The exchange-listed framework sets a thirty-minute baseline with an extraordinary-circumstances exception. What timing standard governs a FINRA officer acting on an OTC equity security?

The same thirty-minute baseline as the listed market, with the identical extraordinary-circumstances exception applying to it as well

A thirty-minute baseline with no exception at all, the thinner OTC market being thought to require faster resolution than listed trading

No fixed deadline at all, the officer acting whenever the circumstances of the matter permit, however long that takes

How does the OTC Numerical Guidelines table differ in structure from the exchange-listed one?

It uses fewer tiers than the listed table, the OTC market's price range being much the narrower of the two

It sets one threshold for all prices, tiering by trading volume rather than by price level

It uses seven tiers spanning under a dollar to over a thousand, against three topping out above fifty

It applies the listed table directly, adjusted by a factor for the security's own liquidity

Some of the OTC tiers are expressed as a range rather than a flat figure. Within such a range, which execution prices attract the maximum and the minimum percentage?

The maximum applies to the lower price in the range and the minimum to the higher price

The maximum applies at both ends, the minimum applying only in the range's middle

The maximum applies to the higher price in the range and the minimum to the lower price

The maximum applies to whichever price the officer selects as the Reference Price

Suppose the tiers were flat rather than ranged, so one tier carried ten per cent and the next five. What would happen to two securities priced a single cent apart on either side of that boundary?

Both of them would be measured against the lower of the two thresholds, that being the more protective figure

They would face thresholds differing by half, purely because of which side of the line they fell

Neither would be reviewable, a boundary case being referred to the Committee instead

The officer would interpolate between the two thresholds, as the range-based tiers now do

Against what price is an OTC equity transaction's deviation measured?

The closing price reported for the security on the previous trading day

The midpoint of the best quotations displayed at the time of execution

The ordinary Reference Price is unavailable or unrepresentative because of unusual circumstances surrounding a transaction. What does the rule permit?

The transaction to be reviewed without reference to any price at all

The matter to be referred directly to the Uniform Practice Code Committee

The review to be deferred until such time as the ordinary Reference Price becomes available

An alternative Reference Price to be used in place of the ordinary one

The OTC framework lists additional factors a FINRA officer may consider. What is their relationship to the factors the exchange-listed framework lists?

They are drawn from the same vocabulary as the exchange-listed framework's factors

They replace the exchange-listed factors, which no longer apply to any security

They are entirely distinct, reflecting the different information available in each market

They apply only where the exchange-listed factors have produced no clear answer

What does excluding exchange-traded securities from the OTC definition achieve, as between the exchange-listed rule and the OTC rule?

It leaves a security traded on an exchange and over the counter outside either rule's coverage entirely

It makes the two scopes mutually exclusive, an equity security falling within exactly one

It gives the officer a choice of which framework to apply to a dual-traded security

It confines the OTC rule to securities that have never been listed on any exchange

How has FINRA historically applied its clearly erroneous authority to OTC Equity Securities?

Only where each party to the transaction has joined in requesting that it be reviewed

On the same basis as to exchange-listed securities, the guidelines differing only in their figures

In only very limited circumstances, such as an extraordinary event materially affecting the market

More readily than to listed securities, the absence of Price Bands leaving no other safeguard

Two features of the OTC equity market underpin the limited application of this authority. What are they?

Lower trading volumes, and the absence of a designated market maker for most securities

The absence of Price Bands, and the shorter settlement cycle applying to such securities

Wider spreads, and the fact that most such securities trade on a single quotation medium

The absence of listing-driven information flows, and that aberrant trading there often has other causes

Two members dispute the terms of an executed transaction in an OTC equity security. How does FINRA expect such a dispute to be resolved?

Privately between the parties, FINRA not expecting to use its authority in the vast majority of cases

Through the Uniform Practice Code Committee, which hears matters in OTC equity securities in the first instance

Through a FINRA officer's review, the framework existing for exactly this purpose

Through arbitration, the clearly erroneous framework being unavailable to member disputes

Must a member first ask for review before a FINRA officer may examine a transaction in an OTC equity security under the clearly erroneous framework?

Yes — the request must come from the member that reported the trade

No — the officer may review the transaction on his or her own motion

Yes — the officer acts only on a written request from a party to the trade

No — but the officer may act only on a referral from the Committee

Which transactions in OTC equity securities fall within the reach of the FINRA officer's clearly erroneous review authority?

Only those in securities carrying a published two-sided quotation on an interdealer quotation system

Only those executed by a member that is registered as a market maker in that particular security at the time

Any arising out of or reported through a Commission-authorised trade reporting system that FINRA owns or operates

Only those cleared and settled through a registered clearing agency on the standard settlement cycle

A single systems malfunction generates a large number of erroneous executions, all in one OTC equity security, and a FINRA officer declares them null and void. Can that determination be made final without any appeal?

Yes, but only where every one of the affected executions occurred within a single five-minute window

No — only an event involving twenty or more securities can be made final without an appeal to the Committee

No — a determination on an OTC equity security remains open to appeal under every circumstance whatever

Yes, if the officer also finds the number of affected trades makes immediate finality necessary, however few securities are involved

An OTC equity trade is away from its Reference Price by less than the applicable Numerical Guideline. News about the issuer had just been released, and the execution was inconsistent with the stock's trading pattern. Can the trade be found clearly erroneous?

No — a deviation short of the guideline rules the finding out, whatever else surrounds the trade

Yes — the news and the pattern together can make up for the deviation that is missing

Yes — a news release lowers the applicable guideline to half its ordinary figure

No — unless both parties to the trade agree that an error was in fact made

An OTC equity trade's price is away from its Reference Price by exactly the percentage the applicable Numerical Guideline specifies, and no more. Does the trade meet the threshold for a clearly erroneous finding?

No — a deviation landing exactly on the guideline is treated as ordinary trading

Yes — a deviation that equals the guideline meets it, nothing beyond it being required

No — the deviation must exceed the guideline by some margin before it counts

Yes, but only where the Reference Price for the security is at least one dollar

What Numerical Guideline applies to an OTC equity security whose Reference Price is forty cents?

