Startup funding rounds follow a well-defined progression — each round has a purpose, expected metrics, typical size, and set of investors.

Pre-seed (Founders / Angels / Accelerators)

• Purpose: Build MVP, validate initial insight.
• Round size: $250K–$3M.
• Valuation (post-money): $5M–$15M.
• Instruments: SAFEs, convertible notes.
• Lead investors: Pre-seed VCs, angels, accelerators (YC, Techstars), scouts.
• Metrics expected: Compelling founders, clean problem insight, early product demo.

Seed

• Purpose: Prove early product-market fit; hire a small team.
• Round size: $2M–$8M (increasingly $5M–$15M for AI-native).
• Valuation: $10M–$40M.
• Instruments: SAFEs stack or priced seed.
• Lead investors: Seed-focused funds (First Round, Initialized, Uncork, Primary, Hustle Fund).
• Metrics expected: Early usage or revenue, initial customer love, product velocity.

Series A

• Purpose: Scale a proven wedge; build repeatable GTM.
• Round size: $10M–$25M (higher for AI, defense, hardware).
• Valuation: $40M–$150M.
• Instruments: Preferred equity with full VC terms.
• Lead investors: Brand Series A funds (Benchmark, Sequoia, a16z, Accel, Index, Atomico).
• Metrics expected: $1M–$5M ARR (SaaS), clear retention, CAC payback within 12–24 months.

Series B

• Purpose: Scale the scaled wedge; expand team; new markets.
• Round size: $20M–$60M.
• Valuation: $150M–$500M.
• Lead investors: Growth funds, Series B specialists (Insight, Bessemer, ICONIQ).
• Metrics expected: $5M–$20M ARR, net-revenue retention > 110%, clear unit economics.

Series C and beyond

• Purpose: Category leadership, international expansion, acquisition funding.
• Round size: $50M+ (often $100M–$500M).
• Valuation: $500M–$10B+.
• Lead investors: Crossover investors (Tiger, Coatue, Dragoneer, DST), late-stage VCs, PE growth arms.
• Metrics expected: $20M+ ARR, profitability trajectory visible, IPO-readiness forming.

Mega rounds (D, E, F, G)

• Now routine for AI category leaders.
• OpenAI’s $122B and Waymo’s $16B in 2026 pushed round sizes that didn’t exist 5 years ago.
• Lead investors: Sovereign wealth, hyperscalers, crossover funds, late-stage VCs.

The Series A crunch

In most cohorts, 60–70% of seed-funded U.S. startups never raise a Series A. Typical causes:

1. Not enough revenue/retention velocity.
2. Market is too small or slow.
3. Team fragmentation.
4. Cash runway mismanaged.

Practical takeaway

1. Founders: Don’t optimize for round title — optimize for runway, milestones, and investor fit.
2. Investors: Stage discipline (sticking to your thesis) protects returns better than chasing hot stages.
3. Operators: Understand Series A metrics 18 months before you need them.

Further reading

• Crunchbase Q1 2026 data: https://news.crunchbase.com/venture/record-breaking-funding-ai-global-q1-2026/
• NVCA 2026 Yearbook: https://nvca.org/press_releases/nvca-releases-2026-yearbook-charts-a-venture-industry-in-transition/