Tenable Holdings (TENB) - Due Diligence

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check_circleFair value reached · +39.60%

Realized +39.60% in 43 days from the tracked date (reference price $23.12). Call closed and archived — this report is a historical document, no longer maintained.

74OpportunityDD: May 18, 2026Analyst: 79

paidReference price

USD 23.1 (18/05/2026)

domainMkt cap

pie_chartShares

111M

candlestick_chart52W

$15.73-$35.69

trending_downShort interest

5.8%

INFONASDAQInformation Technology2300 employeesFounded 2002

Verdict: UNDERVALUED — quality SaaS at value multiple

TENB trades at ~2.0x forward EV/Revenue and ~9x P/FCF — multiples typical of struggling no-growth SaaS, not a 96%-recurring, 82% gross margin, 24%-operating-margin cybersecurity platform that just beat Q1 and raised FY26 guide. The market is pricing AI disruption and 8–10% growth as terminal; CFO bought 12,000 shares at $21.54 (May 4, 2026) signaling internal disagreement. Base FV $30 (+40%); risk/reward attractive with profitability floor.

📊 DIANALITICS RESEARCH INDEXCompany & Thesis Assessment Score /100 — updated 2026-05-18

Tenable Holdings, Inc. (TENB)

Cybersecurity / Exposure Management SaaS · NASDAQ · Columbia, MD

"Profitable cyber SaaS pricing at no-growth multiples — asymmetric upside."

96% recurring CFO insider buy FY26 guide raised Growth deceleration AI disruption thesis

Fin. strength

/20 pts

EBITDA/FCF

/15 pts

Debt/leverage

/15 pts

Stage/business

/15 pts

Catalysts

/10 pts

Reg. risk

/8 pts

Risk/reward

/7 pts

Management

/5 pts

Sector/macro

/3 pts

Compliance

/2 pts

💡 Fair Value Estimate — EV/Revenue forward (primary) + P/FCF + P/E cross-check

Fair value base case

USD 30.0

Range: USD 22.0-USD 42.0

Reference price: USD 23.1 (18/05/2026)

Base upside/downside: +40%

Methodology: EV/Revenue primary (3.0x × $1.073B ≈ $3.2B EV → ~$30 equity per share after net cash). Cross-checks: (a) P/FCF at 12x × $2.33 FCF/sh = $28; (b) Non-GAAP P/E at 15x × $1.94 = $29. All three converge in the $28–30 range, giving high confidence. Profile [SaaS / Tech ARR] — base-heavy weighting (50%) per Step 2 SaaS methodology; bear weight elevated (30%) to reflect AI disruption thesis and downgrade momentum. ⚠️ Not investment advice.

Component	Assumption	USD/share
Subscription / recurring revenue core	FY26E recurring rev ~$1.03B (96% of $1.073B mid) × 3.0x EV/Rec.Rev (peer-blend discount: vs QLYS 6.5x, RPD 2.0x, S 5.5x — TENB at deceleration premium to RPD only)	+27.92
Professional services + non-recurring	~$43M services rev × 1.5x EV/Rev = $64.5M / 110.7M sh	+0.58
Vulcan Cyber option value	$150M acquisition (Feb 2025); 70% probability × $250M long-term integration NPV = $175M / 110.7M sh	+1.58
Net cash position	~$200M est net cash (post-Vulcan deal) / 110.7M sh (estimate, exact debt N/D motivated: $300M conv. notes due 2026 vs ~$500M cash)	+1.81
AI disruption / multiple compression haircut	−6% on aggregate value to reflect William Blair AI-disruption thesis and persistent risk of growth slipping below 8%	−1.91
FV base case	$27.92 + $0.58 + $1.58 + $1.81 − $1.91 = $29.98/sh (rounded $30)	≈ $30

Bull

$38–$42

Probability: 20%

Growth re-accelerates to 12–14% in 2H 2026 driven by Tenable One adoption (60%+ new biz); Vulcan integration drives ARR expansion; multiple re-rates to 4–5x EV/Rev as AI disruption fears fade.

Base

$27–$32

Probability: 50%

FY26 guide delivered ($1.073B rev mid, $1.94 EPS); Tenable One mix steady at 40–45%; multiple holds 2.5–3.5x EV/Rev; FCF grows to $280M.

Bear

$16–$22

Probability: 30%

AI commoditizes vulnerability management; growth slows to 5–7%; Wiz/CRWD platform consolidation pressures pricing; multiple compresses to 1.5–2x EV/Rev; FY27 guide cut.

