A closing-auction order is usually rejected for one of three reasons: it reached the market after that venue’s cut-off, its price fell outside the permitted auction band, or it violated an order-type, amendment, participant, or risk rule. The exchange and your broker apply their own controls, so an order accepted in one market can be rejected in another.
To find the actual cause, identify the exchange and session, distinguish the order type (such as market-on-close or limit-on-close), check the cut-off in the exchange’s time zone, compare your limit with the current auction band, and read the broker’s rejection code. The examples below reflect exchange documentation available on 20 October 2026; cut-offs and parameters can change.
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What a closing auction does
A closing auction collects orders and matches them at one price intended to maximize executable volume at the end of the regular session. Instead of trading continuously at every incoming price, the venue builds an order imbalance, publishes information under its rules, and then calculates a single closing price. Orders that do not satisfy the venue’s timing, price, or eligibility tests never reach that match.
The labels differ by market. A market-on-close (MOC) order asks for execution at the official closing price without specifying a limit. A limit-on-close (LOC) order adds a worst acceptable price: a buy will not execute above its limit and a sell will not execute below it. Some venues use “at-auction” and “at-auction limit” terminology instead. A broker may expose a simplified label that maps to one of these exchange-native types, so the ticket description and the exchange rejection message can use different words.
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The three most common rejection causes
1. The order missed the entry cut-off
Closing auctions have a final time for entering MOC or LOC orders. An order submitted after that time may be rejected outright, queued for a different session, or treated as an ordinary-session order, depending on the venue. Amendments and cancel/replace requests can have a separate deadline, and some markets prohibit cancellation during a final no-cancel or random-close interval.
2. The limit price was outside the auction band
An auction limit is not always permitted at any price you type. The venue can define a dynamic band around a reference price, reject prices that would create an excessive deviation, or tighten the allowable range as the auction progresses. A limit that was valid earlier can therefore become invalid later.
3. A broker or participant rule failed
Broker gateways validate orders before forwarding them. They may enforce the exchange’s tick size, quantity, price-deviation, account, short-selling, settlement, or session rules, plus their own risk limits. The exchange can also reject an order after the broker accepts it. A generic “rejected” status does not identify which layer failed; the detailed code or parameter is needed.
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Never use a generic “market close” time as the closing-auction deadline. The following published examples illustrate how different the rules can be.
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| Venue or market | Published rule | Practical consequence |
|---|---|---|
| NYSE | MOC/LOC order-entry cut-off is 3:50 p.m. Eastern; imbalance publication starts at that time. | An order entered after 3:50 p.m. Eastern is not a normal late entry for the closing auction. Confirm whether the broker supports any separate late-order handling. |
| Cboe | MOC orders must arrive before 3:55 p.m. for guaranteed closing-auction eligibility. LOC orders received after 3:59 p.m. are rejected. | “Before 3:55” and “after 3:59” are different rules for different order types. A LOC sent at 4:00 p.m. is explicitly rejected. |
| Borsa Italiana | The closing auction is scheduled from 17:30 to 17:35, followed by a random extension of up to 30 seconds. | The exact end cannot be assumed from the displayed 17:35 time. A submission or amendment during the random extension may be disallowed by the session rules. |
The times above are local to the named venue. Convert them to the time zone shown by your broker, account for daylight-saving changes, and allow for the broker’s transmission and risk checks. A ticket stamped before the exchange deadline can still arrive too late if the broker submits it after its own internal cut-off.
How price bands can reject a valid-looking limit
HKEX: a two-stage permissible band
Hong Kong Exchanges and Clearing applies a clear example of a moving auction band. During the Order Input Period, the initial permissible range is plus or minus 5% from a reference price. At the end of that period, the band tightens to the lowest ask and highest bid recorded at that point. During the Closing Auction Session, an at-auction limit order outside the applicable permissible price limit is rejected by the trading system.
This means a limit price can pass an initial check yet fail after the reference range tightens. It also means that a buy limit set well above the market, or a sell limit set well below it, is not merely unlikely to execute; it can be ineligible. The relevant reference, the stage of the auction, and the side of the book all matter.
