WESCO International to repurchase for cash some or all of their 2029 Debentures at a repurchase price equal to 100% of the principal amount of the 2029 Debentures being repurchased, plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the repurchase date.

The following table sets forth the components of WESCO's outstanding convertible debenture indebtedness:

	December 31, 2012							December 31, 2011
	Principal Balance		Discount			Net Carrying Amount		Principal Balance		Discount			Net Carrying Amount
(In thousands)
Convertible Debentures:
2026	$	—	$	—		$	—	$	56	$	—		$	56
2029	344,921		(173,708		)	171,213		344,962		(175,908		)	169,054
	$	344,921	$	(173,708	)	$	171,213	$	345,018	$	(175,908	)	$	169,110

Covenant Compliance

We were in compliance with all relevant covenants contained in our debt agreements as of December 31, 2012.

Cash Flow

An analysis of cash flows for 2012 and 2011 follows:

Operating Activities. Cash provided by operating activities for 2012 totaled $288.2 million, compared with $167.5 million of cash generated in 2011. Cash provided by operating activities included net income of $201.8 million and adjustments to net income totaling $61.6 million. Others sources of cash in 2012 were generated from a decrease in trade and other receivables of $36.4 million and a decrease in prepaid expenses and other current assets of $19.6 million. Primary uses of cash in 2012 included $29.3 million for the increase in inventory, $25.0 million for the decrease in other current and noncurrent liabilities, and $24.3 million for the decrease in payables. In 2011, primary sources of cash were net income of $196.2 million and adjustments to net income totaling $65.1 million. Other sources of cash in 2011 were generated from an increase in accounts payable of $101.7 million, an increase in accrued payroll and benefit costs of $10.0 million due to the increase in commissions, incentives, and benefit costs and a decrease in prepaid expenses and other current assets of $11.3 million. Primary uses of cash in 2011 included: $143.5 million for the increase in trade and other receivables, resulting from the increase in sales; $33.8 million for the increase in inventory; and $39.5 million for the decrease in other current and noncurrent liabilities.

Investing Activities. Net cash used by investing activities in 2012 was $1,311.0 million, compared with $81.3 million of net cash used in 2011. Included in 2012 were payments of $1,289.5 million for the acquisition of the businesses of EECOL, RS, Trydor, and Conney. During 2011, payments of $48.1 million were made for the acquisition of the businesses of RECO, LLC and Brews Supply, Ltd. Capital expenditures were $23.1 million and $33.3 million in 2012 and 2011, respectively.

Financing Activities. Net cash used by financing activities in 2012 was $1,044.0 million, compared with $70.9 million of net cash provided in 2011. During 2012, financing activities consisted of borrowings and repayments of $787.0 million and $605.7 million, respectively, related to our Revolving Credit Facility, borrowings and repayments of $672.1 million and $477.1 million, respectively, related to our Receivables Facility, borrowings of $840.8 related to our new Term Loan, and repayments of $150.0 related to early redemption of all the outstanding 2017 Notes. During 2011, borrowings and repayments of long-term debt of $435.7 million and $398.9 million, respectively, were made to our Revolving Credit Facility. Borrowings and repayments of $210.0 million and $330.0 million respectively, were applied to our Receivables Facility.

Contractual Cash Obligations and Other Commercial Commitments

The following summarizes our contractual obligations, including interest, at December 31, 2012 and the effect such obligations are expected to have on liquidity and cash flow in future periods.

26

	2013		2014 to 2015		2016 to 2017		2018 - After		Total
(In millions)
Contractual cash obligations (including interest):
Debt, excluding debt discount	$	66.2	$	463.6	$	235.9	$	1,153.1	$	1,918.8
Interest on indebtedness(1)	73.8		136.3		124.2		321.0		655.3
Non-cancelable operating leases	53.5		76.0		52.1		53.1		234.7
Total contractual cash obligations	$	193.5	$	675.9	$	412.2	$	1,527.2	$	2,808.8

⁽¹⁾  Interest on the variable rate debt was calculated using the rates and balances outstanding at December 31, 2012.

Purchase orders for inventory requirements and service contracts are not included in the table above. Generally, our purchase orders and contracts contain clauses allowing for cancellation. We do not have significant agreements to purchase material or goods that would specify minimum order quantities. Also, we do not consider obligations to taxing authorities to be contractual obligations requiring disclosure due to the uncertainty surrounding the ultimate settlement and timing of these obligations. As such, we have not included $30.0 million of such estimated liability in the table above.

Inflation

The rate of inflation, as measured by changes in the producer price index, affects different commodities, the cost of products purchased and ultimately the pricing of our different products and product classes to our customers. Our pricing related to inflation did not have a material impact on our sales revenue for the year ended December 31, 2012. Historically, price changes from suppliers have been consistent with inflation and have not had a material impact on the results of operations.

Seasonality

Our operating results are not significantly affected by seasonal factors. Sales during the first and fourth quarters are generally 1-3% below the sales of the second and third quarters, due to a reduced level of activity during the winter months of November through February. Sales typically increase beginning in March, with slight fluctuations per month through October. During periods of economic expansion or contraction our sales by quarter have varied significantly from this pattern.

Impact of Recently Issued Accounting Standards

See Note 2 of our Notes to the Consolidated Financial Statements for information regarding the effect of new accounting pronouncements.

Item 7A. Quantitative and Qualitative Disclosures about Market Risks.

Foreign Currency Risks

Approximately 79% of our sales are denominated in U.S. dollars and are primarily from customers in the United States. As a result, currency fluctuations are currently not material to our operating results. We do have foreign subsidiaries located in North America, South America, Europe, Africa, Asia and Australia and may establish additional foreign subsidiaries in the future. Accordingly, we may derive a larger portion of our sales from international operations, and a portion of these sales may be denominated in foreign currencies. As a result, our future operating results could become subject to fluctuations in the exchange rates of those currencies in relation to the U.S. dollar. Furthermore, to the extent that we engage in international sales denominated in U.S. dollars, an increase in the value of the U.S. dollar relative to foreign currencies could make our products less competitive in international markets. We have monitored and will continue to monitor our exposure to currency fluctuations.

Interest Rate Risk

Fixed Rate Borrowings: Approximately 19% of our debt portfolio is comprised of fixed rate debt. At various times, we have refinanced our debt to mitigate the impact of interest rate fluctuations. As the 2029 Debentures were issued at fixed rates, interest expense would not be impacted by interest rate fluctuations, although market value would be. The aggregate fair value of the 2029 Debentures was $853.7 million at December 31, 2012. Interest expense on our other fixed rate debt also would not be impacted by changes in market interest rates. For this fixed rate debt, fair value approximated carrying value at December 31, 2012 (see Note 7 to the Consolidated Financial Statements).

27

Floating Rate Borrowings: The majority of our variable rate borrowings at December 31, 2012 were comprised of the amounts outstanding under the Term Loan Facility, Revolving Credit Facility and the Receivables Facility. The fair value of these debt instruments at December 31, 2012 approximated carrying value, which totaled $1,514.1 million. We entered into the Term Loan Facility on December 12, 2012 and the proceeds were primarily used to finance the acquisition of EECOL. Borrowings under the Term Loan Facility bear interest at 1.0% or, if greater, the applicable LIBOR (London Interbank Offered Rate) / CDOR (Canadian Dealer Offered Rate) or base rates plus applicable margins and therefore are subject to fluctuations in interest rates. We borrow under our Revolving Credit Facility and Receivables Facility for general corporate purposes, including working capital requirements and capital expenditures. Borrowings under our Revolving Credit Facility bear interest at base rates plus applicable margins, whereas, borrowings under the Receivables Facility bear interest at the 30 day LIBOR or 30 day commercial paper rate plus applicable margins. A 100 basis point increase or decrease in interest rates would not have a significant impact on future earnings under our current capital structure.

28

Item 8. Financial Statements and Supplementary Data.

The information required by this item is set forth in our Consolidated Financial Statements contained in this Annual Report on Form 10-K. Specific financial statements can be found at the pages listed below:

WESCO International, Inc.

	PAGE
Report of Independent Registered Public Accounting Firm	30
Consolidated Balance Sheets as of December 31, 2012 and 2011	31
Consolidated Statements of Comprehensive Income for the years ended December 31, 2012, 2011 and 2010	32
Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2012, 2011 and 2010	33
Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010	34
Notes to Consolidated Financial Statements	35

29

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of WESCO International, Inc.,

In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of comprehensive income, stockholders’ equity and cash flows present fairly, in all material respects, the financial position of WESCO International, Inc. and its subsidiaries at December 31, 2012 and December 31, 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As described in Management's Report on Internal Control over Financial Reporting, management has excluded EECOL Electric Corporation (EECOL) and Conney Safety Products (Conney) from its assessment of internal control over financial reporting as of December 31, 2012 because they were acquired by the Company in a purchase business combination during 2012. We have also excluded EECOL and Conney from our audit of internal control over financial reporting. EECOL and Conney are wholly-owned subsidiaries whose total assets represent $1.4 billion and $144.8 million, respectively, and total revenues of $24.1 million and $39.0 million, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2012.

/s/ PricewaterhouseCoopers LLP

Pittsburgh, Pennsylvania

February 27, 2013

30

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
	2012			2011
	(Dollars in thousands, except share data)
Assets
Current Assets:
Cash and cash equivalents	$	86,099		$	63,869
Trade accounts receivable, net of allowance for doubtful accounts of $17,242 and $21,590 in 2012 and 2011, respectively	1,036,235			939,422
Other accounts receivable	89,801			43,442
Inventories, net	793,974			626,967
Current deferred income taxes (Note 10)	42,151			28,217
Income taxes receivable	8,849			12,206
Prepaid expenses and other current assets	44,728			23,297
Total current assets	2,101,837			1,737,420
Property, buildings and equipment, net (Note 6)	210,723			133,550
Intangible assets, net (Note 3)	496,761			156,874
Goodwill (Note 3)	1,777,797			1,008,127
Deferred income taxes (Note 10)	1,342			18,090
Other assets	41,169			24,391
Total assets	$	4,629,629		$	3,078,452
Liabilities and Stockholders’ Equity
Current Liabilities:
Accounts payable	$	706,580		$	642,777
Accrued payroll and benefit costs (Note 12)	86,375			76,915
Short-term debt (Note 7)	30,136			—
Current portion of long-term debt (Note 7)	9,623			6,411
Bank overdrafts	39,641			47,489
Current deferred income taxes (Note 10)	1,018			—
Other current liabilities	134,622			72,254
Total current liabilities	1,007,995			845,846
Long-term debt, net of discount of $183,644 and $175,908 in 2012 and 2011, respectively (Note 7)	1,695,413			642,922
Deferred income taxes (Note 10)	300,470			223,005
Other noncurrent liabilities (Note 12)	72,060			20,769
Total liabilities	$	3,075,938		$	1,732,542
Commitments and contingencies (Note 14)
Stockholders’ Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding (Note 8)	—			—
Common stock, $.01 par value; 210,000,000 shares authorized, 57,824,548 and 57,021,523 shares issued and 44,061,451 and 43,424,031 shares outstanding in 2012 and 2011, respectively (Note 8)	579			571
Class B nonvoting convertible common stock, $.01 par value; 20,000,000 shares authorized, 4,339,431 issued and no shares outstanding in 2012 and 2011, respectively	43			43
Additional capital (Note 8)	1,065,550			1,036,867
Retained earnings	1,092,719			891,789
Treasury stock, at cost; 18,102,528 and 17,936,923 shares in 2012 and 2011, respectively	(604,050		)	(593,329		)
Accumulated other comprehensive income	(1,044		)	10,057
Total WESCO International stockholders' equity	1,553,797			1,345,998
Noncontrolling interest	(106		)	(88		)
Total stockholders’ equity	1,553,691			1,345,910
Total liabilities and stockholders’ equity	$	4,629,629		$	3,078,452

The accompanying notes are an integral part of the consolidated financial statements.

31

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Year Ended December 31,
	2012			2011			2010
	(In thousands, except per share data)
Net sales	$	6,579,301		$	6,125,718		$	5,063,862
Cost of goods sold (excluding depreciation and amortization below)	5,247,855			4,889,149			4,065,425
Selling, general and administrative expenses	961,014			871,983			763,583
Depreciation and amortization	37,561			31,607			23,935
Income from operations	332,871			332,979			210,919
Interest expense, net	47,762			53,603			57,563
Loss on debt extinguishment (Note 7)	3,470			—			—
Other income (Note 9)	—			—			(4,285		)
Income before income taxes	281,639			279,376			157,641
Provision for income taxes (Note 10)	79,880			83,136			42,164
Net income	201,759			196,240			115,477
Less: Net loss attributable to noncontrolling interest	(18		)	(11		)	—
Net income attributable to WESCO International, Inc.	$	201,777		$	196,251		$	115,477
Comprehensive Income:
Foreign currency translation adjustment	(9,013		)	(12,576		)	11,648
Comprehensive income attributable to WESCO International, Inc.	$	192,764		$	183,675		$	127,125
Earnings per share attributable to WESCO International, Inc. (Note 11)
Basic	$	4.62		$	4.54		$	2.72
Diluted	$	3.95		$	3.96		$	2.50

The accompanying notes are an integral part of the consolidated financial statements.

32

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

																							Accumulated Other
						Class B						Retained											Comprehensive
	Common Stock					Common Stock			Additional			Earnings			Treasury Stock					Noncontrolling			Income
(Dollars in thousands)	Amount			Shares		Amount		Shares	Capital			(Deficit)			Amount			Shares		Interest			(Loss)
Balance, December 31, 2009	$	560		55,967,824		$	43	4,339,431	$	992,855		$	582,199		$	(590,353	)	(17,890,459	)	$	—		$	10,985
Exercise of stock options, including tax benefit of $3,082	3			268,213					4,852						(654		)	(15,281	)
Stock-based compensation expense									15,751
Conversion of 2025 debentures	3			340,213					5,225
Net income												115,477
Translation adjustment																							11,648
Balance, December 31, 2010	566			56,576,250		43		4,339,431	1,018,683			697,676			(591,007		)	(17,905,740	)	—			22,633
Exercise of stock options, including tax benefit of $5,365, and vesting of restricted stock units, net of taxes	6			531,121					5,783						(7,838		)	(146,614	)
Stock-based compensation expense									15,407
Conversion of 2029 debentures				589					(5		)
Issuance of treasury stock									(582		)				957			28,994
Tax liability related to exercise of restricted stock units and retirement of common stock	(1		)	(86,437	)				(2,419		)	(2,138		)	4,559			86,437
Noncontrolling interest																				(77		)
Net income												196,251								(11		)
Translation adjustment																							(12,576		)
Balance, December 31, 2011	571			57,021,523		43		4,339,431	1,036,867			891,789			(593,329		)	(17,936,923	)	(88		)	10,057
Exercise of stock options, including tax benefit of $11,139	8			829,401					14,310						(12,277		)	(192,669	)
Stock-based compensation expense									15,088
Conversion of 2029 debentures				688					(5		)
Tax liability related to exercise of restricted stock units and retirement of common stock				(27,064	)				(710		)	(847		)	1,556			27,064
Noncontrolling interest																				(18		)
Net income (loss)												201,777
Translation adjustment																							(11,101		)
Balance, December 31, 2012	$	579		57,824,548		$	43	4,339,431	$	1,065,550		$	1,092,719		$	(604,050	)	(18,102,528	)	$	(106	)	$	(1,044	)

The accompanying notes are an integral part of the consolidated financial statements.

33

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year Ended December 31,
	2012			2011			2010
	(In thousands)
Operating Activities:
Net income	$	201,759		$	196,240		$	115,477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,561			31,607			23,935
Stock-based compensation expense	15,088			15,407			15,752
Amortization of debt issuance costs	2,655			4,435			2,584
Amortization of debt discount	2,260			2,499			4,262
Loss on debt extinguishment	1,595			—			—
(Gain) loss on sale of property, buildings and equipment	(546		)	304			(224		)
Asset impairment charge	—			—			3,793
Equity income, net of distributions in 2010 of $1,864	—			—			(2,420		)
Excess tax benefit from stock-based compensation	(11,358		)	(5,408		)	(3,217		)
Interest related to uncertain tax positions	(3,371		)	1,901			4,980
Deferred income taxes	17,685			14,373			20,982
Changes in assets and liabilities
Trade and other receivables, net	36,415			(143,491		)	(118,478		)
Inventories, net	(29,339		)	(33,769		)	(33,956		)
Prepaid expenses and other current assets	19,588			11,268			12,641
Accounts payable	(24,346		)	101,677			53,902
Accrued payroll and benefit costs	(2,498		)	9,988			34,422
Other current and noncurrent liabilities	25,036			(39,498		)	(7,152		)
Net cash provided by operating activities	288,184			167,533			127,283
Investing Activities:
Capital expenditures	(23,084		)	(33,347		)	(15,132		)
Acquisition payments, net of cash acquired	(1,289,480		)	(48,093		)	(265,397		)
Proceeds from sale of subsidiary	—			—			40,000
Equity distribution	—			—			4,054
Collection of note receivable	—			—			15,000
Proceeds from sale of assets	1,558			97			932
Net cash used in investing activities	(1,311,006		)	(81,343		)	(220,543		)
Financing Activities:
Proceeds from issuance of short-term debt	24,569			—			—
Repayments of short-term debt	(9,969		)	—			—
Proceeds from issuance of long-term debt	2,299,797			648,557			1,454,479
Repayments of long-term debt	(1,244,030		)	(730,897		)	(1,419,526		)
Debt issuance costs	(17,757		)	(4,703		)	(2,553		)
Proceeds from the exercise of stock options	3,174			419			1,771
Excess tax benefit from stock-based compensation	11,358			5,408			3,217
Repurchase of common stock	(12,280		)	(7,840		)	(655		)
(Decrease) increase in bank overdrafts	(8,283		)	19,899			(4,601		)
Payments on capital lease obligations	(2,531		)	(1,751		)	(1,497		)
Net cash provided (used) by financing activities	1,044,048			(70,908		)	30,635
Effect of exchange rate changes on cash and cash equivalents	1,004			(4,990		)	3,873
Net change in cash and cash equivalents	22,230			10,292			(58,752		)
Cash and cash equivalents at the beginning of period	63,869			53,577			112,329
Cash and cash equivalents at the end of period	$	86,099		$	63,869		$	53,577
Supplemental disclosures:
Cash paid for interest	$	43,713		$	43,446		$	46,899
Cash paid for taxes	51,733			79,189			11,044
Non-cash investing and financing activities:
Property, buildings and equipment acquired through capital leases	3,216			1,112			301

The accompanying notes are an integral part of the consolidated financial statements.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. ORGANIZATION

WESCO International, Inc. ("WESCO International") and its subsidiaries (collectively, “WESCO”), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating (“MRO”) and original equipment manufactures (“OEM”) products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. We serve over 65,000 active customers globally, through approximately 475 full service branches and nine distribution centers located primarily in the United States, Canada and Mexico, with operations in 15 additional countries.

2. ACCOUNTING POLICIES

Basis of Consolidation

The consolidated financial statements include the accounts of WESCO International and all of its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions WESCO may undertake in the future, actual results may ultimately differ from the estimates.

Revenue Recognition

Revenues are recognized for product sales when title, ownership and risk of loss pass to the customer or for services when the service is rendered. In the case of stock sales and special orders, a sale occurs at the time of shipment from WESCO's distribution point, as the terms of WESCO’s sales are predominantly FOB shipping point. In cases where WESCO processes customer orders but ships directly from its suppliers, revenue is recognized once product is shipped and title has passed. In all cases, revenue is recognized once the sales price to the customer is fixed or is determinable and WESCO has reasonable assurance as to the collectability.

In certain customer arrangements, WESCO provides services such as inventory management. WESCO may perform some or all of the following services for customers: determine inventory stocking levels; establish inventory reorder points; launch purchase orders; receive material; put away material; and pick material for order fulfillment. WESCO recognizes revenue for services rendered during the period based upon a previously negotiated fee arrangement. WESCO also sells inventory to these customers and recognizes revenue at the time title and risk of loss transfers to the customer. The amount of revenue attributed to these services totaled $17.6 million, $10.8 million, and $11.1 million in 2012, 2011 and 2010, respectively.

Selling, General and Administrative Expenses

WESCO includes warehousing, purchasing, branch operations, information services, and marketing and selling expenses in this category, as well as other types of general and administrative costs.

Supplier Volume Rebates

WESCO receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable on the balance sheet, and represent the estimated amounts due to WESCO under the rebate provisions of the various supplier contracts. The corresponding rebate income is recorded as a reduction of cost of goods sold. The appropriate level of such income is derived from the level of actual purchases made by WESCO from suppliers. Receivables under the supplier rebate program were $68.7 million at December 31, 2012 and $38.5 million at December 31, 2011. Supplier volume rebate rates have historically ranged between approximately 0.8% and 1.3% of sales depending on market conditions. In 2012, the rebate rate was 1.3%.

Shipping and Handling Costs and Fees

WESCO records the costs and fees associated with transporting its products to customers as a component of selling, general and administrative expenses. These costs totaled $49.9 million, $50.9 million and $42.4 million in 2012, 2011 and 2010, respectively.

Cash Equivalents

Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased.

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Asset Securitization

WESCO maintains control of the receivables transferred pursuant to its accounts receivable securitization program (the “Receivables Facility”); therefore the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and WESCO recognizes the related secured borrowing. The expenses associated with the Receivables Facility are reported as interest expense in the statement of income.

Allowance for Doubtful Accounts

WESCO maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. WESCO has a systematic procedure using estimates based on historical data and reasonable assumptions of collectability made at the local branch level and on a consolidated corporate basis to calculate the allowance for doubtful accounts. If the financial condition of WESCO’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The allowance for doubtful accounts was $17.2 million at December 31, 2012 and $21.6 million at December 31, 2011. The total amount recorded as selling, general and administrative expense related to bad debts was $1.1 million, $6.6 million and $6.4 million for 2012, 2011 and 2010, respectively.

Inventories

Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or market. Cost is determined principally under the average cost method. WESCO makes provisions for obsolete or slow-moving inventories as necessary to reflect reduction in inventory value. WESCO writes down its inventory to its net realizable value based on internal factors derived from historical analysis of actual losses. Looking back, WESCO identifies items at risk of becoming obsolete, which are defined as excess of 36 months supply relative to demand or movement. WESCO then analyzes the ultimate disposition of previously identified excess inventory items, such as sold, returned to supplier, or scrapped. This item by item analysis allows WESCO to develop an estimate of the historical likelihood that an item identified as being in excess supply ultimately becomes obsolete. WESCO applies the estimate to inventory items currently in excess of 36 months supply, and reduces its inventory carrying value by the derived amount. Reserves for excess and obsolete inventories were $16.7 million and $14.6 million at December 31, 2012 and 2011, respectively. The total expense related to excess and obsolete inventories, included in cost of goods sold, was $11.4 million, $5.5 million and $7.5 million for 2012, 2011 and 2010, respectively. WESCO absorbs into the cost of inventory the general and administrative expenses related to inventory such as purchasing, receiving and storage and at December 31, 2012 and 2011, $62.2 million and $47.6 million, respectively, of these costs were included in ending inventory.

Other Assets

WESCO amortizes deferred financing fees over the term of the various debt instruments. Deferred financing fees in the amount of $17.8 million were incurred during the year ending December 31, 2012. As of December 31, 2012 and 2011, the amount of other assets related to unamortized deferred financing fees was $26.4 million and $12.9 million, respectively.

Property, Buildings and Equipment

Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives range from five to forty years for leasehold improvements and buildings and three to ten years for furniture, fixtures and equipment.

Capitalized computer software costs are amortized using the straight-line method over the estimated useful life, typically three to five years, and are reported at the lower of unamortized cost.

Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property is retired or otherwise disposed of, the cost and the related accumulated depreciation are removed from the accounts and any related gains or losses are recorded and reported as selling, general and administrative expenses.

WESCO assesses its long-lived assets for impairment by periodically reviewing operating performance and respective utilization of real and tangible assets. Upon closure of any branch, asset usefulness and remaining life are evaluated and charges are taken as appropriate. Of WESCO’s $210.7 million net book value of property, plant and equipment as of December 31, 2012, $136.8 million consists of land, buildings and leasehold improvements and are geographically dispersed among WESCO’s 475 branches and nine distribution centers, mitigating the risk of impairment. Approximately $28.5 million of assets consist of computer equipment and capitalized software and are evaluated for use and serviceability relative to carrying value. The remaining fixed assets, mainly of furniture and fixtures, warehousing equipment and transportation equipment, are similarly evaluated for serviceability and use.

Goodwill and Indefinite Life Intangible Assets

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Goodwill and indefinite life intangible assets are tested for impairment annually during the fourth quarter using information available at the end of September, or more frequently if events or circumstances occur indicating that their carrying value may not be recoverable. The evaluation of impairment involves comparing the current fair value of goodwill and indefinite life intangible assets to the recorded value. WESCO estimates the fair value of goodwill using a combination of discounted cash flow analyses and market multiples. Assumptions used for these fair value techniques are based on a combination of historical results, current forecasts, market data and recent economic events. WESCO evaluates the recoverability of indefinite life intangible assets using a discounted cash flow analysis based on projected financial information. The determination of fair value involves significant judgment and management applies its best judgment when assessing the reasonableness of financial projections. At December 31, 2012 and 2011, goodwill and indefinite life trademarks totaled $1,882.9 million and $1,055.0 million, respectively. No impairment losses were identified in 2012 as a result of this review. However, two trademarks valued at $18.1 million are sensitive to a further decline in financial performance. WESCO is taking actions to improve its future financial performance; however, WESCO cannot predict whether or not there will be certain events that could adversely affect the reported value of these trademarks.

Definite Lived Intangible Assets

Intangible assets are amortized over 4 to 20 years. A portion of intangible assets related to certain customer relationships are amortized using an accelerated method whereas all other intangible assets subject to amortization use a straight-line method which reflects the pattern in which the economic benefits of the respective assets are consumed or otherwise used. Intangible assets are tested for impairment if events or circumstances occur indicating that the respective asset might be impaired.

Insurance Programs

WESCO uses commercial insurance for auto, workers’ compensation, casualty and health claims as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductibles where WESCO must pay all costs up to the deductible amount. WESCO estimates the reserve based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time from incurrence of a claim until the claim is paid by the insurance provider. The total liability related to the insurance programs was $11.3 million at December 31, 2012 and $9.7 million at December 31, 2011.

Income Taxes

Income taxes are accounted for under the liability method in accordance with income tax accounting guidance. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. Valuation allowances, if any, are provided when it is more likely than not that a portion or all of a deferred tax asset may not be realized.

WESCO accounts for uncertainty in income taxes using a recognition threshold and measurement attribute prescribed by income tax accounting guidance. WESCO frequently reviews tax issues and positions taken on tax returns to determine the need and amount of contingency reserves necessary to cover any probable audit adjustments. WESCO recognizes interest related to unrecognized tax benefits as part of interest expense. Penalties are recognized as part of income tax expense.

Convertible Debentures

WESCO separately accounts for the liability and equity components of its convertible debentures in a manner that reflects its non-convertible debt borrowing rate. WESCO estimates its non-convertible debt borrowing rate through a combination of discussions with its financial institutions and review of relevant market data. The discounts to the convertible note balances are amortized to interest expense, using the effective interest method, over the implicit life of the Debentures.

Foreign Currency

The local currency is the functional currency for the majority of WESCO’s operations outside the United States. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at the average exchange rate prevailing during the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of other comprehensive income within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period.

Defined Benefit Pension Plan

In connection with the December 14, 2012 acquisition of EECOL, the Company assumed a contributory defined benefit plan covering all Canadian employees of EECOL. The plan provides retirement benefits based upon earnings and credited service, and participants contribute 2% or 4% of their earnings to the plan depending on their employment level.

The Company also assumed EECOL's Supplemental Executive Retirement Plan (SERP) which provides additional pension benefits to certain executives based on earnings, credited service, and executive service.

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Liabilities and expenses for pension benefits are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality).

The interest rate used to discount future estimated cash flows is determined using a high quality corporate bonds yield curve model developed with the assistance of an external actuary. The cash flows of the plans' projected benefit obligations are discounted using a single equivalent rate derived from yields on high quality corporate bonds. The yield curve model parallels the plans' projected cash flows. The discount rate used to determine benefit obligations for the Canadian pension was 4.5% in 2012. The impact on the liabilities of a change in the discount rate of one quarter percent would be approximately $5.1 million and either a charge or credit of $0.3 million to after-tax earnings in the following year.

The expected long-term rate of return on plan assets is applied to the fair market-related value of plan assets.

Stock-Based Compensation

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units, and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. Expected volatilities are based on historical volatility of WESCO’s common stock. The expected life of stock options and stock-settled appreciation rights is estimated using historical data pertaining to option exercises and employee terminations. The risk-free rate is based on the U.S. Treasury yields in effect at the time of grant. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. Performance-based awards are valued using a Monte Carlo simulation model. The probability of meeting market criteria is considered when calculating the estimated fair market value on the date of grant. These awards are accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest. No dividends are assumed for stock based awards.

Treasury Stock

Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock, with cost determined on a weighted average basis.

Fair Value of Financial Instruments

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and other accrued liabilities, and outstanding indebtedness. The estimated fair value of the Company’s outstanding indebtedness described in Note 7 at December 31, 2012 and 2011 was $2,423.7 million and $1,178.9 million, respectively. The aggregate fair value of the senior notes and debentures was approximately $1,704.5 million and $850.9 million at December 31, 2012 and 2011, respectively. The fair values of these fixed rate facilities are estimated based upon market price quotes. The fair values of the mortgage facility, the Term Loan, the accounts receivable securitization facility (the "Receivables Facility") and the revolving credit facility ("the Revolving Credit Facility"), approximated carrying values. The fair values for these facilities are based upon market price quotes and market comparisons available for instruments with similar terms and maturities. For all remaining WESCO financial instruments, carrying values are considered to approximate fair value due to their short maturities.

Environmental Expenditures

WESCO has facilities and operations that distribute certain products that must comply with environmental regulations and laws. Expenditures for current operations are expensed or capitalized, as appropriate. Expenditures relating to existing conditions caused by past operations, and that do not contribute to future revenue, are expensed. Liabilities are recorded when remedial efforts are probable and the costs can be reasonably estimated.

Reclassification

    Certain prior period balances within the financial statements have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (the "FASB") issued new disclosure guidance related to the presentation of the statement of comprehensive income. This guidance provides an entity the option to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements; the option to report other comprehensive income and its components in the statement of changes in stockholders' equity was eliminated. This accounting

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standard is effective for periods beginning on or after December 15, 2011. WESCO has elected the option to present the components of net income and the components of comprehensive income in a single continuous statement of comprehensive income.

In July 2012, the Financial Accounting Standards Board (the "FASB") issued updated guidance on the periodic testing of indefinite-lived intangible assets, other than goodwill, for impairment. This updated guidance will allow companies the option to first access qualitative factors to determine if it is more-likely-than-not that an indefinite-lived intangible asset might be impaired and whether it is necessary to perform the quantitative impairment test required under current accounting standards. This guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. WESCO will adopt this guidance in 2013. Adoption of this guidance is not expected to have a material impact on WESCO's financial position, results of operations or cash flows.

Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to WESCO’s financial position, results of operations or cash flows.

3. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following table sets forth the changes in the carrying amount of goodwill:

	Year Ended December 31
	2012			2011
	(In thousands)
Beginning balance January 1	$	1,008,127		$	985,714
Translation adjustments	(15,592		)	(3,597		)
Additions to goodwill for acquisitions	785,262			26,010
Ending balance December 31	$	1,777,797		$	1,008,127

WESCO has never recorded an impairment loss related to goodwill or intangible assets.

Intangible Assets

The components of intangible assets are as follows:

	December 31, 2012								December 31, 2011
	Life	Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount		Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount
	(In thousands)
Intangible assets:
Trademarks	Indefinite	$	105,080	$	—		$	105,080	$	46,852	$	—		$	46,852
Trademarks	4-15	1,734		(106		)	1,628		—		—			—
Non-compete agreements	5-7	1,950		(1,858		)	92		1,252		(1,038		)	214
Customer relationships	4-20	362,794		(40,094		)	322,700		70,670		(32,527		)	38,143
Distribution agreements	10-19	38,119		(9,298		)	28,821		35,291		(6,897		)	28,394
Patents	10	48,310		(9,870		)	38,440		48,310		(5,039		)	43,271
		$	557,987	$	(61,226	)	$	496,761	$	202,375	$	(45,501	)	$	156,874

_________________________

⁽¹⁾  Excludes the original cost and accumulated amortization of fully-amortized intangibles.

Amortization expense related to intangible assets totaled $15.1 million, $13.4 million and $7.5 million for the years ended December 31, 2012, 2011 and 2010, respectively.

The following table sets forth the estimated amortization expense for intangibles for the next five years (in thousands):

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	Estimated
	Amortization
For the year ended December 31,	Expense
2013	$	39,239
2014	38,014
2015	36,075
2016	34,889
2017	33,895

4. CONCENTRATIONS OF CREDIT RISK AND SIGNIFICANT SUPPLIERS

WESCO distributes its products and services and extends credit to a large number of customers in the industrial, construction, utility, commercial, institutional, and governmental markets. WESCO’s largest supplier accounted for approximately 12% of WESCO's purchases in 2012, 10% of purchases in 2011, and 12% of purchases in 2010, and therefore, WESCO could potentially incur risk due to supplier concentration. Based upon WESCO’s broad customer base, the Company has concluded that it has no material credit risk as a result of customer concentration.

5. ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

Year Ended December 31	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	1,609,785		$	54,663
Fair value of liabilities assumed	(288,005		)	(6,570		)
Deferred acquisition payments	—			—
Cash paid for acquisitions	$	1,321,780		$	48,093
Supplemental cash flow disclosure related to acquisitions:
Cash paid for acquisitions	$	1,321,780		$	48,093
Less: cash acquired	(32,300		)	—
Cash paid for acquisitions, net of cash acquired	$	1,289,480		$	48,093

Acquisition of EECOL Electric Corporation

On December 14, 2012, WESCO International completed its acquisition of EECOL Electric Corporation (“EECOL”). WESCO paid at closing a cash purchase price of approximately $1.1 billion, of which $50.8 million was placed in escrow to address post-closing purchase price adjustments and potential indemnification claims. The remaining escrow will be distributed to the sellers in June 2014. To fund the purchase price paid at closing, WESCO and its subsidiaries borrowed $851 million under new term loans and $264 million under the Revolving Credit Facility. With the acquisition of EECOL, WESCO obtained a 60% ownership in a joint venture. This entity has been consolidated. The noncontrolling interest incurred a gain of less than $0.1 million in 2012.

EECOL is a full-line distributor of electrical equipment, products and services with 57 locations across Canada and 20 in South America. EECOL has a warehouse-based business focused on serving industrial, oil, gas, mining, utility, and commercial and residential construction customers.

The preliminary purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The fair value of the intangible assets was estimated by management and the allocation resulted in intangible assets of $300.4 million and goodwill of $670.4 million which is not deductible for tax purposes. The intangible assets include customer relationships of $245.1 million amortized over 20 years and trademarks of $55.3 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for these intangible assets. The goodwill arising from the acquisition is based largely on the depth and diversity of name brand products, warehouse locations, and a highly-trained and knowledgeable workforce.

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Approximately $31.5 million of the $32.3 million of cash and equivalents that was transferred to the Company is expected to be remitted back to the sellers in May 2013, and accordingly, a corresponding liability has been recorded at December 31, 2012.

 The following summary presents the fair value of the assets acquired and liabilities assumed for the EECOL acquisition.

	EECOL
(In thousands)
Assets Acquired
Cash and cash equivalents	$	32,300
Trade accounts receivable	136,178
Other accounts receivable	23,187
Inventories	118,244
Prepaid expenses and other current assets	25,133
Property, buildings and equipment	73,129
Intangible assets	300,439
Goodwill	670,362
Other noncurrent assets	15,510
Total assets acquired	1,394,482
Liabilities Assumed
Accounts payable	76,509
Accrued expenses and other current liabilities	63,476
Short-term debt	5,734
Deferred income taxes - long-term	75,031
Long-term debt	6,205
Other long-term liabilities	46,870
Total liabilities assumed	273,825
Fair value of net assets acquired, including intangible assets	$	1,120,657

The operating results of EECOL have been included in WESCO's consolidated financial statements since December 14, 2012. EECOL has contributed $24.1 million to net sales. Unaudited pro forma results of operations (in thousands, except per share data) for the twelve months ended December 31, 2012 and 2011 are included below as if the acquisition occurred on the first day of the respective periods. This summary of the unaudited pro forma results of operations is not necessarily indicative of what WESCO's results of operations would have been had EECOL been acquired at the beginning of 2011, nor does it purport to represent results of operations for any future periods.

Year Ended December 31	2012		2011
(In thousands, except per share data)
Net Sales	$	7,493,978	$	6,980,120
Net Income	263,149		235,326
Earnings per common share:
Basic	$	6.02	$	5.44
Diluted	$	5.15	$	4.74

Acquisition of RS Electronics

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On January 3, 2012, WESCO completed its acquisition of RS Electronics, a leading North American distributor of electronic products serving primarily the industrial, medical equipment, automotive, and contract manufacturing end markets with eight branches located in the Midwest and southeastern United States and approximately $60.0 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill of $12.2 million. Management believes the majority of goodwill will be deductible for tax purposes.

Acquisition of Trydor Industries (Canada), Ltd.

On July 3, 2012, WESCO completed its acquisition of Trydor Industries (Canada), Ltd. (“Trydor”) through one of its wholly-owned Canadian subsidiaries. Trydor is a full-line distributor of high-voltage electrical products and services addressing the transmission, substation and distribution network needs for utilities, independent power producers and utility contractors in Canada with approximately $35.0 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $19.1 million and $11.8 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $8.9 million amortized over 10 years, supplier relationships of $2.7 million amortized over 10 years and trademarks of $0.2 million amortized over 4 years. No residual value is estimated for the intangible assets.

Acquisition of Conney Safety Products, LLC

On July 9, 2012, WESCO completed the acquisition of Conney Safety Products, LLC, a distributor of MRO safety products with approximately $85 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $83.6 million and $45.3 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $40.3 million amortized over 12 years, a trademark of $1.5 million amortized over 15 years, and a trademark valued at $3.5 million with an indefinite life. No residual value is estimated for the intangible assets.

2011 Acquisitions of RECO, LLC and Brews Supply, Ltd.

On March 14, 2011, WESCO Distribution, Inc. ("WESCO Distribution") completed its acquisition of RECO, LLC ("RECO"), a Siemens automation, controls, and electrical distributor located in the midwest and southeastern regions of the United States with approximately $25 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $6.0 million. Management believes the majority of goodwill will be deductible for tax purposes.

On October 3, 2011, WESCO Distribution through its wholly-owned Canadian subsidiary, completed its acquisition of Brews Supply, Ltd. ("Brews"), a full line electrical distributor of industrial, utility, and commercial products located in western Canada with approximately $50 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by an independent appraiser and the allocation resulted in goodwill and intangible assets of $19.8 million and $10.2 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $4.8 million amortized over 10 years, supplier relationships of $4.2 million amortized over 10 years and trademarks of $1.2 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for the intangible assets. With the acquisition of Brews, WESCO obtained a 49% ownership in a joint venture. This entity has been consolidated. The noncontrolling interest incurred a loss of less than $0.1 million in 2011 and 2012.

2010 Acquisitions of TVC Communications, L.L.C. and Potelcom Supply, Inc.

On December 16, 2010, WESCO Distribution completed its acquisition of TVC Communications, L.L.C. (“TVC Communications”), an international distributor in the Western Hemisphere of infrastructure products to the cable television and telecommunication industries. TVC Communications offers products necessary to build out a broadband network, ranging from

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the industry’s widest selection of premier branded components, to a variety of proprietary and private label products. TVC Communications also offers a full suite of value-added services, including design, engineering, installation, repair and maintenance.

WESCO paid at closing a cash purchase price of approximately $251.0 million, net of $1.5 million of cash acquired, of which $20.0 million was held in escrow to address post-closing working capital adjustments. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in intangible assets of $86.4 million and goodwill of $109.2 million. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include technology patents of $48.3 million amortized over 10 years, customer relationships of $20.6 million amortized over 10 years, supplier relationships of $9.7 million amortized over 15 years and trademarks of $7.8 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for the intangible assets.

The allocation of assets acquired and liabilities assumed for the TVC Communications acquisition is summarized below:

	TVC Communications, LLC
(In thousands)
Assets Acquired
Cash and cash equivalents	$	1,475
Trade accounts receivable	38,744
Other accounts receivable	978
Inventories	41,313
Prepaid expenses and other current assets	1,377
Property, buildings and equipment	2,268
Intangible assets	86,442
Goodwill	109,183
Other noncurrent assets	158
Total assets acquired	281,938
Liabilities Assumed
Accounts payable	24,249
Accrued payroll and benefit costs	1,183
Other current liabilities	4,019
Total liabilities assumed	29,451
Fair value of net assets acquired, including intangible assets	$	252,487

In 2010, TVC Communications contributed $6.9 million to net sales and had no impact on net income. Unaudited pro forma results of operations (in thousands, except per share data) for the twelve months ended December 31, 2010 are included below as if the acquisition occurred on the first day.

