Capital & Financing
What Is Dilution?
Dilution is the reduction in an owner's percentage when new shares are issued, triggered by every priced round, option grant, and SAFE conversion. If a founder owns 6M of 10M shares (60 percent) and the company issues 2M new shares, total outstanding rises to 12M and ownership falls to 50 percent, a 10 percentage point dilution. Priced rounds typically dilute 15 to 25 percent each, and stacking SAFEs without modeling cumulative dilution is the most common and costly mistake.
Dilution is the reduction in your ownership percentage when new shares are issued. Every priced round, option grant, and Simple Agreement for Future Equity (SAFE) conversion dilutes the existing holders. The math is simple; the consequences are large.
The math
You own 6M shares of 10M outstanding, so 60 percent ownership. The company issues 2M new shares in a Series A. Total outstanding becomes 12M. Your shares are unchanged at 6M, but your ownership = 6M divided by 12M = 50 percent. Dilution = 10 percentage points.
Where dilution comes from
- Priced equity rounds: typically 15 to 25 percent dilution per round (Seed, Series A, Series B)
- Option pool expansions: 10 to 20 percent pool at Series A, smaller expansions (3 to 5 percent) at later rounds
- SAFE conversions: at the next priced round, SAFEs convert based on cap and discount. Aggressive caps can produce 20 to 30 percent conversion dilution.
- Convertible notes: similar mechanics to SAFEs
- Warrants: often attached to venture debt. Convert into 0.5 to 3 percent dilution typically.
Typical founder retention path
Bootstrapped founder pre-Series A: 80 to 100 percent. Post-Series A: 60 to 75 percent. Post-Series B: 45 to 60 percent. Post-Series C: 35 to 50 percent. You're trading dilution for capital and scale at every step.
The most common mistake
Stacking SAFEs without modeling the cumulative dilution. Each SAFE looks small on its own, but they compound. $1.5M in SAFEs at a $5M cap is 30 percent dilution when those SAFEs convert at the priced round. Founders who issued each $250K SAFE thinking it was small get a brutal surprise when the round closes and they suddenly own way less than they thought.
Frequently Asked Questions
how is dilution actually calculated?
New shares issued divided by total post-issuance shares. Your share count stays the same. The denominator grows, so your slice of the pie shrinks.
what causes the most dilution in early stages?
Priced rounds (15 to 25 percent each), option pool expansions (10 to 20 percent at Series A), and SAFE conversions (depends on cap, can be 20 to 30 percent).
how do i minimize dilution as a founder?
Raise less, negotiate SAFE terms aggressively, push for a tight option pool, and use non-dilutive capital where your unit economics support debt service.
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