Cboe Overhauls Binary Options Rules: High Stakes Get Tweaked
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 could start soon and might impact how much money traders can win or lose.
Analyzed Economic Effects
10 provisions identified: 5 benefits, 4 costs, 1 mixed.
Binary Options Allowed on Any Index
Cboe proposes to let binary options be listed on any index that meets Rule 4.10 listing criteria, not just broad-based indexes. This change would expand the types of index-based binary contracts available to investors on the Exchange.
AM and PM Settlement for All Binary Options
The Exchange would permit binary options to be designated as A.M.-settled or P.M.-settled for all eligible indexes. This gives investors flexibility to choose series that settle at the open (A.M.) or at the close (P.M.).
Position Limits Set Per Expiration with New Table
The proposal applies position limits to binary options on all eligible indexes on a per-expiration basis, using fixed contract counts tied to the index's market capitalization ratio. For indexes where traditional options have no position limit, the limit is 15,000 contracts times the ratio of 10,000 to the exercise settlement amount per expiration; otherwise the table sets limits from 10,000 down to 500 contracts depending on market capitalization ratio.
Higher Limits for Qualified Hedged Positions
Certain qualified hedged strategies may have larger position limits: hedged positions equal five times the standard position limit if the index market capitalization ratio is >= 0.005, or three times the standard limit if the ratio is < 0.005. Qualifying hedges include being fully covered by cash, a sufficient related security, or a traditional option covering the same index.
Margin Rules Require Full Funding for Binary Positions
Margin rules apply to all binary options: in a margin account, long binary options require initial and maintenance margin equal to 100% of the purchase price; short binary options require margin equal to the exercise settlement amount. In a cash account, a short binary option must be covered by 100% cash, a qualifying long binary option, or an escrow agreement.
Last Trading Day Ends at 4:00 PM for P.M.-Settled Binaries
On the last trading day, RTH for expiring P.M.-settled binary index options may be effected between 9:30 a.m. and 4:00 p.m. Eastern Time (not until 4:15 p.m.). This shortens the trading window for expiring P.M.-settled binary index options by 15 minutes on expiration days.
Position Limits Scale by Exercise Settlement Amount
Position limits will be scaled by the ratio of 10,000 to the exercise settlement amount. For example, if the exercise settlement amount is $10,000 the limit might be 15,000 contracts per expiration; if $1,000, the limit would be 150,000 contracts per expiration.
Aggregation and Reporting Rules for Binary Positions
For reporting under Rule 8.43, positions in binary options on the same index with different exercise settlement amounts will be aggregated; binary positions will not be aggregated with non-binary option contracts on the same or similar underlying. Positions in binary options on one index are not aggregated with binary options on another index.
Automatic European-Style Exercise at Expiration
Binary options are European-style and are automatically exercised at expiration if the settlement value meets the exercise condition; they are not subject to exercise limits. That means a binary call is automatically paid if the settlement value is equal to or greater than the exercise price, and a put if it is less.
FLEX Binary Options Eligibility
The Exchange proposes that binary options overlying eligible indexes may be traded as FLEX options (customizable contracts) under Rule 4.21(c), provided they remain European-style. Parties may design the exercise settlement value subject to FLEX rules.
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