The Board has become aware of several issues of municipal securities that prepay principal to the bondholders over the life of the issue. These securities are issued with a face value that equals the total principal amount of the securities. However, as the prepayment of principal to bondholders occurs over time, the "unpaid principal" associated with a given quantity of the securities become an increasingly lower percentage of the face amount. The Board believes that there is a possibility of confusion in transactions involving such securities, since most dealers and customers are accustomed to municipal securities in which the face amount always equals the principal amount that will be paid at maturity.

Because of the somewhat unusual nature of the securities, the Board believes that dealers should be alert to their disclosure responsibilities. For customer transactions, rule G-17 requires that the dealer disclose to its customer, at or prior to the time of trade, all material facts with respect to the proposed transaction. Because the prepayment of principal is a material feature of these securities, dealers must ensure that the customer knows that securities prepay principal. The dealer also must inform the customer of the amount of unpaid principal that will be delivered on the transaction.

For inter-dealer transactions, there is no specific requirement for a dealer to disclose all material facts to another dealer at time of trade. A selling dealer is not generally charged with the responsibility to ensure that the purchasing dealer knows all relevant features of the securities being offered for sale. The selling dealer may rely, at least to a reasonable extent, on the fact that the purchasing dealer is also a professional and will satisfy his need for information prior to entering into a contract for the securities. Nevertheless, it is possible that non-disclosure of an unusual feature such as principal prepayment might constitute an unfair practice and thus become a violation of rule G-17 even in an inter-dealer transaction. This would be especially true if the information about the prepayment feature is not accessible to the market and is intentionally withheld by the selling dealer. Whether or not non-disclosure constitutes an unfair practice in a specific case would depend upon the individual facts of the case. However, to avoid trade disputes and settlement delays in inter-dealer transactions, it generally is in dealers’ interest to reach specific agreement on the existence of any prepayment feature and the amount of unpaid principal that will be delivered.