Margaret Langlands, the wife of John Langlands, chief executive at British Polythene Industries, on Thursday sold 35,000 shares at a price of 615p each.Langlads, who's husband has been in the company for twenty years, pocked £215,250 with the transaction and was left holding 283,683 shares in the group. That equates to 1.04% of the company's shareholders' equity.The manufacturing company said last month a decline in polymer prices and volumes in line with 2013 during the third quarter of the year helped its full-year performance to remain in line with market expectations.Top Director BuysIronveld (IRON) Director name: Mr Charles Giles ClarkeAmount purchased: 150,000 @ 7.00p Value: £10,500Ironveld (IRON) Director name: Mr John Nicholas HarrisonAmount purchased: 150,000 @ 7.00p Value: £10,500Top Director SellsBritish Polythene Industries (BPI) Director name: Mr John T LanglandsAmount sold: 35,000 @ 615.00p Value: £215,250BATM Advanced Communications Ltd. (BVC) Director name: Mr Peter SheldonAmount sold: 600,000 @ 15.38p Value: £92,280