Try 10 focused Series 23 questions on Trading and Market Making, with explanations, then continue with the full Securities Prep practice test.
Series 23 Trading and Market Making questions help you isolate one part of the FINRA outline before returning to a mixed practice test. The questions below are original Securities Prep practice items aligned to this topic and are not copied from any exam sponsor.
| Item | Detail |
|---|---|
| Exam | FINRA Series 23 |
| Official topic | Function 4 — Supervision of Trading and Market Making Activities |
| Blueprint weighting | 28% |
| Questions on this page | 10 |
A general securities principal supervises an equity desk that makes markets in an NMS stock. The listing market declares a limit up-limit down trading pause, but one vendor feed used by the desk still shows the stock as open and traders can still attempt manual entries. Several customer orders are waiting, and the desk wants the least disruptive response that still meets supervisory obligations. What is the best immediate supervisory action?
Best answer: C
Explanation: A trading pause requires an immediate stop on desk activity in the affected symbol plus prompt verification, escalation, and documentation of the control failure.
When a LULD pause or similar market restriction applies, the desk must stop quoting and order entry in the affected security rather than rely on a delayed internal feed. The principal should verify status through an authoritative source, escalate the control issue, and document the response before trading activity resumes.
The core supervisory issue is that an external market restriction overrides the desk’s stale internal status display. Once the principal knows a LULD trading pause is in effect, the proper response is to immediately prevent quoting and order entry in that symbol, verify the restriction through an authoritative market-status source, and escalate the feed or system exception under the firm’s WSPs. That response addresses both market-conduct risk and the control failure that allowed attempted entries during a pause.
Customer interest can remain pending, but the desk should not keep entering quotes or routing orders into a paused market just because one vendor feed is delayed. A manual workaround is not a substitute for honoring the restriction. The key takeaway is that the principal must impose the stop, verify, escalate, and document right away rather than defer review.
Under a typical fully disclosed clearing arrangement, which activity is generally the responsibility of the carrying firm rather than the introducing firm?
Best answer: A
Explanation: The carrying firm typically performs the back-office clearance, custody, and recordkeeping functions tied to settlement and customer positions.
In a fully disclosed arrangement, the carrying firm usually handles the operational back-office functions of clearing and carrying customer accounts. The introducing firm generally remains responsible for front-end supervision, including account approval, sales practice oversight, and branch supervision.
The core distinction is that the introducing firm typically manages the customer relationship and supervises associated persons, while the carrying firm performs clearing and custody functions under the clearing agreement. In trade processing and clearance, the carrying firm commonly maintains customer securities and funds, processes settlement, and keeps the related custody and position records. By contrast, the introducing firm generally handles account opening review, suitability or Reg BI-related supervision, and oversight of representatives and branch activity. A good Series 23 shortcut is to separate customer-facing supervision from back-office clearance and custody. The closest distractors involve supervisory duties that usually remain with the introducing firm, even when another firm carries the accounts.
A firm’s WSPs do not require any principal check that current issuer information has been reviewed before traders publish priced quotations in non-exempt OTC equity securities. An inspection finds the desk has been entering two-sided quotations in a thinly traded penny stock on an interdealer quotation system with no file showing the required issuer-information review. What is the most likely immediate consequence?
Best answer: A
Explanation: Without documented support that the OTC security is eligible for a priced quotation, the firm should stop displaying the quotes.
The immediate issue is quotation eligibility, not trade cancellation or customer paperwork. If the firm cannot show the required issuer-information review for a non-exempt OTC penny stock, it should stop publishing the priced quotation until the condition is satisfied.
For non-exempt OTC equity securities, a firm must have a valid basis to publish a priced quotation, including the required review of current issuer information when applicable. In this scenario, the supervisory failure is that traders could enter two-sided OTC quotes without evidence that the review occurred. That makes the most immediate consequence operational and regulatory: the firm should withdraw the quotation rather than continue displaying it.
Completed trades are not automatically unwound just because quotation controls were deficient, and customer penny stock disclosures address a different obligation. CAT also concerns order-event reporting, not whether the firm was permitted to publish the OTC quote in the first place. The key takeaway is that a quotation-control gap first affects the firm’s ability to continue quoting the security.
A principal reviews a desk plan for a 1,200-share customer market buy order in NMS stock XYZ. The desk wants to execute the balance internally at $25.00. Assume each displayed offer below is a protected, automated quotation, and ignore any broader best-execution analysis.
