** Shares in Keurig Dr Pepper KDP.O up 2.4% at $26.45
** Activist investor Starboard has built a stake in the beverage group, FT reports
** Starboard started taking a stake in KDP starting August, when it said it would buy European coffeemaker JDE Peet JDEP.AS for about $18 bln - FT
** Including session's move, KDP down ~20% so far this year