Ritesh Shah has rejoined Goldman Sachs after a brief stint at Primus, the New York-based credit derivative product company. Shah joined Primus in July reportedly to head its correlation desk. Now back at Goldman, he is trading synthetic collateralized debt obligations and reports to Bryan Mix, managing director, said Michael DuVally, spokesman. Shah declined comment and Chris Gerosa, Primus spokesman, did not return a call by press time.