A mark price is a calculated reference used to value derivative positions and support risk controls. It is designed to reduce reliance on isolated or unusual trades in a contract’s own market, although it cannot eliminate all pricing or data risk.
How it is constructed
A venue may combine an index price with a basis or funding adjustment, smoothed market information or other inputs. Different products can use different formulas. Data outages or abnormal market conditions may activate fallback rules.
The index price represents an underlying market reference; the mark price applies the contract’s valuation method. The last price records the most recent executed trade. All three can differ at the same moment.
What it does and does not determine
A mark price may drive unrealized profit and loss, maintenance calculations or liquidation checks. Some interfaces display profit using another reference, so the calculation label matters. In cross-margin accounts, liquidation may additionally depend on total account risk.
The mark price is not an offer to buy or sell at that level. Actual exit results depend on order execution and costs. A stop order triggered by last price can therefore behave differently from a liquidation process monitored with mark price.