The engineering and construction conglomerate (also known as the Ledcor Group of Companies) holds a network of firms focused on large-scale projects in Canada and the US. The group operates through divisions that specialize in commercial building, heavy civil, industrial, contract mining, and pipeline construction. Ledcor builds condos, office buildings, airports, highways, and industrial complexes; provides mining excavation; and offers network equipment installation, network site maintenance, and fiber-optic cable maintenance. Subsidiary Ledcor Properties invests in real estate. Employee-owned Ledcor was founded in 1947 by William Lede, the father of CEO Dave Lede.

Lum Chang Holdings invests in, develops, builds, and renovates commercial, civil, and institutional properties, primarily in Singapore and the Pacific Rim. It also develops luxury residential properties in Singapore and, with joint venture partner GIC Real Estate, in Malaysia. Its portfolio includes upscale condominiums, bungalows, and golf resorts and country clubs. Another partnership with Tokyo-based Nishimatsu Construction provides construction on Singapore's mass transit system. The company's Lum Chang Building Contractors subsidiary was established in the 1940s and has become one of Singapore's largest construction firms.

Rosboro Lumber is deeply rooted in building supplies. The company produces a wide variety of products, including studs and plywood for the homebuilding market, laminated beams and frames for heavy construction, and hardwood door and window frames through subsidiary Washington Hardwoods. The company owns timberlands in western Oregon; it also buys timber from other public and private land owners. Rosboro operates about a half-dozen production facilities. It sells its products to customers in the US, Canada, Latin America, and Japan. A group of about 60 investors owns Rosboro. T. W. "Whit" Rosborough founded the company as a small lumber mill in the 1930s.

Imperial Industries, Inc., together with its subsidiaries, engages in the manufacture and distribution of building materials to dealers and others located primarily in Florida, as well as other states in the southeastern United States. It offers exterior and interior finishing wall coatings and mortar products for the construction industry, as well as purchases and resells building materials from other manufacturers. The company produces and distributes pool finish coatings for in-ground swimming pools; roof tile mortar to adhere cement roof tiles to the roof; stucco products that are applied as a finishing coat to exterior surfaces; and plaster products to finish interiors of structures.

Perma-Fix Environmental Services, Inc., through its subsidiaries, operates as an environmental and technology know-how company in the United States. It operates through three segments: Nuclear Waste Management Services (Nuclear Segment), Consulting Engineering Services (Engineering Segment), and Industrial Waste Management Services (Industrial Segment). The Nuclear Segment provides nuclear waste management services, such as treatment, storage, processing, and disposal of low-level radioactive and hazardous waste; on and off-site waste remediation and processing; nuclear, low-level radioactive, and mixed waste treatment, as well as processing and disposal; and research and development of ways to process low-level radioactive and mixed waste. The Engineering Segment offers consulting engineering services, which include consulting services regarding air, water, and hazardous waste permitting; air, soil, and water sampling; compliance reporting, emission reduction strategies, compliance auditing, and various compliance and training activities, as well as provides engineering and compliance support services. The Industrial Segment provides industrial waste management services, including treatment, storage, processing, and disposal of hazardous and non-hazardous waste; wastewater management services, including the collection, treatment, processing and disposal of hazardous and non-hazardous wastewater; and treatment, processing, recycling, and sale of used oil and other off-specification petroleum-based products. It services research institutions, commercial companies, public utilities, and governmental agencies, including the Department of Energy and Department of Defense. The company offers its services directly to customers or via intermediaries. Perma-Fix Environmental Services, Inc. was founded in 1990 and is based in Atlanta, Georgia.

Boh Bros. builds bridges in the Big Easy and beyond. One of the top industrial and heavy construction contractors in the Southeast, Boh Bros. Construction has been building in and around New Orleans for about a century. The firm was created in 1909 by Arthur Boh, whose brother Henry joined the company in 1913 to give it the "Bros." name. Boh Bros. became known for its pile-driving and underground work. The company has expanded both geographically and its services, providing asphalt and concrete paving, mechanical and industrial piping, marine construction, highway and railroad construction, equipment sales, and excavation and site preparation in nine states. The Boh family and key employees own the firm.

Veridian Homes wants to paint the town green. As an environmental steward, Veridian Homes builds communities with homes that are both Energy Star- and Green Built Home-certified. Those homes must meet strict standards set by the US Environmental Protection Agency. Veridian offers more than 40 floor plans (with such distinguished names as The Bentley, The Carter, The Everest, and The Oxford) for single-family detached homes as well as condominiums in about 20 neighborhoods in Dane County and Madison, Wisconsin. The company also supports buyers in home plan selection, interior design modifications, and financing.

Revcor blows hot and cold. The company utilizes advanced airflow technology to manufacture metal and plastic wheels, fans, and blowers for use in the heating and air conditioning, automotive, and off-road original equipment manufacturer markets. Revcor's products include the Revolutionary Air Flow and SmoothFlow Systems. The company also offers system analysis and project software. Revcor products are manufactured at a plant in Carpentersville, Illinois (near Chicago) and an axial fan assembly facility with other manufacturing capabilities in Mexico.

Roesling Nakamura Terada Architects provides architectural design services to customers in California. The company's offerings include planning, implementation, renovation, urban design, site studies, interior design, and program management. The firm operates from offices in Oxnard and San Diego, California; it also has a sister office, Gelfand Partners, in San Francisco. Ralph Roesling founded the firm in 1980; Kotaro Nakamura joined the company shortly thereafter. The firm changed its name from Roesling Nakamura Architects to Roesling Nakamura Terada Architects in 2004.

Engineering and consulting firm KEMRON Environmental Services provides analytical testing, consulting, emergency response, environmental assessment and engineering, geotechnical testing, and site remediation. Customers include branches of the US military and other federal agencies. Its client base also includes private sector companies ranging from small businesses to major manufacturers and FORTUNE 500 companies. KEMRON operates from offices in Georgia, Illinois, Ohio, Virginia, Washington, and West Virginia. The company is owned by its employees.

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