A range running from 20 per cent down to 10 per cent

The OTC tier for Reference Prices from $500.0000 to $999.9999 is expressed as a range. What thresholds apply at its low and high ends?

10 per cent at the low end and 3 per cent at the high end

6 per cent at the low end and 3 per cent at the high end

10 per cent at the low end and 5 per cent at the high end

5 per cent at the low end and 3 per cent at the high end

Why might a last-sale anchor serve poorly as the baseline for reviewing trades in many OTC equity securities?

They may trade so seldom that the last sale can lie well before the trade under review

They are quoted in fractions, so a last sale cannot be converted into a comparable decimal price

Their last sales are reported only at the close, so no intraday last sale exists to anchor to

Their trades are reported without a time stamp, so the order of the sales cannot be known

How does a prevailing market price just prior to the trade compare in breadth with a consolidated last sale as a baseline?

It is identical in content, the two phrases simply being different names for the one most recent trade reported to the tape

It is broader, since it may draw on quotations as well as trades, where a last sale is one reported trade

It is narrower, since it counts only trades printed on one venue, where a last sale spans every venue reporting to the tape

It is fixed at the prior close, where a last sale follows every trade reported during the session

The OTC rule names examples of the unusual circumstances in which FINRA may depart from the default Reference Price. Which does it name?

Trading outside normal hours, a late trade report, or a trade by an affiliate of the issuer

A request by either party, a disputed trade report, or a price reached only once that day

Wide quoted spreads, a single quoting market maker, or a price below one dollar a share

Where a series of executions rather than one transaction is under review, why may FINRA anchor to the last sale before the whole series rather than the sale just before each trade?

A single baseline shortens the review, and speed takes priority over accuracy in a series of trades

A series must be reviewed against a fixed thirty per cent threshold, which needs a single common baseline

The parties to a series of executions are presumed to have agreed a single price for all of them

For later trades in the series, the sale just before them may itself reflect the distortion being reviewed

The alternative Reference Prices are the consolidated inside price, opening price, prior close, and last sale before a series of executions. What sets the inside price apart from the other three?

It rests on the best quoted bid and offer rather than on any executed transaction

It reflects the final trade of the previous session rather than any trade on the day of review

It alone may be used without FINRA first finding that unusual circumstances exist at all

It is set by the officer's own estimate of value, with no reference to quotations or trades

An OTC equity security has just undergone a stock split, and a trade shortly afterwards prints far from the pre-split price. How does the split figure in the officer's determination?

As requiring the prior close to be used in place of the default Reference Price

As one of the additional factors the officer may take into account

As a bar to review, corporate actions being left to the issuer to correct

As halving the Numerical Guideline that would otherwise apply to the trade

The OTC and exchange-listed rules list essentially the same additional factors. What, then, separates the two rules in the discretionary part of a clearly erroneous determination?

Which party to the trade bears the burden of proving each listed factor

The weight each listed factor carries, which the OTC rule fixes in advance

How readily FINRA exercises its clearly erroneous authority in the first place

Whether the officer must address every listed factor in a written ruling

An equity security that would otherwise meet the base OTC equity definition is also traded on a national securities exchange. A member disputes an over-the-counter trade in it as clearly erroneous. Which framework governs?

Neither framework, dual-traded securities falling outside the cluster altogether

The OTC framework, the disputed trade itself having been executed over the counter

Both frameworks, the officer applying whichever of the two thresholds is the lower

The exchange-listed framework, the security being excluded from the OTC definition

The OTC equity market lacks the compulsory information flows that the listing process produces. Why does that tell against FINRA's use of its clearly erroneous authority there?

It makes it harder to establish with confidence what the security's value should be at any moment

It means the trades cannot be matched to a counterparty with any certainty once they have been executed and reported

It means no Reference Price can be determined for the security, so no Numerical Guideline can ever be applied to it

It means the issuer, rather than FINRA, becomes responsible for correcting any erroneous prices printed in its securities

How does the OTC clearly erroneous framework relate to the Price Bands of the Limit Up-Limit Down Plan?

It uses the Price Bands in place of its Numerical Guidelines above one dollar

It operates independently of them, its thresholds owing nothing to the Price Bands

It treats any trade outside the Price Bands as void without the need for review

It limits review to trades outside the Price Bands during Normal Market Hours

In which of these respects does the OTC clearly erroneous rule share the exchange-listed rule's approach rather than depart from it?

The default price against which a trade's deviation is measured

The timing standard within which the officer must act on a transaction

The grounds on which a transaction may be declared null and void

The structure of the tiers in the Numerical Guidelines table

Member A sold an OTC equity security to Member B well above where the market stood, and a FINRA officer then declared the trade null and void, to Member B's advantage. Who must be notified of the determination, and by whom?

Only Member A must be told, and the notice comes from the member that reported the trade to FINRA, not from FINRA itself

FINRA must notify only Member A, as the member that loses a favourable above-market sale when the trade is voided

Both members must be told, but the notice comes from the member that reported the trade to FINRA, not from FINRA itself

FINRA must notify both members, Member B as well as Member A, although Member B gains from the trade being voided

FINRA Rule 11893: Clearly Erroneous OTC Equity Trades

What Does FINRA Rule 11893 Require for Clearly Erroneous Transactions in OTC Equity Securities?

FINRA Rule 11893 establishes the clearly erroneous transaction framework for OTC Equity Securities — structurally parallel to FINRA Rule 11892's exchange-listed framework in its FINRA officer authority and Additional Factors provisions, but substantively distinct in its Numerical Guidelines table structure, its Reference Price default, and — most importantly — accompanied by Supplementary Material .01's explicit policy that this authority is exercised over OTC equity securities in only very limited circumstances. The rule operates through three lettered paragraphs.

