ACM Research Set to Join S&P SmallCap 600

Rhea-AI Summary

ACM Research (NASDAQ: ACMR) will be added to the S&P SmallCap 600 index effective prior to market opening on September 26, 2025. The addition comes as WK Kellogg (NYSE: KLG) is being removed from the index due to its pending acquisition by The Ferrero Group.

ACMR will join the index under the Information Technology sector, replacing KLG which was previously listed under Consumer Staples. The change will be implemented once the Ferrero Group's acquisition of WK Kellogg closes, subject to final conditions.

Positive

• Inclusion in S&P SmallCap 600 index can increase visibility and trading volume
• Addition to the index typically leads to increased institutional ownership
• Potential for enhanced market liquidity due to index fund purchases

Negative

• None.

Insights

Index Inclusion Strategist

ACM Research's addition to the S&P SmallCap 600 should drive institutional buying and improved liquidity, a positive catalyst for the stock.

ACM Research's upcoming inclusion in the S&P SmallCap 600 index represents a significant milestone for the semiconductor equipment manufacturer. This addition, effective September 26, typically triggers mandatory purchases by index funds and ETFs that passively track the SmallCap 600, creating substantial short-term demand for ACMR shares.

The mechanics behind index inclusion are powerful - approximately $15-20 billion in assets directly track the SmallCap 600, meaning fund managers must allocate capital to ACMR proportionate to its weight in the index. Beyond this immediate benefit, inclusion provides three additional advantages:

• Enhanced trading liquidity and potentially tighter bid-ask spreads
• Increased institutional visibility among active managers who benchmark against the index
• Validation of the company's market standing and financial stability

Historical data shows small caps typically experience 3-5% price appreciation between announcement and effective inclusion dates, with an additional potential tailwind as new passive holders tend to have longer investment horizons, reducing float volatility. This structural change in ACMR's shareholder base represents a technical catalyst independent of the company's fundamental business operations.

NEW YORK, Sept. 22, 2025 /PRNewswire/ -- ACM Research Inc. (NASD: ACMR) will replace WK Kellogg Co. (NYSE: KLG) in the S&P SmallCap 600 effective prior to the opening of trading on Friday, September 26. The Ferrero Group is acquiring WK Kellogg 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
Sept 26, 2025	S&P SmallCap 600		Addition	ACM Research	ACMR	Information Technology
Sept 26, 2025	S&P SmallCap 600		Deletion	WK Kellogg	KLG	Consumer Staples

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View original content:https://www.prnewswire.com/news-releases/acm-research-set-to-join-sp-smallcap-600-302563572.html

SOURCE S&P Dow Jones Indices

FAQ

When will ACM Research (ACMR) join the S&P SmallCap 600 index?

ACM Research will join the S&P SmallCap 600 index prior to the opening of trading on September 26, 2025.

Why is ACM Research (ACMR) being added to the S&P SmallCap 600?

ACMR is being added to replace WK Kellogg (KLG), which is being removed due to its pending acquisition by The Ferrero Group.

What sector will ACM Research (ACMR) represent in the S&P SmallCap 600?

ACM Research will be classified under the Information Technology sector in the S&P SmallCap 600 index.

What are the benefits for ACM Research (ACMR) joining the S&P SmallCap 600?

Joining the S&P SmallCap 600 typically provides benefits such as increased visibility, higher trading volume, and greater institutional ownership due to index fund investments.