Matt Levine through the deal maker did lovely story of Facebook IPO on Nasdaq . The First few pages are worth a read . imagesHere are the details from SEC account

In a typical IPO on NASDAQ, shares of the issuer are sold by the IPO’s underwriters to participating purchasers at approximately midnight and secondary market trading begins later that morning. Secondary trading begins after a designated period – called the ‘Display Only Period’ or ‘DOP’ – during which members can specify the price and quantity of shares that they are willing to buy or sell (along with various other order characteristics), and can also cancel and/or replace previous orders. The DOP usually lasts 15 minutes… Continue reading

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