The Chief Executive of BHP Billiton, the dual-listed mining titan, has paid off a significant tax obligation resulting from an earlier long-term incentive bonus with the sale of both UK- and Australia-listed shares. Marius Kloppers, who has held the role of CEO since October 2007, has settled the bill by this week selling 59,913 London-listed shares at 1,913p each for a total of around £1.15m, alongside $3.37m-worth of ASX-listed shares. The sales enable Kloppers to satisfy the UK tax requirement for the vesting of 245,000 shares under a 2007 long-term incentive scheme earlier this week. The CEO also acquired 54,831 ordinary shares following the exercise of deferred shares under the 2010 Group Incentive Scheme. Last month the company announced that it was freezing the salaries of its senior management this year "in recognition of the prevailing business climate". BHP was also in the news this week following reports that it is in talks with Petrobras to buy a stake in the Brazilian energy giant's Gulf of Mexico oil fields. Top Director BuysFrontier Mining Ltd (DI) (FML) Director name: Mr George Neville Ralph Cole Amount purchased: 1,500,000 @ 4.30p Value: £64,500Synety Group (SNTY) Director name: Mr Simon CleaverAmount purchased: 25,000 @ 80.00p Value: £20,000Brightside Group (BRT) Director name: Dr Dr Christopher E FayAmount purchased: 65,000 @ 24.00p Value: £15,600GLOBO (GBO) Director name: Mr Dimitrios GryparisAmount purchased: 50,000 @ 24.00p Value: £12,000GLOBO (GBO) Director name: Mr Gerasimos (Makis) BonanosAmount purchased: 50,000 @ 24.00p Value: £12,000Asian Plantation Ltd. (DI) (PALM) Director name: Mr Datuk Amar Leonard Linggi JugahAmount purchased: 5,000 @ 235.00p Value: £11,750Top Director SellsIrish Continental Group Units (ICGC) Director name: Mr Eamonn RothwellAmount sold: 900,291 @ € 18.50 Value: € 16,655,384Entertainment One Ltd. (DI) (ETO) Director name: Mr Robert LantosAmount sold: 1,200,000 @ 157.50p Value: £1,890,000Entertainment One Ltd. (DI) (ETO) Director name: Mr Darren Dennis ThroopAmount sold: 1,100,000 @ 157.50p Value: £1,732,500Entertainment One Ltd. (DI) (ETO) Director name: Mr Patrice TherouxAmount sold: 1,100,000 @ 157.50p Value: £1,732,500Entertainment One Ltd. (DI) (ETO) Director name: Mr Giles Kirkley WillitsAmount sold: 800,000 @ 157.50p Value: £1,260,000Irish Continental Group Units (ICGC) Director name: Mr Gearoid O'DeaAmount sold: 44,782 @ € 18.50 Value: € 828,467Irish Continental Group Units (ICGC) Director name: Mr Anthony (Tony) KellyAmount sold: 9,500 @ € 18.50 Value: € 175,750Irish Continental Group Units (ICGC) Director name: Mr John B McGuckianAmount sold: 2,740 @ € 18.50 Value: € 50,690NR