Aftermarket The trading activity in a security immediately after its initial ofering to the public; used to defne the volatile time before prices stabilize or the secondary market for upgrades, such as the automotive non-factory parts. Casual investors often wait until the aftermarket has settled down before deciding whether to invest in a specifc stock. or Computer companies can make large sales based solely on the aftermarket when new technology that is desirable but not necessary becomes available. See also: Capital Market, Initial Public Offering (IPO), Investor, Marketing, Security
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