Trading ES: What is different between Broker Directory list and CME ClearPort Brokers

GetLost

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Dear All,
I was searching on CME's web site to find a trustable broker.
But I got confused a little bit. What is different between Broker Directory list and CME ClearPort Brokers on Broker Directory
A friend of mine told me that some broker companies don't send your orders to market and mach them in house. Is that true?
 
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