Methodology: Methodology: EV/Revenue primary (3.0x × $1.073B ≈ $3.2B EV → ~$30 equity per share after net cash). Cross-checks: (a) P/FCF at 12x × $2.33 FCF/sh = $28; (b) Non-GAAP P/E at 15x × $1.94 = $29. All three converge in the $28–30 range, giving high confidence. Profile [SaaS / Tech ARR] — base-heavy weighting (50%) per Step 2 SaaS methodology; bear weight elevated (30%) to reflect AI disruption thesis and downgrade momentum. ⚠️ Not investment advice. Not investment advice.

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✅ Q1 2026 beat + FY26 guidance raise + CFO insider buy

Q1 2026 revenue $262.1M (+9.6%); Non-GAAP op income $61.9M (+27% YoY, 23.6% margin); Tenable One = 41% of new business (+8pp). FY26 guidance raised: revenue $1.068–1.078B, Non-GAAP op income $252–262M, Non-GAAP EPS $1.90–1.98 (+22% YoY at mid). CFO Matthew Brown purchased 12,000 shares at ~$21.54 on May 4, 2026 — first insider open-market buy in many quarters.

📊 Capital Structure · Short Interest · Buyback & Dilution

🟡 Short Interest

5.8%

6.8M shares short (+22.4% vs prior). Moderate; reflects AI-disruption skeptics. Days-to-cover ~4.

🟢 Share dilution (1Y)

~+2%

SBC-driven dilution offset partially by buyback. ~111M shares outstanding. CFO M. Brown bought 12,000 sh @ $21.54 (May 4, 2026) — first material open-market insider buy in years ($258K, below $500K reporting threshold).

🔵 Buyback program

Active

Periodic repurchase authorizations; pace not disclosed in detail. Ameriprise/Columbia disclosed ~7% stakes (institutional support).

TENB — 5.8% short interest

5.8%

Short Interest — context: <5% low · 5–15% moderate · 15–25% high · >25% very high. TENB sits in the low-moderate range; the +22% recent increase suggests sentiment continues to deteriorate even as the stock is already at the 52W low region (~$16–22). Insider buying at $21.54 vs short build at similar levels frames the contrarian setup.

$Financial analysis — FY2024–FY2026E

FY25 Revenue

$999.4M

+11% YoY

Non-GAAP op margin Q1 26

23.6%

+350 bps YoY

FY25 FCF (est)

~$258M

25.8% FCF margin

FY26 Rev guide

$1.068–1.078B

+7–8% YoY (raised)

Item	FY23	FY24	FY25	FY26E (Guidance mid)
Revenue ($M)	801	900	999.4	1,073
Subscription revenue ($M)	730	825	925	~1,030 (96% mix)
Non-GAAP gross margin %	80.5%	81.5%	82.0%	~82%
Non-GAAP op income ($M)	120	175	214	257 (mid of guide)
Non-GAAP op margin %	15.0%	19.4%	21.4%	24.0%
Non-GAAP EPS ($)	0.84	1.30	1.59	1.90–1.98 (mid 1.94)
FCF ($M)	175	225	258	~280
Customer count (enterprise)	~9.1K	~10.5K	~11.5K	~12.2K (est)
Net dollar expansion %	108%	107%	106%	~105%

Quarterly dynamics — last 5 quarters
Item	Q1 25	Q2 25	Q3 25	Q4 25	Q1 26
Revenue ($M)	239.1	247.3	252.4	260.5	262.1
Revenue YoY %	11.0%	12.0%	11.0%	11.0%	9.6%
Non-GAAP op margin %	19.8%	20.5%	23.3%	22.0%	23.6%
Tenable One mix %	33%	35%	40%	40%	41%
FCF ($M)	86.8	44.3	~70	~57	~85 (est)

Some quarterly metrics (FCF Q3/Q4 2025) are estimates derived from FY-level disclosure where company reported only annual totals. Q1 2026 figures (revenue $262.1M, Non-GAAP op income $61.9M = 23.6%, Tenable One 41%) are confirmed from the April 30, 2026 release. NDR 105% Q1 2026 disclosed.

Financial position and sustainability

FCF margin

~26%

Recurring revenue mix

96%

Non-GAAP gross margin

82.2%

Net dollar retention

105%

Revenue growth (FY26 guide)

~7.5%

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Business model — Exposure Management SaaS

What Tenable does

Tenable is a leader in cybersecurity vulnerability and exposure management. The company sells subscription-based software (Nessus, Tenable.io, Tenable Cloud Security, Tenable OT Security) under the unified Tenable One Exposure Management Platform. The strategy: consolidate fragmented security tools (vulnerability mgmt + cloud security + OT + identity exposure + remediation) into a single platform that gives CISOs unified visibility across the attack surface. Customer base: ~11,500 enterprises including 65% of Fortune 500. Vulcan Cyber acquisition (Feb 2025, $150M) added 100+ third-party remediation integrations.

