One of the primary functions of broker-dealers is to act as intermediaries for investors that are buying or selling stock. Often, to carry out that function, broker-dealers will handle such investor orders on a riskless principal basis. A riskless sale is one in which a broker-dealer, after having received an order to sell a security, sells the security as principal, at the same price, to satisfy that order. Regulations require broker-dealers to mark their proprietary riskless sell order as short if they don't own the security, even if the customer order to sell the security is long. Since broker-dealers generally don’t maintain a position, a significant number of such riskless sales are reported as short, even though the customer is selling long, and the broker-dealer intends to and will buy the shares from the long selling customer immediately after the proprietary riskless short sale takes place.
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