Paragraph (a), Procedures for Reviewing Transactions, establishes the FINRA officer's own-motion review authority, the null-and-void grounds (clearly erroneous, or necessary for fair-and-orderly-market and investor-protection purposes), a single as-soon-as-possible-but-no-later-than-the-start-of-trading-on-the-following-day timing standard, and the FINRA Rule 11894 appeal framework, with an immediate-finality exception where the number of affected transactions warrants it.

Paragraph (b), Clearly Erroneous Factors, establishes three components: a seven-tier Numerical Guidelines table with range-based, "smoothed" percentage thresholds across OTC equity price levels, anchored to the prevailing market price just prior to the trade; Alternative Reference Prices available in unusual circumstances; and an Additional Factors list this dictionary has now encountered, in substantially identical form, in FINRA Rule 11892.

Paragraph (c) defines "OTC Equity Security" by cross-reference to FINRA Rule 6420, with an express exclusion for any equity security traded on a national securities exchange. Supplementary Material .01 establishes the limited-application policy and its rationale.

FINRA Rule 11893 was most recently amended by SR-FINRA-2023-017 effective May 28, 2024 — the T+1 settlement cycle conformity amendment this dictionary has traced through FINRA Rules 11140, 11150, 11210, 11320, 11620, and 11860 — with prior amendments by SR-FINRA-2015-034 effective December 20, 2015, SR-FINRA-2010-002 effective February 15, 2010, and its original adoption by SR-FINRA-2009-068, also effective February 15, 2010. Three selected notices are associated — 10-04, 16-04, and 24-04.

FINRA Rule 11893 sits within the 11890 Clearly Erroneous Transactions cluster of the 11000 Uniform Practice Code as its third rule, immediately following FINRA Rule 11892's exchange-listed securities framework and immediately preceding FINRA Rule 11894's UPC Committee review framework, the final rule of the cluster and of the entire FINRA Rule 11800 Close-Out Procedures subsection.

FINRA Rule 11893(a): The FINRA Officer Framework and Its Single-Deadline Timing Standard

FINRA Rule 11893(a) vests review authority in the same category of official this dictionary encountered in FINRA Rule 11892(a)(1) — an Executive Vice President of FINRA's Market Regulation Department or Transparency Services Department, or any officer designated by such Executive Vice President. This officer may, on his or her own motion — without requiring a member's request — review any transaction involving an OTC Equity Security arising out of or reported through a trade reporting system owned or operated by FINRA or FINRA Regulation and authorized by the Commission.

The null-and-void grounds mirror FINRA Rule 11892(a)(1) precisely: the officer may declare a transaction null and void upon determining either (A) the transaction is clearly erroneous — invoking FINRA Rule 11891's core "obvious error" definition examined in this dictionary's earlier entry — or (B) such actions are necessary for the maintenance of a fair and orderly market or the protection of investors and the public interest — the same standard FINRA Rule 11891 Supplementary Material .02 first articulated, and which this dictionary has now traced through FINRA Rule 11892's paragraph (a), (b)(2)(C), (d), and (e).

The timing standard, however, departs meaningfully from FINRA Rule 11892's structure. Recall that FINRA Rule 11892(a)(1) established a dual standard — absent extraordinary circumstances, generally within 30 minutes after becoming aware of the transaction; when extraordinary circumstances exist, no later than the start of trading on the day following the date of execution. FINRA Rule 11893(a), by contrast, establishes a single, unitary standard — the officer shall take action pursuant to this paragraph as soon as possible after becoming aware of the transaction, but in all cases no later than the start of trading on the day following the date of the transaction(s) at issue.

This single-deadline approach dispenses with FINRA Rule 11892's bifurcated 30-minute/extraordinary-circumstances structure entirely.

Where FINRA Rule 11892's bifurcation reflects the high-frequency, continuously-monitored character of exchange-listed trading — where LULD Price Bands, consolidated tapes, and automated surveillance systems make a 30-minute baseline both achievable and meaningful for the overwhelming majority of reviewable transactions, with the extraordinary-circumstances exception reserved for genuinely unusual situations — FINRA Rule 11893's OTC equity context, governed by Supplementary Material .01's limited-application policy, does not present the same volume of routine, rapid-turnaround determinations.

A single as soon as possible, but no later than the start of trading on the following day standard provides adequate flexibility for the comparatively rare circumstances in which FINRA actually exercises this authority over OTC equity securities, without the administrative complexity of distinguishing ordinary from extraordinary circumstances for a category of determination that is, per Supplementary Material .01, itself extraordinary in the first instance.

The notification-and-appeal framework also parallels, but does not precisely replicate, FINRA Rule 11892(a)(2). Each party involved in the transaction shall be notified as soon as practicable by FINRA, and the party aggrieved by the action may appeal such action in accordance with Rule 11894 — establishing the same FINRA Rule 11894 appeal pathway this dictionary anticipates examining next.

The carve-out from appealability, however, differs in formulation from FINRA Rule 11892(a)(2)'s two carve-outs (LULD-Price-Band-related Supplementary Material .02 determinations, and joint-SRO rulings).

FINRA Rule 11893(a)'s sole carve-out applies unless the officer making the determination also determines that the number of the affected transactions is such that immediate finality is necessary to maintain a fair and orderly market and to protect investors and the public interest.

This immediate-finality carve-out generalizes the concept this dictionary examined in connection with FINRA Rule 11892(b)(2)(B)'s Multi-Stock Events involving twenty or more securities — there, the rule recognizes that the number of affected transactions may be such that immediate finality is necessary to maintain a fair and orderly market. FINRA Rule 11893(a) applies this same underlying logic — number of affected transactions warranting immediate finality — without tying it to FINRA Rule 11892's specific "Multi-Stock Event" defined terminology or its five-minute execution window.

For OTC equity securities, a situation involving a large number of affected transactions (for example, arising from a single systems malfunction generating numerous erroneous OTC executions) could trigger this immediate-finality carve-out on its own terms, without needing to satisfy FINRA Rule 11892's Multi-Stock Event-specific definitional requirements — a sensible adaptation given that FINRA Rule 11893 operates independently of the LULD Plan infrastructure those FINRA Rule 11892 provisions are built around.

