S&P 500 rebalance dates

The next quarterly rebalance happens after the close on Friday, December 18, 2026, and the changes take effect prior to the open on Monday, December 21. S&P Dow Jones Indices usually announces the additions and deletions about two weeks earlier, after the close on Friday, December 4.

The rebalance and effective dates follow the S&P U.S. Indices methodology published by S&P Dow Jones Indices: quarterly, after the close on the third Friday of March, June, September and December, effective the following Monday (the Thursday before if that Friday is a market holiday, as with Juneteenth in June 2026 and 2027). The announcement date is a convention rather than a rule — S&P has settled into announcing on the Friday two weeks before — so treat it as an estimate.

No. The index committee decides additions and deletions at its discretion and nothing is official until S&P Dow Jones Indices publishes the press release. Analysts publish predictions based on market cap and eligibility, but announced changes are the only reliable source — they appear on this page and on the changes log the week they're published.

Yes, often. When a constituent is acquired, taken private, merges with another member or spins off a business, S&P replaces it within days — typically announcing about a week ahead. Most changes in a typical year happen this way rather than at the quarterly rebalance.

Index funds trade the changes at the closing auction on the rebalance day. The new composition is official prior to the open on the following Monday — the effective date shown in S&P's announcements and in our changes log.

Only indirectly. The S&P 500 is float-adjusted market-cap-weighted, so the largest companies' weights move every day with their share prices. The quarterly rebalance updates share counts and float factors, which usually nudges weights by fractions of a percent.