You can use the Complex Orders and Trades scanner which returns all complex combination strategies on a specific underlying that have a native bid/ask quote or that have traded today. To open the Complex Orders and Trades scanner:
- From Mosaic - From the New Window drop down, select Complex Orders and Trades Scanner.
- From Classic TWS - From the Analytical Tools menu, select Complex Orders and Trades Scanner.
To find the strategy that has traded the most today, sort the results by Volume (click on the Volume column to sort).
Find out more about complex orders and trades in the TWS Users' Guide.