Series B SaaS Valuation 2026: $118.9M Median Post-Money, AI vs Non-AI Bifurcation
Carta Q3 2025 puts the cross-sector median at $118.9M post-money. PitchBook Q1 2026 shows AI Series B pre-money at $78M versus $42.4M for non-AI. Series B is where scaling SaaS separates from stalled SaaS -- and where multiple compression is most punishing when growth slips.
What Series B SaaS Looks Like in 2026
Series B is the funding stage where investors expect a company to have moved beyond product-market fit validation into a repeatable, scalable growth motion. The bar has risen. Two datasets bracket the current range: Carta's Q3 2025 primary-round data showing $118.9M median post-money cross-sector, and PitchBook-NVCA's Q1 2026 Venture Monitor which splits the market by AI versus non-AI and measures pre-money valuations.
The two figures are not contradictory. Carta's $118.9M is post-money and reflects the population of companies actively pricing on Carta, which skews toward higher-quality SaaS and AI companies. PitchBook's $78.0M AI and $42.4M non-AI are pre-money figures across the broad cross-sector mix, which includes more modest deals. Both are legitimate benchmarks; they answer different questions.
Median Series B dilution was 13% in Q3 2025 per Carta, declining from prior periods. With compounded dilution from seed and Series A, the median founding team retains approximately 23% post-Series B. Series B investors typically target 10-20% ownership per round.
Carta and PitchBook Series B Data (2025-2026)
The table below consolidates the primary data points. Carta and PitchBook use different measurement conventions; treat the figures as a range, not a single target.
| Source | Measure | Value | Notes |
|---|---|---|---|
| Carta Q3 2025 | Median post-money (cross-sector) | $118.9M | Primary rounds pricing on Carta; SaaS and AI skew above cross-sector average |
| PitchBook-NVCA Q1 2026 | AI Series B pre-money | $78.0M | Broad cross-sector mix; pre-money is before round capital added |
| PitchBook-NVCA Q1 2026 | Non-AI Series B pre-money | $42.4M | 45% below the AI figure; gap has widened from 2024 |
| Carta Q3 2025 | Median dilution | 13% | Declining from prior periods; investors typically target 10-20% |
| Carta dilution data | Founder ownership post-Series B | ~23% | Compounded from seed, Series A, and Series B rounds |
| Benchmarkit 2025 / SaaS Capital | Typical ARR range at Series B | $5M-$15M | Upper quartile growing 60%+; median growth 28% (Benchmarkit 2025) |
Sources: Carta, "State of Private Markets: Q3 2025"; PitchBook-NVCA, "Q1 2026 Venture Monitor"; Carta dilution data via Latin American VC, "Startup Equity and Dilution: What's Normal in 2025"; Benchmarkit, "2025 SaaS Performance Metrics"; SaaS Capital, "SaaS Valuation Multiples: Understanding the New Normal".
AI vs Non-AI at Series B
PitchBook-NVCA Q1 2026 median pre-money for AI Series B rounds. The AI premium at Series B is now structural: investors pay up for companies with AI-native architecture, not AI feature add-ons.
PitchBook-NVCA Q1 2026 median pre-money for non-AI Series B rounds -- 46% below the AI figure. Carta's Q3 2025 SaaS spotlight confirms AI companies command significantly higher valuations at every stage.
Post-money median from Carta Q3 2025 primary rounds. The higher figure versus PitchBook reflects (a) post-money measurement and (b) Carta's population skewing toward SaaS and AI companies actively repricing on the platform.
Net interpretation: a well-performing AI-native SaaS at Series B in 2026 should expect pre-money discussions in the $60-100M range depending on growth rate and gross margin. Non-AI SaaS faces a tighter range of $30-55M pre-money for median performers, with outliers above that band reserved for category leaders with demonstrably high NRR.
What Investors Evaluate at Series B
Series B diligence shifts from "does this work?" to "can this scale?" Five metrics dominate the underwriting conversation.
ARR scale: $5M-$15M with a credible path to $30M+
Series B is conventionally underwritten against $5M-$15M ARR (Benchmarkit, "2025 SaaS Performance Metrics"; SaaS Capital). Companies at the lower end of this band need steeper growth curves to justify the round. Companies already at $12-15M ARR with a clear expansion motion have more negotiating leverage on terms. First Page Sage's 2025 data documents that revenue multiples nearly double in the $50-100M deal-size band versus the $20-50M band -- meaning reaching $15M ARR cleanly is worth more than being at $10M with messier metrics.
Net Revenue Retention: the single most important quality signal
NRR above 110% signals that expansion revenue is compounding without additional sales spend. SaaS Capital's 2025 private SaaS benchmarks treat 110-120% NRR as the threshold that moves a company from the median into the premium multiple band. Below 100% NRR at Series B is a structural red flag: it means the business must replace churned revenue before growing, and the implied CAC payback period extends unfavourably. ChartMogul's 2025 SaaS Growth Report documents the NRR median for growing SaaS companies at around 104-108%, so 115%+ is a genuine differentiator.
