Index change event
S&P 500, MidCap 400 & SmallCap 600 Additions & Index Changes: CVNA, FIX, CRH, BAH, BWA, DY, HL, PINS, SPXC, ULS, CWST, HE, INDV, NSP, IRDM, LKQ, VAC, MHK, PRGO, POWI, PRIM, SOLS, UAA & UA – 5th December 2025
On 5 December 2025, S&P Dow Jones Indices announced 48 index changes affecting 33 companies in the S&P 500, S&P MidCap 400 and S&P SmallCap 600. The most notable move was CRH joining the S&P 500.
Announced
2025-12-05
Effective
December 21, 2025 at 4:00:00 PM
Indexes Affected
S&P 500, S&P MidCap 400, S&P SmallCap 600
48
Index Changes in Total
24
Additions
24
Deletions
15
Companies that changed index
What happened to the prices
By the next day's close, the 14 additions with price data had peaked at an average of +5.37%, against +1.66% for the 19 deletions. The largest mover was Carvana, with a peak of +12.79%. 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.
LKQ went against the other deletions: its next-day open was +1.75% from the post-announcement price, while the 19 deletions averaged -0.01%.
In Short
48 index changes: 24 additions and 24 deletions.
15 companies moved from one S&P index to another, out of 33 in total.
Largest peak move: Carvana, +12.79% 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: Carvana (CVNA), Comfort Systems USA (FIX) and CRH (CRH)
3 companies joined the S&P 500 and 3 left, effective 22 December 2025. Comfort Systems USA moved up from the S&P MidCap 400; Carvana and CRH are new to the S&P family; LKQ, Mohawk Industries and Solstice Advanced Materials moved down to the S&P SmallCap 600. The 3 additions with price data peaked at an average of +7.55% by the next day's close, led by Carvana at +12.79%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Carvana | CVNA | S&P 500 | 12/22/2025 | |
Comfort Systems USA | FIX | S&P MidCap 400 | S&P 500 | 12/22/2025 |
CRH | CRH | S&P 500 | 12/22/2025 |
S&P MidCap 400 Additions: Borgwarner (BWA), Dycom Industries (DY), Hecla Mining Co (HL) and 4 more
7 companies joined the S&P MidCap 400 and 8 left, effective 22 December 2025. Of the 7 additions, 4 moved up from the S&P SmallCap 600 and 3 are new to the S&P family; of the 8 deletions, 1 moved up to the S&P 500 and 7 moved down to the S&P SmallCap 600. The 7 additions with price data peaked at an average of +3.10% by the next day's close, led by Booz Allen Hamilton Holding at +6.14%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Booz Allen Hamilton Holding | BAH | S&P MidCap 400 | 12/22/2025 | |
Borgwarner | BWA | S&P SmallCap 600 | S&P MidCap 400 | 12/22/2025 |
Dycom Industries | DY | S&P SmallCap 600 | S&P MidCap 400 | 12/22/2025 |
Hecla Mining Co | HL | S&P SmallCap 600 | S&P MidCap 400 | 12/22/2025 |
Pinterest | PINS | S&P MidCap 400 | 12/22/2025 | |
SPX Technologies | SPXC | S&P SmallCap 600 | S&P MidCap 400 | 12/22/2025 |
UL Solutions | ULS | S&P MidCap 400 | 12/22/2025 |
S&P SmallCap 600 Additions: LKQ (LKQ), Mohawk Industries (MHK), Solstice Advanced Materials (SOLS) and 11 more
14 companies joined the S&P SmallCap 600 and 13 left, effective 22 December 2025. Of the 14 additions, 3 moved down from the S&P 500, 7 moved down from the S&P MidCap 400 and 4 are new to the S&P family; of the 13 deletions, 4 moved up to the S&P MidCap 400 and 9 left the S&P family. The 14 additions with price data peaked at an average of +3.40% by the next day's close, led by Hawaiian Electric Industries at +11.12%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Casella Waste Systems | CWST | S&P SmallCap 600 | 12/22/2025 | |
Hawaiian Electric Industries | HE | S&P SmallCap 600 | 12/22/2025 | |
Indivior | INDV | S&P SmallCap 600 | 12/22/2025 | |
