Index change event
S&P 500 & SmallCap 600 Additions & Index Changes: Q, SOLS, KMX & EMN – 27th October 2025
On 27 October 2025, S&P Dow Jones Indices announced 8 index changes affecting 6 companies in the S&P 500 and S&P SmallCap 600. The most notable move was Solstice Advance Materials joining the S&P 500.
Announced
2025-10-27
Effective
October 29, 2025 at 5:00:00 PM
Indexes Affected
S&P 500, S&P SmallCap 600
8
Index Changes in Total
4
Additions
4
Deletions
2
Companies that changed index
What happened to the prices
By the next day's close, the 2 additions with price data had peaked at an average of +8.95%, against +1.41% for the 4 deletions. The largest mover was Solstice Advance Materials, with a peak of +9.29%. The moves are measured from the first extended-hours price after the announcement, except for 2 names with no recorded trade after 17:15 ET, measured from the 16:00 ET close.
Caleres Inc went against the other deletions: its next-day open was +0.49% from the post-announcement price, while the 4 deletions averaged -0.27%.
In Short
8 index changes: 4 additions and 4 deletions.
2 companies moved from one S&P index to another, out of 6 in total.
Largest peak move: Solstice Advance Materials, +9.29% by the next day's close.
The changes, index by index
An empty cell means the company was not in the S&P family before, or left it.
S&P 500 Additions: Qnity Electronics (Q) and Solstice Advance Materials (SOLS)
2 companies joined the S&P 500 and 2 left, effective 30 and 31 October and 3 and 4 November 2025. Qnity Electronics and Solstice Advance Materials are new to the S&P family and CarMax and Eastman Chemical Co moved down to the S&P SmallCap 600. The 2 additions with price data peaked at an average of +8.95% by the next day's close, led by Solstice Advance Materials at +9.29%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Qnity Electronics | Q | S&P 500 | 11/03/2025 | |
Solstice Advance Materials | SOLS | S&P 500 | 10/30/2025 |
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
S&P SmallCap 600 Additions: CarMax (KMX) and Eastman Chemical Co (EMN)
2 companies joined the S&P SmallCap 600 and 2 left, effective 31 October and 4 November 2025. CarMax and Eastman Chemical Co moved down from the S&P 500 and Caleres Inc and USANA Health Sciences left the S&P family. The 2 additions with price data peaked at an average of +0.20% by the next day's close, led by Eastman Chemical Co at +0.39%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
CarMax | KMX | S&P 500 | S&P SmallCap 600 | 10/31/2025 |
Eastman Chemical Co | EMN | S&P 500 | S&P SmallCap 600 | 11/04/2025 |
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Price reaction
The close price is the last price before the announcement. Percentages are measured from the open price after the announcement, or from the close for a company with no price after it.
S&P 500 Additions Changes
Company | Ticker | Source Index | Final Index | Close Price | Open Price at Announcement | % Change +5 min | % Change +30 min | % Change at 20:00 Hrs | % Change by Next Day Open | % Highest Change by Next Day Close |
|---|---|---|---|---|---|---|---|---|---|---|
Qnity Electronics | Q | S&P 500 | 95.30 | +3.89% | +8.60% | |||||
Solstice Advance Materials | SOLS | S&P 500 | 45.75 | +3.83% | +9.29% |
S&P MidCap 400 Additions Changes
Company | Ticker | Source Index | Final Index | Close Price | Open Price at Announcement | % Change +5 min | % Change +30 min | % Change at 20:00 Hrs | % Change by Next Day Open | % Highest Change by Next Day Close |
|---|---|---|---|---|---|---|---|---|---|---|
S&P SmallCap 600 Additions Changes
Not a Investment Advice
Company | Ticker | Source Index | Final Index | Close Price | Open Price at Announcement | % Change +5 min | % Change +30 min | % Change at 20:00 Hrs | % Change by Next Day Open | % Highest Change by Next Day Close |
|---|---|---|---|---|---|---|---|---|---|---|
CarMax | KMX | S&P 500 | S&P SmallCap 600 | 45.08 | 45.10 | 0.00% | -0.04% | -0.11% | -0.42% | 0.00% |
Eastman Chemical Co | EMN | S&P 500 | S&P SmallCap 600 | 63.78 | 63.75 | 0.00% | -0.97% | -1.47% | -0.39% | +0.39% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.