In today’s briefing:
- [Quiddity Index] SP500/600 Dec25 Rebal: Two ADDs Two DELs and 3 Intra-Review Changes Likely Soon

[Quiddity Index] SP500/600 Dec25 Rebal: Two ADDs Two DELs and 3 Intra-Review Changes Likely Soon
- The SP 500 index tracks the 500 largest names listed in the US and it is one of the most highly-tracked indices in the world.
- In this insight, we take a look at the upcoming constituent changes in the run up to the December 2025 index rebal event.
- We expect two regular changes in December 2025. There are also multiple live M&A events which are likely to trigger intra-review index changes.
