RPD vs TENB: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: RPD is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. RPD and TENB share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined RPD and TENB exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Rapid7 (RPD) is a cybersecurity company providing a cloud-based platform for security operations, vulnerability management, and threat detection. Its Insight platform spans several products: InsightVM for vulnerability management, InsightIDR for detection and response (SIEM and XDR), InsightCloudSec for cloud security posture, and application security testing. Increasingly, Rapid7 packages these into managed detection and response (MDR) services, where its analysts monitor customer environments around the clock, which appeals to mid-market companies that lack large in-house security teams.

Full RPD guide

Tenable Holdings is a cybersecurity company focused on exposure management: helping organizations find, prioritize, and reduce the vulnerabilities and misconfigurations that attackers could exploit. Its best-known product is Nessus, one of the most widely used vulnerability scanners in the industry, and its cloud platform Tenable One extends that capability across IT systems, cloud environments, operational technology, identities, and web applications. The company makes money primarily through subscriptions to its platform, generating recurring revenue as customers pay annually to continuously scan and assess their attack surface. Tenable's pitch is preventive: rather than detecting attacks after they happen, it helps organizations understand and shrink their exposure before attackers strike, and prioritize which weaknesses matter most. It serves enterprises, governments, and mid-market customers across many industries. Headquartered in Columbia, Maryland, Tenable competes in the broad and growing market for vulnerability and exposure management within the larger cybersecurity market.

Full TENB guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• RPD drivers: Platform consolidation; Managed detection and response.
• TENB drivers: Exposure management and platform expansion; Recurring subscription revenue.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Rapid7 competes against larger, better-capitalized platforms (CrowdStrike, Palo Alto Networks, Microsoft, Tenable, Qualys) that bundle overlapping vulnerability, SIEM, and cloud-security capabilities, pressuring pricing and growth. For TENB, cybersecurity is intensely competitive and consolidating.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick RPD if you believe its drivers more; TENB if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the RPD and TENB guides.

RPD. Rapid7 now trades at about 1x sales and roughly 6x forward earnings, far below security peers, because revenue has stopped growing and GAAP profit is thin. The gap between a 40x trailing GAAP multiple and a 6x forward multiple comes from the difference between GAAP earnings and the adjusted EPS analysts forecast. Twenty-one analysts rate it a hold on average with a mean target near $11.81, and Q3 results arrive November 4, 2026.

TENB. As of October 16, 2026, Tenable trades near $36.57, about 3.9 times trailing revenue and roughly 17 times forward earnings; the trailing P/E is not meaningful because GAAP net income is only about $7 million. Investors value it on free cash flow, which runs near 25 percent of revenue. The multiple has expanded with the 2026 rebound even as growth slowed to high single digits, and fiscal third-quarter results on October 28 are the next test.

Headline figures (approximate, October 2026): RPD shows revenue (ttm) ~$856 million, revenue growth ~-1.5% YoY (Q2 2026), q2 2026 eps vs estimate $0.44 vs ~$0.35 (non-GAAP), gross / operating margin ~69% / ~2% (GAAP); TENB shows revenue (ttm) ~$1.04 billion, revenue growth (latest quarter, yoy) ~9%, gross margin ~78%, operating margin (gaap) ~5%.

RPD and TENB are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined RPD and TENB exposure against your real portfolio. It is not an investment adviser.