Alignment Healthcare Set to Join S&P SmallCap 600

Alignment Healthcare (NASD: ALHC) will join the S&P SmallCap 600 effective before trading opens on May 14, 2026, replacing Sun Country Airlines Holdings (NASD: SNCY).

Rhea-AI Summary

Alignment Healthcare (NASD: ALHC) will join the S&P SmallCap 600 effective before trading opens on May 14, 2026, replacing Sun Country Airlines Holdings (NASD: SNCY). The change follows Allegiant Travel (NASD: ALGT) agreeing to acquire Sun Country, pending final closing conditions.

Positive

• Alignment Healthcare (ALHC) added to S&P SmallCap 600 effective May 14, 2026
• Allegiant Travel (ALGT) acquisition of Sun Country expected to close, pending conditions

Negative

• None.

Argus May 12 session

-1.52% close to close Open Argus

Details

News Market Reaction – SNCY

In the May 12 session, SNCY declined 1.52%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement reflects a mechanical index change as Alignment Healthcare joined the S&P SmallCap...

Analysis

This announcement reflects a mechanical index change as Alignment Healthcare joined the S&P SmallCap 600 while Sun Country exited, tied to Allegiant’s pending acquisition. For SNCY, the shift sits within a broader sequence of merger milestones, including regulatory clearances and shareholder approvals expected to culminate around mid‑2026. Investors following this story would focus on transaction closing progress, any remaining conditions, and how integration plans might affect the combined airline’s operational and financial profile.

Historical Context

5 past events · Latest: Apr 20

5 events

1. Apr 20

   Post-merger board plan

   24h Move

   -3.7%

   Allegiant detailed expanded board structure following Sun Country acquisition.

2. Apr 15

   DOT merger approval

   24h Move

   -3.3%

   DOT granted joint interim exemption enabling separate operations under common ownership.

3. Mar 31

   Deal fairness inquiry

   24h Move

   +4.1%

   Discussion of whether ALGT, SNCY and CWAN deals are fair to shareholders.

4. Mar 16

   HSR clearance

   24h Move

   +1.0%

   Early termination of Hart-Scott-Rodino waiting period for Allegiant’s SNCY acquisition.

5. Mar 03

   Schedule extension

   24h Move

   -1.2%

   Sun Country extended its selling schedule through December 15, 2026 for key routes.

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, gics sector, s&p 500, dow jones industrial average

4 terms

s&p smallcap 600 financial

"Alignment Healthcare Inc. (NASD: ALHC) will replace Sun Country Airlines... 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.

s&p 500 financial

"home to iconic financial market indicators, such as the S&P 500® and the Dow Jones Industrial Average®"

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

dow jones industrial average financial

"such as the S&P 500® and the Dow Jones Industrial Average®"

A stock market index that tracks the share prices of a small group of large, well-known companies to give a quick snapshot of how the broader market is doing. Think of it like a thermometer for the stock market: it uses a handful of heavyweight firms as representative samples to show whether investor sentiment is rising or falling, which helps investors gauge market trends and compare performance over time.

View in glossary

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

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NEW YORK, May 11, 2026 /PRNewswire/ -- Alignment Healthcare Inc. (NASD: ALHC) will replace Sun Country Airlines Holdings Inc. (NASD: SNCY) in the S&P SmallCap 600 effective prior to the opening of trading on Thursday, May 14. S&P SmallCap 600 constituent Allegiant Travel Co. (NASD: ALGT) is acquiring Sun Country Airlines Holdings in a deal expected to close soon, pending final closing conditions.

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
May 14, 2026	S&P SmallCap 600	Addition	Alignment Healthcare	ALHC	Health Care
May 14, 2026	S&P SmallCap 600	Deletion	Sun Country Airlines Holdings	SNCY	Industrials

ABOUT S&P DOW JONES INDICES

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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:

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View original content:https://www.prnewswire.com/news-releases/alignment-healthcare-set-to-join-sp-smallcap-600-302768757.html

SOURCE S&P Dow Jones Indices

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

When will Alignment Healthcare (ALHC) be added to the S&P SmallCap 600 index?

Alignment Healthcare will be added to the S&P SmallCap 600 before trading opens on May 14, 2026. According to S&P Dow Jones Indices, ALHC will replace Sun Country Airlines Holdings as part of a scheduled index change.

Which company is Alignment Healthcare (ALHC) replacing in the S&P SmallCap 600?

Alignment Healthcare is replacing Sun Country Airlines Holdings (SNCY) in the S&P SmallCap 600. According to S&P Dow Jones Indices, the change becomes effective prior to the market open on May 14, 2026, coinciding with index rebalancing.

Why is Sun Country Airlines (SNCY) being removed from the S&P SmallCap 600?

Sun Country Airlines is being removed because Allegiant Travel (ALGT) is acquiring the company. According to S&P Dow Jones Indices, the deal is expected to close soon, pending final closing conditions, prompting SNCY’s deletion from the index.

How is Allegiant Travel (ALGT) involved in the S&P SmallCap 600 changes on May 14, 2026?

Allegiant Travel, an existing S&P SmallCap 600 constituent, is acquiring Sun Country Airlines. According to S&P Dow Jones Indices, this pending acquisition leads to SNCY’s removal and Alignment Healthcare’s addition to maintain the index’s composition.

What sector will Alignment Healthcare (ALHC) represent in the S&P SmallCap 600 index?

Alignment Healthcare will represent the Health Care sector in the S&P SmallCap 600. According to S&P Dow Jones Indices, ALHC is being added as a Health Care company when it joins the index effective May 14, 2026.

What is the effective date of the S&P SmallCap 600 changes involving ALHC and SNCY?

The effective date for these index changes is May 14, 2026, before the market opens. According to S&P Dow Jones Indices, Alignment Healthcare will be added and Sun Country Airlines will be deleted on this date.