NEW YORK, Aug. 26, 2026 /PRNewswire/ -- Tenable Holdings Inc. (NASD: TENB) will replace Leggett & Platt Inc. (NYSE: LEG) in the S&P SmallCap 600 effective prior to the opening of trading on Monday, August 31. S&P MidCap 400 constituent Somnigroup International Inc. (NYSE: SGI) is acquiring Leggett & Platt in a deal expected to be completed 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
Aug 31, 2026 S&P SmallCap 600 Addition Tenable TENB Information
Holdings Technology
Aug 31, 2026 S&P SmallCap 600 Deletion Leggett & Platt LEG Consumer
Discretionary
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