In a market making strategy, signals can be generated by extracting information from the order book and real time transactions. One common signal in this type of strategy is the tick imbalance bar that has the goal of detecting how informed traders are playing in the market. The imbalance bar is produced when there is an imbalance between bid and ask ticks that exceed an expectation.
These strategies are based on high frequency data and demand high storage requirements, execution optimization and quantitative models to grasp market regime. Generally, algorithms designed for these strategies are fed with tick level transaction data and a real time copy of the order book of the exchange.
Day Trading Strategies or Intraday Momentum
A big advantage of day trading strategies, when compared to strategies with longer time periods, is that they do not suffer big drawdowns such as those occurring during a financial crisis event. They also have higher Sharpe ratios compared to inter-day momentum strategies. These strategies try to gain profits from short-term opportunities during the day.
A well-know day trading strategy is the Opening Gap Strategy. This setup is originated when a stock or an ETF starts the new trading session with an open price having a big gap compared to the previous market close. The gap can be in either direction.
Trading strategies can be automated in order to find stocks and ETFs that have great gaps between the previous close and current open and define entry points based on the price action within one hour after the markets open. Exit rules can also be defined by the algorithm.
In case the gap has bullish direction, and the price makes a new high after the up-gap, the stop loss can be placed at the close level of the previous day.
Other great sources for day trading strategies are news sentiments. Market news are momentum drivers which can extend along the whole trading session. An Earning Announcement and other corporate events will move stock prices, and this movement would persist for some time after the announcement. Many trading strategies have developed around Earnings Announcement in order to profit from stocks moves. This kind of strategy is called the Post Earnings Announcement Drift (PEAD). For an implementation and backtesting of this strategy, it is necessary to get the dates of the Earning Announcement and define rules to enter and exit the position.
Day traders also use scalping strategies to make profits from the market. These strategies run over the shortest time frames such as one and five minutes. A scalping strategy can be built around overbought and oversold signals generated by technical indicators such as the Relative Strength Index (RSI) and the Stochastic.
