Garlik http://www.garlik.com/ uses Semantic Web technology in its DataPatrol product to track personal information for customers in the United Kingdom, and plans to expand its services to other markets.
The article "Garlik applies Semantic technology to consumer data (UK startup wards off ID thieves by tracking identity data)" http://www.infoworld.com/t/platforms/garlik-applies-semantic-technology-... provides a good overview Garliks use of Semantic technology, e.g. selectively harvesting RDF metadata from the web.
Garlik is also described in the presentation Semantic Web Technologies in Practice http://clarkparsia.com/talks/semweb-tech-in-practice/ . Garlik makes extensive use of SPARQL in building its reports.