Index change event
S&P MidCap 400 & SmallCap 600 Additions & Index Changes: SN, FG & FLO – 13th May 2026
On 13 May 2026, S&P Dow Jones Indices announced 6 index changes affecting 5 companies in the S&P MidCap 400 and S&P SmallCap 600. The most notable move was SharkNinja joining the S&P MidCap 400.
Announced
2026-05-13
Effective
May 17, 2026 at 5:00:00 PM
Indexes Affected
S&P MidCap 400, S&P SmallCap 600
6
Index Changes in Total
3
Additions
3
Deletions
1
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 +4.42%, against +0.99% for the 2 deletions. The largest mover was F&G Annuities & Life, with a peak of +4.46%. 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.
Mister Car Wash went against the other deletion: its next-day open was -0.01% from the post-announcement price, while the 2 deletions averaged +0.19%.
In Short
6 index changes: 3 additions and 3 deletions.
1 company moved from one S&P index to another, out of 5 in total.
Largest peak move: F&G Annuities & Life, +4.46% 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.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
S&P MidCap 400 Additions: SharkNinja (SN)
1 company joined the S&P MidCap 400 and 1 left, effective 18 May 2026. SharkNinja is new to the S&P family and Flowers Foods moved down to the S&P SmallCap 600. SharkNinja peaked at +4.37% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
SharkNinja | SN | S&P MidCap 400 | 05/18/2026 |
S&P SmallCap 600 Additions: F&G Annuities & Life (FG) and Flowers Foods (FLO)
2 companies joined the S&P SmallCap 600 and 2 left, effective 18 and 19 May 2026. Flowers Foods moved down from the S&P MidCap 400; F&G Annuities & Life is new to the S&P family; CSG Systems Intl and Mister Car Wash left the S&P family. The 2 additions with price data peaked at an average of +3.08% by the next day's close, led by F&G Annuities & Life at +4.46%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
F&G Annuities & Life | FG | S&P SmallCap 600 | 05/19/2026 | |
Flowers Foods | FLO | S&P MidCap 400 | S&P SmallCap 600 | 05/18/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
SharkNinja | SN | S&P MidCap 400 | 102.94 | 105.35 | +2.63% | +2.64% | +2.57% | +1.68% | +4.37% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
F&G Annuities & Life | FG | S&P SmallCap 600 | 28.09 | 28.94 | 0.00% | +0.90% | +1.59% | +2.52% | +4.46% | |
Flowers Foods | FLO | S&P MidCap 400 | S&P SmallCap 600 | 7.73 | 7.75 | +1.29% | +0.26% | 0.00% | +0.39% | +1.70% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.