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A new issue in which investors show a lack of interest. Before a new issue, underwriters canvass potential investors, who may or may not book an order to buy a portion of the new issue. The portion that is not booked is called the unsubscribed portion. The existence of an unsubscribed portion may affect the price when the security is actually issued. Sometimes an issuer requires underwriters to buy the unsubscribed portion in order to raise its target capital. See also: Underbooked, Fully subscribed.