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Re:LNKD IPO opens huge at $83 by dj_axl on Thursday May 19, 2011 @01:33PM (#2564707)
During the first 30 days after an IPO, the underwriters are not allowed to lend shares for short sale. Additionally, number of shares are limited. The entire float is not available on the first day of trading. So today, it is probably impossible to short. 30 days from now, it should be available to short.

http://cash.investopedia.com/ask/answers/05/062905.asp

Re:LNKD IPO opens huge at $83 by icedpulleys on Thursday May 19, 2011 @10:16PM (#2566142)
I've heard that larger banks and brokerages (not the underwriters) will start making shares available for shorting as early as Tuesday, which should help ease the share price down.
Re:LNKD IPO opens huge at $83 by spitfire on Thursday May 19, 2011 @06:22PM (#2565581)
put options?
Re:LNKD IPO opens huge at $83 by krishna2 on Friday May 20, 2011 @06:25PM (#2569650)
Options are available for trading only after a certain number of days (generally 60 to 90 days, but in some cases much earlier than that).