Index change event
S&P 500, MidCap 400 & SmallCap 600 Additions & Index Changes: FLEX, MRVL, CDE, ROKU, SANM, SMTC, VIAV, BLKB, CNXC, COTY, CACC, EBC, IVT, LAZ, LQDA, NIC, POOL, RSI, CPB, USLM, WRBY & WSBC – 5th June 2026
On 5 June 2026, S&P Dow Jones Indices announced 44 index changes affecting 35 companies in the S&P 500, S&P MidCap 400 and S&P SmallCap 600. The most notable move was Marvell Technology joining the S&P 500.
Announced
2026-06-05
Effective
June 21, 2026 at 5:00:00 PM
Indexes Affected
S&P 500, S&P MidCap 400, S&P SmallCap 600
44
Index Changes in Total
22
Additions
22
Deletions
9
Companies that changed index
What happened to the prices
By the next day's close, the 17 additions with price data had peaked at an average of +5.95%, against +2.87% for the 18 deletions. The largest mover was Marvell Technology, with a peak of +16.21%. 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.
BellRing Brands went against the other deletions: its next-day open was -3.54% from the post-announcement price, while the 18 deletions averaged +0.30%.
In Short
44 index changes: 22 additions and 22 deletions.
9 companies moved from one S&P index to another, out of 35 in total.
Largest peak move: Marvell Technology, +16.21% 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: Flex (FLEX) and Marvell Technology (MRVL)
2 companies joined the S&P 500 and 2 left, effective 22 June 2026. Flex moved up from the S&P MidCap 400; Marvell Technology is new to the S&P family; Pool and The Campbell's Company moved down to the S&P SmallCap 600. The 2 additions with price data peaked at an average of +11.11% by the next day's close, led by Marvell Technology at +16.21%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Flex | FLEX | S&P MidCap 400 | S&P 500 | 06/22/2026 |
Marvell Technology | MRVL | S&P 500 | 06/22/2026 |
S&P MidCap 400 Additions: Sanmina (SANM), Semtech (SMTC), Viavi Solutions (VIAV) and 2 more
5 companies joined the S&P MidCap 400 and 5 left, effective 22 June 2026. Of the 5 additions, 3 moved up from the S&P SmallCap 600 and 2 are new to the S&P family; of the 5 deletions, 1 moved up to the S&P 500, 3 moved down to the S&P SmallCap 600 and 1 left the S&P family. The 5 additions with price data peaked at an average of +5.50% by the next day's close, led by Semtech at +7.85%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Coeur Mining | CDE | S&P MidCap 400 | 06/22/2026 | |
Roku | ROKU | S&P MidCap 400 | 06/22/2026 | |
Sanmina | SANM | S&P SmallCap 600 | S&P MidCap 400 | 06/22/2026 |
Semtech | SMTC | S&P SmallCap 600 | S&P MidCap 400 | 06/22/2026 |
Viavi Solutions | VIAV | S&P SmallCap 600 | S&P MidCap 400 | 06/22/2026 |
S&P SmallCap 600 Additions: Blackbaud (BLKB), Pool (POOL), The Campbell's Company (CPB) and 12 more
15 companies joined the S&P SmallCap 600 and 15 left, effective 22 June 2026. Of the 15 additions, 2 moved down from the S&P 500, 3 moved down from the S&P MidCap 400 and 10 are new to the S&P family; of the 15 deletions, 3 moved up to the S&P MidCap 400 and 12 left the S&P family. The 15 additions with price data peaked at an average of +4.37% by the next day's close, led by Lazard at +7.96%.
