Exhibit 21
SUBSIDIARIES OF THE REGISTRANT

Name | U.S. State or Country of Organization
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 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
Kawneer Commercial Windows LLC* | Pennsylvania
Kawneer Company Canada Limited* | Canada
Kawneer Company, Inc.* | Delaware
Kawneer France SAS | France
Kawneer Nederland B.V. | Netherlands
Kawneer U.K. Limited | United Kingdom
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.
*In 2022, the Registrant established two new subsidiaries in anticipation of the completion of a legal entity reorganization by the end of the calendar year. These two subsidiaries, Arconic US LLC and Arconic BCS Holdings LLC did not constitute, individually or in the aggregate, a significant subsidiary as of the end of the business day on December 31, 2022. Effective 11:59 p.m. Eastern Standard Time on December 31, 2022, the following mergers, dissolutions, and contributions occurred:
•Arconic Davenport LLC, Arconic Lafayette LLC, Arconic Lancaster Corp., Arconic Massena LLC, Arconic Tennessee LLC, and Pimalco, Inc. were merged into Arconic US LLC and were dissolved;
•Kawneer Commercial Windows LLC was merged into Kawneer Company, Inc. and was dissolved; and
•Arconic BCS Holdings LLC became the direct parent company of Arconic Architectural Products LLC, Kawneer Company Canada Limited, and Kawneer Company, Inc..