DBpedia

DBpedia (.org) is a community effort to extract structured information from Wikipedia and to make this information available on the Web. The datasets made by DBpedia can be queried with w:SPARQL language if MediaWiki/Extensions#LinkedWiki extension is installed on a mediawiki. This way lot of company information ( Founded in year, type of business entity etc. etc. ) can be fetched from datasets of infobox data on the 'pedia.

http://wiki.dbpedia.org/Datasets contains information on the available datasets such as Wikipedia infobox templates and categories

DBpedia datasets can be used in Consumium implementation wiki through the LinkedWiki extension

http://wiki.dbpedia.org/Ontology contains for example information about 169,000 organizations

Dbpedia infobox dataset contains information about 40,000 companies

http://dbpedia.org/sparql - contains ability to formulate SPARQL queries against DBpedia's datasets