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Financial Trading System Development In Excel: How To Do It Right

By Arthur Juneau


Are you interested in a financial trading system for yourself or your investment business? There are many starting points. There are several important considerations to ensure it gets done right and you arrive at a strong system.

One of the main challenges when buying or building a financial trading system is the sheer number of choices. Trading software ranges from cheap "every man" applications and shareware to full-blooded enterprise systems designed for the largest banks and hedge funds. So the first question is "where do I fit in the range of size and sophistication?" This helps define the features you need, the money you will spend, and the vendors you will buy from...or build if you like that path.

A smaller firm of 10 traders implementing different strategies doesn't require an elaborate financial trading system designed for a big i-bank. However, your traders are probably sophisticated enough to need real feature -- trading millions in stocks, futures and forex on a daily basis requires the ability to create and manage multiple strategies easily. A firm this size needs something configurable, componentized, transparent and flexible.

The main parts of a financial trading system are the trading strategy builder, watch lists, execution methods, price-volume data module, position tracker, P&L reporting and risk analytics. Depending on your needs, two more components to consider are accounting and an OMS. The boundary between your trading, accounting and order management systems is up to you. You can rely on your broker for much of this.

From a trading strategy and analysis standpoint, Microsoft Excel tends to be one of the top 2 or 3 applications. You can easily program trading strategies directly in Excel with formulas, VBA, and manual user controls such as dropdowns, data entry cells, and macro buttons. A trader can quickly pull in market data (prices, volume, PE ratios, etc.) and combine it with technical and fundamental indicators with simple if-then statements and Excel's native calculation engine. Elaborate pre- and post-trade analysis can be done along with charting and trend analysis in Excel. That's why it's so widely used by Wall Street and City of London traders who have the best desktop trading systems in the world at their disposal.

Small trading shops and invidual traders can execute trades directly in the market by integrating with your broker's execution API. If your firm has an OMS with an API, trade signals originated in Excel can be routed through the OMS and executed at different prime brokers or liquidity centers. Different order types, VWAP and contingent orders can be implemented to ensure best execution.

Building a financial trading system in Excel involves strategy definition, data management, position sizing, P&L reporting, backtesting and a variety of other processes. You can build or integrate third-party components for these functions. Excel can also be used for basic back office trade processing, though there are dedicated systems available which are better at this. Real time market executions require special infrastructure to handle large volumes and low-latency speed -- Excel is less suited to this than software coded in C# or java.

As you can see, there are lots of considerations in the trading technology area. Hopefully this helps you put together the best financial trading system for you.




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