A total of 4.36m shares were purchased by seven of HydroDec's board members this week, the oil technology group revealed on Tuesday. The transactions come just a few weeks after the group reported wider losses in the 12 months ended December 31st at $17.45m, compared to $14.20m a year earlier. The largest deal was made by Andrew Black, a non-executive director, who acquired 1.91m shares, taking his stake to 178.05m, equal to an interest of 23.85%. Chief Executive Ian Smale added 454,545, more than doubling his stake to 928,014, while Chief Financial Officer acquired the same amount, taking his holding to 1.35m. The news prompted the value of the shares to jump around 8%. Top Director BuysHydroDec Group (HYR) Director name: Mr Andrew BlackAmount purchased: 1,909,091 @ 11.00p Value: £210,000HydroDec Group (HYR) Director name: Lord Colin MoynihanAmount purchased: 909,090 @ 11.00p Value: £100,000Inmarsat (ISAT) Director name: Dr Abe PeledAmount purchased: 10,000 @ 771.90p Value: £77,190HydroDec Group (HYR) Director name: Mr Ian SmaleAmount purchased: 454,545 @ 11.00p Value: £50,000HydroDec Group (HYR) Director name: Mr Chris Ellis Amount purchased: 454,545 @ 11.00p Value: £50,000HydroDec Group (HYR) Director name: Mr Alan CarruthersAmount purchased: 454,545 @ 11.00p Value: £50,000Stobart Group Ltd. (STOB) Director name: Mr Andrew R WoodAmount purchased: 34,500 @ 144.60p Value: £49,887Severfield (SFR) Director name: Mr John DoddsAmount purchased: 91,000 @ 54.47p Value: £49,568Sinclair Is Pharma (SPH) Director name: Mr Robert SwansonAmount purchased: 50,000 @ 29.75p Value: £14,875Caffyns (CFYN) Director name: Mr Mark HarrisonAmount purchased: 1,874 @ 630.00p Value: £11,806Top Director SellsCranswick (CWK) Director name: Mr Martin DaveyAmount sold: 14,086 @ 1,280.77p Value: £180,409Cranswick (CWK) Director name: Mr Bernard HoggarthAmount sold: 14,086 @ 1,280.77p Value: £180,409Cranswick (CWK) Director name: Mr Adam CouchAmount sold: 5,886 @ 1,280.77p Value: £75,386Cranswick (CWK) Director name: Mr Mark BottomleyAmount sold: 5,082 @ 1,280.77p Value: £65,089Planet Payment Inc. (PPT) Director name: Mr Graham AradAmount sold: 19,814 @ 176.77p Value: £35,025NR