Goldman Sachs Group Inc. and JPMorgan Chase & Co. were among banks that pledged to improve how they guard client information in Japan amid an insider trading scandal that toppled Nomura Holdings Inc.'s top two executives. Goldman Sachs plans to train employees on ethics from November through February, and last month began programs on maintaining confidentiality, the New York-based bank said in a statement on its website yesterday. JPMorgan plans to increase compliance staff in Japan and boost monitoring of communication between employees to avoid leaks, it said in a statement.