Index change event
S&P MidCap 400 & SmallCap 600 Additions & Index Changes: AEIS, AHR, BROS, TTMI, AMRX, APLS & LZ – 27th January 2026
On 27 January 2026, S&P Dow Jones Indices announced 14 index changes affecting 12 companies in the S&P MidCap 400 and S&P SmallCap 600. The most notable move was TTM Technologies joining the S&P MidCap 400 from the S&P SmallCap 600.
Announced
2026-01-27
Effective
January 29, 2026 at 4:00:00 PM
Indexes Affected
S&P MidCap 400, S&P SmallCap 600
14
Index Changes in Total
7
Additions
7
Deletions
2
Companies that changed index
What happened to the prices
By the next day's close, the 7 additions with price data had peaked at an average of +5.52%, against +0.67% for the 5 deletions. The largest mover was TTM Technologies, with a peak of +8.00%. 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.
Civitas Resources went against the other deletions: its next-day open was +2.56% from the post-announcement price, while the 5 deletions averaged -0.08%.
In Short
14 index changes: 7 additions and 7 deletions.
2 companies moved from one S&P index to another, out of 12 in total.
Largest peak move: TTM Technologies, +8.00% 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: Advanced Energy Industries (AEIS), Dutch Bros (BROS), TTM Technologies (TTMI) and 1 more
4 companies joined the S&P MidCap 400 and 4 left, effective 30 January and 2 February 2026. Advanced Energy Industries and TTM Technologies moved up from the S&P SmallCap 600; American Healthcare REIT and Dutch Bros are new to the S&P family; Cadence Bank, Civitas Resources, Comerica and PotlatchDeltic left the S&P family. The 4 additions with price data peaked at an average of +4.46% by the next day's close, led by TTM Technologies at +8.00%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Advanced Energy Industries | AEIS | S&P SmallCap 600 | S&P MidCap 400 | 02/02/2026 |
American Healthcare REIT | AHR | S&P MidCap 400 | 02/02/2026 | |
Dutch Bros | BROS | S&P MidCap 400 | 02/02/2026 | |
TTM Technologies | TTMI | S&P SmallCap 600 | S&P MidCap 400 | 01/30/2026 |
S&P SmallCap 600 Additions: Amneal Pharmaceuticals (AMRX), Apellis Pharmaceuticals (APLS) and LegalZoom.com (LZ)
3 companies joined the S&P SmallCap 600 and 3 left, effective 30 January and 2 February 2026. Amneal Pharmaceuticals, Apellis Pharmaceuticals and LegalZoom.com are new to the S&P family; Advanced Energy Industries and TTM Technologies moved up to the S&P MidCap 400; Elme Communities left the S&P family. The 3 additions with price data peaked at an average of +6.94% by the next day's close, led by Amneal Pharmaceuticals at +7.60%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Amneal Pharmaceuticals | AMRX | S&P SmallCap 600 | 01/30/2026 | |
Apellis Pharmaceuticals | APLS | S&P SmallCap 600 | 02/02/2026 | |
LegalZoom.com | LZ | S&P SmallCap 600 | 02/02/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Advanced Energy Industries | AEIS | S&P SmallCap 600 | S&P MidCap 400 | 259.55 | 256.22 | 0.00% | 0.00% | +0.69% | +1.88% | +4.57% |
American Healthcare REIT | AHR | S&P MidCap 400 | 45.69 | 46.52 | -0.32% | +1.03% | +1.03% | -0.04% | +1.24% | |
Dutch Bros | BROS | S&P MidCap 400 | 57.82 | 58.39 | +2.59% | +2.07% | +1.92% | +1.93% | +4.04% | |
TTM Technologies | TTMI | S&P SmallCap 600 | S&P MidCap 400 | 94.61 | 93.20 | 0.00% | +1.93% | +1.80% | +2.56% | +8.00% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Amneal Pharmaceuticals | AMRX | S&P SmallCap 600 | 13.83 | 13.82 | +4.70% | +6.01% | +3.84% | +4.41% | +7.60% | |
Apellis Pharmaceuticals | APLS | S&P SmallCap 600 | 21.81 | 22.14 | -0.63% | +0.81% | +2.03% | +1.36% | +7.45% | |
LegalZoom.com | LZ | S&P SmallCap 600 | 8.88 | 9.03 | +1.33% | +2.44% | +3.54% | +3.77% | +5.76% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.