It is the Wall Street equivalent of a perfect game of baseball - 27 up, 27 down, the final score measured in millions of dollars a day. Despite the running unease in world markets, four giants of American finance managed to make money from trading every single day during the first three months of the year. Their remarkable 61-day streak is one for the record books. Perfect trading quarters on Wall Street are about as rare as perfect games in Major League Baseball. But Bank of America, Citigroup, Goldman Sachs and JPMorgan Chase & Company produced the equivalent of four perfect games during the first quarter. Each one finished the period without losing money for even one day. Their showing ... underscored the outsize - and controversial - role that trading has assumed at major financial institutions. It also drives home the widening lead that a handful of big banks are enjoying over lesser rivals on post-bailout Wall Street. The four banks ... reaped big rewards without necessarily placing big bets that stocks or bonds would go up or down. This is not about hitting home runs," said Jaidev Iyer, who runs his own risk management consulting firm, J-Risk Advisors. "This is just, as we call it, milking the market and your captive client base."