(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.

A member registered as a Registered Reporting ADF Market Maker shall engage in a course of dealings for its own account to assist in the maintenance, insofar as reasonably practicable, of fair and orderly markets in accordance with this Rule.

(a) A member seeking registration as an ADF Market Participant shall:

(a) For each security in which an ADF Trading Center displays a bid and offer (for Registered Reporting ADF Market Makers), or a bid or offer (for Registered Reporting ADF ECNs), in the ADF, it must:

(a) Definitions. For purposes of these Rules, the following definitions shall apply:

FINRA may at any time authorize the use of Alternative Display Facility data systems on a test basis for whatever studies it considers necessary and appropriate.