FINRA Rule 11893(b)(1): The Numerical Guidelines Table in Detail

FINRA Rule 11893(b)(1) establishes the threshold requirement — a transaction in an OTC Equity Security may be found to be clearly erroneous under this Rule only if the execution price of the transaction is away from the Reference Price by an amount that equals or exceeds the Numerical Guidelines set forth below. The "only if" formulation here is significant — it establishes the Numerical Guidelines as a necessary (though, per paragraph (b)(3)'s Additional Factors, not necessarily sufficient on their own in every analytical sense) gateway condition: a transaction whose price deviation falls short of the applicable Numerical Guideline cannot be found clearly erroneous under FINRA Rule 11893, regardless of whatever Additional Factors might otherwise be present.

The table itself establishes seven price tiers, moving from the lowest-priced OTC equity securities to the highest:

For securities with a Reference Price of ninety-nine and ninety-nine hundredths cents and under, the threshold is a flat 20% — the highest percentage threshold in the table, presumably reflecting that very low-priced securities (sometimes informally called "penny stocks") exhibit proportionally larger ordinary price movements, such that even a substantial percentage deviation may represent ordinary trading rather than an obvious error.

For securities with a Reference Price from one dollar through four dollars and ninety-nine and ninety-nine hundredths cents, inclusive, the table specifies a range: Low end of range minimum 20% – High end of range minimum 10%. This is the first of three range-based ("smoothed") tiers this dictionary will examine below.

For securities with a Reference Price from five dollars through seventy-four dollars and ninety-nine and ninety-nine hundredths cents, inclusive, the threshold is a flat 10% — covering what might be considered the broad middle range of actively-traded OTC equity securities.

For securities with a Reference Price from seventy-five dollars through one hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, inclusive, the table again specifies a range: Low end of range minimum 10% – High end of range minimum 5% — the second smoothed tier.

For securities with a Reference Price from two hundred dollars through four hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, inclusive, the threshold is a flat 5%.

For securities with a Reference Price from five hundred dollars through nine hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, inclusive, the table specifies a third range: Low end of range minimum 5% – High end of range minimum 3% — the third and final smoothed tier.

And for securities with a Reference Price of one thousand dollars and over, the threshold is a flat 3% — the lowest percentage threshold in the table, presumably reflecting that very high-priced securities exhibit proportionally smaller ordinary price movements in percentage terms, such that even a modest percentage deviation may represent a meaningfully anomalous price.

The Smoothing Mechanism: How the Range-Based Tiers Operate

FINRA Rule 11893(b)(1)'s second and third sentences explain how the three range-based tiers operate — in some instances, the Numerical Guidelines set forth below are based on a range where the maximum percentage difference applies to the lower execution price in the range and the minimum percentage difference applies to the higher execution price in the range. The range is intended to smooth the percentage changes from tier to tier and allow for more gradual deviations.

To understand why this smoothing matters, consider what a purely flat-tier table (without ranges) would produce at a tier boundary. If the tier from five dollars to seventy-four dollars and ninety-nine and ninety-nine hundredths cents carried a flat 10% threshold and the immediately following tier — say, seventy-five dollars and above — carried a flat 5% threshold, then a security trading at seventy-four dollars and ninety-nine cents would be subject to a 10% clearly-erroneous threshold, while a security trading at seventy-five dollars — a price differing by a single cent — would suddenly be subject to a 5% threshold, half as large. Two securities of essentially identical price would face dramatically different clearly-erroneous standards purely as an artifact of which side of an arbitrary price boundary they happened to fall on.

FINRA Rule 11893(b)(1)'s range-based tiers eliminate this discontinuity. Consider the range from seventy-five dollars to one hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, specified as Low end of range minimum 10% – High end of range minimum 5%. At the range's low end (seventy-five dollars), the threshold is 10% — matching the flat 10% threshold of the immediately preceding tier from five dollars to seventy-four dollars and ninety-nine and ninety-nine hundredths cents, so a security trading at seventy-four dollars and ninety-nine cents (10% threshold) and a security trading at seventy-five dollars (10%, at the low end of the new range) face essentially the same standard.

At the range's high end (one hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents), the threshold has gradually decreased to 5% — matching the flat 5% threshold of the immediately following tier from two hundred dollars to four hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, so a security trading at one hundred ninety-nine dollars and ninety-nine cents (close to 5%) and a security trading at two hundred dollars (flat 5%) again face essentially the same standard.

Between these endpoints, the threshold presumably interpolates — gradually decreasing from 10% toward 5% as the Reference Price increases from seventy-five dollars toward one hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents — though the rule's text does not specify the precise interpolation formula (linear or otherwise) beyond establishing the two endpoint values and the smoothing purpose.

The same smoothing logic applies to the range from one dollar to four dollars and ninety-nine and ninety-nine hundredths cents (smoothing between the flat 20% of the tier for Reference Prices of ninety-nine and ninety-nine hundredths cents and under and the flat 10% of the tier from five dollars to seventy-four dollars and ninety-nine and ninety-nine hundredths cents, with the range's low end at 20% and high end at 10%) and the range from five hundred dollars to nine hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents (smoothing between the flat 5% of the tier from two hundred dollars to four hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents and the flat 3% of the tier for Reference Prices of one thousand dollars and over, with the range's low end at 5% and high end at 3%).

This range-based smoothing structure represents a meaningful point of structural distinction from FINRA Rule 11892's Numerical Guidelines table, which this dictionary examined as using flat percentage tiers (10%/20%, 5%/10%, 3%/6% across three price bands, inside/outside Normal Market Hours respectively) without an analogous range-based smoothing mechanism. This dictionary notes this as a confirmed structural difference between the two rules' tables — FINRA Rule 11893's seven-tier, partially-range-based table providing more granular, boundary-discontinuity-free thresholds across a wider span of price levels (from under one dollar to over one thousand dollars) than FINRA Rule 11892's three-tier flat table (covering up to fifty dollars and above, with the table's highest flat tier applying to all prices above fifty dollars).

