After Taking Control Of JDate’s Parent Company, Activist Hedge Fund Sets Sights On Rosetta Stone Osmium Partners, which just unseated the CEO and took control of the board of Spark Networks, the parent company of JDate.com and ChristianMingle.com, now holds a 10% stake in Rosetta Stone. Fresh off a major victory with Spark Networks, owner of JDate and Christian Mingle, among other dating sites, the activist hedge fund Osmium ...