Core Vulnerability Mgmt (Nessus / Tenable.io) ~$640M FY26E (60% rev) 🟡 mature, slowing Legacy VM franchise; renewal-driven, high retention. Growth has decelerated to mid-single digits as the category matures. Strong moat in compliance/regulatory use cases. Tenable One platform ~$350M FY26E (33% rev) 🟢 41% of new biz Unified exposure management bundle: VM + cloud + OT + identity + Vulcan remediation. Mix grew from 33% (Q1 25) to 41% (Q1 26). Core re-rating driver if mix hits 60%+. Cloud / OT / Identity adjacencies ~$80M FY26E (7% rev) 🟢 fastest growth Tenable Cloud Security, Tenable OT (operational technology), Identity Exposure. Smaller scale but fastest growth segments. Competes vs Wiz, Palo Alto Networks, Microsoft Defender.

gavel

Legal, regulatory and risk analysis

AI disruption thesis

High

William Blair downgraded TENB/QLYS/RPD to Market Perform on argument that AI-powered cyber tools (CrowdStrike, Wiz) will commoditize vulnerability scanning. Real risk; will play out over 2–4 years not 6 months.

Growth deceleration

High

Revenue growth slowed from 24% (FY22) → 19% (FY23) → 12% (FY24) → 11% (FY25) → 7–8% guide (FY26). Trajectory matters more than absolute number; further deceleration to 5% would re-rate stock to ~$16.

Platform consolidation pressure

Moderate

CRWD/PANW/Microsoft bundle vulnerability management into broader security suites. TENB risks being squeezed: best-of-breed but standalone. Tenable One is the strategic response; execution still proving out.

Net dollar retention drift

Moderate

NDR has trended from 108% (FY23) → 107% (FY24) → 106% (FY25) → 105% (Q1 26). Still positive but declining; below the 110% sweet spot. Indicates upsell + price increases are barely offsetting churn at the low end.

Convertible note maturity 2026

Moderate

Outstanding convertible notes (~$300M) maturing during 2026; refinancing risk is low given $258M FCF run-rate and strong cash position, but introduces some near-term capital action uncertainty.

Profitability + FCF generation

Positive

82% Non-GAAP gross margin, 24% Non-GAAP op margin (FY26 guide mid), ~26% FCF margin, ~$258M FCF run-rate. Cybersecurity SaaS economics with profitability — relatively rare for a "value" multiple.

CFO insider buying signal

Positive

CFO Matthew Brown purchased 12,000 shares at $21.54 on May 4, 2026 (~$258K). Below the $500K mandatory-flag threshold, but symbolically significant: first material open-market CFO buy in years, at near 52W lows.

No active class action / SEC issues

Positive

No securities class actions, short-seller reports, or SEC investigations identified in 2025–2026. Clean governance backdrop; institutional ownership stable (Ameriprise/Columbia ~7% stakes disclosed).

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SWOT analysis

Strengths

+96% recurring revenue + 82% Non-GAAP gross margin = best-in-class SaaS economics
+Non-GAAP op margin 24% with FCF margin ~26% — profitability beats most peers
+Tenable One platform mix 41% (+8pp YoY) — strategic narrative is working
+CFO open-market purchase at $21.54 (May 4, 2026) signals management conviction

Weaknesses

−Revenue growth decelerating: 24% → 11% → 7–8% guide over 4 years
−NDR drifting down (108% → 105%) below SaaS sweet spot
−Subscale vs CRWD/PANW (Tenable $1B rev vs CRWD $3.8B+ ARR)
−SBC dilution offsets some of the buyback impact (~2% net dilution)

Opportunities

→Tenable One mix expansion to 60%+ would drive both growth re-acceleration AND multiple re-rating
→Vulcan Cyber integration: 100+ third-party connectors expand TAM into remediation
→Cloud security, OT security adjacencies have larger TAM than legacy VM
→M&A target risk/opportunity: at 2x EV/Rev, TENB is the cheapest large-scale profitable cyber SaaS asset

