An All-or-None Options Order Can Leave the Whole Position Open

An All-or-None Options Order Can Leave the Whole Position Open

In a fictional closing order, an investor wants to buy back six short puts. Only three contracts can trade immediately within the chosen limit. An all-or-none instruction refuses that partial close. If nothing fills, all six puts remain open, even though the order was intended to remove them.

All-or-none, abbreviated AON, controls whether the requested quantity may be partly executed. It does not by itself require immediate execution or cancellation. Fill-or-kill, or FOK, combines complete quantity with immediacy. Immediate-or-cancel, or IOC, accepts a partial immediate fill and cancels the balance. Those differences can leave the same starting position with very different remaining obligations.

Complete quantity and immediate completion are separate conditions

The Options Industry Council's AON definition requires an option order to execute completely or not at all. OIC says an AON order may have Day or good-'til-cancelled duration. A supported AON order can therefore keep waiting under its accepted duration rather than disappear because the first available quantity was too small.

OIC's FOK definition adds immediate cancellation when the entire quantity cannot be executed immediately. Its IOC definition permits partial execution, with the remaining quantity cancelled immediately. Neither FOK nor IOC is a persistent GTC instruction in these definitions.

These are educational definitions, not a list of choices guaranteed on every options ticket. Verify whether the broker supports the instruction for the exact product, order structure and trading session, and how it handles the instruction. An accepted Day AON order in the example below is an explicit assumption, not evidence about a particular broker or exchange.

FINRA's stock-order guide also distinguishes AON's quantity condition from FOK's immediacy. That guide concerns stocks. The option-specific definitions here come from OIC; a stock-order explanation does not establish options availability at a brokerage firm.

Six short puts, three different closing outcomes

Assume an account is short six standard, unadjusted U.S. equity puts on fictional Cedar shares. Every put has a $50 strike, the same future expiration, American-style exercise and physical share delivery. Each contract represents 100 shares, consistent with OCC's standard equity-option specifications. All dollar amounts are U.S. dollars.

The investor submits a buy-to-close limit of $0.80 per share for all six contracts. For this illustration, assume the broker accepts each instruction in the separate scenarios and only three contracts can execute immediately through the applicable route at $0.80 or less. Assume the IOC scenario fills those three at exactly $0.80. No other orders, assignments or contract adjustments intervene.

The available quantity is a stipulated execution condition, not an inference from a displayed quote. Quote size describes one displayed price level; other interest and changing quotes can produce different actual executions. Cedar, the prices, quantities and outcomes below are fictional. The scenarios are alternatives starting from the same six short puts, not three orders sent together.

• Accepted closing instruction: Day AON

  • Immediate execution in this example: No fill because all six cannot execute.
  • Order state afterwards: The accepted order remains working under its Day handling.
  • Short puts remaining: 6

• Accepted closing instruction: FOK

  • Immediate execution in this example: No fill because all six cannot execute immediately.
  • Order state afterwards: The order is cancelled.
  • Short puts remaining: 6

• Accepted closing instruction: IOC

  • Immediate execution in this example: Three contracts fill at $0.80.
  • Order state afterwards: The unfilled three-contract balance is cancelled.
  • Short puts remaining: 3

The IOC close costs 3 x 100 x $0.80 = $240 before commissions and other charges. If the Day AON order later filled all six contracts at the same price, it would cost 6 x 100 x $0.80 = $480. That later fill is possible only if the order is still active and the full quantity can execute under its accepted conditions. The example neither predicts it nor assumes that today's price stays available.

These amounts are gross closing debits, not trade losses. The original opening premium and all transaction costs would be needed to calculate profit or loss. A $0.80 buy limit constrains the option execution price; commissions or separately charged fees can make the total cash debit larger than the premium calculation.

A stricter fill condition can leave more risk unresolved

The AON and FOK outcomes leave six short puts. FINRA's assignment guidance explains that an open short American-style option can remain subject to assignment during its term. A closing intention does not remove that obligation.

If all six remaining $50 puts are assigned, the account must purchase 6 x 100 = 600 shares for 600 x $50 = $30,000, before applicable charges. After the illustrated IOC close, assignment of all three remaining puts would require 300 shares and $15,000. These are conditional gross share-purchase amounts, not assignment probabilities, broker margin requirements or estimates of investment loss. Partial assignment is also possible.

OCC's equity-option specifications describe standard equity-option exercise as producing share delivery on the next business day, T+1. Actual funding and broker deadlines still matter. Cash reserved for a short put does not protect against a falling share price; a put seller can suffer substantial losses if the underlying falls. The exercise-versus-assignment lesson explains the contract obligations separately from the order instruction.

AON can be unsuitable for an investor whose objective requires promptly reducing at least some exposure, because it refuses partial execution. IOC can be unsuitable when a partially completed quantity would itself defeat the objective. FOK can leave the entire original position unchanged when its immediate full-fill condition fails. None of these instructions supplies liquidity, protects the remaining options from losses or determines which choice suits a particular investor.

Read the accepted order alongside the remaining position

The order ticket needs separate price, quantity and duration fields. AON answers the quantity question. A limit answers the execution-price question. The accepted time instruction and broker handling determine how long an unfilled order can continue. Order duration and contract expiration explain those separate clocks.

This example concerns six contracts of one series. A multi-leg order introduces another condition: the relationship among its legs. A ratio-preserving partial complex fill can complete a smaller number of spread units while retaining the intended leg ratio. AON quantity handling and complex-order ratio handling should not be treated as interchangeable.

Before treating a close as complete, match the accepted instruction, actual filled quantity, working or cancelled balance, and current contract position. If an AON order is still working, a request to cancel it needs its own confirmed outcome before a separate order can safely be assumed to replace it. The cancellation-status explanation covers that reconciliation problem.

Costs, liquidity and market changes remain relevant whichever instruction is accepted. OIC's trade-entry discussion explains how available prices and quantities affect execution. The OMP liquidity lesson provides the foundation. Actual commissions, fees, tax treatment, collateral rules and assignment processing are account-specific; none was tested in this example. Count the contracts that actually closed, then assess the obligations on the contracts still open.

Sources and scope

Sources checked 15 October 2026, Australia/Brisbane: OIC's AON, FOK, IOC and trade-entry explanations; FINRA's stock-order qualifiers and option-assignment guidance; and OCC's equity-option specifications and options disclosure gateway. The example is author arithmetic and excludes fees, taxes, financing, price changes, intervening assignment and adjusted deliverables. It establishes no live quote, trade outcome or broker policy.

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