Tullett Prebon's chief executive Terry Smith has spent more than £1m upping his stake in the interdealer broker.He bought 439,731 shares at 267p a time and now has about 9.2m, which is 4.3% of the firm.He was joined by finance director Paul Mainwaring who took 103,683 shares at 268.9p a time.Top Director BuysTullett Prebon (TLPR) Director name: Mr Terry SmithAmount purchased: 439,731 @ 267.00p Value: £1,174,082Tullett Prebon (TLPR) Director name: Mr Paul MainwaringAmount purchased: 103,683 @ 268.90p Value: £278,804Essentially Group (ESN) Director name: Mr Bart T C CampbellAmount purchased: 1,175,000 @ 6.00p Value: £70,500Beazley Group (BEZ) Director name: Mr Martin BrideAmount purchased: 65,000 @ 93.20p Value: £60,580Essentially Group (ESN) Director name: Mr Matthew VandrauAmount purchased: 781,250 @ 6.00p Value: £46,875Essentially Group (ESN) Director name: Mr Tim BergAmount purchased: 529,801 @ 6.00p Value: £31,788Murray Income Trust (MUT) Director name: Mr Neil HonebonAmount purchased: 5,000 @ 439.00p Value: £21,950Conister Financial Group (CFG) Director name: Mr Simon HullAmount purchased: 170,000 @ 11.80p Value: £20,060Mouchel Group (MCHL) Director name: Mr Ian KnightAmount purchased: 10,000 @ 164.10p Value: £16,410Majedie Investments (MAJE) Director name: Mr Andrew AdcockAmount purchased: 10,000 @ 163.00p Value: £16,300Top Director SellsH.R. Owen (HRO) Director name: Mr Colin GiltrapAmount sold: 781,036 @ 90.00p Value: £702,932Moneysupermarket.com (MONY) Director name: Mr Paul Harris DoughtyAmount sold: 612,018 @ 49.90p Value: £305,397Immunodiagnostic Systems (IDH) Director name: Mr Paul HailesAmount sold: 11,396 @ 307.00p Value: £34,986