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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SOURCE S&P Dow Jones Indices

ACM Research Set to Join S&P SmallCap 600