CRH, Carvana and Comfort Systems USA Set to Join S&P 500; Others to Join S&P MidCap 400 and S&P SmallCap 600

Rhea-AI Summary

S&P Dow Jones Indices will implement index changes effective prior to the open on Dec 22, 2025 as part of its quarterly rebalance. Key moves: CRH, Carvana (CVNA) and Comfort Systems USA (FIX) join the S&P 500; Dycom (DY) moves from the S&P SmallCap 600 to the S&P MidCap 400.

The reconstitution shifts multiple companies across the S&P 500, MidCap 400 and SmallCap 600 to better reflect market-cap ranges.

Positive

• CRH added to S&P 500 effective Dec 22, 2025
• Carvana added to S&P 500 effective Dec 22, 2025
• Dycom (DY) promoted to S&P MidCap 400 effective Dec 22, 2025

Negative

• Multiple deletions from S&P 500 including LKQ, Mohawk and Solstice on Dec 22, 2025
• Dycom removed from S&P SmallCap 600 effective Dec 22, 2025

News Market Reaction – FIX

-1.20%

-1.20% Session close to close

In the Dec 8 session, FIX declined 1.20%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement details FIX’s promotion from the S&P MidCap 400 to the S&P 500 effective Dec 22, 2...

Analysis

This announcement details FIX’s promotion from the S&P MidCap 400 to the S&P 500 effective Dec 22, 2025, a change that can influence index-based ownership and liquidity. In light of strong FY2025 results and a substantial backlog reported later, the index move fits a trajectory of growth. Investors may watch subsequent disclosures, insider activity, and future earnings to see how the company performs within the large-cap benchmark.

Key Figures

Effective date: Dec 22, 2025 Announcement date: Dec 5, 2025 S&P 500 label: 500 +3 more

6 metrics

Effective date Dec 22, 2025 Index changes effective before open on this date

Announcement date Dec 5, 2025 Press release publication date

S&P 500 label 500 Index name for large-cap benchmark

S&P MidCap 400 label 400 Index name for mid-cap benchmark

S&P SmallCap 600 label 600 Index name for small-cap benchmark

First index year 1884 Year Charles Dow created first index mentioned

Historical Context

5 past events · Latest: Feb 19 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Feb 19	Earnings results	Positive	+6.5%	Reported strong Q4 and FY2025 revenue, net income, cash flow and backlog.
Feb 19	Dividend increase	Positive	+6.5%	Raised quarterly dividend per share with payment and record dates disclosed.
Feb 12	Earnings call setup	Neutral	+2.9%	Announced schedule and access details for Q4 and FY2025 call and webcast.
Dec 19	Leadership changes	Neutral	+1.1%	Outlined year-end leadership transitions including new president and legal succession.
Nov 21	Board appointments	Neutral	+2.0%	Fortis Construction added directors including a Comfort Systems executive to its board.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Recent earnings, dividend, and governance updates all saw positive single-day price reactions.

Recent Company History

Over the past several months, Comfort Systems USA has reported strong fundamentals and stable governance. Q4 and full-year 2025 results on Feb 19, 2026 showed multi-billion revenue, over $1B net income, and a backlog near $11.94B, with shares rising 6.46%. A dividend increase the same day also aligned with that move. Management transitions announced on Dec 19, 2025 and board-related news in November 2025 drew modest positive reactions, reinforcing a pattern of constructive responses to corporate developments.

Key Terms

s&p 500, s&p midcap 400, s&p smallcap 600, gics sector

4 terms

s&p 500 financial

"CRH, Carvana and Comfort Systems USA Set to Join S&P 500; Others..."

The S&P 500 is a broad stock market index that tracks the performance of 500 large U.S. companies, weighted so bigger firms have a larger impact. Investors use it like a thermometer or benchmark to judge how the overall U.S. stock market or a portfolio is doing; movements in the index influence investor sentiment, fund performance, and many passive investment products that aim to match its returns.

