day trading. The act or practice of buying and selling stock shares or other securities on the same day, esp. over the Internet, usu. for the purpose of making a quick profit on the difference between the buying price and the selling price.
secondary trading. The buying and selling of securities in the market between members of the public, involving neither the issuer nor the underwriter of the securities.
short-term trading. Investment in securities only to hold them long enough to profit from market-price fluctuations. [Cases: Securities Regulation 53.10–53.22. C.J.S. Securities Regulation §§ 142–153.]