(Sharecast News) - System1 founder and chief executive John Kearon sold 358,974 ordinary shares in the AIM-listed marketing research and advertising company.Kearon, who launched System1's predecessor BrainJuicer back in 2001, disposed of the shares at an average price of 195p, for a total value of £699,999.32.System1's CEO now holds 2.96m shares in the group, representing 23.6% of the company's voting share capital.Analysts at Canaccord Genuity left their forecasts for System1 unchanged earlier this month following the release of the firm's interim results.With System1 trading in line with its recent trading update, and with profit expectations well underpinned by tight cost control, along with investment in more scalable and lower cost products and services, the Canadian broker reiterated its 'buy' rating and 400p price target.Canaccord said System1 revenues were set to "stabilise" in its next financial year, noting that it should then return to growth in 2020 as it responds to the redesign of its product offerings.As of 1640 GMT, System1 shares had soared 20% to 234p.Top Director BuysRobert Walters (RWA)Director name: Walters,Robert CAmount purchased: 13,535 @ 559.00pValue: £75,660.65Vertu Motors (VTU)Director name: Lever,KenAmount purchased: 60,000 @ 38.15pValue: £22,890.00Georgian Mining Corporation Npv (di) (GEO)Director name: Struthers,Michael Amount purchased: 350,000 @ 6.50pValue: £22,750.00Georgian Mining Corporation Npv (di) (GEO)Director name: Kuenzel ACA,GregoryAmount purchased: 250,000 @ 6.50pValue: £16,250.00Georgian Mining Corporation Npv (di) (GEO)Director name: O'Brien,NeilAmount purchased: 250,000 @ 6.50pValue: £16,250.00Georgian Mining Corporation Npv (di) (GEO)Director name: Damouni,PeterAmount purchased: 220,000 @ 6.50pValue: £14,300.00Howden Joinery Group (HWDN)Director name: Caddick,KarenAmount purchased: 3,000 @ 462.02pValue: £13,860.45Georgian Mining Corporation Npv (di) (GEO)Director name: (Laurie) Mutch,Laurence Amount purchased: 150,000 @ 6.50pValue: £9,750.00Touchstone Exploration Inc Npv (di) (TXP)Director name: Smith,Stanley Amount purchased: 40,000 @ $0.25Value: $7,991.70Horizonte Minerals (HZM)Director name: Fisher,WilliamAmount purchased: 100,000 @ $0.04Value: $2,460.93Jpmorgan Asian Investment Trust (JAI)Director name: Gould,RonaldAmount purchased: 38 @ 331.00pValue: £125.78Top Director SellsSystem1 Group (SYS1)Director name: Kearon,JohnAmount sold: 358,974 @ 195.00pValue: £699,999.32