Korea’s SD Biosensor, SJL Partners To Buy U.S. Covid-19 Test Maker In $1.5 Billion Deal South Korean billionaire Cho Young-sik’s SD Biosensor and Seoul-based private equity firm SJL Partners said they are acquiring Nasdaq-listed diagnostics company Meridian Bioscience for $1.53 billion in cash, paving the way for SD Biosensor’s entry into the huge U.S. market.