Goldman Sachs Group Inc. investor James Mercer, in a lawsuit against former board member Rajat Gupta in which the bank is a "nominal plaintiff," filed court papers opposing a motion by the defendant to dismiss the case. In the lawsuit, Mercer alleged Gupta disclosed confidential bank information to Galleon Group LLC co-founder Raj Rajaratnam, the hedge-fund manager who was later convicted of insider trading. Gupta has been charged by federal prosecutors in connection with the Rajaratnam probe.