EX-21.1 6 d310826dex211.htm EX-21.1

Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

As of September 30, 2016

Subsidiary |  | Jurisdiction of Incorporation
Calumet Armature and Electric, L.L.C. HK Engine Components, LLC ICS Holdings LLC IES Commercial, Inc. IES Commercial & Industrial, LLC IES Consolidation, LLC IES Infrastructure Solutions, LLC IES Management, LP IES Management ROO, LP IES Operations Group, Inc. IES Properties, Inc. IES Purchasing & Materials, Inc. IES Renewable Energy, LLC IES Residential, Inc. IES Shared Services, Inc. IES Subsidiary Holdings, Inc. IES Tangible Properties, Inc. |  | Illinois Indiana Arizona Delaware Delaware Delaware Delaware Texas Texas Delaware Delaware Delaware Delaware Delaware Delaware Delaware Delaware
Integrated Electrical Finance, Inc. |  | Delaware
Key Electrical Supply, Inc. |  | Texas
Magnetech Industrial Services, Inc. |  | Indiana
Shanahan Mechanical and Electrical, Inc. Southern Industrial Sales and Services, Inc. STR Mechanical, LLC Technibus, Inc. |  | Nebraska Georgia North Carolina Delaware
Thomas Popp & Company |  | Ohio