Three Diploma directors have all disposed of a number of performance related shares post-exercise. The shares, which vested at the end of September, were sold at 676p each.Chief Executive Officer Bruce Thompson traded in 110,000, earning £743,600, Chief Operating Officer Iain Henderson sold 30,000, pocketing £202,800, while Nigel Lingwood, Group Finance Director, earned £394,446 from the sale of 58,350. Meanwhile, Alent board member Lars Förberg, who is one of the chemical company's non-executive directors and also a co-founder of major stake holder Cevian Capital, yesterday further increased Cevian's stake in the business with the acquisition of 41,521 shares at 321p each. The £133,282 purchase is in addition to the 4.3m shares acquired earlier in the week. Swedish-born Förberg, who joined Alent's board in October 2012, now has an interest in more than 60m shares in the company, equal to a 21.55% stake, all of which is held by international investment firm Cevian Capital. The purchases saw Förberg take advantage of the decline suffered by Alent's share price in the past couple of months. Earlier this month the group revealed third quarter trading had been "slightly" below its expectations, having said in its half-year results that it expected an improvement in the second half. Top Director BuysSacoil Holdings (DI) (SAC) Director name: Mr Stephanus Hilgard Muller Amount purchased: 1,200,000 @ 1.65p Value: £19,800Alent (ALNT) Director name: Mr Lars FörbergAmount purchased: 41,521 @ 321.00p Value: £133,282HICL Infrastructure Company Ltd (HICL) Director name: Ms Sally Ann (Susie) FarnonAmount purchased: 19,000 @ 131.44p Value: £24,974Tissue Regenix Group (TRX) Director name: Mr John Andrew SamuelAmount purchased: 148,000 @ 13.50p Value: £19,980Throgmorton Trust (THRG) Director name: Ms Jean MattersonAmount purchased: 6,000 @ 293.00p Value: £17,580Top Director SellsDiploma (DPLM) Director name: Mr Bruce ThompsonAmount sold: 110,000 @ 676.00p Value: £743,600Hiscox Ltd (HSX) Director name: Mr Richard WatsonAmount sold: 73,175 @ 662.61p Value: £484,865Diploma (DPLM) Director name: Mr Nigel LingwoodAmount sold: 58,350 @ 676.00p Value: £394,446Hiscox Ltd (HSX) Director name: Mr Richard WatsonAmount sold: 35,974 @ 679.97p Value: £244,612YouGov (YOU) Director name: Mr Alan NewmanAmount sold: 254,167 @ 83.50p Value: £212,229Diploma (DPLM) Director name: Mr Iain HendersonAmount sold: 30,000 @ 676.00p Value: £202,800General Electric Co (GEC) Director name: Mr James I Cash JrAmount sold: 7,000 @ € 20.09 Value: € 140,629Hiscox Ltd (HSX) Director name: Mr Richard WatsonAmount sold: 16,784 @ 667.00p Value: £111,949Redrow (RDW) Director name: Mr Graham CopeAmount sold: 16,093 @ 267.71p Value: £43,083