How Dilution Works Across Funding Rounds
Every funding round dilutes your ownership. Understanding what to expect at each stage helps you plan for the long term and negotiate more effectively. Here is a breakdown of typical dilution from pre-seed through Series C.
Pre-Seed / Friends & Family
Pre-money valuation range
$1M-$3M
Typical founder ownership after
90-95%
Founders typically retain near full ownership. Capital comes from angels, friends, and family at a simple safe note or a very low pre-money cap. Dilution is minimal but the company is valued on potential alone.
Seed Round
Pre-money valuation range
$3M-$15M pre-money
Typical founder ownership after
70-85%
The first institutional round. Most seed rounds use a SAFE or convertible note to delay the pricing conversation. If priced, a 15% option pool top-up often comes alongside the round, meaning effective dilution exceeds the headline percentage.
Series A
Pre-money valuation range
$10M-$50M pre-money
Typical founder ownership after
50-70%
Series A brings lead VC investors and a priced round with a full term sheet. Investors typically seek 20-25% ownership. Combined with the option pool expansion, founder dilution of 20-30% per round is common. Anti-dilution provisions become standard at this stage.
Series B
Pre-money valuation range
$50M-$200M pre-money
Typical founder ownership after
35-55%
At Series B, investors are buying into demonstrated traction. Dilution can be slightly lower per round if valuations have grown significantly. However, previous investors may exercise pro-rata rights, adding further complexity. Cumulative dilution from seed through Series B often puts founders at 40-60% ownership.
Series C and Beyond
Pre-money valuation range
$200M-$1B+ pre-money
Typical founder ownership after
20-40%
Later rounds typically dilute less per round in percentage terms, but operate at much higher dollar values. Secondary sales sometimes allow founders to take chips off the table. By Series C, founding teams commonly hold 20-35% ownership collectively.
The Cumulative Dilution Problem
Each round looks manageable in isolation. Giving up 20% at seed seems fine. Another 20% at Series A is still fine. But the compounding effect is significant. If you start with 100% and give away 20% in each of four rounds, you end up with roughly 40% - not 20%.
The calculation: 100% x 0.8 x 0.8 x 0.8 x 0.8 = 40.96%. Each round multiplies the remaining stake. This is why founders often own less than expected after multiple rounds, even when each individual dilution seemed modest.
Use the calculator on the home page to model your specific rounds and see exactly where you end up. The multi-round simulator shows cumulative dilution across all rounds you add.
SAFE notes and delayed dilution
Simple Agreement for Future Equity (SAFE) notes delay the dilution calculation until a priced round occurs. The SAFE holder receives shares when the round happens, at a discount to the round price or at a valuation cap - whichever is more favourable. Founders often underestimate how much SAFEs dilute at conversion, especially if multiple SAFE rounds were raised at low caps.
Negotiating valuation vs. dilution
The two levers are how much you raise and at what valuation. Raising more at a higher valuation gives you more capital while keeping dilution the same. Raising less at the same valuation reduces dilution but also reduces your runway. The right balance depends on how much capital you actually need to reach the next meaningful milestone, not how much you can raise.