Day Trading

Some of the more commonly day-traded financial instruments are stocks, stock options, currencies, and a host of futures contracts such as equity index futures, interest rate futures, and commodity futures.

Day trading used to be the preserve of financial firms and professional investors and speculators. Many day traders are bank or investment firms employees working as specialists in equity investment and fund management. However, day trading has become increasingly popular among casual traders due to advances in technology, changes in legislation, and the popularity of the Internet.

Trade Frequency

Although collectively called day trading, there are many sub-trading styles within day trading. A day trader is not necessarily very active. Depending on one's trading strategy, the number of trades made in a day may vary from a few to hundreds.

Some day traders focus on very short or short-term trading, in which a trade may last seconds to a few minutes. They buy and sell many times in a day, trading very high volumes daily and therefore receiving big discounts from the brokerage.

Some day traders focus only on momentum or trends. They are more patient and wait for a ride on the strong move which may occur on that day. They make far fewer trades than the aforementioned traders.

Overnight Position

Traditionally it is suggested day traders should always settle their positions before the market close of the trading day to avoid the risk of price gaps (differences between the previous day's close and the next day's open price) at the open. Some day traders consider this to be a golden rule to be obeyed at all times. Some day traders, however, believe they should let the profits run, so it is acceptable to stay with a position after the market closes.

Day traders often borrow money to trade. Since margin interests are typically only charged on overnight balances, the extra costs discourage them from holding positions overnight.

Profit and Risks

Because of the nature of financial leverage and the rapid returns that are possible, day trading can be extremely profitable, and high-risk profile traders can generate huge percentage returns. Some day traders manage to earn millions per year solely by day trading.

Because of the high profits (and losses) that day trading makes possible, these traders are sometimes portrayed as "bandits" or "gamblers" by other investors. Some individuals, however, make a consistent living day trading.

Nevertheless day trading can become very risky, especially if one has poor discipline, risk or money management. The common use of buying on margin (using borrowed funds) amplifies gains and losses, such that substantial losses or gains can occur in a very short period of time. In addition, brokers usually allow bigger margins for daytraders. Where overnight margins required to hold a stock position are normally 50% of the stock's value, many brokers allow pattern day trader accounts to use levels as low as 25% for intraday purchases. This means a day trader with the legal minimum $25,000 in his account can buy $100,000 worth of stock during the day, as long as half of those positions are exited before the market close. Because of the high risk of margin use, and of other day trading practices, a day trader will often have to exit a losing position very quickly, in order to prevent a greater, unacceptable loss, or even a disastrous loss, much larger than his original investment, or even larger than his total assets.

Even when a position has made a profit, the trader has to offset the transaction costs and the interest on the margin. It is commonly stated that 80-90% of day traders lose money. An analysis of the Taiwanese stock market suggests that "less than 20% of day traders earn profits net of transaction costs".

Day trading is considered a risky trading style, and regulations require brokerage firms to ask whether the clients understand the risks of day trading and whether they have prior trading experience before entering the market.