The Reference Price: "Prevailing Market Price Just Prior to the Time of the Trade"

FINRA Rule 11893(b)(1)'s final sentence establishes the default Reference Price — the Reference Price will generally be the prevailing market price just prior to the time of the trade.

This formulation — prevailing market price just prior to the time of the trade — differs in its precise wording from FINRA Rule 11892(c)'s default Reference Price, which this dictionary examined as the consolidated last sale immediately prior to the execution(s) under review. While both formulations point toward a similar underlying concept — the market price immediately before the transaction under review — the prevailing market price formulation in FINRA Rule 11893(b)(1) is somewhat broader than FINRA Rule 11892(c)'s more specific consolidated last sale anchor. The prevailing market price could, depending on context, be informed by the prevailing bid, offer, or midpoint, or by the most recent transaction price, or by some combination — whereas consolidated last sale refers specifically to the most recent reported transaction price across the consolidated tape.

This difference plausibly reflects the different market-structure environments the two rules address. Exchange-listed securities, with their continuous consolidated tape and (for LULD-covered securities) continuously-updated Price Bands, present a relatively unambiguous consolidated last sale at almost any point in time. OTC equity securities — particularly the less liquid securities for which FINRA Rule 11893's lower price tiers (and Supplementary Material .01's limited-application policy) are most likely to be relevant — may trade considerably less frequently, such that a strict consolidated-last-sale anchor might, at certain points in time, refer to a transaction that occurred a considerable interval before the transaction under review. The somewhat more flexible prevailing market price formulation may afford FINRA officers slightly greater latitude in identifying an appropriate baseline price for thinly-traded OTC equity securities, before resorting to paragraph (b)(2)'s Alternative Reference Prices for genuinely unusual circumstances.

FINRA Rule 11893(b)(2): Alternative Reference Prices for Unusual Circumstances

FINRA Rule 11893(b)(2) establishes the departure mechanism from paragraph (b)(1)'s default — in unusual circumstances, which may include periods of extreme market volatility, sustained illiquidity, or widespread system issues, FINRA may, in its discretion and with a view toward maintaining a fair and orderly market and the protection of investors and the public interest, use a Reference Price other than the prevailing market price just prior to the time of the trade.

The three enumerated unusual circumstances — extreme market volatility, sustained illiquidity, and widespread system issues — directly parallel the catch-all category this dictionary examined in FINRA Rule 11892(c)(3), which used a closely similar formulation (relevant news impacting a security or securities, periods of extreme market volatility, sustained illiquidity, or widespread system issues) for that rule's third Reference Price exception, adding relevant news to the same three circumstances. This shared vocabulary across FINRA Rule 11892(c)(3) and FINRA Rule 11893(b)(2) confirms these as common concepts operating across both rules within the FINRA Rule 11890 cluster — situations where the ordinary default Reference Price (consolidated last sale for FINRA Rule 11892; prevailing market price just prior to the trade for FINRA Rule 11893) may not represent a reliable baseline, warranting a substitute.

The four enumerated alternative Reference Prices — the consolidated inside price, the consolidated opening price, the consolidated prior close, or the consolidated last sale prior to a series of executions — each represent a different temporal or structural anchor point. The consolidated inside price refers to the best bid and offer across the consolidated quotation system at the relevant time — a quote-based, rather than transaction-based, reference.

The consolidated opening price anchors to the trading day's opening, useful where the unusual circumstance (for example, overnight news) makes any intraday price suspect. The consolidated prior close anchors to the previous trading day's close — a baseline unaffected by whatever intraday disruption is occurring. And the consolidated last sale prior to a series of executions addresses precisely the scenario this dictionary examined in connection with FINRA Rule 11892(b)(2)(B)'s Multi-Stock Event framework and FINRA Rule 11892(d)'s Multi-day Events — where a series of transactions, rather than a single isolated transaction, is under review, the relevant baseline becomes the last sale prior to that entire series, rather than the last sale immediately prior to any individual transaction within it (which, for transactions occurring later in the series, might itself already reflect the very price distortion under review).

FINRA Rule 11893(b)(3): The Additional Factors — A Shared Vocabulary with FINRA Rule 11892

FINRA Rule 11893(b)(3) provides a list of Additional Factors a FINRA officer may consider — including but not limited to system malfunctions or disruptions; volume and volatility for the security; derivative securities products that correspond to greater than 100% in the direction of a tracking index; news released for the security; whether trading in the security was recently halted/resumed; whether the security is an IPO; whether the security was subject to a stock-split, reorganization, or other corporate action; overall market conditions; Opening and Late Session executions; validity of the consolidated tapes, trades and quotes; consideration of primary market indications; and executions inconsistent with the trading pattern in the stock — each considered with a view toward maintaining a fair and orderly market and the protection of investors and the public interest.

This list is, in its enumerated content, essentially identical to FINRA Rule 11892(b)(2)(C)'s Additional Factors list examined in this dictionary's earlier entry — confirming that, notwithstanding the structural differences this entry has identified between the two rules' core frameworks (timing standards, Numerical Guidelines table structure, Reference Price defaults), the underlying considerations FINRA officers weigh in the discretionary, context-dependent dimension of a clearly erroneous determination are shared across both the exchange-listed and OTC equity contexts. A system malfunction, an unusual volume or volatility profile, a leveraged derivative product's mechanically-amplified price movement, a news event, a recent halt or resumption, IPO status, a corporate action, broader market conditions, session-timing considerations, consolidated tape data-quality questions, primary-market indications, and trading-pattern inconsistency are each, in principle, equally relevant whether the security under review is exchange-listed or trades over-the-counter — what differs between the two rules is not which factors might bear on the analysis, but rather (per Supplementary Material .01) how readily, and under what overall posture, FINRA's clearly erroneous authority is actually exercised in the first place for OTC equity securities specifically.

