Cray Research Inc, Eagan, Minnesota has got its first supercomputer into a Wall Street investment firm: Merrill Lynch & Co has installed a low-end Cray Y-MP2E system at its World Financial Center headquarters in Manhattan, where it will be used for proprietary trading analyses and risk management of existing portfolios. Merrill says that it plans to use the system to price and hedge complex financial instruments faster and more precisely. Terms of the contract have not been disclosed.