Displayed offers
Under Regulation NMS order-protection, what is the minimum number of shares the desk must route away before filling the rest internally at $25.00?
Best answer: C
Explanation: Only the 300 shares at $24.98 and 200 shares at $24.99 are better-priced protected offers, so 500 shares must be routed before an internal fill at $25.00.
Order protection focuses on avoiding trade-throughs of better-priced protected quotations. Here, the desk must clear the shares offered below $25.00, which total 500 shares, but it does not have to route to the same-priced $25.00 offer just to satisfy Regulation NMS order-protection.
The core concept is the Regulation NMS Order Protection Rule: a desk may not execute at a price inferior to a better-priced protected quotation. Because the firm wants to fill internally at $25.00, it must first access all protected offers priced lower than $25.00.
That calculation is:
The 400 shares displayed at $25.00 are at the same price as the proposed internal execution, so they are not a trade-through issue for order-protection purposes. The 600 shares at $25.01 are worse-priced and therefore also do not have to be accessed first. The closest trap is treating same-priced liquidity as an order-protection requirement rather than a separate best-execution consideration.
During a principal’s weekly trade-reporting review, an exception report shows that several NMS equity orders routed by the firm’s smart order router were reported to CAT with the firm’s MPID as the executing venue, even though the router log shows the orders were sent to an ATS and executed there. On the same orders, the CAT route event timestamp is later than the execution event timestamp. Customer price and size are correct, and no complaints have been received.
Which action best aligns with a durable supervisory standard?
Best answer: A
Explanation: Mismatched venue, MPID, and event timing indicate an audit-trail control failure that requires correction and root-cause testing, not just trade-by-trade cleanup.
The issue is not customer execution quality alone; it is the integrity of the firm’s reporting and audit trail. When venue, MPID, and event timestamps do not align with the source records, the principal should reconcile the data, correct the reports, and address the control weakness that caused the mismatch.
This scenario points to a reporting-control breakdown. Accurate price and size do not cure inaccurate CAT data when the executing venue, MPID, and event sequencing are wrong. A principal should compare the firm’s source records across the order management system, router, and execution venue, submit needed corrections, and determine whether a mapping or interface problem caused the mismatch.
Reasonable supervision focuses on both remediation and prevention:
The closest distractor is the idea that correct customer fills make the issue immaterial, but audit-trail accuracy is itself a core supervisory obligation.
A firm’s WSPs require a principal to review unmatched trade comparisons, DK notices, and any changes to institutional block-trade allocations made after execution. Which supervisory obligation does this control primarily support?
Best answer: B
Explanation: These exceptions test whether executed trades were recorded correctly, compared successfully, and allocated to the proper accounts on a supportable basis.
This control is aimed at post-trade accuracy. Unmatched comparisons, DK notices, and late allocation changes are classic indicators of possible booking errors, compare breaks, or unsupported account allocations that require principal review.
Trade comparison and allocation controls are designed to ensure the firm’s books and records match the executed trade, the counterparty can compare the trade correctly, and block orders are allocated to the proper customer accounts on a timely and supportable basis. Unmatched trades and DK notices signal possible booking or comparison errors, while post-execution allocation changes raise supervisory concerns about accuracy, documentation, and fairness of the allocation process.
This is different from controls focused on routing quality, short sale compliance, or communications approval.
A general securities principal reviews a T+1 exception memo for a retail equities desk. Most items are routine: several institutional DKs were cured on trade date, and two street-side delivery fails are awaiting corrected depository instructions. One practice is different: when a representative enters the wrong retail account number, operations moves the executed trade to a different customer account after the original confirmation has been sent, and no corrected confirmation is issued if the price and quantity stay the same. What is the primary supervisory red flag?
Best answer: D
Explanation: Changing the customer allocation after a confirmation without issuing a corrected confirmation risks both inaccurate customer disclosure and weakened transaction finality.
The key risk is not the ordinary settlement noise; it is changing who the trade belongs to after the customer has already been sent a confirmation. That creates inaccurate customer records and undermines confidence that the confirmed transaction is final unless the firm issues a proper correction.
The core concept is that standard settlement exceptions, such as DKs cured quickly or delivery problems caused by bad instructions, are usually operational issues that can be resolved within normal post-trade processing. By contrast, reallocating an executed retail trade to a different customer account after the original confirmation has already been sent directly affects the accuracy of customer disclosures and the finality of the transaction record.