View in glossary

s&p midcap 400 financial

"changes to the S&P 500, S&P MidCap 400, and S&P SmallCap 600 indices"

The S&P MidCap 400 is a group of 400 companies that are smaller than the big, well-known corporations but larger than tiny startups. It helps investors see how medium-sized companies are performing in the stock market, acting like a barometer for this middle-sized group of businesses.

s&p smallcap 600 financial

"changes to the S&P 500, S&P MidCap 400, and S&P SmallCap 600 indices"

A stock market index made up of 600 small-cap U.S. companies chosen to represent the performance of smaller publicly traded firms. It matters to investors because it acts like a temperature gauge for the small-company segment of the market, serving as a benchmark for fund managers, a basis for index funds and ETFs, and a way to compare returns and risk when building a diversified portfolio.

gics sector financial

"Ticker | GICS Sector"

GICS sector is one of the major industry groupings from the Global Industry Classification Standard, a system that sorts companies into consistent categories (like Technology or Health Care) based on the primary business they do. Investors use these sectors like folders in a filing cabinet to compare companies, build diversified portfolios, and track how whole parts of the market are performing rather than focusing on single stocks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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NEW YORK, Dec. 5, 2025 /PRNewswire/ -- S&P Dow Jones Indices ("S&P DJI") will make the following changes to the S&P 500, S&P MidCap 400, and S&P SmallCap 600 indices effective prior to the open of trading on Monday, December 22, to coincide with the quarterly rebalance. The changes ensure that 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
Dec 22, 2025	S&P 500	Addition	CRH	CRH	Materials
Dec 22, 2025	S&P 500	Addition	Carvana	CVNA	Consumer Discretionary
Dec 22, 2025	S&P 500	Addition	Comfort Systems USA	FIX	Industrials
Dec 22, 2025	S&P 500	Deletion	LKQ	LKQ	Consumer Discretionary
Dec 22, 2025	S&P 500	Deletion	Solstice Advanced Materials	SOLS	Materials
Dec 22, 2025	S&P 500	Deletion	Mohawk Industries	MHK	Consumer Discretionary
Dec 22, 2025	S&P MidCap 400	Addition	UL Solutions	ULS	Industrials
Dec 22, 2025	S&P MidCap 400	Addition	Pinterest	PINS	Communication Services
Dec 22, 2025	S&P MidCap 400	Addition	Booz Allen Hamilton Holding	BAH	Industrials
Dec 22, 2025	S&P MidCap 400	Addition	SPX Technologies	SPXC	Industrials
Dec 22, 2025	S&P MidCap 400	Addition	Dycom Industries	DY	Industrials
Dec 22, 2025	S&P MidCap 400	Addition	Borgwarner	BWA	Consumer Discretionary
Dec 22, 2025	S&P MidCap 400	Addition	Hecla Mining Co	HL	Materials
Dec 22, 2025	S&P MidCap 400	Deletion	Comfort Systems USA	FIX	Industrials
Dec 22, 2025	S&P MidCap 400	Deletion	Under Armour A	UAA	Consumer Discretionary
Dec 22, 2025	S&P MidCap 400	Deletion	Under Armour C	UA	Consumer Discretionary
Dec 22, 2025	S&P MidCap 400	Deletion	Power Integrations	POWI	Information Technology
Dec 22, 2025	S&P MidCap 400	Deletion	Perrigo Company	PRGO	Health Care
Dec 22, 2025	S&P MidCap 400	Deletion	Iridium Communications	IRDM	Communication Services
Dec 22, 2025	S&P MidCap 400	Deletion	Marriott Vacations Worldwide	VAC	Consumer Discretionary
Dec 22, 2025	S&P MidCap 400	Deletion	Insperity	NSP	Industrials
Dec 22, 2025	S&P SmallCap 600	Addition	Primoris Services	PRIM	Industrials
Dec 22, 2025	S&P SmallCap 600	Addition	Casella Waste Systems	CWST	Industrials
Dec 22, 2025	S&P SmallCap 600	Addition	Indivior	INDV	Health Care
Dec 22, 2025	S&P SmallCap 600	Addition	Hawaiian Electric Industries	HE	Utilities
Dec 22, 2025	S&P SmallCap 600	Addition	LKQ	LKQ	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Addition	Solstice Advanced Materials	SOLS	Materials
Dec 22, 2025	S&P SmallCap 600	Addition	Mohawk Industries	MHK	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Addition	Under Armour A	UAA	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Addition	Under Armour C	UA	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Addition	Power Integrations	POWI	Information Technology
Dec 22, 2025	S&P SmallCap 600	Addition	Perrigo Company	PRGO	Health Care
Dec 22, 2025	S&P SmallCap 600	Addition	Iridium Communications	IRDM	Communication Services
Dec 22, 2025	S&P SmallCap 600	Addition	Marriott Vacations Worldwide	VAC	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Addition	Insperity	NSP	Industrials
Dec 22, 2025	S&P SmallCap 600	Deletion	SPX Technologies	SPXC	Industrials
Dec 22, 2025	S&P SmallCap 600	Deletion	Dycom Industries	DY	Industrials
Dec 22, 2025	S&P SmallCap 600	Deletion	Borgwarner	BWA	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Deletion	Hecla Mining Co	HL	Materials
Dec 22, 2025	S&P SmallCap 600	Deletion	Ready Capital	RC	Financials
Dec 22, 2025	S&P SmallCap 600	Deletion	SITE Centers	SITC	Real Estate
Dec 22, 2025	S&P SmallCap 600	Deletion	Thryv Holdings	THRY	Communication Services
Dec 22, 2025	S&P SmallCap 600	Deletion	Helen of Troy	HELE	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Deletion	AdvanSix	ASIX	Materials
Dec 22, 2025	S&P SmallCap 600	Deletion	Sturm Ruger & Co	RGR	Consumer Discretionary
Dec 22, 2025	S&P SmallCap 600	Deletion	MGP Ingredients	MGPI	Consumer Staples
Dec 22, 2025	S&P SmallCap 600	Deletion	Ceva	CEVA	Information Technology
Dec 22, 2025	S&P SmallCap 600	Deletion	Shoe Carnival	SCVL	Consumer Discretionary

