Index change event
S&P MidCap 400 & SmallCap 600 Additions & Index Changes: KRYS, TPC & VVX – 20th July 2026
On 20 July 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 Krystal Biotech joining the S&P MidCap 400 from the S&P SmallCap 600.
Announced
2026-07-20
Effective
July 23, 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 3 additions with price data had peaked at an average of +4.95%, against +0.06% for the 2 deletions. The largest mover was Tutor Perini Corp, with a peak of +9.03%. The moves are measured from the first extended-hours price after the announcement, except for 2 names with no recorded trade after 17:15 ET, measured from the 16:00 ET close.
Krystal Biotech went against the other additions: its next-day open was -0.44% from the post-announcement price, while the 3 additions averaged +2.62%.
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: Tutor Perini Corp, +9.03% 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: Krystal Biotech (KRYS)
1 company joined the S&P MidCap 400 and 1 left, effective 24 July 2026. Krystal Biotech moved up from the S&P SmallCap 600 and Taylor Morrison Home left the S&P family. Krystal Biotech peaked at +1.39% by the next day's close.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Krystal Biotech | KRYS | S&P SmallCap 600 | S&P MidCap 400 | 07/24/2026 |
S&P SmallCap 600 Additions: Tutor Perini Corp (TPC) and V2X (VVX)
2 companies joined the S&P SmallCap 600 and 2 left, effective 24 and 27 July 2026. Tutor Perini Corp and V2X are new to the S&P family; Krystal Biotech moved up to the S&P MidCap 400; Avanos Medical left the S&P family. The 2 additions with price data peaked at an average of +6.73% by the next day's close, led by Tutor Perini Corp at +9.03%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Tutor Perini Corp | TPC | S&P SmallCap 600 | 07/24/2026 | |
V2X | VVX | S&P SmallCap 600 | 07/27/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Krystal Biotech | KRYS | S&P SmallCap 600 | S&P MidCap 400 | 339.22 | 338.20 | -0.35% | +0.30% | +0.30% | -0.44% | +1.39% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Tutor Perini Corp | TPC | S&P SmallCap 600 | 80.54 | 81.17 | +3.26% | +3.49% | +4.53% | +5.64% | +9.03% | |
V2X | VVX | S&P SmallCap 600 | 76.15 | 77.46 | +4.44% | +4.44% | +2.63% | +2.65% | +4.44% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.