FINRA Rule 6200

What the ADF Is

The Alternative Display Facility is a facility operated by FINRA for members that choose to quote or effect trades in ADF-eligible securities otherwise than on an exchange. As FINRA Rule 6210's operative text directly states — the operative text that describes the ADF itself within the sub-series — the ADF collects and disseminates quotations and trade reports, and compares trades. FINRA members using ADF systems for quotation or trade reporting activities must comply with the Rule 6200 and 7100 Series, as well as all other applicable FINRA rules and the federal securities laws.

The ADF is a display-only facility — it does not provide automated order routing functionality, execution facilities, or linkages between ADF trading centers. ADF trading centers are required by FINRA rule to provide direct electronic access to all other ADF trading centers and to provide such access to all FINRA members that request it, reflecting the Access Rule's equal-access requirements under SEC Regulation NMS. All FINRA members in good standing are eligible to participate in the ADF, pending execution of appropriate contracts and meeting specific requirements as set forth by FINRA. As of the current period, there are no active quoting ADF participants — confirmed on FINRA's ADF information page — meaning the ADF currently operates primarily as a transaction reporting facility rather than as an active quotation display venue.

The ADF's Origins and Purpose

The ADF was established by FINRA (then NASD) in the early 2000s in connection with Nasdaq's transition from an NASD-operated market to an independent national securities exchange registered with the SEC. Prior to this transition, Nasdaq operated as a dealer market under NASD's auspices — NASD operated the quotation system directly. When Nasdaq received SEC approval to operate as an independent exchange, FINRA needed an alternative facility through which market makers and ECNs that chose not to register as exchange participants could continue to display quotations in Nasdaq-listed and other NMS stocks and report their transactions.

The ADF was designed specifically to serve this function — providing a FINRA-operated alternative to exchange quotation and reporting facilities available to any FINRA member choosing to display quotations or report transactions without going through an exchange. The ADF's establishment preserved a FINRA-operated alternative in the market infrastructure, preventing a situation where all NMS stock quotation display and transaction reporting was controlled exclusively by independent exchange operators.

ADF Operating Hours — The Critical 6:30 p.m. ET Session End

One of the most directly exam-tested facts about the ADF is its operating hours, which differ from those of the Trade Reporting Facilities. The ADF operating hours are 8:00 a.m. to 6:30 p.m. Eastern Time for both quotation display and trade reporting. By contrast, the TRFs operate from 8:00 a.m. to 8:00 p.m. Eastern Time each business day. This 90-minute differential between the ADF's 6:30 p.m. ET session end and the TRFs' 8:00 p.m. ET session end is a directly testable distinction on the Series 24 and Series 57.

The practical consequence of this difference: a member that executes an off-exchange NMS stock transaction at, say, 7:15 p.m. ET can report that transaction in real time to a TRF (since the TRFs remain open until 8:00 p.m.), but cannot report it to the ADF in real time — any such transaction must instead be submitted to the ADF on a next-business-day as/of basis by 8:15 a.m. ET.

FINRA Rule 6273 — the Normal Business Hours rule within the 6270 sub-series — establishes that ADF trading centers must be open for business as of 9:30 a.m. Eastern Time and must close no earlier than 4:00 p.m. Eastern Time, with voluntary extended-hours quotation activity permitted between 8:00 a.m. and 9:30 a.m. ET and between 4:00 p.m. and 6:30 p.m. ET. ADF trading centers whose quotes are open during these voluntary extended-hours periods must comply with all FINRA rules applicable to those periods.

FINRA Rule 6282: Transaction Reporting Through the ADF — Timing, Modifiers, and Obligations

FINRA Rule 6282 — Transactions Reported by Members to the ADF — is the operative transaction reporting rule within the FINRA Rule 6270 sub-series and is the most directly exam-relevant operative rule within the entire FINRA Rule 6200 sub-series. Three aspects of FINRA Rule 6282 are particularly significant.

The 10-second reporting requirement during normal market hours. Members shall, as soon as practicable but no later than 10 seconds after execution, transmit to the ADF last sale reports of transactions in ADF-eligible securities executed between 9:30 a.m. and 4:00 p.m. Eastern Time otherwise than on an exchange. Transactions not reported within 10 seconds after execution shall be designated as late. A pattern or practice of late reporting without exceptional circumstances constitutes conduct inconsistent with high standards of commercial honor and just and equitable principles of trade in violation of FINRA Rule 2010. The as soon as practicable standard means members may not deliberately hold reports until the final permissible second — systems must be designed to report promptly, and FINRA will consider the complexity and manual nature of a trade when assessing whether late reporting was justified.

