Index change event
S&P MidCap 400 Additions & Index Changes: APG – 18th June 2025
On 18 June 2025, S&P Dow Jones Indices announced 2 index changes affecting 2 companies in the S&P MidCap 400. APi Group replaced United States Steel in the S&P MidCap 400.
Announced
2025-06-18
Effective
June 23, 2025 at 5:00:00 PM
Indexes Affected
S&P MidCap 400
2
Index Changes in Total
1
Additions
1
Deletions
0
Companies that changed index
What happened to the prices
By the next day's close, APi Group, the only addition with price data, had peaked at +10.49%; the deletion, United States Steel, has no usable price data for this date. The moves are measured from the first extended-hours price after the 17:15 ET announcement.
Only APi Group has next-day prices, so there is no group to compare it with: it opened the next day at +3.42% from the first price after the announcement.
In Short
2 index changes: 1 addition and 1 deletion.
No company moved from one S&P index to another in this announcement.
Largest peak move: APi Group, +10.49% 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: APi Group (APG)
1 company joined the S&P MidCap 400 and 1 left, effective 24 June 2025. APi Group is new to the S&P family and United States Steel left the S&P family. APi Group peaked at +10.49% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
APi Group | APG | S&P MidCap 400 | 06/24/2025 |
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Price reaction
The close price is the last price before the announcement. All percentages are measured from the open price after the announcement.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
APi Group | APG | S&P MidCap 400 | 48.95 | 49.95 | +5.11% | +2.12% | +4.02% | +3.42% | +10.49% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.