Match Group is the parent company of Tinder, Hinge and other dating platforms. Photo: Nikolas Kokovlis/Zuma PressElliott Investment Management has built a big stake in Match Group and plans to push the online dating company to take steps to boost its languishing stock. The activist has built a position of roughly $1 billion in Match, the parent company of Tinder, Hinge and other dating platforms, according to people familiar with the matter.  ...