Insperity | NSP | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
Iridium Communications | IRDM | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
LKQ | LKQ | S&P 500 | S&P SmallCap 600 | 12/22/2025 |
Marriott Vacations Worldwide | VAC | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
Mohawk Industries | MHK | S&P 500 | S&P SmallCap 600 | 12/22/2025 |
Perrigo Company | PRGO | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
Power Integrations | POWI | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
Primoris Services | PRIM | S&P SmallCap 600 | 12/22/2025 | |
Solstice Advanced Materials | SOLS | S&P 500 | S&P SmallCap 600 | 12/22/2025 |
Under Armour A | UAA | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
Under Armour C | UA | S&P MidCap 400 | S&P SmallCap 600 | 12/22/2025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Carvana | CVNA | S&P 500 | 399.77 | 405.16 | +6.12% | +8.34% | +8.35% | +7.27% | +12.79% | |
Comfort Systems USA | FIX | S&P MidCap 400 | S&P 500 | 1001.48 | 1005.50 | +1.94% | +1.14% | +1.29% | +0.31% | +3.10% |
CRH | CRH | S&P 500 | 119.49 | 120.80 | +4.51% | +5.67% | +5.50% | +5.13% | +6.77% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Booz Allen Hamilton Holding | BAH | S&P MidCap 400 | 88.01 | 88.42 | +3.84% | +1.84% | +2.08% | +3.88% | +6.14% | |
Borgwarner | BWA | S&P SmallCap 600 | S&P MidCap 400 | 43.30 | 43.05 | 0.00% | 0.00% | 0.00% | -0.98% | +0.88% |
Dycom Industries | DY | S&P SmallCap 600 | S&P MidCap 400 | 351.80 | 347.63 | 0.00% | +1.04% | +1.04% | +2.05% | +2.58% |
Hecla Mining Co | HL | S&P SmallCap 600 | S&P MidCap 400 | 16.97 | 16.95 | -0.29% | +0.06% | +0.18% | +0.24% | +1.65% |
Pinterest | PINS | S&P MidCap 400 | 26.75 | 26.75 | +2.86% | +5.45% | +3.85% | +2.06% | +5.76% | |
SPX Technologies | SPXC | S&P SmallCap 600 | S&P MidCap 400 | 208.67 | +0.27% | +0.88% | ||||
UL Solutions | ULS | S&P MidCap 400 | 76.60 | 77.00 | +2.71% | +2.66% | +1.30% | +1.87% | +3.83% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Casella Waste Systems | CWST | S&P SmallCap 600 | 94.57 | 95.96 | +1.01% | +1.01% | +1.01% | +2.58% | +5.27% | |
Hawaiian Electric Industries | HE | S&P SmallCap 600 | 11.25 | 11.42 | +1.05% | +1.58% | +1.49% | +4.64% | +11.12% | |
Indivior | INDV | S&P SmallCap 600 | 35.12 | 35.46 | +3.44% | +3.98% | +4.15% | +6.37% | +7.16% | |
Insperity | NSP | S&P MidCap 400 | S&P SmallCap 600 | 35.14 | 35.85 | 0.00% | 0.00% | -0.99% | -2.30% | +0.23% |
Iridium Communications | IRDM | S&P MidCap 400 | S&P SmallCap 600 | 17.74 | 18.01 | +0.39% | -0.83% | -0.72% | +0.06% | +3.72% |
LKQ | LKQ | S&P 500 | S&P SmallCap 600 | 29.45 | 29.13 | 0.00% | +1.48% | +0.45% | +1.75% | +2.23% |
Marriott Vacations Worldwide | VAC | S&P MidCap 400 | S&P SmallCap 600 | 55.08 | +0.56% | +1.58% | ||||
Mohawk Industries | MHK | S&P 500 | S&P SmallCap 600 | 110.69 | 110.00 | 0.00% | 0.00% | +0.45% | +0.56% | +0.91% |
Perrigo Company | PRGO | S&P MidCap 400 | S&P SmallCap 600 | 13.44 | 13.53 | 0.00% | +0.43% | +0.43% | -1.85% | +0.43% |
Power Integrations | POWI | S&P MidCap 400 | S&P SmallCap 600 | 36.51 | 36.77 | 0.00% | +0.08% | +0.18% | 0.00% | +2.23% |
Primoris Services | PRIM | S&P SmallCap 600 | 125.66 | 128.60 | -0.82% | -0.82% | -0.82% | +3.72% | +7.31% | |
Solstice Advanced Materials | SOLS | S&P 500 | S&P SmallCap 600 | 47.13 | 47.00 | 0.00% | +0.21% | +0.55% | +0.36% | +2.98% |
Under Armour A | UAA | S&P MidCap 400 | S&P SmallCap 600 | 4.55 | 4.52 | -1.99% | +0.22% | -1.29% | +0.22% | +0.88% |
Under Armour C | UA | S&P MidCap 400 | S&P SmallCap 600 | 4.34 | 4.34 | -0.46% | +1.57% | +0.23% | +0.23% | +1.57% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.