How does C2 determine fills?

 

We use the bid/ask spread when you place market orders - not the "last" trade price.

Let's look at an example. At the instant you submit an order, it will look like this:

 

Thu Jun 16 09:38:31 2016: B:3.5500, A:3.5600, L:3.6300

 

Notice how the bid/ask was different than the last.

Order is filled at the ask.

 

Note: Orders of seldom traded stocks, futures and options symbols are filled by Ask/Bid prices.

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