(ShareCast News) - A number of Tristel's directors have snapped up extra shares just days after the AIM-listed company said it is lifting its dividend.Chairman Francisco Soler bought 61,200 shares over £60,000, while director Paul Barnes purchased 30,000 for just over £31,000.It takes their total take to 25.3% and 1.7% respectively.Meanwhile, chief executive Paul Swinney and finance director Liz Dixon bought 5,000 shares each.The group, which produces infection control and hygiene products, hiked its interim dividend by 95% to 1.14p on Wednesday.For the six months ended 31 December, pre-tax profit was up 36% from 2014 to £1.5m on revenue of £8m, up 8%.Top Director BuysTristel (TSTL)Director name: Soler,Francisco AngelAmount purchased: 61,200 @ 98.90pValue: £60,526.80Minds + Machines Group Limited (di) (MMX)Director name: Elliott,GuyAmount purchased: 620,000 @ 9.00pValue: £55,800.00Tristel (TSTL)Director name: Barnes,Paul MartinAmount purchased: 30,000 @ 103.90pValue: £31,170.00Galliford Try (GFRD)Director name: Macpherson,Ishbel Jean StewartAmount purchased: 2,125 @ 1,412.00pValue: £30,005.00Minds + Machines Group Limited (di) (MMX)Director name: Salazar ,Michael Amount purchased: 245,000 @ 9.00pValue: £22,050.00Ddd Group (DDD)Director name: Arisawa,SanjiAmount purchased: 400,000 @ 2.50pValue: £10,000.00Jpmorgan Emerging Markets Inv Trust (JMG)Director name: Kaletsky,AnatoleAmount purchased: 1,910 @ 521.00pValue: £9,951.10Volex (VLX)Director name: Morris,Daren Amount purchased: 20,000 @ 41.90pValue: £8,380.00Tristel (TSTL)Director name: Dixon ,Elizabeth Amount purchased: 5,000 @ 96.00pValue: £4,800.00Tristel (TSTL)Director name: Swinney,Paul ChristopherAmount purchased: 5,000 @ 94.00pValue: £4,700.00Witan Inv Trust (WTAN)Director name: Claydon,CatherineAmount purchased: 1 @ 712.35pValue: £7.12Top Director Sells