 A U.S. judge on Thursday said institutional investors, including BlackRock Inc and Allianz SEs Pacific Investment Management Co, can pursue much of their lawsuit accusing 15 major banks of rigging prices in the 6.6 trillion-a-day foreign exchange market. U.S. District Judge Lorna Schofield in Manhattan said the nearly 1,300 plaintiffs, including many mutual funds and exchange-traded funds, plausibly alleged that the banks conspired to rig currency benchmarks from 2003 to 2013 and profit at their expense. This is an injury of the type the antitrust laws were intended to prevent, Schofield wrote in a 40-page decision. 