Vertiv Holdings, Lumentum Holdings, Coherent, and EchoStar Set to Join S&P 500; Others to Join S&P 100, S&P MidCap 400, and S&P SmallCap 600

Rhea-AI Summary

S&P Dow Jones Indices announced index membership changes effective Mar 13 and Mar 23, 2026, moving multiple companies across the S&P 100, S&P 500, S&P MidCap 400 and S&P SmallCap 600.

Notable moves: Vertiv (VRT), Lumentum (LITE), Coherent (COHR), EchoStar (SATS) are added to the S&P 500 on Mar 23, while Lamb Weston (LW) is removed from the S&P 500 and moved to the S&P SmallCap 600 on the same date.

Positive

• 4 companies added to S&P 500 effective Mar 23, 2026
• Index rebalancing aims to better reflect market-cap ranges on Mar 23

Negative

• Lamb Weston (LW) removed from S&P 500 effective Mar 23, 2026
• Multiple deletions from S&P 100 and MidCap 400 may reduce index exposure

News Market Reaction – AGX

+12.60%

4 alerts

+12.60% Session close to close

$5.97B Market Cap

0.0x Rel. Volume

In the Mar 9 session, AGX gained 12.60%, reflecting a significant positive market reaction. Our momentum scanner triggered 4 alerts that day, indicating moderate trading interest and price volatility.

Data tracked by StockTitan Argus on the day of publication.

Market Context

The stock surged +12.6% in the session following this news. A strong positive reaction aligns with t...

Analysis

The stock surged +12.6% in the session following this news. A strong positive reaction aligns with the significance of index inclusion news and Argan’s recent operating strength. The company had just reported record FY2026 results with revenue of $944.6M and robust cash levels, and expanded its buyback to $200M. Past events such as the 37.91% move on earnings show that large upside reactions have occurred before, though investors would need to weigh how much of the index change impact was already reflected in the pre-news price.

Key Figures

Current price: $598.44 Price change 24h: -0.89% 52-week high: $618.8682 +5 more

8 metrics

Current price $598.44 AGX pre-news trading level

Price change 24h -0.89% Move vs prior close before index change news

52-week high $618.8682 Upper end of 1-year trading range

52-week low $126.07 Lower end of 1-year trading range

Market capitalization $8,421,129,694 Equity value before index inclusion

Volume today 256,890 shares Trading volume on news date

20-day avg volume 621,505 shares Liquidity benchmark for AGX

200-day moving average $326.01 Long-term trend reference

Historical Context

5 past events · Latest: Apr 08 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Apr 08	Capital return update	Positive	+3.6%	Expanded buyback to $200M and maintained $0.50 quarterly dividend.
Mar 26	Earnings report	Positive	+37.9%	Record FY2026 revenue $944.6M, EPS $9.74, strong cash and backlog.
Mar 12	Earnings date notice	Neutral	-2.9%	Announced timing and access details for Q4 and FY2026 results call.
Dec 11	Dividend declaration	Positive	-3.2%	Confirmed $0.50 quarterly dividend and highlighted prior dividend increases.
Dec 04	Quarterly results	Neutral	-12.0%	Reported Q3 FY2026 results with $3.0B backlog and no debt.

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

Pattern Detected

Positive corporate actions and strong earnings have often coincided with favorable price reactions, though dividend news has not always been rewarded.

Recent Company History

Over the last six months, Argan has reported strong operating and financial trends. Q3 FY2026 results on Dec 4, 2025 included a $3.0B backlog and higher dividends but saw a -11.98% reaction. A regular quarterly dividend on Dec 11, 2025 coincided with a -3.23% move. By Mar 26, 2026, record FY2026 results with $944.6M revenue and $9.74 EPS drove a strong 37.91% gain. The Apr 8, 2026 buyback and dividend expansion produced a further 3.57% rise, supporting a narrative of improving fundamentals and shareholder returns.

Key Terms

s&p 100, s&p 500, s&p midcap 400, s&p smallcap 600, +1 more

5 terms

s&p 100 financial

"changes to the S&P 100, S&P 500, S&P MidCap 400, and S&P SmallCap 600"

The S&P 100 is a stock market index that tracks the shares of 100 large, well‑established U.S. companies selected for size and ease of trading; think of it as a basket representing the biggest, most widely traded American firms. Investors use it as a quick read on how large‑cap, blue‑chip stocks are performing and as a benchmark for funds and derivatives; like checking the temperature of the largest businesses, movements in the index can influence portfolio choices and risk management.

s&p 500 financial

"set to join S&P 500; Others to Join S&P 100, S&P MidCap 400"

