The chief executive of surveying, valuation and rent review group Christie, David Rugg, has upped his stake in the company, spending £60,000 on shares.He took 100,000 at 60p a time and now has about 2.6m or 10.3% of the company.Christie works with the retail, leisure and care sectors and has offices across Britain, mainland Europe as well as one in Toronto and one in Dubai.Top Director BuysRentokil Initial (RTO) Director name: Mr Jeremy TownsendAmount purchased: 113,273 @ 73.55p Value: £83,312Christie Group (CTG) Director name: Mr David RuggAmount purchased: 100,000 @ 60.00p Value: £60,000Rentokil Initial (RTO) Director name: Mr Jeremy TownsendAmount purchased: 58,902 @ 73.55p Value: £43,322Brooks Macdonald Group (BRK) Director name: Ms Diane Seymour-WilliamsAmount purchased: 2,000 @ 1,247.00p Value: £24,940Panmure Gordon & Co (PMR) Director name: Mr Edmond WarnerAmount purchased: 100,000 @ 15.00p Value: £15,000