Underwriters have a greenshoe option to sell another 8 million shares if demand is high.

如果需求很高，承销商可以选择再出售800万股。

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Underwriters – led by Morgan Stanley, Deutsche Bank and Credit Suisse – have a greenshoe option to sell another 8 million shares if demand is high.

人人IPO的承销商队伍包括摩根士丹利（Morgan Stanley）、德意志银行（Deutsche Bank）和瑞信（Credit Suisse）等投行。 这些承销商拥有一项超额发行权，如果需求很高的话，他们有权额外销售800万股。

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The footnote at the bottom of that second explains what a greenshoe is very well indeed.

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The greenshoe gives bankers the option to sell more shares during the IPO if an offering is oversubscribed.

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This sort of support only lasts for the first few days of the issue: or perhaps only until that greenshoe is exhausted.

FORBES: Explaining Facebook's IPO: The Greenshoe