1. ACM Research is joining the S&P SmallCap 600 on September 26. 2. WK Kellogg is being replaced due to acquisition by Ferrero Group. 3. Inclusion in the S&P index could increase ACMR's visibility. 4. Index changes typically influence stock liquidity and price movement. 5. Investors may react positively to ACMR's addition to the index.
Historically, stocks added to major indices often see price increases. For instance, stocks like Etsy and Pinterest surged after joining the S&P 600.
Inclusion in the S&P SmallCap 600 influences institutional investment, increasing demand and liquidity. This transition usually resonates well with market participants.
Market reacts quickly to index changes, usually within several trading sessions. Similar cases show immediate stock appreciation post-index inclusion.
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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