Gulfport Energy and Mobility Global Set to Join S&P SmallCap 600

Rhea-AI Summary

Core Laboratories (NYSE: CLB) will be removed from the S&P SmallCap 600 prior to the open on July 2, 2026, and replaced by Mobility Global (NYSE: MBGL).

According to S&P Dow Jones Indices, Core Laboratories is no longer representative of the small-cap market space.

Positive

• None.

Negative

• Core Laboratories (CLB) deleted from S&P SmallCap 600 on July 2, 2026

News Market Reaction – SPGI

+0.10%

+0.10% Session close to close

In the Jun 29 session, SPGI gained 0.10%, reflecting a mild positive market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement highlights S&P Dow Jones Indices’ role in rebalancing the S&P SmallCap 600 and con...

Analysis

This announcement highlights S&P Dow Jones Indices’ role in rebalancing the S&P SmallCap 600 and connects to SPGI’s Mobility Global spin-off. Investors may watch execution of the separation and funding structure, including the $2.0 billion notes and credit facility.

Key Figures

Private notes offering: $2.0 billion Revolving credit facility: $500 million Spin-off distribution: 100% of Mobility Global stock +4 more

7 metrics

Private notes offering $2.0 billion Mobility Global senior notes ahead of spin-off

Revolving credit facility $500 million Mobility Global senior unsecured revolver

Spin-off distribution 100% of Mobility Global stock Pro rata distribution to SPGI shareholders

Distribution ratio 1 share for 1 share One Mobility Global share per SPGI share

Distribution time 12:01 a.m. July 1, 2026 Expected spin-off distribution time in New York

RSU grant 4,115 restricted stock units Equity award to CTO & Transformation Officer

RSU grant 2,743 restricted stock units Second equity award to CTO & Transformation Officer

Historical Context

5 past events · Latest: Jun 24 (Neutral)

5 events

Date	Event	Sentiment	24h Move	Catalyst
Jun 24	Index change	Neutral	-1.8%	NETSTREIT added to S&P SmallCap 600, replacing ProAssurance after its pending acquisition.
Jun 24	Environmental report	Neutral	+0.6%	SPGI unit reported continued decline in Canadian oil sands greenhouse gas intensity since 2009.
Jun 23	Index change	Neutral	+0.6%	Alphabet to join Dow Jones Industrial Average, replacing Verizon due to index rebalancing.
Jun 22	Dividend declaration	Neutral	-1.8%	SPGI declared a Q3 2026 cash dividend with stated annualized rate and long payment history.
Jun 22	Workplace recognition	Neutral	-0.8%	CARFAX, an SPGI business, received Top Workplace honors in both of its U.S. hub cities.

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

Key Terms

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

3 terms

s&p smallcap 600 financial

"July 1, 2026 | S&P SmallCap 600 | Addition | Gulfport Energy"

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.

s&p 500 financial

"S&P 500 constituent S&P Global Inc. (NYSE: SPGI) is spinning off Mobility Global"

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

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, June 26, 2026 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P SmallCap 600:

• Gulfport Energy Corp. (NYSE: GPOR) will replace Select Medical Holdings Corp. (NYSE: SEM) effective prior to the opening of trading on Wednesday, July 1.  Select Medical Holdings is being acquired in a deal expected to be completed soon, pending final closing conditions.
  
  
• Mobility Global Inc. (NYSE: MBGL) will replace Core Laboratories Inc. (NYSE: CLB) effective prior to the opening of trading on Thursday, July 2. S&P 500 constituent S&P Global Inc. (NYSE: SPGI) is spinning off Mobility Global in a transaction expected to be completed July 1. Core Laboratories is 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
July 1, 2026	S&P SmallCap 600	Addition	Gulfport Energy	GPOR	Energy
July 1, 2026	S&P SmallCap 600	Deletion	Select Medical Holdings	SEM	Health Care
July 2, 2026	S&P SmallCap 600	Addition	Mobility Global	MBGL	Industrials
July 2, 2026	S&P SmallCap 600	Deletion	Core Laboratories	CLB	Energy

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/gulfport-energy-and-mobility-global-set-to-join-sp-smallcap-600-302812407.html

SOURCE S&P Dow Jones Indices

FAQ

When will Core Laboratories (NYSE: CLB) be removed from the S&P SmallCap 600 index?

Core Laboratories is set to be removed from the S&P SmallCap 600 before trading opens on July 2, 2026. According to S&P Dow Jones Indices, this change follows a scheduled index rebalancing that also adds Mobility Global to the index.

Why is Core Laboratories (CLB) being deleted from the S&P SmallCap 600?

Core Laboratories is being deleted because it is described as no longer representative of the small-cap market space. According to S&P Dow Jones Indices, this adjustment is part of index maintenance to keep the S&P SmallCap 600 aligned with its small-cap exposure objective.

Which company will replace Core Laboratories (CLB) in the S&P SmallCap 600?

Mobility Global (NYSE: MBGL) will replace Core Laboratories in the S&P SmallCap 600. According to S&P Dow Jones Indices, MBGL will be added to the index prior to the opening of trading on July 2, 2026, when CLB is simultaneously deleted.

How could the S&P SmallCap 600 deletion affect Core Laboratories (CLB) shareholders?

Deletion from the S&P SmallCap 600 can reduce automatic index-fund ownership of Core Laboratories shares. According to S&P Dow Jones Indices, CLB will be removed July 2, 2026, which may influence trading volumes and demand from small-cap index and ETF investors.

What other index changes are happening when Core Laboratories (CLB) leaves the S&P SmallCap 600?

Alongside Core Laboratories’ removal on July 2, 2026, Mobility Global will be added to the S&P SmallCap 600. According to S&P Dow Jones Indices, Gulfport Energy will also join the index on July 1, replacing Select Medical Holdings, which is being acquired.