What Is the Difference between a “Closing Auction” and a “Settlement Window”?

A closing auction is a specific, short period at the end of a trading day where all market orders and remaining limit orders are executed simultaneously at a single price to determine the closing price. A settlement window is a longer, defined period (e.g.

30-60 minutes) leading up to expiration, during which prices are sampled and averaged to calculate the final cash settlement price. The closing auction is a price-discovery mechanism, while the settlement window is a price-averaging mechanism.

How Does a TWAP Prevent Front-Running Attacks on Large Trades?
What Is the ‘Closing Auction’ Mechanism and Why Is It Important for Index Integrity?
What Is a ‘Settlement Auction’ and How Does It Relate to TWAP?
How Does the Look-Back Period Affect the Values of IVR and IVP?
How Does the Chosen Time Window for TWAP Impact the Final Settlement Price’s Stability?
What Is the Term for the Time Period over Which the Final Settlement Price Is Calculated?
Does the Volatility of the Underlying Asset (E.g. a Highly Volatile Altcoin) Necessitate a Longer or Shorter TWAP Window?
What Is the Trade-off between the Averaging Time Window of a TWAP and Its Responsiveness to Legitimate Price Changes?

Glossar