 Vanguard Group Inc. raised its position in Luminex Co. NASDAQ:LMNX by 5.7 during the second quarter, HoldingsChannel.com reports. The firm owned 4,707,069 shares of the medical instruments suppliers stock after purchasing an additional 254,134 shares during the period. Vanguard Group Inc. owned approximately 0.10 of Luminex worth 153,121,000 at the end of the most recent ... 