Growth rate: 60%+ for the upper quartile, 28% for the median
Benchmarkit's 2025 SaaS Performance Metrics report puts median annual revenue growth at 28% for the broader SaaS dataset. The upper quartile runs at 60%+ and commands 8-10x ARR multiples at Series B per SaaS Capital's 2025 framework. Sub-30% growth compresses toward the 6-8x end of the range. Growth rate deceleration between Series A and Series B is more damaging than an absolute growth rate figure: investors model the trajectory, not the snapshot.
GTM motion: repeatable, not founder-dependent
Series B capital is specifically earmarked for GTM acceleration: hiring sales reps, expanding channel partnerships, and entering adjacent geographies or market segments. Investors need to see that the existing pipeline converts at a predictable rate before committing to fund a larger sales team. A burn multiple above 2.0x (i.e., spending $2+ per $1 of net new ARR) at this stage signals GTM inefficiency that the new capital alone cannot fix. CFO Advisors' 2025 burn-multiple benchmarks put the median Series A burn multiple at 1.6x; by Series B, the expectation is that this has improved further, not worsened.
Market expansion: evidence the TAM is real and capturable
At Series B, investor diligence often focuses on whether the initial ICP (ideal customer profile) is representative of a large enough market. Companies that won their first $5-10M ARR from a narrow enterprise cohort face scrutiny on whether the motion replicates into adjacent segments. The strongest Series B decks in 2026 show two or three distinct ICP cohorts already converting, not a single cohort with a theoretical TAM expansion story.
When Series B Falls Through
Series B is where the venture funnel compresses most sharply. Carta Q3 2025 documents that SaaS Series B rounds on Carta raised $1.6B in the quarter -- a 16% year-on-year decline -- while Series C grew 16% YoY. Capital shifted up the stack to later-stage deals with cleaner proof points. Two categories of company are most at risk.
Growth deceleration: the clearest Series B killer
If a company grew 80% in the year before Series A and 35% in the year before Series B, the deceleration is the story investors focus on -- not the absolute growth rate. Multiple compression at Series B is most punishing precisely because the Series B valuation anchors the Series C conversation. A company that raised Series B at 15x ARR on 80% growth will struggle to maintain that multiple at 35% growth, creating a flat or down round risk at Series C. SaaS Capital's 2025 data confirms sub-30% growers face the 6-8x ARR range regardless of ARR scale.
Declining deal volume: market conditions in 2025-2026
The 16% YoY decline in Series B SaaS deal volume on Carta in Q3 2025 is not evenly distributed. Companies in categories facing AI disruption risk (legacy workflow automation, low-differentiation analytics, productivity point solutions) face investor reluctance even with solid historical metrics. Investors who previously funded these categories at 10-15x ARR are now marking those positions down as AI-native alternatives enter the same markets at similar price points. Companies with clear AI differentiation are insulated; those without face a structurally harder Series B environment than the headline median suggests.
Frequently Asked Questions
What is the median Series B SaaS valuation in 2026?
Carta's Q3 2025 data puts the median primary Series B post-money valuation at $118.9M cross-sector. PitchBook-NVCA's Q1 2026 Venture Monitor reports AI Series B pre-money at $78.0M and non-AI at $42.4M. The two datasets answer different questions: Carta measures post-money and skews toward higher-quality SaaS companies pricing on Carta; PitchBook measures pre-money across the broad cross-sector mix.
How much dilution do founders take at Series B?
Carta Q3 2025 dilution data shows median Series B dilution at 13%, declining from prior periods. With compounded dilution from seed and Series A, the median founding team retains approximately 23% post-Series B. Series B investors typically target 10-20% ownership per round.
What ARR is expected at Series B?
Series B is conventionally underwritten against $5M-$15M ARR with growth rates above 60% for the upper quartile. Benchmarkit's 2025 SaaS Performance Metrics report puts median annual revenue growth at 28% for the broader SaaS dataset. Multiple ranges are 8-20x ARR, with the heaviest weight at 6-12x for typical performers. Companies growing above 40% annually often clear 8-10x ARR; sub-30% growth compresses toward the lower end.
Why did Series B funding volumes drop in 2025?
Series B SaaS startups raised $1.6B on Carta in Q3 2025, a 16% year-on-year decline. The same quarter, Series C climbed 16% YoY. Capital that previously flowed into Series B shifted upward to later-stage deals where growth proof is more established. Multiple compression is most punishing at Series B when growth slips: investors at this stage expect a clear, repeatable GTM motion, not just product-market fit.
Founder of Digital Signet, an independent research firm publishing data-led pricing and decision tools. SaasValuationMultiple.com is sourced from Software Equity Group quarterly reports, public IPO comparables, SEC 10-K filings, and PitchBook excerpts. Multiples shown are reference ranges; for case-specific guidance consult an M&A advisor.