Year Ended December 31	2010
(In thousands, except per share data)
Net Sales	$	5,315,929
Net Income	132,455
Earnings per common share:
Basic	$	3.12
Diluted	$	2.87

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On June 30, 2010, WESCO Distribution completed its acquisition of Potelcom Supply, Inc., a single branch operation with annual sales of approximately $25 million serving the utility, industrial, and governmental markets in Alaska. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair value as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $10.7 million.

6. PROPERTY, BUILDINGS AND EQUIPMENT

The following table sets forth the components of property, buildings and equipment:

	December 31,
	2012			2011
	(In thousands)
Buildings and leasehold improvements	$	144,627		$	96,527
Furniture, fixtures and equipment	161,135			152,164
Software costs	54,652			44,909
	360,414			293,600
Accumulated depreciation and amortization	(199,115		)	(190,385		)
	161,299			103,215
Land	38,431			21,097
Construction in progress	10,993			9,238
	$	210,723		$	133,550

Depreciation expense was $14.4 million, $12.5 million and $11.7 million, and capitalized software amortization was $8.1 million, $5.7 million and $4.7 million, in 2012, 2011 and 2010, respectively. The unamortized software cost was $21.1 million and $19.7 million as of December 31, 2012 and 2011, respectively. Furniture, fixtures and equipment include capitalized leases of $11.2 million and $9.6 million and related accumulated amortization of $5.6 million and $4.7 million as of December 31, 2012 and 2011, respectively.

7. DEBT

The following table sets forth WESCO’s outstanding indebtedness:

	As of December 31,
	2012			2011
	(In thousands)
Term Loan Facility, less debt discount of $9,936	$	840,827		$	—
Mortgage financing facility	26,414			37,564
Accounts receivable securitization facility	445,000			250,000
Revolving credit facility	218,295			36,792
7.50% Senior Subordinated Notes due 2017	—			150,000
Foreign lines of credit	30,136			3,261
1.75% Convertible Senior Debentures due 2026, less debt discount of $0 in 2012 and 2011	—			56
6.0% Convertible Senior Debentures due 2029, less debt discount of $173,708 and $175,908 in 2012 and 2011, respectively	171,213			169,054
Capital leases	3,220			2,521
Other notes	67			85
Total debt	1,735,172			649,333
Less current and short-term portion	(39,759		)	(6,411		)
Total long-term debt	$	1,695,413		$	642,922

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Term Loan Facility

On December 12, 2012, WESCO Distribution, as U.S. borrower, WDCC (WDCC and together with WESCO Distribution, the “Borrowers”), as Canadian borrower, and WESCO International entered into a Term Loan Agreement (the “Term Loan Agreement”) among WESCO Distribution, WDCC, the Company, the lenders party thereto and Credit Suisse AG Cayman Islands Branch, as administrative agent and as collateral agent.

The Term Loan Agreement provides for a seven-year term loan facility (the “Term Loan Facility”), which consists of two separate sub-facilities: (i) a Canadian sub-facility in an aggregate principal amount of CAD $150.0 million, issued at a 2.0% discount, and (ii) a U.S. sub-facility in an aggregate principal amount of US $700.0 million, issued at a 1.0% discount. WESCO is amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $0.1 million was recorded for the year ended December 31, 2012. The debt discount amortization will be $1.4 million annually.

Subject to the terms of the Term Loan Facility, the Borrowers may request incremental term loans thereunder from time to time in an aggregate principal amount not to exceed at any time US $300.0 million, with an equivalent principal amount in U.S. Dollars being calculated for any incremental term loan denominated in Canadian Dollars, in order to finance certain permitted acquisitions. The proceeds of the Term Loan Facility were used to finance the acquisition of EECOL, to pay fees and expenses incurred in connection with the acquisition and certain other transactions. At December 31, 2012, WESCO had a balance outstanding under the facility of US $850.8 million.

Borrowings under the Term Loan Facility bear interest at base rates plus applicable margins. At December 31, 2012, the interest rates on borrowings under the Canadian sub-facility and U.S. sub-facility were approximately 5.2% and 4.5%, respectively. The Borrowers will pay quarterly installments of principal equal to 0.25% of the original principal amount of their respective term loans, plus accrued and unpaid interest, beginning on March 31, 2013. To the extent not previously paid, the term loans will become due and payable on December 12, 2019, with any unpaid incremental term loans becoming due and payable on the respective maturity dates applicable to those incremental term loans. Other than in certain circumstances prior to the first anniversary of the closing of the Term Loan Facility, at any time or from time to time, the Borrowers may prepay borrowings under the Term Loan Facility in whole or in part without premium or penalty. The Borrowers' obligations under the Term Loan Facility are secured by substantially all of the assets of the Borrowers, the Company and certain of the Company's other subsidiaries; provided that, with respect to borrowings under the U.S. sub-facility, the collateral does not include assets of certain foreign subsidiaries or more than sixty-five percent of the issued and outstanding equity interests in certain foreign subsidiaries.

The Term Loan Facility contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Term Loan Parties with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. The Term Loan Facility also provides for customary events of default.

Mortgage Financing Facility

In 2003, WESCO finalized a mortgage financing facility of $51 million, of which $26.4 million was outstanding as of December 31, 2012. Total borrowings under the mortgage financing facility are subject to a 22-year amortization schedule, with a balloon payment due during the first quarter of 2013. The interest rate on borrowings under this facility is fixed at 6.5%. The Company's intent is to pay the 2013 obligations of 26.4 million utilizing the Revolving Credit Facility and therefore this facility is classified as long-term.

Accounts Receivable Securitization Facility

On December 11, 2012, WESCO Distribution entered into an amendment of the Receivables Facility pursuant to the terms and conditions of a Seventh Amendment to Third Amended and Restated Receivables Purchase Agreement, dated as of December 11, 2012 (the “Amendment”), by and among WESCO Receivables Corp. (“WESCO Receivables”), WESCO Distribution, the Purchasers and Purchaser Agents party thereto and PNC Bank, National Association, as Administrator. The Amendment, among other things, added certain defined terms and amended certain other terms such as change in control, excluded receivables, and an intercreditor agreement. Substantially all other terms and conditions of the Receivables Facility remain unchanged. In addition, on December 11, 2012, WESCO Distribution and WESCO Receivables exercised an existing accordion feature under the Receivables Facility to increase the purchasing limit thereunder from $450.0 million to $475.0 million. The Receivables Facility matures in August 2014.

Under the Receivables Facility, WESCO sells, on a continuous basis, an undivided interest in all domestic accounts receivable to WESCO Receivables Corp., a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to third-party conduits and financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. WESCO has agreed to continue

45

servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.

As of December 31, 2012 and 2011, accounts receivable eligible for securitization totaled approximately $601.1 million and $613.9 million, respectively. The consolidated balance sheets as of December 31, 2012 and 2011 include $445.0 million and $250.0 million, respectively, of account receivable balances legally sold to third parties, as well as borrowings for equal amounts. At December 31, 2012, the interest rate on borrowings under this facility was approximately 1.4%.

Revolving Credit Facility

On December 12, 2012, WESCO Distribution and certain other subsidiaries of the Company entered into a US $600.0 million revolving credit facility, which includes a letter of credit sub-facility of up to US $90.0 million in the aggregate, pursuant to the terms and conditions of an Amended and Restated Credit Agreement, dated as of December 12, 2012, among WESCO Distribution, the other U.S. Borrowers party thereto, WESCO Distribution Canada LP (“WESCO Canada”) and WDCC Enterprises, Inc. (“WDCC), as Canadian Borrowers, the other Loan Parties party thereto, the Lenders party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and JPMorgan Chase Bank, N.A., Toronto Branch, as Canadian Administrative Agent. Upon completion of the acquisition of EECOL on December 14, 2012, EECOL was added as a Canadian Borrower. The Revolving Credit Facility contains an accordion feature allowing WESCO Distribution to request increases to the borrowing commitments under the Credit Facility of up to US $100.0 million in the aggregate. The Revolving Credit Facility replaced WESCO Distribution's US $400.0 million revolving credit facility originally entered into on August 22, 2011.

The Revolving Credit Facility matures in August 2016 and consists of two separate sub-facilities: (i) a Canadian sub-facility with a borrowing limit of up to US $400.0 million, which is collateralized by substantially all assets of WESCO Canada, WDCC and EECOL, and (ii) a U.S. sub-facility with a borrowing limit of up to US $600.0 million less the amount of outstanding borrowings under the Canadian sub-facility. The U.S. sub-facility is collateralized by substantially all assets of WESCO Distribution and its U.S. subsidiaries other than real property and accounts receivable sold or intended to be sold pursuant to the Receivables Facility. Availability under the Revolving Credit Facility is based upon the amount of eligible inventory and receivables applied against certain advance rates. The applicable interest rate for borrowings under the Revolving Credit Facility includes interest rate spreads based on available borrowing capacity that range between 1.5% and 2.0% for LIBOR-based borrowings and 0.5% and 1.0% for prime rate-based borrowings. The otherwise applicable interest rate is reduced by 0.25% if the Company's leverage ratio falls below a ratio of 2.5 to 1.0. At December 31, 2012, the interest rate on borrowings under this facility was approximately 2.5%.

The Credit Agreement contains customary affirmative and negative covenants for credit facilities of this type, including limitations on WESCO Distribution, the Company and certain of the Company's other subsidiaries with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. Subject to the terms of the Credit Agreement, the Company is permitted to pay dividends, repurchase common stock or repurchase indebtedness without limitation so long as pro forma combined availability under the Revolving Credit Facility and the Receivables Facility exceeds US $160.0 million and the adjusted fixed charge ratio is not less than a ratio of 1.1 to 1.0.

During 2012, WESCO borrowed $814.1 million in the aggregate under the Revolving Credit Facility and made repayments in the aggregate amount of $632.9 million. During 2011, aggregate borrowings and repayments were $435.7 million and $398.9 million, respectively. At December 31, 2012, WESCO had a balance outstanding of $218.3 million under the Revolving Credit facility. WESCO had $270.9 million available under the Revolving Credit facility at December 31, 2012, after giving effect to outstanding letters and foreign lines of credit, as compared to approximately $299.3 million at December 31, 2011.

7.50% Senior Subordinated Notes due 2017

On December 10, 2012, WESCO International announced that WESCO Distribution would redeem all of its outstanding 7.50% Senior Subordinated Notes due 2017 (the “2017 Notes”) on January 9, 2013 (the “Redemption Date”) at a redemption price equal to 101.25% of the principal amount thereof plus accrued and unpaid interest to, but excluding, the Redemption Date, for a total of 103% of the principal amount of 2017 Notes. The aggregate principal amount of 2017 Notes outstanding was $150.0 million. On December 11, 2012, in accordance with the terms of the Indenture, dated as of September 27, 2005, among WESCO Distribution, WESCO International and The Bank of New York Mellon, as trustee (the “Trustee”), WESCO Distribution irrevocably deposited with the Trustee funds sufficient to pay principal and interest of all outstanding 2017 Notes on the Redemption Date. As a result, the Indenture was satisfied and discharged.

Foreign Lines of Credit

Certain foreign subsidiaries of WESCO have entered into uncommitted lines of credit, which serve as overdraft facilities, to support local operations. The maximum borrowing limit varies by facility and ranges between US $0.5 million and US $8.0 million. The applicable interest rate for borrowings under these lines of credit varies by country and is governed by the

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applicable loan agreement. The foreign lines of credit are renewable on an annual basis and are fully and unconditionally guaranteed by WESCO Distribution. Accordingly, these lines directly reduce availability under the Revolving Credit Facility.

1.75% Convertible Senior Debentures due 2026

Proceeds of $300 million were received in connection with the issuance of the 2026 Debentures by WESCO International in November 2006. On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 1.75% Convertible Senior Debentures due 2026 (the "2026 Debentures") and 2.625% Convertible Senior Debentures due 2025 (the "2025 Debentures"), respectively (see the 6.0% Convertible Senior Debentures due 2029 discussion below for additional information). On November 30, 2011, WESCO International announced that it would redeem all of its 2026 Debentures on January 3, 2012. WESCO International redeemed the remaining $0.1 million aggregate principal amount of outstanding 2026 Debentures at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. Following the redemption on January 3, 2012, there were no 2026 Debentures outstanding.

On January 1, 2009, WESCO retrospectively applied the provisions of guidance concerning convertible debt instruments to the 2026 Debentures. WESCO utilized an interest rate of 6% to reflect the non-convertible market rate of its offering upon issuance. WESCO amortized the debt discount over a five year period starting on the date of issuance. Non-cash interest expense of less than $0.1 million was recorded for the years ended December 31, 2012 and 2011.

6.0% Convertible Senior Debentures due 2029

On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 2026 Debentures and 2025 Debentures, respectively. As a result of the debt exchange, WESCO recorded a gain of $6.0 million, which included the write-off of debt issuance costs. The 2029 Debentures were issued pursuant to an Indenture dated August 27, 2009 (the “Indenture”), with The Bank of New York Mellon, as trustee, and are unconditionally guaranteed on an unsecured senior subordinate basis by WESCO Distribution.

WESCO utilized an interest rate of 13.875% to reflect the non-convertible debt borrowing rate of its offering upon issuance, which was determined based on discussions with its financial institutions and a review of relevant market data, and resulted in a$181.2 million discount to the 2029 Debenture balance and a net increase in additional capital of $106.5 million. In addition, the financing costs related to the issuance of the 2029 Debentures were allocated between the debt and equity components. WESCO is amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $2.2 million and $2.5 million was recorded for the years ended December 31, 2012 and 2011, respectively. The debt discount amortization will approximate $2.9 million in 2013, $3.3 million in 2014, $3.8 million in 2015, $4.3 million in 2016, and $4.9 million in 2017.

While the 2029 Debentures accrue interest at an effective interest rate of 13.875% (as described above), the coupon interest rate of 6.0% per annum is payable in cash semi-annually in arrears on each March 15 and September 15, and commenced March 15, 2010. Beginning with the six-month period commencing September 15, 2016, WESCO will also pay contingent interest in cash during any six-month period in which the trading price of the 2029 Debentures for each of the five trading days ending on the second trading day immediately preceding the first day of the applicable six-month interest period equals or exceeds 120% of the principal amount of the 2029 Debentures. During any interest period when contingent interest shall be payable, the contingent interest payable per $1,000 principal amount of 2029 Debentures will equal 0.25% of the average trading price of $1,000 principal amount of the 2029 Debentures during the five trading days immediately preceding the first day of the applicable six-month interest period. In accordance with guidance related to derivatives and hedging, the contingent interest feature of the 2029 Debentures is an embedded derivative that is not considered clearly and closely related to the host contract. The contingent interest component had no significant value at December 31, 2012 or 2011.

The 2029 Debentures are convertible into cash, and in certain circumstances, shares of WESCO International’s common stock, $0.01 par value, at any time on or after September 15, 2028, or prior to September 15, 2028 in certain circumstances. The 2029 Debentures will be convertible based on an initial conversion rate of 34.6433 shares of common stock per $1,000 principal amount of the 2029 Debentures (equivalent to an initial conversion price of approximately $28.87 per share). The conversion rate and conversion price may be adjusted under certain circumstances.

At any time on or after September 15, 2016, the Company may redeem all or a part of the 2029 Debentures plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the redemption date. If WESCO International undergoes certain fundamental changes, as defined in the Indenture, prior to maturity, holders of the 2029 Debentures will have the right, at their option, to require WESCO International to repurchase for cash some or all of their 2029 Debentures at a repurchase price equal to 100% of the principal amount of the 2029 Debentures being repurchased, plus

47

accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the repurchase date.

The following table sets forth the components of WESCO’s outstanding convertible debenture indebtedness:

	December 31, 2012							December 31, 2011
	Principal Balance		Discount			Net Carrying Amount		Principal Balance		Discount			Net Carrying Amount
(In thousands)
Convertible Debentures:
2026	$	—	$	—		$	—	$	56	$	—		$	56
2029	344,921		(173,708		)	171,213		344,962		(175,908		)	169,054
	$	344,921	$	(173,708	)	$	171,213	$	345,018	$	(175,908	)	$	169,110

Covenant Compliance

WESCO was in compliance with all relevant covenants contained in its debt agreements as of December 31, 2012.

The following table sets forth the aggregate principal repayment requirements for all indebtedness for the next five years and thereafter, as of December 31, 2012:

(In thousands)
2013	$	66,173
2014	454,436
2015	9,192
2016	227,162
2017	8,691
Thereafter	1,153,162
Total payments on debt	1,918,816
Debt discount on convertible debentures and term loan facility	(183,644		)
Total long-term debt	$	1,735,172

WESCO’s credit agreements contain various restrictive covenants that, among other things, impose limitations on (i) dividend payments or certain other restricted payments or investments; (ii) the incurrence of additional indebtedness and guarantees; (iii) creation of liens; (iv) mergers, consolidation or sales of substantially all of WESCO’s assets; (v) certain transactions among affiliates; (vi) payments by certain subsidiaries to WESCO; and (vii) capital expenditures. In addition, the revolving credit agreement and Receivables Facility require WESCO to meet certain fixed charge coverage tests depending on availability or liquidity, respectively.

8. CAPITAL STOCK

Preferred Stock

There are 20 million shares of preferred stock authorized at a par value of $.01 per share. The Board of Directors has the authority, without further action by the stockholders, to issue all authorized preferred shares in one or more series and to fix the number of shares, designations, voting powers, preferences, optional and other special rights and the restrictions or qualifications thereof. The rights, preferences, privileges and powers of each series of preferred stock may differ with respect to dividend rates, liquidation values, voting rights, conversion rights, redemption provisions and other matters.

Common Stock

There are 210 million shares of common stock and 20 million shares of Class B common stock authorized at a par value of $.01 per share. The Class B common stock is identical to the common stock, except for voting and conversion rights. The holders of Class B common stock have no voting rights. With certain exceptions, Class B common stock may be converted, at the option of the holder, into the same number of shares of common stock.

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Under the terms of the Revolving Credit Facility and the Term Loan Agreement, WESCO International is restricted from declaring or paying dividends and as such, at December 31, 2012 and 2011, no dividends had been declared, and therefore no retained earnings were reserved for dividend payments.

Additional Capital

WESCO separately accounts for the liability and equity components of its 2029 Debentures and 2026 Debentures in a manner that reflects its non-convertible debt borrowing rate. As of December 31, 2012 and 2011, the net equity included in additional capital related to the 2029 Debentures and 2026 Debentures totaled $106.3 million and $106.4 million, respectively.

9. EQUITY INVESTMENT

During the first quarter of 2008, WESCO and Deutsch Engineered Connecting Devices, Inc. (“Deutsch”) completed a transaction with respect to WESCO’s LADD operations, which resulted in a joint venture in which Deutsch owned a 60% interest and WESCO owned a 40% interest. WESCO accounted for its investment in the joint venture using the equity method of accounting. Accordingly, earnings from the joint venture were recorded as other income in the consolidated statement of income. Deutsch was entitled, but not obliged, to acquire the remaining 40% after January 1, 2010. Deutsch paid to WESCO aggregate consideration of approximately $75.0 million, consisting of $60.0 million in cash plus a $15.0 million promissory note for its 60% interest in the joint venture.

On January 15, 2010, WESCO received $1.8 million in accrued interest related to the promissory note for the period from January 2, 2008 to January 2, 2010. In addition, Deutsch and WESCO entered into an amended promissory note agreement. The amendment extended the maturity date for the payment of principal and interest to the earlier of (a) the closing date of Deutsch’s option to acquire the remaining 40% joint venture interest or (b) the maturity date of Deutsch’s credit facility or mezzanine financing facility. Interest accrued at a rate of 8.5% compounded annually. Management believed this rate was commensurate with a market rate of interest; therefore, no reserve or allowance was recorded against the promissory note.

On April 30, 2010, Deutsch notified WESCO it would exercise its option to purchase the remaining 40% of the LADD joint venture. The option price for Deutsch to acquire the remaining 40% of the joint venture was determined based upon a multiple of trailing earnings, with a minimum purchase price of $40.0 million and maximum purchase price of $50.0 million. The investment in the LADD joint venture at March 31, 2010 was $43.4 million, and the estimated option exercise price was $40.0 million. As a result, WESCO recorded a pre-tax impairment loss of $3.4 million to selling, general and administrative expenses during the first quarter of 2010. On June 7, 2010, WESCO completed the sale of its 40% interest in the LADD joint venture and recorded an additional impairment charge of $0.4 million to selling, general and administrative expenses. WESCO received $40.0 million for its 40% interest plus $15.0 million for the outstanding promissory note and $0.5 million for accrued interest.

10. INCOME TAXES

The following table sets forth the components of the provision for income taxes:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
Current taxes:
Federal(1)	$	51,132	$	60,415	$	11,363
State	6,006		5,705		2,018
Foreign	5,079		2,643		7,801
Total current	62,217		68,763		21,182
Deferred taxes:
Federal	15,034		9,692		21,069
State	1,080		2,187		1,112
Foreign	1,549		2,494		(1,199		)
Total deferred	17,663		14,373		20,982
	$	79,880	$	83,136	$	42,164

_________________________

⁽¹⁾  Tax benefits related to stock options and other equity instruments recorded directly to additional paid in capital totaled $11.3 million, $5.6 million and $8.2 million in 2012, 2011 and 2010, respectively.

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The following table sets forth the components of income before income taxes by jurisdiction:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
United States	$	255,700	$	260,859	$	166,108
Foreign	25,938		18,517		(8,467		)
	$	281,639	$	279,376	$	157,641

The following table sets forth the reconciliation between the federal statutory income tax rate and the effective rate:

	Year Ended December 31
	2012		2011		2010
Federal statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal tax benefit	1.8		2.1		1.5
Nondeductible expenses	1.0		0.7		1.3
Domestic tax benefit from foreign operations	(0.2	)	—		(0.3	)
Foreign tax rate differences	(0.9	)	(0.8	)	0.2
Tax effect of intercompany financing	(6.3	)	(6.1	)	(10.6	)
Federal tax credits	—		(0.1	)	(0.1	)
Domestic production activity deduction	(0.5	)	(0.5	)	(0.5	)
Adjustment related to uncertain tax positions	(0.6	)	(0.7	)	(4.2	)
Revaluation of deferred tax items	(0.1	)	0.4		1.9
Other	(0.8	)	(0.2	)	2.5
	28.4	%	29.8	%	26.7	%

As of December 31, 2012, WESCO had approximately $323.5 million of undistributed earnings related to its foreign subsidiaries. Management believes that these earnings will be indefinitely reinvested in foreign jurisdiction; accordingly, WESCO has not provided for U.S. federal income taxes related to these earnings.

The following table sets forth deferred tax assets and liabilities:

	December 31
	2012				2011
			(In thousands)
	Assets		Liabilities		Assets		Liabilities
Accounts receivable	$	2,518	$	—	$	4,015	$	—
Inventory	—		4,412		—		6,515
Depreciation	—		13,423		—		6,064
Amortization of intangible assets	—		242,745		—		162,675
Convertible debt interest	—		105,871		—		93,736
Employee benefits	40,485		—		30,454		—
Tax loss carryforwards	23,289		—		24,232		—
Other	50,723		8,558		37,529		3,938
Total deferred taxes	$	117,015	$	375,009	$	96,230	$	272,928

As of December 31, 2012 and 2011, WESCO had state tax benefits derived from net operating loss carryforwards of approximately $6.7 million ($4.4 million, net of federal income tax) and $6.3 million ($4.0 million, net of federal income tax), respectively. In addition, WESCO had tax benefits from net operating losses resulting from the recapitalization of its Canadian

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operations of $18.9 million and $20.2 million, respectively. The amounts will begin expiring in 2013 and 2027, respectively. Utilization of WESCO’s state net operating loss carryforwards is subject to annual limitations imposed by state statute. Such annual limitations could result in the expiration of the net operating loss and tax credit carryforwards before utilization. Management anticipates utilizing the net operating losses prior to the expiration of statutes of limitations; accordingly, WESCO has not recorded a valuation allowance.

WESCO analyzes its filing positions for all open tax years in all jurisdictions. The Company is currently under examination in several tax jurisdictions, both within the United States and outside the United States, and remains subject to examination until the statute of limitations expires for the respective tax jurisdictions. The following summary sets forth the tax years that remain open in the Company’s major tax jurisdictions:

United States — Federal	2000 and forward *
United States — States	2007 and forward
Canada	2003 and forward

* Open by waiver of statute only.

The following table sets forth the reconciliation of gross unrecognized tax benefits:

	December 31,
	2012			2011			2010
	(In thousands)
Beginning balance January 1	$	20,878		$	3,394		$	8,085
Additions based on tax positions related to the current year	929			265			1,439
Additions for tax positions of prior years(1)	1,224			20,064			4,668
Additions for acquired tax positions	1,825			—			—
Reductions for tax positions of prior years	(85		)	(2,161		)	(8,818		)
Settlements	(3,400		)	(512		)	(1,368		)
Lapse in statute of limitations	(296		)	(172		)	(612		)
Ending balance December 31	$	21,075		$	20,878		$	3,394

_________________________

⁽¹⁾     In 2011, additions for tax positions of prior years primarily relate to transfer pricing issues between the United States

and Canada, which are under review by the Canadian Competent Authority. A corresponding deferred tax asset in the amount of $23.1 million excluding interest has been recorded for the position in the United States.

The total amount of unrecognized tax benefits were $21.1 million, $20.9 million and $3.4 million as of December 31, 2012, 2011 and 2010, respectively. If these tax benefits were recognized in the consolidated financial statements, the portion of these amounts that would reduce the Company’s tax provision would be $21.2 million, $19.7 million, and $1.9 million respectively. The amount in 2012 would be offset by the corresponding deferred tax asset discussed above.

During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits will decrease by as much as $14.7 million ($12.2 million of which will be offset by the reversal of a deferred tax asset) due to certain issues being settled by the resolution of federal, state and/or foreign tax examinations and/or the expiration of statutes of limitations. Management does not expect this decrease to have an impact on the effective tax rate.

WESCO records interest related to uncertain tax positions as a part of interest expense in the consolidated statement of income. Any penalties are recognized as part of income tax expense. Penalties recorded to income tax expense were immaterial for 2012, 2011 and 2010. As of December 31, 2012 and 2011, WESCO had an accrued liability of $8.0 million and $11.4 million, respectively, for interest related to uncertain tax positions. During 2012 accrued interest decreased by $3.4 million primarily as a result of a favorable Internal Revenue Service appeals settlement in the first quarter related to the years 2000 to 2006.

11. EARNINGS PER SHARE

Basic earnings per share are computed by dividing net income by the weighted average common shares outstanding during the periods. Diluted earnings per share are computed by dividing net income by the weighted average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the

51

diluted earnings per share computation using the treasury stock method, which includes consideration of stock-based compensation.

The following table sets forth the details of basic and diluted earnings per share:

	Year Ended December 31
	2012		2011		2010
(In thousands, except per share data)
Net income	$	201,777	$	196,251	$	115,477
Weighted average common shares outstanding used in computing basic earnings per share	43,677		43,220		42,499
Common shares issuable upon exercise of dilutive stock options	1,147		1,179		840
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,310		5,224		2,774
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,133		49,623		46,113
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.62	$	4.54	$	2.72
Diluted	$	3.95	$	3.96	$	2.50

As of December 31, 2012, 2011 and 2010, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded stock-settled stock appreciation rights of approximately 0.9 million, 1.2 million and 2.4 million at weighted average exercise prices of $64.17 per share, $62.48 per share and $46.73 per share, respectively. These amounts were excluded because their effect would have been antidilutive.

Because of WESCO’s obligation to settle the par value of the 2029 Debentures in cash, WESCO is not required to include any shares underlying the 2029 Debentures in its diluted weighted average shares outstanding until the average stock price per share for the period exceeds the conversion price of the 2029 Debentures. At such time, only the number of shares that would be issuable (under the treasury stock method of accounting for share dilution) will be included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion price of the 2029 Debentures is $28.87. Share dilution is limited to a maximum of 11,949,205 shares for the 2029 Debentures. For the periods ended December 31, 2012, 2011, and 2010, the effect of the 2029 Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.56 , $0.47, and $0.16, respectively.

12. EMPLOYEE BENEFIT PLANS

Defined Contribution Plans

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their service rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO will make contributions in an amount equal to 50% of the participant’s total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO will make contributions in an amount ranging from 1% to 7% of the participant’s eligible compensation based on years of continuous service. In addition, employer contributions may be made at the discretion of the Board of Directors. Discretionary employer contributions charges of $18.6 million, $16.2 million, and $14.2 million were incurred in 2012, 2011, and 2010, respectively. For the years ended December 31, 2012, 2011 and 2010, WESCO incurred charges of $31.8 million, $27.6 million, and $25.3 million, respectively, for all such plans. Contributions are made in cash to employee retirement savings plan accounts. Employees then have the option to transfer balances allocated to their accounts into any of the available investment options, including WESCO common stock.

Defined Benefit Plans

In connection with the December 14, 2012 acquisition of EECOL discussed in Note 5, the Company assumed a contributory defined benefit plan covering all employees of EECOL. The plan provides retirement benefits based on earnings and credited service, and participants may contribute 2% of their earnings to the plan. Participants become 100% vested after two years of continuous service.

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The Company also assumed EECOL's Supplemental Executive Retirement Plan (SERP) which provides additional pension benefits to certain executives based on earnings, credited service, and executive service. Participants in the plan are vested after two years of continuous service and may contribute 4% of their earnings to the plan.

The following tables present the changes in benefit obligations, plan assets and funded status for the pension plans and the components of net periodic pension cost.

Year ended December 31, 2012 (In thousands)
Accumulated Benefit Obligation (ABO) at December 31	$	80,252
Change in Projected Benefit Obligation (PBO)
PBO at beginning of year	$	—
Effect of acquisition	102,829
Service cost	158
Interest cost	217
Participant contributions	85
Actuarial loss (gain), including assumption changes	277
Benefits paid	(100		)
PBO at end of year	$	103,466
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	—
Effect of acquisition	60,297
Actual return on plan assets	870
Employee contributions	85
Company contributions	298
Benefits paid	(100		)
Plan assets at end of year	$	61,450
Funded status	$	(42,016	)
Amounts recognized in the balance sheet
Current liabilities	$	(201	)
Non-current liabilities	(41,815		)
Net pension liability at end of year	$	(42,016	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	(414	)
Prior service cost	—
Total recognized in accumulated other comprehensive loss	$	(414	)

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Year ended December 31, 2012 (In thousands)
Net Periodic Pension Cost
Service cost	$	158
Interest cost	217
Expected return on plan assets	(177		)
Total net periodic pension cost	$	198
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	(416	)
Total recognized in other comprehensive earnings	$	(416	)
Total recognized in net periodic pension cost and other comprehensive earnings	$	(218	)

Actuarial assumptions used to determine benefit obligations at December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Average salary increases	4.0	%	4.0	%

Actuarial assumptions used to determine net periodic pension cost for the year ended December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Expected return on long-term assets	6.3	%	n/a
Rate of compensation increase	4.0	%	4.0	%

The following benefit payments, which reflect expected future service, are expected to be paid:

Years ending December 31 (In thousands)
2013	$	1,921
2014	2,171
2015	2,568
2016	2,645
2017	2,734
2018-2023	16,724

The Company expects to contribute approximately $3.9 million to the plans in 2013.

The Company's pension plan weighted asset allocations as of December 31, 2012 by asset category are as follows:

Asset Category
Equity securities	57.7	%
Debt securities	42.3	%
	100.0	%

The Plan's long-term overall objective is to maintain benefits at their current level without affecting the cost of maintaining the plan, assuming that the demographic make-up of the group of members remains the same.

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The primary investment objective, in support of the overall objective, is to earn the highest rate of return possible for the Plan, while keeping risk at acceptable levels. The long-term return objective of the Plan is to achieve a minimum annualized rate of return in excess of the actuarial requirements. This translates into a required return of 3.5% percent above inflation, net of investment management fees. The return objective is consistent with the overall investment risk level that the Plan assumes in order to meet the pension obligations of the Plan. To achieve this long term investment objective, the Plan has adopted an asset mix that has a combination of equity and fixed income investments. Risk is controlled by investing in a well-diversified portfolio of asset classes. To meet this objective, a benchmark portfolio is established based on the expected returns for each asset class available. The investment of the Plan's assets in accordance with the benchmark portfolio should enable the Plan to not only attain, but also exceed the minimum overall objective.

The following table presents the target asset mix based on market value for each investment category within which the investment managers must invest the Plan's assets. The manager is required to rebalance the asset mix back to the target on a quarterly basis.

Asset Category	Target %
Canadian equities	25	%
U.S. equities	15	%
Non-North American equities	20	%
Total equities	60	%
Fixed income bond managers	40	%

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (2) an entity's own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset and liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

The following section describes the valuation methodologies used by the trustees to measure the fair value of plan assets, including an indication of the level in the fair value hierarchy in which each type of asset is generally classified.

Equity Securities. These securities consist of the plan's share of segregated funds that invest in the stock of publicly traded companies and are valued at the net asset value of shares held at December 31. As such, these securities are generally included in Level 2.

Debt Securities. These securities consist of segregated funds that invest in publicly traded U.S and non-U.S. fixed interest obligations and government securities and are valued through consultation and evaluation with brokers in the institutional market using other observable market data. As such, these securities are generally included in Level 2. Also, these securities include cash and cash equivalents consisting of money market funds and are generally valued using quoted prices or observable market data. As such, these funds are included in Level 1.

The fair value methods described above may not be indicative of net realizable value or reflective of future fair values. Additionally, while the Company believes the valuation method used by the plan's trustee is appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The following table represents the fair value of plan assets classified under the appropriate level of fair value hierarchy:

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	Level 1		Level 2		Level 3		Total
Equity securities	$	—	$	35,223	$	—	$	35,223
Debt securities	505		25,722		—		26,227
Total investments	$	505	$	60,945	$	—	$	61,450

13. STOCK-BASED COMPENSATION

WESCO has sponsored four stock option plans: the 1999 Long-Term Incentive Plan (“LTIP”), the 1998 Stock Option Plan, the Stock Option Plan for Branch Employees and the 1994 Stock Option Plan. The LTIP was designed to be the successor plan to all prior plans. Any shares remaining reserved for future issuance under the prior plans are available for issuance under the LTIP. The LTIP and predecessor plans are administered by the Compensation Committee of the Board of Directors.

An initial reserve of 6,936,000 shares of common stock has been authorized for issuance under the LTIP. This reserve automatically increases by (i) the number of shares of common stock covered by unexercised options granted under prior plans that are canceled or terminated after the effective date of the LTIP, and (ii) the number of shares of common stock surrendered by employees to pay the exercise price and/or minimum withholding taxes in connection with the exercise of stock options granted under our prior plans. As of December 31, 2012, 2.3 million shares of common stock were reserved under the LTIP for future equity award grants. In December 2003, in a privately negotiated transaction, WESCO redeemed the net equity value of stock options originally granted in 1994 and 1995, representing approximately 2.9 million shares. These shares are included in the reserve of common stock available for issuance under the LTIP.

Except for the performance-based award, awards granted vest and become exercisable once criteria based on time is achieved. Performance-based awards vest based on market or performance conditions. All awards vest immediately in the event of a change in control. Each award terminates on the tenth anniversary of its grant date unless terminated sooner under certain conditions.

As of December 31, 2012, there was $18.0 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements for all awards previously made of which approximately $11.5 million is expected to be recognized in 2013, $5.9 million in 2014 and $0.7 million in 2015.

The total intrinsic value of awards exercised during the years ended December 31, 2012, 2011, and 2010 was $41.1 million, $13.8 million, and $9.9 million, respectively. The total amount of cash received from the exercise of options was $3.2 million, $0.4 million, and $1.8 million, respectively. The tax benefit associated with the exercise of stock options and stock-settled stock appreciation rights totaled $11.4 million, $5.4 million , and $3.1 million in 2012 , 2011, and 2010, respectively. WESCO uses the direct only method and tax law ordering approach to calculate the tax effects of stock-based compensation. The tax benefit was recorded as a credit to additional paid-in capital.

The following table sets forth a summary of both stock options and stock appreciation rights and related information for the years indicated:

	2012							2011				2010
	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value (In thousands)		Awards		Weighted Average Exercise Price		Awards		Weighted Average Exercise Price
Beginning of year	4,266,533		$	39.64				4,498,303		$	36.38	4,226,153		$	35.30
Granted	257,932		64.12					399,260		59.16		708,949		33.19
Exercised	(1,340,986	)	30.54					(543,154	)	25.83		(335,155	)	14.79
Cancelled	(41,458	)	49.96					(87,876	)	46.86		(101,644	)	40.62
End of year	3,142,021		45.40		5.8	$	53,058	4,266,533		39.64		4,498,303		36.38
Exercisable at end of year	2,450,391		$	43.16	5.1	$	46,898	3,176,161		$	39.23	3,011,120		$	38.65

WESCO granted the following stock-settled stock appreciation rights at the following weighted average assumptions:

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	2012	2011	2010
Stock-settled appreciation rights granted	257,932	399,260	708,949
Risk free interest rate	0.9%	2.3%	1.8%
Expected life (in years)	5	5	5
Expected volatility	50%	49%	49%

The following table sets forth a summary of time-based restricted stock units and related information for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(80,539	)	26.02
Forfeited	(10,141	)	46.09
Unvested at December 31, 2012	187,335		$	52.28

The weighted average fair value per stock-settled appreciation right granted was $27.89, $26.46 and $14.71 for the years ended December 31, 2012, 2011 and 2010, respectively. The weighted average fair value per restricted stock unit granted was $64.27, $60.05 and $33.05 for the years ended December 31, 2012, 2011 and 2010, respectively. WESCO recognized $15.1 million, $15.4 million and $15.8 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, in 2012, 2011 and 2010, respectively.

The following table sets forth a summary of performance-based awards for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at December 31, 2012	46,500		$	75.72

The performance-based awards in the table above include 23,250 shares, and the ultimate number of shares that vest will be dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are valued based upon a Monte Carlo simulation model. The probability of meeting the market criteria was considered when calculating the estimated fair market value on the date of grant. These awards were accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

The fair value of the performance shares based on total stockholder return granted during the year ended December 31, 2012 were estimated using the following weighted-average assumptions:

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Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

Vesting of the remaining 23,250 shares of performance-based awards in the table above will be dependent upon the three-year average growth rate of WESCO's net income. These awards are valued based upon the grant-date closing price of WESCO's common stock. These awards were accounted for as awards with performance conditions, accordingly stock-based compensation expense is recognized over the performance period and considers the probability that the performance targets will be achieved.

14. COMMITMENTS AND CONTINGENCIES

Future minimum rental payments required under operating leases, primarily for real property that have noncancelable lease terms in excess of one year as of December 31, 2012, are as follows:

(In thousands)
2013	$	53,463
2014	40,253
2015	35,726
2016	29,147
2017	22,990
Thereafter	53,092

Rental expense for the years ended December 31, 2012, 2011 and 2010 was $50.0 million, $48.0 million and $45.4 million, respectively.

From time to time, a number of lawsuits and claims have been or may be asserted against WESCO relating to the conduct of its business, including routine litigation relating to commercial and employment matters. The outcomes of litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to WESCO. However, management does not believe that the ultimate outcome is likely to have a material adverse effect on WESCO’s financial condition or liquidity, although the resolution in any fiscal quarter of one or more of these matters may have a material adverse effect on WESCO’s results of operations for that period.

As initially reported in our 2008 Annual Report on Form 10-K, WESCO International, Inc. (the “Company”), through its wholly owned subsidiary, WESCO Distribution, Inc., is a defendant in a lawsuit filed in a state court in Indiana in which a customer, ArcelorMittal Indiana Harbor, Inc. (“AIH”), alleges that the Company sold defective products to AIH in 2004 that were supplied to the Company by others.  The lawsuit sought monetary damages in the amount of approximately $50 million.  On February 14, 2013, the jury returned a verdict in favor of AIH and awarded damages in the amount of approximately $36 million. Judgment was entered on the jury's verdict on February 14, 2013. The Company disputes this outcome and intends to appeal the judgment. The judgment amount may increase or decrease based on the outcome of various post-trial proceedings, which cannot be predicted with certainty. The Company has also submitted the claims to its insurance carriers.

15. SEGMENTS AND RELATED INFORMATION

WESCO provides distribution of product and services through its eleven operating segments which have been aggregated as one reportable segment. WESCO has over 250,000 unique product stock keeping units and markets more than 1,000,000 products for customers. There were no material amounts of sales or transfers among geographic areas and no material amounts of export sales.