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Borsa Istanbul: closing-session margin and daily limits
Borsa Istanbul illustrates why percentages cannot be generalized across markets. It applies a plus or minus 3% margin in the closing session, while entry outside the instrument’s daily plus or minus 20% price limits remains prohibited. The 3% closing-session margin is therefore an additional closing-auction constraint, not a replacement for the broader daily limit.
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Why the displayed reference may change
Venues can calculate a reference from the prior close, a last traded price, an indicative auction price, or book prices captured at a defined stage. Your platform may show an indicative price that moves as orders arrive, while the exchange validates against a frozen or stage-specific value. If a rejection cites “price deviation,” “outside band,” or “invalid price,” compare the order with the venue’s current or frozen reference rather than with the last price you remember seeing.
Order types that are easy to confuse
Market-on-close (MOC)
An MOC order does not specify a maximum buy or minimum sell price. It is generally eligible only if entered before the venue’s MOC deadline. Because execution depends on the auction’s resulting price and available liquidity, the order can be accepted but receive a partial fill or no fill under the venue’s matching rules; acceptance is not a guarantee of execution.
Limit-on-close (LOC)
An LOC order adds a price constraint. It can be rejected for arriving after the LOC deadline, for using a price outside the permitted band, or for violating a tick-size or price-format rule. If accepted but the closing price is worse than your limit, it normally remains unexecuted rather than filling at an unacceptable price.
At-auction and at-auction limit
These terms are common in non-U.S. markets. An at-auction order is generally market-like within the auction, while an at-auction limit order carries a boundary. HKEX explicitly states that an at-auction limit order entered during its Closing Auction Session with a limit outside the permissible price limit is rejected. Do not assume that an “auction” button on one platform has the same behavior as an “auction” button on another.
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Can a broker reject an order the exchange would accept?
Yes. A broker can reject an order before sending it to the venue because its gateway applies additional controls or cannot support the requested combination of symbol, session, order type, account, and time-in-force. The broker may also use a stricter internal cut-off to leave time for validation, routing, and confirmations. Conversely, a broker can accept the ticket and then report an exchange rejection after the venue checks it.
Moscow Exchange describes this layered enforcement directly: exceeding order-parameter limits entails automatic rejection by the Trading System, and those limits vary by security, trading mode, and participant category. The same principle applies broadly: quantity increments, maximum order size, price precision, client classification, and permitted order types can differ by instrument and participant.
Ask whether the status was generated by the broker gateway or by the exchange. Request the original venue code, the failed parameter, and the timestamp at which the venue received the order. “Outside price range,” “session closed,” “order type not allowed,” and “cancel/replace not permitted” point to different remedies.
A step-by-step way to diagnose the rejection
- Identify the exact market. Record the exchange, listing, country, security identifier, and trading session shown in the ticket. A dual-listed security can have different auction rules on each venue.
- Classify the order. Determine whether it was MOC, LOC, at-auction, at-auction limit, or a broker-specific equivalent. Also record side, quantity, limit, time-in-force, and any “reduce only” or short-sale setting.
- Reconstruct the timestamps. Note when you entered, amended, or canceled the order and when the broker says it forwarded it. Convert every time to the exchange’s local time, including daylight-saving status.
- Check the entry and amendment deadline. Compare the venue’s rule for that order type with the exchange-received timestamp, not just the time you clicked Submit. For NYSE, the published MOC/LOC entry cut-off is 3:50 p.m. Eastern. For Cboe, MOC eligibility is tied to arrival before 3:55 p.m., while LOC orders after 3:59 p.m. are rejected.
- Check whether the auction was in a no-cancel or random-close phase. A cancellation or replacement can be rejected even when a new order would have been accepted earlier. Borsa Italiana’s random extension of up to 30 seconds is an example of why the visible scheduled end is not always the actual end.
- Compare the price with the correct band. Use the venue’s reference and the auction stage. For HKEX, test against the initial plus or minus 5% Order Input Period range and then the tightened range based on the lowest ask and highest bid recorded at the end of that period.
- Validate format and parameters. Check tick size, decimal places, minimum and maximum quantity, lot size, allowed time-in-force, account permissions, and security-specific limits. Moscow Exchange notes that these parameters vary by security, trading mode, and participant category.
