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
GBE Sub, LLC, a Missouri 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 Electrical Supply, Inc., a Missouri corporation
Shingle & Gibb Automation, LLC, a Delaware limited liability company
Steven Engineering Incorporated, a California corporation
Process Distribution Group, a California corporation
Valin Corporation, a California corporation
The Filter Factory Inc., a California corporation
USAutomation, a California corporation
Shepherd Electric Company, LLC, a Maryland limited liability company
Shepherd Electric Supply of Washington D.C., LLC, a Delaware limited liability company
Blazer Electric Supply Management Co., a Colorado corporation
Blazer Electric Supply Co. of Colorado Springs, a Colorado corporation
Blazer Electric Supply Co. of Pueblo, a Colorado corporation