Quote from Accountant_23:
You have too much time to do that amount of detective work.

Quote from SWScapital:
FYI, GS had shares to borrow from the open to close on Friday. As much as you wanted. They certainly wouldn't have lent it if it were "illegal to short an IPO in the first 30 days". After all someone has to add liquidity.
I think that restriction has to do with RR`s who work for a firm as a broker or investment advisor and it applies to any sale or purchase of an IPO.

Quote from gunslinger:
As determined by the Securities and Exchange Commission, which is in charge of IPO regulation in the U.S., the underwriters of the IPO are not allowed to lend out shares for short sale for 30 days.
-Thats the rule. Market makers can short, though they may have to buy in, and clients may lend their stock, but that is rare on such a tight deal. I am curious if you actually were able to short the stock, or is this what you heard?
Quote from dgabriel:
http://www.sec.gov/rules/final/34-50103.pdf
No one can short an IPO in the period prior to pricing, for obvious reasons.
But I can find no rule that prohibits shorting an IPO after it commences trading, and I have done it.