Exhibit 21
SUBSIDIARIES OF THE REGISTRANT

Name | U.S. State or Country of Organization
Alti Forge Holding S.a.r.l. | Switzerland
Alti Forge JSC | Russian Federation
Alumax LLC | Delaware
Arconic Architectural Products LLC | Delaware
Arconic Architectural Products SAS | France
Arconic China Investment Company Ltd. | China
Arconic China Processing LLC | Delaware
Arconic Davenport LLC | Delaware
Arconic Extrusions Hannover GmbH | Germany
Arconic France Holding SAS | France
Arconic Hungary Finance Kft | Hungary
Arconic International Asia Ltd. | Hong Kong
Arconic Kofem Mill Products Kft | Hungary
Arconic Kunshan Aluminum Products Company, Ltd. | China
Arconic Lafayette LLC | Delaware
Arconic Lancaster Corp. | Delaware
Arconic Manufacturing GB Limited | United Kingdom
Arconic Massena LLC | Delaware
Arconic Nederland Holding B.V. | Netherlands
Arconic Qinhuangdao Aluminum Industries Co., Ltd. | China
Arconic Technologies LLC | Delaware
Arconic Tennessee LLC | Delaware
Arconic UK Finance | United Kingdom
Arconic UK Holdings Limited | United Kingdom
JSC Arconic SMZ | Russia Federation
Kawneer Aluminium Deutschland, Inc. | Delaware
Kawneer Commercial Windows LLC | Pennsylvania
Kawneer Company Canada Limited | Canada
Kawneer Company, Inc. | Delaware
Kawneer France S.A. | France
Kawneer Nederland B.V. | Netherlands
Kawneer U.K. Limited | United Kingdom
OOO Arconic Rus Investment Holdings | Russian Federation
Pimalco, Inc. | Arizona

The names of particular subsidiaries have been omitted because, considered in the aggregate as a single subsidiary, they would not constitute, as of the end of the year covered by this report, a “significant subsidiary” as defined in Regulation S-X under the Securities Exchange Act of 1934, as amended.