Definition
Rebalance Date
The scheduled date on which constituent membership, exposure measurements and weights are recalculated and applied to the index.
- Status
- Definition in force
- Method version
- 1.0
- Reviewed
- 2026-08-22
In the Live Index framework
A rules-based index changes on a schedule rather than on news. The rebalance date is that schedule. Between rebalances, weights drift with price and nothing else: a company that publishes a new filing showing higher live exposure does not gain weight until the next scheduled recalculation, and a company that loses eligibility does not leave until then either.
Fixing the date in advance is what makes the series reproducible. Anyone holding the same stored inputs and the same published rule should be able to recompute the index at any rebalance date and obtain the same level. A discretionary mid-cycle change breaks that property, so the framework permits only two: a corporate action that removes a listing, and a correction to an input that was wrong when published.
The cadence, the announcement lead time and the effective time of day are fixed in the methodology before the first release, not chosen afterwards to suit the first result.