- Match the rejection code to the rule. Save the complete message, code, and timestamp. If the message is ambiguous, ask the broker for the venue rule ID or exact parameter that failed rather than relying on a generic “closing price” explanation.
Common scenarios and the correct fix
“I entered an MOC order at the close and it was rejected.”
The most likely issue is a missed cut-off. The fact that continuous trading was still open does not extend the MOC window. Check the venue’s MOC deadline and the broker’s earlier internal deadline. If the cut-off has passed, the practical remedy is usually to wait for the next eligible session or use an order type the venue explicitly permits, not to keep resubmitting the same MOC ticket.
“My LOC price was close to the market, but the system said price deviation.”
Check the auction-stage band, not only the last traded price. A tightening rule such as HKEX’s can make a previously acceptable limit ineligible. Recalculate using the permitted reference, adjust the limit only if doing so remains consistent with your trading objective, and verify the tick size.
“The broker accepted my order, then showed an exchange rejection.”
Request the exchange acknowledgment and rejection code. The broker’s front end may have validated syntax while the venue rejected the order for a session, band, participant, or instrument rule. The exchange timestamp is decisive for a cut-off dispute.
“The order disappeared during the last seconds of the auction.”
It may have been canceled by a failed replace request, a random close, or a venue rule that removes unexecuted orders at the end of the session. Ask whether the order was rejected, canceled, expired, or simply unexecuted; those statuses have different meanings and records.
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Comparing venues before you trade
| Rule to compare | Questions to answer | Why it matters |
|---|---|---|
| Entry cut-off | What is the exact deadline for MOC, LOC, and auction-limit orders, and in which time zone? | Continuous-session hours do not tell you when closing-auction entry ends. |
| Price-band method | Is the band fixed, percentage-based, reference-price-based, or tightened from book prices? | A limit can be valid at one stage and rejected at another. |
| Amendments and cancellations | Can you cancel or replace after entry? Is there a no-cancel interval? | A late change may be rejected even when the original order was valid. |
| Closing time | Is the close fixed or randomized within a final interval? | A displayed scheduled end may not be the actual matching moment. |
| Supported order types | Does the venue support MOC, LOC, at-auction, and at-auction limit for this security? | A broker label may map to an unsupported exchange type. |
| Participant limits | Do rules vary by security, trading mode, account, or participant category? | Institutional, retail, foreign, and sponsored access can face different parameters. |
| Rejection reporting | Will the broker show the exchange code, its own code, or only a plain-language message? | Without the source and failed parameter, troubleshooting is guesswork. |
How to prevent the next rejection
- Read the current exchange rule for the specific listing and auction session before placing the first order.
- Set a personal deadline several minutes before the official cut-off to allow for authentication, risk checks, and network delay.
- Confirm your device and broker display the exchange’s local time or a clearly converted equivalent.
- Use the exact supported order type; do not assume that “close,” “auction,” and “market-on-close” are interchangeable.
- For limit orders, check the permitted band, tick size, and decimal precision immediately before submission.
- Avoid unnecessary cancel/replace requests near the close, when amendment rights may be restricted.
- Save the order ticket, exchange-received timestamp, indicative auction data, and full rejection code.
- Test unfamiliar order types in a permitted practice or small-size workflow if your broker provides one, while recognizing that a test environment may not reproduce live auction rules.
What to ask your broker’s support team
Provide the symbol, venue, order type, side, quantity, limit price, account, entry and exchange timestamps, and the complete rejection text. Ask these specific questions:
- Was the rejection generated by the broker or by the exchange?
- What exact cut-off and time zone applied to this order type?
- Was the order entered, amended, or canceled during a restricted interval?
- Which reference price and price band were used?
- What venue rule ID or parameter failed?
- Was the order rejected, canceled, expired, partially executed, or accepted but unfilled?
- Would the same order be eligible in the next session, and what must change?
Those answers turn a vague “closing auction rejected” notice into a reproducible explanation. Because cut-offs, percentages, supported order types, and broker implementations can change, verify the current rulebook for the named venue each time the market publishes an update.
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