1. ACHC will be removed from the S&P MidCap 400 effective September 22. 2. Acadia Healthcare is being replaced by Nutanix and TransUnion in S&P MidCap 400. 3. Acadia will join S&P SmallCap 600, a lower index. 4. Market capitalization adjustments are reassessing index representations. 5. This change reflects a shift in market capitalization relevance.
The removal of ACHC from the S&P MidCap 400 indicates a reduced market perspective, historically leading to downward adjustments.
The change is significant, indicating diminished investor confidence, thus impacting ACHC's stock value.
The market typically reacts quickly to index changes, potentially affecting the stock price soon after the announcement.
NEW YORK, Sept. 5, 2025 /PRNewswire/ -- S&P Dow Jones Indices ("S&P DJI") will make the following changes to the S&P 100, S&P 500, S&P MidCap 400, and S&P SmallCap 600 indices effective prior to the open of trading on Monday, September 22, to coincide with the quarterly rebalance. The changes ensure each index is more representative of its market capitalization range. The companies being removed from the S&P SmallCap 600 are no longer representative of the small-cap market space.
Following is a summary of the changes that will take place prior to the open of trading on the effective date:
Effective Date | Index Name | Action | Company Name | Ticker | GICS Sector |
Sept 22, 2025 | S&P 100 | Addition | Uber Technologies | UBER | Industrials |
Sept 22, 2025 | S&P 100 | Deletion | Charter Communications | CHTR | Communications Services |
Sept 22, 2025 | S&P 500 | Addition | AppLovin | APP | Information Technology |
Sept 22, 2025 | S&P 500 | Addition | Robinhood Markets | HOOD | Financials |
Sept 22, 2025 | S&P 500 | Addition | Emcor Group | EME | Industrials |
Sept 22, 2025 | S&P 500 | Deletion | MarketAxess Holdings | MKTX | Financials |
Sept 22, 2025 | S&P 500 | Deletion | Caesars Entertainment | CZR | Consumer Discretionary |
Sept 22, 2025 | S&P 500 | Deletion | Enphase Energy | ENPH | Information Technology |
Sept 22, 2025 | S&P MidCap 400 | Addition | Nutanix | NTNX | Information Technology |
Sept 22, 2025 | S&P MidCap 400 | Addition | TransUnion | TRU | Industrials |
Sept 22, 2025 | S&P MidCap 400 | Addition | MP Materials | MP | Materials |
Sept 22, 2025 | S&P MidCap 400 | Addition | Kratos Defense & Security Solutions | KTOS | Industrials |
Sept 22, 2025 | S&P MidCap 400 | Deletion | Emcor Group | EME | Industrials |
Sept 22, 2025 | S&P MidCap 400 | Deletion | The Wendy's Company | WEN | Consumer Discretionary |
Sept 22, 2025 | S&P MidCap 400 | Deletion | Acadia Healthcare Company | ACHC | Health Care |
Sept 22, 2025 | S&P MidCap 400 | Deletion | ManpowerGroup | MAN | Industrials |
Sept 22, 2025 | S&P SmallCap 600 | Addition | MarketAxess Holdings | MKTX | Financials |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Caesars Entertainment | CZR | Consumer Discretionary |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Enphase Energy | ENPH | Information Technology |
Sept 22, 2025 | S&P SmallCap 600 | Addition | The Wendy's Company | WEN | Consumer Discretionary |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Acadia Healthcare Company | ACHC | Health Care |
Sept 22, 2025 | S&P SmallCap 600 | Addition | ManpowerGroup | MAN | Industrials |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Noble Corporation | NE | Energy |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Q2 Holdings | QTWO | Information Technology |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Waystar Holding | WAY | Health Care |
Sept 22, 2025 | S&P SmallCap 600 | Addition | Hecla Mining | HL | Materials |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | MP Materials | MP | Materials |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Kratos Defense & Security Solutions | KTOS | Industrials |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | ProPetro Holding | PUMP | Energy |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Xerox Holdings | XRX | Information Technology |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | TechTarget | TTGT | Communication Services |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Mesa Laboratories | MLAB | Health Care |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Owens & Minor | OMI | Health Care |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | B&G Foods | BGS | Consumer Staples |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Jack in the Box | JACK | Consumer Discretionary |
Sept 22, 2025 | S&P SmallCap 600 | Deletion | Simulations Plus | SLP | Health Care |
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SOURCE S&P Dow Jones Indices