FINRA Rule 11893(c): "OTC Equity Security" — The Rule 6420 Cross-Reference

FINRA Rule 11893(c) defines the rule's central scope-determining term — for purposes of this Rule, the term "OTC Equity Security" has the same meaning as defined in Rule 6420, except that the term shall not include any equity security that is traded on any national securities exchange.

FINRA Rule 6420, titled Definitions, sits within FINRA's 6400 Series, Quoting and Trading in OTC Equity Securities. By incorporating FINRA Rule 6420's definition as its base, FINRA Rule 11893(c) draws on whatever comprehensive definitional framework FINRA Rule 6420 establishes for OTC equity securities generally — a framework this dictionary has not previously needed to examine in connection with the 11000 series.

The except clause then performs the critical scope-allocation function within the FINRA Rule 11890 cluster — by excluding any equity security that is traded on any national securities exchange from FINRA Rule 11893's OTC Equity Security definition, paragraph (c) ensures that FINRA Rule 11892's exchange-listed securities scope and FINRA Rule 11893's OTC Equity Securities scope do not overlap. A given equity security falls within exactly one of these two rules' scope at any given time — exchange-listed securities (however FINRA Rule 11892 itself defines that category, presumably also by reference to relevant Exchange Act or exchange-listing concepts) fall under FINRA Rule 11892, while equity securities meeting FINRA Rule 6420's OTC Equity Security definition but not traded on any national securities exchange fall under FINRA Rule 11893.

This mutual-exclusivity structure ensures the FINRA Rule 11890 cluster's two security-category-specific rules together provide complete, non-overlapping coverage of equity securities generally (with debt securities, rights, warrants, and other non-equity instruments presumably falling outside both rules' scope, though this dictionary does not assert this beyond what paragraph (c)'s text directly establishes for equity securities specifically).

Supplementary Material .01: The Limited-Application Policy, Its Two-Part Rationale, and the Private-Settlement Expectation

Supplementary Material .01, Limited Application of Clearly Erroneous Authority to Transactions in OTC Equity Securities, establishes the single most consequential piece of guidance within FINRA Rule 11893 — with respect to OTC Equity Securities in particular, FINRA historically has applied its clearly erroneous authority in only very limited circumstances, for example, where there is an extraordinary event that has had a material effect on the market for the OTC Equity Security and the canceling of trades is necessary to protect investors and ensure a fair and orderly marketplace.

The "historically" framing is notable — it signals that this limited-application posture is not merely an aspirational or prospective policy, but reflects FINRA's actual, observed pattern of exercising (or, more precisely, generally not exercising) this authority over OTC equity securities. The example given — an extraordinary event that has had a material effect on the market for the OTC Equity Security, where canceling trades is necessary to protect investors and ensure a fair and orderly marketplace — directly echoes FINRA Rule 11891 Supplementary Material .03's extraordinary market conditions framing, which this dictionary examined as describing situations where an extraordinary event has occurred or is ongoing that has had a material effect on the market for a security traded over-the-counter. Supplementary Material .01's example for FINRA Rule 11893 thus represents the OTC-specific application of the very category FINRA Rule 11891 Supplementary Material .03 anticipated.

The second sentence provides the rationale, structured around two distinct points of contrast between the OTC equity and exchange-listed markets. The first point — the lack of compulsory information flows in the OTC equity market that come as a result of the listing process — identifies an informational asymmetry. National securities exchanges impose listing requirements on the securities they list, and these requirements generate certain standardized, compulsory information flows (financial reporting, corporate action disclosures processed through the listing exchange, and so on) that, among other things, feed into the kind of consolidated-tape and LULD-Plan infrastructure this dictionary examined extensively in connection with FINRA Rule 11892. OTC equity securities — many of which are not subject to the same listing-driven disclosure regime — may lack this informational infrastructure, making it correspondingly more difficult for FINRA to establish, with the same confidence, what a security's theoretical or fundamental value should be at any given moment — a determination that FINRA Rule 11892(c)(2)'s erroneous-Reference-Price framework (with its theoretical value language) presupposes can be made with reasonable confidence for exchange-listed securities undergoing corporate actions.

The second point — the fact that aberrant trading in the OTC equity market is often due to issues other than systems problems or extraordinary events — is, if anything, more consequential still. This dictionary's earlier entry on FINRA Rule 11891 examined Supplementary Material .04's Account Intrusion provision, which confirmed that FINRA's clearly erroneous authority under the Rule 11890 Series does not extend to unauthorized trading activity or attempts to manipulate stock prices by illegally gaining access to legitimate accounts or opening new accounts using false information... Such suspicious trading activities relate to allegations of fraud and therefore are not within the scope of the Rule 11890 Series.

Read together, FINRA Rule 11891 Supplementary Material .04 and FINRA Rule 11893 Supplementary Material .01's second rationale point form a coherent picture specific to the OTC equity market: a meaningful proportion of what might, on its face, appear to be an "obvious error" in an OTC equity security's price — the kind of anomaly that FINRA Rule 11891's core definition would, taken in isolation, seem to capture — may in fact reflect manipulative or fraudulent conduct (the kind of conduct FINRA Rule 11891 Supplementary Material .04 places outside the Rule 11890 Series' scope entirely) rather than a genuine systems problem or extraordinary market event of the kind the Rule 11890 Series is designed to remedy. Because the OTC equity market is, per Supplementary Material .01, disproportionately prone to this issues-other-than-systems-problems-or-extraordinary-events category relative to the exchange-listed market, FINRA's clearly erroneous authority — which Supplementary Material .04 confirms is simply the wrong tool for fraud-related aberrant trading regardless of market — correspondingly has narrower practical application to OTC equity securities than to exchange-listed securities, where aberrant trading is comparatively more likely to stem from the systems problems and extraordinary events the Rule 11890 Series does address.

