Where does FINRA Rule 6100 sit relative to its neighbours in the 6000 series?

After the trade reporting facility rules, which supply the machinery its child rules rely on

After the top-level 6000 marker and before FINRA Rule 6110, the first substantive child rule

At the end of the series, gathering the rules that the earlier sub-series leave unaddressed

Alongside the TRACE rules, both dealing with reporting obligations outside the exchanges

What makes an equity security an NMS stock?

That it is admitted to trading on more than one registered national securities exchange at once

That its issuer meets the continued listing standards of the exchange on which it is listed

That transaction reports in it are collected and disseminated under an effective transaction reporting plan

That it trades above the minimum price at which sub-penny quotation is permitted

Among the Regulation NMS rules that apply to NMS stocks, what does the Sub-Penny Rule govern?

The increments in which stocks priced at or above one dollar may be quoted

The fees a venue may charge for access to the quotations it displays publicly

The minimum size a market participant must display when it publishes a quotation

The share of a day's volume that may be executed away from a listing exchange

Which activity in NMS stocks does FINRA Rule 6100's sub-series address?

Member firm activity in securities that have been removed from exchange listing but still trade

Member firm activity on the exchanges, the off-exchange dimension being left to the venues themselves

All member firm activity in those securities, whether executed on an exchange or away from one

Off-exchange trading in NMS stocks is commonly described as over-the-counter trading. What does that phrase mean here?

That the securities are unlisted and trade only through dealer quotation systems

That the trades are negotiated bilaterally rather than executed against a displayed quotation

That exchange-listed securities are being traded away from the exchanges, the securities remaining listed

That the trades are reported after the close rather than during the continuous trading session

The child rules of FINRA Rule 6100's sub-series fall into three functional groups. What are they?

Exchange trading, off-exchange trading, and the reporting of both to a consolidated feed

Registration, supervision, and the disciplinary consequences of failing at either of them

Equity securities, debt securities, and the facilities through which each of them is reported

Trading practices, information and quotation obligations, and transaction reporting

What purpose do Market Participant Identifiers serve in the off-exchange framework?

They identify the member submitting trade reports and quotations to FINRA's facilities

They identify the customer on whose behalf an off-exchange transaction was executed

They identify which registered national securities exchange listed the security being traded

They identify the clearing member that will settle the transaction once it has been reported

The sub-series carries two separate trading halt rules. What distinguishes them?

One applies to listed securities and the other to securities quoted away from any exchange

One covers general halts including those a primary listing exchange declares, the other volatility pauses

One binds member firms and the other binds the facilities through which their trades are reported

One applies during the trading session and the other only before the opening or after the close

When was SEC Regulation NMS adopted and fully effective, and what did it do?

Adopted in 2010 and fully effective in 2012, in response to the disorderly trading of that period

Adopted in 2005 and fully effective in 2007, confining off-exchange trading to registered facilities

Adopted in 2005 and fully effective in 2007, establishing a unified framework across all trading venues

Adopted in 2000 and fully effective in 2001, alongside the move to decimal quotation increments

A volatility pause is in force on the listing exchange. Why can a member not simply route the trade to an off-exchange venue instead?

Because off-exchange venues must close for the rest of the session whenever any listing exchange suspends trading

Because the member would first need an exemption from its own primary listing exchange

Because a trade executed during a pause may be reported but is then repriced at the level where trading resumes

Because FINRA must enforce the same price bands and pauses on its own facilities as exchanges do

FINRA Rule 6100's sub-series sits alongside the sub-series covering the alternative display facility and the trade reporting facilities. How is the work divided?

By subject, one setting what must be done and the others the facilities through which it is done

By participant, one binding member firms and the others binding the facility operators, leaving members with no duties under them

By security type, one covering exchange-listed equities and the others covering equities that have no exchange listing at all

By timing, one governing pre-trade obligations and the others post-trade obligations

A member trades an equity security that is not exchange-listed. Which parallel sub-series covers the framework for it?

