6250. Quote and Order Access Requirements

(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:
(1) Provide other ADF Trading Centers direct electronic access, as defined below;
(2) Provide registered broker-dealers that are not ADF Trading Centers direct electronic access and allow for indirect electronic access, as defined below.

6240. Prohibition from Locking or Crossing Quotations in NMS Stocks

(a) Definitions. For purposes of these Rules, the following definitions shall apply:
(1) The terms "automated quotation," "National Market System Plan" (NMS Plan), "intermarket sweep order," "manual quotation," "NMS stock," "protected quotation," and "trading center" shall have the meanings set forth in Rule 600(b) of SEC Regulation NMS.
(2) The term crossing quotation shall mean the display of a bid for an NMS stock at any time between 8:00 a.m. and 6:30 p.m.

6210. General

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.
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