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.

(a) Unless the context requires otherwise, the terms used in the Rule 6200 and Rule 7100 Series shall have the meanings below.

The Alternative Display Facility ("ADF") is a facility operated by FINRA for members that choose to quote or effect trades in ADF-eligible securities otherwise than on an exchange. The ADF collects and disseminates quotations and trade reports, and compares trades.