Rentokil strengthened its foothold in the US residential pest control market in 2006, when it acquired the Reading, Pennsylvania-based J.C. Ehrlich Co, Inc., the fourth-largest and largest privately held pest control company in the US. In the following year Rentokil sold the Initial Fire, Electronic Security and manned guarding businesses, previously known as Shorrock, to United Technologies Corporation. However, in 2010, Rentokil Initial acquired Knightsbridge Guarding Ltd and Perception LLP to re-enter the manned security/reception staffing business, to complement the existing cleaning, washroom, Ambius and pest control businesses.