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WESCO attributes revenues from external customers to individual countries on the basis of the point of sale. The following table sets forth information about WESCO by geographic area:

	Net Sales Year Ended December 31,												Long-Lived Assets December 31,
(In thousands)	2012				2011				2010				2012		2011		2010
United States	$	5,216	79	%	$	4,994,641	82	%	$	4,198,420	83	%	$	144,947	$	131,989	$	117,768
Canada	1,084		17	%	900,551		15	%	682,415		13	%	100,366		24,609		12,446
Mexico	92		1	%	84,871		1	%	51,413		1	%	532		572		641
Subtotal North American Operations	6,392				5,980,063				4,932,248				245,845		157,170		130,855
Other Foreign	187		3	%	145,655		2	%	131,614		3	%	6,049		771		325
Total U.S. and Foreign	$	6,579,301			$	6,125,718			$	5,063,862			$	251,894	$	157,941	$	131,180

The following table sets forth sales information about WESCO’s sales by product category:

Year Ended December 31,	2012	2011	2010
(percentages based on total sales)
General and Industrial Supplies	36%	34%	35%
Wire, Cable and Conduit	17%	18%	18%
Data and Broadband Communications	15%	17%	15%
Power Distribution Equipment	13%	11%	12%
Lighting and Controls	9%	9%	10%
Control, Automation and Motors	10%	11%	10%

16. OTHER FINANCIAL INFORMATION

WESCO International has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution, a 100% owned subsidiary of WESCO International, on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.

Condensed consolidating financial information for WESCO International, WESCO Distribution, Inc. and the non-guarantor subsidiaries is as follows:

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CONDENSED CONSOLIDATING BALANCE SHEETS

	December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	6	$	52,275	$	33,818	$	—		$	86,099
Trade accounts receivable, net	—		—		1,036,235		—			1,036,235
Inventories, net	—		347,008		446,966		—			793,974
Other current assets	—		66,106		119,423		—			185,529
Total curent assets	6		465,389		1,636,442		—			2,101,837
Intercompany receivables, net	—		—		1,077,001		(1,077,001		)	—
Property, buildings and equipment, net	—		58,523		152,200		—			210,723
Intangible assets, net	—		6,153		490,608		—			496,761
Goodwill and other intangibles, net	—		246,125		1,531,672		—			1,777,797
Investments in affiliates and other noncurrent assets	2,443,259		3,607,616		20,997		(6,029,361		)	42,511
Total assets	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629
Accounts payable	$	—	$	401,016	$	305,564	$	—		$	706,580
Short-term debt	—		—		30,136		—			30,136
Other current liabilities	18,419		100,956		151,904		—			271,279
Total current liabilities	18,419		501,972		487,604		—			1,007,995
Intercompany payables, net	671,736		405,265		—		(1,077,001		)	—
Long-term debt	171,213		847,761		676,439		—			1,695,413
Other noncurrent liabilities	28,099		190,294		154,137		—			372,530
Stockholders’ equity	1,553,798		2,438,514		3,590,740		(6,029,361		)	1,553,691
Total liabilities and stockholders’ equity	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,816,069		(1,816,069		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,142		3,415,896		31,745		(5,624,302		)	42,481
Total assets	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		4,809		190,463		—			203,069
Total current liabilities	7,797		428,318		409,731		—			845,846
Intercompany payables, net	668,447		1,147,622		—		(1,816,069		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,345,988		2,214,225		3,409,999		(5,624,302		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452

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CONDENSED CONSOLIDATING STATEMENTS OF INCOME

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,442,714	$	3,265,007		$	(128,420	)	$	6,579,301
Cost of goods sold	—		2,738,941		2,637,334			(128,420		)	5,247,855
Selling, general and administrative expenses	59		593,400		367,555			—			961,014
Depreciation and amortization	—		15,208		22,353			—			37,561
Results of affiliates’ operations	235,467		184,947		—			(420,414		)	—
Interest expense, net	23,163		17,683		6,916			—			47,762
Loss on debt extinguishment	—		3,470		—			—			3,470
Provision for income taxes	10,486		23,493		45,901			—			79,880
Net income (loss)	201,759		235,466		184,948			(420,414		)	201,759
Less: Net loss attributable to noncontrolling interest	—		—		(18		)	—			(18		)
Net income (loss) attributable to WESCO International, Inc.	$	201,759	$	235,466	$	184,966		$	(420,414	)	$	201,777

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,230,753	$	2,998,639		$	(103,674	)	$	6,125,718
Cost of goods sold	—		2,585,978		2,406,845			(103,674		)	4,889,149
Selling, general and administrative expenses	70		546,902		325,011			—			871,983
Depreciation and amortization	—		11,996		19,611			—			31,607
Results of affiliates’ operations	229,621		176,581		—			(406,202		)	—
Interest expense, net	23,990		21,382		8,231			—			53,603
Provision for income taxes	9,321		11,455		62,360			—			83,136
Net income	196,240		229,621		176,581			(406,202		)	196,240
Less: Net loss attributable to noncontrolling interest	—		—		(11		)	—			(11		)
Net income attributable to WESCO International, Inc.	$	196,240	$	229,621	$	176,592		$	(406,202	)	$	196,251

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CONDENSED CONSOLIDATING STATEMENTS OF INCOME (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.			Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,820,855		$	2,318,495	$	(75,488	)	$	5,063,862
Cost of goods sold	—		2,262,038			1,878,875		(75,488		)	4,065,425
Selling, general and administrative expenses	234		518,100			245,249		—			763,583
Depreciation and amortization	—		12,581			11,354		—			23,935
Results of affiliates’ operations	153,107		130,267			—		(283,374		)	—
Interest expense, net	27,565		22,291			7,707		—			57,563
Other income	—		(4,285		)	—		—			(4,285		)
Provision for income taxes	9,831		(12,708		)	45,041		—			42,164
Net income attributable to WESCO International, Inc.	$	115,477	$	153,105		$	130,269	$	(283,374	)	$	115,477

62

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(15,897	)	$	300,932		$	3,149		$	—		$	288,184
Investing activities:
Capital expenditures	—			(18,697		)	(4,387		)	—			(23,084		)
Acquisition payments	—			(142,483		)	(1,146,997		)	—			(1,289,480		)
Advances to subsidiaries and other	—			(1,149,143		)	1,558			1,149,143			1,558
Net cash used in investing activities	—			(1,310,323		)	(1,149,826		)	1,149,143			(1,311,006		)
Financing activities:
Net borrowings (repayments)	13,646			1,039,590			1,163,743			(1,149,143		)	1,067,836
Equity transactions	2,252			—			—			—			2,252
Other	—			(22,336		)	(3,704		)	—			(26,040		)
Net cash provided provided by financing activities	15,898			1,017,254			1,160,039			(1,149,143		)	1,044,048
Effect of exchange rate changes on cash and cash equivalents	—			—			1,004			—			1,004
Net change in cash and cash equivalents	1			7,863			14,366			—			22,230
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—			63,869
Cash and cash equivalents at the end of period	$	6		$	52,275		$	33,818		$	—		$	86,099

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(19,823	)	$	181,348		$	6,008		$	—		$	167,533
Investing activities:
Capital expenditures	—			(28,602		)	(4,745		)	—			(33,347		)
Acquisition payments	—			(7,750		)	(40,343		)	—			(48,093		)
Advances to subsidiaries and other	—			(43,936		)	—			44,033			97
Net cash used in investing activities	—			(80,288		)	(45,088		)	44,033			(81,343		)
Financing activities:
Net borrowings (repayments)	21,840			(105,931		)	44,033			(44,033		)	(84,091		)
Equity transactions	(2,013		)	—			—			—			(2,013		)
Other	—			16,942			(1,746		)	—			15,196
Net cash provided (used) by financing activities	19,827			(88,989		)	42,287			(44,033		)	(70,908		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,990		)	—			(4,990		)
Net change in cash and cash equivalents	4			12,071			(1,783		)	—			10,292
Cash and cash equivalents at the beginning of year	1			32,341			21,235			—			53,577
Cash and cash equivalents at the end of period	$	5		$	44,412		$	19,452		$	—		$	63,869

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CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(96,685	)	$	301,578		$	(77,610	)	$	—		$	127,283
Investing activities:
Capital expenditures	—			(12,903		)	(2,229		)	—			(15,132		)
Acquisition payments	—			(265,397		)	—			—			(265,397		)
Sale of subsidiary	—			40,000			—			—			40,000
Advances to subsidiaries and other	—			16,431			—			3,555			19,986
Net cash used in investing activities	—			(221,869		)	(2,229		)	3,555			(220,543		)
Financing activities:
Net borrowings (repayments)	92,350			(58,894		)	3,555			(3,555		)	33,456
Equity transactions	4,333			—			—			—			4,333
Other	—			(5,398		)	(1,756		)	—			(7,154		)
Net cash provided (used) by financing activities	96,683			(64,292		)	1,799			(3,555		)	30,635
Effect of exchange rate changes on cash and cash equivalents	—			—			3,873			—			3,873
Net change in cash and cash equivalents	(2		)	15,417			(74,167		)	—			(58,752		)
Cash and cash equivalents at the beginning of year	3			16,924			95,402			—			112,329
Cash and cash equivalents at the end of period	$	1		$	32,341		$	21,235		$	—		$	53,577

The Company has revised the condensed consolidating statement of cash flows of WESCO Distribution, Inc. The revised statements present cash paid for acquisitions of $40.3 million for the year ended December 31, 2011 as intercompany loans to Non-Guarantor Subsidiaries. These payments represent acquisitions made by the Non-Guarantor subsidiaries that were funded by WECSO Distribution, Inc.  Such transactions have now been revised to reflect an investing cash outflow and a corresponding intercompany borrowing from WESCO Distribution, Inc as a financing cash inflow in the statement of cash flows of the Non-Guarantor Subsidiaries.  The impact of such revision, which the Company has determined was not material, did not have any impact on the consolidated amounts, nor did it impact the Company's obligations under the 2029 Debentures.  The prior period quarterly condensed consolidating financial statements will be similarly revised as the information is presented in our Form 10-Q filings in fiscal year 2013.

The condensed consolidating financial information was also revised to properly reflect interest expense related to intercompany borrowings in the amount of $4.9 million and $5.5 million for the years ended December 31, 2011 and 2010, respectively.

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17. SELECTED QUARTERLY FINANCIAL DATA (unaudited)

The following table sets forth selected quarterly financial data for the years ended December 31, 2012 and 2011:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2012
Net Sales	$	1,606,018	$	1,672,734	$	1,656,186	$	1,644,363
Cost of goods sold	1,286,268		1,337,062		1,317,432		1,307,093
Income from operations	83,532		96,051		103,032		50,356
Income before income taxes	74,570		84,574		90,378		32,117
Net income	52,940		58,932		63,391		26,496
Net income attributable to WESCO International, Inc.	52,978		58,874		63,415		26,510
Basic earnings per share attributable to WESCO International, Inc.(A)	1.22		1.35		1.45		0.60
Diluted earnings per share attributable to WESCO International, Inc.(B)	1.03		1.15		1.25		0.52
2011
Net Sales	$	1,431,305	$	1,524,515	$	1,580,376	$	1,589,522
Cost of goods sold	1,145,255		1,217,666		1,264,745		1,261,483
Income from operations	64,745		84,996		91,752		91,486
Income before income taxes	52,104		71,065		76,673		79,534
Net income	37,305		50,207		53,890		54,838
Net income attributable to WESCO International, Inc.	37,305		50,207		53,890		54,849
Basic earnings per share attributable to WESCO International, Inc.(A)	0.87		1.16		1.24		1.27
Diluted earnings per share attributable to WESCO International, Inc.(B)	0.74		1.00		1.11		1.12

_________________________

^(A)  Earnings per share (EPS) in each quarter is computed using the weighted average number of shares outstanding during the quarter while EPS for the full year is computed by taking the average of the weighted average number of shares outstanding each quarter. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.

^(B)  Diluted EPS in each quarter is computed using the weighted average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by taking the average of the weighted average number of shares outstanding and common share equivalents each quarter. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures as such term is defined under Rule 13a-15(e) promulgated under the Exchange Act. Based on this evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting as such term is defined in Exchange Act Rule 13a-15(f). Because of its inherent limitations, internal control over financial reporting

65

may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in Internal Control — Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2012. Management has excluded EECOL Electric Corporation (EECOL) and Conney Safety Products (Conney)from its assessment of internal control over financial reporting as of December 31, 2012 because they were acquired by the Company in a purchase business combination during 2012. EECOL and Conney are wholly-owned subsidiaries whose total assets represent $1.4 billion and $144.8 million, respectively, and total revenues of $24.1 million and $39.0 million, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2012.

The effectiveness of the Company’s internal control over financial reporting as of December 31, 2012 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report, which is included herein.

Changes in Internal Control Over Financial Reporting

During the last fiscal quarter of 2012, there were no changes in the Company’s internal control over financial reporting identified in connection with management’s evaluation of the effectiveness of the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

Item 9B. Other Information.

None.

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PART III.

Item 10. Directors, Executive Officers and Corporate Governance.

The information set forth under the captions “Board of Directors” and “Executive Officers” in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders is incorporated herein by reference.

Codes of Business Ethics and Conduct

We have adopted a Code of Business Ethics and Conduct (“Code of Conduct”) that applies to our Directors, officers and employees that is available on our website at www.wesco.com by selecting the “Investors” tab followed by the “Corporate Governance” heading. Any amendment or waiver of the Code of Conduct for our officers or Directors will be disclosed promptly at that location on our website.

We also have adopted a Senior Financial Executive Code of Principles for Senior Executives (“Senior Financial Executive Code”) that applies to our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing these functions. The Senior Financial Executive Code is also available at that same location on our website. We intend to timely disclose any amendment or waiver of the Senior Financial Executive Code on our website and will retain such information on our website as required by applicable SEC rules.

A copy of the Code of Conduct and/or Senior Financial Executive Code may also be obtained upon request by any stockholder, without charge, by writing to us at WESCO International, Inc., 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania 15219, Attention: Corporate Secretary.

The information required by Item 10 that relates to our Directors and executive officers is incorporated by reference from the information appearing under the captions “Corporate Governance”, “Board and Committee Meetings” and “Security Ownership” in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders that is to be filed with the SEC pursuant to the Exchange Act within 120 days of the end of our fiscal year on December 31, 2012.

Item 11. Executive Compensation.

The information set forth under the captions “Compensation Discussion and Analysis” and “Director Compensation” in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The information set forth under the caption “Security Ownership” in our definitive Proxy Statement for our 2012 Annual Meeting of Stockholders is incorporated herein by reference.

The following table provides information as of December 31, 2012 with respect to the shares of our common stock that may be issued under our existing equity compensation plans:

Plan Category	Number of securities to be issued upon exercise of outstanding options, warrants and rights	Weighted average exercise price of outstanding options, warrants and rights		Number of securities remaining available for future issuance under equity compensation plans
Equity compensation plans approved by security holders	3,188,521	$	45.84	2,332,211
Equity compensation plans not approved by security holders	—	—		—
Total	3,188,521	$	45.84	2,332,211

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information set forth under the captions “Transactions with Related Persons” and “Corporate Governance” in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services.

The information set forth under the caption “Independent Registered Public Accounting Firm Fees and Services” in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders is incorporated herein by reference.

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PART IV

Item 15. Exhibits and Financial Statement Schedule.

The financial statements, financial statement schedule and exhibits listed below are filed as part of this annual report:

(a)(1) Financial Statements

The list of financial statements required by this item is set forth in Item 8, “Financial Statements and Supplementary Data,” and is incorporated herein by reference.

(2) Financial Statement Schedule

Schedule II — Valuation and Qualifying Accounts

(b) Exhibits

Exhibit No.		Prior Filing or Sequential Page Number
2.1	Recapitalization Agreement, dated as of March 27, 1998, among Thor Acquisitions L.L.C., WESCO International, Inc. (formerly known as CDW Holding Corporation) and certain security holders of WESCO International, Inc.	Incorporated by reference to Exhibit 2.1 to WESCO’s Registration Statement on Form S-4 (No. 333-43225)
2.2	Membership Interest Purchase Agreement, dated as of November 16, 2010, by and among WESCO Distribution, Inc., WDCH, LP, TVC Communications, L.L.C. and Palisades TVC Holding, L.L.C.	Incorporated by reference to Exhibit 2.1 to WESCO’s Current Report on Form 8-K, dated November 16, 2010
2.3	Share Purchase Agreement, dated as of October 15, 2012, between WDCC Enterprises Inc., the Shareholders party thereto, EECOL Holdings Ltd., Jarich Holdings Ltd., EESA Corp., EESA Holdings Ltd. and EECOL Electric Corp.	Incorporated by reference to Exhibit 2.1 to WESCO's Current Report on Form 8-K, dated October 17, 2012
3.1	Restated Certificate of Incorporation of WESCO International, Inc.	Incorporated by reference to Exhibit 3.1 to WESCO’s Registration Statement on Form S-4 (No. 333-70404)
3.2	Amended and Restated By-laws of WESCO International, Inc., effective as of September 28, 2009.	Incorporated by reference to Exhibit 3.1 to WESCO’s Current Report on Form 8-K, dated September 28, 2009
4.1	Indenture, dated August 27, 2009, by and among WESCO International, Inc., WESCO Distribution, Inc. and The Bank of New York, as Trustee.	Incorporated by reference to Exhibit 4.1 to WESCO’s Current Report on Form 8-K, dated August 27, 2009
4.2	Form of 6.0% Convertible Senior Debenture due 2029.	Included in Exhibit 4.1
10.1	Form of Stock Option Agreement.	Incorporated by reference to Exhibit 10.4 to WESCO’s Registration Statement on Form S-4 (No. 333-43225)
10.2	Form of Amendment to Stock Option Agreement.	Incorporated by reference to Exhibit 10.2 to WESCO’s Current Report on Form 8-K, dated March 2, 2006

68

Exhibit No.	Description of Exhibit	Prior Filing or Sequential Page Number
10.3	Form of Management Stock Option Agreement.	Incorporated by reference to Exhibit 10.2 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended September 30, 1998
10.4	Form of Amendment to Management Stock Option Agreement.	Incorporated by reference to Exhibit 10.6 to WESCO’s Current Report on Form 8-K dated March 2, 2006
10.5	1999 Deferred Compensation Plan for Non-Employee Directors, as amended and restated September 20, 2007.	Incorporated by reference to Exhibit 10.5 to WESCO's Annual Report on Form 10-K for the year ended December 31, 2011
10.6	1999 Long-Term Incentive Plan, as restated effective as of May 21, 2008.	Incorporated by reference to Appendix B to the Proxy Statement for the 2008 Annual Meeting of Stockholders filed on Schedule 14A on April 24, 2008
10.7	Form of Stock Appreciation Rights Agreement for Employees.	Incorporated by reference to Exhibit 10.7 to WESCO's Annual Report on Form 10-K for the year ended December 31, 2011
10.8	Form of Restricted Stock Unit Agreement for Employees.	Incorporated by reference to Exhibit 10.8 to WESCO's Annual Report on Form 10-K for the year ended December 31, 2011
10.9	Form of Stock Appreciation Rights Agreement for Non-Employee Directors.	Incorporated by reference to Exhibit 10.3 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010
10.10	Form of Restricted Stock Unit Agreement for Non-Employee Directors.	Incorporated by reference to Exhibit 10.4 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010
10.11	Lease dated December 13, 2002 between WESCO Distribution, Inc. and WESCO Real Estate IV, LLC.	Incorporated by reference to Exhibit 10.27 to WESCO’s Annual Report on Form 10-K for the year ended December 31, 2002
10.12	Lease Guaranty dated December 13, 2002 by WESCO International, Inc. in favor of WESCO Real Estate IV, LLC.	Incorporated by reference to Exhibit 10.28 to WESCO’s Annual Report on Form 10-K for the year ended December 31, 2002
10.13	Amended and Restated Registration and Participation Agreement, dated as of June 5, 1998, among WESCO International, Inc. and certain security holders of WESCO International, Inc. named therein.	Incorporated by reference to Exhibit 10.19 to WESCO’s Registration Statement on Form S-4 (No. 333-43225)
10.14	Asset Purchase Agreement, dated as of September 11, 1998, among Bruckner Supply Company, Inc. and WESCO Distribution, Inc.	Incorporated by reference to Exhibit 2.01 to WESCO’s Current Report on Form 8-K, dated September 11, 1998

69

Exhibit No.	Description of Exhibit	Prior Filing or Sequential Page Number
10.15	Amendment dated March 29, 2002 to Asset Purchase Agreement, dated as of September 11, 1998, among Bruckner Supply Company, Inc. and WESCO Distribution, Inc.	Incorporated by reference to Exhibit 10.25 to WESCO’s Annual Report on Form 10-K for the year ended December 31, 2002
10.16	Agreement and Plan of Merger, dated August 16, 2005, by and among Carlton-Bates Company, the shareholders of Carlton-Bates Company signatory thereto, the Company Representative (as defined therein), WESCO Distribution, Inc. and C-B WESCO, Inc.	Incorporated by reference to Exhibit 10.3 to WESCO’s Current Report on Form 8-K, dated September 28, 2005
10.17	Agreement and Plan of Merger, dated October 2, 2006, by and among WESCO Distribution, Inc., WESCO Voltage, Inc., Communications Supply Holdings, Inc. and Harvest Partners, LLC, as Shareholders’ Representative.	Incorporated by reference to Exhibit 2.1 to WESCO’s Current Report on Form 8-K, dated November 8, 2006
10.18	Third Amended and Restated Receivables Purchase Agreement, dated as of April 13, 2009, by and among WESCO Receivables Corp., WESCO Distribution, Inc., the Purchasers and Purchaser Agents party thereto and PNC Bank, National Association (as successor to Wachovia Capital Markets, LLC), as Administrator.	Incorporated by reference to Exhibit 10.1 to WESCO’s Current Report on Form 8-K, dated April 13, 2009
10.19	First Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of August 31, 2009.	Incorporated by reference to Exhibit 10.4 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009
10.20	Second Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of September 7, 2010.	Incorporated by reference to Exhibit 10.1 to WESCO’s Current Report on Form 8-K, dated September 7, 2010
10.21	Third Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of December 16, 2010.	Incorporated by reference to Exhibit 10.1 to WESCO’s Current Report on Form 8-K, dated December 16, 2010
10.22	Fourth Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of August 22, 2011.	Incorporated by reference to Exhibit 10.2 to WESCO's Current Report on Form 8-K dated August 24, 2011
10.23	Fifth Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of July 31, 2012.	Filed herewith
10.24	Sixth Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated as of October 9, 2012.	Filed herewith
10.25	Seventh Amendment to the Third Amended and Restated Receivables Purchase Agreement, dated December 11, 2012.	Incorporated by reference to Exhibit 10.1 to WESCO’s Current Report on Form 8-K, dated December 17, 2012
10.26	Amended and Restated Employment Agreement, dated as of September 1, 2009, between WESCO International Inc. and John J. Engel.	Incorporated by reference to Exhibit 10.2 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009

70

Exhibit No.	Description of Exhibit	Prior Filing or Sequential Page Number
10.27	Amended and Restated Employment Agreement, dated as of September 1, 2009, between WESCO International Inc. and Stephen A. Van Oss.	Incorporated by reference to Exhibit 10.3 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009
10.28	Term Sheet, dated January 15, 2010, memorializing terms of employment of Diane Lazzaris by WESCO International, Inc.	Incorporated by reference to Exhibit 10.28 to WESCO’s Annual Report on Form 10-K for the year ended December 31, 2009
10.29	Term Sheet, dated June 18, 2010, memorializing terms of employment of Kimberly Windrow by WESCO International, Inc.	Incorporated by reference to Exhibit 10.1 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010
10.30	Notice of Performance Share Award under the WESCO International, Inc. 1999 Long-Term Incentive Plan	Incorporated by reference to Exhibit 10.1 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012
10.31	Consulting and Separation Agreement, dated February 23, 2012, between WESCO and Richard P. Heyse	Incorporated by reference to Exhibit 10.2 to WESCO’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012
10.32	Term Sheet, dated May 24, 2012, memorializing terms of employment of Kenneth Parks by WESCO International, Inc.	Incorporated by reference to Exhibit 10.1 to WESCO's Quarterly Report on Form 10-Q for the quarter ended June 30, 2012
10.33	Term Loan agreement, dated as of December 12, 2012 among WESCO Distribution, Inc., WDCC Enterprises Inc., WESCO International, Inc., Credit Suisse AG, Cayman Island Branch, as Administrative Agent and Collateral Agent and the other Lenders and Agents party thereto	Incorporated by reference to Exhibit 10.1 to WESCO's Current Report on Form 8-K, dated December 17, 2012
21.1	Subsidiaries of WESCO.	Filed herewith
23.1	Consent of PricewaterhouseCoopers LLP.	Filed herewith
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) promulgated under the Exchange Act.	Filed herewith
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) promulgated under the Exchange Act.	Filed herewith
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	Filed herewith
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	Filed herewith
101	Interactive Data File*	Filed herewith

________________________

* In with accordance with Rule 406T of Regulation S-T promulgated by the Securities and Exchange Commission, Exhibit 101 is deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

The registrant hereby agrees to furnish supplementally to the Commission, upon request, a copy of any omitted schedule to any of the agreements contained herein.

Copies of exhibits may be retrieved electronically at the Securities and Exchange Commission’s home page at www.sec.gov. Exhibits will also be furnished without charge by writing to Kenneth S. Parks, Vice President and Chief Financial Officer, 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania 15219. Requests may also be directed to (412) 454-2200.

71

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

WESCO INTERNATIONAL, INC.
By:	/s/ JOHN J. ENGEL
	Name:	John J. Engel
	Title:	Chairman, President and Chief Executive Officer
	Date:	February 28, 2013

WESCO INTERNATIONAL, INC.
By:	/s/ KENNETH S. PARKS
	Name:	Kenneth S. Parks
	Title:	Vice President and Chief Financial Officer
	Date:	February 28, 2013

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

72

Signature	Title	Date
/s/ JOHN J. ENGEL	Chairman, President and Chief Executive Officer	February 28, 2013
John J. Engel	(Principal Executive Officer)
/s/ KENNETH S. PARKS	Vice President and Chief Financial Officer	February 28, 2013
Kenneth S. Parks	(Principal Financial and Accounting Officer)
/s/ SANDRA BEACH LIN	Director	February 28, 2013
Sandra Beach Lin
/s/ GEORGE L. MILES, JR.	Director	February 28, 2013
George L. Miles, Jr.
/s/ JOHN K. MORGAN	Director	February 28, 2013
John K. Morgan
/s/ STEPHEN A. RAYMUND	Director	February 28, 2013
Steven A. Raymund
/s/ JAMES L. SINGLETON	Director	February 28, 2013
James L. Singleton
/s/ ROBERT J. TARR, JR.	Director	February 28, 2013
Robert J. Tarr, Jr.
/s/ LYNN M. UTTER	Director	February 28, 2013
Lynn M. Utter
/s/ STEPHEN A. VAN OSS	Director	February 28, 2013
Stephen A. Van Oss
/s/ WILLIAM J. VARESCHI	Director	February 28, 2013
William J. Vareschi

73

Schedule II—Valuation and Qualifying Accounts

	(In thousands)
	Balance at Beginning		Charged to		Charged to Other					Balance at
(In thousands)	of Period		Expense		Accounts		Deductions(1)			End of Period
Allowance for doubtful accounts
Year ended December 31, 2012	$	21,590	$	1,119	$	—	$	(5,467	)	$	17,242
Year ended December 31, 2011	18,562		6,583		—		(3,555		)	21,590
Year ended December 31, 2010	20,060		6,439		—		(7,937		)	18,562

_________________________

⁽¹⁾  Includes a reduction in the allowance for doubtful accounts due to write-off of accounts receivable.

74

EX-10.23

EXECUTION COPY

FIFTH AMENDMENT TO THIRD AMENDED AND RESTATED

RECEIVABLES PURCHASE AGREEMENT

THIS FIFTH AMENDMENT TO THIRD AMENDED AND RESTATED RECEIVABLES PURCHASE AGREEMENT (this “Amendment”), dated as of July 31, 2012, is entered into among WESCO RECEIVABLES CORP. (the “Seller”), WESCO DISTRIBUTION, INC. (“WESCO” or the “Servicer”), the Purchasers (each, a “Purchaser”) and Purchaser Agents (each, a “Purchaser Agent”) party hereto, and PNC BANK, NATIONAL ASSOCIATION, as Administrator (the “Administrator”).

RECITALS

1.The Seller, the Servicer, each Purchaser, each Purchaser Agent and the Administrator are parties to the Third Amended and Restated Receivables Purchase Agreement, dated as of April 13, 2009 (as amended through the date hereof, the “Agreement”).

2.The parties hereto desire to amend the Agreement as hereinafter set forth.

NOW THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

1.Certain Defined Terms. Capitalized terms that are used herein without definition and that are defined in Exhibit I to the Agreement shall have the same meanings herein as therein defined.

2.Amendment to the Agreement. The definition of “Excluded Receivable” set forth on Exhibit I to the Agreement is hereby replaced in its entirety with the following:

“Excluded Receivable” means any Receivable (without giving effect to the exclusion of “Excluded Receivables” from the definition thereof) (i) owed by an Obligor not a resident of the United States and denominated in a currency other than U.S. dollars, (ii) originated by the Tampa Major Projects Branch, identified on WESCO’s system as Branch No. 3840, (iii) originated by Communications Supply Corporation, the Obligor of which is The Stanley Works Co. or (iv) originated by an Originator at any time after July 31, 2012, the Obligor of which is Siemens AG or any Subsidiary thereof.

3.Representations and Warranties. The Seller and the Servicer hereby represent and warrant to each of the parties hereto as follows:

(a)Representations and Warranties. The representations and warranties contained in Exhibit III of the Agreement are true and correct as of the date hereof.

702734011 99551574

(b)No Default. Both before and immediately after giving effect to this Amendment and the transactions contemplated hereby, no Termination Event or Unmatured Termination Event exists or shall exist.

4.Effect of Amendment. All provisions of the Agreement, as expressly amended and modified by this Amendment shall remain in full force and effect. As of and after the Effective Time, all references in the Agreement (or in any other Transaction Document) to “this Agreement”, “hereof”, “herein” or words of similar effect referring to the Agreement shall be deemed to be references to the Agreement as amended by this Amendment. This Amendment shall not be deemed, either expressly or impliedly, to waive, amend or supplement any provision of the Agreement other than as set forth herein.

5.Effectiveness. This Amendment shall become effective as of the time (the “Effective Time”) at which the Administrator has executed this Amendment and receives each of the following: (A) counterparts of this Amendment (whether by facsimile or otherwise) executed by each of the other parties hereto, in form and substance satisfactory to the Administrator in its sole discretion and (B) such other agreements, documents and instruments as the Administrator may request.

6.Counterparts. This Amendment may be executed in any number of counterparts and by different parties on separate counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute but one and the same instrument.

7.Governing Law; Jurisdiction.

7.1THIS AMENDMENT SHALL BE A CONTRACT MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK).

7.2ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS AMENDMENT MAY BE BROUGHT IN THE COURTS OF THE STATE OF NEW YORK OR OF THE UNITED STATES FOR THE SOUTHERN DISTRICT OF NEW YORK; AND, BY EXECUTION AND DELIVERY OF THIS AMENDMENT, EACH OF THE PARTIES HERETO CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO THE NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES, TO THE MAXIMUM EXTENT PERMITTED BY LAW, ANY OBJECTION, INCLUDING ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS, THAT IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING IN SUCH JURISDICTION IN RESPECT OF THIS AMENDMENT OR ANY DOCUMENT RELATED HERETO. EACH OF THE PARTIES HERETO WAIVES PERSONAL SERVICE OF ANY SUMMONS, COMPLAINT OR OTHER PROCESS, WHICH SERVICE MAY BE MADE BY ANY OTHER MEANS PERMITTED BY NEW YORK LAW.

702734011 99551574

8.Section Headings. The various headings of this Amendment are included for convenience only and shall not affect the meaning or interpretation of this Amendment, the Agreement or any provision hereof or thereof.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

702734011 99551574

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first written above.

WESCO RECEIVABLES CORP.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

WESCO DISTRIBUTION, INC.,
as Servicer

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

PNC BANK, NATIONAL ASSOCIATION,

as Administrator

By:     /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE CONDUIT PURCHASERS AND THE PURCHASER AGENTS:

MARKET STREET FUNDING LLC,

as a Conduit Purchaser

By:    /s/ Doris J. Hearn

Name:    Doris J. Hearn

Title:    Vice President

PNC BANK, NATIONAL ASSOCIATION,

as Purchaser Agent for Market Street Funding LLC

By:     /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

WELLS FARGO BANK, NATIONAL ASSOCIATION, as a Conduit Purchaser

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

WELLS FARGO BANK, NATIONAL ASSOCIATION, as Purchaser Agent for

Wells Fargo Bank, National Association

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

FIFTH THIRD BANK,
as a Conduit Purchaser

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

FIFTH THIRD BANK,

as Purchaser Agent for Fifth Third Bank

By:    /s/ Mike Mendenhall

Name:    Mike Mendenhall

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

U.S. BANK NATIONAL ASSOCIATION, as a Conduit Purchaser

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

U.S. BANK NATIONAL ASSOCIATION,

as Purchaser Agent for U.S. Bank National Association

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE PRIVATEBANK AND TRUST COMPANY, as a Conduit Purchaser

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

THE PRIVATEBANK AND TRUST COMPANY, as Purchaser Agent for The PrivateBank and Trust Company

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE HUNTINGTON NATIONAL BANK, as a Conduit Purchaser

By:    /s/ W. Christopher Kohler

Name:    W. Christopher Kohler

Title:    Senior Vice President

THE HUNTINGTON NATIONAL BANK,

as Purchaser Agent for The Huntington National Bank

By:    /s/ W. Christopher Kohler

Name:    W. Christopher Kohler

Title:    Senior Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE RELATED COMMITTED PURCHASERS:

PNC BANK, NATIONAL ASSOCIATION,

as a Related Committed Purchaser for Market Street

Funding LLC

By:     /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

FIFTH THIRD BANK,
as a Related Committed Purchaser for Fifth Third Bank

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

WELLS FARGO BANK, NATIONAL ASSOCIATION, as a Related Committed Purchaser for Wells Fargo Bank, National Association

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

U.S. BANK NATIONAL ASSOCIATION,
as a Related Committed Purchaser for U.S. Bank National Association

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE PRIVATEBANK AND TRUST COMPANY, as a Related Committed Purchaser

for The PrivateBank and Trust Company

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

THE HUNTINGTON NATIONAL BANK,
as a Related Committed Purchaser

for The Huntington National Bank

By:    /s/ Chad A. Lowe

Name:    Chad A. Lowe

Title:    Vice President

FIFTH AMENDMENT

TO WESCO 3^RD A&R RPA

702734011 99551574

EX-10.24

EXECUTION COPY

SIXTH AMENDMENT TO THIRD AMENDED AND RESTATED

RECEIVABLES PURCHASE AGREEMENT

THIS SIXTH AMENDMENT TO THIRD AMENDED AND RESTATED RECEIVABLES PURCHASE AGREEMENT (this “Amendment”), dated as of October 9, 2012, is entered into among WESCO RECEIVABLES CORP. (the “Seller”), WESCO DISTRIBUTION, INC. (“WESCO” or the “Servicer”), the Purchasers (each, a “Purchaser”) and Purchaser Agents (each, a “Purchaser Agent”) party hereto, and PNC BANK, NATIONAL ASSOCIATION, as Administrator (the “Administrator”).

RECITALS

1.The Seller, the Servicer, each Purchaser, each Purchaser Agent and the Administrator are parties to the Third Amended and Restated Receivables Purchase Agreement, dated as of April 13, 2009 (as amended through the date hereof, the “Agreement”).

2.Concurrently herewith, the Seller, the Servicer and the Originators are entering into that certain Ninth Amendment to Purchase and Sale Agreement (the “Purchase and Sale Agreement Amendment”), dated as of the date hereof.

3.Concurrently herewith, the Seller, the Servicer, the Originators, the Administrator and JPMorgan are entering into that certain Joinder Agreement (the “Intercreditor Joinder”), dated as of the date hereof.

4.The parties hereto desire to amend the Agreement as hereinafter set forth.

NOW THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

1.Certain Defined Terms. Capitalized terms that are used herein without definition and that are defined in Exhibit I to the Agreement shall have the same meanings herein as therein defined.

2.Consents.

(a)Each of the parties hereto hereby consents to the execution, delivery and performance of the Intercreditor Joinder, a copy of which is attached hereto as Exhibit A. On and after the date hereof, each reference in the Agreement to the “Intercreditor Agreement” shall be deemed to be a reference to the Intercreditor Agreement as amended by the Intercreditor Joinder.

(b)Each of the parties hereto hereby consents to the execution, delivery and performance of the Purchase and Sale Agreement Amendment, a copy of which is attached

703255274 99551574

hereto as Exhibit B. On and after the date hereof, each reference in the Agreement to “Sale Agreement” shall be deemed to be a reference to the Sale Agreement as amended by the Purchase and Sale Agreement Amendment.

3.Representations and Warranties. The Seller and the Servicer hereby represent and warrant to each of the parties hereto as follows:

(a)Representations and Warranties. The representations and warranties contained in Exhibit III of the Agreement are true and correct as of the date hereof.

(b)No Default. Both before and immediately after giving effect to this Amendment and the transactions contemplated hereby, no Termination Event or Unmatured Termination Event exists or shall exist.

4.Effect of Amendment. All provisions of the Agreement, as expressly amended and modified by this Amendment shall remain in full force and effect. As of and after the Effective Time, all references in the Agreement (or in any other Transaction Document) to “this Agreement”, “hereof”, “herein” or words of similar effect referring to the Agreement shall be deemed to be references to the Agreement as amended by this Amendment. This Amendment shall not be deemed, either expressly or impliedly, to waive, amend or supplement any provision of the Agreement other than as set forth herein.

5.Effectiveness. This Amendment shall become effective as of the time (the “Effective Time”) at which the Administrator has executed this Amendment and receives each of the following: (A) counterparts of this Amendment (whether by facsimile or otherwise) executed by each of the other parties hereto, in form and substance satisfactory to the Administrator in its sole discretion, (B) counterparts of the Purchase and Sale Agreement Amendment (whether by facsimile or otherwise) executed by each of the parties thereto, in form and substance satisfactory to the Administrator in its sole discretion, (C) counterparts of the Intercreditor Joinder (whether by facsimile or otherwise) executed by each of the parties thereto, in form and substance reasonably satisfactory to the Administrator, (D) favorable opinions, in form and substance reasonably satisfactory to the Administrator and each Purchaser Agent, of K&L Gates LLP, counsel for Seller and the Originators, as to certain UCC, bankruptcy and general corporate and enforceability matters (including certain conflicts matters) and (E) such other agreements, documents, instruments and opinions as the Administrator may request.

6.Counterparts. This Amendment may be executed in any number of counterparts and by different parties on separate counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute but one and the same instrument.

7.Governing Law; Jurisdiction.

7.1THIS AMENDMENT SHALL BE A CONTRACT MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK

703255274 99551574

(INCLUDING FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK).

7.2ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS AMENDMENT MAY BE BROUGHT IN THE COURTS OF THE STATE OF NEW YORK OR OF THE UNITED STATES FOR THE SOUTHERN DISTRICT OF NEW YORK; AND, BY EXECUTION AND DELIVERY OF THIS AMENDMENT, EACH OF THE PARTIES HERETO CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO THE NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES, TO THE MAXIMUM EXTENT PERMITTED BY LAW, ANY OBJECTION, INCLUDING ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS, THAT IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING IN SUCH JURISDICTION IN RESPECT OF THIS AMENDMENT OR ANY DOCUMENT RELATED HERETO. EACH OF THE PARTIES HERETO WAIVES PERSONAL SERVICE OF ANY SUMMONS, COMPLAINT OR OTHER PROCESS, WHICH SERVICE MAY BE MADE BY ANY OTHER MEANS PERMITTED BY NEW YORK LAW.

8.Section Headings. The various headings of this Amendment are included for convenience only and shall not affect the meaning or interpretation of this Amendment, the Agreement or any provision hereof or thereof.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

703255274 99551574

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first written above.

