Castle Engineering is a Chicago-based professional services company specializing in engineering and technical services across various sectors, particularly in the food and beverage industry. Established in 1956, the company offers a comprehensive range of solutions, including mechanical, industrial, packaging, and process engineering. Castle Engineering provides expertise in 3D computer-aided design (CAD) and supports projects from research and development to manufacturing processes, ensuring efficiency and productivity enhancements. The company also offers professional technical services that allow businesses and research laboratories to outsource unique project and workforce needs, focusing on confidentiality and quality. Specializations include regulatory compliance, nutrition, quality assurance, labeling, packaging, and specification development. As a service provider, Castle Engineering is dedicated to leveraging modern technology and highly skilled professionals to deliver innovative engineering solutions tailored to client needs.

Facility Engineering Services is a manufacturer and service provider specializing in the design, installation, integration, and maintenance of facility subsystems, including HVAC, access control, security/surveillance, smoke control, and lighting. The company provides industry-leading products and services globally, focusing on building automation, energy management systems, and direct digital controls. With an experienced team of control instrumentation technicians and energy engineers, Facility Engineering Services aims to enhance facility performance through its comprehensive facilities support solutions.

FCE is a professional engineering firm based in Santa Cruz, California, specializing in civil engineering, low impact development, and green infrastructure. The company offers a range of services including decentralized wastewater treatment and water reclamation, water supply treatment, storage and distribution, and water resources engineering. FCE also focuses on ecological and restoration engineering, land analysis and constraints mapping, as well as international development and consulting. Committed to project success, FCE employs state-of-the-art techniques to deliver comprehensive design solutions for various projects, from preliminary planning to final build out. FCE operates as a service provider in the engineering sector.

Castle Engineering is a precision engineering manufacturer based in Nottinghamshire, with an additional facility in Chomutov, Czech Republic. Established in 1972, the company specializes in high-quality machined components, offering turnkey solutions across diverse industries, including Nuclear, Aerospace, and Printing and Labelling. Castle Engineering focuses on CNC milling, turning, sliding head CNC, and CNC machining, and prides itself on a comprehensive quality assurance process that includes material tracking and metallurgical profiling. The company emphasizes close collaboration with clients from design through production to meet specific needs and ensure satisfaction.

Whitecastle Engineering Ltd (WEL) is an independent consultancy firm specializing in high-value engineering solutions for the oil and gas and petrochemical sectors. The company operates across Europe, North America, the Middle East, and South America, focusing on the optimization and project delivery of complex thermo-mechanical production systems throughout an asset's lifecycle. WEL offers services including design, selection, specification, front-end engineering design (FEED), detailed engineering, troubleshooting, debottlenecking, rerating, and risk assessments. Their expertise covers critical machinery and production systems such as power plants, gas compression, pipelines, and renewable power generation. With a commitment to delivering measurable results, WEL combines industry knowledge, best practices, and technological resources to provide sustainable solutions that enhance clients' business operations.

FEA is an international engineering and facility management consulting firm that specializes in providing customized solutions for the maintenance and management of existing facilities. The company offers a range of services including condition assessments, energy management and sustainability audits, LEED consulting, repair and restoration, and business continuity planning. FEA employs systematic methodologies to deliver accurate data for financial forecasting and funding requests while enhancing accessibility through the use of ARIA attributes in their reporting. Their innovative dashboard reports prioritize funding for repair and renewal, ensuring long-term asset management.