The same one, NMS stocks and unlisted equities being treated identically off-exchange

The parallel sub-series addressing OTC equity securities rather than NMS stocks

The alternative display facility sub-series, which covers quotation for unlisted securities

The sub-series covering fixed income reporting, which takes any security without a listing

Under SEC Regulation NMS, may an NMS stock priced at 60 cents and one priced at 25 dollars each be quoted in increments finer than one cent?

Neither may be, a one-cent minimum applying to every NMS stock whatever its price

Only the 25-dollar stock may be, the limit being aimed at stocks priced below one dollar

Only the 60-cent stock may be, the limit reaching stocks priced at a dollar or more

Both may be, the limit governing the prices shown on trade reports rather than on quotations

Which of these securities falls outside the definition of an NMS stock?

Common stock of a technology company listed on the Nasdaq Stock Market

Preferred stock that a company has listed on the New York Stock Exchange

Common stock of a smaller company listed on NYSE American rather than the NYSE

An exchange-listed option written on a New York Stock Exchange stock

One part of SEC Regulation NMS governs how market data in NMS stocks are disseminated. Through what are those data disseminated?

Each venue's own feed, with no consolidation across venues

A daily register of trades that the SEC compiles and publishes

The listing exchange's end-of-day bulletin of closing prices and volumes

A member buys shares of a stock listed on the New York Stock Exchange from another dealer, in a trade executed away from any exchange. How is the stock classified for this trade?

An OTC equity security for this trade, because it was executed over the counter

Still an NMS stock, since trading away from the exchange leaves its status unchanged

An NMS stock only once the trade has been reported to the exchange that lists it

Outside both categories, since a dealer-to-dealer trade has no venue to classify it

Off-exchange trading in NMS stocks has grown substantially as a share of total US equity volume over the past two decades. What has driven that growth?

A regulatory requirement that retail customer orders be executed away from the exchange that lists the stock

The delisting of smaller issuers, whose shares moved to dealer quotation systems once they left the exchanges

The proliferation of dark pools and broker internalisation programs that execute customer orders away from exchanges

The closure of regional exchanges, whose members then moved their trading onto FINRA's reporting facilities

Under the transaction reporting rules of the FINRA Rule 6100 sub-series, which participants can be exempted from the trade reporting obligation?

Members trading for their own proprietary account

Members whose off-exchange volume falls below a monthly threshold

Registered market makers on the alternative display facility

May a member use more than one Market Participant Identifier for its off-exchange activity in NMS stocks under the FINRA Rule 6100 sub-series?

Yes, within the rules the sub-series sets for using more than one identifier

No, each member holds a single identifier across every FINRA facility it uses

Yes, but only with the consent of the exchange listing each stock it trades

On the alternative display facility, though the trade reporting facilities allow just one each

How are the transaction reporting rules of the FINRA Rule 6100 sub-series arranged within it?

As supplementary material attached to the sub-series' trading halt rules, which the reporting provisions follow

As lettered sub-paragraphs of one comprehensive transaction reporting rule that carries every reporting obligation

Beneath a nested marker of their own, which groups them within the sub-series

As an appendix placed after the last of the trading practice rules

When a member reports an off-exchange short sale in an NMS stock, what must the trade report carry?

Nothing further, since short sales are reported like any other sale

The identity of the lender from whom the shares were borrowed

Confirmation that the shares were located before the order was entered

A designation identifying the transaction as a short sale

A company's initial public offering priced last night, and its primary listing exchange has not yet opened the stock for trading. A member wants to buy shares from another dealer off-exchange now. What does the FINRA Rule 6100 sub-series provide?

The member must wait until the listing exchange has opened the security for trading

The member may trade now if the trade is reported promptly to a trade reporting facility

The member may trade now, but only at the public offering price until the exchange opens

The member may trade now on an alternative trading system, though not by internalising

The child rule defining trading otherwise than on an exchange also establishes trading transparency publication obligations. On whom do those obligations fall?

On each market maker, for the quotations it displays off-exchange

On the primary listing exchange, for off-exchange volume in its listed stocks

On each member, for the customer orders it internalises

FINRA asks a member for information about the member's off-exchange trading activity in NMS stocks. What position does the FINRA Rule 6100 sub-series put the member in?