WESCO RECEIVABLES CORP.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

WESCO DISTRIBUTION, INC.,
as Servicer

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

PNC BANK, NATIONAL ASSOCIATION,

as Administrator

By:     /s/ William Falcon

Name:    William Falcon

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE CONDUIT PURCHASERS AND THE PURCHASER AGENTS:

MARKET STREET FUNDING LLC,

as a Conduit Purchaser

By:    /s/ Doris J. Hearn

Name:    Doris J. Hearn

Title:    Vice President

PNC BANK, NATIONAL ASSOCIATION,

as Purchaser Agent for Market Street Funding LLC

By:     /s/ William Falcon

Name:    William Falcon

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

WELLS FARGO BANK, NATIONAL ASSOCIATION, as a Conduit Purchaser

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

WELLS FARGO BANK, NATIONAL ASSOCIATION, as Purchaser Agent for

Wells Fargo Bank, National Association

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

FIFTH THIRD BANK,
as a Conduit Purchaser

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

FIFTH THIRD BANK,

as Purchaser Agent for Fifth Third Bank

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

U.S. BANK NATIONAL ASSOCIATION, as a Conduit Purchaser

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

U.S. BANK NATIONAL ASSOCIATION,

as Purchaser Agent for U.S. Bank National Association

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE PRIVATEBANK AND TRUST COMPANY, as a Conduit Purchaser

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

THE PRIVATEBANK AND TRUST COMPANY, as Purchaser Agent for The PrivateBank and Trust Company

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE HUNTINGTON NATIONAL BANK, as a Conduit Purchaser

By:    /s/ Chad A. Lowe

Name:    Chad A. Lowe

Title:    Vice President

THE HUNTINGTON NATIONAL BANK,

as Purchaser Agent for The Huntington National Bank

By:    /s/ Chad A. Lowe

Name:    Chad A. Lowe

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE RELATED COMMITTED PURCHASERS:

PNC BANK, NATIONAL ASSOCIATION,

as a Related Committed Purchaser for Market Street

Funding LLC

By:    /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

FIFTH THIRD BANK,
as a Related Committed Purchaser for Fifth Third Bank

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

WELLS FARGO BANK, NATIONAL ASSOCIATION, as a Related Committed Purchaser for Wells Fargo Bank, National Association

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

U.S. BANK NATIONAL ASSOCIATION,
as a Related Committed Purchaser for U.S. Bank National Association

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE PRIVATEBANK AND TRUST COMPANY, as a Related Committed Purchaser

for The PrivateBank and Trust Company

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

THE HUNTINGTON NATIONAL BANK,
as a Related Committed Purchaser

for The Huntington National Bank

By:    /s/ Chad A. Lowe

Name:    Chad A. Lowe

Title:    Vice President

SIXTH AMENDMENT

TO WESCO 3^RD A&R RPA

703255274 99551574

EXHIBIT A

Intercreditor Joinder

(attached)

JOINDER AGREEMENT

THIS JOINDER AGREEMENT, dated as of October 9, 2012 (this “Agreement”) is executed by and among PNC BANK, NATIONAL ASSOCIATION, in its capacity as Administrator under the Receivables Purchase Agreement (the “Receivables Agent”), JPMORGAN CHASE BANK, N.A., in its capacity as Agent, for itself and on behalf of the Lenders (the “Lenders Agent”), WESCO RECEIVABLES CORP. (the “Receivables Seller”), WESCO DISTRIBUTION, INC. (“WESCO”), WESCO EQUITY CORPORATION, CARLTON-BATES COMPANY, COMMUNICATIONS SUPPLY CORPORATION, LIBERTY WIRE & CABLE, INC., CALVERT WIRE & CABLE CORPORATION, BRUCKNER SUPPLY COMPANY, INC., TVC COMMUNICATIONS, L.L.C. and CONNEY SAFETY PRODUCTS, LLC (“Conney”).

BACKGROUND:

A.    Each of the parties hereto (other than Conney) is a party to that certain Intercreditor Agreement, dated as of August 22, 2011 (as amended, restated, supplemented or otherwise modified from time to time, the “Intercreditor Agreement”).

B.    Concurrently herewith, Conney is being added as a party to the Receivables Purchase and Sale Agreement, pursuant to that certain Ninth Amendment to Purchase and Sale Agreement, dated as of the date hereof, among WESCO, the Receivables Seller, Conney and certain of WESCO’s domestic subsidiaries and affiliates.

C.    Conney was added to the Credit Agreement as a Loan Party effective September 11, 2012.

D.    The parties hereto desire to amend the Intercreditor Agreement as set forth herein to join Conney as a new party thereto.

NOW, THEREFORE, in consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each of the parties hereto hereby agrees as follows:

SECTION 1.Definitions. Capitalized terms used in this Agreement and not otherwise defined herein shall have the meanings assigned thereto in, or by reference in, the Intercreditor Agreement.

SECTION 2.Joinder of Conney.

(a)Conney hereby agrees that it shall be bound by all of the terms, conditions and provisions of, and shall be deemed to be a party to (as if it were an original signatory to), the

703255274 99551574

EXECUTION COPY

Intercreditor Agreement in the capacity of an Originator and a Loan Party thereunder. Conney hereby acknowledges that it has received a copy of the Intercreditor Agreement.

(b)Conney’s address for notices under the Intercreditor Agreement shall be the following:

Conney Safety Products, LLC

c/o WESCO Distribution, Inc.

225 West Station Square Drive

Suite 700

Pittsburgh, PA 15219

(c)Each of the parties hereto hereby consents to the joinder of Conney as a party to the Intercreditor Agreement, as set forth above. To the extent that any consent of any party hereto is required under any other agreement to which it is a party for any of the transactions to be effected hereby, such party hereby grants such consent and waives any notice requirements or condition precedent to the effectiveness of any such transactions set forth in any agreement to which it is a party that has not been satisfied as of the date hereof.

SECTION 3.GOVERNING LAW; JURISDICTION. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK. EACH PARTY HERETO HEREBY CONSENTS AND AGREES THAT THE STATE OR FEDERAL COURTS LOCATED IN NEW YORK COUNTY, CITY OF NEW YORK, NEW YORK SHALL HAVE EXCLUSIVE JURISDICTION TO HEAR AND DETERMINE ANY CLAIMS OR DISPUTES BETWEEN THE PARTIES HERETO PERTAINING TO THIS AGREEMENT OR TO ANY MATTER ARISING OUT OF OR RELATING TO THIS AGREEMENT.

SECTION 4.WAIVER OF JURY TRIAL. BECAUSE DISPUTES ARISING IN CONNECTION WITH COMPLEX FINANCIAL TRANSACTIONS ARE MOST QUICKLY AND ECONOMICALLY RESOLVED BY AN EXPERIENCED AND EXPERT PERSON AND THE PARTIES WISH APPLICABLE STATE AND FEDERAL LAWS TO APPLY (RATHER THAN ARBITRATION RULES), THE PARTIES DESIRE THAT THEIR DISPUTES BE RESOLVED BY A JUDGE APPLYING SUCH APPLICABLE LAWS. THEREFORE, TO ACHIEVE THE BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF ARBITRATION, THE PARTIES HERETO WAIVE ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, SUIT, OR PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE, WHETHER SOUNDING IN CONTRACT, TORT OR OTHERWISE, AMONG THE PARTIES HERETO ARISING OUT OF, CONNECTED WITH, RELATED TO, OR INCIDENTAL TO THE RELATIONSHIP ESTABLISHED AMONG THEM IN CONNECTION WITH, THIS AGREEMENT OR THE TRANSACTIONS RELATED THERETO.

SECTION 5.Execution in Counterparts. This Agreement may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute

702734089 99551574

one and the same agreement. Delivery of an executed signature page by electronic mail or facsimile shall be as effective as delivery of a manually signed, original signature page.

[Signature Pages Follow]

IN WITNESS WHEREOF, the undersigned has caused this Agreement to be executed by its duly authorized officer as of the date and year first above written.

PNC BANK, NATIONAL ASSOCIATION,

as Receivables Agent

By:    /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

702734089 99551574

EXECUTION COPY

JPMORGAN CHASE BANK, N.A.,

as Lenders Agent

By:    /s/ David J. Waugh

Name:    David J. Waugh

Title:    Authorized Officer

702709277 99551574

WESCO RECEIVABLES CORP.,

as Receivables Seller

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

WESCO DISTRIBUTION, INC.,

as Seller, as Servicer and as Borrower

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

WESCO EQUITY CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

CARLTON-BATES COMPANY

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

COMMUNICATIONS SUPPLY CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574

LIBERTY WIRE & CABLE, INC.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

CALVERT WIRE & CABLE CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

BRUCKNER SUPPLY COMPANY, INC.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

TVC COMMUNICATIONS, L.L.C.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

CONNEY SAFETY PRODUCTS, LLC

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574

EXHIBIT B

Purchase and Sale Agreement Amendment

(attached)

702709277 99551574

NINTH AMENDMENT TO PURCHASE

AND SALE AGREEMENT

THIS NINTH AMENDMENT TO PURCHASE AND SALE AGREEMENT, dated as of October 9, 2012 (this “Amendment”), is entered into among the Originators (the “Originators”) party to the Purchase and Sale Agreement, dated as of June 30, 1999 (as amended through the date hereof, the “Agreement”), WESCO RECEIVABLES CORP. (the “Company”), WESCO DISTRIBUTION, INC. (“WESCO”), individually and as Servicer (in such capacity, the “Servicer”), and CONNEY SAFETY PRODUCTS, LLC (“Conney”) (Conney is also referred to herein as the “New Originator”).

RECITALS

1. The Originators currently party to the Agreement (the “Existing Originators”), the Company and the Servicer are parties to the Agreement; and

2. The parties hereto desire to amend the Agreement as hereinafter set forth.

NOW THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

1. Certain Defined Terms. Capitalized terms that are used herein without definition shall have the meanings set forth in the Agreement or Exhibit I to the Third Amended and Restated Receivables Purchase Agreement, dated as of April 13, 2009 (as amended through the date hereof, the “Receivables Purchase Agreement”), among the Company, the Servicer, PNC Bank, National Association, as Administrator, and the various Purchaser Groups from time to time party thereto, as applicable.

2. Amendments to the Agreement. The Agreement is hereby amended as follows:

2.1.     The first paragraph of the Preamble is hereby amended in its entirety to read as follows:

THIS PURCHASE AND SALE AGREEMENT (this “Agreement”), dated as of June 30, 1999, is among WESCO DISTRIBUTION, INC., a Delaware corporation (“WESCO”), individually and as Servicer (in such capacity, the “Servicer”), WESCO EQUITY CORPORATION, a Delaware corporation (“Equity”), CARLTON-BATES COMPANY, an Arkansas corporation (“Carlton-Bates”), COMMUNICATIONS SUPPLY CORPORATION, a Connecticut Corporation (“CSC”), LIBERTY WIRE & CABLE, INC., a Delaware corporation (“Liberty”), CALVERT WIRE & CABLE CORPORATION, a Delaware corporation (“Calvert”), BRUCKNER SUPPLY COMPANY, INC., a Delaware corporation (“Bruckner”), TVC COMMUNICATIONS, L.L.C., a Delaware limited

702709277 99551574

liability company (“TVC”), and CONNEY SAFETY PRODUCTS, LLC (“Conney”), a Delaware limited liability company (WESCO, Equity, Carlton-Bates, CSC, Liberty, Calvert, Bruckner, TVC and Conney are herein collectively called the “Originators” and each individually called an “Originator”) and WESCO RECEIVABLES CORP., a Delaware corporation (the “Company”).

2.2.    Exhibit E to the Agreement is hereby amended by inserting the following at the end thereof:

Conney Safety Products, LLC

c/o WESCO Distribution, Inc.

225 West Station Square Drive

Suite 700

Pittsburgh, PA 15219

2.3.    Exhibit F to the Agreement is hereby amended and restated in its entirety as set forth on Exhibit A hereto.

2.4.    With respect to the New Originator, any reference in the Agreement to “the Initial Closing Date” or “the date hereof” shall be deemed to be a reference to “October 9, 2012”.

2.5.    With respect to the New Originator, any reference in the Agreement to the “Cut-off Date” shall be deemed to be a reference to “October 9, 2012”.

2.6.    With respect to the New Originator, the reference in Section 5.9(a) of the Agreement to “December 31, 1998” shall be deemed to be a reference to “December 31, 2011”.

3. Joinder. The New Originator hereby agrees that it shall be bound by all of the terms, conditions and provisions of, and shall be deemed to be a party to (as if it were an original signatory to), the Agreement. For greater certainty, the New Originator hereby acknowledges that pursuant to Section 1.5 of the Agreement, it has granted and hereby grants a security interest in all of its right, title and interest in and to the Receivables and the Related Rights now existing and hereafter created by it, all monies due or to become due and all amounts received with respect thereto, and all proceeds thereof, to secure all of its obligations under the Agreement. The New Originator further acknowledges that it has received copies of the Agreement, the Intercreditor Agreement and the other Transaction Documents.

4. Representations and Warranties. (i) Each Existing Originator and the New Originator represents and warrants on and as of the date hereof and on the date the conditions set forth in Section 5 hereof are satisfied, the representations and warranties made by such Originator in Article V of the Agreement, as amended hereby, shall be true and correct on and as of such dates with the same force and effect as if made on and as of such dates and as if each reference to the Agreement in such representations and warranties referred to the Agreement as amended by this Amendment

702709277 99551574

and (ii) the Company and the Servicer represent and warrant on and as of the date hereof and on the date the conditions set forth in Section 5 hereof are satisfied, that (A) the representations and warranties contained in Exhibit III of the Receivables Purchase Agreement are true and correct and (B) both before and immediately after giving effect to this Amendment and the transactions contemplated hereby, no Termination Event or Unmatured Termination Event exists or shall exist.

5. Conditions To Effectiveness. This Amendment shall become effective as of the date hereof upon receipt by the Seller, the Servicer, the Administrator and each Purchaser Agent of each of the following, in each case in form and substance satisfactory to the Administrator: (i) counterparts of this Amendment, duly executed by all of the parties hereto, (ii) each document, agreement, instrument and opinion listed in Section 4.1 of the Agreement, in each case with respect to the New Originator and (iii) such other instruments, opinions and documents as the Administrator may request.

6. Ratification. All of the provisions of this Amendment are incorporated by reference into the Agreement, as if set forth in full therein. The Agreement, as amended hereby, remains in full force and effect. Any reference to the Agreement from and after the date hereof shall be deemed to refer to the Agreement, amended hereby. As amended, the Agreement is hereby ratified and reaffirmed by the parties hereto.

7. Counterparts. This Amendment may be executed in any number of counterparts and by the different parties hereto on separate counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute one and the same agreement.

8. Governing Law; Jurisdiction.

8.1 THIS AMENDMENT SHALL BE A CONTRACT MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK).

8.2 ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS AMENDMENT MAY BE BROUGHT IN THE COURTS OF THE STATE OF NEW YORK OR OF THE UNITED STATES FOR THE SOUTHERN DISTRICT OF NEW YORK; AND, BY EXECUTION AND DELIVERY OF THIS AMENDMENT, EACH OF THE PARTIES HERETO CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO THE NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES, TO THE MAXIMUM EXTENT PERMITTED BY LAW, ANY OBJECTION, INCLUDING ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS, THAT IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING IN SUCH JURISDICTION IN RESPECT OF THIS AMENDMENT OR ANY DOCUMENT RELATED HERETO. EACH OF THE PARTIES HERETO WAIVES PERSONAL SERVICE OF ANY SUMMONS, COMPLAINT OR OTHER PROCESS, WHICH SERVICE MAY BE MADE BY ANY OTHER MEANS PERMITTED BY NEW YORK LAW.

702709277 99551574

9. Section Headings. The various headings of this Amendment are included for convenience only and shall not affect the meaning or interpretation of this Amendment, the Agreement or any provision hereof or thereof.

(Signatures begin on following page)

702709277 99551574

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

WESCO RECEIVABLES CORP.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

WESCO DISTRIBUTION, INC.,

individually and as Servicer

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

WESCO EQUITY CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

CARLTON-BATES COMPANY

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

COMMUNICATIONS SUPPLY CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

LIBERTY WIRE & CABLE, INC.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

CALVERT WIRE & CABLE CORPORATION

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

BRUCKNER SUPPLY COMPANY, INC.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

TVC COMMUNICATIONS, L.L.C.

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

CONNEY SAFETY PRODUCTS, LLC

By:    /s/ Brian M. Begg

Name:    Brian M. Begg

Title:    Treasurer

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

PNC BANK, NATIONAL ASSOCIATION

By:    /s/ Mark Falcione

Name:    Mark Falcione

Title:    Senior Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

MARKET STREET FUNDING LLC

By:    /s/ Doris J. Hearn

Name:    Doris J. Hearn

Title:    Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

U.S. BANK NATIONAL ASSOCIATION

By:    /s/ Matthew Kasper

Name:    Matthew Kasper

Title:    Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

WELLS FARGO BANK, NATIONAL ASSOCIATION

By:    /s/ William P. Rutkowski

Name:    William P. Rutkowski

Title:    Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

FIFTH THIRD BANK

By:    /s/ Andrew D. Jones

Name:    Andrew D. Jones

Title:    Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

THE PRIVATEBANK AND TRUST COMPANY

By:    /s/ Chandra Pierson

Name:    Chandra Pierson

Title:    Associate Managing Director

702709277 99551574 Ninth Amendment to
WESCO PSA

CONSENTED TO AND AGREED:

THE HUNTINGTON NATIONAL BANK

By:    /s/ Chad A. Lowe

Name:    Chad A. Lowe

Title:    Vice President

702709277 99551574 Ninth Amendment to
WESCO PSA

Exhibit B-1

703255274 99551574

EXHIBIT A

EXHIBIT F

TRADE NAMES

Trade Names

Ace Electric Supply Company

Allied Utility Products

Ambord Corporation d/b/a Maydwell & Hartzell

Avon Electrical Supplies

Brown Wholesale Electric Company

Bruckner Supply Company

Carlton-Bates

Control Corporation of America

Diversified Electric Supply Company

EESCO

Electra Supply Company

Englewood Electric

Fastec

Hamby-Young Power Supply Products

Herning Underground Supply

Industrial Electric Supply Co.

KVA

Ladd Industries, Inc.

LCOMP, Inc.

Liberty Electrical Supply Co.

M & Associates

Maydwell & Hartzell

Modern Wholesale Electric

Motion Control

Murco, Incorporated

Nevada Electrical Supply Company

Orton Utility Supply

Power Supply

Reily Electrical Supply

Standard Electric Company

Statewide Electrical Supply

Tri-City Electric Supply Co.

WESCO SPS

Whitehill Lighting & Supplies

W.R. Control Panels

Exhibit B-1

703255274 99551574

Communications Supply Holdings, Inc.

Communications Supply Corporation

CSC

Liberty Wire & Cable, Inc.

CSC-Fibertron

Calvert Wire & Cable Corporation

Famous Telephone Supply Co.

Enhance ^(it) 

TVC

TVC Latin America

TVC Caribbean and Latin America

Vikimatic Sales

White Sands

Satellite Engineering

TVC Communications, LLC

Vikimatic

White Sands Engineering

Satellite Engineering Group

Conney Safety

Merger

On September 29, 2005, C-B WESCO, Inc., a subsidiary of WESCO Distribution, Inc., was merged with and into Carlton-Bates Company, an Arkansas corporation, with Carlton-Bates Company being the surviving corporation.

On November 3, 2006, WESCO Voltage, Inc., a subsidiary of WESCO Distribution, Inc., was merged with and into Communications Supply Holdings, Inc., a Delaware corporation, with Communications Supply Holdings, Inc. being the surviving corporation.

On June 29, 2007, Carlton-Bates Company of Texas, L.P. was merged with and into Carlton-Bates Company with Carlton-Bates Company being the surviving corporation.

On March 1, 2010, Herning Enterprises, Inc. was merged with and into WESCO Distribution, Inc. with WESCO Distribution, Inc. being the surviving corporation.

Exhibit B-1

703255274 99551574

EX-21.1

Exhibit 21.1

Subsidiaries of WESCO International, Inc.

1502218 Alberta, Ltd., an Alberta corporation

Bruckner Polska sp z.o.o., a Poland limited company

Bruckner Supply Singapore, a Singapore sole proprietor

Bruckner Supply Company, Inc., a Delaware corporation

Calvert-Wire & Cable Corporation, a Delaware corporation

Carlton-Bates Company, an Arkansas corporation

Carlton-Bates Company de Mexico S.A. de C.V., a Mexico variable capital company

Carlton-Bates Company of Texas, G.P., Inc., a Texas corporation

CBC LP Holdings, LLC, a Delaware limited liability company

CDW Holdco, LLC, a Delaware limited liability company

Communications Supply Corporation, a Connecticut corporation

Conney Investment Holdings, LLC, a Delaware limited liability company

Conney Safety Products, LLC, a Delaware limited liability company

Distribuidora Materials Electricos E-Supply Limitada, a Chile limited liability company

EECOL Industrial Electric Ecuador Limitada, an Ecuador limited liability company

EECOL Electric Argentina S.A., an Argentine corporation

EECOL Electric Corp., an Alberta corporation

EECOL Electric Peru S.A.C., a Peru sociedad anonima cerrada

EECOL Holdings Ltd., an Alberta corporation

EECOL Industrial Bolivia Ltda., a Bolivia limited liability company

EECOL Industrial Electric (SudAmerica) Limitada, a Chile limited liability company

EECOL Industrial Electric Limitada, a Chile limited liability company

EECOL Power S.A., a Chile closed stock corporation

EECOL Properties Corp., an Alberta corporation

Liberty-Wire & Cable, Inc., a Delaware corporation

M&M Power Products, LP, a California limited partnership

Obras Y Servicios Sunpark S.A.C. (OS Sunpark), a Peru sociedad anonima cerrada

SASK Alta Holdings S.A., a Chile closely held stock corporation

Stone Eagle Electrical Supply GP, Inc., an Alberta corporation

Stone Eagle Electrical Supply LP, an Alberta limited partnership

TVC Canada Corp., a Nova Scotia unlimited liability company

TVC Communications, L.L.C., a Delaware limited liability company

TVC Espana Distribucion y Venta De Equipos, S.L., a Spain limited liability company

TVC International Holding, L.L.C., a Delaware limited liability company

TVC Mexico Distribution S. de R.L. de C.V., a Mexico limited liability company

TVC Mexico Services S. de R.L. de C.V., a Mexico limited liability company

TVC UK Holdings Limited, a United Kingdom limited company

WDC Holding, Inc., a Delaware corporation

WDCC Enterprises, Inc., an Alberta corporation

WDCH, LP, a Pennsylvania limited partnership

WDCH US LP, a Delaware limited partnership

WDINESCO B.V., a Netherlands private company with limited liability

WDINESCO Cooperatief U.A., a Netherlands company

WDINESCO C.V., a Netherlands limited partnership

WDINESCO II B.V., a Netherlands private company with limited liability

WDINESCO III B.V., a Netherlands private company with limited liability

WDINESCO II C.V., a Netherlands limited partnership

WDINESCO III C.V., a Netherlands limited partnership

WEAS Company, Srl, a Mexico private limited company

WESCO (Suzhou) Trading Co. Ltd., a China limited liability company

WDI Angola, LDA, an Angola company

WESCO Australia Pty Ltd, an Australian company

WESCO Canada I, LP, an Alberta limited partnership

WESCO Canada II, LP, an Alberta limited partnership

WESCO Distribution Canada Co., a Nova Scotia unlimited liability company

WESCO Distribution Canada GP, Inc., a Nova Scotia limited liability company

WESCO Distribution Canada LP, an Ontario limited partnership

WESCO Distribution de Mexico, Srl, a Mexico private limited company

WESCO Distribution HK Limited, a Hong Kong limited private company

WESCO Distribution II ULC, a Nova Scotia unlimited liability company

WESCO Distribution III ULC, a Nova Scotia unlimited liability company

WESCO Distribution International, Ltd., a United Kingdom limited company

WESCO Distribution, Inc., a Delaware Corporation

Wesco do Brasil Equipamentos Eletrônicos Ltda, a Brazil limited liability company

WESCO Enterprises, Inc., a Delaware corporation

WESCO Equity Corporation, a Delaware corporation

WESCO Finance Corporation, a Delaware corporation

WESCO Holdings, LLC, a Delaware limited liability company

WESCO International Supply Co. Singapore Pte Ltd., a Singapore limited private company

WESCO Nevada, Ltd, a Nevada corporation

WESCO Nigeria Ltd., a Nigeria corporation

WESCO Nigeria, Inc., a Delaware corporation

WESCO Real Estate I, LLC, a Delaware limited liability company

WESCO Real Estate II, LLC, a Delaware limited liability company

WESCO Real Estate III, LLC, a Delaware limited liability company

WESCO Real Estate IV, LLC, a Delaware limited liability company

WESCO Receivables Corp., a Delaware corporation

WESCO Sourcing and Procurement Services Pte Ltd., a Singapore limited private company

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No's. 333-81857, 333-81847, 333-81845, 333-81841, 333-91187 and 333-172531) of WESCO International, Inc. of our report dated February 27, 2013 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Pittsburgh, Pennsylvania

February 28, 2013

EX-31.1

Exhibit 31.1

CERTIFICATION

     I, John J. Engel, certify that:

     1. I have reviewed this annual report on Form 10-K of WESCO International, Inc.;

     2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

     (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

     (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

     (c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

     (d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

     (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

     (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	February 28, 2013	By:	/s/ John J. Engel
			John J. Engel
			Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

     I, Kenneth S. Parks, certify that:

     1. I have reviewed this annual report on Form 10-K of WESCO International, Inc.;

     2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

     (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

     (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

     (c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

     (d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

     (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

     (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	February 28, 2013	By:	/s/ Kenneth S. Parks
			Kenneth S. Parks
			Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of WESCO International, Inc. (the “Company”) on Form 10-K for the period ended December 31, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company. 

Date:	February 28, 2013	By:	/s/ John J. Engel
			John J. Engel
			Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of WESCO International, Inc. (the “Company”) on Form 10-K for the period ended December 31, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company. 

Date:	February 28, 2013	By:	/s/ Kenneth S. Parks
			Kenneth S. Parks
			Vice President and Chief Financial Officer

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SELECTED QUARTERLY FINANCIAL DATA (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following table sets forth selected quarterly financial data for the years ended December 31, 2012 and 2011:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2012
Net Sales	$	1,606,018	$	1,672,734	$	1,656,186	$	1,644,363
Cost of goods sold	1,286,268		1,337,062		1,317,432		1,307,093
Income from operations	83,532		96,051		103,032		50,356
Income before income taxes	74,570		84,574		90,378		32,117
Net income	52,940		58,932		63,391		26,496
Net income attributable to WESCO International, Inc.	52,978		58,874		63,415		26,510
Basic earnings per share attributable to WESCO International, Inc.(A)	1.22		1.35		1.45		0.60
Diluted earnings per share attributable to WESCO International, Inc.(B)	1.03		1.15		1.25		0.52
2011
Net Sales	$	1,431,305	$	1,524,515	$	1,580,376	$	1,589,522
Cost of goods sold	1,145,255		1,217,666		1,264,745		1,261,483
Income from operations	64,745		84,996		91,752		91,486
Income before income taxes	52,104		71,065		76,673		79,534
Net income	37,305		50,207		53,890		54,838
Net income attributable to WESCO International, Inc.	37,305		50,207		53,890		54,849
Basic earnings per share attributable to WESCO International, Inc.(A)	0.87		1.16		1.24		1.27
Diluted earnings per share attributable to WESCO International, Inc.(B)	0.74		1.00		1.11		1.12

_________________________

^(A)  Earnings per share (EPS) in each quarter is computed using the weighted average number of shares outstanding during the quarter while EPS for the full year is computed by taking the average of the weighted average number of shares outstanding each quarter. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.

^(B)  Diluted EPS in each quarter is computed using the weighted average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by taking the average of the weighted average number of shares outstanding and common share equivalents each quarter. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.

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PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 14.4	$ 12.5	$ 11.7
Capitalized software amortization	8.1	5.7	4.7
Unamortized software cost	21.1	19.7
Capitalized leases	11.2	9.6
Accumulated amortization related to capitalized leases	$ (5.6)	$ (4.7)

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CONCENTRATIONS OF CREDIT RISK AND SIGNIFICANT SUPPLIERS (Details) (Supplier Concentration Risk, Cost of Goods, Total)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplier Concentration Risk | Cost of Goods, Total
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%	10.00%	12.00%

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Textuals (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer discretionary contribution amount	$ 18.6	$ 16.2	$ 14.2
Defined contribution plan, cost recognized	31.8	27.6	25.3
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 3.9
United States
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent	50.00%
Defined contribution plan, maximum annual contribution per employee, percent	6.00%
Minimum | Canada
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, maximum annual contribution per employee, percent	1.00%
Maximum | Canada
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, maximum annual contribution per employee, percent	7.00%

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DEBT - SCHEDULE OF DEBT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 1,735,172
Total debt	1,735,172	649,333
Less current and short-term portion	39,759	6,411
Total long-term debt	1,695,413	642,922
Term Loan Facility, less debt discount of $9,936
Debt Instrument [Line Items]
Long-term debt	840,827	0
Mortgage financing facility
Debt Instrument [Line Items]
Long-term debt	26,414	37,564
Accounts receivable securitization facility
Debt Instrument [Line Items]
Long-term debt	445,000	250,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	218,295	36,792
7.5% Senior Subordinated Notes due 2017
Debt Instrument [Line Items]
Long-term debt	0	150,000
Foreign lines of credit
Debt Instrument [Line Items]
Long-term debt	30,136	3,261
1.75% Convertible Senior Debentures due 2026
Debt Instrument [Line Items]
Long-term debt	0	56
6.0% Convertible Senior Debentures due 2029
Debt Instrument [Line Items]
Long-term debt	171,213	169,054
Capital leases
Debt Instrument [Line Items]
Long-term debt	3,220	2,521
Other notes
Debt Instrument [Line Items]
Long-term debt	$ 67	$ 85

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EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Defined Benefit Plan Disclosure
Equity securities	$ 35,223
Debt securities	26,227
Total investments	6145000000.00%
Level 1
Defined Benefit Plan Disclosure
Equity securities	0
Debt securities	505
Total investments	50500000.00%
Level 2
Defined Benefit Plan Disclosure
Equity securities	35,223
Debt securities	25,722
Total investments	6094500000.00%
Level 3
Defined Benefit Plan Disclosure
Equity securities	0
Debt securities	$ 0
Total investments	0.00%

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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF INTANGIBLE ASSETS BY MAJOR CLASS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (61,226)	$ (45,501)
Intangible Assets Gross Excluding Goodwill	557,987	202,375
Intangible Assets, Net (Excluding Goodwill)	496,761	156,874
Finite-Lived Intangible Assets, Useful Life, Minimum	4
Finite-Lived Intangible Assets, Useful Life, Maximum	20
Trademarks
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,734	0
Finite-Lived Intangible Assets, Accumulated Amortization	(106)	0
Finite-Lived Intangible Assets, Net	1,628	0
Finite-Lived Intangible Assets, Useful Life, Minimum	4
Finite-Lived Intangible Assets, Useful Life, Maximum	15
Non-compete agreements
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,950	1,252
Finite-Lived Intangible Assets, Accumulated Amortization	(1,858)	(1,038)
Finite-Lived Intangible Assets, Net	92	214
Finite-Lived Intangible Assets, Useful Life, Minimum	5
Finite-Lived Intangible Assets, Useful Life, Maximum	7
Customer relationships
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	362,794	70,670
Finite-Lived Intangible Assets, Accumulated Amortization	(40,094)	(32,527)
Finite-Lived Intangible Assets, Net	322,700	38,143
Finite-Lived Intangible Assets, Useful Life, Minimum	4
Finite-Lived Intangible Assets, Useful Life, Maximum	20
Distribution agreements
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	38,119	35,291
Finite-Lived Intangible Assets, Accumulated Amortization	(9,298)	(6,897)
Finite-Lived Intangible Assets, Net	28,821	28,394
Finite-Lived Intangible Assets, Useful Life, Minimum	10
Finite-Lived Intangible Assets, Useful Life, Maximum	19
Patents
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	48,310	48,310
Finite-Lived Intangible Assets, Accumulated Amortization	(9,870)	(5,039)
Finite-Lived Intangible Assets, Net	38,440	43,271
Finite-Lived Intangible Assets, Useful Life	10
Trademarks
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross	$ 105,080	$ 46,852

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EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the details of basic and diluted earnings per share:

	Year Ended December 31
	2012		2011		2010
(In thousands, except per share data)
Net income	$	201,777	$	196,251	$	115,477
Weighted average common shares outstanding used in computing basic earnings per share	43,677		43,220		42,499
Common shares issuable upon exercise of dilutive stock options	1,147		1,179		840
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,310		5,224		2,774
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,133		49,623		46,113
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.62	$	4.54	$	2.72
Diluted	$	3.95	$	3.96	$	2.50

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STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended								12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2003	Sep. 30, 2012 Performance-based Awards - Peer Group Total Shareholder Return	Dec. 31, 2012 Stock Appreciation Rights (SARs)	Dec. 31, 2011 Stock Appreciation Rights (SARs)	Dec. 31, 2010 Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number								23,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 27.89	$ 26.46	$ 14.71
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				6,936,000
Common Stock, Capital Shares Reserved for Future Issuance				2,300,000
Stock Options Involved In Private Negotiation Transaction							2,900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized				$ 18.0
Employee Service, Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized In Subsequent Fiscal Year			11.5
Employee Service, Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized In Two Years		5.9
Employee Service, Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized In Three Years	0.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value				41.1	13.8	9.9
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options				3.2	0.4	1.8
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense				$ 11.4	$ 5.4	$ 3.1

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EMPLOYEE BENEFIT PLANS Assumptions (Details)	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Discount rate	4.50%
Average salary increases	4.00%

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OTHER FINANCIAL INFORMATION - OTHER FINANCIAL INFORMATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 12, 2012	Dec. 31, 2012 Convertible Senior Debentures Due in 2029
Debt Instrument [Line Items]
Due to Related Parties, Current	$ 40.3
Debt Instrument, Face Amount			700.0	344.9
Interest Expense, Related Party	$ 4.9	$ 5.5

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DEBT - OUTSTANDING CONVERTIBLE DEBENTURE SCHEDULE (Details) (USD $)	Dec. 31, 2012	Dec. 12, 2012	Dec. 31, 2011	Dec. 31, 2012 Convertible Senior Debentures Due in 2026	Dec. 31, 2011 Convertible Senior Debentures Due in 2026	Dec. 31, 2012 Convertible Senior Debentures Due in 2029	Dec. 31, 2011 Convertible Senior Debentures Due in 2029	Aug. 27, 2009 Convertible Senior Debentures Due in 2029	Dec. 31, 2012 Convertible Debt	Dec. 31, 2011 Convertible Debt
Debt Instrument [Line Items]
Principal Balance	$ 1,918,816,000			$ 0	$ 56,000	$ 344,921,000	$ 344,962,000		$ 344,921,000	$ 345,018,000
Debt Instrument, Unamortized Discount	(183,644,000)	(0.010)	(175,908,000)	0	0	(173,708,000)	(175,908,000)	181,200,000	(173,708,000)	(175,908,000)
Total long-term debt	$ 1,735,172,000			$ 0	$ 56,000	$ 171,213,000	$ 169,054,000		$ 171,213,000	$ 169,110,000

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EMPLOYEE BENEFIT PLANS Asset allocations (Details) (USD $)	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Equity securities	57.70%
Debt securities	42.30%
Investments	$ 1.000

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SEGMENTS AND RELATED INFORMATION - SEGMENTS AND RELATED INFORMATION (Details)	Dec. 31, 2012 products stockkeepingunits
Segment Reporting [Abstract]
Product stock keeping units (in stock keeping units)	250,000
Products (in products)	1,000,000

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STOCK-BASED COMPENSATION - SUMMARY OF RESTRICTED STOCK UNITS AND PERFORMANCE-BASED AWARDS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested, Shares	187,335	203,291
Granted	74,724
Vested in Period	(80,539)
Forfeited in Period	(10,141)
Unvested, Weighted Average Fair Value	$ 52.28	$ 37.16
Granted, Weighted Average Fair Value	$ 64.27	$ 60.05	$ 33.05
Vested in Period, Weighted Average Fair Value	$ 26.02
Forfeited in Period, Weighted Average Fair Value	$ 46.09
Performance-based Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested, Shares	46,500	0
Granted	46,804
Vested in Period	0
Forfeited in Period	(304)
Unvested, Weighted Average Fair Value	$ 75.72	$ 0.00
Granted, Weighted Average Fair Value	$ 75.72
Vested in Period, Weighted Average Fair Value	$ 0.00
Forfeited in Period, Weighted Average Fair Value	$ 75.72

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SEGMENTS AND RELATED INFORMATION - SCHEDULE OF REVENUE FROM EXTERNAL CUSTOMERS AND LONG LIVED ASSETS, BY GEOGRAPHICAL AREAS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,644,363	$ 1,656,186	$ 1,672,734	$ 1,606,018	$ 1,589,522	$ 1,580,376	$ 1,524,515	$ 1,431,305	$ 6,579,301	$ 6,125,718	$ 5,063,862
Long-Lived Assets	251,894				157,941				251,894	157,941	131,180
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,216,000	4,994,641	4,198,420
Sales Revenue, Net, Percentage									79.00%	82.00%	83.00%
Long-Lived Assets	144,947				131,989				144,947	131,989	117,768
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,084,000	900,551	682,415
Sales Revenue, Net, Percentage									17.00%	15.00%	13.00%
Long-Lived Assets	100,366				24,609				100,366	24,609	12,446
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									92,000	84,871	51,413
Sales Revenue, Net, Percentage									1.00%	1.00%	1.00%
Long-Lived Assets	532				572				532	572	641
North American Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									6,392,000	5,980,063	4,932,248
Long-Lived Assets	245,845				157,170				245,845	157,170	130,855
Other Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									187,000	145,655	131,614
Sales Revenue, Net, Percentage									3.00%	2.00%	3.00%
Long-Lived Assets	$ 6,049				$ 771				$ 6,049	$ 771	$ 325

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EMPLOYEE BENEFIT PLANS Target asset allocation (Details)	12 Months Ended
	Dec. 31, 2012
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	60.00%
Fixed income bond managers	40.00%
Canadian equities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	25.00%
U.S. equities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	15.00%
Non-North American equities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	20.00%

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EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Accumulated Benefit Obligation (ABO) at December 31	$ 80,252
PBO at beginning of year	0
Effect of acquisition	102,829
Service cost	158
Interest cost	217
Participant contributions	85
Actuarial loss (gain), including assumption changes	277
Benefits paid	(100)
PBO at end of year	103,466
Plan assets at beginning of year	0
Effect of acquisition	60,297
Actual return on plan assets	870
Company contributions	298
Plan assets at end of year	61,450
Funded status	(42,016)
Current liabilities	(201)
Non-current liabilities	(41,815)
Net pension liability at end of year	(42,016)
Net actuarial loss (gain)	(414)
Prior service cost	0
Total recognized in accumulated other comprehensive loss	$ (414)

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SELECTED QUARTERLY FINANCIAL DATA

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

SELECTED QUARTERLY FINANCIAL DATA

SELECTED QUARTERLY FINANCIAL DATA (unaudited)

The following table sets forth selected quarterly financial data for the years ended December 31, 2012 and 2011:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2012
Net Sales	$	1,606,018	$	1,672,734	$	1,656,186	$	1,644,363
Cost of goods sold	1,286,268		1,337,062		1,317,432		1,307,093
Income from operations	83,532		96,051		103,032		50,356
Income before income taxes	74,570		84,574		90,378		32,117
Net income	52,940		58,932		63,391		26,496
Net income attributable to WESCO International, Inc.	52,978		58,874		63,415		26,510
Basic earnings per share attributable to WESCO International, Inc.(A)	1.22		1.35		1.45		0.60
Diluted earnings per share attributable to WESCO International, Inc.(B)	1.03		1.15		1.25		0.52
2011
Net Sales	$	1,431,305	$	1,524,515	$	1,580,376	$	1,589,522
Cost of goods sold	1,145,255		1,217,666		1,264,745		1,261,483
Income from operations	64,745		84,996		91,752		91,486
Income before income taxes	52,104		71,065		76,673		79,534
Net income	37,305		50,207		53,890		54,838
Net income attributable to WESCO International, Inc.	37,305		50,207		53,890		54,849
Basic earnings per share attributable to WESCO International, Inc.(A)	0.87		1.16		1.24		1.27
Diluted earnings per share attributable to WESCO International, Inc.(B)	0.74		1.00		1.11		1.12

_________________________

^(A)  Earnings per share (EPS) in each quarter is computed using the weighted average number of shares outstanding during the quarter while EPS for the full year is computed by taking the average of the weighted average number of shares outstanding each quarter. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.

^(B)  Diluted EPS in each quarter is computed using the weighted average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by taking the average of the weighted average number of shares outstanding and common share equivalents each quarter. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.

