Hagai Tal, chief executive of smartphone advertising specialist Taptica International PLC (LON:TAP), has splashed out more than £140,000 to top up his stake.
Tal bought 36,000 at 398.3p to stake his personal holding to 13.93%.
Taptica recently raised US$30mln in a fundraise alongside a secondary sale of shares by shareholders that included Tal.
Shares were trading up 3% at 415p.