There is GREAT danger and misinformation with respect to charting spread expressions synthetically ( a charted spread expression where each leg is written as the individual month/year code or individual flat price product code ) unless all of the instruments trade at simultaneous frequencies and without co integration lags. In other words, parallel liquidity amongst instruments is mandatory within seconds or you are charting a MIRAGE.
As Bone stated above, charting a synthetic spread created from the underlying legs is not as simple as comparing the last traded price of one leg to the others or using one-minute bar data to compute the spread prices. To prevent from “charting a mirage” as Bone stated, here at
Trading Technologies (TT) we have gone out of our way to provide a better spread chart. We capture all best bid-ask market moves and traded prices, such that we look at one leg’s best bid or ask price when a trade occurs on the other leg’s bid or ask.
The above method creates an excellent synthetic spread chart and we support up to 10-leg spreads. The nice thing about TT, is once you create the spread for trading, there is no additional work to create the spread chart. You can request the synthetic instrument and add studies and drawing tools just like a regular instrument in the chart.
Our bid-to-bid/ask-to-ask spread charts will calculate a spread price whenever there is a trade on one leg. If the trade occurs on the bid of leg one, then we will look at the bid of the other legs if they are required to sell and the ask if they are required to buy to determine the spread price. This effectively acts as getting edge on one leg with a limit fill and the other legs going to market to complete the spread.
Below are some screenshots showing the difference between using exchange traded spreads and synthetic spread charts. One thing that stands out is as long as there is one leg in your spread that has liquidity, the synthetic chart will have more data and be able to provide the trader with more information as to how the spread moves. (Some exchange traded spreads have so little liquidity that a move can occur, but if no trade occurs the movement is not displayed in a chart of the exchange traded spread.)
Below is a screenshot of a comparison chart between a synthetic spread and an exchange traded spread. We are currently working on adding comparison charts in the next-gen TT platform over the next two months. (TT is not only the acronym for Trading Technologies, it is also the name of our new platform.) Soon we will take spread charts even further by allowing for additional spread chart options like charting mid-to-mid prices of the spread.