Company Story
1924 - MDU Resources Group, Inc. was founded as a small electrical contracting firm in Minneapolis, Minnesota.
1946 - The company began to expand its operations to include construction and excavation work.
1953 - MDU Resources Group, Inc. went public with an initial public offering (IPO).
1968 - The company acquired its first utility, Montana-Dakota Utilities Co.
1972 - MDU Resources Group, Inc. expanded into the natural gas business with the acquisition of Intermountain Gas Company.
1985 - The company acquired Knife River Corporation, a construction materials and contracting company.
1992 - MDU Resources Group, Inc. acquired its first pipeline, the Williston Basin Pipeline.
2002 - The company acquired the remaining interest in Intermountain Gas Company.
2008 - MDU Resources Group, Inc. acquired the construction company, Perfection Mechanical.
2014 - The company acquired the pipeline and logistics company, WBI Holdings, Inc.