It may refer FINRA to the facility where it reported the trades, which holds the data

It must send the information to the SEC instead, FINRA being unable to require it directly

It is obliged to provide FINRA with information about its trading activities

It need respond only where the request is tied to an open disciplinary proceeding

How do the off-exchange standards of the FINRA Rule 6100 sub-series relate to the SEC Regulation NMS requirements that apply to exchange trading?

They cover the ground those requirements leave open, without repeating any of them

They are deliberately less demanding, so that off-exchange venues can compete with the exchanges

They are stricter, making up for the absence of an exchange's own surveillance of trading

They are consistent with those requirements and in many cases directly incorporate them

What does FINRA's alternative display facility provide for NMS stocks?

Quotation display, with trades reported through other facilities

Trade reporting for OTC equity securities not listed on any exchange

Order routing and execution linking the trading centres that use it

Suppose FINRA had no obligation to enforce the Limit Up-Limit Down Plan's trading pauses on its own facilities. What gap would that leave?

Exchanges would lose the power to declare pauses in the stocks that they list

Trading paused on the exchanges could carry on by being routed to off-exchange venues

Off-exchange trades would go unreported until the exchange pause had ended

The price bands would stop being calculated for stocks that trade mainly off-exchange

A member that has reported its off-exchange NMS stock trades through one FINRA facility switches its reporting to a different FINRA facility. What happens to its obligations under the FINRA Rule 6100 sub-series?

They pass to the new facility's sub-series, which replaces them for every trade the member reports there

They lapse until the member registers under the separate sub-series that governs the new facility

They stay the same; what changes is the facility through which it reports its trades

They apply again once FINRA approves the switch and assigns the member to the new facility

How does the transparency and reporting framework of the FINRA Rule 6100 sub-series bear on members' best execution obligations under FINRA Rule 5310?

It replaces best execution for off-exchange trades with a duty to report them promptly

It sets the venues to which members must route customer orders to achieve best execution

It exempts internalised customer orders from best execution, their prices being reported instead

It supplies the price information against which best execution compliance can be assessed

FINRA Rule 6100 Explained: Quoting and Trading in NMS Stocks

Quoting and Trading in NMS Stocks

FINRA Rule 6100 is the sub-series marker for the Quoting and Trading in NMS Stocks subsection of the FINRA Rule 6000 series — the organizational designation grouping all rules governing how member firms quote, trade, and report transactions in National Market System (NMS) stocks through FINRA's facilities outside of national securities exchanges.

FINRA Rule 6100 has no operative text of its own.

Its FINRA. page returns only the title — 6100. QUOTING AND TRADING IN NMS STOCKS — with no rule text, no amendment history, and no selected notices. It serves exclusively as the organizational container for its child rules.

FINRA Rule 6100 sits within the 6000 Quotation, Order, and Transaction Reporting Facilities series, immediately following FINRA Rule 6000's top-level series marker and immediately preceding FINRA Rule 6110, the first substantive child rule of the sub-series.

What NMS Stocks Are

An NMS stock — or National Market System stock — is any equity security other than an option for which transaction reports are collected, processed, and made available pursuant to an effective transaction reporting plan under SEC Regulation NMS. In practical terms, NMS stocks are the universe of U.S.-listed equity securities, including stocks listed on the New York Stock Exchange, the Nasdaq Stock Market, NYSE American, and other registered national securities exchanges. The NMS designation subjects these securities to the full regulatory framework of SEC Regulation NMS — including the Order Protection Rule (preventing trade-throughs of protected quotations), the Access Rule (ensuring fair access to quotations), the Sub-Penny Rule (restricting quotation increments for stocks priced at or above $1.00), and the Market Data Rules governing consolidated tape dissemination.

The Scope of FINRA Rule 6100's Sub-Series

FINRA Rule 6100's sub-series addresses the off-exchange dimension of NMS stock trading — member firm activity in NMS stocks that occurs outside national securities exchange matching engines, commonly referred to as over-the-counter trading in exchange-listed securities. Off-exchange trading in NMS stocks has grown substantially as a proportion of total U.S. equity trading volume over the past two decades, driven by the proliferation of alternative trading systems (ATSs), dark pools, and broker internalization programs that route and execute customer orders away from exchange venues.

