Index change event
S&P 500, MidCap 400 & SmallCap 600 Additions & Index Changes: COHR, SATS, LITE, VRT, CTRE, IDCC, MOG.A, SITM, SOLS, VICR, AGX, ASGN, KMPR, LW, LAUR, LTH, LIF, LYFT, MTCH, MOH, NSSC, PAYC, RITM, SPHR, VSEC & GTM – 6th March 2026
On 6 March 2026, S&P Dow Jones Indices announced 60 index changes affecting 44 companies in the S&P 100, S&P 500, S&P MidCap 400 and S&P SmallCap 600. The most notable move was Vertiv Holdings joining the S&P 500.
Announced
2026-03-06
Effective
March 12, 2026 at 5:00:00 PM
Indexes Affected
S&P 100, S&P 500, S&P MidCap 400, S&P SmallCap 600
60
Index Changes in Total
30
Additions
30
Deletions
16
Companies that changed index
What happened to the prices
By the next day's close, the 23 additions with price data had peaked at an average of +5.88%, against +0.23% for the 21 deletions. The largest mover was Lumentum Holdings, with a peak of +13.67%. The moves are measured from the first extended-hours price after the announcement, except for 12 names with no recorded trade after 17:15 ET, measured from the 16:00 ET close.
Vertiv Holdings went against the other additions: its next-day open was +3.47% from the post-announcement price, while the 23 additions averaged -0.25%.
In Short
60 index changes: 30 additions and 30 deletions.
16 companies moved from one S&P index to another, out of 44 in total.
Largest peak move: Lumentum Holdings, +13.67% 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: Coherent (COHR), Lumentum Holdings (LITE), Vertiv Holdings (VRT) and 1 more
4 companies joined the S&P 500 and 4 left, effective 23 March 2026. Coherent, EchoStar and Lumentum Holdings moved up from the S&P MidCap 400; Vertiv Holdings is new to the S&P family; Lamb Weston Holdings, Match Group, Molina Healthcare and Paycom Software moved down to the S&P SmallCap 600. The 4 additions with price data peaked at an average of +8.77% by the next day's close, led by Lumentum Holdings at +13.67%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Coherent | COHR | S&P MidCap 400 | S&P 500 | 03/23/2026 |
EchoStar | SATS | S&P MidCap 400 | S&P 500 | 03/23/2026 |
Lumentum Holdings | LITE | S&P MidCap 400 | S&P 500 | 03/23/2026 |
Vertiv Holdings | VRT | S&P 500 | 03/23/2026 |
S&P MidCap 400 Additions: CareTrust REIT (CTRE), InterDigital (IDCC), Moog (MOG.A) and 3 more
6 companies joined the S&P MidCap 400 and 6 left, effective 23 March 2026. Of the 6 additions, all 6 moved up from the S&P SmallCap 600; of the 6 deletions, 3 moved up to the S&P 500 and 3 moved down to the S&P SmallCap 600. The 6 additions with price data peaked at an average of +3.73% by the next day's close, led by SiTime at +9.00%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
CareTrust REIT | CTRE | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
InterDigital | IDCC | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
Moog | MOG.A | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
SiTime | SITM | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
Solstice Advanced Materials | SOLS | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
Vicor | VICR | S&P SmallCap 600 | S&P MidCap 400 | 03/23/2026 |
S&P SmallCap 600 Additions: Lamb Weston Holdings (LW), Match Group (MTCH), Molina Healthcare (MOH) and 13 more
16 companies joined the S&P SmallCap 600 and 16 left, effective 13 and 23 March 2026. Of the 16 additions, 4 moved down from the S&P 500, 3 moved down from the S&P MidCap 400 and 9 are new to the S&P family; of the 16 deletions, 6 moved up to the S&P MidCap 400 and 10 left the S&P family. The 16 additions with price data peaked at an average of +4.07% by the next day's close, led by Argan at +12.37%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Argan | AGX | S&P SmallCap 600 | 03/23/2026 | |
ASGN | ASGN | S&P MidCap 400 | S&P SmallCap 600 | 03/23/2026 |
Kemper | KMPR | S&P MidCap 400 | S&P SmallCap 600 | 03/23/2026 |
Lamb Weston Holdings | LW | S&P 500 | S&P SmallCap 600 | 03/23/2026 |
Laureate Education | LAUR | S&P SmallCap 600 | 03/23/2026 | |
Life Time Group Holdings | LTH | S&P SmallCap 600 | 03/23/2026 | |
Life360 | LIF | S&P SmallCap 600 | 03/23/2026 | |