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ACQUISITIONS - SCHEDULE OF BUSINESS ACQUISTIONS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Details of acquisitions:
Fair value of assets acquired	$ 1,609,785	$ 54,663
Fair value of liabilities assumed	(288,005)	(6,570)
Deferred acquisition payments	0	0
Cash paid for acquisitions	1,321,780	48,093
Supplemental cash flow disclosure related to acquisitions:
Less: cash acquired	32,300	0
Cash paid for acquisitions, net of cash acquired	$ 1,289,480	$ 48,093

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ACCOUNTING POLICIES - GENERAL (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 23, 2010	Dec. 31, 2010
Defined Benefit Plan Disclosure
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.50%
change in benefit obligation for chnage in discount rate	$ 5,100,000
change in net periodic benefit cost for change in discount rate	300,000
Sales Revenue, Services, Net	17,600,000	10,800,000		11,100,000
Supplier Volume Rebate Receivables	68,700,000	38,500,000
Supplier Volume Rebate Range Low	0.80%
Supplier Volume Rebate Range High	1.30%
Shipping, Handling and Transportation Costs	49,900,000	50,900,000		42,400,000
Allowance for Doubtful Accounts Receivable, Current	17,242,000	21,590,000
Provision for Doubtful Accounts	1,100,000	6,600,000		6,400,000
Inventory Valuation Reserves	16,700,000	14,600,000
Inventory Write-down	11,400,000	5,500,000		7,500,000
General and Administrative Costs in Inventory, Amount Incurred	62,200,000	47,600,000
Increase in deferred charges	17,800,000
Deferred Finance Costs, Net	26,400,000	12,900,000
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)	4
Finite-Lived Intangible Assets, Useful Life, Maximum (in years)	20
Accrued Insurance	11,300,000	9,700,000
Stock-based compensation expense	15,088,000	15,407,000	15,752,000	15,800,000
Debt Instrument, Fair Value Disclosure	2,423,700,000	1,178,900,000
Fixed Rate Debt, Fair Value Disclosures	$ 1,704,500,000	$ 850,900,000
Plan Option 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Participant Contributions Percentage	2.00%
Plan Option 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Participant Contributions Percentage	4.00%

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EMPLOYEE BENEFIT PLANS Benefit payments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
2013	$ 1,921
2014	2,171
2015	2,568
2016	2,645
2017	2,734
2018-2023	$ 16,724

XML

SEGMENTS AND RELATED INFORMATION (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

WESCO attributes revenues from external customers to individual countries on the basis of the point of sale. The following table sets forth information about WESCO by geographic area:

	Net Sales Year Ended December 31,												Long-Lived Assets December 31,
(In thousands)	2012				2011				2010				2012		2011		2010
United States	$	5,216	79	%	$	4,994,641	82	%	$	4,198,420	83	%	$	144,947	$	131,989	$	117,768
Canada	1,084		17	%	900,551		15	%	682,415		13	%	100,366		24,609		12,446
Mexico	92		1	%	84,871		1	%	51,413		1	%	532		572		641
Subtotal North American Operations	6,392				5,980,063				4,932,248				245,845		157,170		130,855
Other Foreign	187		3	%	145,655		2	%	131,614		3	%	6,049		771		325
Total U.S. and Foreign	$	6,579,301			$	6,125,718			$	5,063,862			$	251,894	$	157,941	$	131,180

Revenue from External Customers by Products and Services

The following table sets forth sales information about WESCO’s sales by product category:

Year Ended December 31,	2012	2011	2010
(percentages based on total sales)
General and Industrial Supplies	36%	34%	35%
Wire, Cable and Conduit	17%	18%	18%
Data and Broadband Communications	15%	17%	15%
Power Distribution Equipment	13%	11%	12%
Lighting and Controls	9%	9%	10%
Control, Automation and Motors	10%	11%	10%

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ACQUISITIONS - BUSINESS ACQUISITION, PRO FORMA INFORMATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Combination, Pro Forma Information [Abstract]
Net Sales	$ 7,493,978	$ 6,980,120	$ 5,315,929
Net Income	$ 263,149	$ 235,326	$ 132,455
Earnings per common share:
Basic	$ 6.02	$ 5.44	$ 3.12
Diluted	$ 5.15	$ 4.74	$ 2.87

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INCOME TAXES - SCHEDULE OF INCOME TAX CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance January 1	$ 20,878		$ 3,394		$ 8,085
Additions based on tax positions related to the current year	929		265		1,439
Additions for tax positions of prior years	1,224	[1]	20,064	[1]	4,668	[1]
Additions for acquired tax positions	1,825		0		0
Reductions for tax positions of prior years	(85)		(2,161)		(8,818)
Settlements	(3,400)		(512)		(1,368)
Lapse in statute of limitations	(296)		(172)		(612)
Ending balance December 31	$ 21,075		$ 20,878		$ 3,394

[1] In 2011, additions for tax positions of prior years primarily relate to transfer pricing issues between the United Statesand Canada, which are under review by the Canadian Competent Authority. A corresponding deferred tax asset in the amount of $23.1 million excluding interest has been recorded for the position in the United States.

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INCOME TAXES - ADDITIONAL INFORMATION (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 11,300,000	$ 5,600,000	$ 8,200,000
Undistributed Earnings of Foreign Subsidiaries	323,500,000
Deferred Tax Asset, Tranfser Pricing		23,100,000
Unrecognized Tax Benefits	21,075,000	20,878,000	3,394,000	8,085,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	21,200,000	19,700,000	1,900,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	14,700,000
reversal of deferred tax asset	12,200,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	8,000,000	11,400,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense, IRS Appeals Settlement	$ 3,400,000

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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF EXPECTED AMORTIZATION EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013	$ 39,239
2014	38,014
2015	36,075
2016	34,889
2017	$ 33,895

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ORGANIZATION

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION

ORGANIZATION

WESCO International, Inc. ("WESCO International") and its subsidiaries (collectively, “WESCO”), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating (“MRO”) and original equipment manufactures (“OEM”) products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. We serve over 65,000 active customers globally, through approximately 475 full service branches and nine distribution centers located primarily in the United States, Canada and Mexico, with operations in 15 additional countries.

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INCOME TAXES - SCHEDULE OF COMPONENTS OF INCOME TAX EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Current taxes
Federal	$ 51,132	[1]	$ 60,415	[1]	$ 11,363	[1]
State	6,006		5,705		2,018
Foreign	5,079		2,643		7,801
Total current	62,217		68,763		21,182
Deferred taxes
Federal	15,034		9,692		21,069
State	1,080		2,187		1,112
Foreign	1,549		2,494		(1,199)
Total deferred	17,663		14,373		20,982
Income tax expense	$ 79,880		$ 83,136		$ 42,164

[1] Tax benefits related to stock options and other equity instruments recorded directly to additional paid in capital totaled $11.3 million, $5.6 million and $8.2 million in 2012, 2011 and 2010, respectively.

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ACCOUNTING POLICIES - PPE (Details) (USD $)					12 Months Ended
	Dec. 31, 2012 branches	Dec. 31, 2012	Dec. 31, 2012 distribution_centers	Dec. 31, 2011	Dec. 31, 2012 Leasehold Improvements Y	Dec. 31, 2012 Furniture, Fixtures and Equipment Y	Dec. 31, 2012 Software Y	Dec. 31, 2012 Land, Buildings and Improvements	Dec. 31, 2012 Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum					5	3	3
Property, Plant and Equipment, Useful Life, Maximum					40	10	5
Property, buildings and equipment, net			$ 210,723,000	$ 133,550,000				$ 136,800,000	$ 28,500,000
Full service branches (in branches)	475	475	475
Distribution centers (in distribution centers)	9	9	9
Goodwill and Indefinite Lived Intangible Assets			1,882,900,000	1,055,000,000
Trademarks Subject to a Decline in Performance			$ 18,100,000

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ACQUISITIONS (Tables)

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table sets forth the consideration paid for acquisitions:

Year Ended December 31	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	1,609,785		$	54,663
Fair value of liabilities assumed	(288,005		)	(6,570		)
Deferred acquisition payments	—			—
Cash paid for acquisitions	$	1,321,780		$	48,093
Supplemental cash flow disclosure related to acquisitions:
Cash paid for acquisitions	$	1,321,780		$	48,093
Less: cash acquired	(32,300		)	—
Cash paid for acquisitions, net of cash acquired	$	1,289,480		$	48,093

Schedule of Purchase Price Allocation

The following summary presents the fair value of the assets acquired and liabilities assumed for the EECOL acquisition.

	EECOL
(In thousands)
Assets Acquired
Cash and cash equivalents	$	32,300
Trade accounts receivable	136,178
Other accounts receivable	23,187
Inventories	118,244
Prepaid expenses and other current assets	25,133
Property, buildings and equipment	73,129
Intangible assets	300,439
Goodwill	670,362
Other noncurrent assets	15,510
Total assets acquired	1,394,482
Liabilities Assumed
Accounts payable	76,509
Accrued expenses and other current liabilities	63,476
Short-term debt	5,734
Deferred income taxes - long-term	75,031
Long-term debt	6,205
Other long-term liabilities	46,870
Total liabilities assumed	273,825
Fair value of net assets acquired, including intangible assets	$	1,120,657

The allocation of assets acquired and liabilities assumed for the TVC Communications acquisition is summarized below:

	TVC Communications, LLC
(In thousands)
Assets Acquired
Cash and cash equivalents	$	1,475
Trade accounts receivable	38,744
Other accounts receivable	978
Inventories	41,313
Prepaid expenses and other current assets	1,377
Property, buildings and equipment	2,268
Intangible assets	86,442
Goodwill	109,183
Other noncurrent assets	158
Total assets acquired	281,938
Liabilities Assumed
Accounts payable	24,249
Accrued payroll and benefit costs	1,183
Other current liabilities	4,019
Total liabilities assumed	29,451
Fair value of net assets acquired, including intangible assets	$	252,487

Business Acquisition, Pro Forma Information

This summary of the unaudited pro forma results of operations is not necessarily indicative of what WESCO's results of operations would have been had EECOL been acquired at the beginning of 2011, nor does it purport to represent results of operations for any future periods.

Year Ended December 31	2012		2011
(In thousands, except per share data)
Net Sales	$	7,493,978	$	6,980,120
Net Income	263,149		235,326
Earnings per common share:
Basic	$	6.02	$	5.44
Diluted	$	5.15	$	4.74

Unaudited pro forma results of operations (in thousands, except per share data) for the twelve months ended December 31, 2010 are included below as if the acquisition occurred on the first day.

Year Ended December 31	2010
(In thousands, except per share data)
Net Sales	$	5,315,929
Net Income	132,455
Earnings per common share:
Basic	$	3.12
Diluted	$	2.87

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GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table sets forth the changes in the carrying amount of goodwill:

	Year Ended December 31
	2012			2011
	(In thousands)
Beginning balance January 1	$	1,008,127		$	985,714
Translation adjustments	(15,592		)	(3,597		)
Additions to goodwill for acquisitions	785,262			26,010
Ending balance December 31	$	1,777,797		$	1,008,127

Schedule of Intangible Assets by Major Class

The components of intangible assets are as follows:

	December 31, 2012								December 31, 2011
	Life	Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount		Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount
	(In thousands)
Intangible assets:
Trademarks	Indefinite	$	105,080	$	—		$	105,080	$	46,852	$	—		$	46,852
Trademarks	4-15	1,734		(106		)	1,628		—		—			—
Non-compete agreements	5-7	1,950		(1,858		)	92		1,252		(1,038		)	214
Customer relationships	4-20	362,794		(40,094		)	322,700		70,670		(32,527		)	38,143
Distribution agreements	10-19	38,119		(9,298		)	28,821		35,291		(6,897		)	28,394
Patents	10	48,310		(9,870		)	38,440		48,310		(5,039		)	43,271
		$	557,987	$	(61,226	)	$	496,761	$	202,375	$	(45,501	)	$	156,874

_________________________

⁽¹⁾  Excludes the original cost and accumulated amortization of fully-amortized intangibles.

Schedule of Expected Amortization Expense

The following table sets forth the estimated amortization expense for intangibles for the next five years (in thousands):

	Estimated
	Amortization
For the year ended December 31,	Expense
2013	$	39,239
2014	38,014
2015	36,075
2016	34,889
2017	33,895

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DEBT - DEBT (Details) (USD $)	12 Months Ended				12 Months Ended							12 Months Ended			12 Months Ended			1 Months Ended	8 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 12, 2012	Dec. 31, 2012 Term Loan Facility	Dec. 31, 2011 Term Loan Facility	Dec. 31, 2012 Mortgages	Dec. 31, 2011 Mortgages	Dec. 31, 2003 Mortgages	Dec. 31, 2012 Accounts receivable securitization facility	Dec. 31, 2011 Accounts receivable securitization facility	Dec. 31, 2012 Revolving credit facility	Dec. 31, 2011 Revolving credit facility	Dec. 31, 2012 Letter of Credit	Oct. 14, 2013 2017 Senior Subordinated Notes	Dec. 31, 2012 2017 Senior Subordinated Notes	Dec. 31, 2011 2017 Senior Subordinated Notes	Aug. 31, 2009 Convertible Senior Debentures Due in 2029	Aug. 27, 2009 Convertible Senior Debentures Due in 2029	Dec. 31, 2012 Convertible Senior Debentures Due in 2029	Dec. 31, 2011 Convertible Senior Debentures Due in 2029	Jan. 03, 2012 Convertible Senior Debentures Due in 2026	Jan. 31, 2009 Convertible Senior Debentures Due in 2026	Nov. 30, 2006 Convertible Senior Debentures Due in 2026	Dec. 31, 2012 Convertible Senior Debentures Due in 2026	Dec. 31, 2011 Convertible Senior Debentures Due in 2026	Aug. 27, 2009 Convertible Senior Debentures Due in 2026	Aug. 27, 2009 Convertible Senior Debentures Due In 2025	Dec. 31, 2012 Canada	Dec. 12, 2012 Canada	Dec. 31, 2012 Canada Revolving credit facility	Dec. 31, 2012 Minimum	Dec. 31, 2012 Minimum Revolving credit facility	Dec. 31, 2012 Minimum LIBOR Revolving credit facility	Dec. 31, 2012 Minimum Alternative Rate Revolving credit facility	Dec. 31, 2012 Maximum	Dec. 31, 2012 Maximum Revolving credit facility	Dec. 31, 2012 Maximum LIBOR Revolving credit facility	Dec. 31, 2012 Maximum Alternative Rate Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 51,000,000			$ 400,000,000	$ 600,000,000	$ 90,000,000																	$ 400,000,000	$ 500,000				$ 8,000,000
Line of Credit Facility, Amount Outstanding	850,800,000						26,400,000
Debt, Weighted Average Interest Rate	4.50%																												5.20%
Debt Instrument, Periodic Payment, Principal	0.0025
Increase to Purchase Commitments												100,000,000
Debt Instrument, Basis Spread on Variable Rate																																		1.50%	0.50%			2.00%	1.00%
Reduction in Interest Rate Margin												0.25%
Accounts Receivable Securitization Facility, Maximum Borrowing Capacity										475,000,000	450,000,000
Accounts Receivable Eligible for Securitization										601,100,000	613,900,000
Accounts Receivable from Securitization										445,000,000	250,000,000
Debt Instrument, Interest Rate at Period End										1.40%		2.50%
Leverage Ratio																																	1.0				2.5
Average Daily Excess Availability													160,000,000
upper range of minimum fixed charge coverage ratio	1.1
lower range of minimum fixed charge coverage	1.0
Debt Instrument, Increase, Additional Borrowings	300,000,000											814,100,000	435,700,000
Debt Instrument, Decrease, Repayments												632,900,000	398,900,000
Long-term debt	1,735,172,000				840,827,000	0	26,414,000	37,564,000		445,000,000	250,000,000	218,295,000	36,792,000			0	150,000,000			171,213,000	169,054,000				0	56,000
Line of Credit Facility, Remaining Borrowing Capacity												270,900,000	299,300,000
Debt Instrument, Interest Rate, Stated Percentage							6.50%									7.50%					6.00%					1.75%
Redemption Price, Percentage of Principal Amount															101.25%					100.00%		100.00%
redemption price percentage	103.00%
Proceeds from Issuance of Debt																								300,000,000
Debt Instrument, Face Amount				700,000,000															345,000,000			100,000					299,700,000	57,700,000		150,000,000
Debt Instrument, Convertible, Effective Interest Rate																			13.875%				6.00%
Interest Expense	47,762,000	53,603,000	57,563,000		100,000															2,200,000	2,500,000				100,000
Gain on debt exchange	(3,470,000)	0	0															6,000,000
Debt discount on convertible debentures	(183,644,000)	(175,908,000)		(0.010)	(9,936,000)														181,200,000	(173,708,000)	(175,908,000)				0	0				(0.020)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt																			106,500,000
Debt discount amortization					1,400,000
2013	39,239,000																			2,900,000
2014	38,014,000																			3,300,000
2015	36,075,000																			3,800,000
2016	34,889,000																			4,300,000
2017	33,895,000																			4,900,000
Percent of Principal Amount Contigent on Additional Interest Payment																				120.00%
contingent interest payable amount	$ 1,000
Contingent Interest Payable Percentage of Average Trading Price																				0.25%
Common Stock, Par or Stated Value Per Share	$ 0.01
Debt Instrument, Convertible, Conversion Ratio																				34.6433
Debt Instrument, Convertible, Conversion Price																				$ 28.87

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GOODWILL AND INTANGIBLE ASSETS - TEXTUALS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense	$ 15.1	$ 13.4	$ 7.5

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PROPERTY, BUILDINGS AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

The following table sets forth the components of property, buildings and equipment:

	December 31,
	2012			2011
	(In thousands)
Buildings and leasehold improvements	$	144,627		$	96,527
Furniture, fixtures and equipment	161,135			152,164
Software costs	54,652			44,909
	360,414			293,600
Accumulated depreciation and amortization	(199,115		)	(190,385		)
	161,299			103,215
Land	38,431			21,097
Construction in progress	10,993			9,238
	$	210,723		$	133,550

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DEBT (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Schedule of Debt

The following table sets forth WESCO’s outstanding indebtedness:

	As of December 31,
	2012			2011
	(In thousands)
Term Loan Facility, less debt discount of $9,936	$	840,827		$	—
Mortgage financing facility	26,414			37,564
Accounts receivable securitization facility	445,000			250,000
Revolving credit facility	218,295			36,792
7.50% Senior Subordinated Notes due 2017	—			150,000
Foreign lines of credit	30,136			3,261
1.75% Convertible Senior Debentures due 2026, less debt discount of $0 in 2012 and 2011	—			56
6.0% Convertible Senior Debentures due 2029, less debt discount of $173,708 and $175,908 in 2012 and 2011, respectively	171,213			169,054
Capital leases	3,220			2,521
Other notes	67			85
Total debt	1,735,172			649,333
Less current and short-term portion	(39,759		)	(6,411		)
Total long-term debt	$	1,695,413		$	642,922

Outstanding Convertible Debenture Schedule

The following table sets forth the components of WESCO’s outstanding convertible debenture indebtedness:

	December 31, 2012							December 31, 2011
	Principal Balance		Discount			Net Carrying Amount		Principal Balance		Discount			Net Carrying Amount
(In thousands)
Convertible Debentures:
2026	$	—	$	—		$	—	$	56	$	—		$	56
2029	344,921		(173,708		)	171,213		344,962		(175,908		)	169,054
	$	344,921	$	(173,708	)	$	171,213	$	345,018	$	(175,908	)	$	169,110

Schedule of Maturities of Long-term Debt

The following table sets forth the aggregate principal repayment requirements for all indebtedness for the next five years and thereafter, as of December 31, 2012:

(In thousands)
2013	$	66,173
2014	454,436
2015	9,192
2016	227,162
2017	8,691
Thereafter	1,153,162
Total payments on debt	1,918,816
Debt discount on convertible debentures and term loan facility	(183,644		)
Total long-term debt	$	1,735,172

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CONSOLIDATED STATEMENTS OF CASH FLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Cash Flows Parenthetical [Abstract]
Equity income, distributions	$ 0	$ 0	$ 1,864

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense

The following table sets forth the components of the provision for income taxes:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
Current taxes:
Federal(1)	$	51,132	$	60,415	$	11,363
State	6,006		5,705		2,018
Foreign	5,079		2,643		7,801
Total current	62,217		68,763		21,182
Deferred taxes:
Federal	15,034		9,692		21,069
State	1,080		2,187		1,112
Foreign	1,549		2,494		(1,199		)
Total deferred	17,663		14,373		20,982
	$	79,880	$	83,136	$	42,164

_________________________

⁽¹⁾  Tax benefits related to stock options and other equity instruments recorded directly to additional paid in capital totaled $11.3 million, $5.6 million and $8.2 million in 2012, 2011 and 2010, respectively.

Schedule of Income before Income Tax, Domestic and Foreign

The following table sets forth the components of income before income taxes by jurisdiction:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
United States	$	255,700	$	260,859	$	166,108
Foreign	25,938		18,517		(8,467		)
	$	281,639	$	279,376	$	157,641

Schedule of Effective Income Tax Rate Reconciliation

The following table sets forth the reconciliation between the federal statutory income tax rate and the effective rate:

	Year Ended December 31
	2012		2011		2010
Federal statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal tax benefit	1.8		2.1		1.5
Nondeductible expenses	1.0		0.7		1.3
Domestic tax benefit from foreign operations	(0.2	)	—		(0.3	)
Foreign tax rate differences	(0.9	)	(0.8	)	0.2
Tax effect of intercompany financing	(6.3	)	(6.1	)	(10.6	)
Federal tax credits	—		(0.1	)	(0.1	)
Domestic production activity deduction	(0.5	)	(0.5	)	(0.5	)
Adjustment related to uncertain tax positions	(0.6	)	(0.7	)	(4.2	)
Revaluation of deferred tax items	(0.1	)	0.4		1.9
Other	(0.8	)	(0.2	)	2.5
	28.4	%	29.8	%	26.7	%

Schedule of Deferred Tax Assets and Liabilities

The following table sets forth deferred tax assets and liabilities:

	December 31
	2012				2011
			(In thousands)
	Assets		Liabilities		Assets		Liabilities
Accounts receivable	$	2,518	$	—	$	4,015	$	—
Inventory	—		4,412		—		6,515
Depreciation	—		13,423		—		6,064
Amortization of intangible assets	—		242,745		—		162,675
Convertible debt interest	—		105,871		—		93,736
Employee benefits	40,485		—		30,454		—
Tax loss carryforwards	23,289		—		24,232		—
Other	50,723		8,558		37,529		3,938
Total deferred taxes	$	117,015	$	375,009	$	96,230	$	272,928

Summary of Income Tax Examinations

The following summary sets forth the tax years that remain open in the Company’s major tax jurisdictions:

United States — Federal	2000 and forward *
United States — States	2007 and forward
Canada	2003 and forward

* Open by waiver of statute only.

Summary of Income Tax Contingencies

The following table sets forth the reconciliation of gross unrecognized tax benefits:

	December 31,
	2012			2011			2010
	(In thousands)
Beginning balance January 1	$	20,878		$	3,394		$	8,085
Additions based on tax positions related to the current year	929			265			1,439
Additions for tax positions of prior years(1)	1,224			20,064			4,668
Additions for acquired tax positions	1,825			—			—
Reductions for tax positions of prior years	(85		)	(2,161		)	(8,818		)
Settlements	(3,400		)	(512		)	(1,368		)
Lapse in statute of limitations	(296		)	(172		)	(612		)
Ending balance December 31	$	21,075		$	20,878		$	3,394

_________________________

⁽¹⁾     In 2011, additions for tax positions of prior years primarily relate to transfer pricing issues between the United States

and Canada, which are under review by the Canadian Competent Authority. A corresponding deferred tax asset in the amount of $23.1 million excluding interest has been recorded for the position in the United States.

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STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
WESCO expected volatility	50.00%	49.00%	49.00%
Risk-free interest rate	0.90%	2.30%	1.80%
Performance-based Awards - Peer Group Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date share price	64,330
WESCO expected volatility	41.97%
Peer group median volatility	33.40%
Risk-free interest rate	0.40%
Correlation	135.40%

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Schedule II - Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Allowance for Doubtful Accounts

	(In thousands)
	Balance at Beginning		Charged to		Charged to Other					Balance at
(In thousands)	of Period		Expense		Accounts		Deductions(1)			End of Period
Allowance for doubtful accounts
Year ended December 31, 2012	$	21,590	$	1,119	$	—	$	(5,467	)	$	17,242
Year ended December 31, 2011	18,562		6,583		—		(3,555		)	21,590
Year ended December 31, 2010	20,060		6,439		—		(7,937		)	18,562

_________________________

⁽¹⁾  Includes a reduction in the allowance for doubtful accounts due to write-off of accounts receivable.

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PROPERTY, BUILDINGS AND EQUIPMENT - SCHEDULE OF PROPERTY, BUILDINGS AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (199,115)	$ (190,385)
Property, buildings and equipment, net	210,723	133,550
Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	144,627	96,527
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	161,135	152,164
Software costs
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	54,652	44,909
Depreciable Assets
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	360,414	293,600
Property, buildings and equipment, net	161,299	103,215
Land
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	38,431	21,097
Construction in progress
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	$ 10,993	$ 9,238

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EMPLOYEE BENEFIT PLANS Pension Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 158
Interest cost	217
Expected return on plan assets	(177)
Total net periodic pension cost	198
changes in other accumulated comprehensive income	(416)
Total recognized in net periodic pension cost and other comprehensive earnings	$ (218)

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 86,099	$ 63,869
Trade accounts receivable, net of allowance for doubtful accounts of $24,248 and $21,590 in 2012 and 2011, respectively	1,036,235	939,422
Other accounts receivable	89,801	43,442
Inventories, net	793,974	626,967
Current deferred income taxes	42,151	28,217
Income taxes receivable	8,849	12,206
Prepaid expenses and other current assets	44,728	23,297
Total current assets	2,101,837	1,737,420
Property, buildings and equipment, net	210,723	133,550
Intangible assets, net	496,761	156,874
Goodwill	1,777,797	1,008,127
Deferred income taxes	1,342	18,090
Other assets	41,169	24,391
Total assets	4,629,629	3,078,452
Current Liabilities:
Accounts payable	706,580	642,777
Accrued payroll and benefit costs	86,375	76,915
Short-term debt	30,136	0
Current portion of long-term debt	9,623	6,411
Bank overdrafts	39,641	47,489
Current deferred income taxes	1,018	0
Other current liabilities	134,622	72,254
Total current liabilities	1,007,995	845,846
Long-term debt, net of discount of $182,213 and $175,908 in 2012 and 2011, respectively	1,695,413	642,922
Deferred income taxes	300,470	223,005
Other noncurrent liabilities	72,060	20,769
Total liabilities	3,075,938	1,732,542
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	0	0
Additional capital	1,065,550	1,036,867
Retained earnings	1,092,719	891,789
Treasury stock, at cost; 18,102,528 and 17,936,923 shares in 2012 and 2011, respectively	(604,050)	(593,329)
Accumulated other comprehensive income	(1,044)	10,057
Total WESCO International stockholders' equity	1,553,797	1,345,998
Noncontrolling interest	(106)	(88)
Total stockholders' equity	1,553,691	1,345,910
Total liabilities and stockholders' equity	4,629,629	3,078,452
Common Stock
Stockholders' Equity:
Common Stock	579	571
Common Class B
Stockholders' Equity:
Common Stock	$ 43	$ 43

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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Roll Forward]
Beginning balance January 1	$ 1,008,127	$ 985,714
Translation adjustments	(15,592)	(3,597)
Additions to goodwill for acquisitions	785,262	26,010
Ending balance December 31	$ 1,777,797	$ 1,008,127

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Parenthetical [Abstract]
Tax benefit from exercise of stock options	$ 11,139	$ 5,365	$ 3,082

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Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$ 17,242		$ 21,590		$ 18,562		$ 20,060
Valuation Allowances and Reserves, Charged to Cost and Expense	1,119		6,583		6,439
Valuation Allowances and Reserves, Charged to Other Accounts	0		0		0
Valuation Allowances and Reserves, Deductions	$ (5,467)	[1]	$ (3,555)	[1]	$ (7,937)	[1]

[1] (1) Includes a reduction in the allowance for doubtful accounts due to write-off of accounts receivable.

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CAPITAL STOCK (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Par or Stated Value Per Share	$ 0.01
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 106.3	$ 106.4
Common Stock
Class of Stock [Line Items]
Common Stock, Shares Authorized	210,000,000	210,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Class B
Class of Stock [Line Items]
Common Stock, Shares Authorized	20,000,000	20,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01

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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity

The following table sets forth a summary of both stock options and stock appreciation rights and related information for the years indicated:

	2012							2011				2010
	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value (In thousands)		Awards		Weighted Average Exercise Price		Awards		Weighted Average Exercise Price
Beginning of year	4,266,533		$	39.64				4,498,303		$	36.38	4,226,153		$	35.30
Granted	257,932		64.12					399,260		59.16		708,949		33.19
Exercised	(1,340,986	)	30.54					(543,154	)	25.83		(335,155	)	14.79
Cancelled	(41,458	)	49.96					(87,876	)	46.86		(101,644	)	40.62
End of year	3,142,021		45.40		5.8	$	53,058	4,266,533		39.64		4,498,303		36.38
Exercisable at end of year	2,450,391		$	43.16	5.1	$	46,898	3,176,161		$	39.23	3,011,120		$	38.65

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

WESCO granted the following stock-settled stock appreciation rights at the following weighted average assumptions:

	2012	2011	2010
Stock-settled appreciation rights granted	257,932	399,260	708,949
Risk free interest rate	0.9%	2.3%	1.8%
Expected life (in years)	5	5	5
Expected volatility	50%	49%	49%

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table sets forth a summary of performance-based awards for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at December 31, 2012	46,500		$	75.72

The following table sets forth a summary of time-based restricted stock units and related information for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(80,539	)	26.02
Forfeited	(10,141	)	46.09
Unvested at December 31, 2012	187,335		$	52.28

Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

The fair value of the performance shares based on total stockholder return granted during the year ended December 31, 2012 were estimated using the following weighted-average assumptions:

Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

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INCOME TAXES - SCHEDULE OF DEFERRED TAX ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Net [Abstract]
Accounts receivable	$ 2,518	$ 4,015
Employee benefits	40,485	30,454
Tax loss carryforwards	23,289	24,232
Other	50,723	37,529
Deferred taxes, Assets	117,015	96,230
Deferred Tax Liabilities [Abstract]
Inventory	4,412	6,515
Depreciation	13,423	6,064
Amortization of intangible assets	242,745	162,675
Convertible debt interest	105,871	93,736
Other	8,558	3,938
Deferred taxes, Liabilities	$ 375,009	$ 272,928

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Future minimum rental payments required under operating leases, primarily for real property that have noncancelable lease terms in excess of one year as of December 31, 2012, are as follows:

(In thousands)
2013	$	53,463
2014	40,253
2015	35,726
2016	29,147
2017	22,990
Thereafter	53,092

Rental expense for the years ended December 31, 2012, 2011 and 2010 was $50.0 million, $48.0 million and $45.4 million, respectively.

From time to time, a number of lawsuits and claims have been or may be asserted against WESCO relating to the conduct of its business, including routine litigation relating to commercial and employment matters. The outcomes of litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to WESCO. However, management does not believe that the ultimate outcome is likely to have a material adverse effect on WESCO’s financial condition or liquidity, although the resolution in any fiscal quarter of one or more of these matters may have a material adverse effect on WESCO’s results of operations for that period.

As initially reported in our 2008 Annual Report on Form 10-K, WESCO International, Inc. (the “Company”), through its wholly owned subsidiary, WESCO Distribution, Inc., is a defendant in a lawsuit filed in a state court in Indiana in which a customer, ArcelorMittal Indiana Harbor, Inc. (“AIH”), alleges that the Company sold defective products to AIH in 2004 that were supplied to the Company by others.  The lawsuit sought monetary damages in the amount of approximately $50 million.  On February 14, 2013, the jury returned a verdict in favor of AIH and awarded damages in the amount of approximately $36 million. Judgment was entered on the jury's verdict on February 14, 2013. The Company disputes this outcome and intends to appeal the judgment. The judgment amount may increase or decrease based on the outcome of various post-trial proceedings, which cannot be predicted with certainty. The Company has also submitted the claims to its insurance carriers.

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum rental payments required under operating leases, primarily for real property that have noncancelable lease terms in excess of one year as of December 31, 2012, are as follows:

(In thousands)
2013	$	53,463
2014	40,253
2015	35,726
2016	29,147
2017	22,990
Thereafter	53,092

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OTHER FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2012

Condensed Financial Information [Abstract]

OTHER FINANCIAL INFORMATION

OTHER FINANCIAL INFORMATION

WESCO International has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution, a 100% owned subsidiary of WESCO International, on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.

Condensed consolidating financial information for WESCO International, WESCO Distribution, Inc. and the non-guarantor subsidiaries is as follows:

CONDENSED CONSOLIDATING BALANCE SHEETS

	December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	6	$	52,275	$	33,818	$	—		$	86,099
Trade accounts receivable, net	—		—		1,036,235		—			1,036,235
Inventories, net	—		347,008		446,966		—			793,974
Other current assets	—		66,106		119,423		—			185,529
Total curent assets	6		465,389		1,636,442		—			2,101,837
Intercompany receivables, net	—		—		1,077,001		(1,077,001		)	—
Property, buildings and equipment, net	—		58,523		152,200		—			210,723
Intangible assets, net	—		6,153		490,608		—			496,761
Goodwill and other intangibles, net	—		246,125		1,531,672		—			1,777,797
Investments in affiliates and other noncurrent assets	2,443,259		3,607,616		20,997		(6,029,361		)	42,511
Total assets	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629
Accounts payable	$	—	$	401,016	$	305,564	$	—		$	706,580
Short-term debt	—		—		30,136		—			30,136
Other current liabilities	18,419		100,956		151,904		—			271,279
Total current liabilities	18,419		501,972		487,604		—			1,007,995
Intercompany payables, net	671,736		405,265		—		(1,077,001		)	—
Long-term debt	171,213		847,761		676,439		—			1,695,413
Other noncurrent liabilities	28,099		190,294		154,137		—			372,530
Stockholders’ equity	1,553,798		2,438,514		3,590,740		(6,029,361		)	1,553,691
Total liabilities and stockholders’ equity	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,816,069		(1,816,069		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,142		3,415,896		31,745		(5,624,302		)	42,481
Total assets	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		4,809		190,463		—			203,069
Total current liabilities	7,797		428,318		409,731		—			845,846
Intercompany payables, net	668,447		1,147,622		—		(1,816,069		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,345,988		2,214,225		3,409,999		(5,624,302		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,442,714	$	3,265,007		$	(128,420	)	$	6,579,301
Cost of goods sold	—		2,738,941		2,637,334			(128,420		)	5,247,855
Selling, general and administrative expenses	59		593,400		367,555			—			961,014
Depreciation and amortization	—		15,208		22,353			—			37,561
Results of affiliates’ operations	235,467		184,947		—			(420,414		)	—
Interest expense, net	23,163		17,683		6,916			—			47,762
Loss on debt extinguishment	—		3,470		—			—			3,470
Provision for income taxes	10,486		23,493		45,901			—			79,880
Net income (loss)	201,759		235,466		184,948			(420,414		)	201,759
Less: Net loss attributable to noncontrolling interest	—		—		(18		)	—			(18		)
Net income (loss) attributable to WESCO International, Inc.	$	201,759	$	235,466	$	184,966		$	(420,414	)	$	201,777

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,230,753	$	2,998,639		$	(103,674	)	$	6,125,718
Cost of goods sold	—		2,585,978		2,406,845			(103,674		)	4,889,149
Selling, general and administrative expenses	70		546,902		325,011			—			871,983
Depreciation and amortization	—		11,996		19,611			—			31,607
Results of affiliates’ operations	229,621		176,581		—			(406,202		)	—
Interest expense, net	23,990		21,382		8,231			—			53,603
Provision for income taxes	9,321		11,455		62,360			—			83,136
Net income	196,240		229,621		176,581			(406,202		)	196,240
Less: Net loss attributable to noncontrolling interest	—		—		(11		)	—			(11		)
Net income attributable to WESCO International, Inc.	$	196,240	$	229,621	$	176,592		$	(406,202	)	$	196,251

CONDENSED CONSOLIDATING STATEMENTS OF INCOME (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.			Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,820,855		$	2,318,495	$	(75,488	)	$	5,063,862
Cost of goods sold	—		2,262,038			1,878,875		(75,488		)	4,065,425
Selling, general and administrative expenses	234		518,100			245,249		—			763,583
Depreciation and amortization	—		12,581			11,354		—			23,935
Results of affiliates’ operations	153,107		130,267			—		(283,374		)	—
Interest expense, net	27,565		22,291			7,707		—			57,563
Other income	—		(4,285		)	—		—			(4,285		)
Provision for income taxes	9,831		(12,708		)	45,041		—			42,164
Net income attributable to WESCO International, Inc.	$	115,477	$	153,105		$	130,269	$	(283,374	)	$	115,477

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(15,897	)	$	300,932		$	3,149		$	—		$	288,184
Investing activities:
Capital expenditures	—			(18,697		)	(4,387		)	—			(23,084		)
Acquisition payments	—			(142,483		)	(1,146,997		)	—			(1,289,480		)
Advances to subsidiaries and other	—			(1,149,143		)	1,558			1,149,143			1,558
Net cash used in investing activities	—			(1,310,323		)	(1,149,826		)	1,149,143			(1,311,006		)
Financing activities:
Net borrowings (repayments)	13,646			1,039,590			1,163,743			(1,149,143		)	1,067,836
Equity transactions	2,252			—			—			—			2,252
Other	—			(22,336		)	(3,704		)	—			(26,040		)
Net cash provided provided by financing activities	15,898			1,017,254			1,160,039			(1,149,143		)	1,044,048
Effect of exchange rate changes on cash and cash equivalents	—			—			1,004			—			1,004
Net change in cash and cash equivalents	1			7,863			14,366			—			22,230
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—			63,869
Cash and cash equivalents at the end of period	$	6		$	52,275		$	33,818		$	—		$	86,099

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(19,823	)	$	181,348		$	6,008		$	—		$	167,533
Investing activities:
Capital expenditures	—			(28,602		)	(4,745		)	—			(33,347		)
Acquisition payments	—			(7,750		)	(40,343		)	—			(48,093		)
Advances to subsidiaries and other	—			(43,936		)	—			44,033			97
Net cash used in investing activities	—			(80,288		)	(45,088		)	44,033			(81,343		)
Financing activities:
Net borrowings (repayments)	21,840			(105,931		)	44,033			(44,033		)	(84,091		)
Equity transactions	(2,013		)	—			—			—			(2,013		)
Other	—			16,942			(1,746		)	—			15,196
Net cash provided (used) by financing activities	19,827			(88,989		)	42,287			(44,033		)	(70,908		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,990		)	—			(4,990		)
Net change in cash and cash equivalents	4			12,071			(1,783		)	—			10,292
Cash and cash equivalents at the beginning of year	1			32,341			21,235			—			53,577
Cash and cash equivalents at the end of period	$	5		$	44,412		$	19,452		$	—		$	63,869

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(96,685	)	$	301,578		$	(77,610	)	$	—		$	127,283
Investing activities:
Capital expenditures	—			(12,903		)	(2,229		)	—			(15,132		)
Acquisition payments	—			(265,397		)	—			—			(265,397		)
Sale of subsidiary	—			40,000			—			—			40,000
Advances to subsidiaries and other	—			16,431			—			3,555			19,986
Net cash used in investing activities	—			(221,869		)	(2,229		)	3,555			(220,543		)
Financing activities:
Net borrowings (repayments)	92,350			(58,894		)	3,555			(3,555		)	33,456
Equity transactions	4,333			—			—			—			4,333
Other	—			(5,398		)	(1,756		)	—			(7,154		)
Net cash provided (used) by financing activities	96,683			(64,292		)	1,799			(3,555		)	30,635
Effect of exchange rate changes on cash and cash equivalents	—			—			3,873			—			3,873
Net change in cash and cash equivalents	(2		)	15,417			(74,167		)	—			(58,752		)
Cash and cash equivalents at the beginning of year	3			16,924			95,402			—			112,329
Cash and cash equivalents at the end of period	$	1		$	32,341		$	21,235		$	—		$	53,577

The Company has revised the condensed consolidating statement of cash flows of WESCO Distribution, Inc. The revised statements present cash paid for acquisitions of $40.3 million for the year ended December 31, 2011 as intercompany loans to Non-Guarantor Subsidiaries. These payments represent acquisitions made by the Non-Guarantor subsidiaries that were funded by WECSO Distribution, Inc.  Such transactions have now been revised to reflect an investing cash outflow and a corresponding intercompany borrowing from WESCO Distribution, Inc as a financing cash inflow in the statement of cash flows of the Non-Guarantor Subsidiaries.  The impact of such revision, which the Company has determined was not material, did not have any impact on the consolidated amounts, nor did it impact the Company's obligations under the 2029 Debentures.  The prior period quarterly condensed consolidating financial statements will be similarly revised as the information is presented in our Form 10-Q filings in fiscal year 2013.

The condensed consolidating financial information was also revised to properly reflect interest expense related to intercompany borrowings in the amount of $4.9 million and $5.5 million for the years ended December 31, 2011 and 2010, respectively.

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EARNINGS PER SHARE - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Net Income	$ 26,510		$ 63,415		$ 58,874		$ 52,978		$ 54,849		$ 53,890		$ 50,207		$ 37,305		$ 201,777	$ 196,251	$ 115,477
Weighted average common shares outstanding used in computing basic earnings per share																	43,677	43,220	42,499
Common shares issuable upon exercise of dilutive stock options																	1,147	1,179	840
Common shares issuable from contingently convertible debentures																	6,310	5,224	2,774
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share																	51,133	49,623	46,113
Earnings Per Share attributable to WESCO International, Inc.
Basic	$ 0.60	[1]	$ 1.45	[1]	$ 1.35	[1]	$ 1.22	[1]	$ 1.27	[1]	$ 1.24	[1]	$ 1.16	[1]	$ 0.87	[1]	$ 4.62	$ 4.54	$ 2.72
Diluted	$ 0.52	[2]	$ 1.25	[2]	$ 1.15	[2]	$ 1.03	[2]	$ 1.12	[2]	$ 1.11	[2]	$ 1.00	[2]	$ 0.74	[2]	$ 3.95	$ 3.96	$ 2.50

[1] (A) Earnings per share (EPS) in each quarter is computed using the weighted average number of shares outstanding during the quarter while EPS for the full year is computed by taking the average of the weighted average number of shares outstanding each quarter. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.

