Definition
Dilution is the cost of growth capital. Founders should expect 20-30% dilution per round. Over a company's life from founding to IPO, founders typically end up with 5-15% ownership. GitDealFlow helps founders optimize dilution timing, raise when engineering momentum is peaking for best terms.
How it works in practice
Dilution is the reduction in an existing shareholder's ownership percentage caused by issuing new shares. Every priced round, option pool grant, and convertible conversion creates new shares, and everyone who does not receive them, founders included, is diluted. The math is simple: if you own 20% of 1,000 shares and the company issues 250 more, you now own 20% of 1,250, 16%.
Dilution is the price of growth capital, and the question is whether the trade is good. Raising $5M at a $20M pre-money costs roughly 20% of the company; if that capital multiplies the company's value several times, the founder's smaller percentage of a much larger pie is worth far more. The mistake founders make is optimizing against dilution alone rather than against value created per point given up.
Dilution compounds across rounds, option pools, and conversions, founders should model the full path, not each round in isolation. The option pool is a subtle driver: it is usually created before the round and carved out of the pre-money, so its dilution lands on founders rather than new investors. GitDealFlow's public engineering data, commit velocity, contributor growth, and repository expansion across 350+ startups, helps founders pick the moment to raise when momentum is strongest, which is when dilution costs the least per dollar raised.
Key points
- Dilution = ownership percentage lost to newly issued shares; it is the cost of capital.
- New shares come from priced rounds, option pools, and conversions, model all three.
- Dilution only matters relative to value: a smaller percentage of a much bigger company wins.
- The option pool carve-out typically dilutes founders, not new investors.
- Raising when momentum peaks gets the best terms per point of dilution.
Frequently Asked Questions
How much dilution is normal?
Seed round: 15-25%. Series A: 20-30%. Series B: 15-25%. Series C+: 10-20%. Employee option pool: 10-20% total. GitDealFlow's momentum data helps founders raise at peak negotiating leverage.
What causes dilution?
Any issuance of new shares: a priced financing, the creation or expansion of the employee option pool, the conversion of SAFEs and convertible notes, or a reverse stock split. Each issuance spreads the same company over more shares, reducing every existing holder's percentage. Buybacks and repurchases are the rare way to reverse it.
How do option pools affect dilution?
The option pool, shares reserved for future employees, is usually created right before a priced round and carved out of the pre-money valuation. That means the pool's dilution is borne by the founders and existing holders, not the new investors, who price their investment after the pool. The larger the pool, the more founder ownership it quietly costs.
What's the difference between dilution and anti-dilution protection?
Dilution is the general reduction of ownership from new share issuance, which affects everyone. Anti-dilution protection is a contractual clause for investors that adjusts their conversion price if a later round prices below theirs, it protects specific investors in a down round, and its effect usually lands on founders and other common holders.