Maximum permitted price movement for a futures contract during a trading session under exchange rules.
A fluctuation limit is the maximum price range a futures contract is allowed to move during a trading session under exchange rules. It is often called a daily price limit. If the contract reaches the upper or lower limit, trading may continue only within the permitted band, temporarily halt, expand to a wider band, or stop for the day depending on the contract rules.
Fluctuation limits are designed to support orderly markets, but they do not eliminate risk. They can delay execution, trap hedgers or speculators in positions, widen spreads, and shift liquidity into related contracts or later sessions.
| Item | Practical meaning |
|---|---|
| Reference price | Prior settlement or another exchange-defined starting point. |
| Limit amount | Maximum allowed move above or below the reference price. |
| Contract scope | Limits can differ by product, month, session, and delivery period. |
| Market response | Trading may halt, remain limited, or move to expanded limits. |
| Risk effect | Orders outside the band may be rejected or unfilled; exits may be delayed. |
CME describes a price limit as the maximum price range permitted for a futures contract in each trading session. Its price-limits page and price-limits/circuit-breakers explainer are useful public sources for current concepts and product examples.
For a hedger, a limit move can prevent the intended hedge from being entered or lifted at the planned price. For a leveraged trader, a limit move can block exits while margin exposure continues. For an analyst, limit conditions signal that the displayed price may not represent a fully clearing market.
Always check the current exchange rule and product notice. Fluctuation limits are product-specific and can change with volatility, delivery month status, or exchange action.