Brokers involved in the IPO, including for example Morgan Stanley, Goldman Sachs, J. P. Morgan, Deutsche Bank, Barclays, Credit Suisse, Cowen, Jefferies, RBC, Stifel and UBS, are restricted for 10 days. Don't be surprised to see a few buy ratings at that point.

[ Edit: I said 40 days, but the rule was changed. http://www.finra.org/sites/default/files/notice_doc_file_ref... ]