Equity Dilution Explained: How Funding Rounds Change Your Startup Ownership

When you raise venture capital, you exchange a percentage of your company for cash. This exchange — dilution — is permanent. Understanding it before you sign term sheets is one of the most important things a founder can do.

How Dilution Works

Pre-seed: you own 100% of your company (let's say 1,000,000 shares).

You raise a €500K Seed round at a €2.5M pre-money valuation. The investor's money buys new shares:

Post-money valuation: €2.5M + €500K = €3M Investor ownership: €500K ÷ €3M = 16.7% Your ownership: 100% − 16.7% = 83.3%

Shares: you still have 1,000,000 shares. The investor gets new shares equal to 16.7% of the new total. New shares issued: (0.167 ÷ 0.833) × 1,000,000 = ~200,480 new shares. Total pool: 1,200,480 shares.

Cumulative Dilution Across Rounds

By Series B, a founder who started at 100% might own ~50%. This is normal and acceptable if the company valuation has grown significantly — 50% of a €50M company is worth far more than 100% of a €2.5M company.

The ESOP Pool Dilution Effect

Investors typically require an employee stock option pool (ESOP) of 10–20% to be created before the investment closes. This pool is usually created from existing shares (pre-money), which means it dilutes founders before the investor's dilution is even applied.

• Pre-ESOP: you own 100%
• Post-ESOP: you own 85%
• Post-Seed (16.7% to investor): you own 85% × (1 − 0.167) = 70.8%

Ask investors to include the ESOP in the post-money calculation (rather than pre-money) to reduce this dilution effect.

Protecting Yourself with Anti-Dilution Provisions

If a future round is at a lower valuation than yours (a "down round"), anti-dilution provisions adjust your conversion price to protect value. The two types:

• Broad-based weighted average: moderate protection, common in European VC
• Full ratchet: maximum protection for investor, very unfavourable for founders — avoid if possible

Model Your Dilution Across Rounds

[👉 Use the Equity Dilution Calculator](/calculators/equity-dilution)

Enter your planned funding rounds and valuations to see how your ownership percentage changes — and what each round is worth at different exit valuations.