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 100, S&P 500, S&P MidCap 400, and S&P SmallCap 600"

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

"NAPCO Security Technologies Inc. (NASD: NSSC) will replace Alexander & Baldwin Inc. (NYSE: ALEX) in the S&P SmallCap 600"

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

"Company Name | 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, March 6, 2026 /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:

• NAPCO Security Technologies Inc. (NASD: NSSC) will replace Alexander & Baldwin Inc. (NYSE: ALEX) in the S&P SmallCap 600 effective prior to the opening of trading on Friday, March 13. An investor group comprised of MW Group and funds affiliated with DivcoWest and Blackstone Real Estate is acquiring Alexander & Baldwin in a deal that is expected to close soon, pending final closing conditions.
  
  
• The following changes to the S&P 100, S&P 500, S&P MidCap 400, and S&P SmallCap 600 will take effect before the market opens on Monday, March 23, as part of 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
Mar 13, 2026	S&P SmallCap 600	Addition	NAPCO Security Technologies	NSSC	Information Technology
Mar 13, 2026	S&P SmallCap 600	Deletion	Alexander & Baldwin	ALEX	Real Estate
Mar 23, 2026	S&P 100	Addition	Micron Technology	MU	Information Technology
Mar 23, 2026	S&P 100	Addition	Lam Research	LRCX	Information Technology
Mar 23, 2026	S&P 100	Addition	Applied Materials	AMAT	Information Technology
Mar 23, 2026	S&P 100	Addition	GE Vernova	GEV	Industrials
Mar 23, 2026	S&P 100	Deletion	PayPal Holdings	PYPL	Financials
Mar 23, 2026	S&P 100	Deletion	American Intl Group	AIG	Financials
Mar 23, 2026	S&P 100	Deletion	Metlife	MET	Financials
Mar 23, 2026	S&P 100	Deletion	Target	TGT	Consumer Staples
Mar 23, 2026	S&P 500	Addition	Vertiv Holdings	VRT	Industrials
Mar 23, 2026	S&P 500	Addition	Lumentum Holdings	LITE	Information Technology
Mar 23, 2026	S&P 500	Addition	Coherent	COHR	Information Technology
Mar 23, 2026	S&P 500	Addition	EchoStar	SATS	Communication Services
Mar 23, 2026	S&P 500	Deletion	Match Group	MTCH	Communication Services
Mar 23, 2026	S&P 500	Deletion	Molina Healthcare	MOH	Health Care
Mar 23, 2026	S&P 500	Deletion	Lamb Weston Holdings	LW	Consumer Staples
Mar 23, 2026	S&P 500	Deletion	Paycom Software	PAYC	Industrials
Mar 23, 2026	S&P MidCap 400	Addition	Solstice Advanced Materials	SOLS	Materials
Mar 23, 2026	S&P MidCap 400	Addition	SiTime	SITM	Information Technology
Mar 23, 2026	S&P MidCap 400	Addition	Moog	MOG.A	Industrials
Mar 23, 2026	S&P MidCap 400	Addition	InterDigital	IDCC	Information Technology
Mar 23, 2026	S&P MidCap 400	Addition	Vicor	VICR	Industrials
Mar 23, 2026	S&P MidCap 400	Addition	CareTrust REIT	CTRE	Real Estate
Mar 23, 2026	S&P MidCap 400	Deletion	Lumentum Holdings	LITE	Information Technology
Mar 23, 2026	S&P MidCap 400	Deletion	Coherent	COHR	Information Technology
Mar 23, 2026	S&P MidCap 400	Deletion	EchoStar	SATS	Communication Services
Mar 23, 2026	S&P MidCap 400	Deletion	ZoomInfo Technologies	GTM	Communication Services
Mar 23, 2026	S&P MidCap 400	Deletion	ASGN	ASGN	Information Technology
Mar 23, 2026	S&P MidCap 400	Deletion	Kemper	KMPR	Financials
Mar 23, 2026	S&P SmallCap 600	Addition	Match Group	MTCH	Communication Services
Mar 23, 2026	S&P SmallCap 600	Addition	Molina Healthcare	MOH	Health Care
Mar 23, 2026	S&P SmallCap 600	Addition	Lamb Weston Holdings	LW	Consumer Staples
Mar 23, 2026	S&P SmallCap 600	Addition	Paycom Software	PAYC	Industrials
Mar 23, 2026	S&P SmallCap 600	Addition	VSE	VSEC	Industrials
Mar 23, 2026	S&P SmallCap 600	Addition	Argan	AGX	Industrials
Mar 23, 2026	S&P SmallCap 600	Addition	Rithm Capital	RITM	Financials
Mar 23, 2026	S&P SmallCap 600	Addition	Lyft	LYFT	Industrials
Mar 23, 2026	S&P SmallCap 600	Addition	Laureate Education	LAUR	Consumer Discretionary
Mar 23, 2026	S&P SmallCap 600	Addition	Life Time Group Holdings	LTH	Consumer Discretionary
Mar 23, 2026	S&P SmallCap 600	Addition	Life360	LIF	Information Technology
Mar 23, 2026	S&P SmallCap 600	Addition	Sphere Entertainment	SPHR	Communication Services
Mar 23, 2026	S&P SmallCap 600	Addition	ZoomInfo Technologies	GTM	Communication Services
Mar 23, 2026	S&P SmallCap 600	Addition	ASGN	ASGN	Information Technology
Mar 23, 2026	S&P SmallCap 600	Addition	Kemper	KMPR	Financials
Mar 23, 2026	S&P SmallCap 600	Deletion	Solstice Advanced Materials	SOLS	Materials
Mar 23, 2026	S&P SmallCap 600	Deletion	SiTime	SITM	Information Technology
Mar 23, 2026	S&P SmallCap 600	Deletion	Moog	MOG.A	Industrials
Mar 23, 2026	S&P SmallCap 600	Deletion	InterDigital	IDCC	Information Technology
Mar 23, 2026	S&P SmallCap 600	Deletion	Vicor Corp	VICR	Industrials
Mar 23, 2026	S&P SmallCap 600	Deletion	CareTrust REIT	CTRE	Real Estate
Mar 23, 2026	S&P SmallCap 600	Deletion	Dave & Buster's Entertainment	PLAY	Consumer Discretionary
Mar 23, 2026	S&P SmallCap 600	Deletion	SunCoke Energy	SXC	Materials
Mar 23, 2026	S&P SmallCap 600	Deletion	AH Realty Trust	AHRT	Real Estate
Mar 23, 2026	S&P SmallCap 600	Deletion	Summit Hotel Properties	INN	Real Estate
Mar 23, 2026	S&P SmallCap 600	Deletion	KKR Real Estate Finance Trust	KREF	Financials
Mar 23, 2026	S&P SmallCap 600	Deletion	Bloomin' Brands	BLMN	Consumer Discretionary
Mar 23, 2026	S&P SmallCap 600	Deletion	Myriad Genetics	MYGN	Health Care
Mar 23, 2026	S&P SmallCap 600	Deletion	Cars.com	CARS	Communication Services
Mar 23, 2026	S&P SmallCap 600	Deletion	ANGI	ANGI	Communication Services