The final sentence states the resulting practical expectation in direct terms — as a result, in the vast majority of situations relating to OTC Equity Securities, FINRA does not expect to use its clearly erroneous authority; rather, FINRA expects the parties to settle any dispute privately. This private-settlement expectation represents perhaps the most significant practical takeaway from FINRA Rule 11893 as a whole — for the overwhelming majority of disputes regarding the terms of an OTC equity security transaction, the elaborate FINRA-officer-review-and-UPC-Committee-appeal framework this dictionary has examined throughout FINRA Rules 11891 through 11893 (and will examine further in connection with FINRA Rule 11894) is not, as a practical matter, the mechanism through which such disputes are expected to be resolved — that mechanism is private negotiation and settlement between the parties themselves, with FINRA's formal clearly erroneous authority reserved for the comparatively rare extraordinary-event scenario Supplementary Material .01's first sentence describes.

The Amendment History: Two Same-Day 2010 Filings and the 2024 T+1 Connection

FINRA Rule 11893's amendment history — Adopted by SR-FINRA-2009-068, effective February 15, 2010, amended by SR-FINRA-2010-002, also effective February 15, 2010, SR-FINRA-2015-034 effective December 20, 2015, and SR-FINRA-2023-017 effective May 28, 2024 — presents a notable feature this dictionary has not previously encountered: two separate rule filings (SR-FINRA-2009-068 and SR-FINRA-2010-002) both becoming effective on the identical date, February 15, 2010. This dual-simultaneous-effective-date pattern recalls, though is structurally distinct from, the dual-filing-same-date pattern this dictionary observed for FINRA Rules 11100, 11560, and 11574 (each amended by both SR-FINRA-2010-030 and SR-FINRA-2010-060, both effective December 15, 2010) — there, two filings amended an existing rule on the same date; here, one filing adopted FINRA Rule 11893 and a second filing amended it, both effective the same day, suggesting FINRA Rule 11893's initial adoption and an immediate first amendment were coordinated to take effect simultaneously.

This February 15, 2010 origin also directly connects to FINRA Rule 11891's most recent amendment — SR-FINRA-2009-068 effective February 15, 2010 — confirming that FINRA Rule 11891's most recent amendment and FINRA Rule 11893's original adoption were part of the same coordinated filing (SR-FINRA-2009-068), consistent with both rules sharing Notice 10-04 (the January 15, 2010 "SEC Approves Consolidated FINRA Rules Governing Clearly Erroneous Transactions" notice this dictionary has now traced across FINRA Rules 11890, 11891, 11892, and 11893).

The SR-FINRA-2023-017 effective May 28, 2024 amendment — sharing Notice 24-04 with FINRA Rules 11140, 11150, 11210, 11320, 11620, and 11860 — represents FINRA Rule 11893's most recent refinement, and stands in contrast to FINRA Rule 11892's most recent amendment (SR-FINRA-2022-027 effective October 1, 2022), which predates the T+1 transition. This dictionary cannot, from its confirmed sources, identify the specific substantive content of FINRA Rule 11893's May 2024 amendment, but notes the confirmed fact that FINRA Rule 11893 — unlike FINRA Rule 11892 — was revisited as part of the broader T+1 settlement cycle conformity initiative, an initiative this dictionary has now traced across seven distinct 11000-series provisions (FINRA Rules 11140, 11150, 11210, 11320, 11620, 11860, and now 11893).

Connection to FINRA Rules 6420, 11110, 11140, 11150, 11210, 11320, 11620, 11860, 11890, 11891, 11892, and 11894

FINRA Rule 11893 connects directly and for the first time in this dictionary's coverage to FINRA Rule 6420 — the 6400 Series OTC equity quotation and trading provision whose definition of "OTC Equity Security" FINRA Rule 11893(c) incorporates, narrowed by the exclusion of exchange-traded equity securities to maintain mutual exclusivity with FINRA Rule 11892's scope. It connects to FINRA Rule 11110 — the UPC Committee framework underlying FINRA Rule 11894's review mechanism, which both FINRA Rule 11892(a)(2) and FINRA Rule 11893(a) invoke for appeals. It connects to FINRA Rules 11140, 11150, 11210, 11320, 11620, and 11860 — sharing Notice 24-04 and the SR-FINRA-2023-017 T+1 conformity amendment effective May 28, 2024, the seventh provision in this dictionary's coverage to bear this connection.

It connects to FINRA Rule 11890 — sharing Notice 10-04 as a directly-displayed selected notice, and as the parent series marker for the cluster FINRA Rule 11893 belongs to. It connects directly and extensively to FINRA Rule 11891 — sharing the core "clearly erroneous" definition FINRA Rule 11893(a) invokes, sharing the February 15, 2010 SR-FINRA-2009-068 origin date, and with Supplementary Material .01's limited-application rationale building directly on FINRA Rule 11891 Supplementary Material .03's extraordinary-market-conditions framing and Supplementary Material .04's account-intrusion/fraud-exclusion principle. It connects extensively and structurally to FINRA Rule 11892 — sharing the FINRA officer authority framework, the null-and-void grounds, the Additional Factors list (in substantially identical form), and the unusual-circumstances vocabulary underlying both rules' Alternative/exception Reference Price provisions, while differing in timing standard (single deadline versus dual 30-minute/extraordinary-circumstances standard), Numerical Guidelines table structure (seven tiers, three of them range-smoothed, versus three flat tiers, and the corresponding absence of LULD Plan integration), default Reference Price formulation (prevailing market price just prior to the trade versus consolidated last sale immediately prior), and — most fundamentally — the overall policy posture toward exercising this authority (FINRA Rule 11892's comprehensive, frequently-invoked LULD-integrated framework versus FINRA Rule 11893's exceptional, rarely-invoked, private-settlement-favoring framework). And it connects to FINRA Rule 11894 — the final rule of the cluster and of the entire FINRA Rule 11800 subsection, providing the UPC Committee review mechanism both FINRA Rule 11892 and FINRA Rule 11893 reference.

