Tenable (TENB) Moves 16.5% Higher: Will This Strength Last?

Tenable (TENB) surged 16.5% to $35.08 after reporting second-quarter 2026 results that showed Tenable One capturing 50% of new business and net dollar expansion hitting 106%. The cybersecurity firm expects Q2 EPS of $0.51, up 21.4% year-over-year, on revenues of $271.73 million, a 7.6% increase.

Despite the strong move, earnings estimate revisions have trended marginally lower over the past 30 days, which could cap near-term upside. The stock carries a Zacks Rank of 3 (Hold). Peer Rapid7 (RPD) jumped 24.1% but faces declining earnings expectations, according to Zacks Investment Research.

The Tenable One platform's penetration rate—now representing half of all new deals—signals growing product-market fit in the unified vulnerability management space. The 106% net dollar expansion rate indicates existing customers are increasing spending, a key metric for software investors assessing revenue durability.