Exhibit 21
GRAYBAR ELECTRIC COMPANY, INC.
LIST OF SUBSIDIARIES
Graybar International, Inc., a Missouri corporation
Graybar Financial Services, Inc., a Missouri corporation
Graybar Management Services, LLC, a Delaware limited liability company
Graybar Electric Limited, a Nova Scotia corporation
Graybar Canada Limited, a Nova Scotia corporation
Électro-Mag Inc., a Quebec corporation
Les Contrôles J.A.D. Inc., a Quebec corporation
Distribution Associates, Inc., a Missouri corporation
Graybar Business Services, Inc., a Missouri corporation
Graybar Electric Canada Limited, a Nova Scotia corporation
Graybar Newfoundland Limited, a Newfoundland and Labrador corporation
Graybar Energy Limited, an Ontario corporation
Advantage Industrial Automation, Inc., a Georgia corporation
Cape Electrical Supply LLC, a Delaware limited liability company
Lab Development, LLC (d/b/a Connexion), an Illinois limited liability company
St. Louis-Metro Electric Supply, Inc., a Missouri corporation
Shepherd Electric Company, LLC, a Maryland limited liability company
Shepherd Electric Supply of Washington DC, LLC, a Delaware limited liability company
Shingle & Gibb Automation, LLC, a Delaware limited liability company
Valin Corporation, a California corporation
USAutomation, a California corporation
The Filter Factory, Inc., a Delaware corporation
Walker Industrial Products, Inc., a Connecticut corporation
Steven Engineering, Incorporated, a California corporation