The Chief Financial Officer (CFO) of Domino's Pizza more than halved his stake in the FTSE 250 pizza delivery chain on the same day the firm disappointed the market with its interim results.Lee Ginsberg, a chartered accountant who joined the firm back in 2004, sold a total of 70,000 shares on Tuesday at an average price of 578p each for a total of £404,600. The CFO, who is also a Non-Executive Director at retailer Mothercare, was left with 49,800 shares in Domino's after the transaction, representing a stake of 0.03%.The stock slumped by 5.75% to 565.5p by Tuesday's close despite the firm reporting in-line figures for its first half - as investors focused on news of its expansion plans overseas.The company was forced to push back its breakeven target for its German business from 2015 to 2016-2017 saying that its development in this market will be a "longer and steeper road than originally predicted".Top Director BuysWolseley (WOS) Director name: Mr Gareth DavisAmount purchased: 3,250 @ 3,150.00p Value: £102,375Wincanton (WIN) Director name: Mr David RadcliffeAmount purchased: 25,000 @ 74.12p Value: £18,530Top Director SellsBT Group (BT.A) Director name: Mr Ian LivingstonAmount sold: 537,846 @ 336.00p Value: £1,807,163BT Group (BT.A) Director name: Mr Ian LivingstonAmount sold: 478,762 @ 336.00p Value: £1,608,640Hogg Robinson Group (HRG) Director name: Mr Kevin RufflesAmount sold: 1,689,251 @ 70.06p Value: £1,183,489Hogg Robinson Group (HRG) Director name: Mr David RadcliffeAmount sold: 1,012,499 @ 70.06p Value: £709,357Bodycote (BOY) Director name: Mr Stephen C HarrisAmount sold: 82,942 @ 600.00p Value: £497,652BT Group (BT.A) Director name: Mr Gavin PattersonAmount sold: 144,997 @ 336.00p Value: £487,190BT Group (BT.A) Director name: Mr Tony ChanmugamAmount sold: 137,747 @ 336.00p Value: £462,830Domino's Pizza Group (DOM) Director name: Mr Lee D GinsbergAmount sold: 70,000 @ 578.00p Value: £404,600Ocado Group (OCDO) Director name: Mr Mark RichardsonAmount sold: 96,850 @ 320.64p Value: £310,540BT Group (BT.A) Director name: Mr Tony ChanmugamAmount sold: 65,130 @ 336.00p Value: £218,837BC