Tenable is trading 7.55% up in pre-market at $36.20 after S&P Dow Jones Indices announced its addition to the S&P SmallCap 600.
- The change replaces Leggett & Platt and becomes effective before trading opens on August 31, 2026.
- The inclusion likely supports pre-market demand through anticipated index-fund buying; broader technology strength provides additional support.
- No new earnings announcement or guidance change was identified for August 27, 2026.