Index change event
S&P 500 & SmallCap 600 Additions & Index Changes: SNDK, FIBK, PTCT & UPWK – 24th November 2025
On 24 November 2025, S&P Dow Jones Indices announced 8 index changes affecting 7 companies in the S&P 500 and S&P SmallCap 600. The most notable move was Sandisk joining the S&P 500 from the S&P SmallCap 600.
Announced
2025-11-24
Effective
November 27, 2025 at 4:00:00 PM
Indexes Affected
S&P 500, S&P SmallCap 600
8
Index Changes in Total
4
Additions
4
Deletions
1
Companies that changed index
What happened to the prices
By the next day's close, the 4 additions with price data had peaked at an average of +7.28%, against +1.48% for the 2 deletions. The largest mover was Sandisk, with a peak of +9.61%. 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.
Interpublic Group went against the other deletion: its next-day open was +1.05% from the post-announcement price, while the 2 deletions averaged -0.08%.
In Short
8 index changes: 4 additions and 4 deletions.
1 company moved from one S&P index to another, out of 7 in total.
Largest peak move: Sandisk, +9.61% 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: Sandisk (SNDK)
1 company joined the S&P 500 and 1 left, effective 28 November 2025. Sandisk moved up from the S&P SmallCap 600 and Interpublic Group left the S&P family. Sandisk peaked at +9.61% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Sandisk | SNDK | S&P SmallCap 600 | S&P 500 | 11/28/2025 |
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
S&P SmallCap 600 Additions: First Interstate BancSystem (FIBK), PTC Therapeutics (PTCT) and Upwork (UPWK)
3 companies joined the S&P SmallCap 600 and 3 left, effective 28 November and 2 December 2025. First Interstate BancSystem, PTC Therapeutics and Upwork are new to the S&P family; Sandisk moved up to the S&P 500; Hanesbrands and Premier left the S&P family. The 3 additions with price data peaked at an average of +6.51% by the next day's close, led by Upwork at +8.20%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
First Interstate BancSystem | FIBK | S&P SmallCap 600 | 12/02/2025 | |
PTC Therapeutics | PTCT | S&P SmallCap 600 | 11/28/2025 | |
Upwork | UPWK | S&P SmallCap 600 | 11/28/2025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Sandisk | SNDK | S&P SmallCap 600 | S&P 500 | 226.96 | 229.75 | +8.17% | +7.54% | +5.98% | -0.59% | +9.61% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
First Interstate BancSystem | FIBK | S&P SmallCap 600 | 31.72 | 31.95 | +3.29% | +2.07% | +1.75% | +4.88% | +7.20% | |
PTC Therapeutics | PTCT | S&P SmallCap 600 | 79.83 | 82.23 | +0.51% | +2.74% | +2.68% | +2.99% | +4.12% | |
Upwork | UPWK | S&P SmallCap 600 | 18.55 | 18.66 | +4.50% | +4.39% | +3.59% | +5.68% | +8.20% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.