[2] (B) Diluted EPS in each quarter is computed using the weighted average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by taking the average of the weighted average number of shares outstanding and common share equivalents each quarter. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 23, 2010
Operating Activities:
Net income	$ 201,759	$ 196,240	$ 115,477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,561	31,607	23,935
Stock-based compensation expense	15,088	15,407	15,752
Amortization of debt issuance costs	2,655	4,435	2,584
Amortization of debt discount	2,260	2,499	4,262
Loss on debt extinguishment	(1,595)	0	0
(Gain) loss on sale of property, buildings and equipment	(546)	304	(224)
Asset impairment charge	0	0	3,793
Equity income, net of distributions in 2010 of $1,864	0	0	(2,420)
Excess tax benefit from stock-based compensation	(11,358)	(5,408)	(3,217)
Interest related to uncertain tax positions	(3,371)	1,901	4,980
Deferred income taxes	17,685	14,373	20,982
Changes in assets and liabilities
Trade and other receivables, net	36,415	(143,491)	(118,478)
Inventories, net	(29,339)	(33,769)	(33,956)
Prepaid expenses and other current assets	19,588	11,268	12,641
Accounts payable	(24,346)	101,677	53,902
Accrued payroll and benefit costs	(2,498)	9,988	34,422
Other current and noncurrent liabilities	25,036	(39,498)	(7,152)
Net cash provided by operating activities	288,184	167,533	127,283
Investing Activities:
Capital expenditures	(23,084)	(33,347)	(15,132)
Acquisition payments, net of cash acquired	(1,289,480)	(48,093)	(265,397)
Proceeds from sale of subsidiary	0	0	40,000
Equity distribution	0	0	4,054
Collection of note receivable	0	0	15,000
Proceeds from sale of assets	1,558	97	932
Net cash used in investing activities	(1,311,006)	(81,343)	(220,543)
Financing Activities:
Proceeds from issuance of short-term debt	24,569	0	0
Repayments of short-term debt	(9,969)	0	0
Proceeds from issuance of long-term debt	2,299,797	648,557	1,454,479
Repayments of long-term debt	(1,244,030)	(730,897)	(1,419,526)
Debt issuance costs	(17,757)	(4,703)	(2,553)
Proceeds from the exercise of stock options	3,174	419	1,771
Excess tax benefit from stock-based compensation	11,358	5,408	3,217
Repurchase of common stock	(12,280)	(7,840)	(655)
Decrease (increase) in bank overdrafts	(8,283)	19,899	(4,601)
Payments on capital lease obligations	(2,531)	(1,751)	(1,497)
Net cash provided (used) by financing activities	1,044,048	(70,908)	30,635
Effect of exchange rate on cash and cash equivalents	1,004	(4,990)	3,873
Net change in cash and cash equivalents	22,230	10,292	(58,752)
Cash and cash equivalents at the beginning of period	63,869	53,577	112,329
Cash and cash equivalents at the end of period	86,099	63,869
Supplemental disclosures:
Cash paid for interest	43,713	43,446	46,899
Cash paid for taxes	51,733	79,189	11,044
Non-cash investing and financing activities:
Property, buildings and equipment acquired through capital leases	$ 3,216	$ 1,112	$ 301

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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 17,242,000	$ 21,590,000
Long-term debt, net of discount	$ 183,644,000	$ 175,908,000
Common stock, par value	$ 0.01
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares outstanding	18,102,528	17,936,923
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	210,000,000	210,000,000
Common stock, shares issued	57,824,548	57,021,523
Common stock, shares outstanding	44,061,451	43,424,031
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	4,339,431	4,339,431
Common stock, shares outstanding	0	0

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EQUITY INVESTMENT

12 Months Ended

Dec. 31, 2012

Equity Method Investments and Joint Ventures [Abstract]

EQUITY INVESTMENT

EQUITY INVESTMENT

During the first quarter of 2008, WESCO and Deutsch Engineered Connecting Devices, Inc. (“Deutsch”) completed a transaction with respect to WESCO’s LADD operations, which resulted in a joint venture in which Deutsch owned a 60% interest and WESCO owned a 40% interest. WESCO accounted for its investment in the joint venture using the equity method of accounting. Accordingly, earnings from the joint venture were recorded as other income in the consolidated statement of income. Deutsch was entitled, but not obliged, to acquire the remaining 40% after January 1, 2010. Deutsch paid to WESCO aggregate consideration of approximately $75.0 million, consisting of $60.0 million in cash plus a $15.0 million promissory note for its 60% interest in the joint venture.

On January 15, 2010, WESCO received $1.8 million in accrued interest related to the promissory note for the period from January 2, 2008 to January 2, 2010. In addition, Deutsch and WESCO entered into an amended promissory note agreement. The amendment extended the maturity date for the payment of principal and interest to the earlier of (a) the closing date of Deutsch’s option to acquire the remaining 40% joint venture interest or (b) the maturity date of Deutsch’s credit facility or mezzanine financing facility. Interest accrued at a rate of 8.5% compounded annually. Management believed this rate was commensurate with a market rate of interest; therefore, no reserve or allowance was recorded against the promissory note.

On April 30, 2010, Deutsch notified WESCO it would exercise its option to purchase the remaining 40% of the LADD joint venture. The option price for Deutsch to acquire the remaining 40% of the joint venture was determined based upon a multiple of trailing earnings, with a minimum purchase price of $40.0 million and maximum purchase price of $50.0 million. The investment in the LADD joint venture at March 31, 2010 was $43.4 million, and the estimated option exercise price was $40.0 million. As a result, WESCO recorded a pre-tax impairment loss of $3.4 million to selling, general and administrative expenses during the first quarter of 2010. On June 7, 2010, WESCO completed the sale of its 40% interest in the LADD joint venture and recorded an additional impairment charge of $0.4 million to selling, general and administrative expenses. WESCO received $40.0 million for its 40% interest plus $15.0 million for the outstanding promissory note and $0.5 million for accrued interest.

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SELECTED QUARTERLY FINANCIAL DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 23, 2010	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,644,363		$ 1,656,186		$ 1,672,734		$ 1,606,018		$ 1,589,522		$ 1,580,376		$ 1,524,515		$ 1,431,305		$ 6,579,301	$ 6,125,718		$ 5,063,862
Cost of goods sold	1,307,093		1,317,432		1,337,062		1,286,268		1,261,483		1,264,745		1,217,666		1,145,255		5,247,855	4,889,149		4,065,425
Income from operations	50,356		103,032		96,051		83,532		91,486		91,752		84,996		64,745		332,871	332,979		210,919
Income before income taxes	32,117		90,378		84,574		74,570		79,534		76,673		71,065		52,104		281,639	279,376		157,641
Net income	26,496		63,391		58,932		52,940		54,838		53,890		50,207		37,305		201,759	196,240	115,477	115,477
Net Income attributable to WESCO International, Inc.	$ 26,510		$ 63,415		$ 58,874		$ 52,978		$ 54,849		$ 53,890		$ 50,207		$ 37,305		$ 201,777	$ 196,251		$ 115,477
Basic earnings per share attributable to WESCO International, Inc.	$ 0.60	[1]	$ 1.45	[1]	$ 1.35	[1]	$ 1.22	[1]	$ 1.27	[1]	$ 1.24	[1]	$ 1.16	[1]	$ 0.87	[1]	$ 4.62	$ 4.54		$ 2.72
Diluted earnings per share attributable to WESCO International, Inc.	$ 0.52	[2]	$ 1.25	[2]	$ 1.15	[2]	$ 1.03	[2]	$ 1.12	[2]	$ 1.11	[2]	$ 1.00	[2]	$ 0.74	[2]	$ 3.95	$ 3.96		$ 2.50

[1] (A) Earnings per share (EPS) in each quarter is computed using the weighted average number of shares outstanding during the quarter while EPS for the full year is computed by taking the average of the weighted average number of shares outstanding each quarter. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.

[2] (B) Diluted EPS in each quarter is computed using the weighted average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by taking the average of the weighted average number of shares outstanding and common share equivalents each quarter. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.

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OTHER FINANCIAL INFORMATION - CONDENSED CONSOLIDATED INCOME STATEMENT (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 23, 2010	Dec. 31, 2010
Condensed Financial Information
Net sales	$ 1,644,363	$ 1,656,186	$ 1,672,734	$ 1,606,018	$ 1,589,522	$ 1,580,376	$ 1,524,515	$ 1,431,305	$ 6,579,301	$ 6,125,718		$ 5,063,862
Cost of goods sold	1,307,093	1,317,432	1,337,062	1,286,268	1,261,483	1,264,745	1,217,666	1,145,255	5,247,855	4,889,149		4,065,425
Selling, general and administrative expense									961,014	871,983		763,583
Depreciation and amortization									37,561	31,607	23,935	23,935
Results of affiliates' operations									0	0		0
Interest expense, net									47,762	53,603		57,563
Loss on debt extinguishment									3,470	0		0
Other income												4,285
Provision for income taxes									79,880	83,136		42,164
Net income (loss)	26,496	63,391	58,932	52,940	54,838	53,890	50,207	37,305	201,759	196,240	115,477	115,477
Net loss attributable to noncontrolling interest									(18)	(11)		0
Net Income attributable to WESCO International, Inc.	26,510	63,415	58,874	52,978	54,849	53,890	50,207	37,305	201,777	196,251		115,477
Parent Company
Condensed Financial Information
Net sales									0	0		0
Cost of goods sold									0	0		0
Selling, general and administrative expense									59	70		234
Depreciation and amortization									0	0		0
Results of affiliates' operations									235,467	229,621		153,107
Interest expense, net									23,163	23,990		27,565
Loss on debt extinguishment									0
Other income												0
Provision for income taxes									10,486	9,321		9,831
Net income (loss)									201,759	196,240
Net loss attributable to noncontrolling interest									0	0
Net Income attributable to WESCO International, Inc.									201,759	196,240		115,477
Guarantor Subsidiaries
Condensed Financial Information
Net sales									3,442,714	3,230,753		2,820,855
Cost of goods sold									2,738,941	2,585,978		2,262,038
Selling, general and administrative expense									593,400	546,902		518,100
Depreciation and amortization									15,208	11,996		12,581
Results of affiliates' operations									184,947	176,581		130,267
Interest expense, net									17,683	21,382		22,291
Loss on debt extinguishment									3,470
Other income												(4,285)
Provision for income taxes									23,493	11,455		(12,708)
Net income (loss)									235,466	229,621
Net loss attributable to noncontrolling interest									0	0
Net Income attributable to WESCO International, Inc.									235,466	229,621		153,105
Non-Guarantor Subsidiaries
Condensed Financial Information
Net sales									3,265,007	2,998,639		2,318,495
Cost of goods sold									2,637,334	2,406,845		1,878,875
Selling, general and administrative expense									367,555	325,011		245,249
Depreciation and amortization									22,353	19,611		11,354
Results of affiliates' operations									0	0		0
Interest expense, net									6,916	8,231		7,707
Loss on debt extinguishment									0
Other income												0
Provision for income taxes									45,901	62,360		45,041
Net income (loss)									184,948	176,581
Net loss attributable to noncontrolling interest									(18)	(11)
Net Income attributable to WESCO International, Inc.									184,966	176,592		130,269
Consolidation, Eliminations
Condensed Financial Information
Net sales									(128,420)	(103,674)		(75,488)
Cost of goods sold									(128,420)	(103,674)		(75,488)
Selling, general and administrative expense									0	0		0
Depreciation and amortization									0	0		0
Results of affiliates' operations									(420,414)	(406,202)		(283,374)
Interest expense, net									0	0		0
Loss on debt extinguishment									0
Other income												0
Provision for income taxes									0	0		0
Net income (loss)									(420,414)	(406,202)
Net loss attributable to noncontrolling interest									0	0
Net Income attributable to WESCO International, Inc.									$ (420,414)	$ (406,202)		$ (283,374)

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Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2012	Feb. 26, 2013	Jun. 30, 2012
Entity Information [Line Items]
Entity Registrant Name	WESCO INTERNATIONAL INC.
Entity Central Index Key	0000929008
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		44,087,890
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,497,849,556

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INCOME TAXES

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The following table sets forth the components of the provision for income taxes:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
Current taxes:
Federal(1)	$	51,132	$	60,415	$	11,363
State	6,006		5,705		2,018
Foreign	5,079		2,643		7,801
Total current	62,217		68,763		21,182
Deferred taxes:
Federal	15,034		9,692		21,069
State	1,080		2,187		1,112
Foreign	1,549		2,494		(1,199		)
Total deferred	17,663		14,373		20,982
	$	79,880	$	83,136	$	42,164

_________________________

⁽¹⁾  Tax benefits related to stock options and other equity instruments recorded directly to additional paid in capital totaled $11.3 million, $5.6 million and $8.2 million in 2012, 2011 and 2010, respectively.

The following table sets forth the components of income before income taxes by jurisdiction:

	Year Ended December 31
	2012		2011		2010
			(In thousands)
United States	$	255,700	$	260,859	$	166,108
Foreign	25,938		18,517		(8,467		)
	$	281,639	$	279,376	$	157,641

The following table sets forth the reconciliation between the federal statutory income tax rate and the effective rate:

	Year Ended December 31
	2012		2011		2010
Federal statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal tax benefit	1.8		2.1		1.5
Nondeductible expenses	1.0		0.7		1.3
Domestic tax benefit from foreign operations	(0.2	)	—		(0.3	)
Foreign tax rate differences	(0.9	)	(0.8	)	0.2
Tax effect of intercompany financing	(6.3	)	(6.1	)	(10.6	)
Federal tax credits	—		(0.1	)	(0.1	)
Domestic production activity deduction	(0.5	)	(0.5	)	(0.5	)
Adjustment related to uncertain tax positions	(0.6	)	(0.7	)	(4.2	)
Revaluation of deferred tax items	(0.1	)	0.4		1.9
Other	(0.8	)	(0.2	)	2.5
	28.4	%	29.8	%	26.7	%

As of December 31, 2012, WESCO had approximately $323.5 million of undistributed earnings related to its foreign subsidiaries. Management believes that these earnings will be indefinitely reinvested in foreign jurisdiction; accordingly, WESCO has not provided for U.S. federal income taxes related to these earnings.

The following table sets forth deferred tax assets and liabilities:

	December 31
	2012				2011
			(In thousands)
	Assets		Liabilities		Assets		Liabilities
Accounts receivable	$	2,518	$	—	$	4,015	$	—
Inventory	—		4,412		—		6,515
Depreciation	—		13,423		—		6,064
Amortization of intangible assets	—		242,745		—		162,675
Convertible debt interest	—		105,871		—		93,736
Employee benefits	40,485		—		30,454		—
Tax loss carryforwards	23,289		—		24,232		—
Other	50,723		8,558		37,529		3,938
Total deferred taxes	$	117,015	$	375,009	$	96,230	$	272,928

As of December 31, 2012 and 2011, WESCO had state tax benefits derived from net operating loss carryforwards of approximately $6.7 million ($4.4 million, net of federal income tax) and $6.3 million ($4.0 million, net of federal income tax), respectively. In addition, WESCO had tax benefits from net operating losses resulting from the recapitalization of its Canadian operations of $18.9 million and $20.2 million, respectively. The amounts will begin expiring in 2013 and 2027, respectively. Utilization of WESCO’s state net operating loss carryforwards is subject to annual limitations imposed by state statute. Such annual limitations could result in the expiration of the net operating loss and tax credit carryforwards before utilization. Management anticipates utilizing the net operating losses prior to the expiration of statutes of limitations; accordingly, WESCO has not recorded a valuation allowance.

WESCO analyzes its filing positions for all open tax years in all jurisdictions. The Company is currently under examination in several tax jurisdictions, both within the United States and outside the United States, and remains subject to examination until the statute of limitations expires for the respective tax jurisdictions. The following summary sets forth the tax years that remain open in the Company’s major tax jurisdictions:

United States — Federal	2000 and forward *
United States — States	2007 and forward
Canada	2003 and forward

* Open by waiver of statute only.

The following table sets forth the reconciliation of gross unrecognized tax benefits:

	December 31,
	2012			2011			2010
	(In thousands)
Beginning balance January 1	$	20,878		$	3,394		$	8,085
Additions based on tax positions related to the current year	929			265			1,439
Additions for tax positions of prior years(1)	1,224			20,064			4,668
Additions for acquired tax positions	1,825			—			—
Reductions for tax positions of prior years	(85		)	(2,161		)	(8,818		)
Settlements	(3,400		)	(512		)	(1,368		)
Lapse in statute of limitations	(296		)	(172		)	(612		)
Ending balance December 31	$	21,075		$	20,878		$	3,394

_________________________

⁽¹⁾     In 2011, additions for tax positions of prior years primarily relate to transfer pricing issues between the United States

and Canada, which are under review by the Canadian Competent Authority. A corresponding deferred tax asset in the amount of $23.1 million excluding interest has been recorded for the position in the United States.

The total amount of unrecognized tax benefits were $21.1 million, $20.9 million and $3.4 million as of December 31, 2012, 2011 and 2010, respectively. If these tax benefits were recognized in the consolidated financial statements, the portion of these amounts that would reduce the Company’s tax provision would be $21.2 million, $19.7 million, and $1.9 million respectively. The amount in 2012 would be offset by the corresponding deferred tax asset discussed above.

During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits will decrease by as much as $14.7 million ($12.2 million of which will be offset by the reversal of a deferred tax asset) due to certain issues being settled by the resolution of federal, state and/or foreign tax examinations and/or the expiration of statutes of limitations. Management does not expect this decrease to have an impact on the effective tax rate.

WESCO records interest related to uncertain tax positions as a part of interest expense in the consolidated statement of income. Any penalties are recognized as part of income tax expense. Penalties recorded to income tax expense were immaterial for 2012, 2011 and 2010. As of December 31, 2012 and 2011, WESCO had an accrued liability of $8.0 million and $11.4 million, respectively, for interest related to uncertain tax positions. During 2012 accrued interest decreased by $3.4 million primarily as a result of a favorable Internal Revenue Service appeals settlement in the first quarter related to the years 2000 to 2006.

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STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010
Share Based Compensation Arrangements By Share Based Payment Award, Options and Stock Appreciation Rights Outstanding [Roll Forward]
Beginning of Year, Shares	4,266,533	4,498,303	4,226,153
Grants in Period, Shares	257,932	399,260	708,949
Exercises in Period, Shares	(1,340,986)	(543,154)	(335,155)
Forfeitures in Period, Shares	(41,458)	(87,876)	(101,644)
Exercisable, Shares	2,450,391	3,176,161	3,011,120
End of Year, Shares	3,142,021	4,266,533	4,498,303
Weighted Average Exercise Price, Beginning of Year	$ 39.64	$ 36.38	$ 35.30
Weighted Average Exercise Price, Grants In Period	$ 64.12	$ 59.16	$ 33.19
Weighted Average Exercise Price, Exercises In Period	$ 30.54	$ 25.83	$ 14.79
Weighted Average Exercise Price, Forfeitures In Period	$ 49.96	$ 46.86	$ 40.62
Weighted Average Exercise Price, Exercisable	$ 43.16	$ 39.23	$ 38.65
Weighted Average Exercise Price, End of Year	$ 45.40	$ 39.64	$ 36.38
Weighted Average Remaining Contractual Term, Outstanding	5.8
Weighted Average Remaining Contractual Term, Exercisable	5.1
Aggregate Intrinsic Value, Outstanding	$ 53,058
Aggregate Intrinsic Value, Exercisable	$ 46,898

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OTHER FINANCIAL INFORMATION - CONDENSED CONSOLIDATED BALANCE SHEETS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Information
Cash and cash equivalents	$ 86,099	$ 63,869	$ 53,577	$ 112,329
Trade accounts receivable	1,036,235	939,422
Inventories, net	793,974	626,967
Other current assets	185,529	107,162
Total current assets	2,101,837	1,737,420
Intercompany receivables, net	0	0
Property, building and equipment, net	210,723	133,550
Intangible assets, net	496,761	156,874
Goodwill and other intangibles, net	1,777,797	1,008,127	985,714
Investments in affiliates and other noncurrent assets	42,511	42,481
Total assets	4,629,629	3,078,452
Accounts payable	706,580	642,777
Short-term debt	30,136	0
Other current liabilities	271,279	203,069
Total current liabilities	1,007,995	845,846
Intercompany payables, net	0	0
Long-term debt	1,695,413	642,922
Other noncurrent liabilities	372,530	243,774
Stockholders’ equity	1,553,691	1,345,910
Total liabilities and stockholders' equity	4,629,629	3,078,452
Parent Company
Condensed Financial Information
Cash and cash equivalents	6	5	1	3
Trade accounts receivable	0	0
Inventories, net	0	0
Other current assets	0	270
Total current assets	6	275
Intercompany receivables, net	0	0
Property, building and equipment, net	0	0
Intangible assets, net	0	0
Goodwill and other intangibles, net	0	0
Investments in affiliates and other noncurrent assets	2,443,259	2,219,142
Total assets	2,443,265	2,219,417
Accounts payable	0	0
Short-term debt	0
Other current liabilities	18,419	7,797
Total current liabilities	18,419	7,797
Intercompany payables, net	671,736	668,447
Long-term debt	171,213	169,054
Other noncurrent liabilities	28,099	28,131
Stockholders’ equity	1,553,798	1,345,988
Total liabilities and stockholders' equity	2,443,265	2,219,417
Guarantor Subsidiaries
Condensed Financial Information
Cash and cash equivalents	52,275	44,412	32,341	16,924
Trade accounts receivable	0	0
Inventories, net	347,008	341,423
Other current assets	66,106	32,548
Total current assets	465,389	418,383
Intercompany receivables, net	0	0
Property, building and equipment, net	58,523	54,038
Intangible assets, net	6,153	6,981
Goodwill and other intangibles, net	246,125	246,125
Investments in affiliates and other noncurrent assets	3,607,616	3,415,896
Total assets	4,383,806	4,141,423
Accounts payable	401,016	423,509
Short-term debt	0
Other current liabilities	100,956	4,809
Total current liabilities	501,972	428,318
Intercompany payables, net	405,265	1,147,622
Long-term debt	847,761	188,081
Other noncurrent liabilities	190,294	163,177
Stockholders’ equity	2,438,514	2,214,225
Total liabilities and stockholders' equity	4,383,806	4,141,423
Non-Guarantor Subsidiaries
Condensed Financial Information
Cash and cash equivalents	33,818	19,452	21,235	95,402
Trade accounts receivable	1,036,235	939,422
Inventories, net	446,966	285,544
Other current assets	119,423	74,344
Total current assets	1,636,442	1,318,762
Intercompany receivables, net	1,077,001	1,816,069
Property, building and equipment, net	152,200	79,512
Intangible assets, net	490,608	149,893
Goodwill and other intangibles, net	1,531,672	762,002
Investments in affiliates and other noncurrent assets	20,997	31,745
Total assets	4,908,920	4,157,983
Accounts payable	305,564	219,268
Short-term debt	30,136
Other current liabilities	151,904	190,463
Total current liabilities	487,604	409,731
Intercompany payables, net	0	0
Long-term debt	676,439	285,787
Other noncurrent liabilities	154,137	52,466
Stockholders’ equity	3,590,740	3,409,999
Total liabilities and stockholders' equity	4,908,920	4,157,983
Consolidation, Eliminations
Condensed Financial Information
Cash and cash equivalents	0	0	0	0
Trade accounts receivable	0	0
Inventories, net	0	0
Other current assets	0	0
Total current assets	0	0
Intercompany receivables, net	(1,077,001)	(1,816,069)
Property, building and equipment, net	0	0
Intangible assets, net	0	0
Goodwill and other intangibles, net	0	0
Investments in affiliates and other noncurrent assets	(6,029,361)	(5,624,302)
Total assets	(7,106,362)	(7,440,371)
Accounts payable	0	0
Short-term debt	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany payables, net	(1,077,001)	(1,816,069)
Long-term debt	0	0
Other noncurrent liabilities	0	0
Stockholders’ equity	(6,029,361)	(5,624,302)
Total liabilities and stockholders' equity	$ (7,106,362)	$ (7,440,371)

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Net sales	$ 6,579,301	$ 6,125,718	$ 5,063,862
Cost of goods sold (excluding depreciation and amortization below)	5,247,855	4,889,149	4,065,425
Selling, general and administrative expense	961,014	871,983	763,583
Depreciation and amortization	37,561	31,607	23,935
Income from operations	332,871	332,979	210,919
Interest expense, net	47,762	53,603	57,563
Loss on debt extinguishment	3,470	0	0
Other income	0	0	(4,285)
Income before income taxes	281,639	279,376	157,641
Provision for income taxes	79,880	83,136	42,164
Net income	201,759	196,240	115,477
Net loss attributable to noncontrolling interest	(18)	(11)	0
Net Income attributable to WESCO International, Inc.	201,777	196,251	115,477
Comprehensive Income:
Foreign currency translation adjustment	(9,013)	(12,576)	11,648
Comprehensive income attributable to WESCO International, Inc.	$ 192,764	$ 183,675	$ 127,125
Earnings per share :
Basic	$ 4.62	$ 4.54	$ 2.72
Diluted	$ 3.95	$ 3.96	$ 2.50

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CONCENTRATIONS OF CREDIT RISK AND SIGNIFICANT SUPPLIERS

12 Months Ended

Dec. 31, 2012

Risks and Uncertainties [Abstract]

CONCENTRATIONS OF CREDIT RISK AND SIGNIFICANT SUPPLIERS

CONCENTRATIONS OF CREDIT RISK AND SIGNIFICANT SUPPLIERS

WESCO distributes its products and services and extends credit to a large number of customers in the industrial, construction, utility, commercial, institutional, and governmental markets. WESCO’s largest supplier accounted for approximately 12% of WESCO's purchases in 2012, 10% of purchases in 2011, and 12% of purchases in 2010, and therefore, WESCO could potentially incur risk due to supplier concentration. Based upon WESCO’s broad customer base, the Company has concluded that it has no material credit risk as a result of customer concentration.

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GOODWILL AND INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following table sets forth the changes in the carrying amount of goodwill:

	Year Ended December 31
	2012			2011
	(In thousands)
Beginning balance January 1	$	1,008,127		$	985,714
Translation adjustments	(15,592		)	(3,597		)
Additions to goodwill for acquisitions	785,262			26,010
Ending balance December 31	$	1,777,797		$	1,008,127

WESCO has never recorded an impairment loss related to goodwill or intangible assets.

Intangible Assets

The components of intangible assets are as follows:

	December 31, 2012								December 31, 2011
	Life	Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount		Gross Carrying Amount(1)		Accumulated Amortization(1)			Net Carrying Amount
	(In thousands)
Intangible assets:
Trademarks	Indefinite	$	105,080	$	—		$	105,080	$	46,852	$	—		$	46,852
Trademarks	4-15	1,734		(106		)	1,628		—		—			—
Non-compete agreements	5-7	1,950		(1,858		)	92		1,252		(1,038		)	214
Customer relationships	4-20	362,794		(40,094		)	322,700		70,670		(32,527		)	38,143
Distribution agreements	10-19	38,119		(9,298		)	28,821		35,291		(6,897		)	28,394
Patents	10	48,310		(9,870		)	38,440		48,310		(5,039		)	43,271
		$	557,987	$	(61,226	)	$	496,761	$	202,375	$	(45,501	)	$	156,874

_________________________

⁽¹⁾  Excludes the original cost and accumulated amortization of fully-amortized intangibles.

Amortization expense related to intangible assets totaled $15.1 million, $13.4 million and $7.5 million for the years ended December 31, 2012, 2011 and 2010, respectively.

The following table sets forth the estimated amortization expense for intangibles for the next five years (in thousands):

	Estimated
	Amortization
For the year ended December 31,	Expense
2013	$	39,239
2014	38,014
2015	36,075
2016	34,889
2017	33,895

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SEGMENTS AND RELATED INFORMATION

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

SEGMENTS AND RELATED INFORMATION

SEGMENTS AND RELATED INFORMATION

WESCO provides distribution of product and services through its eleven operating segments which have been aggregated as one reportable segment. WESCO has over 250,000 unique product stock keeping units and markets more than 1,000,000 products for customers. There were no material amounts of sales or transfers among geographic areas and no material amounts of export sales.

WESCO attributes revenues from external customers to individual countries on the basis of the point of sale. The following table sets forth information about WESCO by geographic area:

	Net Sales Year Ended December 31,												Long-Lived Assets December 31,
(In thousands)	2012				2011				2010				2012		2011		2010
United States	$	5,216	79	%	$	4,994,641	82	%	$	4,198,420	83	%	$	144,947	$	131,989	$	117,768
Canada	1,084		17	%	900,551		15	%	682,415		13	%	100,366		24,609		12,446
Mexico	92		1	%	84,871		1	%	51,413		1	%	532		572		641
Subtotal North American Operations	6,392				5,980,063				4,932,248				245,845		157,170		130,855
Other Foreign	187		3	%	145,655		2	%	131,614		3	%	6,049		771		325
Total U.S. and Foreign	$	6,579,301			$	6,125,718			$	5,063,862			$	251,894	$	157,941	$	131,180

The following table sets forth sales information about WESCO’s sales by product category:

Year Ended December 31,	2012	2011	2010
(percentages based on total sales)
General and Industrial Supplies	36%	34%	35%
Wire, Cable and Conduit	17%	18%	18%
Data and Broadband Communications	15%	17%	15%
Power Distribution Equipment	13%	11%	12%
Lighting and Controls	9%	9%	10%
Control, Automation and Motors	10%	11%	10%

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EARNINGS PER SHARE EARNINGS PER SHARE

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

Basic earnings per share are computed by dividing net income by the weighted average common shares outstanding during the periods. Diluted earnings per share are computed by dividing net income by the weighted average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of stock-based compensation.

The following table sets forth the details of basic and diluted earnings per share:

	Year Ended December 31
	2012		2011		2010
(In thousands, except per share data)
Net income	$	201,777	$	196,251	$	115,477
Weighted average common shares outstanding used in computing basic earnings per share	43,677		43,220		42,499
Common shares issuable upon exercise of dilutive stock options	1,147		1,179		840
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,310		5,224		2,774
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,133		49,623		46,113
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.62	$	4.54	$	2.72
Diluted	$	3.95	$	3.96	$	2.50

As of December 31, 2012, 2011 and 2010, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded stock-settled stock appreciation rights of approximately 0.9 million, 1.2 million and 2.4 million at weighted average exercise prices of $64.17 per share, $62.48 per share and $46.73 per share, respectively. These amounts were excluded because their effect would have been antidilutive.

Because of WESCO’s obligation to settle the par value of the 2029 Debentures in cash, WESCO is not required to include any shares underlying the 2029 Debentures in its diluted weighted average shares outstanding until the average stock price per share for the period exceeds the conversion price of the 2029 Debentures. At such time, only the number of shares that would be issuable (under the treasury stock method of accounting for share dilution) will be included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion price of the 2029 Debentures is $28.87. Share dilution is limited to a maximum of 11,949,205 shares for the 2029 Debentures. For the periods ended December 31, 2012, 2011, and 2010, the effect of the 2029 Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.56 , $0.47, and $0.16, respectively.

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COMMITMENTS AND CONTINGENCIES - COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 50.0	$ 48.0	$ 45.4
Loss Contingency, Damages Sought, Value	50
Loss Contingency, Loss in Period	$ 36

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DEBT

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

DEBT

DEBT

The following table sets forth WESCO’s outstanding indebtedness:

	As of December 31,
	2012			2011
	(In thousands)
Term Loan Facility, less debt discount of $9,936	$	840,827		$	—
Mortgage financing facility	26,414			37,564
Accounts receivable securitization facility	445,000			250,000
Revolving credit facility	218,295			36,792
7.50% Senior Subordinated Notes due 2017	—			150,000
Foreign lines of credit	30,136			3,261
1.75% Convertible Senior Debentures due 2026, less debt discount of $0 in 2012 and 2011	—			56
6.0% Convertible Senior Debentures due 2029, less debt discount of $173,708 and $175,908 in 2012 and 2011, respectively	171,213			169,054
Capital leases	3,220			2,521
Other notes	67			85
Total debt	1,735,172			649,333
Less current and short-term portion	(39,759		)	(6,411		)
Total long-term debt	$	1,695,413		$	642,922

Term Loan Facility

On December 12, 2012, WESCO Distribution, as U.S. borrower, WDCC (WDCC and together with WESCO Distribution, the “Borrowers”), as Canadian borrower, and WESCO International entered into a Term Loan Agreement (the “Term Loan Agreement”) among WESCO Distribution, WDCC, the Company, the lenders party thereto and Credit Suisse AG Cayman Islands Branch, as administrative agent and as collateral agent.

The Term Loan Agreement provides for a seven-year term loan facility (the “Term Loan Facility”), which consists of two separate sub-facilities: (i) a Canadian sub-facility in an aggregate principal amount of CAD $150.0 million, issued at a 2.0% discount, and (ii) a U.S. sub-facility in an aggregate principal amount of US $700.0 million, issued at a 1.0% discount. WESCO is amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $0.1 million was recorded for the year ended December 31, 2012. The debt discount amortization will be $1.4 million annually.

Subject to the terms of the Term Loan Facility, the Borrowers may request incremental term loans thereunder from time to time in an aggregate principal amount not to exceed at any time US $300.0 million, with an equivalent principal amount in U.S. Dollars being calculated for any incremental term loan denominated in Canadian Dollars, in order to finance certain permitted acquisitions. The proceeds of the Term Loan Facility were used to finance the acquisition of EECOL, to pay fees and expenses incurred in connection with the acquisition and certain other transactions. At December 31, 2012, WESCO had a balance outstanding under the facility of US $850.8 million.

Borrowings under the Term Loan Facility bear interest at base rates plus applicable margins. At December 31, 2012, the interest rates on borrowings under the Canadian sub-facility and U.S. sub-facility were approximately 5.2% and 4.5%, respectively. The Borrowers will pay quarterly installments of principal equal to 0.25% of the original principal amount of their respective term loans, plus accrued and unpaid interest, beginning on March 31, 2013. To the extent not previously paid, the term loans will become due and payable on December 12, 2019, with any unpaid incremental term loans becoming due and payable on the respective maturity dates applicable to those incremental term loans. Other than in certain circumstances prior to the first anniversary of the closing of the Term Loan Facility, at any time or from time to time, the Borrowers may prepay borrowings under the Term Loan Facility in whole or in part without premium or penalty. The Borrowers' obligations under the Term Loan Facility are secured by substantially all of the assets of the Borrowers, the Company and certain of the Company's other subsidiaries; provided that, with respect to borrowings under the U.S. sub-facility, the collateral does not include assets of certain foreign subsidiaries or more than sixty-five percent of the issued and outstanding equity interests in certain foreign subsidiaries.

The Term Loan Facility contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Term Loan Parties with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. The Term Loan Facility also provides for customary events of default.

Mortgage Financing Facility

In 2003, WESCO finalized a mortgage financing facility of $51 million, of which $26.4 million was outstanding as of December 31, 2012. Total borrowings under the mortgage financing facility are subject to a 22-year amortization schedule, with a balloon payment due during the first quarter of 2013. The interest rate on borrowings under this facility is fixed at 6.5%. The Company's intent is to pay the 2013 obligations of 26.4 million utilizing the Revolving Credit Facility and therefore this facility is classified as long-term.

Accounts Receivable Securitization Facility

On December 11, 2012, WESCO Distribution entered into an amendment of the Receivables Facility pursuant to the terms and conditions of a Seventh Amendment to Third Amended and Restated Receivables Purchase Agreement, dated as of December 11, 2012 (the “Amendment”), by and among WESCO Receivables Corp. (“WESCO Receivables”), WESCO Distribution, the Purchasers and Purchaser Agents party thereto and PNC Bank, National Association, as Administrator. The Amendment, among other things, added certain defined terms and amended certain other terms such as change in control, excluded receivables, and an intercreditor agreement. Substantially all other terms and conditions of the Receivables Facility remain unchanged. In addition, on December 11, 2012, WESCO Distribution and WESCO Receivables exercised an existing accordion feature under the Receivables Facility to increase the purchasing limit thereunder from $450.0 million to $475.0 million. The Receivables Facility matures in August 2014.

Under the Receivables Facility, WESCO sells, on a continuous basis, an undivided interest in all domestic accounts receivable to WESCO Receivables Corp., a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to third-party conduits and financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. WESCO has agreed to continue servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.

As of December 31, 2012 and 2011, accounts receivable eligible for securitization totaled approximately $601.1 million and $613.9 million, respectively. The consolidated balance sheets as of December 31, 2012 and 2011 include $445.0 million and $250.0 million, respectively, of account receivable balances legally sold to third parties, as well as borrowings for equal amounts. At December 31, 2012, the interest rate on borrowings under this facility was approximately 1.4%.

Revolving Credit Facility

On December 12, 2012, WESCO Distribution and certain other subsidiaries of the Company entered into a US $600.0 million revolving credit facility, which includes a letter of credit sub-facility of up to US $90.0 million in the aggregate, pursuant to the terms and conditions of an Amended and Restated Credit Agreement, dated as of December 12, 2012, among WESCO Distribution, the other U.S. Borrowers party thereto, WESCO Distribution Canada LP (“WESCO Canada”) and WDCC Enterprises, Inc. (“WDCC), as Canadian Borrowers, the other Loan Parties party thereto, the Lenders party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and JPMorgan Chase Bank, N.A., Toronto Branch, as Canadian Administrative Agent. Upon completion of the acquisition of EECOL on December 14, 2012, EECOL was added as a Canadian Borrower. The Revolving Credit Facility contains an accordion feature allowing WESCO Distribution to request increases to the borrowing commitments under the Credit Facility of up to US $100.0 million in the aggregate. The Revolving Credit Facility replaced WESCO Distribution's US $400.0 million revolving credit facility originally entered into on August 22, 2011.

The Revolving Credit Facility matures in August 2016 and consists of two separate sub-facilities: (i) a Canadian sub-facility with a borrowing limit of up to US $400.0 million, which is collateralized by substantially all assets of WESCO Canada, WDCC and EECOL, and (ii) a U.S. sub-facility with a borrowing limit of up to US $600.0 million less the amount of outstanding borrowings under the Canadian sub-facility. The U.S. sub-facility is collateralized by substantially all assets of WESCO Distribution and its U.S. subsidiaries other than real property and accounts receivable sold or intended to be sold pursuant to the Receivables Facility. Availability under the Revolving Credit Facility is based upon the amount of eligible inventory and receivables applied against certain advance rates. The applicable interest rate for borrowings under the Revolving Credit Facility includes interest rate spreads based on available borrowing capacity that range between 1.5% and 2.0% for LIBOR-based borrowings and 0.5% and 1.0% for prime rate-based borrowings. The otherwise applicable interest rate is reduced by 0.25% if the Company's leverage ratio falls below a ratio of 2.5 to 1.0. At December 31, 2012, the interest rate on borrowings under this facility was approximately 2.5%.

The Credit Agreement contains customary affirmative and negative covenants for credit facilities of this type, including limitations on WESCO Distribution, the Company and certain of the Company's other subsidiaries with respect to indebtedness, liens, investments, mergers and acquisitions, dispositions of assets and transactions with affiliates. Subject to the terms of the Credit Agreement, the Company is permitted to pay dividends, repurchase common stock or repurchase indebtedness without limitation so long as pro forma combined availability under the Revolving Credit Facility and the Receivables Facility exceeds US $160.0 million and the adjusted fixed charge ratio is not less than a ratio of 1.1 to 1.0.

During 2012, WESCO borrowed $814.1 million in the aggregate under the Revolving Credit Facility and made repayments in the aggregate amount of $632.9 million. During 2011, aggregate borrowings and repayments were $435.7 million and $398.9 million, respectively. At December 31, 2012, WESCO had a balance outstanding of $218.3 million under the Revolving Credit facility. WESCO had $270.9 million available under the Revolving Credit facility at December 31, 2012, after giving effect to outstanding letters and foreign lines of credit, as compared to approximately $299.3 million at December 31, 2011.

7.50% Senior Subordinated Notes due 2017

On December 10, 2012, WESCO International announced that WESCO Distribution would redeem all of its outstanding 7.50% Senior Subordinated Notes due 2017 (the “2017 Notes”) on January 9, 2013 (the “Redemption Date”) at a redemption price equal to 101.25% of the principal amount thereof plus accrued and unpaid interest to, but excluding, the Redemption Date, for a total of 103% of the principal amount of 2017 Notes. The aggregate principal amount of 2017 Notes outstanding was $150.0 million. On December 11, 2012, in accordance with the terms of the Indenture, dated as of September 27, 2005, among WESCO Distribution, WESCO International and The Bank of New York Mellon, as trustee (the “Trustee”), WESCO Distribution irrevocably deposited with the Trustee funds sufficient to pay principal and interest of all outstanding 2017 Notes on the Redemption Date. As a result, the Indenture was satisfied and discharged.

