Fundraising
Series B
Last updated
Quick Answer
The third major institutional funding round, typically raised after demonstrating product-market fit and early revenue traction, used to scale sales, marketing, and operations.
What it is
A Series B is the third significant funding milestone for a venture-backed startup (following seed and Series A). By the time a company raises a Series B, it should have clear evidence of product-market fit, a repeatable go-to-market motion, and meaningful recurring revenue — typically $5M–$20M ARR for SaaS companies.
Series B capital is used to scale proven playbooks rather than discover new ones: expanding the sales team, investing in marketing, entering new markets, and building out operational infrastructure. Check sizes typically range from $20M to $50M+, with pre-money valuations commonly between $50M and $200M, though both vary significantly.
The transition from Series A to Series B is often described as moving from 'figuring out the business' to 'building the machine.' Investors at this stage are focused on efficiency metrics, go-to-market scalability, and competitive moat.
In Practice
A B2B software company raised a $10M Series A at $40M post-money. After 18 months it's at $8M ARR, growing 150% year-over-year, with a clear enterprise sales motion. It raises a $30M Series B at $120M post-money to double the sales team and expand internationally.
Operational context
What good looks like
The term is tied to a real workflow, not just a definition.
Ownership, timing, and evidence are clear.
The reader can tell what decision the concept supports.
Related terms point to the next useful explanation.
Why It Matters
The Series B is where companies prove their model can scale — or fail trying. Many companies stall at this stage because early growth was driven by founder-led sales that don't transfer to a growing sales organization. Hitting Series B metrics efficiently is a major proof point for potential Series C investors.
VC Beast Take
Series B is where the wheat separates from the chaff. The companies that nail their Series A execution and truly crack scalable growth models get rewarded with abundant Series B capital. Those that don't often find themselves in the dreaded 'Series A and a half' territory, struggling to attract top-tier investors.
Term Family
Related concepts
Further Reading
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A clause-by-clause breakdown of every standard VC term sheet provision — what each term means, what's market, what to negotiate, and the red flags that cost founders millions.
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Best Cap Table Management Software in 2026: Carta vs Pulley vs AngelList
Archstone for funds, Carta for Series A startups, Pulley early, Ledgy in Europe. Capshare and LTSE Equity are gone. 2026 pricing, picks and trade-offs.
Related Guides
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Everything you need to understand about venture capital — how funds raise money, how deals get done, and how returns flow back to investors. The definitive primer.
Related Questions
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Frequently Asked Questions
What is Series B in venture capital?
A Series B is the third significant funding milestone for a venture-backed startup (following seed and Series A). By the time a company raises a Series B, it should have clear evidence of product-market fit, a repeatable go-to-market motion, and meaningful recurring revenue — typically $5M–$20M ARR...
Why is Series B important for startups?
Understanding Series B is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.
What category does Series B fall under in VC?
Series B falls under the fundraising category in venture capital. This area covers concepts related to how startups and funds raise capital from investors.
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