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/vertiv-holdings-lumentum-holdings-coherent-and-echostar-set-to-join-sp-500-others-to-join-sp-100-sp-midcap-400-and-sp-smallcap-600-302707297.html

SOURCE S&P Dow Jones Indices

FAQ

Which companies are joining the S&P 500 on Mar 23, 2026 (symbol LW mentioned)?

The S&P 500 additions on Mar 23, 2026 are Vertiv (VRT), Lumentum (LITE), Coherent (COHR), and EchoStar (SATS). According to S&P DJI, these changes take effect before the market opens on Mar 23, 2026 as part of the quarterly rebalance.

What happens to Lamb Weston (LW) in the S&P reconstitution on Mar 23, 2026?

Lamb Weston (LW) will be deleted from the S&P 500 and added to the S&P SmallCap 600 effective Mar 23, 2026. According to S&P DJI, the move reflects that LW is no longer representative of the S&P 500 market-cap range.

How will the Mar 13, 2026 change affect NAPCO Security Technologies (NSSC)?

NAPCO Security Technologies (NSSC) will be added to the S&P SmallCap 600 effective prior to trading on Mar 13, 2026. According to S&P DJI, NSSC replaces Alexander & Baldwin, which is being acquired and is expected to be removed.

Which S&P 100 companies are being removed and added on Mar 23, 2026?

On Mar 23, 2026, S&P 100 additions include Micron (MU), Lam Research (LRCX), Applied Materials (AMAT), and GE Vernova (GEV); deletions include PayPal (PYPL), AIG (AIG), MetLife (MET), and Target (TGT). According to S&P DJI, changes align index membership with market-cap ranges.

Will these index changes affect index-tracking funds and ETFs for LW and others?

Yes. Index-tracking funds and ETFs that replicate the S&P 500 or SmallCap 600 will rebalance holdings to reflect these Mar 13 and Mar 23 changes. According to S&P DJI, funds typically adjust before market open on the effective dates to match index membership.