Foreign Lines of Credit

Certain foreign subsidiaries of WESCO have entered into uncommitted lines of credit, which serve as overdraft facilities, to support local operations. The maximum borrowing limit varies by facility and ranges between US $0.5 million and US $8.0 million. The applicable interest rate for borrowings under these lines of credit varies by country and is governed by the applicable loan agreement. The foreign lines of credit are renewable on an annual basis and are fully and unconditionally guaranteed by WESCO Distribution. Accordingly, these lines directly reduce availability under the Revolving Credit Facility.

1.75% Convertible Senior Debentures due 2026

Proceeds of $300 million were received in connection with the issuance of the 2026 Debentures by WESCO International in November 2006. On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 1.75% Convertible Senior Debentures due 2026 (the "2026 Debentures") and 2.625% Convertible Senior Debentures due 2025 (the "2025 Debentures"), respectively (see the 6.0% Convertible Senior Debentures due 2029 discussion below for additional information). On November 30, 2011, WESCO International announced that it would redeem all of its 2026 Debentures on January 3, 2012. WESCO International redeemed the remaining $0.1 million aggregate principal amount of outstanding 2026 Debentures at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. Following the redemption on January 3, 2012, there were no 2026 Debentures outstanding.

On January 1, 2009, WESCO retrospectively applied the provisions of guidance concerning convertible debt instruments to the 2026 Debentures. WESCO utilized an interest rate of 6% to reflect the non-convertible market rate of its offering upon issuance. WESCO amortized the debt discount over a five year period starting on the date of issuance. Non-cash interest expense of less than $0.1 million was recorded for the years ended December 31, 2012 and 2011.

6.0% Convertible Senior Debentures due 2029

On August 27, 2009, WESCO International completed an exchange offer pursuant to which it issued $345.0 million in aggregate principal amount of 2029 Debentures in exchange for approximately $299.7 million and $57.7 million in aggregate principal amounts of its outstanding 2026 Debentures and 2025 Debentures, respectively. As a result of the debt exchange, WESCO recorded a gain of $6.0 million, which included the write-off of debt issuance costs. The 2029 Debentures were issued pursuant to an Indenture dated August 27, 2009 (the “Indenture”), with The Bank of New York Mellon, as trustee, and are unconditionally guaranteed on an unsecured senior subordinate basis by WESCO Distribution.

WESCO utilized an interest rate of 13.875% to reflect the non-convertible debt borrowing rate of its offering upon issuance, which was determined based on discussions with its financial institutions and a review of relevant market data, and resulted in a$181.2 million discount to the 2029 Debenture balance and a net increase in additional capital of $106.5 million. In addition, the financing costs related to the issuance of the 2029 Debentures were allocated between the debt and equity components. WESCO is amortizing the debt discount and financing costs over the life of the instrument. Non-cash interest expense of $2.2 million and $2.5 million was recorded for the years ended December 31, 2012 and 2011, respectively. The debt discount amortization will approximate $2.9 million in 2013, $3.3 million in 2014, $3.8 million in 2015, $4.3 million in 2016, and $4.9 million in 2017.

While the 2029 Debentures accrue interest at an effective interest rate of 13.875% (as described above), the coupon interest rate of 6.0% per annum is payable in cash semi-annually in arrears on each March 15 and September 15, and commenced March 15, 2010. Beginning with the six-month period commencing September 15, 2016, WESCO will also pay contingent interest in cash during any six-month period in which the trading price of the 2029 Debentures for each of the five trading days ending on the second trading day immediately preceding the first day of the applicable six-month interest period equals or exceeds 120% of the principal amount of the 2029 Debentures. During any interest period when contingent interest shall be payable, the contingent interest payable per $1,000 principal amount of 2029 Debentures will equal 0.25% of the average trading price of $1,000 principal amount of the 2029 Debentures during the five trading days immediately preceding the first day of the applicable six-month interest period. In accordance with guidance related to derivatives and hedging, the contingent interest feature of the 2029 Debentures is an embedded derivative that is not considered clearly and closely related to the host contract. The contingent interest component had no significant value at December 31, 2012 or 2011.

The 2029 Debentures are convertible into cash, and in certain circumstances, shares of WESCO International’s common stock, $0.01 par value, at any time on or after September 15, 2028, or prior to September 15, 2028 in certain circumstances. The 2029 Debentures will be convertible based on an initial conversion rate of 34.6433 shares of common stock per $1,000 principal amount of the 2029 Debentures (equivalent to an initial conversion price of approximately $28.87 per share). The conversion rate and conversion price may be adjusted under certain circumstances.

At any time on or after September 15, 2016, the Company may redeem all or a part of the 2029 Debentures plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the redemption date. If WESCO International undergoes certain fundamental changes, as defined in the Indenture, prior to maturity, holders of the 2029 Debentures will have the right, at their option, to require WESCO International to repurchase for cash some or all of their 2029 Debentures at a repurchase price equal to 100% of the principal amount of the 2029 Debentures being repurchased, plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the repurchase date.

The following table sets forth the components of WESCO’s outstanding convertible debenture indebtedness:

	December 31, 2012							December 31, 2011
	Principal Balance		Discount			Net Carrying Amount		Principal Balance		Discount			Net Carrying Amount
(In thousands)
Convertible Debentures:
2026	$	—	$	—		$	—	$	56	$	—		$	56
2029	344,921		(173,708		)	171,213		344,962		(175,908		)	169,054
	$	344,921	$	(173,708	)	$	171,213	$	345,018	$	(175,908	)	$	169,110

Covenant Compliance

WESCO was in compliance with all relevant covenants contained in its debt agreements as of December 31, 2012.

The following table sets forth the aggregate principal repayment requirements for all indebtedness for the next five years and thereafter, as of December 31, 2012:

(In thousands)
2013	$	66,173
2014	454,436
2015	9,192
2016	227,162
2017	8,691
Thereafter	1,153,162
Total payments on debt	1,918,816
Debt discount on convertible debentures and term loan facility	(183,644		)
Total long-term debt	$	1,735,172

WESCO’s credit agreements contain various restrictive covenants that, among other things, impose limitations on (i) dividend payments or certain other restricted payments or investments; (ii) the incurrence of additional indebtedness and guarantees; (iii) creation of liens; (iv) mergers, consolidation or sales of substantially all of WESCO’s assets; (v) certain transactions among affiliates; (vi) payments by certain subsidiaries to WESCO; and (vii) capital expenditures. In addition, the revolving credit agreement and Receivables Facility require WESCO to meet certain fixed charge coverage tests depending on availability or liquidity, respectively.

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EQUITY INVESTMENT (Details) (Deutsch Engineered Connecting Devices, Inc., USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	4 Months Ended	5 Months Ended
	Jan. 15, 2010	Mar. 31, 2010	Apr. 30, 2010	Jun. 07, 2010	Mar. 31, 2008
Schedule of Equity Method Investments
Equity Investment, Percentage Not Owned					60.00%
Equity Method Investment, Ownership Percentage	40.00%		40.00%	40.00%	40.00%
Equity Investment, Total Consideration Received					$ 75.0
Equity Investment, Cash Received				40.0	60.0
Equity Investment, Note Receivable				15.0	15.0
Amended Promissory Note Agreement, Effective Date	Jan. 15, 2010
Interest Receivable	1.8			0.5
Notification of Sale of Joint Venture, Effective Date			Apr. 30, 2010
Selling Price of Equity Investment		40.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures		43.4
Gain (Loss) on Sale of Equity Investments		3.4		0.4
Sale of Joint Venture, Effective Date				Jun. 07, 2010
Minimum
Schedule of Equity Method Investments
Selling Price of Equity Investment			40.0
Maximum
Schedule of Equity Method Investments
Selling Price of Equity Investment			50.0
Notes Receivable
Schedule of Equity Method Investments
Debt Instrument, Interest Rate, Stated Percentage	8.50%

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ACQUISITIONS

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

ACQUISITIONS

ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

Year Ended December 31	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	1,609,785		$	54,663
Fair value of liabilities assumed	(288,005		)	(6,570		)
Deferred acquisition payments	—			—
Cash paid for acquisitions	$	1,321,780		$	48,093
Supplemental cash flow disclosure related to acquisitions:
Cash paid for acquisitions	$	1,321,780		$	48,093
Less: cash acquired	(32,300		)	—
Cash paid for acquisitions, net of cash acquired	$	1,289,480		$	48,093

Acquisition of EECOL Electric Corporation

On December 14, 2012, WESCO International completed its acquisition of EECOL Electric Corporation (“EECOL”). WESCO paid at closing a cash purchase price of approximately $1.1 billion, of which $50.8 million was placed in escrow to address post-closing purchase price adjustments and potential indemnification claims. The remaining escrow will be distributed to the sellers in June 2014. To fund the purchase price paid at closing, WESCO and its subsidiaries borrowed $851 million under new term loans and $264 million under the Revolving Credit Facility. With the acquisition of EECOL, WESCO obtained a 60% ownership in a joint venture. This entity has been consolidated. The noncontrolling interest incurred a gain of less than $0.1 million in 2012.

EECOL is a full-line distributor of electrical equipment, products and services with 57 locations across Canada and 20 in South America. EECOL has a warehouse-based business focused on serving industrial, oil, gas, mining, utility, and commercial and residential construction customers.

The preliminary purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The fair value of the intangible assets was estimated by management and the allocation resulted in intangible assets of $300.4 million and goodwill of $670.4 million which is not deductible for tax purposes. The intangible assets include customer relationships of $245.1 million amortized over 20 years and trademarks of $55.3 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for these intangible assets. The goodwill arising from the acquisition is based largely on the depth and diversity of name brand products, warehouse locations, and a highly-trained and knowledgeable workforce.

Approximately $31.5 million of the $32.3 million of cash and equivalents that was transferred to the Company is expected to be remitted back to the sellers in May 2013, and accordingly, a corresponding liability has been recorded at December 31, 2012.

 The following summary presents the fair value of the assets acquired and liabilities assumed for the EECOL acquisition.

	EECOL
(In thousands)
Assets Acquired
Cash and cash equivalents	$	32,300
Trade accounts receivable	136,178
Other accounts receivable	23,187
Inventories	118,244
Prepaid expenses and other current assets	25,133
Property, buildings and equipment	73,129
Intangible assets	300,439
Goodwill	670,362
Other noncurrent assets	15,510
Total assets acquired	1,394,482
Liabilities Assumed
Accounts payable	76,509
Accrued expenses and other current liabilities	63,476
Short-term debt	5,734
Deferred income taxes - long-term	75,031
Long-term debt	6,205
Other long-term liabilities	46,870
Total liabilities assumed	273,825
Fair value of net assets acquired, including intangible assets	$	1,120,657

The operating results of EECOL have been included in WESCO's consolidated financial statements since December 14, 2012. EECOL has contributed $24.1 million to net sales. Unaudited pro forma results of operations (in thousands, except per share data) for the twelve months ended December 31, 2012 and 2011 are included below as if the acquisition occurred on the first day of the respective periods. This summary of the unaudited pro forma results of operations is not necessarily indicative of what WESCO's results of operations would have been had EECOL been acquired at the beginning of 2011, nor does it purport to represent results of operations for any future periods.

Year Ended December 31	2012		2011
(In thousands, except per share data)
Net Sales	$	7,493,978	$	6,980,120
Net Income	263,149		235,326
Earnings per common share:
Basic	$	6.02	$	5.44
Diluted	$	5.15	$	4.74

Acquisition of RS Electronics

On January 3, 2012, WESCO completed its acquisition of RS Electronics, a leading North American distributor of electronic products serving primarily the industrial, medical equipment, automotive, and contract manufacturing end markets with eight branches located in the Midwest and southeastern United States and approximately $60.0 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill of $12.2 million. Management believes the majority of goodwill will be deductible for tax purposes.

Acquisition of Trydor Industries (Canada), Ltd.

On July 3, 2012, WESCO completed its acquisition of Trydor Industries (Canada), Ltd. (“Trydor”) through one of its wholly-owned Canadian subsidiaries. Trydor is a full-line distributor of high-voltage electrical products and services addressing the transmission, substation and distribution network needs for utilities, independent power producers and utility contractors in Canada with approximately $35.0 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $19.1 million and $11.8 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $8.9 million amortized over 10 years, supplier relationships of $2.7 million amortized over 10 years and trademarks of $0.2 million amortized over 4 years. No residual value is estimated for the intangible assets.

Acquisition of Conney Safety Products, LLC

On July 9, 2012, WESCO completed the acquisition of Conney Safety Products, LLC, a distributor of MRO safety products with approximately $85 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $83.6 million and $45.3 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $40.3 million amortized over 12 years, a trademark of $1.5 million amortized over 15 years, and a trademark valued at $3.5 million with an indefinite life. No residual value is estimated for the intangible assets.

2011 Acquisitions of RECO, LLC and Brews Supply, Ltd.

On March 14, 2011, WESCO Distribution, Inc. ("WESCO Distribution") completed its acquisition of RECO, LLC ("RECO"), a Siemens automation, controls, and electrical distributor located in the midwest and southeastern regions of the United States with approximately $25 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $6.0 million. Management believes the majority of goodwill will be deductible for tax purposes.

On October 3, 2011, WESCO Distribution through its wholly-owned Canadian subsidiary, completed its acquisition of Brews Supply, Ltd. ("Brews"), a full line electrical distributor of industrial, utility, and commercial products located in western Canada with approximately $50 million in annual sales. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by an independent appraiser and the allocation resulted in goodwill and intangible assets of $19.8 million and $10.2 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include customer relationships of $4.8 million amortized over 10 years, supplier relationships of $4.2 million amortized over 10 years and trademarks of $1.2 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for the intangible assets. With the acquisition of Brews, WESCO obtained a 49% ownership in a joint venture. This entity has been consolidated. The noncontrolling interest incurred a loss of less than $0.1 million in 2011 and 2012.

2010 Acquisitions of TVC Communications, L.L.C. and Potelcom Supply, Inc.

On December 16, 2010, WESCO Distribution completed its acquisition of TVC Communications, L.L.C. (“TVC Communications”), an international distributor in the Western Hemisphere of infrastructure products to the cable television and telecommunication industries. TVC Communications offers products necessary to build out a broadband network, ranging from the industry’s widest selection of premier branded components, to a variety of proprietary and private label products. TVC Communications also offers a full suite of value-added services, including design, engineering, installation, repair and maintenance.

WESCO paid at closing a cash purchase price of approximately $251.0 million, net of $1.5 million of cash acquired, of which $20.0 million was held in escrow to address post-closing working capital adjustments. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in intangible assets of $86.4 million and goodwill of $109.2 million. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets include technology patents of $48.3 million amortized over 10 years, customer relationships of $20.6 million amortized over 10 years, supplier relationships of $9.7 million amortized over 15 years and trademarks of $7.8 million. Trademarks have an indefinite life and are not being amortized. No residual value is estimated for the intangible assets.

The allocation of assets acquired and liabilities assumed for the TVC Communications acquisition is summarized below:

	TVC Communications, LLC
(In thousands)
Assets Acquired
Cash and cash equivalents	$	1,475
Trade accounts receivable	38,744
Other accounts receivable	978
Inventories	41,313
Prepaid expenses and other current assets	1,377
Property, buildings and equipment	2,268
Intangible assets	86,442
Goodwill	109,183
Other noncurrent assets	158
Total assets acquired	281,938
Liabilities Assumed
Accounts payable	24,249
Accrued payroll and benefit costs	1,183
Other current liabilities	4,019
Total liabilities assumed	29,451
Fair value of net assets acquired, including intangible assets	$	252,487

In 2010, TVC Communications contributed $6.9 million to net sales and had no impact on net income. Unaudited pro forma results of operations (in thousands, except per share data) for the twelve months ended December 31, 2010 are included below as if the acquisition occurred on the first day.

Year Ended December 31	2010
(In thousands, except per share data)
Net Sales	$	5,315,929
Net Income	132,455
Earnings per common share:
Basic	$	3.12
Diluted	$	2.87

On June 30, 2010, WESCO Distribution completed its acquisition of Potelcom Supply, Inc., a single branch operation with annual sales of approximately $25 million serving the utility, industrial, and governmental markets in Alaska. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair value as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $10.7 million.

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PROPERTY, BUILDINGS AND EQUIPMENT

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

PROPERTY, BUILDINGS AND EQUIPMENT

PROPERTY, BUILDINGS AND EQUIPMENT

The following table sets forth the components of property, buildings and equipment:

	December 31,
	2012			2011
	(In thousands)
Buildings and leasehold improvements	$	144,627		$	96,527
Furniture, fixtures and equipment	161,135			152,164
Software costs	54,652			44,909
	360,414			293,600
Accumulated depreciation and amortization	(199,115		)	(190,385		)
	161,299			103,215
Land	38,431			21,097
Construction in progress	10,993			9,238
	$	210,723		$	133,550

Depreciation expense was $14.4 million, $12.5 million and $11.7 million, and capitalized software amortization was $8.1 million, $5.7 million and $4.7 million, in 2012, 2011 and 2010, respectively. The unamortized software cost was $21.1 million and $19.7 million as of December 31, 2012 and 2011, respectively. Furniture, fixtures and equipment include capitalized leases of $11.2 million and $9.6 million and related accumulated amortization of $5.6 million and $4.7 million as of December 31, 2012 and 2011, respectively.

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CAPITAL STOCK

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

CAPITAL STOCK

CAPITAL STOCK

Preferred Stock

There are 20 million shares of preferred stock authorized at a par value of $.01 per share. The Board of Directors has the authority, without further action by the stockholders, to issue all authorized preferred shares in one or more series and to fix the number of shares, designations, voting powers, preferences, optional and other special rights and the restrictions or qualifications thereof. The rights, preferences, privileges and powers of each series of preferred stock may differ with respect to dividend rates, liquidation values, voting rights, conversion rights, redemption provisions and other matters.

Common Stock

There are 210 million shares of common stock and 20 million shares of Class B common stock authorized at a par value of $.01 per share. The Class B common stock is identical to the common stock, except for voting and conversion rights. The holders of Class B common stock have no voting rights. With certain exceptions, Class B common stock may be converted, at the option of the holder, into the same number of shares of common stock.

Under the terms of the Revolving Credit Facility and the Term Loan Agreement, WESCO International is restricted from declaring or paying dividends and as such, at December 31, 2012 and 2011, no dividends had been declared, and therefore no retained earnings were reserved for dividend payments.

Additional Capital

WESCO separately accounts for the liability and equity components of its 2029 Debentures and 2026 Debentures in a manner that reflects its non-convertible debt borrowing rate. As of December 31, 2012 and 2011, the net equity included in additional capital related to the 2029 Debentures and 2026 Debentures totaled $106.3 million and $106.4 million, respectively.

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INCOME TAXES - SCHEDULE OF EFFECTIVE INCOME TAX RATE RECONCILIATION (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.80%	2.10%	1.50%
Nondeductible expenses	1.00%	0.70%	1.30%
Domestic tax benefit from foreign operations	(0.20%)	0.00%	(0.30%)
Foreign tax rate differences	(0.90%)	(0.80%)	0.20%
Tax effect of intercompany financing	(6.30%)	(6.10%)	(10.60%)
Federal tax credits	0.00%	(0.10%)	(0.10%)
Domestic production activity deduction	(0.50%)	(0.50%)	(0.50%)
Adjustment related to uncertain tax positions	(0.60%)	(0.70%)	(4.20%)
Revaluation of deferred tax items	(0.10%)	0.40%	1.90%
Other	(0.80%)	(0.20%)	2.50%
Effective income tax rate	28.40%	29.80%	26.70%

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COMMITMENTS AND CONTINGENCIES - SCHEDULE OF FUTURE MINIMUM RENTAL PAYMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leases, Future Minimum Payments Due [Abstract]
2013	$ 53,463
2014	40,253
2015	35,726
2016	29,147
2017	22,990
Thereafter	$ 53,092

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INCOME TAXES - NOLS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 6.7	$ 6.3
Operating Loss Carryforwards, Net of Federal Income Tax	4.4	4.0
Foreign Country
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 18.9	$ 20.2

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INCOME TAXES - SCHEDULE OF INCOME BEFORE INCOME TAX, DOMESTIC AND FOREIGN (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
United States									$ 255,700	$ 260,859	$ 166,108
Foreign									25,938	18,517	(8,467)
Income before income taxes	$ 32,117	$ 90,378	$ 84,574	$ 74,570	$ 79,534	$ 76,673	$ 71,065	$ 52,104	$ 281,639	$ 279,376	$ 157,641

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OTHER FINANCIAL INFORMATION - CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 23, 2010	Dec. 31, 2010
Condensed Financial Information
Net cash (used) provided by operating activities	$ 288,184	$ 167,533	$ 127,283	$ 127,283
Investing Activities:
Capital expenditures	(23,084)	(33,347)	(15,132)	(15,132)
Acquisition payments	(1,289,480)	(48,093)	(265,397)	(265,397)
Sale of subsidiary	0	0	40,000	40,000
Advances to subsidiaries and other	1,558	97		19,986
Net cash used in investing activities	(1,311,006)	(81,343)	(220,543)	(220,543)
Financing Activities:
Net borrowings (repayments)	1,067,836	(84,091)		33,456
Equity transactions	2,252	(2,013)		4,333
Other	(26,040)	15,196		(7,154)
Net cash provided (used) by financing activities	1,044,048	(70,908)	30,635	30,635
Effect of exchange rate changes on cash and cash equivalents	1,004	(4,990)	3,873	3,873
Net change in cash and cash equivalents	22,230	10,292	(58,752)	(58,752)
Cash and cash equivalents at the beginning of period	63,869	53,577	112,329	112,329
Cash and cash equivalents at the end of period	86,099	63,869		53,577
Parent Company
Condensed Financial Information
Net cash (used) provided by operating activities	(15,897)	(19,823)		(96,685)
Investing Activities:
Capital expenditures	0	0		0
Acquisition payments	0	0		0
Sale of subsidiary				0
Advances to subsidiaries and other	0	0		0
Net cash used in investing activities	0	0		0
Financing Activities:
Net borrowings (repayments)	13,646	21,840		92,350
Equity transactions	2,252	(2,013)		4,333
Other	0	0		0
Net cash provided (used) by financing activities	15,898	19,827		96,683
Effect of exchange rate changes on cash and cash equivalents	0	0		0
Net change in cash and cash equivalents	1	4		(2)
Cash and cash equivalents at the beginning of period	5	1	3	3
Cash and cash equivalents at the end of period	6	5		1
Guarantor Subsidiaries
Condensed Financial Information
Net cash (used) provided by operating activities	300,932	181,348		301,578
Investing Activities:
Capital expenditures	(18,697)	(28,602)		(12,903)
Acquisition payments	(142,483)	(7,750)		(265,397)
Sale of subsidiary				40,000
Advances to subsidiaries and other	(1,149,143)	(43,936)		16,431
Net cash used in investing activities	(1,310,323)	(80,288)		(221,869)
Financing Activities:
Net borrowings (repayments)	1,039,590	(105,931)		(58,894)
Equity transactions	0	0		0
Other	(22,336)	16,942		(5,398)
Net cash provided (used) by financing activities	1,017,254	(88,989)		(64,292)
Effect of exchange rate changes on cash and cash equivalents	0	0		0
Net change in cash and cash equivalents	7,863	12,071		15,417
Cash and cash equivalents at the beginning of period	44,412	32,341	16,924	16,924
Cash and cash equivalents at the end of period	52,275	44,412		32,341
Non-Guarantor Subsidiaries
Condensed Financial Information
Net cash (used) provided by operating activities	3,149	6,008		(77,610)
Investing Activities:
Capital expenditures	(4,387)	(4,745)		(2,229)
Acquisition payments	(1,146,997)	(40,343)		0
Sale of subsidiary				0
Advances to subsidiaries and other	1,558	0		0
Net cash used in investing activities	(1,149,826)	(45,088)		(2,229)
Financing Activities:
Net borrowings (repayments)	1,163,743	44,033		3,555
Equity transactions	0	0		0
Other	(3,704)	(1,746)		(1,756)
Net cash provided (used) by financing activities	1,160,039	42,287		1,799
Effect of exchange rate changes on cash and cash equivalents	1,004	(4,990)		3,873
Net change in cash and cash equivalents	14,366	(1,783)		(74,167)
Cash and cash equivalents at the beginning of period	19,452	21,235	95,402	95,402
Cash and cash equivalents at the end of period	33,818	19,452		21,235
Consolidation, Eliminations
Condensed Financial Information
Net cash (used) provided by operating activities	0	0		0
Investing Activities:
Capital expenditures	0	0		0
Acquisition payments	0	0		0
Sale of subsidiary				0
Advances to subsidiaries and other	1,149,143	44,033		3,555
Net cash used in investing activities	1,149,143	44,033		3,555
Financing Activities:
Net borrowings (repayments)	(1,149,143)	(44,033)		(3,555)
Equity transactions	0	0		0
Other	0	0		0
Net cash provided (used) by financing activities	(1,149,143)	(44,033)		(3,555)
Effect of exchange rate changes on cash and cash equivalents	0	0		0
Net change in cash and cash equivalents	0	0		0
Cash and cash equivalents at the beginning of period	0	0	0	0
Cash and cash equivalents at the end of period	$ 0	$ 0		$ 0

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EMPLOYEE BENEFIT PLANS - (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Funded Status [Table Text Block]

The following tables present the changes in benefit obligations, plan assets and funded status for the pension plans and the components of net periodic pension cost.

Year ended December 31, 2012 (In thousands)
Accumulated Benefit Obligation (ABO) at December 31	$	80,252
Change in Projected Benefit Obligation (PBO)
PBO at beginning of year	$	—
Effect of acquisition	102,829
Service cost	158
Interest cost	217
Participant contributions	85
Actuarial loss (gain), including assumption changes	277
Benefits paid	(100		)
PBO at end of year	$	103,466
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	—
Effect of acquisition	60,297
Actual return on plan assets	870
Employee contributions	85
Company contributions	298
Benefits paid	(100		)
Plan assets at end of year	$	61,450
Funded status	$	(42,016	)
Amounts recognized in the balance sheet
Current liabilities	$	(201	)
Non-current liabilities	(41,815		)
Net pension liability at end of year	$	(42,016	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	(414	)
Prior service cost	—
Total recognized in accumulated other comprehensive loss	$	(414	)

Schedule of Allocation of Plan Assets [Table Text Block]

The Company's pension plan weighted asset allocations as of December 31, 2012 by asset category are as follows:

Asset Category
Equity securities	57.7	%
Debt securities	42.3	%
	100.0	%

The following table represents the fair value of plan assets classified under the appropriate level of fair value hierarchy:

	Level 1		Level 2		Level 3		Total
Equity securities	$	—	$	35,223	$	—	$	35,223
Debt securities	505		25,722		—		26,227
Total investments	$	505	$	60,945	$	—	$	61,450

The manager is required to rebalance the asset mix back to the target on a quarterly basis.

Asset Category	Target %
Canadian equities	25	%
U.S. equities	15	%
Non-North American equities	20	%
Total equities	60	%
Fixed income bond managers	40	%

Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]

Year ended December 31, 2012 (In thousands)
Net Periodic Pension Cost
Service cost	$	158
Interest cost	217
Expected return on plan assets	(177		)
Total net periodic pension cost	$	198
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	(416	)
Total recognized in other comprehensive earnings	$	(416	)
Total recognized in net periodic pension cost and other comprehensive earnings	$	(218	)

Schedule of Assumptions Used [Table Text Block]

Actuarial assumptions used to determine benefit obligations at December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Average salary increases	4.0	%	4.0	%

Actuarial assumptions used to determine net periodic pension cost for the year ended December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Expected return on long-term assets	6.3	%	n/a
Rate of compensation increase	4.0	%	4.0	%

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future service, are expected to be paid:

Years ending December 31 (In thousands)
2013	$	1,921
2014	2,171
2015	2,568
2016	2,645
2017	2,734
2018-2023	16,724

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ACQUISITIONS - SCHEDULE OF PURCHASE PRICE ALLOCATION (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 14, 2012 EECOL Electric Corporation	Dec. 16, 2010 TVC Communications, LLC
Assets Acquired
Cash and cash equivalents	$ (32,300)	$ 0	$ 32,300	$ 1,475
Trade accounts receivable			136,178	38,744
Other accounts receivable			23,187	978
Inventories			118,244	41,313
Prepaid expenses and other current assets			25,133	1,377
Property, buildings and equipment			73,129	2,268
Intangible assets			300,439	86,442
Goodwill			670,362	109,183
Other noncurrent assets			15,510	158
Total assets acquired	1,609,785	54,663	1,394,482	281,938
Liabilities Assumed
Accounts payable			76,509	24,249
Accrued payroll and benefit costs				1,183
Other current liabilities			63,476	4,019
business acquisition purchase price allocation short term debt			5,734
Business Acquisition, Purchase Price Allocation, Deferred Income Taxes, Asset (Liability), Net			75,031
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt			6,205
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities			46,870
Total liabilities assumed	288,005	6,570	273,825	29,451
Fair value of net assets acquired, including intangible assets			$ 1,120,657	$ 252,487

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STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

WESCO has sponsored four stock option plans: the 1999 Long-Term Incentive Plan (“LTIP”), the 1998 Stock Option Plan, the Stock Option Plan for Branch Employees and the 1994 Stock Option Plan. The LTIP was designed to be the successor plan to all prior plans. Any shares remaining reserved for future issuance under the prior plans are available for issuance under the LTIP. The LTIP and predecessor plans are administered by the Compensation Committee of the Board of Directors.

An initial reserve of 6,936,000 shares of common stock has been authorized for issuance under the LTIP. This reserve automatically increases by (i) the number of shares of common stock covered by unexercised options granted under prior plans that are canceled or terminated after the effective date of the LTIP, and (ii) the number of shares of common stock surrendered by employees to pay the exercise price and/or minimum withholding taxes in connection with the exercise of stock options granted under our prior plans. As of December 31, 2012, 2.3 million shares of common stock were reserved under the LTIP for future equity award grants. In December 2003, in a privately negotiated transaction, WESCO redeemed the net equity value of stock options originally granted in 1994 and 1995, representing approximately 2.9 million shares. These shares are included in the reserve of common stock available for issuance under the LTIP.

Except for the performance-based award, awards granted vest and become exercisable once criteria based on time is achieved. Performance-based awards vest based on market or performance conditions. All awards vest immediately in the event of a change in control. Each award terminates on the tenth anniversary of its grant date unless terminated sooner under certain conditions.

As of December 31, 2012, there was $18.0 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements for all awards previously made of which approximately $11.5 million is expected to be recognized in 2013, $5.9 million in 2014 and $0.7 million in 2015.

The total intrinsic value of awards exercised during the years ended December 31, 2012, 2011, and 2010 was $41.1 million, $13.8 million, and $9.9 million, respectively. The total amount of cash received from the exercise of options was $3.2 million, $0.4 million, and $1.8 million, respectively. The tax benefit associated with the exercise of stock options and stock-settled stock appreciation rights totaled $11.4 million, $5.4 million , and $3.1 million in 2012 , 2011, and 2010, respectively. WESCO uses the direct only method and tax law ordering approach to calculate the tax effects of stock-based compensation. The tax benefit was recorded as a credit to additional paid-in capital.

The following table sets forth a summary of both stock options and stock appreciation rights and related information for the years indicated:

	2012							2011				2010
	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value (In thousands)		Awards		Weighted Average Exercise Price		Awards		Weighted Average Exercise Price
Beginning of year	4,266,533		$	39.64				4,498,303		$	36.38	4,226,153		$	35.30
Granted	257,932		64.12					399,260		59.16		708,949		33.19
Exercised	(1,340,986	)	30.54					(543,154	)	25.83		(335,155	)	14.79
Cancelled	(41,458	)	49.96					(87,876	)	46.86		(101,644	)	40.62
End of year	3,142,021		45.40		5.8	$	53,058	4,266,533		39.64		4,498,303		36.38
Exercisable at end of year	2,450,391		$	43.16	5.1	$	46,898	3,176,161		$	39.23	3,011,120		$	38.65

WESCO granted the following stock-settled stock appreciation rights at the following weighted average assumptions:

	2012	2011	2010
Stock-settled appreciation rights granted	257,932	399,260	708,949
Risk free interest rate	0.9%	2.3%	1.8%
Expected life (in years)	5	5	5
Expected volatility	50%	49%	49%

The following table sets forth a summary of time-based restricted stock units and related information for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(80,539	)	26.02
Forfeited	(10,141	)	46.09
Unvested at December 31, 2012	187,335		$	52.28

The weighted average fair value per stock-settled appreciation right granted was $27.89, $26.46 and $14.71 for the years ended December 31, 2012, 2011 and 2010, respectively. The weighted average fair value per restricted stock unit granted was $64.27, $60.05 and $33.05 for the years ended December 31, 2012, 2011 and 2010, respectively. WESCO recognized $15.1 million, $15.4 million and $15.8 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, in 2012, 2011 and 2010, respectively.

The following table sets forth a summary of performance-based awards for the year ended December 31, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at December 31, 2012	46,500		$	75.72

The performance-based awards in the table above include 23,250 shares, and the ultimate number of shares that vest will be dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are valued based upon a Monte Carlo simulation model. The probability of meeting the market criteria was considered when calculating the estimated fair market value on the date of grant. These awards were accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

The fair value of the performance shares based on total stockholder return granted during the year ended December 31, 2012 were estimated using the following weighted-average assumptions:

Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

Vesting of the remaining 23,250 shares of performance-based awards in the table above will be dependent upon the three-year average growth rate of WESCO's net income. These awards are valued based upon the grant-date closing price of WESCO's common stock. These awards were accounted for as awards with performance conditions, accordingly stock-based compensation expense is recognized over the performance period and considers the probability that the performance targets will be achieved.

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II—Valuation and Qualifying Accounts

	(In thousands)
	Balance at Beginning		Charged to		Charged to Other					Balance at
(In thousands)	of Period		Expense		Accounts		Deductions(1)			End of Period
Allowance for doubtful accounts
Year ended December 31, 2012	$	21,590	$	1,119	$	—	$	(5,467	)	$	17,242
Year ended December 31, 2011	18,562		6,583		—		(3,555		)	21,590
Year ended December 31, 2010	20,060		6,439		—		(7,937		)	18,562

_________________________

⁽¹⁾  Includes a reduction in the allowance for doubtful accounts due to write-off of accounts receivable.

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ACQUISITIONS - ACQUISITIONS (Details) (USD $)	3 Months Ended								12 Months Ended				0 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 14, 2012 EECOL Electric Corporation	Jan. 03, 2012 RS Electronics	Dec. 31, 2012 RS Electronics	Jul. 03, 2012 Trydor Industries (Canada), Ltd.	Dec. 31, 2012 Trydor Industries (Canada), Ltd.	Jul. 09, 2012 Conney Safety Products, LLC	Dec. 31, 2012 Conney Safety Products, LLC	Mar. 14, 2011 RECO, LLC	Dec. 31, 2011 RECO, LLC	Oct. 03, 2011 Brews Supply, Ltd	Dec. 31, 2011 Brews Supply, Ltd	Dec. 16, 2010 TVC Communications, LLC	Dec. 31, 2010 TVC Communications, LLC	Jun. 30, 2010 Potelcom Supply, Inc	Dec. 31, 2010 Potelcom Supply, Inc	Dec. 31, 2012 Customer Relationships EECOL Electric Corporation Y	Dec. 14, 2012 Customer Relationships EECOL Electric Corporation	Dec. 31, 2012 Customer Relationships Trydor Industries (Canada), Ltd. Y	Jul. 03, 2012 Customer Relationships Trydor Industries (Canada), Ltd.	Dec. 31, 2012 Customer Relationships Conney Safety Products, LLC Y	Jul. 09, 2012 Customer Relationships Conney Safety Products, LLC	Dec. 31, 2011 Customer Relationships Brews Supply, Ltd Y	Oct. 03, 2011 Customer Relationships Brews Supply, Ltd	Dec. 31, 2010 Customer Relationships TVC Communications, LLC Y	Dec. 16, 2010 Customer Relationships TVC Communications, LLC	Dec. 31, 2012 Supplier Relationships Trydor Industries (Canada), Ltd. Y	Jul. 03, 2012 Supplier Relationships Trydor Industries (Canada), Ltd.	Dec. 31, 2011 Supplier Relationships Brews Supply, Ltd Y	Oct. 03, 2011 Supplier Relationships Brews Supply, Ltd	Dec. 31, 2010 Supplier Relationships TVC Communications, LLC Y	Dec. 16, 2010 Supplier Relationships TVC Communications, LLC	Dec. 31, 2010 Patented Technology TVC Communications, LLC Y	Dec. 16, 2010 Patented Technology TVC Communications, LLC	Dec. 31, 2012 Trademarks Trydor Industries (Canada), Ltd. Y	Jul. 03, 2012 Trademarks Trydor Industries (Canada), Ltd.	Dec. 31, 2012 Trademarks Conney Safety Products, LLC Y	Jul. 09, 2012 Trademarks Conney Safety Products, LLC	Dec. 14, 2012 Trademarks Brews Supply, Ltd	Oct. 03, 2011 Trademarks Brews Supply, Ltd	Dec. 16, 2010 Trademarks TVC Communications, LLC
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition												12/14/2012	1/3/2012		7/3/2012		7/9/2012		3/14/2011		10/3/2011		12/16/2010		6/30/2010
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period														$ 60,000,000		$ 35,000,000		$ 85,000,000		$ 25,000,000		$ 50,000,000				$ 25,000,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount												670,362,000	12,200,000		19,100,000		83,600,000		6,000,000		19,800,000		109,183,000		10,700,000
Business Acquisition, Purchase Price Allocation, Intangible assets												300,439,000			11,800,000		45,300,000				10,200,000		86,442,000
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets																												245,100,000		8,900,000		40,300,000		4,800,000		20,600,000		2,700,000		4,200,000		9,700,000		48,300,000				1,500,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life																											20		10		12		10		10		10		10		15		10		4		15
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable																																														200,000		3,500,000	55,300,000	1,200,000	7,800,000
Business Acquisition, Purchase Price Allocation, Current Liabilities												31,500,000
Noncontrolling Interest, Ownership Percentage by Parent												60.00%										49.00%
Net loss attributable to noncontrolling interest									(18,000)	(11,000)	0											100,000
Business Acquisition, Cost of Acquired Entity, Purchase Price	1,289,480,000				48,093,000				1,289,480,000	48,093,000		1,100,000,000											251,000,000
Cash and cash equivalents	(32,300,000)				0				(32,300,000)	0		32,300,000											1,475,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred												50,800,000											20,000,000
business combination debt incurred term loan												851,000,000
business combination debt incurred revolving credit facility												264,000,000
Noncontrolling Interest, Increase from Business Combination												100,000
Net sales	$ 1,644,363,000	$ 1,656,186,000	$ 1,672,734,000	$ 1,606,018,000	$ 1,589,522,000	$ 1,580,376,000	$ 1,524,515,000	$ 1,431,305,000	$ 6,579,301,000	$ 6,125,718,000	$ 5,063,862,000	$ 24,100,000												$ 6,900,000

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ORGANIZATION (Details)	12 Months Ended
	Dec. 31, 2012 customers distribution_centers countries branches
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Customers (in customers)	65,000
Full service branches (in branches)	475
Distribution centers (in distribution centers)	9
Additional countries (in countries)	15

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Common Class B	Additional Capital	Retained Earnings (Deficit)	Treasury Stock	Noncontrolling Interest	Accumulated Other Comprehensive Income (Loss)	Convertible Senior Debentures Due In 2025 Common Stock	Convertible Senior Debentures Due In 2025 Additional Capital	Convertible Senior Debentures Due in 2029 Common Stock	Convertible Senior Debentures Due in 2029 Additional Capital
Stockholders' equity at period start at Dec. 31, 2009		$ 560	$ 43	$ 992,855	$ 582,199	$ (590,353)	$ 0	$ 10,985
Shares at period start at Dec. 31, 2009		55,967,824	4,339,431			(17,890,459)
Exercise of stock options, value		3		4,852		(654)
Exercise of stock options, amount	335,155	268,213				(15,281)
Stock-based compensation expense				15,751
Conversion of debentures, value									3	5,225
Conversion of debentures, shares									340,213
Net income	115,477				115,477
Translation adjustment								11,648
Stockholders' equity at period end at Dec. 31, 2010		566	43	1,018,683	697,676	(591,007)	0	22,633
Shares at period end at Dec. 31, 2010		56,576,250	4,339,431			(17,905,740)
Exercise of stock options, value		6		5,783		(7,838)
Exercise of stock options, amount	543,154	531,121				(146,614)
Stock-based compensation expense				15,407
Conversion of debentures, value												(5)
Conversion of debentures, shares											589
Issuance of treasury stock, value				(582)		957
Issuance of treasury stock, shares						28,994
Exercise of restricted stock units and retirement of common stock, value		(1)		(2,419)	(2,138)	4,559
Exercise of restricted stock units and retirement of common stock, shares		(86,437)				86,437
Acquisition of noncontrolling interest							77
Net income	196,240				196,251		(11)
Translation adjustment								(12,576)
Stockholders' equity at period end at Dec. 31, 2011	1,345,998	571	43	1,036,867	891,789	(593,329)	(88)	10,057
Shares at period end at Dec. 31, 2011		57,021,523	4,339,431			(17,936,923)
Exercise of stock options, value		8		14,310		(12,277)
Exercise of stock options, amount	1,340,986	829,401				(192,669)
Stock-based compensation expense				15,088
Conversion of debentures, value												(5)
Conversion of debentures, shares											688
Exercise of restricted stock units and retirement of common stock, value				(710)	(847)	1,556
Exercise of restricted stock units and retirement of common stock, shares		(27,064)				27,064
Acquisition of noncontrolling interest							(18)
Net income	201,759				201,777
Translation adjustment								(11,101)
Stockholders' equity at period end at Dec. 31, 2012	$ 1,553,797	$ 579	$ 43	$ 1,065,550		$ (604,050)	$ (106)	$ (1,044)
Shares at period end at Dec. 31, 2012		57,824,548	4,339,431			(18,102,528)

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SEGMENTS AND RELATED INFORMATION - SCHEDULE OF REVENUE FROM EXTERNAL CUSTOMERS BY PRODUCT AND SERVICES (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
General and Industrial Supplies
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	36.00%	34.00%	35.00%
Wire, Cable and Conduit
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	17.00%	18.00%	18.00%
Data and Broadband Communications
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	15.00%	17.00%	15.00%
Power Distribution Equipment
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	13.00%	11.00%	12.00%
Lighting and Controls
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	9.00%	9.00%	10.00%
Control, Automation and Motors
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	10.00%	11.00%	10.00%

XML

ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

ACCOUNTING POLICIES

Revenue Recognition

Revenues are recognized for product sales when title, ownership and risk of loss pass to the customer or for services when the service is rendered. In the case of stock sales and special orders, a sale occurs at the time of shipment from WESCO's distribution point, as the terms of WESCO’s sales are predominantly FOB shipping point. In cases where WESCO processes customer orders but ships directly from its suppliers, revenue is recognized once product is shipped and title has passed. In all cases, revenue is recognized once the sales price to the customer is fixed or is determinable and WESCO has reasonable assurance as to the collectability.

