Quote from Maverick74:
Shan, when you get some time, read through this entire thread. I basically wrote a book on tape reading.
http://www.elitetrader.com/vb/showthread.php?s=&threadid=56373&highlight=short+selling+chat
Ok will do. Here's the link where the trader with the tape reading service mentions the pricing discrepancy. I guess one could take it to mean that there was little pre market action? Don't know if that would make a difference.