Let's also examine hedge fund and insider activity in other stocks similar to Opko Health Inc. (NYSE:OPK). These stocks are Sirona Dental Systems, Inc. (NASDAQ: SIRO ), Mine Safety Appliances (NYSE: MSA ), Align Technology, Inc. (NASDAQ: ALGN ), STERIS Corp (NYSE: STE ), and Techne Corporation (NASDAQ: TECH ). This group of stocks are in the medical appliances & equipment industry and their market caps match OPK's market cap.