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 – LW

-0.61%

-0.61% Session close to close

In the Mar 9 session, LW declined 0.61%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement details S&P index rebalancing that shifts Lamb Weston from the S&P 500 to the S&P ...

Analysis

This announcement details S&P index rebalancing that shifts Lamb Weston from the S&P 500 to the S&P SmallCap 600, a mechanical change that can affect benchmark-driven ownership. The stock had been trading below its 200-day MA of $52.36 and 36.96% under its $67.07 52-week high, following a -8.94% move on Q3 2026 results. Investors may watch how passive flows, future earnings, and ongoing cost initiatives interact with this new index placement.

Key Figures

Effective date: March 13, 2026 Rebalance date: March 23, 2026 Index addition: S&P 500 +1 more

4 metrics

Effective date March 13, 2026 Date NSSC replaces ALEX in S&P SmallCap 600

Rebalance date March 23, 2026 Quarterly rebalance effective date for S&P indices

Index addition S&P 500 LW to be deleted from S&P 500 and moved to S&P SmallCap 600

Index addition S&P SmallCap 600 LW added to S&P SmallCap 600 effective March 23, 2026

Historical Context

5 past events · Latest: Apr 01 (Negative)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Apr 01	Q3 2026 earnings	Negative	-8.9%	Higher sales but sharply lower profits and reduced capex with guidance update.
Mar 09	Activist letter	Positive	-0.6%	Starboard urged cost cuts and strategic review to enhance shareholder value.
Mar 04	Earnings date notice	Neutral	-1.9%	Announcement of timing for Q3 fiscal 2026 results and conference call.
Feb 06	Inducement award	Neutral	+1.1%	Executive inducement RSUs and options tied to new Executive Chair hire.
Feb 04	Leadership changes	Positive	+3.2%	New Executive Chair and CFO plus equity incentives, with guidance reiterated.

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

Pattern Detected

Recent news has often been followed by notable downside, even on mixed or strategic updates, with occasional positive reactions to leadership and governance changes.

Recent Company History

Over the last six months, Lamb Weston has reported softer profitability despite higher sales, as highlighted in the April 1, 2026 Q3 results and guidance update, which saw a -8.94% reaction. Activist engagement from Starboard on March 9, 2026 and leadership changes announced on February 4, 2026 underscored a focus on cost savings and strategy, with leadership news drawing a 3.22% gain. Inducement equity awards and the earnings-date notice had relatively modest price impacts.

Key Terms

S&P 500, S&P 100, S&P MidCap 400, S&P SmallCap 600, +1 more

5 terms

S&P 500 financial

"Vertiv Holdings, Lumentum Holdings, Coherent, and EchoStar 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 100 financial

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

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 MidCap 400 financial

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

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. 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

"Effective Date | Index Name | Action | 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.