When not in contravention of such rules and regulations as the Commission may prescribe as necessary or appropriate in the public interest and for the protection of investors, to maintain fair and orderly markets, or to remove impediments to and perfect the mechanism of a national market system, the rules of a national securities exchange may permit (1) a member to be registered as an odd-lot dealer and as such to buy and sell for his own account so far as may be reasonably necessary to carry on such odd-lot transactions, and (2) a member to be registered as a specialist. Under the rules and regulations of the Commission a specialist may be permitted to act as a broker and dealer or limited to acting as a broker or dealer. It shall be unlawful for a specialist or an official of the exchange to disclose information in regard to orders placed with such specialist which is not available to all members of the exchange, to any person other than an official of the exchange, a representative of the Commission, or a specialist who may be acting for such specialist: Provided, however, That the Commission, by rule, may require disclosure to all members of the exchange of all orders placed with specialists, under such rules and regulations as the Commission may prescribe as necessary or appropriate in the public interest or for the protection of investors. It shall also be unlawful for a specialist permitted to act as a broker and dealer to effect on the exchange as broker any transaction except upon a market or limited price order.
If because of the limited volume of transactions effected on an exchange, it is in the opinion of the Commission impracticable and not necessary or appropriate in the public interest or for the protection of investors to apply any of the foregoing provisions of this section or the rules and regulations thereunder, the Commission shall have power, upon application of the exchange and on a showing that the rules of such exchange are otherwise adequate for the protection of investors, to exempt such exchange and its members from any such provision or rules and regulations.
It shall be unlawful for a member of a national securitiesexchange who is both a dealer and a broker, or for any person who both as a broker and a dealer transacts a business in securities through the medium of a member or otherwise, to effect through the use of any facility of a national securities exchange or of the mails or of any means or instrumentality of interstate commerce, or otherwise in the case of a member, (1) any transaction in connection with which, directly or indirectly, he extends or maintains or arranges for the extension or maintenance of credit to or for a customer on any security (other than an exempted security) which was a part of a new issue in the distribution of which he participated as a member of a selling syndicate or group within thirty days prior to such transaction: Provided, That credit shall not be deemed extended by reason of a bona fide delayed delivery of (i) any such security against full payment of the entire purchase price thereof upon such delivery within thirty-five days after such purchase or (ii) any mortgage related security or any small business related security against full payment of the entire purchase price thereof upon such delivery within one hundred and eighty days after such purchase, or within such shorter period as the Commission may prescribe by rule or regulation, or (2) any transaction with respect to any security (other than an exempted security) unless, if the transaction is with a customer, he discloses to such customer in writing at or before the completion of the transaction whether he is acting as a dealer for his own account, as a broker for such customer, or as a broker for some other person.