Tenable Holdings Set to Join S&P SmallCap 600
Tenable Holdings (NASD: TENB) will be added to the S&P SmallCap 600, replacing Leggett & Platt (NYSE: LEG), effective prior to the open on August 31, 2026, according to S&P Dow Jones Indices.
Sentiment and the balance of points
Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.
Rhea-AI Summary
Tenable Holdings (NASD: TENB) will be added to the S&P SmallCap 600, replacing Leggett & Platt (NYSE: LEG), effective prior to the open on August 31, 2026, according to S&P Dow Jones Indices. Leggett & Platt is being acquired by Somnigroup International (NYSE: SGI), a constituent of the S&P MidCap 400, in a transaction expected to close soon, subject to final conditions.
The index change will place Tenable in the Information Technology sector within the S&P SmallCap 600, while Leggett & Platt, classified in Consumer Discretionary, will be deleted from that index on the same effective date.
Positive
- Tenable added to S&P SmallCap 600 effective August 31, 2026
- Somnigroup acquiring Leggett & Platt, triggering index rebalancing
Negative
- Leggett & Platt removed from S&P SmallCap 600 on August 31, 2026
Details
News Market Reaction – SGI
On Aug 27, the first trading day after this news, SGI closed 0.54% below the previous close. Relative volume reached 2.1x the daily average during tracking.
Data tracked by StockTitan Argus for the Aug 27 session.
Key Figures
- Effective date
- August 31, 2026
- S&P SmallCap 600 changes effective before market open
Historical Context
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New president appointed to oversee Leggett & Platt operations
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All-stock combination with Leggett & Platt completed
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Leggett & Platt shareholders approved the proposed Somnigroup merger
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Profitability improved and full-year adjusted EPS guidance was provided
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Third-quarter cash dividend declared at $0.17 per share
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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 | |
Aug 31, 2026 | S&P SmallCap 600 | Addition | Tenable Holdings | TENB | Information Technology | |
Aug 31, 2026 | S&P SmallCap 600 | Deletion | Leggett & Platt | LEG | Consumer Discretionary | |
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SOURCE S&P Dow Jones Indices
FAQ
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