(Undated)  --  Goldman Sachs says it's being investigated for its high frequency trading.  

In a quarterly filing, the banking firm also admitted that its overseas hiring practices are being examined.  High frequency trading is the practice of trading securities at lightning speed with the help of computers.  There are questions about whether high speed trading is good for markets and may offer an unfair advantage to some investors.  

Earlier this week, the "Wall Street Journal" said the SEC was looking into whether Goldman and other banks violated anti-bribery laws by hiring relatives of foreign officials.