Key TakeawaysA report that hedge fund Starboard Value has taken a stake in Starbucks sent shares of the world's biggest coffee chain higher Monday.The Wall Street Journal said it wasn't clear the size of Starboard's investment or what changes it may be calling for.Starbucks already is in settlement negotiations with activist investor Elliott Investment Management, which the paper said has also taken a stake in the company. Starbucks (SBUX) shares advanced in intraday trading Monday on word hedge fund Starbo ...