A high rollover % generally indicates that: Traders are maintaining their positions with strong conviction. If rollover is accompanied by price rise and high volumes, it may be bullish. If…

It involves two simultaneous transactions: Squaring off the current month’s position. Creating a new position in the next month's contract of the same stock or index.

Rollover activity generally peaks during the last week of the expiry month, especially on F&O expiry day (last Thursday of the month), when traders shift positions to the next month.