I asked one of the online trading companies this same question on another stock. Their response was as follows:
"...only listed securities can be traded during the pre-market and after hours session, that does not include pink sheet or bulletin board securities.
The reason that the bid/ask will usually have a big spread during the after hours is because the market maker is trying to reduce the number of orders that people put in before the market opens."
Not sure if this is correct or not (or what it evens means), but that was the answer I received.
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