Index change event
S&P MidCap 400 & SmallCap 600 Additions & Index Changes: FTI & PRKS – 2nd September 2025
On 2 September 2025, S&P Dow Jones Indices announced 4 index changes affecting 4 companies in the S&P MidCap 400 and S&P SmallCap 600. The most notable move was TechnipFMC joining the S&P MidCap 400.
Announced
2025-09-02
Effective
September 7, 2025 at 5:00:00 PM
Indexes Affected
S&P MidCap 400, S&P SmallCap 600
4
Index Changes in Total
2
Additions
2
Deletions
0
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 +4.65%, against +0.15% for the 2 deletions. The largest mover was TechnipFMC, with a peak of +5.51%. The moves are measured from the first extended-hours price after the announcement, except for 1 name with no recorded trade after 17:15 ET, measured from the 16:00 ET close.
No name moved against its group: every addition with price data opened the next day above the post-announcement price and every deletion with price data opened at or below it.
In Short
4 index changes: 2 additions and 2 deletions.
No company moved between indexes, and the changes took effect on 2 dates.
Largest peak move: TechnipFMC, +5.51% 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.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
S&P MidCap 400 Additions: TechnipFMC (FTI)
1 company joined the S&P MidCap 400 and 1 left, effective 12 September 2025. TechnipFMC is new to the S&P family and Skechers USA left the S&P family. TechnipFMC peaked at +5.51% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
TechnipFMC | FTI | S&P MidCap 400 | 09/12/2025 |
S&P SmallCap 600 Additions: United Parks & Resorts (PRKS)
1 company joined the S&P SmallCap 600 and 1 left, effective 8 September 2025. United Parks & Resorts is new to the S&P family and Foot Locker left the S&P family. United Parks & Resorts peaked at +3.80% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
United Parks & Resorts | PRKS | S&P SmallCap 600 | 09/08/2025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
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 |
|---|---|---|---|---|---|---|---|---|---|---|
TechnipFMC | FTI | S&P MidCap 400 | 37.55 | 37.76 | +5.19% | +3.34% | +4.58% | +2.83% | +5.51% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
United Parks & Resorts | PRKS | S&P SmallCap 600 | 52.69 | 53.95 | +0.61% | +2.54% | +2.04% | +2.11% | +3.80% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.