Quote from Options12:
To softdown, IB's statement on this is debatable.
For a quick review check out:
http://bannronn.com/market-basics/us-brokers/trade-execution-order-routing-options.html
Where the author writes:
"Internalization Using SMART Routing Technology
The third option is internalization in which the broker can send the order to a different division within the firm to fill the order. An excellent example of this is the relationship between Interactive Brokers (IB) and Timber Hill (TMBR). TMBR makes markets in a variety of trading instruments while IB is a deep discount brokerage in stocks, futures, options etc. Using IB's SMART routing technology, orders are routinely routed to TMBR to see if it can be executed there before proceeding elsewhere."
So it seems that IB is in the whole subpenny game afterall?