An Executive Director of natural gas giant BG Group has sold 56,034 shares in the company to cover tax and social security liabilities (and associated dealing costs) following the vesting of 103,890 shares earlier this month. Martin Houston sold the shares for 1,269.07p each for a total of £711,111 leaving him with 906,444 shares. The sale was announced on Monday, the same day the company revealed that its Chief Financial Officer (CFO), Fabio Barbosa, is to take a leave of absence after he was diagnosed with a medical condition. BG Group Financial Controller Den Jones will assume of all of Barbosa's responsibilities, acting as interim CFO for what it expected to be the rest of the year. Sir Frank Chapman, BG's Chief Executive Officer, will take over as interim Chairman of the group's Investment Committee. Over the past six months the company's share price has dropped from around the 1,500p mark to its current level of 1,278p, but is up 0.7% in the past year. Top Director BuysTrakm8 Holdings (TRAK) Director name: Mr John Ferris WatkinsAmount purchased: 481,994 @ 17.00p Value: £81,939Plant Impact (PIM) Director name: Mr John BrubakerAmount purchased: 535,000 @ 13.85p Value: £74,098Standard Life Equity Income Trust (SLET) Director name: Mr Richard BurnsAmount purchased: 20,000 @ 287.38p Value: £57,476North Atlantic Smaller Companies Inv Trust (NAS) Director name: Mr Christopher H B MillsAmount purchased: 5,000 @ 1,040.00p Value: £52,000Trakm8 Holdings (TRAK) Director name: Mr James Killingworth HedgesAmount purchased: 299,783 @ 17.00p Value: £50,963Dexion Trading Ltd. (DTL) Director name: Mr Christopher SpencerAmount purchased: 24,900 @ 121.00p Value: £30,129Hansa Trust 'A' Non Voting Shares (HANA) Director name: Mr Alexander Hammond-ChambersAmount purchased: 3,000 @ 706.00p Value: £21,180Tracsis (TRCS) Director name: Mr John Graeme NelsonAmount purchased: 15,287 @ 130.00p Value: £19,873Top Director SellsBG Group (BG.) Director name: Mr Martin HoustonAmount sold: 56,034 @ 1,269.07p Value: £711,111Belvoir Lettings (BLV) Director name: Mr Mike GoddardAmount sold: 600,000 @ 88.50p Value: £531,000Low & Bonar (LWB) Director name: Mr Steve Good Amount sold: 226,026 @ 55.00p Value: £124,314