Nicor
 Nicor Inc. is an energy and shipping company headquartered in Naperville Illinois. Its largest subsidiary Nicor Gas is a natural gas distribution company. Founded in 1954 the company serves more than two million customers in a service territory that encompasses most of the northern third of Illinois excluding the city of Chicago. Nicor has 32000 miles (51000 km) of pipelines.Nicor's next largest subsidiary is Tropical Shipping.