Ergon, Inc. is an energy service company that manufactures and markets asphalt, asphalt emulsions, and specialty oils as its primary products. Ergon transports these products and those of other companies through its trucking, rail and marine transportation companies. In addition, Ergon is a manufacturer of industry-leading file servers, and has holding in other technology concerns.
Plains All American Pipeline, L.P. is engaged in interstate and intrastate
crude oil transportation, and crude oil gathering, marketing, terminalling and
storage, as well as the marketing and storage of liquefied petroleum gas and
other petroleum products, primarily in Texas, California, Oklahoma, Kansas,
Louisiana and the Canadian Provinces of Alberta and Saskatchewan. The
Partnership's common units are traded on the New York Stock Exchange under the
symbol "PAA". The Partnership is headquartered in Houston, Texas.
StealthGas Inc is an international shipping company specializing in the transportation of petroleum and petrochemical liquefied gas products, and is the world's largest owner of LPG pressurized carriers in the 3,000-8,000 cbm segment.
TEPPCO Partners, L.P. operates one of the largest common carrier pipelines of refined petroleum products and liquefied petroleum gases in the United States, along with petrochemical, natural gas liquid, and crude oil pipelines and related assets.