A principal should view this as the most serious red flag because the control failure is not just delayed settlement; it is allowing a completed, disclosed trade to be reassigned without sending corrected disclosure to the affected customer. The closest distractors describe normal settlement frictions, but those do not inherently mean the customer received an inaccurate final confirmation.
A principal reviews an exception report showing that a retail customer entered a limit order marked “Route only to Nasdaq; do not internalize.” The firm’s routing disclosure states that non-directed orders may be sent to the firm’s ATS for possible price improvement. The desk instead routed this order to the ATS and executed it there. Which supervisory response best matches these facts?
Best answer: B
Explanation: An explicit customer routing instruction overrides the firm’s default routing disclosure, so the principal must escalate the contrary execution immediately.
A firm’s general order-routing disclosure applies to non-directed orders, not to an order with a specific customer routing instruction. Because the desk executed the order contrary to that instruction, the principal should treat it as an immediate supervisory exception requiring investigation and possible remediation.
The core concept is that specific customer instructions control the handling of that order, even when the firm has disclosed a general routing practice for other orders. Here, the order was clearly marked as customer-directed and specifically prohibited internalization, yet the desk sent it to the firm’s ATS and executed it there. That creates an order-handling conflict that should be escalated promptly as a potential supervisory and conduct issue.
The principal should investigate the cause, preserve the review trail, assess whether other orders were affected, and consider customer remediation and control changes. A periodic best-execution review may later analyze the event, but it does not replace immediate escalation of a clear exception. The key takeaway is that disclosed default practices do not override explicit customer instructions.
An operations manager asks a Series 23 principal which pending settlement item can stay in normal clearance processing instead of being escalated as a special delivery exception. Which item would NOT usually require added principal attention before acceptance?
Best answer: B
Explanation: A routine book-entry delivery in the exact contracted amount through normal clearance is standard good delivery and does not present the special risks raised by irregular units, registered issues, or draft settlement.
Added principal attention is generally warranted when the delivery departs from ordinary good-delivery processing. Irregular units, registered certificates requiring assignment review, and delivery with draft each create extra settlement or transfer risk, while a standard book-entry delivery in the exact amount does not.
The key is whether the delivery presents a special good-delivery or settlement-control issue. Deliveries in irregular units can create rejection, denomination, or re-delivery problems. Registered securities require careful review of assignments, endorsements, and signature guarantees before acceptance because transfer errors can make the delivery defective. Delivery against a draft also changes the normal payment-and-delivery process, so firms typically give it added supervisory attention.
A book-entry bond delivery in the exact contracted amount through ordinary clearance is routine and fits normal settlement controls unless some other exception is present. The fact that the other choices involve nonstandard form, transfer review, or draft mechanics is what makes them escalation items.
A general securities principal is reviewing trade-reporting exceptions under the firm’s WSPs.
Exhibit:
WSP closure standard:
- Close an exception only after the corrected submission is accepted.
- Escalate repeated exceptions for trend review.
Exception summary:
OTC TRF | Late equity report | Corrected; accepted | 4th this month
TRACE | Bond price transposed | Corrected; accepted | Isolated
CAT | Customer acct type omitted | Resubmission pending | 3rd this week
Which action is most appropriate?
Best answer: D
Explanation: The CAT item is still unresolved because resubmission is pending, and both CAT and OTC TRF show repeated exceptions that the WSP requires to be escalated.
The exhibit says exceptions may be closed only after the corrected submission is accepted, so the CAT item remains open because its resubmission is still pending. The WSP also requires escalation of repeated exceptions, which applies to both the CAT pattern and the OTC TRF pattern, while the isolated corrected TRACE item may be closed.
The key supervisory point is that trade-reporting review is not complete when a problem is merely identified or a fix is started. A principal must confirm that a required correction was actually accepted, and must also escalate recurring reporting problems for trend review across venues.
Here, the TRACE item was corrected, accepted, and marked isolated, so it can be closed. The OTC TRF item was corrected and accepted, but it is the 4th similar event this month, so the pattern must be escalated even though that individual report was fixed. The CAT item is more urgent because the correction is not yet accepted; “resubmission pending” means the exception is still open, and it is also the 3rd similar event this week, so it also requires escalation.
A remediation note or vendor ticket alone does not satisfy the WSP closure standard.
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