Index change event
S&P MidCap 400 & SmallCap 600 Additions & Index Changes: GWRE & ARWR – 22nd January 2025
On 22 January 2025, S&P Dow Jones Indices announced 4 index changes affecting 3 companies in the S&P MidCap 400 and S&P SmallCap 600. The most notable move was Guidewire Software joining the S&P MidCap 400.
Announced
2025-01-22
Effective
January 26, 2025 at 4:00:00 PM
Indexes Affected
S&P MidCap 400, S&P SmallCap 600
4
Index Changes in Total
2
Additions
2
Deletions
1
Companies that changed index
What happened to the prices
By the next day's close, Guidewire Software, the only addition with price data, had peaked at +12.98%, against +4.09% for the 2 deletions. The largest mover was Guidewire Software, with a peak of +12.98%. 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 deletion with price data opened the next day above the post-announcement price. The single addition, Guidewire Software, opened at +3.45%.
In Short
4 index changes: 2 additions and 2 deletions.
1 company moved from one S&P index to another, out of 3 in total.
Largest peak move: Guidewire Software, +12.98% 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: Guidewire Software (GWRE)
1 company joined the S&P MidCap 400 and 1 left, effective 27 January 2025. Guidewire Software is new to the S&P family and Arrowhead Pharmaceuticals moved down to the S&P SmallCap 600. Guidewire Software peaked at +12.98% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Guidewire Software | GWRE | S&P MidCap 400 | 01/27/2025 |
S&P SmallCap 600 Additions: Arrowhead Pharmaceuticals (ARWR)
1 company joined the S&P SmallCap 600 and 1 left, effective 27 January 2025. Arrowhead Pharmaceuticals moved down from the S&P MidCap 400 and Barnes Group left the S&P family. Arrowhead Pharmaceuticals peaked at +8.14% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Arrowhead Pharmaceuticals | ARWR | S&P MidCap 400 | S&P SmallCap 600 | 01/27/2025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Guidewire Software | GWRE | S&P MidCap 400 | 183.49 | 187.65 | +2.37% | +2.96% | +2.85% | +3.45% | +12.98% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Arrowhead Pharmaceuticals | ARWR | S&P MidCap 400 | S&P SmallCap 600 | 19.71 | 20.04 | +2.30% | +2.30% | +1.71% | +0.06% | +8.14% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.