Non-executive director Philip Rowley has invested £31,000 in interactive whiteboards supplier Promethean World.Rowley bought 24,838 shares at 124.7p a share, taking his stake to 157,606 shares. Promethean World floated in March 2010 at 200p a share. The share price has been in decline since June. The interim figures in August have sparked a mini-rally in the shares so they have risen from their low of 119p. Promethean World's interims were positive. The Blackburn-based firm said pre-tax profit rose from £2.1m to £9.2m for the six months to June 2010. Revenue increased 35% to £122.4m. The main market is North America but demand for Promethean World's products is increasing in the rest of the world as well. At the moment, 7% of classrooms have interactive whiteboards. Investec set a price target of 222p at the time of the interims. Top Director BuysPromethean World (PRW) Director name: Mr Philip RowleyAmount purchased: 24,838 @ 124.70p Value: £30,973Aer Lingus Group (AERL) Director name: Mr Andrew MacfarlaneAmount purchased: 25,000 @ € 0.92 Value: € 23,000Bioquell (BQE) Director name: Mr Simon ConstantineAmount purchased: 14,000 @ 115.00p Value: £16,100Rank Group (RNK) Director name: Mr Peter W JohnsonAmount purchased: 8,926 @ 113.37p Value: £10,119Top Director SellsPennon Group (PNN) Director name: Mr Christopher LoughlinAmount sold: 19,023 @ 570.37p Value: £108,501Pennon Group (PNN) Director name: Mr C I J H DrummondAmount sold: 16,684 @ 570.37p Value: £95,161Pennon Group (PNN) Director name: Mr D J DupontAmount sold: 16,684 @ 570.37p Value: £95,161Pennon Group (PNN) Director name: Mr Ken WoodierAmount sold: 9,510 @ 570.37p Value: £54,242