(AFX UK Focus) 2010-02-03 23:03 Nasdaq OMX aims to launch third U.S. venue in May
NEW YORK, Feb 3 (Reuters) - Nasdaq OMX plans to launch its third U.S. stock-trading platform, called NASDAQ OMX PSX, or simply PSX, in May, the exchange operator said in a note to traders on Wednesday. Newly-named PSX will use a “price-size priority pro-rata” structure in which standing buy and sell orders are matched proportionally according to their size, irrespective of when they arrived at
