Marvell Technology and Flex Set to Join S&P 500; Others to Join S&P MidCap 400 and S&P SmallCap 600

Rhea-AI Summary

Coeur Mining (NYSE:CDE) will be added to the S&P MidCap 400, effective before the market opens on June 22, 2026, as part of S&P Dow Jones Indices’ quarterly rebalance.

CDE will join the index’s Materials sector, replacing BellRing Brands.

Positive

• Coeur Mining to join S&P MidCap 400 on June 22, 2026
• CDE classified in Materials sector within S&P MidCap 400
• Addition occurs as part of official S&P quarterly index rebalance

Negative

• None.

News Market Reaction – LAZ

-1.34%

3 alerts

-1.34% Session close to close

+2.6% Peak Tracked

$4.56B Market Cap

0.0x Rel. Volume

In the Jun 8 session, LAZ declined 1.34%, reflecting a mild negative market reaction. Argus tracked a peak move of +2.6% during that session. Our momentum scanner triggered 3 alerts that day, indicating moderate trading interest and price volatility.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement details upcoming S&P index rebalancing effective June 22, 2026, including Lazard’s...

Analysis

This announcement details upcoming S&P index rebalancing effective June 22, 2026, including Lazard’s addition to the S&P SmallCap 600. Contextually, recent company news ranged from earnings and AUM updates to leadership changes, with mixed short-term price responses and 2 divergences following constructive headlines. Regulatory filings highlight deferred and restricted stock awards plus net insider selling over the last 90 days. Observers may track how these index changes interact with Lazard’s ongoing operational and capital‑markets developments.

Key Figures

Index change effective date: June 22, 2026

1 metrics

Index change effective date June 22, 2026 Rebalancing date for S&P index additions and deletions

Historical Context

5 past events · Latest: May 22 (Neutral)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
May 22	Fund distribution	Neutral	+1.8%	Global Total Return and Income Fund declared a monthly cash distribution.
May 22	Conference appearance	Positive	+0.8%	CEO and Chairman scheduled for a fireside discussion at a major conference.
May 12	AUM update	Positive	+0.2%	Reported April 2026 AUM with contributions from market and FX appreciation and inflows.
May 4	Senior advisor hire	Positive	-3.0%	Hired experienced senior advisor to bolster Power, Energy & Infrastructure expertise.
May 1	Q1 2026 earnings	Positive	-7.0%	Reported higher net revenue and AUM with mixed segment trends and shareholder returns.

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

Pattern Detected

Recent news often drew modest positive reactions, but some fundamentally oriented updates (notably earnings and a senior advisor hire) coincided with negative price moves, indicating occasional divergence between operational headlines and trading response.

Recent Company History

Over the last several weeks, Lazard’s news flow has centered on distributions, conferences, assets under management, hiring, and earnings. A fund distribution on May 22 and a CEO conference appearance the same day both saw modest gains. An April AUM update on May 12 also aligned with a small uptick. By contrast, a senior advisor hire on May 4 and Q1 2026 results on May 1 were followed by declines, showing that even constructive corporate developments have sometimes coincided with short-term selling.

Key Terms

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

4 terms

s&p 500 financial

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

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, June 5, 2026 /PRNewswire/ -- S&P Dow Jones Indices 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, June 22, 2026, 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 S&P MidCap 400 and S&P SmallCap 600 are no longer representative of the mid-cap and small-cap market space, respectively. 