Notifying Each Party When an OTC Equity Transaction Is Declared Null and Void

When a FINRA officer declares a transaction in an OTC Equity Security null and void under FINRA Rule 11893(a), the rule says who must be told and how quickly. Each party involved in the transaction shall be notified as soon as practicable by FINRA. The duty to notify is FINRA's, and it runs to every party involved in the transaction.

Suppose Member A sells 5,000 shares of an OTC Equity Security to Member B at a price far above the prevailing market, and a FINRA officer declares the trade null and void. Member A loses a sale at a price it would gladly have kept, and Member B is released from a purchase it would gladly be rid of. Both are parties involved in the transaction, so FINRA must notify both of them, Member B as well as Member A, and must do so as soon as practicable. The notification requirement does not depend on which party gains or loses from the nullification.

The Committee's Deadline on an OTC Equity Appeal: A Worked Timeline

An appeal from a FINRA officer's determination under FINRA Rule 11893 to declare a transaction null and void goes to the UPC Committee under FINRA Rule 11894. The appeal must be made in writing and must be received by FINRA within thirty minutes after the person making the appeal is given the notification of the determination. For appeals regarding OTC Equity Securities, the Committee's determination will be rendered as soon as practicable, but in no case later than the trading day following the date of the execution(s) under review.

Suppose a trade in an OTC Equity Security executes on a Monday afternoon, and Monday, Tuesday and Wednesday are all trading days. A FINRA officer declares the trade null and void early on Tuesday, before the start of trading that day. On Tuesday, FINRA receives the aggrieved member's written appeal within thirty minutes of its notification. The Committee's outer limit is fixed by the date of the execution under review, Monday, and not by the date of the officer's determination or of the appeal, both Tuesday. So the Committee must render its determination as soon as practicable and in no case later than Tuesday, the trading day following Monday. It does not have until Wednesday.

Measuring Distance from the Reference Price in Either Direction

FINRA Rule 11893(b)(1) asks whether the execution price of the transaction is away from the Reference Price by an amount that equals or exceeds the Numerical Guideline. The test is stated as a distance from the Reference Price. The rule's text does not say that a purchase must have printed above the Reference Price, or a sale below it.

Suppose an OTC Equity Security has a Reference Price of forty dollars, in the tier from five dollars up to and including seventy-four dollars and ninety-nine and ninety-nine hundredths cents, where the Numerical Guideline is 10%. A member buys shares at thirty-five dollars, below the Reference Price, because the seller entered its price in error. The execution price is five dollars away from the Reference Price, which is 12.5%. That equals or exceeds the 10% guideline, so the trade meets the numerical threshold even though the buyer paid less, not more, than the Reference Price. Meeting the threshold is the condition without which the rule allows no finding, not a finding in itself; whether the trade is found clearly erroneous remains for the FINRA officer to determine.

Examination Relevance and Key Takeaways

FINRA Rule 11893 is the clearly erroneous transaction framework for OTC Equity Securities — structurally parallel to FINRA Rule 11892 in its FINRA officer authority, null-and-void grounds, and Additional Factors, but governed by a substantially narrower application policy and built around a distinct Numerical Guidelines structure.

The key points to retain are these:

FINRA Rule 11893(a) authorizes an Executive Vice President of FINRA's Market Regulation or Transparency Services Department (or designee) to review OTC Equity Security transactions on his or her own motion and declare them null and void if clearly erroneous or necessary for fair-and-orderly-market and investor-protection purposes, acting as soon as possible but in all cases no later than the start of trading on the day following the transaction, with FINRA Rule 11894 appeal rights except where the number of affected transactions makes immediate finality necessary; FINRA Rule 11893(b)(1) establishes a seven-tier Numerical Guidelines table running from 20% (under one dollar) down to 3% (over one thousand dollars), with three range-based tiers (from one dollar to four dollars and ninety-nine and ninety-nine hundredths cents, from seventy-five dollars to one hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents, and from five hundred dollars to nine hundred ninety-nine dollars and ninety-nine and ninety-nine hundredths cents) that smooth the percentage threshold from the higher tier's value at the range's low end to the lower tier's value at the range's high end, avoiding discontinuous jumps at tier boundaries — with the default Reference Price being the prevailing market price just prior to the time of the trade, a formulation somewhat broader than FINRA Rule 11892's consolidated-last-sale anchor, reflecting the comparatively thinner trading of many OTC equity securities; FINRA Rule 11893(b)(2) permits Alternative Reference Prices (consolidated inside price, opening price, prior close, or last sale prior to a series of executions) in unusual circumstances — extreme volatility, sustained illiquidity, or widespread system issues — paralleling FINRA Rule 11892(c)(3)'s closely similar vocabulary; FINRA Rule 11893(b)(3) provides an Additional Factors list essentially identical to FINRA Rule 11892's; FINRA Rule 11893(c) defines "OTC Equity Security" by reference to FINRA Rule 6420, excluding any exchange-traded equity security to maintain mutual exclusivity with FINRA Rule 11892's scope; and Supplementary Material .01 establishes that FINRA's clearly erroneous authority over OTC equity securities is exercised only in very limited circumstances — historically, extraordinary events with material market effects — given both the OTC market's lack of listing-driven information flows and the tendency of aberrant OTC trading to stem from fraud-related issues (connecting directly to FINRA Rule 11891 Supplementary Material .04's account-intrusion exclusion) rather than systems problems, with FINRA generally expecting the parties to settle disputes privately rather than invoking this authority. The rule was most recently amended effective May 28, 2024 through SR-FINRA-2023-017 (the seventh 11000-series provision in this dictionary's coverage to bear the T+1 conformity amendment), with prior amendments by SR-FINRA-2015-034 effective December 20, 2015, and both its adoption by SR-FINRA-2009-068 and amendment by SR-FINRA-2010-002, both effective February 15, 2010, with three selected notices — 10-04, 16-04, and 24-04.

FINRA Rule 11893