Cboe Overhauls Binary Options Rules for Fairer Gambles
Published Date: 4/20/2026
Notice
Summary
Cboe Exchange is updating its rules for binary options, which are special bets that pay out all or nothing based on a simple yes-or-no outcome. These changes affect traders using Cboe’s platform and aim to make trading clearer and fairer. The new rules were proposed in April 2026 and could impact how and when payouts happen, so traders should pay attention!
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Analyzed Economic Effects
8 provisions identified: 4 benefits, 2 costs, 2 mixed.
New Per-Expiration Position Limits
The Exchange proposes position limits for binary options applied on a per-expiration basis. If traditional options on the same index have no position limit, the limit would be 15,000 contracts times the ratio of 10,000 to the exercise settlement amount per expiration. If traditional options on the same index do have position limits, the per-expiration number of contracts is set by market-capitalization-ratio tiers (e.g., >=0.50 → 10,000; <0.50 ≥0.25 → 5,000; <0.25 ≥0.10 → 2,500; <0.10 ≥0.005 → 1,500; <0.005 ≥0.0025 → 1,000; <0.0025 → 500), multiplied by the ratio of 10,000 to the exercise settlement amount.
Binary Options on More Indexes
If you trade binary options on Cboe, the Exchange proposes to permit listing binary options on any index that satisfies the Exchange's Rule 4.10 listing criteria (instead of only on broad-based indexes). This proposed rule change was filed April 2, 2026 and would expand the types of indexes that can underlie exchange-listed binary options.
A.M. and P.M. Settlement Allowed
The Exchange proposes that binary options may be designated as A.M.-settled or P.M.-settled for all eligible indexes. This change would allow Cboe to list both A.M.- and P.M.-settled binary index options across the expanded set of indexes.
Higher Limits for Hedged Positions
The proposal allows increased position limits for qualifying hedged binary option positions: up to five times the standard position limit if the index market-capitalization ratio is ≥ 0.005, or up to three times if the ratio is < 0.005. Qualifying hedges include being covered by cash equal to the exercise settlement amount, covered by related securities sufficient to meet settlement, or hedged with traditional options covering the same index.
Margin and Cash-Coverage Requirements
Margin rules in Rule 10.3(m) would apply to all binary options: for margin accounts, long binary options require initial and maintenance margin equal to 100% of the purchase price (premium) and short binary options require margin equal to the exercise settlement amount. For cash accounts, a short binary option must be covered by either (1) cash/cash equivalents equal to 100% of the exercise settlement amount, (2) a long binary option of the same type paid in full with specified strike/expiry conditions, or (3) an escrow agreement certifying qualified collateral with aggregate market value of at least 100% of the exercise settlement amount.
Shorter Last-Day Trading Window
On their last trading day, expiring P.M.-settled binary index options would have regular trading hours (RTH) between 9:30 a.m. and 4:00 p.m. Eastern Time (instead of 9:30 a.m. to 4:15 p.m.). This change applies to the proposed P.M.-settled binary index options.
Aggregation, Exercise, and Exercise Limits
Under the proposal, positions in binary options on the same index with different exercise settlement amounts will be aggregated for reporting; binary options will not be aggregated with non-binary option contracts on the same or similar underlying. Binary options are European-style, automatically exercised at expiration if the settlement value meets the exercise condition, and are not subject to exercise limits under Rule 8.42(h).
Expiration Range and Minimum Quote Size
Binary option series may be listed with expirations from one day up to 36 months, and quotes will use existing strike intervals for traditional index options with minimum price variations by class of no less than $0.01.
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