A transaction where a gain is guaranteed by the structure of the transaction. To give a very simple example, one may find a client who wishes to purchase a security at $10 per share when one knows that the current price is $9.50 per share. One then buys the security at the current price and instantly re-sells to the client for a 50 cent per share guaranteed profit. This is also called a simultaneous transaction. See also: Arbitrage, Risk-free return.
A dealer transaction in which the dealer makes a purchase or sale to offset a customer order. Thus, if a customer wishes to purchase 500 shares of Rushville Exterminators, Inc., at $80 per share, the dealer may purchase the 500 shares from another source at $79.25 and resell the stock to the customer at a markup of 75¢. The dealer has entered into a riskless transaction because the purchase will be offset by an existing customer order. The markup on riskless transactions is regulated by the National Association of Securities Dealers. Also called simultaneous transaction. See also five-percent rule.