Defunct engineering companies of the United States

American corporation involved in mainly aerospace, electronics, automotive, and credit reporting, etc.

AlliedSignal was an American aerospace, automotive and engineering company, created through the 1985 merger of Allied Corp. and The Signal Companies. It purchased Honeywell for $14.8 billion in 1999, and adopted the Honeywell name and identity.

thumb|CH2M Hill offices at the Parkside Tower in Salt Lake City, Utah (2013) thumb|right|The former VECO building, now CH2M Hill's Alaska headquarters (2011) CH2M, earlier CH2M HILL, Inc., was an American engineering company that provided consulting, design, construction, and operations services for corporations and governments. The company was organized in Corvallis, Oregon, and headquartered at 9191 South Jamaica Street, Englewood, Colorado. In December 2017, the company was acquired by Jacobs Engineering Group.