Exchange Default Fat Finger Limits
Fat Finger Checks are mandatory for both Pre-Market and Regular Sessions and applied to both simple and complex orders. The following Exchange defaults are applied if not specified by the user. Fat Finger checks will not be applicable for any Multi-Class Spread instruments that trade on the floor only. Fat Finger checks will remain applicable for Multi-Class complex instruments containing only legs of underlying SPX as they are eligible for trading on the electronic book.
| Limit Price Range |
| Fat Finger Dollar-Based Limit Default |
|---|---|---|
| $0.00 - $1.99 | No Value | $1.00 |
| $2.00 - $5.00 | No Value | $1.50 |
| $5.01 - $10.00 | No Value | $2.00 |
| $10.01 - $20.00 | No Value | $3.00 |
| $20.01 - $50.00 | No Value | $4.00 |
| $50.01 - $100.00 | No Value | $6.00 |
| $100.01 & Above | 8% | Not Valid |
| Limit Price Range |
| Fat Finger Dollar-Based Limit Default |
|---|---|---|
| $0.00 - $1.99 | No Value | $0.50 |
| $2.00 - $5.00 | No Value | $0.75 |
| $5.01 - $10.00 | No Value | $1.00 |
| $10.01 - $20.00 | No Value | $1.50 |
| $20.01 - $50.00 | No Value | $2.00 |
| $50.01 - $100.00 | No Value | $3.00 |
| $100.01 & Above | 4% | Not Valid |
SPX, SPXW, and SPXO* are considered Exception Classes and have unique Fat Finger default values for the Pre-Open and Regular sessions.
| Limit Price Range |
| Fat Finger Dollar-Based Limit Default |
|---|---|---|
| $0.00 - $1.99 | No Value | $15.00 |
| $2.00 - $5.00 | No Value | $15.00 |
| $5.01 - $10.00 | No Value | $15.00 |
| $10.01 - $20.00 | No Value | $15.00 |
| $20.01 - $50.00 | No Value | $20.00 |
| $50.01 - $100.00 | No Value | $20.00 |
| $100.01 & Above | No Value | $25.00 |
| Limit Price Range |
| Fat Finger Dollar-Based Limit Default |
|---|---|---|
| $0.00 - $1.99 | No Value | $1.00 |
| $2.00 - $5.00 | No Value | $1.50 |
| $5.01 - $10.00 | No Value | $2.00 |
| $10.01 - $20.00 | No Value | $3.00 |
| $20.01 - $50.00 | No Value | $4.00 |
| $50.01 - $100.00 | No Value | $6.00 |
| $100.01 & Above | 16% | Not Valid |
See the Cboe Titanium U.S. Equities/Options Web Portal Port Controls Specification for additional details on how fat finger settings can be managed intraday by Members.
*Effective 11/09/26