(Sharecast News) - Indivior chief executive officer Sean Thaxter bought 100,000 shares at 44.64p each on Tuesday, leaving him with an interest of just over 1.6m shares.In addition to Thaxter's £44,640 purchase, two days before non-executive director Daniel Phelan bought 10,000 ADRs, representing 50,000 shares at an average price of $2.78 each, leaving him with an interest in 60,318 Shares, the company said in a statement.Tatjana May, another non-executive director, followed with another 22,309 shares at 44.58p each the next day, leaving her with 22,309 shares.Indivior shares got a boost on the back of the news that the drug developer's directors had been buying up its stock.The company, which makes opioid addiction treatment Suboxone, has been under intense pressure after it was hit with US fraud charges over a marketing scheme used to boost prescriptions of its opioid addiction drugs.At 1620 BST, Indivior shares were up 14.91% at 52p.Top Director BuysJardine Matheson Holdings Ltd (Singapore Reg) (JAR)Director name: Mr E P K WeatherallAmount purchased: 42,885 @ $63.24Value: $2,711,927 Victrex plc (VCT)Director name: Mr Jakob SigurdssonAmount purchased: 3,000 @ 2,091.76pValue: £62,753 Indivior (INDV)Director name: Mr Shaun ThaxterAmount purchased: 100,000 @ 44.64pValue: £44,640 Indivior (INDV)Director name: Mr Daniel J. PhelanAmount purchased: 50,000 @ 42.89pValue: £21,445 Top Director SellsInternational Consolidated Airlines Group SA (CDI) (IAG)Director name: Mr William Matthew WalshAmount sold: 350,000 @ 503.50pValue: £1,762,250 International Consolidated Airlines Group SA (CDI) (IAG)Director name: Mr William Matthew WalshAmount sold: 300,000 @ 504.00pValue: £1,512,000 International Consolidated Airlines Group SA (CDI) (IAG)Director name: Mr William Matthew WalshAmount sold: 300,000 @ 504.00pValue: £1,512,000 James Halstead (JHD)Director name: Mr Mark HalsteadAmount sold: 120,000 @ 508.00pValue: £609,600 International Consolidated Airlines Group SA (CDI) (IAG)Director name: Mr William Matthew WalshAmount sold: 50,000 @ 505.80pValue: £252,900 Arcontech Group (ARC)Director name: Mr Richard LastAmount sold: 100,000 @ 160.12pValue: £160,120 Arcontech Group (ARC)Director name: Mr Richard LastAmount sold: 25,000 @ 161.75pValue: £40,438 Arcontech Group (ARC)Director name: Mr Richard LastAmount sold: 25,000 @ 157.00pValue: £39,250