Alliance Resource Partners is a natural resource company. The company is a coal producer in the eastern United States. The company markets its coal production to main domestic and international utilities and industrial users. The company has two reportable segments: Illinois Basin, which comprises of multiple operating segments, including operating mining complexes Webster County Coal's Dotiki mining complex, Gibson County Coal's mining complex, River View's mining complex and the Hamilton mining complex; and Appalachia, which comprises of multiple operating segments, including the Mettiki mining complex, the Tunnel Ridge mining complex, the MC Mining mining complex and the Penn Ridge property.

Arch Coal is a coal producer. The company's main business is the production of thermal and metallurgical coal from surface and underground mines located throughout the United Staets, for sale to utility, industrial and steel producers both in the United States and around the world. The company's segments are based on two lines of business, metallurgical coal and thermal coal, and may include a number of mine complexes. The company's segments are: the Powder River Basin, containing primary thermal operations in Wyoming; the Metallurgical, containing metallurgical operations in West Virginia; and the Other Thermal, containing supplementary thermal operations in Colorado and Illinois.

Cameco and its subsidiaries are engaged in the exploration for and the development, mining, refining, conversion and fabrication of uranium for sale as fuel for generating electricity in nuclear power reactors in Canada and other countries. Co. has three reportable segments: uranium, which explores for, mines, mills, purchases, and sells uranium concentrate; fuel services, which refines, converts and fabricates uranium concentrate, and purchases and sells conversion services; and electricity, which generates and sells electricity through its 31.6% interest in the Bruce Power Limited Partnership, which operates four nuclear reactors and manages the overall site in southern Ontario.

Centrus Energy is a supplier of nuclear fuel and services for the nuclear power industry. The company operates two business segments: low-enriched uranium (LEU), which supplies various components of nuclear fuel to utilities; and contract services, which provides engineering, design, and manufacturing services to government and private sector customers. The company's LEU business involves the sale of low-enriched uranium, its components, and natural uranium to utilities operating commercial nuclear power plants. LEU is a component in the production of nuclear fuel for reactors that produce electricity. The company supplies LEU to both domestic and international utilities for use in nuclear reactors.

Costamare is an international owner of containerships. Co. is engaged in chartering vessels to many of the world's liner companies. As of Feb 23 2018, Co. has a fleet of 71 containerships with a total capacity in excess of 466,000 twenty foot equivalent units (TEUs). Co.'s strategy is to time charter its containerships to a geographically diverse, financially strong and loyal group of liner companies. Co.'s containerships operate primarily under multi-year charters and therefore are not subject to the effect of seasonal variations in demand. Some of Co.'s customers are A.P. Moller-Maersk, MSC, Evergreen, Hapag Lloyd and COSCO.

Denison Mines is engaged in uranium mining and related activities, including the acquisition, exporation and development of uranium bearing properties and the extraction, processing and selling of uranium. The environmental services division of Co. provides mine decommissioning and decommissioned site monitoring services for third parties. Co. is also in the business of recycling uranium-bearing waste materials, referred to as "alternate feed materials", for the recovery of uranium, alone or in combination with other metals.

Energy Fuels is engaged in uranium mining, milling, development, and exploration with operating uranium mines, mines on standby, development projects and exploration properties located in the United States. Co.'s assets include its 100% ownership of the White Mesa Mill in Utah. Co. also produces vanadium as a co-product from some of its mines in Colorado and Utah. In addition, Co. recycles uranium-bearing waste materials, referred to as "alternate feed materials", for the recovery of uranium, alone or in combination with other metals, at its White Mesa Mill.

Global Ship Lease is a holding company. Through its subsidiaries, the company is engaged in the business of owning and chartering out containerships under fixed rate charters to container liner companies.

Hallador Energy is engaged in the production of steam coal from mines located in western Indiana. The company also owns a 50% interest in Sunrise Energy, LLC, a private gas exploration company with operations in Indiana. Additionally, the company owns 100% of Hourglass Sands, LLC, a frac sand mining company in the State of Colorado.

Matson is a holding company engaged in the provision of ocean transportation and logistics services. The company's Ocean transportation segment business is conducted through Matson Navigation Company, Inc., which provides a lifeline of ocean freight transportation services to the domestic non-contiguous economies of Hawaii, Alaska and Guam, and to other island economies in Micronesia and operates an expedited service from China to Long Beach, CA, and provides services to Okinawa, Japan and various islands in the South Pacific. The company's Logistics business is conducted through Matson Logistics, Inc., an asset-light business that provides a variety of logistics services to its customers.

Navios Maritime Partners L.P. is an international owner and operator of dry cargo and container vessels. The Company is engaged in the seaborne transportation services of a range of dry cargo commodities, including iron ore, coal, grain and fertilizer, and also containers, chartering its vessels under medium to long-term charters. It focuses on providing seaborne shipping services under long-term time charters. As of December 31, 2016, it controlled 12 Panamax vessels, nine Capesize vessels, three Ultra-Handymax vessels and seven container vessels. Panamax vessels are vessels capable of carrying a range of dry cargo commodities, including iron ore, coal, grain and fertilizer and being accommodated in various discharge ports. Capesize vessels are dedicated to the carriage of iron ore and coal. Ultra-Handymax vessels are similar to Panamax vessels although with less carrying capacity, and have self-loading and discharging gear on board to accommodate undeveloped ports.

Peabody Energy is a coal company, engaged in the mining of thermal coal for sale primarily to electric utilities and metallurgical coal for sale to industrial customers. The company owns interests in several coal mining operations located in the U.S. and Australia. The company has a majority interest in several of those mining operations and an equity interest in Middlemount Coal Pty Ltd. (Middlemount), which owns the Middlemount Mine in Queensland, Australia. In addition to its mining operations, the company markets and brokers coal from other coal producers, both as principal and agent, and trade coal and freight-related contracts through trading and business offices in the U.S., Australia, China, and the U.K.

Ramaco Resources is a holding company. Through its subsidiaries, the company is an operator and developer of metallurgical coal in southern West Virginia, southwestern Virginia, and southwestern Pennsylvania. The company's near-term development portfolio includes four primary assets: Elk Creek, Berwind, RAM Mine and Knox Creek.

Safe Bulkers is an international provider of marine drybulk transportation services, transporting bulk cargoes, particularly coal, grain and iron ore, along worldwide shipping routes for consumers of marine drybulk transportation services. As of Feb. 9, 2018, Co. had a fleet of 39 drybulk vessels, with an aggregate carrying capacity of 3,513,800 dwt and an average age of 7.6 years. Co. deploys its vessels on both period time charters and spot time charters. The vessels on period time charters provide Co. with relatively stable cash flow and utilization rates, while the vessels in the spot market allow Co. to maintain its flexibility in low charter market conditions.

Star Bulk Carriers is an international company providing worldwide transportation solutions in the drybulk sector through its vessels-owning subsidiaries for a range of customers of major and minor bulk cargoes including iron ore, coal, grain, cement, fertilizer, along worldwide shipping routes. As of Dec 31 2016, Co. owned and operated a fleet of 73 vessels consisting primarily of Newcastlemax, Capesize as well as Kamsarmax, Ultramax and Supramax vessels with a carrying capacity between 52,055 dwt and 209,537 dwt. Co.'s vessels transport a range of major and minor bulk commodities, including ores, coal, grains and fertilizers, along worldwide shipping routes.