ABOUT S&P DOW JONES INDICES

S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data and research, and home to iconic financial market indicators, such as the S&P 500® and the Dow Jones Industrial Average®. More assets are invested in products based on our indices than products based on indices from any other provider in the world. Since Charles Dow invented the first index in 1884, S&P DJI has been innovating and developing indices across the spectrum of asset classes helping to define the way investors measure and trade the markets.

S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI), which provides essential intelligence for individuals, companies, and governments to make decisions with confidence. For more information, visit www.spglobal.com/spdji/en/. 

FOR MORE INFORMATION:

S&P Dow Jones Indices
index_services@spglobal.com

Media Inquiries
spdji.comms@spglobal.com

View original content:https://www.prnewswire.com/news-releases/crh-carvana-and-comfort-systems-usa-set-to-join-sp-500-others-to-join-sp-midcap-400-and-sp-smallcap-600-302634487.html

SOURCE S&P Dow Jones Indices

FAQ

When will Dycom (DY) join the S&P MidCap 400?

Dycom (DY) will join the S&P MidCap 400 prior to the open on Dec 22, 2025. According to S&P Dow Jones Indices, the move occurs as part of the quarterly rebalance to align constituents with market-cap ranges.

Which companies will join the S&P 500 on Dec 22, 2025?

CRH, Carvana (CVNA) and Comfort Systems USA (FIX) will join the S&P 500 on Dec 22, 2025. According to S&P Dow Jones Indices, these additions follow the quarterly reconstitution to better reflect the S&P 500 market-cap profile.

What happens to Dycom (DY) in the S&P SmallCap 600 reconstitution?

Dycom (DY) will be removed from the S&P SmallCap 600 prior to the open on Dec 22, 2025. According to S&P Dow Jones Indices, the company no longer fits the small-cap market-cap range and is being reclassified to MidCap.

How does S&P Dow Jones Indices decide Dec 22, 2025 index changes?

S&P Dow Jones Indices applies quarterly rebalance rules and market-cap criteria to make changes effective Dec 22, 2025. According to S&P Dow Jones Indices, the goal is to ensure each index better represents its intended market-cap segment.

Which firms are being removed from the S&P 500 on Dec 22, 2025?

LKQ, Solstice Advanced Materials and Mohawk Industries are being deleted from the S&P 500 on Dec 22, 2025. According to S&P Dow Jones Indices, these deletions accompany the additions to maintain index composition and weighting.

Will companies move between S&P SmallCap 600 and S&P MidCap 400 on Dec 22, 2025?

Yes. Several companies, including Dycom (DY) moving to MidCap and others moving into SmallCap, will be reclassified on Dec 22, 2025. According to S&P Dow Jones Indices, these changes reflect updated market-cap measurements at rebalance.