Index change event
S&P 500, MidCap 400 & SmallCap 600 Additions & Index Changes: CASY, DOCN & BNL – 6th April 2026
On 6 April 2026, S&P Dow Jones Indices announced 6 index changes affecting 4 companies in the S&P 500, S&P MidCap 400 and S&P SmallCap 600. The most notable move was Casey's General Stores joining the S&P 500 from the S&P MidCap 400.
Announced
2026-04-06
Effective
April 8, 2026 at 5:00:00 PM
Indexes Affected
S&P 500, S&P MidCap 400, S&P SmallCap 600
6
Index Changes in Total
3
Additions
3
Deletions
2
Companies that changed index
What happened to the prices
By the next day's close, the 3 additions with price data had peaked at an average of +2.61%; the deletion, Hologic, has no next-day prices. The largest mover was Broadstone Net Lease, with a peak of +3.46%. The moves are measured from the first extended-hours price after the 17:15 ET announcement.
DigitalOcean Holdings went against the other additions: its next-day open was -0.86% from the first price after the announcement, while the 3 additions averaged +0.16%.
In Short
6 index changes: 3 additions and 3 deletions.
2 companies moved from one S&P index to another, out of 4 in total.
Largest peak move: Broadstone Net Lease, +3.46% 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: Casey's General Stores (CASY)
1 company joined the S&P 500 and 1 left, effective 9 April 2026. Casey's General Stores moved up from the S&P MidCap 400 and Hologic left the S&P family. Casey's General Stores peaked at +2.64% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Casey's General Stores | CASY | S&P MidCap 400 | S&P 500 | 04/09/2026 |
S&P MidCap 400 Additions: DigitalOcean Holdings (DOCN)
1 company joined the S&P MidCap 400 and 1 left, effective 9 April 2026. DigitalOcean Holdings moved up from the S&P SmallCap 600 and Casey's General Stores moved up to the S&P 500. DigitalOcean Holdings peaked at +1.73% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
DigitalOcean Holdings | DOCN | S&P SmallCap 600 | S&P MidCap 400 | 04/09/2026 |
S&P SmallCap 600 Additions: Broadstone Net Lease (BNL)
1 company joined the S&P SmallCap 600 and 1 left, effective 9 April 2026. Broadstone Net Lease is new to the S&P family and DigitalOcean Holdings moved up to the S&P MidCap 400. Broadstone Net Lease peaked at +3.46% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Broadstone Net Lease | BNL | S&P SmallCap 600 | 04/09/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Casey's General Stores | CASY | S&P MidCap 400 | S&P 500 | 747.77 | 757.99 | -0.01% | -0.39% | -0.70% | -0.10% | +2.64% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
DigitalOcean Holdings | DOCN | S&P SmallCap 600 | S&P MidCap 400 | 87.07 | 86.50 | +0.59% | +0.58% | -0.58% | -0.86% | +1.73% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Broadstone Net Lease | BNL | S&P SmallCap 600 | 18.51 | 18.80 | +0.90% | +2.39% | +1.81% | +1.44% | +3.46% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.