Stuart Paterson, a non-executive director at Devro has beefed up his holding in the sausage skin manufacturer, soon after the company issued a bullish trading update.He bought 20,000 shares at 91.8p a time, and now has 50,000.Last week Devro said that it has performed in line with expectations since January and that it anticipates another year of progress.Its shares are up by about 11% on the year, an impressive performance in current markets.Paterson, who is chief financial officer at the local newspaper group Johnston Press, joined Devro in 2006.Top Director BuysDevro (DVO) Director name: Mr Stuart R PatersonAmount purchased: 20,000 @ 91.80p Value: £18,360Premier Renewable Energy Fund Ltd. (PRF) Director name: Mr David StaplesAmount purchased: 27,000 @ 55.00p Value: £14,850Top Director SellsCompass Group (CPG) Director name: Mr Gary GreenAmount sold: 467,925 @ 358.40p Value: £1,677,043Tesco (TSCO) Director name: Mr Philip A ClarkeAmount sold: 332,984 @ 350.90p Value: £1,168,441Capita Group (CPI) Director name: Mr Kevin DadyAmount sold: 2,119 @ 677.50p Value: £14,356Dairy Farm International (Singapore) (DFI) Director name: Mr Michael KokAmount sold: 2,700 @ $5.20 Value: $14,040