Large traders are required to register with the SEC in order to be identified by authorities. After registering with the SEC, the identity of the large trader is shared with the Financial Industry Regulatory Authority (FINRA) and the securities exchanges. Large traders must provide information to the SEC and FINRA about their trading activities through reporting and monitoring forms. The information includes details about the ownership of the securities, the amount of trading activity, the broker-dealers used, and other information related to the trades.

The SEC also has the power to investigate the activities of large traders and can impose penalties if they discover any violations of the securities laws. The SEC may also impose the following penalties on large traders: fines, suspensions from trading, revocation of registration privileges, and criminal penalties.

Large traders are an integral part of the securities markets. Their transactions help to provide liquidity to the markets, and their activities can help to reduce volatility. By monitoring the activity of large traders, the SEC is able to ensure that the markets remain fair and orderly. In addition, the SEC is able to monitor fraud, market manipulation, and insider trading activities by large traders.