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The aftermarket (also called secondary market) is the financial market for trading of already issued securities. In the secondary market, securities are sold by and transferred from one investor to another. It is therefore important that the secondary market be highly liquid and transparent. The eligibility of stocks and bonds for trading in the secondary market is regulated through financial supervisory authorities and the rules of the market place in question, which could be a stock exchange.
Stock brokers see the secondary market as the retail part of their business. They are dealing with many clients and many relatively small transactions. This can be contrasted with the primary market in initial public offerings which can be seen as the wholesale side of their business.
The term aftermarket can also refer to the addition of non-factory parts, accessories and upgrades to a motor vehicle. See. Aftermarket (automotive).