| | | | | | | | |
| | |
| | Jurisdiction of |
| Subsidiaries(1) | | Incorporation |
| 2704026 Ontario Ltd | | Ontario |
| All-Wall Equipment Company Inc | | Washington |
| Ames Tools Canada Corporation | | New Brunswick |
| Ames Tools Corporation | | Delaware |
| Canada Gypsum Management and Supply, Inc. | | British Columbia |
| Capitol Building Supply, Inc. | | Virginia |
| Capitol Materials, Incorporated | | Georgia |
| Cherokee Building Materials, Inc. | | Oklahoma |
| Chicago Gypsum Supply, Inc. | | Georgia |
| Cowtown Materials, Inc. | | Texas |
| D.L. Building Materials Inc. | | Canada |
| Empire Construction Supply, Inc. | | Georgia |
| GMS Canada Lumber Corp. | | British Columbia |
| GMS Southeast, Inc. | | Florida |
| GMS Strategic Solutions, Inc. | | Georgia |
| GTS Drywall Supply Company | | Washington |
| GYP Canada Finance LP | | Ontario |
| GYP Canada Holdings I ULC | | British Columbia |
| GYP Canada Holdings III Corp. | | British Columbia |
| GYP Holdings II Corp. | | Delaware |
| GYP Holdings III Corp. | | Delaware |
| GYP Holdings IV Corp. | | Delaware |
| GYP Holdings V Corp. | | Delaware |
| GYP Holdings IV (Barbados) SRL | | Barbados |
| Gypsum Management and Supply, Inc. | | Georgia |
| Gypsum Supply Installed Insulation, LLC | | Georgia |
| Laminated Glass Technologies, Inc. | | Ontario |
| Missouri Drywall Supply, Inc. | | Missouri |
| Pacific Gypsum Supply, Inc. | | Georgia |
| PGS-Westside I, Inc. | | Georgia |
| PGS-Westside II, Inc. | | Georgia |
| Pioneer Materials West, Inc. | | Colorado |
| Right-Fit Foam Insulation Ltd. | | Ontario |
| Sun Valley Interior Supply, Inc. | | Georgia |
| Tamarack Materials, Inc. | | Minnesota |
| Titan GMS GP Inc. | | British Columbia |
| Titan GMS Limited Partnership | | Manitoba |
| Tool Source Warehouse, Inc. | | Georgia |
| Tucker Acoustical Products, Inc. | | Georgia |
| WSB Titan Inc. | | Canada |