Founder's Guide
Series A vs Series B: What Actually Changes
A practical comparison of Series A and Series B rounds — valuation benchmarks, revenue milestones, investor expectations, and how the terms shift as you scale.
The short answer
Series A is the round that funds the search for a repeatable growth model. Series B is the round that funds scaling that model. The bar rises fast between them — on revenue, retention, team, and governance.
Side-by-side comparison
| Series A | Series B | |
|---|---|---|
| Stage focus | Product-market fit, early scaling | Scaling proven model, expanding market |
| Typical raise size | $5M – $20M | $15M – $50M+ |
| Typical valuation | $20M – $80M | $60M – $200M+ |
| Revenue benchmark (SaaS) | $1M – $3M ARR | $5M – $15M ARR |
| Growth expectation | Triple, then double YoY | Consistent 2–3x YoY at scale |
| Investor profile | Traditional VCs, seed follow-on | Growth-stage VCs, crossover funds |
| Board composition | Founders + lead investor(s) | Independent seats added |
| Use of proceeds | Team, GTM, product depth | Sales expansion, geographies, M&A |
| Dilution | 20 – 25% | 15 – 20% |
| Time to close | 3 – 6 months | 4 – 8 months |
What investors are underwriting
Series A investors underwrite proof of product-market fit — retention curves, payback periods, and a repeatable acquisition channel. They accept messy but want directionally right.
Series B investors underwrite scaling execution — sales efficiency, hiring plans, cohort expansion, and category leadership. Diligence is deeper, references are wider, and the data room needs to hold up.
Bridging A to B without a bridge round
Founders increasingly close the gap between institutional rounds with Reg CF, Reg A+, or Reg D 506(c) raises. Done right, an online round adds runway, builds a customer-investor base, and creates the revenue signal a Series B lead wants to see.
This works best when the online raise is treated as infrastructure — investor pipeline, updates, distribution — not a one-off campaign.
Related reading: How to write the perfect investor update — the cadence and structure Series A and B leads expect between rounds · Reg D vs Reg CF
Frequently asked questions
Planning your next round?
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