Exhibit 21
Subsidiaries of the Registrant

Name of Subsidiary | Jurisdiction of Incorporation
Amrize ACM Inc. | Delaware
Amrize Building Envelope LLC | Indiana
Amrize Canada Inc. | Canada
Amrize Cement Inc. | Delaware
Amrize Finance Switzerland LLC | Switzerland
Amrize Finance US LLC | Delaware
Amrize Great Lakes Inc. | Delaware
Amrize Holdings Switzerland LLC | Switzerland
Amrize Mid-America Inc. | Illinois
Amrize Mid-Atlantic Inc. | Maryland
Amrize Midwest Inc. | Minnesota
Amrize North America Inc. | Delaware
Amrize Northeast Inc. | Massachusetts
Amrize South Central Inc. | Texas
Amrize Southwest Inc. | Nevada
Amrize Technology Switzerland LLC | Switzerland
Amrize Trading Inc. | Florida
Amrize Ventures Switzerland LLC | Switzerland
Amrize West Central Inc. | Colorado
Geocycle Canada Inc. | Canada
Geocycle LLC | Michigan
Herbert Malarkey Roofing Company | Oregon
Innocon Partnership (55%)* | Ontario
Jamaica Aggregates Ltd. (95%)* | Jamaica
North America Shared Services S.A.S. | Colombia

* The Registrant owns a less than 100% equity interest in the entity.
Certain subsidiaries were omitted pursuant to Item 601(b)(21)(ii) of the SEC's Regulation S-K.