Threats

!AI-powered cyber tools (CRWD, Wiz) commoditize vulnerability scanning
!Platform consolidation by CRWD/PANW/Microsoft bundles VM as free feature
!If Tenable One mix stalls below 45%, the bull thesis breaks and multiple compresses further
!Macro: enterprise cyber budget tightening could pressure expansion ARR

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Summary by assessment area

🟢 Valuation

2.0x forward EV/Revenue — deep discount to QLYS (6.5x)
9x P/FCF on $258M FCF run-rate
11x forward P/E on $1.94 Non-GAAP EPS guide

🟡 Operational

Growth slowing (24% → 8%) but margins expanding
Tenable One mix is the key swing metric — track quarterly
NDR drift from 108% to 105% needs to stabilize

🔵 Action / timing

Initiate at $20–22 zone; size up on Tenable One mix >45% disclosure
Watch Q2 26 (Aug 2026) for growth/mix inflection
Buyback + CFO insider buy provide downside cushion at $16–18

2026-08-05 earnings

Q2 2026 Earnings Release

short-term Impact: High Direction: Binary

First proof point of FY26 raised guide. Watch: Tenable One mix >42% would validate platform momentum; NDR stabilization at 105%+ would relieve attrition concern.

2026-09-30 capital_markets

2026 convertible note maturity refinancing

medium-term Impact: Medium Direction: Neutral

~$300M convertible notes maturing; refinancing path (new debt vs cash settlement vs equity component) sets near-term capital structure. Low risk given $258M+ FCF.

2026-10-30 product

Tenable One mix reaches 45%+ of new business

medium-term Impact: High Direction: Bullish

Tenable One mix progression (33% → 35% → 40% → 41% over last 4 qtrs) needs to clear 45% to validate the platform thesis and justify multiple re-rating toward 3.5–4x EV/Rev.

2026-10-30 earnings

Q3 2026 Earnings Release

medium-term Impact: High Direction: Binary

Half-year tracking on FY26 guide. Q3 is seasonally important for enterprise budget allocation. AI-disruption thesis test: do large enterprises still buy TENB or migrate to bundled CRWD/PANW offerings?

2026-11-30 operational

Vulcan Cyber 18-month integration update

medium-term Impact: Medium Direction: Bullish

~18 months after the Feb 2025 close. Management likely to provide ARR contribution detail, customer wins, and roadmap for the integrated remediation platform.

2027-02-10 earnings

FY2026 Full Year Results & FY2027 Guidance

long-term Impact: High Direction: Binary

FY27 guide is the decisive inflection: 10%+ growth = bull thesis confirmed, multiple re-rates; 6–8% growth = base case extends; sub-6% = AI disruption thesis wins and stock retests $16.

2027-03-31 ma

M&A speculation — strategic or PE buyer

long-term Impact: High Direction: Bullish

At 2.0x EV/Rev and $258M FCF, TENB is the cheapest profitable cyber SaaS asset of scale. Strategic logic: CRWD/PANW could absorb the VM franchise; Thoma Bravo / Vista pattern of taking cyber SaaS private at 4–6x EV/Rev.

2026-12-31 macro

Enterprise cyber budget cycle (2027 planning)

medium-term Impact: Medium Direction: Neutral

Q4 is the enterprise security budget planning window for 2027. Industry CISO surveys (Gartner, IDC) and competitive bake-offs will signal whether TENB is winning consolidation or losing share to platforms.

Sources & Disclaimer

Sources: Tenable Q1 2026 / FY2025 earnings releases (investors.tenable.com), Tenable 10-Q / 8-K (Stocktitan.net/sec-filings/TENB), Motley Fool Q1 2026 transcript (fool.com/earnings/call-transcripts/2026/04/30/), Investing.com Q1 2026 transcript, TradingView 10-Q summary, Stock Analysis (stockanalysis.com/stocks/tenb), Yahoo Finance, CNN Markets, Investing.com TENB quote pages, MarketBeat / Nasdaq insider activity (CFO Matthew Brown 12,000 sh buy May 4, 2026), GuruFocus insider tracking, Vulcan Cyber acquisition disclosures (tenable.com/press-releases, globenewswire.com/news-release/2025/02/07/), William Blair downgrade note (Seeking Alpha 4581533), Susquehanna / Stifel price target updates, peer data: Qualys (QLYS), Rapid7 (RPD), SentinelOne (S), CrowdStrike (CRWD) public market data. This document is for informational purposes only and does not constitute financial or investment advice. Forward-looking estimates carry execution risk. Price reference: $21.49 (intraday May 16, 2026; prev close $20.45); 52W range $15.73–$35.69.