Goldman Sachs Group Inc. (NYSE: GS) has been an incredible performer among the bulge bracket investment banking firms during the entire credit meltdown and market malaise. Its shares had been holding up better than any of the large cap competitors, partly because of its massive bet against the credit markets and partly because of its other trading efforts outperforming peers. But some evidence is surfacing that a part of this may be peaking or that the firm has lost part of its edge. Today we have seen an SEC filing which may be far more pertinent than an analyst estimate cut and a trader move.