The complete child rule list confirmed from the FINRA.org 6000 series page is: FINRA Rule 6110 (Trading Otherwise than on an Exchange), FINRA Rule 6120 (Trading Halts), FINRA Rule 6121 (Trading Halts Due to Extraordinary Market Volatility), FINRA Rule 6130 (Transactions Related to Initial Public Offerings), FINRA Rule 6140 (Other Trading Practices), FINRA Rule 6150 (Obligation to Provide Information), FINRA Rule 6151 (Disclosure of Order Routing Information for NMS Securities), FINRA Rule 6160 (Multiple MPIDs for Trade Reporting Facility Participants), FINRA Rule 6170 (Multiple MPIDs for Alternative Display Facility Participants), FINRA Rule 6180 (Transaction Reporting — itself a sub-marker), FINRA Rule 6181 (Timely Transaction Reporting), FINRA Rule 6182 (Trade Reporting of Short Sales), FINRA Rule 6183 (Exemption from Trade Reporting Obligation for Certain Alternative Trading Systems), FINRA Rule 6184 (Transactions in Exchange-Traded Managed Fund Shares), FINRA Rule 6190 (Compliance with Regulation NMS Plan to Address Extraordinary Market Volatility), and FINRA Rule 6191 (Compliance with Regulation NMS Plan to Implement a Tick Size Pilot Program).

The Sub-Series' Three Functional Clusters

FINRA Rule 6100's child rules address three distinct functional areas.

The first cluster — trading practices and restrictions — governs the behavioral standards for member firms engaging in off-exchange NMS stock activity. FINRA Rule 6110 defines what it means to trade otherwise than on an exchange and establishes FINRA's trading transparency publication obligations. FINRA Rules 6120 and 6121 govern when FINRA must halt off-exchange trading — Rule 6120 addressing general trading halts including Regulatory Halts declared by primary listing exchanges, and Rule 6121 addressing the specific Limit Up-Limit Down (LULD) Plan-based trading pauses for extraordinary market volatility. FINRA Rule 6130 restricts off-exchange trading in IPO securities before the primary listing exchange opens the security for trading. FINRA Rule 6140 establishes other trading practice standards including the bona fide quotation requirement and passive market making restrictions.

The second cluster — information and quotation obligations — addresses the transparency and market participant identifier requirements applicable to off-exchange NMS stock market participants. FINRA Rule 6150 governs members' obligations to provide information to FINRA about their trading activities. FINRA Rule 6151 addresses disclosure of order routing information under SEC Rule 606 of Regulation NMS. FINRA Rules 6160 and 6170 govern members' use of multiple Market Participant Identifiers (MPIDs) — the unique identifiers through which members identify themselves in trade reports and quotations submitted to FINRA's TRFs and ADF respectively.

The third cluster — transaction reporting — governs the post-trade transparency obligations applicable to off-exchange NMS stock transactions. FINRA Rule 6180 serves as a sub-marker organizing the transaction reporting rules. FINRA Rule 6181 establishes the 10-second timely transaction reporting requirement. FINRA Rule 6182 requires short sale designation in trade reports. FINRA Rule 6183 provides an exemption from transaction reporting obligations for certain alternative trading systems. FINRA Rule 6184 addresses specific reporting requirements for transactions in exchange-traded managed fund shares. And FINRA Rules 6190 and 6191 address compliance with the LULD Plan and the Tick Size Pilot Program respectively.

FINRA Rule 6100 and SEC Regulation NMS

SEC Regulation NMS — adopted in 2005 and fully effective in 2007 — fundamentally restructured U.S. equity market regulation by establishing a unified regulatory framework applicable across all trading venues for NMS stocks. FINRA Rule 6100's sub-series represents FINRA's implementation of Regulation NMS-consistent standards for the off-exchange dimension of NMS stock trading — ensuring that off-exchange trading operates under regulatory standards that are consistent with, and in many cases directly incorporate, the Regulation NMS requirements applicable to exchange trading.

