WESCO International is a publicly traded Fortune 500 holding company. Its primary operating entity is WESCO Distribution. WESCO Distribution is a leading distributor of electrical construction products, and electrical and industrial maintenance, repair and operating supplies. It is also one of the nation's largest providers of integrated supply services with 2004 annual product sales of approximately $3.7 billion. The company employs approximately 5,350 people, maintains relationships with 24,000 suppliers and serves more than 100,000 customers worldwide. Major markets include commercial and industrial firms, contractors, government agencies, educational institutions, telecommunications businesses and utilities. WESCO operates five fully automated distribution centers and approximately 350 full-service branches in North America and selected international markets. WESCO International maintains its headquarters in Pittsburgh.