The U.S. Securities and Exchange Commission (SEC) is reportedly investigating First Republic Bank executives for alleged involvement in insider trading. Securities regulators are scrutinizing the bank's executives for using confidential information to trade, the sources said. While the sources did not name any specific individuals under investigation, they claim the SEC is looking into the matter. Additionally, reports indicated that U.S. lawmakers sold shares in the struggling bank before it collapsed and was acquired by JPMorgan.