The most direct Regulation NMS connection within FINRA Rule 6100's sub-series is through FINRA Rule 6190's compliance obligation — requiring FINRA to enforce the LULD Plan's price band and trading pause requirements on its ADF and TRF facilities, mirroring the identical obligation that Regulation NMS imposes on national securities exchanges. This parallel compliance structure ensures that LULD Plan protections apply uniformly across all trading venues, exchange and off-exchange alike, preventing market participants from circumventing trading pauses or price band limitations by routing trades to off-exchange venues during periods when exchange trading is restricted.

The Relationship Between FINRA Rule 6100 and FINRA Rules 6200, 6300, 6400, 6600, and 6700

FINRA Rule 6100's Quoting and Trading in NMS Stocks sub-series addresses the trading practice, information, and transaction reporting dimensions of off-exchange NMS stock activity — but does not itself establish the specific facilities through which that activity is reported. Those facilities are addressed in the parallel sub-series within FINRA Rule 6000: FINRA Rule 6200 (Alternative Display Facility, providing both quotation display and trade reporting for NMS stocks), FINRA Rule 6300 (Trade Reporting Facilities, providing transaction-only reporting for off-exchange NMS stock trades through the FINRA/Nasdaq TRF and FINRA/NYSE TRF), FINRA Rule 6400 (addressing the parallel framework for OTC equity securities rather than NMS stocks), FINRA Rule 6600 (OTC Reporting Facility for OTC equity transactions), and FINRA Rule 6700 (TRACE for fixed income securities).

This organizational structure — FINRA Rule 6100 governing what must be done (trading practices, information obligations, transaction reporting) while FINRA Rules 6200 and 6300 govern the specific facilities through which transaction reporting is accomplished — reflects FINRA's separation of substantive trading standards from the operational mechanics of the specific reporting facilities.

Connection to FINRA Rules 5310, 6000, 6110, 6120, 6121, 6130, 6140, 6180, 6181, 6182, 6190, 6200, 6300, and SEC Regulation NMS

FINRA Rule 6100 connects to FINRA Rule 6000 as its parent series marker. It connects to FINRA Rule 5310 — whose best execution obligations require members to seek the most favorable terms reasonably available for customer orders in NMS stocks, with FINRA Rule 6100's transparency and reporting framework providing the price information infrastructure through which best execution compliance can be assessed. It connects to SEC Regulation NMS — whose Order Protection Rule, Access Rule, Sub-Penny Rule, and Market Data Rules provide the federal regulatory backdrop within which FINRA Rule 6100's child rules operate. And it connects to each of its confirmed child rules — FINRA Rules 6110 through 6191 — as the operative provisions whose collective content gives FINRA Rule 6100's Quoting and Trading in NMS Stocks sub-series its substantive meaning.

Examination Relevance and Key Takeaways

FINRA Rule 6100 is tested on the Series 7 and Series 24 examinations as the organizational framework for off-exchange NMS stock trading — providing the context for understanding how the specific trading practice, information, and transaction reporting rules in the 6110 through 6191 series relate to each other and to the broader market structure.

The key points to retain are these:

FINRA Rule 6100 has no operative text — it organizes the Quoting and Trading in NMS Stocks sub-series; NMS stocks are exchange-listed equity securities subject to SEC Regulation NMS; the sub-series addresses three functional clusters — trading practices and restrictions (FINRA Rules 6110 through 6140), information and quotation obligations (FINRA Rules 6150 through 6170), and transaction reporting (FINRA Rules 6180 through 6191); the sub-series governs the off-exchange dimension of NMS stock trading — member firm activity occurring outside national securities exchange matching engines through ATSs, dark pools, and broker internalization; and FINRA Rule 6100's child rules implement Regulation NMS-consistent standards for off-exchange trading, with FINRA Rule 6190's LULD Plan compliance obligation ensuring parallel application of extraordinary market volatility protections across all trading venues.