How can you trade CUBE from 4:00am

I was short QQQQ and was trying to cover at 47.04 and some above that price (GTC orders).

My orders were executed at 4:15 am @ 47.18 continued to 4:46 @ 47.04

but how come I can't trade in these hours ... I mean IB only shows the markets as closed ... it's only after 7:30 that one can start trading through IB?
 
Quote from SCI new york:

I believe ARCA opens at 4am. orders do get filled at that time, I've done it before.

Yes both trades were through ARCA ... thanx for the info
 
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