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
June 22, 2026	S&P 500	Addition	Marvell Technology	MRVL	Information Technology
June 22, 2026	S&P 500	Deletion	Pool Corp	POOL	Consumer Discretionary
June 22, 2026	S&P 500	Addition	Flex	FLEX	Information Technology
June 22, 2026	S&P 500	Deletion	The Campbell's Company	CPB	Consumer Staples
June 22, 2026	S&P MidCap 400	Addition	Roku	ROKU	Communication Services
June 22, 2026	S&P MidCap 400	Deletion	Flex	FLEX	Information Technology
June 22, 2026	S&P MidCap 400	Addition	Coeur Mining	CDE	Materials
June 22, 2026	S&P MidCap 400	Deletion	BellRing Brands	BRBR	Consumer Staples
June 22, 2026	S&P MidCap 400	Addition	Semtech	SMTC	Information Technology
June 22, 2026	S&P MidCap 400	Deletion	Coty	COTY	Consumer Staples
June 22, 2026	S&P MidCap 400	Addition	Sanmina	SANM	Information Technology
June 22, 2026	S&P MidCap 400	Deletion	Concentrix	CNXC	Industrials
June 22, 2026	S&P MidCap 400	Addition	Viavi Solutions	VIAV	Information Technology
June 22, 2026	S&P MidCap 400	Deletion	Blackbaud	BLKB	Information Technology
June 22, 2026	S&P SmallCap 600	Addition	Pool	POOL	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Deletion	Embecta	EMBC	Health Care
June 22, 2026	S&P SmallCap 600	Addition	The Campbell's Company	CPB	Consumer Staples
June 22, 2026	S&P SmallCap 600	Deletion	Universal Health Realty Trust	UHT	Real Estate
June 22, 2026	S&P SmallCap 600	Addition	Coty	COTY	Consumer Staples
June 22, 2026	S&P SmallCap 600	Deletion	Semtech	SMTC	Information Technology
June 22, 2026	S&P SmallCap 600	Addition	Concentrix	CNXC	Industrials
June 22, 2026	S&P SmallCap 600	Deletion	Sanmina	SANM	Information Technology
June 22, 2026	S&P SmallCap 600	Addition	Blackbaud	BLKB	Information Technology
June 22, 2026	S&P SmallCap 600	Deletion	Viavi Solutions	VIAV	Information Technology
June 22, 2026	S&P SmallCap 600	Addition	Credit Acceptance	CACC	Financials
June 22, 2026	S&P SmallCap 600	Deletion	Oxford Industries	OXM	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Addition	Lazard	LAZ	Financials
June 22, 2026	S&P SmallCap 600	Deletion	Gogo	GOGO	Communication Services
June 22, 2026	S&P SmallCap 600	Addition	Eastern Bankshares	EBC	Financials
June 22, 2026	S&P SmallCap 600	Deletion	PRA Group	PRAA	Financials
June 22, 2026	S&P SmallCap 600	Addition	Wesbanco	WSBC	Financials
June 22, 2026	S&P SmallCap 600	Deletion	Insteel Industries	IIIN	Industrials
June 22, 2026	S&P SmallCap 600	Addition	Warby Parker	WRBY	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Deletion	Ethan Allen Interiors	ETD	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Addition	Nicolet Bankshares	NIC	Financials
June 22, 2026	S&P SmallCap 600	Deletion	Cytek Biosciences	CTKB	Health Care
June 22, 2026	S&P SmallCap 600	Addition	Liquidia	LQDA	Health Care
June 22, 2026	S&P SmallCap 600	Deletion	Monro	MNRO	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Addition	Rush Street Interactive	RSI	Consumer Discretionary
June 22, 2026	S&P SmallCap 600	Deletion	Vital Farms	VITL	Consumer Staples
June 22, 2026	S&P SmallCap 600	Addition	United States Lime & Minerals	USLM	Materials
June 22, 2026	S&P SmallCap 600	Deletion	Cable One	CABO	Communication Services
June 22, 2026	S&P SmallCap 600	Addition	InvenTrust Properties	IVT	Real Estate
June 22, 2026	S&P SmallCap 600	Deletion	Forward Air	FWRD	Industrials

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/marvell-technology-and-flex-set-to-join-sp-500-others-to-join-sp-midcap-400-and-sp-smallcap-600-302793159.html

SOURCE S&P Dow Jones Indices

FAQ

When will Coeur Mining (CDE) be added to the S&P MidCap 400 index?

Coeur Mining will be added to the S&P MidCap 400 before trading opens on June 22, 2026. According to S&P Dow Jones Indices, the change aligns with its quarterly index rebalance to keep market capitalization representation accurate.

Why is Coeur Mining (CDE) being included in the S&P MidCap 400?

Coeur Mining is being included to help keep the S&P MidCap 400 representative of its market capitalization range. According to S&P Dow Jones Indices, such changes occur during the quarterly rebalance to better reflect evolving mid-cap market composition.

Which company will Coeur Mining (CDE) replace in the S&P MidCap 400?

Coeur Mining will replace BellRing Brands in the S&P MidCap 400 index. According to S&P Dow Jones Indices, companies removed from the index are described as no longer representative of the mid-cap market space within the index methodology.

How will Coeur Mining (CDE) be classified within the S&P MidCap 400 index?

Coeur Mining will be classified in the Materials sector within the S&P MidCap 400. According to S&P Dow Jones Indices, the company’s sector classification follows the Global Industry Classification Standard (GICS) used across its equity indices.

Is the Coeur Mining (CDE) index change part of a broader S&P rebalance?

Yes, the Coeur Mining addition is part of a broader S&P 500, MidCap 400, and SmallCap 600 quarterly rebalance. According to S&P Dow Jones Indices, these coordinated changes aim to keep each index aligned with its target market capitalization segment.