Exhibit 21
SUBSIDIARIES OF SUMMIT MATERIALS, INC.
SUBSIDIARIES OF SUMMIT MATERIALS, LLC
(as of February 16, 2023)
| Name | Jurisdiction of Incorporation or Organization | |||||||
| Alan Ritchey Materials Company, L.C. | Oklahoma | |||||||
| Alleyton Resource Company, LLC | Delaware | |||||||
| Alleyton Services Company, LLC | Delaware | |||||||
| American Materials Company, LLC | North Carolina | |||||||
| AMI Associates, LC | Utah | |||||||
| Asphalt Materials, LLC | Utah | |||||||
| Austin Materials, LLC | Delaware | |||||||
| B&B Resources, Inc. | Utah | |||||||
| Boxley Materials Company | Virginia | |||||||
| Buckingham Slate Company, LLC | Virginia | |||||||
| Buckingham Slate #1, LLC | Virginia | |||||||
| Buckingham Slate #2, LLC | Virginia | |||||||
| Buildex, LLC | Delaware | |||||||
| Colorado County Sand & Gravel Co., L.L.C. | Texas | |||||||
| Columbia Aggregates, LLC | South Carolina | |||||||
| Con-Agg Companies, LLC | Missouri | |||||||
| Concrete Supply of Topeka, LLC | Kansas | |||||||
| Continental Cement Company, L.L.C. | Delaware | |||||||
| Cornejo & Sons, L.L.C. | Kansas | |||||||
| Elam Construction, Inc. | Colorado | |||||||
| Florida Stone Products, LLC | Delaware | |||||||
| Georgia Stone Products, LLC | Georgia | |||||||
| Glasscock Company, Inc. | South Carolina | |||||||
| Glasscock Logistics Company, LLC | South Carolina | |||||||
| Green America Recycling, LLC | Missouri | |||||||
| Hamm, Inc. | Kansas | |||||||
| H.C. Rustin Corporation | Oklahoma | |||||||
| Industrial Asphalt, LLC | Texas | |||||||
| Jefferson Quarry, LLC | Georgia | |||||||
| Kilgore Companies, LLC | Delaware | |||||||
| Kilgore Partners, L.P. | Utah | |||||||
| Lanier Construction Company, LLC | South Carolina | |||||||
| Laredo Paving, Inc. | Texas | |||||||
| LeGrand Johnson Construction Co. | Utah | |||||||
| Lewis & Lewis, Inc. | Wyoming | |||||||
| Mainland Construction Materials ULC | British Columbia | |||||||
| Metro Ready Mix, L.L.C. | Utah | |||||||
| Mid-Missouri Limestone, LLC | Missouri | |||||||
| Multisource Sand and Gravel Co., Ltd. | Texas | |||||||
| N.R. Hamm Contractor, LLC | Kansas | |||||||
| N.R. Hamm Quarry, LLC | Kansas | |||||||
| Northwest Aggregates, Inc. | Colorado | |||||||
| Northwest Ready Mix, Inc. | Colorado | |||||||
| Peak Materials, LLC | Delaware | |||||||
| Peak Ready Mix, LLC | New Mexico | |||||||
| Penny’s Concrete and Ready Mix, L.L.C. | Kansas | |||||||
| Price Construction, Ltd. | Texas | |||||||
| RK Hall, LLC | Delaware | |||||||
| SAGE, L.L.C. | Texas | |||||||
| SCS Materials, LLC | Texas | |||||||
| Sierra Ready Mix Limited Liability Company | Nevada | |||||||
| Stoner Sand, L.L.C. | Missouri | |||||||
| Summit Finance Group, LLC | Delaware | |||||||
| Summit Materials Corporations I, Inc. | Delaware | |||||||
| Summit Materials Finance Corp. | Delaware | |||||||
| Summit Materials Holdings, LLC(1) | Delaware | |||||||
| Summit Materials Holdings L.P.(1) | Delaware | |||||||
| Summit Materials Intermediate Holdings, LLC(1) | Delaware | |||||||
| Summit Materials International, LLC | Delaware | |||||||
| Summit Materials, LLC(1) | Delaware | |||||||
| Troy Vines, Inc. | Texas | |||||||
| Valley Real Estate Holdings, LLC | Virginia | |||||||
| Walker Sand & Gravel Ltd. Co. | Idaho | |||||||
| XIT Sand and Gravel, LLC | Texas | |||||||
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(1) Subsidiary of Summit Materials, Inc. but not of Summit Materials, LLC.