Company | Ticker | Source Index | Final Index | Effective Date |
|---|---|---|---|---|
Blackbaud | BLKB | S&P MidCap 400 | S&P SmallCap 600 | 06/22/2026 |
Concentrix | CNXC | S&P MidCap 400 | S&P SmallCap 600 | 06/22/2026 |
Coty | COTY | S&P MidCap 400 | S&P SmallCap 600 | 06/22/2026 |
Credit Acceptance | CACC | S&P SmallCap 600 | 06/22/2026 | |
Eastern Bankshares | EBC | S&P SmallCap 600 | 06/22/2026 | |
InvenTrust Properties | IVT | S&P SmallCap 600 | 06/22/2026 | |
Lazard | LAZ | S&P SmallCap 600 | 06/22/2026 | |
Liquidia | LQDA | S&P SmallCap 600 | 06/22/2026 | |
Nicolet Bankshares | NIC | S&P SmallCap 600 | 06/22/2026 | |
Pool | POOL | S&P 500 | S&P SmallCap 600 | 06/22/2026 |
Rush Street Interactive | RSI | S&P SmallCap 600 | 06/22/2026 | |
The Campbell's Company | CPB | S&P 500 | S&P SmallCap 600 | 06/22/2026 |
United States Lime & Minerals | USLM | S&P SmallCap 600 | 06/22/2026 | |
Warby Parker | WRBY | S&P SmallCap 600 | 06/22/2026 | |
Wesbanco | WSBC | S&P SmallCap 600 | 06/22/2026 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Flex | FLEX | S&P MidCap 400 | S&P 500 | 151.92 | 153.00 | +2.09% | +2.03% | +0.85% | +3.73% | +6.00% |
Marvell Technology | MRVL | S&P 500 | 263.47 | 262.43 | +5.74% | +6.10% | +3.94% | +10.01% | +16.21% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Coeur Mining | CDE | S&P MidCap 400 | 16.37 | 16.42 | +1.22% | +2.92% | +3.53% | +2.62% | +5.12% | |
Roku | ROKU | S&P MidCap 400 | 122.26 | 123.64 | +2.11% | +3.53% | +2.36% | +1.79% | +3.54% | |
Sanmina | SANM | S&P SmallCap 600 | S&P MidCap 400 | 252.08 | 252.00 | 0.00% | 0.00% | +0.15% | +3.97% | +3.97% |
Semtech | SMTC | S&P SmallCap 600 | S&P MidCap 400 | 151.02 | 149.07 | -0.04% | +1.25% | -1.76% | +6.53% | +7.85% |
Viavi Solutions | VIAV | S&P SmallCap 600 | S&P MidCap 400 | 47.56 | 47.03 | +0.68% | +0.23% | -1.11% | +4.21% | +7.04% |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
Blackbaud | BLKB | S&P MidCap 400 | S&P SmallCap 600 | 28.31 | +0.30% | +3.74% | ||||
Concentrix | CNXC | S&P MidCap 400 | S&P SmallCap 600 | 27.82 | -0.18% | +1.83% | ||||
Coty | COTY | S&P MidCap 400 | S&P SmallCap 600 | 1.96 | 1.99 | 0.00% | -0.99% | -0.62% | 0.00% | +1.84% |
Credit Acceptance | CACC | S&P SmallCap 600 | 544.71 | 551.26 | +1.28% | +1.28% | +1.28% | +2.34% | +4.93% | |
Eastern Bankshares | EBC | S&P SmallCap 600 | 19.85 | 20.12 | +1.64% | +1.14% | +1.14% | +1.09% | +3.16% | |
InvenTrust Properties | IVT | S&P SmallCap 600 | 33.45 | 33.73 | +2.16% | +1.66% | +1.66% | +0.50% | +3.08% | |
Lazard | LAZ | S&P SmallCap 600 | 46.36 | 46.85 | +4.59% | +4.59% | +4.59% | +5.74% | +7.96% | |
Liquidia | LQDA | S&P SmallCap 600 | 61.85 | 63.59 | +0.79% | -0.08% | +1.16% | +2.17% | +5.01% | |
Nicolet Bankshares | NIC | S&P SmallCap 600 | 137.28 | 138.08 | +2.41% | +2.41% | +4.14% | +2.17% | +6.86% | |
Pool | POOL | S&P 500 | S&P SmallCap 600 | 185.52 | 183.25 | 0.00% | +0.95% | +0.95% | -0.28% | +2.59% |
Rush Street Interactive | RSI | S&P SmallCap 600 | 26.14 | 26.50 | +3.74% | +1.85% | +4.00% | +1.55% | +4.79% | |
The Campbell's Company | CPB | S&P 500 | S&P SmallCap 600 | 21.68 | 21.61 | 0.00% | +0.07% | +0.63% | +2.59% | +4.12% |
United States Lime & Minerals | USLM | S&P SmallCap 600 | 104.61 | 106.12 | 0.00% | 0.00% | +5.18% | +1.77% | +6.62% | |
Warby Parker | WRBY | S&P SmallCap 600 | 22.72 | 23.01 | +2.56% | +1.87% | +1.78% | +2.13% | +4.61% | |
Wesbanco | WSBC | S&P SmallCap 600 | 34.39 | 34.62 | +3.81% | +2.28% | +2.28% | +1.95% | +4.39% |
Not a Investment Advice
This page is research about past price behaviour. It is not a recommendation to buy or sell.