• Professional Services Industries Inc.
• SES group of companies
• Siemens Industries, Inc.
• Stanley Consultants Inc.
• Stantec, Inc.
• Surveying And Mapping, LLC
• Terracon Consultants, Inc.
• Tetra Tech, Inc.
• The Ross Group Construction Corp.
• Tremco Commercial Sealants and Waterproofing

• Parsons
• PB&A, Inc.
• PIKA International
• Pond & Company
• PRIME AE Group, Inc
• RS&H, Inc.
• RSP Architects, Ltd.
• SAME
• Secord & Lebow Architects, LLP