CONSOL Energy Inc. (CEIX)
CONSOL Energy Inc., together with its subsidiaries, produces and sells bituminous coal in the United States and internationally.
Hallador Energy Company (HNRG)
Hallador Energy Company, through its subsidiaries, engages in the production of steam coal in the State of Indiana for the electric power generation industry.
NACCO Industries, Inc. (NC)
NACCO Industries, Inc., together with its subsidiaries, engages in the natural resources business.