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What does investment bank risk during IPO?
There are two kinds of engagements in an IPO. The traditional kind where the Banks assume the risks of unsold shares. Money coming out of their pockets to hold shares no one wants. That is the main risk. No one buying the stock that the bank is holding.  Secondly, there is a "best efforts" engagement. This means that bank will put forth its best effort to sell the shares, but will not be on the hook if any don't sell. This is used for small cap / risky companies.  Source: Author/investment banker