The outside-normal-hours framework and the .T modifier. Transactions executed outside normal market hours — meaning before 9:30 a.m. ET and after 4:00 p.m. ET but within ADF operating hours — must be reported within 10 seconds of execution and shall carry the .T modifier designating execution outside normal market hours. Specifically: transactions executed between 8:00 a.m. and 9:30 a.m. ET and between 4:00 p.m. and 6:30 p.m. ET must be reported within 10 seconds and designated .T. Transactions executed between 6:30 p.m. ET and midnight — after the ADF has closed — must be reported the following business day by 8:15 a.m. Eastern Time, designated as/of and carrying the unique trade report modifier to denote execution outside normal market hours. Reports submitted after 8:15 a.m. on T+1 for such trades are designated as late.

Cancellation and reversal reporting. With the exception of trades cancelled in accordance with the FINRA Rule 11890 Series, members must report cancellations and reversals of ADF-reported trades to the same ADF facility through which the original trade was reported. Cancellations of trades executed between 9:30 a.m. and 4:00 p.m. ET and cancelled at or before 4:00 p.m. must be reported within 10 seconds of the cancellation. Cancellations of trades executed between 9:30 a.m. and 4:00 p.m. ET but cancelled after 4:00 p.m. and before the ADF's 6:30 p.m. session end must be reported before 6:30 p.m. ET.

Timestamp Granularity Requirements

FINRA has amended its reporting rules — effective November 15, 2021 for the ADF and TRFs — to require firms to report time fields in trade reports submitted to FINRA equity trade reporting facilities using the same timestamp granularity that they use when reporting to the Consolidated Audit Trail (CAT). Firms whose systems capture execution time in increments finer than milliseconds — including up to nanoseconds — must report to the ADF in that same finer granularity. Execution time must be expressed in hours, minutes, seconds, and sub-second increments based on Eastern Time in military format. This timestamp consistency requirement ensures that ADF trade report timestamps align precisely with the CAT order lifecycle data, enabling regulators to match reported transactions against the full order event sequence captured in CAT.

The ADF Sub-Series: Child Rules and Their Functions

The complete child rule list confirmed from FINRA.org includes the following within the FINRA Rule 6200 sub-series:

FINRA Rule 6210 — General establishes the foundational description of the ADF and confirms that ADF participants must comply with the Rule 6200 and 7100 Series as well as all applicable FINRA rules and federal securities laws.

FINRA Rule 6220 — Definitions establishes the operative definitions for the ADF sub-series, including: ADF-eligible security; Registered Reporting ADF Market Maker (a FINRA market maker registered in a designated security that displays quotations in the ADF and holds itself out as willing to buy and sell on a regular and continuous basis); Registered Reporting ADF ECN (an ECN that elects to display orders in the ADF); Registered Reporting Member (either category of registered ADF participant); and normal unit of trading (the round lot assigned to a security under SEC Regulation NMS Rule 600(b)).

FINRA Rule 6230 — Use of Alternative Display Facility Data Systems addresses technical infrastructure requirements for ADF participants including connectivity requirements, system specifications, and operational standards for accessing ADF data systems.

FINRA Rule 6240 — Prohibition from Locking or Crossing Quotations in NMS Stocks prohibits ADF participants from displaying quotations that lock or cross protected quotations on other trading venues, implementing Regulation NMS Access Rule requirements.

FINRA Rule 6250 — Quote and Order Access Requirements requires ADF trading centers to provide direct electronic access to all other ADF trading centers and to all requesting FINRA members.

FINRA Rule 6260 — Review of Direct or Indirect Access Complaints establishes the complaint review process for FINRA Rule 6250 compliance disputes.

FINRA Rule 6270 — Quoting and Trading in ADF-Eligible Securities is itself a sub-marker organizing FINRA Rules 6271 through 6282, which address ADF market participant registration, quotation requirements, FINRA Rule 6273's normal business hours framework, short sales in ADF-eligible securities, and FINRA Rule 6282's transaction reporting obligations.

Recordkeeping Obligations for ADF Participants — Three Years, Two-Year Accessibility

ADF participants are subject to SEC Rule 17a-4's broker-dealer recordkeeping requirements, which require that records created in connection with ADF participation — including quotation logs, direct electronic access compliance records under FINRA Rule 6250, trade reports submitted under FINRA Rule 6282, and related supervisory and business communications — be preserved for a minimum of three years, with the first two years maintained in an easily accessible place.

This three-year/two-year accessibility framework is the standard retention schedule under SEC Rule 17a-4 for the category of records that ADF participation generates — including blotter-level records, order and trade data, and compliance documentation. FINRA Rule 4511(c) further requires that all FINRA-required books and records be maintained in a format and media complying with SEC Rule 17a-4. The practical significance for ADF participants is that FINRA examination staff assessing compliance with quotation display, access, and transaction reporting obligations under the Rule 6200 Series will expect firms to produce quotation logs, access provision records, and trade report data on demand throughout the full three-year retention period — with records from the most recent two years immediately accessible without special retrieval procedures.