Can you please give a link? I can't find any. Here they say it is possible, only the underwriters of the IPO are not allowed to lend out shares for short sale for 30 days. http://www.investopedia.com/ask/answers/05/062905.asp
JB = "Jailed Brokers" but i take my little joke back now reading from the knowledgeable people that IPO can in fact be shorted.