The Cianbro Companies are a group of American privately held companies providing construction and construction services, construction equipment rental, and engineering. The company is headquartered in Pittsfield, Maine, and has offices and facilities throughout the United States. Cianbro has been in business since 1949 and has grown to become one of the largest and most diverse open-shop construction and construction services companies in the United States. The company is employee-owned and has been recognized as one of the best places to work in Maine.