Cboe's 270-Day Quote Clock: A $5 Limit Near Expiry, $15 Beyond

Cboe's 270-Day Quote Clock: A $5 Limit Near Expiry, $15 Beyond

A quote can look tradable and still say very little about the price an order will receive. Cboe's August rule filing puts a hard number on that difference. For a market maker's electronic quote, the proposed maximum width would be $5 when the option expires in 270 days or less, then $15 for an option expiring later. The filing is a change in the exchange's market-maker rule, not a promise of a midpoint execution.

Friday, 21 August 2026, was the latest completed U.S. options session when this article was prepared on Sunday, 23 August. The timely development is Cboe's 17 August filing, SR-CBOE-2026-074, which is listed by the exchange under approved and immediately effective rule changes. Its own text separates that status from when the new requirements would become operative and implemented.

The result is a useful test for any long-dated option quote: a legal width limit is an outer boundary on one class of participant's quote. It is not the option's fair value, the national best bid or offer, or an instruction to accept a displayed price.

Observed facts: a proposed cap gains a 270-day tier

Cboe Rule 5.52 currently requires a market maker that enters one side of a quote in an appointed class to enter the other side. The current rule text does not set a general bid-ask differential for those electronic quotes.

SR-CBOE-2026-074 would add a general quote-width limit in two tiers.

The filing also says Cboe may set another differential for particular series or classes. For in-the-money series, the proposed differential would not apply when the underlying security's national best bid and offer is wider than the stated limit. In that case, the option quote may be as wide as that underlying-security NBBO.

Those are rule terms. They do not identify a specific expiration, strike, option price, displayed size or executed customer order from Friday's session.

The filing has three clocks, not one

The exchange's filing index labels SR-CBOE-2026-074 as approved and immediately effective. The document says Cboe filed it for immediate effectiveness, yet it also states that, by its terms, the change does not become operative until 30 days after filing unless the SEC designates a shorter period. Cboe says it will announce the implementation date through an Exchange Notice no later than 90 days after the operative date.

That wording creates three separate checkpoints.

1. Cboe's internal approval and the filing are dated 17 August 2026.
2. The filing describes effectiveness on filing, with a default 30-day operative delay unless the SEC acts sooner.
3. The exchange will announce the implementation date by Exchange Notice within the stated outer window.

Calling the $5 and $15 bands a live observation before the implementation date would overstate the document. The immediate question is whether a particular quote was displayed after the exchange implemented the rule, not whether the filing carries a familiar word such as "effective."

A width cap is a fence, not a price tag

A child can picture the rule as a limit on the gap between two fence posts. The bid is one post and the offer is the other. A $5 or $15 cap limits the distance between them for the specified market-maker quote. It does not say where the fence sits, how much is available at either post or whether a passing order receives a price between them.

The 270-day line is a compliance tier, not a valuation model. Longer-dated options often have less immediate trading interest and more uncertainty in their inputs. The filing allocates a wider permissible maximum to a series that has more than 270 days remaining, without forecasting its price or activity.

Model output: the long-dated band is three times wider

The filing's two proposed limits yield a short calculation.

$15 / $5 = 3

The proposed maximum width beyond 270 days is three times the maximum for the nearer series. That is arithmetic applied to a regulatory parameter. It is not a claim that every long-dated option will trade three times wider, nor an estimate of a contract's value, implied volatility or execution cost.

The filing supplies a second, more practical calculation. It would measure compliance at the market-maker firm's Trading Permit Holder level by aggregating quotes across its Executing Firm IDs, or EFIDs. Cboe gives an example in which EFID A quotes a $0 bid and a $10 offer, while EFID B quotes a $5 bid and a $15 offer in the same series. The aggregate firm quote is $5 bid and $10 offer, a $5 width.

This is an observed example from the filing and a calculated difference between its bid and offer fields. It describes Cboe's proposed compliance measurement. It does not establish the NBBO at any moment, quote size, order priority, the party on the other side of a customer order or a fill price.

What the limit does not cover

Rule 5.52 addresses electronic quotes from Cboe market makers in their appointed classes. The proposed band is not a universal $5 or $15 ceiling across every U.S. options venue, every participant's order or every complex strategy. Its in-the-money exception also links the allowable option width to a wider underlying-security NBBO in the stated circumstance.

That scope matters most when a screen presents an attractive midpoint. A midpoint is calculated from the visible bid and ask. It becomes an execution price only if an order meets available interest under the market's rules. Cboe's liquidity and bid-ask-spread lesson makes the same distinction, while its options-chain guide keeps the current bid, ask and displayed size ahead of a stale last trade. Open interest versus volume adds a separate warning: activity counts do not supply a fill price.

OMP's recent note on Cboe table scope offers a useful discipline here. A label must travel with its venue, timestamp and fields. The proposed Cboe differential is a venue-specific market-maker obligation. It should not be stretched into an all-market liquidity statistic or a conclusion from the index and equity put/call ratio.

The record to keep beside a long-dated quote

Options involve loss, liquidity, transaction-cost, tax, exercise and assignment considerations. This material is general education, not personal financial, legal or tax advice or a recommendation to buy, sell or hold an option or security.

For a research record, put the actual option's venue, quote timestamp, expiration, bid, ask, displayed size and order terms beside the applicable rule status. Treat the $5 or $15 figure as a boundary check only after confirming that Cboe has implemented the filing and that the quote falls within its scope. That decision rule keeps an exchange obligation, a model midpoint and an executable order in their proper lanes.

Sources

• Cboe filing SR-CBOE-2026-074, dated 17 August 2026
• Cboe Options Exchange Rule Filings, checked 23 August 2026
• Cboe Options Exchange Rule Book, Rule 5.52, checked 23 August 2026