Francisco Soler, non-executive chairman of Tristel, sold £315,680 worth of shares in the disinfectant supplier to satisfy institutional demand following the group's oversubscribed placing. Soler disposed of 769,951 shares in Tristel at 41p each as the group raised £1m to part finance the purchase of a portfolio of infection control products for between £2.15m and £2.4m.The group placed 2.7m shares at 41p each, which will help buy intellectual property and manufacturing rights from Medichem International. The placing was three times over subscribed.Top Director BuysMwana Africa (MWA) Director name: Mr Kalaa MpingaAmount purchased: 1,000,000 @ 5.60p Value: £56,000Castle Asia (CASA) Director name: Mr Christopher RussellAmount purchased: 20,000 @ 92.00p Value: £18,400Top Director SellsTristel (TSTL) Director name: Mr Francisco Angel SolerAmount sold: 366,480 @ 41.00p Value: £150,257Robert Wiseman (RWD) Director name: Mr Martyn MulcahyAmount sold: 33,802 @ 384.10p Value: £129,833Tristel (TSTL) Director name: Mr Francisco Angel SolerAmount sold: 268,980 @ 41.00p Value: £110,282Tristel (TSTL) Director name: Mr Francisco Angel SolerAmount sold: 134,490 @ 41.00p Value: £55,141