Lyft | LYFT | S&P SmallCap 600 | 03/23/2026 | |
Match Group | MTCH | S&P 500 | S&P SmallCap 600 | 03/23/2026 |
Molina Healthcare | MOH | S&P 500 | S&P SmallCap 600 | 03/23/2026 |
NAPCO Security Technologies | NSSC | S&P SmallCap 600 | 03/13/2026 | |
Paycom Software | PAYC | S&P 500 | S&P SmallCap 600 | 03/23/2026 |
Rithm Capital | RITM | S&P SmallCap 600 | 03/23/2026 | |
Sphere Entertainment | SPHR | S&P SmallCap 600 | 03/23/2026 | |
VSE | VSEC | S&P SmallCap 600 | 03/23/2026 | |
ZoomInfo Technologies | GTM | S&P MidCap 400 | S&P SmallCap 600 | 03/23/2026 |
S&P 100 Additions: Applied Materials (AMAT), GE Vernova (GEV), Lam Research (LRCX) and 1 more
4 companies joined the S&P 100 and 4 left, effective 23 March 2026. Applied Materials, GE Vernova, Lam Research and Micron Technology joined and American Intl Group, Metlife, PayPal Holdings and Target left the S&P 100. The 4 additions with price data peaked at an average of +5.07% by the next day's close, led by Lam Research at +6.06%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Applied Materials | AMAT | S&P 100 | 03/23/2026 | |
GE Vernova | GEV | S&P 100 | 03/23/2026 | |
Lam Research | LRCX | S&P 100 | 03/23/2026 | |
Micron Technology | MU | S&P 100 | 03/23/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Coherent | COHR | S&P MidCap 400 | S&P 500 | 235.72 | 236.25 | -0.48% | -0.11% | +0.32% | +0.06% | +7.66% |
EchoStar | SATS | S&P MidCap 400 | S&P 500 | 106.24 | 107.84 | +3.79% | +2.58% | +1.67% | +0.32% | +4.04% |
Lumentum Holdings | LITE | S&P MidCap 400 | S&P 500 | 558.44 | 563.92 | +1.63% | +0.44% | +0.72% | +2.50% | +13.67% |
Vertiv Holdings | VRT | S&P 500 | 241.78 | 243.06 | +5.92% | +4.58% | +4.68% | +3.47% | +9.71% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
CareTrust REIT | CTRE | S&P SmallCap 600 | S&P MidCap 400 | 39.94 | -1.50% | +0.79% | ||||
InterDigital | IDCC | S&P SmallCap 600 | S&P MidCap 400 | 357.06 | 355.00 | 0.00% | 0.00% | +0.59% | -1.41% | +2.82% |
Moog | MOG.A | S&P SmallCap 600 | S&P MidCap 400 | 316.80 | -1.93% | +0.29% | ||||
SiTime | SITM | S&P SmallCap 600 | S&P MidCap 400 | 327.35 | 328.00 | 0.00% | 0.00% | 0.00% | -3.59% | +9.00% |
Solstice Advanced Materials | SOLS | S&P SmallCap 600 | S&P MidCap 400 | 72.17 | 72.07 | 0.00% | -0.69% | -2.02% | -2.37% | +2.58% |
Vicor | VICR | S&P SmallCap 600 | S&P MidCap 400 | 162.67 | 159.63 | 0.00% | 0.00% | +0.29% | +0.62% | +6.91% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Argan | AGX | S&P SmallCap 600 | 414.20 | 416.00 | 0.00% | 0.00% | 0.00% | -0.34% | +12.37% | |
ASGN | ASGN | S&P MidCap 400 | S&P SmallCap 600 | 42.89 | -1.66% | -1.05% | ||||
Kemper | KMPR | S&P MidCap 400 | S&P SmallCap 600 | 31.78 | +0.03% | +0.44% | ||||
Lamb Weston Holdings | LW | S&P 500 | S&P SmallCap 600 | 46.03 | 46.00 | 0.00% | -1.09% | -0.80% | +0.13% | +1.65% |
Laureate Education | LAUR | S&P SmallCap 600 | 31.67 | 32.00 | 0.00% | 0.00% | 0.00% | +1.78% | +7.71% | |
Life Time Group Holdings | LTH | S&P SmallCap 600 | 25.37 | 25.42 | 0.00% | +0.12% | +2.52% | +0.71% | +6.88% | |
Life360 | LIF | S&P SmallCap 600 | 45.08 | 45.36 | 0.00% | 0.00% | +1.32% | +0.02% | +5.80% | |
Lyft | LYFT | S&P SmallCap 600 | 13.25 | 13.24 | 0.00% | +1.13% | +1.74% | +0.76% | +4.65% | |
Match Group | MTCH | S&P 500 | S&P SmallCap 600 | 30.47 | 30.49 | 0.00% | -1.12% | -1.12% | -0.23% | +2.18% |
Molina Healthcare | MOH | S&P 500 | S&P SmallCap 600 | 144.47 | 145.00 | 0.00% | -0.66% | -0.84% | -0.32% | +2.20% |
NAPCO Security Technologies | NSSC | S&P SmallCap 600 | 41.16 | 41.68 | +2.69% | +5.42% | +3.19% | +0.91% | +6.74% | |
Paycom Software | PAYC | S&P 500 | S&P SmallCap 600 | 138.01 | 136.00 | 0.00% | -1.03% | 0.00% | +0.35% | +2.10% |
Rithm Capital | RITM | S&P SmallCap 600 | 9.65 | 9.65 | 0.00% | +1.54% | +2.90% | +0.21% | +2.90% | |
Sphere Entertainment | SPHR | S&P SmallCap 600 | 112.82 | 112.90 | 0.00% | +0.09% | +0.99% | +0.80% | +5.84% | |
VSE | VSEC | S&P SmallCap 600 | 209.39 | 212.42 | 0.00% | 0.00% | -0.67% | +0.07% | +4.50% | |
ZoomInfo Technologies | GTM | S&P MidCap 400 | S&P SmallCap 600 | 6.56 | -1.52% | +0.23% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.