BRIEF-Merck Global Health Innovation Fund hikes stake in OpGen to 37.5 pct from 11.8 pct By: Reuters: Company News May 27, 2016 at 16:19 PM EDT * Merck Global Health Innovation Fund, Llc reports a stake of 37.5 percent in Opgen Inc as of May 19, 2015 Read More >> Related Stocks: Merck & Co