In certain customer arrangements, WESCO provides services such as inventory management. WESCO may perform some or all of the following services for customers: determine inventory stocking levels; establish inventory reorder points; launch purchase orders; receive material; put away material; and pick material for order fulfillment. WESCO recognizes revenue for services rendered during the period based upon a previously negotiated fee arrangement. WESCO also sells inventory to these customers and recognizes revenue at the time title and risk of loss transfers to the customer. The amount of revenue attributed to these services totaled $17.6 million, $10.8 million, and $11.1 million in 2012, 2011 and 2010, respectively.

Selling, General and Administrative Expenses

WESCO includes warehousing, purchasing, branch operations, information services, and marketing and selling expenses in this category, as well as other types of general and administrative costs.

Supplier Volume Rebates

WESCO receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable on the balance sheet, and represent the estimated amounts due to WESCO under the rebate provisions of the various supplier contracts. The corresponding rebate income is recorded as a reduction of cost of goods sold. The appropriate level of such income is derived from the level of actual purchases made by WESCO from suppliers. Receivables under the supplier rebate program were $68.7 million at December 31, 2012 and $38.5 million at December 31, 2011. Supplier volume rebate rates have historically ranged between approximately 0.8% and 1.3% of sales depending on market conditions. In 2012, the rebate rate was 1.3%.

Shipping and Handling Costs and Fees

WESCO records the costs and fees associated with transporting its products to customers as a component of selling, general and administrative expenses. These costs totaled $49.9 million, $50.9 million and $42.4 million in 2012, 2011 and 2010, respectively.

Cash Equivalents

Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased.

Asset Securitization

WESCO maintains control of the receivables transferred pursuant to its accounts receivable securitization program (the “Receivables Facility”); therefore the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and WESCO recognizes the related secured borrowing. The expenses associated with the Receivables Facility are reported as interest expense in the statement of income.

Allowance for Doubtful Accounts

WESCO maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. WESCO has a systematic procedure using estimates based on historical data and reasonable assumptions of collectability made at the local branch level and on a consolidated corporate basis to calculate the allowance for doubtful accounts. If the financial condition of WESCO’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The allowance for doubtful accounts was $17.2 million at December 31, 2012 and $21.6 million at December 31, 2011. The total amount recorded as selling, general and administrative expense related to bad debts was $1.1 million, $6.6 million and $6.4 million for 2012, 2011 and 2010, respectively.

Inventories

Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or market. Cost is determined principally under the average cost method. WESCO makes provisions for obsolete or slow-moving inventories as necessary to reflect reduction in inventory value. WESCO writes down its inventory to its net realizable value based on internal factors derived from historical analysis of actual losses. Looking back, WESCO identifies items at risk of becoming obsolete, which are defined as excess of 36 months supply relative to demand or movement. WESCO then analyzes the ultimate disposition of previously identified excess inventory items, such as sold, returned to supplier, or scrapped. This item by item analysis allows WESCO to develop an estimate of the historical likelihood that an item identified as being in excess supply ultimately becomes obsolete. WESCO applies the estimate to inventory items currently in excess of 36 months supply, and reduces its inventory carrying value by the derived amount. Reserves for excess and obsolete inventories were $16.7 million and $14.6 million at December 31, 2012 and 2011, respectively. The total expense related to excess and obsolete inventories, included in cost of goods sold, was $11.4 million, $5.5 million and $7.5 million for 2012, 2011 and 2010, respectively. WESCO absorbs into the cost of inventory the general and administrative expenses related to inventory such as purchasing, receiving and storage and at December 31, 2012 and 2011, $62.2 million and $47.6 million, respectively, of these costs were included in ending inventory.

Other Assets

WESCO amortizes deferred financing fees over the term of the various debt instruments. Deferred financing fees in the amount of $17.8 million were incurred during the year ending December 31, 2012. As of December 31, 2012 and 2011, the amount of other assets related to unamortized deferred financing fees was $26.4 million and $12.9 million, respectively.

Property, Buildings and Equipment

Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives range from five to forty years for leasehold improvements and buildings and three to ten years for furniture, fixtures and equipment.

Capitalized computer software costs are amortized using the straight-line method over the estimated useful life, typically three to five years, and are reported at the lower of unamortized cost.

Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property is retired or otherwise disposed of, the cost and the related accumulated depreciation are removed from the accounts and any related gains or losses are recorded and reported as selling, general and administrative expenses.

WESCO assesses its long-lived assets for impairment by periodically reviewing operating performance and respective utilization of real and tangible assets. Upon closure of any branch, asset usefulness and remaining life are evaluated and charges are taken as appropriate. Of WESCO’s $210.7 million net book value of property, plant and equipment as of December 31, 2012, $136.8 million consists of land, buildings and leasehold improvements and are geographically dispersed among WESCO’s 475 branches and nine distribution centers, mitigating the risk of impairment. Approximately $28.5 million of assets consist of computer equipment and capitalized software and are evaluated for use and serviceability relative to carrying value. The remaining fixed assets, mainly of furniture and fixtures, warehousing equipment and transportation equipment, are similarly evaluated for serviceability and use.

Goodwill and Indefinite Life Intangible Assets

Goodwill and indefinite life intangible assets are tested for impairment annually during the fourth quarter using information available at the end of September, or more frequently if events or circumstances occur indicating that their carrying value may not be recoverable. The evaluation of impairment involves comparing the current fair value of goodwill and indefinite life intangible assets to the recorded value. WESCO estimates the fair value of goodwill using a combination of discounted cash flow analyses and market multiples. Assumptions used for these fair value techniques are based on a combination of historical results, current forecasts, market data and recent economic events. WESCO evaluates the recoverability of indefinite life intangible assets using a discounted cash flow analysis based on projected financial information. The determination of fair value involves significant judgment and management applies its best judgment when assessing the reasonableness of financial projections. At December 31, 2012 and 2011, goodwill and indefinite life trademarks totaled $1,882.9 million and $1,055.0 million, respectively. No impairment losses were identified in 2012 as a result of this review. However, two trademarks valued at $18.1 million are sensitive to a further decline in financial performance. WESCO is taking actions to improve its future financial performance; however, WESCO cannot predict whether or not there will be certain events that could adversely affect the reported value of these trademarks.

Definite Lived Intangible Assets

Intangible assets are amortized over 4 to 20 years. A portion of intangible assets related to certain customer relationships are amortized using an accelerated method whereas all other intangible assets subject to amortization use a straight-line method which reflects the pattern in which the economic benefits of the respective assets are consumed or otherwise used. Intangible assets are tested for impairment if events or circumstances occur indicating that the respective asset might be impaired.

Insurance Programs

WESCO uses commercial insurance for auto, workers’ compensation, casualty and health claims as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductibles where WESCO must pay all costs up to the deductible amount. WESCO estimates the reserve based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time from incurrence of a claim until the claim is paid by the insurance provider. The total liability related to the insurance programs was $11.3 million at December 31, 2012 and $9.7 million at December 31, 2011.

Income Taxes

Income taxes are accounted for under the liability method in accordance with income tax accounting guidance. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. Valuation allowances, if any, are provided when it is more likely than not that a portion or all of a deferred tax asset may not be realized.

WESCO accounts for uncertainty in income taxes using a recognition threshold and measurement attribute prescribed by income tax accounting guidance. WESCO frequently reviews tax issues and positions taken on tax returns to determine the need and amount of contingency reserves necessary to cover any probable audit adjustments. WESCO recognizes interest related to unrecognized tax benefits as part of interest expense. Penalties are recognized as part of income tax expense.

Convertible Debentures

WESCO separately accounts for the liability and equity components of its convertible debentures in a manner that reflects its non-convertible debt borrowing rate. WESCO estimates its non-convertible debt borrowing rate through a combination of discussions with its financial institutions and review of relevant market data. The discounts to the convertible note balances are amortized to interest expense, using the effective interest method, over the implicit life of the Debentures.

Foreign Currency

The local currency is the functional currency for the majority of WESCO’s operations outside the United States. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at the average exchange rate prevailing during the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of other comprehensive income within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period.

Defined Benefit Pension Plan

In connection with the December 14, 2012 acquisition of EECOL, the Company assumed a contributory defined benefit plan covering all Canadian employees of EECOL. The plan provides retirement benefits based upon earnings and credited service, and participants contribute 2% or 4% of their earnings to the plan depending on their employment level.

The Company also assumed EECOL's Supplemental Executive Retirement Plan (SERP) which provides additional pension benefits to certain executives based on earnings, credited service, and executive service.

Liabilities and expenses for pension benefits are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality).

The interest rate used to discount future estimated cash flows is determined using a high quality corporate bonds yield curve model developed with the assistance of an external actuary. The cash flows of the plans' projected benefit obligations are discounted using a single equivalent rate derived from yields on high quality corporate bonds. The yield curve model parallels the plans' projected cash flows. The discount rate used to determine benefit obligations for the Canadian pension was 4.5% in 2012. The impact on the liabilities of a change in the discount rate of one quarter percent would be approximately $5.1 million and either a charge or credit of $0.3 million to after-tax earnings in the following year.

The expected long-term rate of return on plan assets is applied to the fair market-related value of plan assets.

Stock-Based Compensation

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units, and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. Expected volatilities are based on historical volatility of WESCO’s common stock. The expected life of stock options and stock-settled appreciation rights is estimated using historical data pertaining to option exercises and employee terminations. The risk-free rate is based on the U.S. Treasury yields in effect at the time of grant. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. Performance-based awards are valued using a Monte Carlo simulation model. The probability of meeting market criteria is considered when calculating the estimated fair market value on the date of grant. These awards are accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest. No dividends are assumed for stock based awards.

Treasury Stock

Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock, with cost determined on a weighted average basis.

Fair Value of Financial Instruments

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and other accrued liabilities, and outstanding indebtedness. The estimated fair value of the Company’s outstanding indebtedness described in Note 7 at December 31, 2012 and 2011 was $2,423.7 million and $1,178.9 million, respectively. The aggregate fair value of the senior notes and debentures was approximately $1,704.5 million and $850.9 million at December 31, 2012 and 2011, respectively. The fair values of these fixed rate facilities are estimated based upon market price quotes. The fair values of the mortgage facility, the Term Loan, the accounts receivable securitization facility (the "Receivables Facility") and the revolving credit facility ("the Revolving Credit Facility"), approximated carrying values. The fair values for these facilities are based upon market price quotes and market comparisons available for instruments with similar terms and maturities. For all remaining WESCO financial instruments, carrying values are considered to approximate fair value due to their short maturities.

Environmental Expenditures

WESCO has facilities and operations that distribute certain products that must comply with environmental regulations and laws. Expenditures for current operations are expensed or capitalized, as appropriate. Expenditures relating to existing conditions caused by past operations, and that do not contribute to future revenue, are expensed. Liabilities are recorded when remedial efforts are probable and the costs can be reasonably estimated.

Reclassification

    Certain prior period balances within the financial statements have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (the "FASB") issued new disclosure guidance related to the presentation of the statement of comprehensive income. This guidance provides an entity the option to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements; the option to report other comprehensive income and its components in the statement of changes in stockholders' equity was eliminated. This accounting standard is effective for periods beginning on or after December 15, 2011. WESCO has elected the option to present the components of net income and the components of comprehensive income in a single continuous statement of comprehensive income.

In July 2012, the Financial Accounting Standards Board (the "FASB") issued updated guidance on the periodic testing of indefinite-lived intangible assets, other than goodwill, for impairment. This updated guidance will allow companies the option to first access qualitative factors to determine if it is more-likely-than-not that an indefinite-lived intangible asset might be impaired and whether it is necessary to perform the quantitative impairment test required under current accounting standards. This guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. WESCO will adopt this guidance in 2013. Adoption of this guidance is not expected to have a material impact on WESCO's financial position, results of operations or cash flows.

Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to WESCO’s financial position, results of operations or cash flows.

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DEBT - SCHEDULE OF MATURITIES OF LONG-TERM DEBT (Details) (USD $)	Dec. 31, 2012	Dec. 12, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
2013	$ 66,173,000
2014	454,436,000
2015	9,192,000
2016	227,162,000
2017	8,691,000
Thereafter	1,153,162,000
Total payments on debt	1,918,816,000
Debt discount on convertible debentures	(183,644,000)	(0.010)	(175,908,000)
Total long-term debt	$ 1,735,172,000

XML

STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARDS, VALUATION ASSUMPTIONS (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	0.90%	2.30%	1.80%
Expected life (in years)	5	5	5
Expected volatility	50.00%	49.00%	49.00%
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled appreciation rights granted	257,932	399,260	708,949

XML

EARNINGS PER SHARE - EARNINGS PER SHARE (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of Dilutive Securities on Earnings Per Share	$ 0.56	$ 0.47	$ 0.16
Convertible Debt Securities | Convertible Senior Debentures Due in 2029
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 28.87
Earnings Per Share Dilution Limit	11,949,205
Stock Appreciation Rights (SARs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share	900,000	1,200,000	2,400,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price	$ 64.17	$ 62.48	$ 46.73

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ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Basis of Consolidation

Basis of Consolidation

The consolidated financial statements include the accounts of WESCO International and all of its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions WESCO may undertake in the future, actual results may ultimately differ from the estimates.

Revenue Recognition

Revenue Recognition

Revenues are recognized for product sales when title, ownership and risk of loss pass to the customer or for services when the service is rendered. In the case of stock sales and special orders, a sale occurs at the time of shipment from WESCO's distribution point, as the terms of WESCO’s sales are predominantly FOB shipping point. In cases where WESCO processes customer orders but ships directly from its suppliers, revenue is recognized once product is shipped and title has passed. In all cases, revenue is recognized once the sales price to the customer is fixed or is determinable and WESCO has reasonable assurance as to the collectability.

In certain customer arrangements, WESCO provides services such as inventory management. WESCO may perform some or all of the following services for customers: determine inventory stocking levels; establish inventory reorder points; launch purchase orders; receive material; put away material; and pick material for order fulfillment. WESCO recognizes revenue for services rendered during the period based upon a previously negotiated fee arrangement. WESCO also sells inventory to these customers and recognizes revenue at the time title and risk of loss transfers to the customer. The amount of revenue attributed to these services totaled $17.6 million, $10.8 million, and $11.1 million in 2012, 2011 and 2010, respectively.

Selling, General and Administrative Expenses

Selling, General and Administrative Expenses

WESCO includes warehousing, purchasing, branch operations, information services, and marketing and selling expenses in this category, as well as other types of general and administrative costs.

Supplier Volume Rebates

Supplier Volume Rebates

WESCO receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable on the balance sheet, and represent the estimated amounts due to WESCO under the rebate provisions of the various supplier contracts. The corresponding rebate income is recorded as a reduction of cost of goods sold. The appropriate level of such income is derived from the level of actual purchases made by WESCO from suppliers. Receivables under the supplier rebate program were $68.7 million at December 31, 2012 and $38.5 million at December 31, 2011. Supplier volume rebate rates have historically ranged between approximately 0.8% and 1.3% of sales depending on market conditions. In 2012, the rebate rate was 1.3%.

Shipping and Handling Costs and Fees

Shipping and Handling Costs and Fees

WESCO records the costs and fees associated with transporting its products to customers as a component of selling, general and administrative expenses. These costs totaled $49.9 million, $50.9 million and $42.4 million in 2012, 2011 and 2010,

Cash Equivalents

Cash Equivalents

Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased.

Asset Securitization

Asset Securitization

WESCO maintains control of the receivables transferred pursuant to its accounts receivable securitization program (the “Receivables Facility”); therefore the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and WESCO recognizes the related secured borrowing. The expenses associated with the Receivables Facility are reported as interest expense in the statement of income.

Allowance for Doubtful Accounts

Allowance for Doubtful AccountsWESCO maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. WESCO has a systematic procedure using estimates based on historical data and reasonable assumptions of collectability made at the local branch level and on a consolidated corporate basis to calculate the allowance for doubtful accounts. If the financial condition of WESCO’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The allowance for doubtful accounts was $17.2 million at December 31, 2012 and $21.6 million at December 31, 2011. The total amount recorded as selling, general and administrative expense related to bad debts was $1.1 million, $6.6 million and $6.4 million for 2012, 2011 and 2010, respectively.

Inventories

Inventories

Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or market. Cost is determined principally under the average cost method. WESCO makes provisions for obsolete or slow-moving inventories as necessary to reflect reduction in inventory value. WESCO writes down its inventory to its net realizable value based on internal factors derived from historical analysis of actual losses. Looking back, WESCO identifies items at risk of becoming obsolete, which are defined as excess of 36 months supply relative to demand or movement. WESCO then analyzes the ultimate disposition of previously identified excess inventory items, such as sold, returned to supplier, or scrapped. This item by item analysis allows WESCO to develop an estimate of the historical likelihood that an item identified as being in excess supply ultimately becomes obsolete. WESCO applies the estimate to inventory items currently in excess of 36 months supply, and reduces its inventory carrying value by the derived amount. Reserves for excess and obsolete inventories were $16.7 million and $14.6 million at December 31, 2012 and 2011, respectively. The total expense related to excess and obsolete inventories, included in cost of goods sold, was $11.4 million, $5.5 million and $7.5 million for 2012, 2011 and 2010, respectively. WESCO absorbs into the cost of inventory the general and administrative expenses related to inventory such as purchasing, receiving and storage and at December 31, 2012 and 2011, $62.2 million and $47.6 million, respectively, of these costs were included in ending inventory.

Other Assets

Other Assets

WESCO amortizes deferred financing fees over the term of the various debt instruments. Deferred financing fees in the amount of $17.8 million were incurred during the year ending December 31, 2012. As of December 31, 2012 and 2011, the amount of other assets related to unamortized deferred financing fees was $26.4 million and $12.9 million, respectively.

Property, Buildings and Equipment

Property, Buildings and Equipment

Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives range from five to forty years for leasehold improvements and buildings and three to ten years for furniture, fixtures and equipment.

Capitalized computer software costs are amortized using the straight-line method over the estimated useful life, typically three to five years, and are reported at the lower of unamortized cost.

Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property is retired or otherwise disposed of, the cost and the related accumulated depreciation are removed from the accounts and any related gains or losses are recorded and reported as selling, general and administrative expenses.

WESCO assesses its long-lived assets for impairment by periodically reviewing operating performance and respective utilization of real and tangible assets. Upon closure of any branch, asset usefulness and remaining life are evaluated and charges are taken as appropriate. Of WESCO’s $210.7 million net book value of property, plant and equipment as of December 31, 2012, $136.8 million consists of land, buildings and leasehold improvements and are geographically dispersed among WESCO’s 475 branches and nine distribution centers, mitigating the risk of impairment. Approximately $28.5 million of assets consist of computer equipment and capitalized software and are evaluated for use and serviceability relative to carrying value. The remaining fixed assets, mainly of furniture and fixtures, warehousing equipment and transportation equipment, are similarly evaluated for serviceability and use.

Goodwill and Intangible Assets

Goodwill and Indefinite Life Intangible Assets

Goodwill and indefinite life intangible assets are tested for impairment annually during the fourth quarter using information available at the end of September, or more frequently if events or circumstances occur indicating that their carrying value may not be recoverable. The evaluation of impairment involves comparing the current fair value of goodwill and indefinite life intangible assets to the recorded value. WESCO estimates the fair value of goodwill using a combination of discounted cash flow analyses and market multiples. Assumptions used for these fair value techniques are based on a combination of historical results, current forecasts, market data and recent economic events. WESCO evaluates the recoverability of indefinite life intangible assets using a discounted cash flow analysis based on projected financial information. The determination of fair value involves significant judgment and management applies its best judgment when assessing the reasonableness of financial projections. At December 31, 2012 and 2011, goodwill and indefinite life trademarks totaled $1,882.9 million and $1,055.0 million, respectively. No impairment losses were identified in 2012 as a result of this review. However, two trademarks valued at $18.1 million are sensitive to a further decline in financial performance. WESCO is taking actions to improve its future financial performance; however, WESCO cannot predict whether or not there will be certain events that could adversely affect the reported value of these trademarks.

Definite Lived Intangible Assets

Definite Lived Intangible Assets

Intangible assets are amortized over 4 to 20 years. A portion of intangible assets related to certain customer relationships are amortized using an accelerated method whereas all other intangible assets subject to amortization use a straight-line method which reflects the pattern in which the economic benefits of the respective assets are consumed or otherwise used. Intangible assets are tested for impairment if events or circumstances occur indicating that the respective asset might be impaired.

Insurance Programs

Insurance Programs

WESCO uses commercial insurance for auto, workers’ compensation, casualty and health claims as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductibles where WESCO must pay all costs up to the deductible amount. WESCO estimates the reserve based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time from incurrence of a claim until the claim is paid by the insurance provider. The total liability related to the insurance programs was $11.3 million at December 31, 2012 and $9.7 million at December 31, 2011.

Income Taxes

Income Taxes

Income taxes are accounted for under the liability method in accordance with income tax accounting guidance. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. Valuation allowances, if any, are provided when it is more likely than not that a portion or all of a deferred tax asset may not be realized.

WESCO accounts for uncertainty in income taxes using a recognition threshold and measurement attribute prescribed by income tax accounting guidance. WESCO frequently reviews tax issues and positions taken on tax returns to determine the need and amount of contingency reserves necessary to cover any probable audit adjustments. WESCO recognizes interest related to unrecognized tax benefits as part of interest expense. Penalties are recognized as part of income tax expense.

Convertible Debentures

Convertible Debentures

WESCO separately accounts for the liability and equity components of its convertible debentures in a manner that reflects its non-convertible debt borrowing rate. WESCO estimates its non-convertible debt borrowing rate through a combination of discussions with its financial institutions and review of relevant market data. The discounts to the convertible note balances are amortized to interest expense, using the effective interest method, over the implicit life of the Debentures.

Foreign Currency

Foreign Currency

The local currency is the functional currency for the majority of WESCO’s operations outside the United States. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at the average exchange rate prevailing during the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of other comprehensive income within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period.

Defined Benefit Pension Plan

Defined Benefit Pension Plan

In connection with the December 14, 2012 acquisition of EECOL, the Company assumed a contributory defined benefit plan covering all Canadian employees of EECOL. The plan provides retirement benefits based upon earnings and credited service, and participants contribute 2% or 4% of their earnings to the plan depending on their employment level.

The Company also assumed EECOL's Supplemental Executive Retirement Plan (SERP) which provides additional pension benefits to certain executives based on earnings, credited service, and executive service.

Liabilities and expenses for pension benefits are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality).

The interest rate used to discount future estimated cash flows is determined using a high quality corporate bonds yield curve model developed with the assistance of an external actuary. The cash flows of the plans' projected benefit obligations are discounted using a single equivalent rate derived from yields on high quality corporate bonds. The yield curve model parallels the plans' projected cash flows. The discount rate used to determine benefit obligations for the Canadian pension was 4.5% in 2012. The impact on the liabilities of a change in the discount rate of one quarter percent would be approximately $5.1 million and either a charge or credit of $0.3 million to after-tax earnings in the following year.

The expected long-term rate of return on plan assets is applied to the fair market-related value of plan assets.

Stock-Based Compensation

Stock-Based Compensation

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units, and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. Expected volatilities are based on historical volatility of WESCO’s common stock. The expected life of stock options and stock-settled appreciation rights is estimated using historical data pertaining to option exercises and employee terminations. The risk-free rate is based on the U.S. Treasury yields in effect at the time of grant. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. Performance-based awards are valued using a Monte Carlo simulation model. The probability of meeting market criteria is considered when calculating the estimated fair market value on the date of grant. These awards are accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest. No dividends are assumed for stock based awards.

Treasury Stock

Treasury Stock

Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock, with cost determined on a weighted average basis.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and other accrued liabilities, and outstanding indebtedness. The estimated fair value of the Company’s outstanding indebtedness described in Note 7 at December 31, 2012 and 2011 was $2,423.7 million and $1,178.9 million, respectively. The aggregate fair value of the senior notes and debentures was approximately $1,704.5 million and $850.9 million at December 31, 2012 and 2011, respectively. The fair values of these fixed rate facilities are estimated based upon market price quotes. The fair values of the mortgage facility, the Term Loan, the accounts receivable securitization facility (the "Receivables Facility") and the revolving credit facility ("the Revolving Credit Facility"), approximated carrying values. The fair values for these facilities are based upon market price quotes and market comparisons available for instruments with similar terms and maturities. For all remaining WESCO financial instruments, carrying values are considered to approximate fair value due to their short maturities.

Environmental Expenditures

Environmental Expenditures

WESCO has facilities and operations that distribute certain products that must comply with environmental regulations and laws. Expenditures for current operations are expensed or capitalized, as appropriate. Expenditures relating to existing conditions caused by past operations, and that do not contribute to future revenue, are expensed. Liabilities are recorded when remedial efforts are probable and the costs can be reasonably estimated.

Reclassification

Reclassification

    Certain prior period balances within the financial statements have been reclassified to conform with current year presentation.

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EMPLOYEE BENEFIT PLANS Assumptions 2 (Details)	12 Months Ended
	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Discount rate	4.50%
Expected return on long-term assets	6.30%
Rate of compensation increase	4.00%

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OTHER FINANCIAL INFORMATION (Tables)

12 Months Ended

Dec. 31, 2012

Condensed Financial Information [Abstract]

Condensed Financial Information, Statements of Financial Condition

Condensed consolidating financial information for WESCO International, WESCO Distribution, Inc. and the non-guarantor subsidiaries is as follows:

CONDENSED CONSOLIDATING BALANCE SHEETS

	December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	6	$	52,275	$	33,818	$	—		$	86,099
Trade accounts receivable, net	—		—		1,036,235		—			1,036,235
Inventories, net	—		347,008		446,966		—			793,974
Other current assets	—		66,106		119,423		—			185,529
Total curent assets	6		465,389		1,636,442		—			2,101,837
Intercompany receivables, net	—		—		1,077,001		(1,077,001		)	—
Property, buildings and equipment, net	—		58,523		152,200		—			210,723
Intangible assets, net	—		6,153		490,608		—			496,761
Goodwill and other intangibles, net	—		246,125		1,531,672		—			1,777,797
Investments in affiliates and other noncurrent assets	2,443,259		3,607,616		20,997		(6,029,361		)	42,511
Total assets	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629
Accounts payable	$	—	$	401,016	$	305,564	$	—		$	706,580
Short-term debt	—		—		30,136		—			30,136
Other current liabilities	18,419		100,956		151,904		—			271,279
Total current liabilities	18,419		501,972		487,604		—			1,007,995
Intercompany payables, net	671,736		405,265		—		(1,077,001		)	—
Long-term debt	171,213		847,761		676,439		—			1,695,413
Other noncurrent liabilities	28,099		190,294		154,137		—			372,530
Stockholders’ equity	1,553,798		2,438,514		3,590,740		(6,029,361		)	1,553,691
Total liabilities and stockholders’ equity	$	2,443,265	$	4,383,806	$	4,908,920	$	(7,106,362	)	$	4,629,629

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,816,069		(1,816,069		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,142		3,415,896		31,745		(5,624,302		)	42,481
Total assets	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		4,809		190,463		—			203,069
Total current liabilities	7,797		428,318		409,731		—			845,846
Intercompany payables, net	668,447		1,147,622		—		(1,816,069		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,345,988		2,214,225		3,409,999		(5,624,302		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,417	$	4,141,423	$	4,157,983	$	(7,440,371	)	$	3,078,452

Condensed Financial Information, Statement of Income

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,442,714	$	3,265,007		$	(128,420	)	$	6,579,301
Cost of goods sold	—		2,738,941		2,637,334			(128,420		)	5,247,855
Selling, general and administrative expenses	59		593,400		367,555			—			961,014
Depreciation and amortization	—		15,208		22,353			—			37,561
Results of affiliates’ operations	235,467		184,947		—			(420,414		)	—
Interest expense, net	23,163		17,683		6,916			—			47,762
Loss on debt extinguishment	—		3,470		—			—			3,470
Provision for income taxes	10,486		23,493		45,901			—			79,880
Net income (loss)	201,759		235,466		184,948			(420,414		)	201,759
Less: Net loss attributable to noncontrolling interest	—		—		(18		)	—			(18		)
Net income (loss) attributable to WESCO International, Inc.	$	201,759	$	235,466	$	184,966		$	(420,414	)	$	201,777

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	3,230,753	$	2,998,639		$	(103,674	)	$	6,125,718
Cost of goods sold	—		2,585,978		2,406,845			(103,674		)	4,889,149
Selling, general and administrative expenses	70		546,902		325,011			—			871,983
Depreciation and amortization	—		11,996		19,611			—			31,607
Results of affiliates’ operations	229,621		176,581		—			(406,202		)	—
Interest expense, net	23,990		21,382		8,231			—			53,603
Provision for income taxes	9,321		11,455		62,360			—			83,136
Net income	196,240		229,621		176,581			(406,202		)	196,240
Less: Net loss attributable to noncontrolling interest	—		—		(11		)	—			(11		)
Net income attributable to WESCO International, Inc.	$	196,240	$	229,621	$	176,592		$	(406,202	)	$	196,251

CONDENSED CONSOLIDATING STATEMENTS OF INCOME (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.			Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,820,855		$	2,318,495	$	(75,488	)	$	5,063,862
Cost of goods sold	—		2,262,038			1,878,875		(75,488		)	4,065,425
Selling, general and administrative expenses	234		518,100			245,249		—			763,583
Depreciation and amortization	—		12,581			11,354		—			23,935
Results of affiliates’ operations	153,107		130,267			—		(283,374		)	—
Interest expense, net	27,565		22,291			7,707		—			57,563
Other income	—		(4,285		)	—		—			(4,285		)
Provision for income taxes	9,831		(12,708		)	45,041		—			42,164
Net income attributable to WESCO International, Inc.	$	115,477	$	153,105		$	130,269	$	(283,374	)	$	115,477

Condensed Financial Information, Statements of Cash Flows

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

	Year ended December 31, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(15,897	)	$	300,932		$	3,149		$	—		$	288,184
Investing activities:
Capital expenditures	—			(18,697		)	(4,387		)	—			(23,084		)
Acquisition payments	—			(142,483		)	(1,146,997		)	—			(1,289,480		)
Advances to subsidiaries and other	—			(1,149,143		)	1,558			1,149,143			1,558
Net cash used in investing activities	—			(1,310,323		)	(1,149,826		)	1,149,143			(1,311,006		)
Financing activities:
Net borrowings (repayments)	13,646			1,039,590			1,163,743			(1,149,143		)	1,067,836
Equity transactions	2,252			—			—			—			2,252
Other	—			(22,336		)	(3,704		)	—			(26,040		)
Net cash provided provided by financing activities	15,898			1,017,254			1,160,039			(1,149,143		)	1,044,048
Effect of exchange rate changes on cash and cash equivalents	—			—			1,004			—			1,004
Net change in cash and cash equivalents	1			7,863			14,366			—			22,230
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—			63,869
Cash and cash equivalents at the end of period	$	6		$	52,275		$	33,818		$	—		$	86,099

	Year ended December 31, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(19,823	)	$	181,348		$	6,008		$	—		$	167,533
Investing activities:
Capital expenditures	—			(28,602		)	(4,745		)	—			(33,347		)
Acquisition payments	—			(7,750		)	(40,343		)	—			(48,093		)
Advances to subsidiaries and other	—			(43,936		)	—			44,033			97
Net cash used in investing activities	—			(80,288		)	(45,088		)	44,033			(81,343		)
Financing activities:
Net borrowings (repayments)	21,840			(105,931		)	44,033			(44,033		)	(84,091		)
Equity transactions	(2,013		)	—			—			—			(2,013		)
Other	—			16,942			(1,746		)	—			15,196
Net cash provided (used) by financing activities	19,827			(88,989		)	42,287			(44,033		)	(70,908		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,990		)	—			(4,990		)
Net change in cash and cash equivalents	4			12,071			(1,783		)	—			10,292
Cash and cash equivalents at the beginning of year	1			32,341			21,235			—			53,577
Cash and cash equivalents at the end of period	$	5		$	44,412		$	19,452		$	—		$	63,869

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (continued)

	Year ended December 31, 2010
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash (used) provided by operating activities	$	(96,685	)	$	301,578		$	(77,610	)	$	—		$	127,283
Investing activities:
Capital expenditures	—			(12,903		)	(2,229		)	—			(15,132		)
Acquisition payments	—			(265,397		)	—			—			(265,397		)
Sale of subsidiary	—			40,000			—			—			40,000
Advances to subsidiaries and other	—			16,431			—			3,555			19,986
Net cash used in investing activities	—			(221,869		)	(2,229		)	3,555			(220,543		)
Financing activities:
Net borrowings (repayments)	92,350			(58,894		)	3,555			(3,555		)	33,456
Equity transactions	4,333			—			—			—			4,333
Other	—			(5,398		)	(1,756		)	—			(7,154		)
Net cash provided (used) by financing activities	96,683			(64,292		)	1,799			(3,555		)	30,635
Effect of exchange rate changes on cash and cash equivalents	—			—			3,873			—			3,873
Net change in cash and cash equivalents	(2		)	15,417			(74,167		)	—			(58,752		)
Cash and cash equivalents at the beginning of year	3			16,924			95,402			—			112,329
Cash and cash equivalents at the end of period	$	1		$	32,341		$	21,235		$	—		$	53,577

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EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

Defined Contribution Plans

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their service rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO will make contributions in an amount equal to 50% of the participant’s total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO will make contributions in an amount ranging from 1% to 7% of the participant’s eligible compensation based on years of continuous service. In addition, employer contributions may be made at the discretion of the Board of Directors. Discretionary employer contributions charges of $18.6 million, $16.2 million, and $14.2 million were incurred in 2012, 2011, and 2010, respectively. For the years ended December 31, 2012, 2011 and 2010, WESCO incurred charges of $31.8 million, $27.6 million, and $25.3 million, respectively, for all such plans. Contributions are made in cash to employee retirement savings plan accounts. Employees then have the option to transfer balances allocated to their accounts into any of the available investment options, including WESCO common stock.

Defined Benefit Plans

In connection with the December 14, 2012 acquisition of EECOL discussed in Note 5, the Company assumed a contributory defined benefit plan covering all employees of EECOL. The plan provides retirement benefits based on earnings and credited service, and participants may contribute 2% of their earnings to the plan. Participants become 100% vested after two years of continuous service.

The Company also assumed EECOL's Supplemental Executive Retirement Plan (SERP) which provides additional pension benefits to certain executives based on earnings, credited service, and executive service. Participants in the plan are vested after two years of continuous service and may contribute 4% of their earnings to the plan.

The following tables present the changes in benefit obligations, plan assets and funded status for the pension plans and the components of net periodic pension cost.

Year ended December 31, 2012 (In thousands)
Accumulated Benefit Obligation (ABO) at December 31	$	80,252
Change in Projected Benefit Obligation (PBO)
PBO at beginning of year	$	—
Effect of acquisition	102,829
Service cost	158
Interest cost	217
Participant contributions	85
Actuarial loss (gain), including assumption changes	277
Benefits paid	(100		)
PBO at end of year	$	103,466
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	—
Effect of acquisition	60,297
Actual return on plan assets	870
Employee contributions	85
Company contributions	298
Benefits paid	(100		)
Plan assets at end of year	$	61,450
Funded status	$	(42,016	)
Amounts recognized in the balance sheet
Current liabilities	$	(201	)
Non-current liabilities	(41,815		)
Net pension liability at end of year	$	(42,016	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	(414	)
Prior service cost	—
Total recognized in accumulated other comprehensive loss	$	(414	)

Year ended December 31, 2012 (In thousands)
Net Periodic Pension Cost
Service cost	$	158
Interest cost	217
Expected return on plan assets	(177		)
Total net periodic pension cost	$	198
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	(416	)
Total recognized in other comprehensive earnings	$	(416	)
Total recognized in net periodic pension cost and other comprehensive earnings	$	(218	)

Actuarial assumptions used to determine benefit obligations at December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Average salary increases	4.0	%	4.0	%

Actuarial assumptions used to determine net periodic pension cost for the year ended December 31, 2012 are as follows:

	Pension Plan		SERP
Discount rate	4.5	%	4.5	%
Expected return on long-term assets	6.3	%	n/a
Rate of compensation increase	4.0	%	4.0	%

The following benefit payments, which reflect expected future service, are expected to be paid:

Years ending December 31 (In thousands)
2013	$	1,921
2014	2,171
2015	2,568
2016	2,645
2017	2,734
2018-2023	16,724

The Company expects to contribute approximately $3.9 million to the plans in 2013.

The Company's pension plan weighted asset allocations as of December 31, 2012 by asset category are as follows:

Asset Category
Equity securities	57.7	%
Debt securities	42.3	%
	100.0	%

The Plan's long-term overall objective is to maintain benefits at their current level without affecting the cost of maintaining the plan, assuming that the demographic make-up of the group of members remains the same.

The primary investment objective, in support of the overall objective, is to earn the highest rate of return possible for the Plan, while keeping risk at acceptable levels. The long-term return objective of the Plan is to achieve a minimum annualized rate of return in excess of the actuarial requirements. This translates into a required return of 3.5% percent above inflation, net of investment management fees. The return objective is consistent with the overall investment risk level that the Plan assumes in order to meet the pension obligations of the Plan. To achieve this long term investment objective, the Plan has adopted an asset mix that has a combination of equity and fixed income investments. Risk is controlled by investing in a well-diversified portfolio of asset classes. To meet this objective, a benchmark portfolio is established based on the expected returns for each asset class available. The investment of the Plan's assets in accordance with the benchmark portfolio should enable the Plan to not only attain, but also exceed the minimum overall objective.

The following table presents the target asset mix based on market value for each investment category within which the investment managers must invest the Plan's assets. The manager is required to rebalance the asset mix back to the target on a quarterly basis.

Asset Category	Target %
Canadian equities	25	%
U.S. equities	15	%
Non-North American equities	20	%
Total equities	60	%
Fixed income bond managers	40	%

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (2) an entity's own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset and liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

The following section describes the valuation methodologies used by the trustees to measure the fair value of plan assets, including an indication of the level in the fair value hierarchy in which each type of asset is generally classified.

Equity Securities. These securities consist of the plan's share of segregated funds that invest in the stock of publicly traded companies and are valued at the net asset value of shares held at December 31. As such, these securities are generally included in Level 2.

Debt Securities. These securities consist of segregated funds that invest in publicly traded U.S and non-U.S. fixed interest obligations and government securities and are valued through consultation and evaluation with brokers in the institutional market using other observable market data. As such, these securities are generally included in Level 2. Also, these securities include cash and cash equivalents consisting of money market funds and are generally valued using quoted prices or observable market data. As such, these funds are included in Level 1.

The fair value methods described above may not be indicative of net realizable value or reflective of future fair values. Additionally, while the Company believes the valuation method used by the plan's trustee is appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The following table represents the fair value of plan assets classified under the appropriate level of fair value hierarchy:

	Level 1		Level 2		Level 3		Total
Equity securities	$	—	$	35,223	$	—	$	35,223
Debt securities	505		25,722		—		26,227
Total investments	$	505	$	60,945	$	—	$	61,450