Guarsmark is a major provider of security services in North America, Puerto Rico and the United Kingdom. Guardsmark is the fourth largest security company and the only major provider that is privately held. The family-run company employs more than 18,900 with reported revenues of more than $510,000,000 in 2005. It claims to be one of the largest employers of former FBI agents in the United States as well as one of the most selective employers in its industry. Guardsmark claims to only hire 2% of their applicants.