WBI Holdings consists of a group of energy and energy-related operations involved in two strategically related lines of business:

• Pipeline and energy services
• Natural gas and oil production

WBI Holdings is a vertically integrated group of companies providing essential services to the energy industry and is an indirect wholly owned subsidiary of MDU Resources Group (NYSE: MDU), a Fortune 500 company and a member of the S&P MidCap 400 index.

WBI Holdings' family of companies includes:

• Williston Basin Interstate Pipeline Company
• Bitter Creek Pipelines
• Total Corrosion Solutions
• Fidelity Exploration & Production Company
• Prairielands Energy Marketing