How venture works
Funding stages from pre-seed to IPO
What each round is for, typical sizes, dilution and the milestones investors expect.
Startup financing is a staircase, not a single check. Each step buys a different kind of progress: product truth, go-to-market repeatability, scale, or public-market readiness. Founders who blur the stages pitch Series A metrics with a pre-seed company, or raise growth capital before the engine exists.
Numbers cited in this section are orders of magnitude as of 2025–2026, especially from Carta's State of Private Markets. Use medians to navigate, not to litigate a term sheet.
Concepts in this section
Read them in order. Dilution math is easier once the staircase and the check sizes are in place.
| Step | Concept | What it answers |
|---|---|---|
| 1 | The funding staircase | What is each letter actually for? |
| 2 | Round sizes and dilution | How much cash, and how much of the company? |
| 3 | Round milestones | What proof unlocks the next check? |
| 4 | Founder dilution across rounds | How does 100% become the teens? |
Venture is cyclical. A compressed history: 2021 boom (abundant capital, high prices, growth at all costs); 2022–2023 correction (rate shock, down rounds, bridges, fewer deals); 2024–2026 AI-driven bifurcation (fewer deals clearing the bar, higher valuations for those that did). Inside one calendar year an AI infrastructure seed can clear a high cap while a vertical SaaS company with real revenue struggles to find a lead. Stage labels do not equal difficulty — category and narrative do.
Trade-off
Raising in a boom maximizes price and speed but often maximizes future expectation debt. Raising in a trough improves discipline and terms for investors, not founders. The skill is raising enough to reach the next proof point without assuming the weather stays fair.
When you hear "we have 18 months of runway to Series A," translate to: which Series A metrics, in this market, for this category? Then look at burn. If the company raised a huge seed in a boom and is now "raising an A" with flat metrics, you may be walking into a bridge or down round story.
Common mistakes
- Treating a median valuation as a promise. It is a weather report.
- Raising a stage ahead of the milestones. That is how down rounds start.
- Planning seed runway with no fundraising buffer. The process itself takes months.
- Reading founder % at seed as founder % at IPO.
Key takeaways
- Each stage buys down a different risk: team/product → fit → repeatability → scale → public readiness.
- Primary rounds commonly sell ~15–25%; Carta's 2025 medians sat near the high teens for seed and A.
- Series A still means "repeatable growth," even when ARR bars differ by sector.
- Founder ownership often falls from 100% to the teens across a full venture path.
- Match capital to milestones; market weather changes price, not the staircase logic.
Further learning
Carta: State of Private Marketscarta.com The Holloway Guide to Raising Venture CapitalA current and comprehensive resource for entrepreneurs, with technical detail, practical knowledge, real-world scenarios, and pitfalls to avoid.Holloway
Related
Cap tables and dilution
The ownership ledger from founding through Series B — start here for the map, then walk the numbers.
How venture capital works
LPs, GPs, fund structure, management fees, carry and the returns VCs need.
How startup valuation really works
Early valuations as negotiated ownership, later ones as revenue multiples — and why the headline number can lie.