Northern Oil & Gas, Inc.
A Minnesota-based energy company that buys minority stakes in oil and gas wells rather than drilling them itself, making it the largest publicly traded "non-operated" oil producer in the United States. Founded in 2006 by Michael Reger, the company's name reflects its early focus on the northern Williston Basin's Bakken and Three Forks formations in North Dakota and Montana. Fun fact: despite its oil-field roots, its headquarters sits in suburban Minneapolis, far from the wells it owns.