This Rule 6280 Series governs the reporting by members of transactions in ADF-eligible securities through the ADF.

(a) FINRA may provide a means to permit alternative trading systems ("ATSs"), as such term is defined in Regulation ATS, and electronic communications networks ("ECNs"), as such term is defined in Rule 600(b)(23) of SEC Regulation NMS, to comply with the display requirements of Rule 301(b)(3) of SEC Regulation ATS and the terms of the ECN display alternative provided for in Rule 602(b)(5)(ii)(A) and (B) of SEC Regulation NMS ("ECN display alternatives").

FINRA may, upon notice, terminate ADF Data System service in the event that an ADF Trading Center fails to qualify under specified standards of eligibility or fails to pay promptly for services rendered by FINRA.

FINRA may suspend, condition, limit, prohibit or terminate an ADF Trading Center's authority to enter quotations in one or more ADF-eligible securities for violations of applicable requirements or prohibitions.

A Registered Reporting ADF Market Maker may voluntarily terminate its registration in a security by (1) withdrawing its quotations from the Alternative Display Facility and not re-entering its quotations for five (5) minutes, or (2) failing to re-enter quotations within thirty (30) minutes of the end of a trading halt.

(a) An ADF Trading Center that wishes to withdraw quotations in a security, other than instances when an ADF Trading Center is unable to submit automated quotations to the ADF, shall contact ADF Operations to obtain excused withdrawal status prior to withdrawing its quotations. If an ADF Trading Center cannot submit automated quotations or is unable to immediately and automatically respond to orders, as required by Rule 6250(e), the ADF Trading Center must immediately withdraw its quotations and promptly contact ADF Operations.

(a) A member shall clear and settle transactions effected on the ADF in ADF-eligible securities that are eligible for net settlement through the facilities of a registered clearing agency that uses a continuous net settlement system.

An ADF Trading Center shall be open for business as of 9:30 a.m. Eastern Time and shall close no earlier than 4:00 p.m. Eastern Time. An ADF Trading Center may be open for business on a voluntary basis for any period of time between 8:00 a.m. Eastern Time and 9:30 a.m. Eastern Time or between 4:00 p.m. Eastern Time and 6:30 p.m. Eastern Time. An ADF Trading Center whose quotes are open before 9:30 a.m. Eastern Time or after 4:00 p.m.