Every time you raise a round, your ownership percentage goes down. That is not a failure. It is the mechanism. The question is whether you understand exactly how much it goes down, what causes it, and whether the trade is worth it. Most founders find out the hard way after the term sheet is signed.
This guide breaks down how equity dilution works at each stage, with step-by-step cap table examples and the specific traps that catch founders off guard.
What is equity dilution?
Equity dilution happens when a company issues new shares, reducing the percentage ownership of existing shareholders. Your actual number of shares stays the same. What changes is the total number of shares outstanding, which shrinks your slice of the pie.
The upside: the pie itself is supposed to be getting bigger. Raising a Series A at a $20M valuation with 20% dilution is a better outcome than owning 100% of a company worth nothing. The problem occurs when founders dilute more than necessary, or more than they planned. Research on founder ownership across stages shows that at Series C, median combined founder ownership sits below 40%. Understanding the path helps you plan for it.
The dilution formula
Your post-round ownership percentage is:
New Ownership % = Your Shares / Total Shares After New Issuance x 100
Total shares after the issuance equals your current shares plus all new investor shares plus any option pool shares added before closing.
New investor ownership = Investment Amount / (Pre-Money Valuation + Investment Amount). At a $6M pre-money valuation with a $1.5M investment, the investor receives 20% ($1.5M / $7.5M). All existing shareholders are diluted from 100% to 80%.
Round-by-round example: Seed through Series C
The following traces a two-founder company from pre-seed through Series C. Each round assumes 20% dilution to incoming investors.
Pre-seed: before any outside capital
Co-founders split ownership 60/40, then set aside 10% for an ESOP pool and 0.9% for advisors.
| Stakeholder |
Ownership (%) |
| Co-founder A | 53.5% |
| Co-founder B | 35.6% |
| ESOP pool | 10.0% |
| Advisors | 0.9% |
After seed round: $1.5M at $6M pre-money
Seed investors take 20%. All existing stakes multiply by 80%:
| Stakeholder |
Post-Seed Ownership (%) |
| Co-founder A | 42.8% |
| Co-founder B | 28.5% |
| ESOP pool | 8.0% |
| Advisors | 0.7% |
| Seed investors | 20.0% |
Combined founder ownership: 71.3%.
After Series A: $5M at $20M pre-money
Series A investors again take 20%:
| Stakeholder |
Post-Series A Ownership (%) |
| Co-founder A | 34.2% |
| Co-founder B | 22.8% |
| ESOP pool | 6.4% |
| Advisors | 0.6% |
| Seed investors | 16.0% |
| Series A investors | 20.0% |
Combined founder ownership: 57.0%. Founders have given up 43% of their original stake.
After Series B: $10M at $40M pre-money
| Stakeholder |
Post-Series B Ownership (%) |
| Co-founder A | 27.4% |
| Co-founder B | 18.2% |
| ESOP pool | 5.1% |
| Advisors | 0.5% |
| Seed investors | 12.8% |
| Series A investors | 16.0% |
| Series B investors | 20.0% |
Combined founder ownership: 45.6%. For the first time, investors collectively own more than the founding team.
After Series C: $20M at $80M pre-money
| Stakeholder |
Post-Series C Ownership (%) |
| Co-founder A | 21.9% |
| Co-founder B | 14.6% |
| ESOP pool | 4.1% |
| Advisors | 0.4% |
| Seed investors | 10.2% |
| Series A investors | 12.8% |
| Series B investors | 16.0% |
| Series C investors | 20.0% |
Combined founder ownership: 36.5%. From inception to Series C, founders have experienced roughly 64% total dilution from their original stakes. The company is now valued at $100M+.
How much dilution is normal per round?
Typical ranges by stage: pre-seed 10 to 20%, seed 15 to 25%, Series A 20 to 30%, Series B 15 to 25%, and Series C and later 10 to 20%.
After Series A, median combined founder ownership sits around 57%. By Series B, founders and investors are roughly tied. By Series C, investors hold the larger stake.
The option pool trap most founders miss
Before every priced round, investors will ask you to expand the employee stock option pool. The request seems reasonable. The catch is in the timing.
Investors require the pool to be expanded before the round closes. The new pool shares are carved from existing equity, not shared with the incoming investor. The investor calculates their ownership percentage after the expanded pool already exists.
Example: you are raising a Series A with 20% dilution. Investors also require a 15% post-round ESOP pool. If the pool is created before closing, those shares come from your pre-money equity. Your actual dilution from the round is not 20%. It is closer to 35%.
The fix: model the fully diluted cap table before accepting any term sheet. Include the proposed pool expansion in your dilution math alongside the headline percentage.
SAFEs and convertible notes: deferred but not free
SAFEs and convertible notes delay dilution to a future priced round, but the terms of those instruments determine how much dilution eventually hits.
Valuation caps set the maximum valuation at which the SAFE converts. If your priced round values the company above the cap, SAFE holders receive more shares than new investors for the same money invested, increasing your dilution.
Conversion discounts (typically 10 to 20%) let SAFE holders buy equity at a lower price than the new round. Combined with caps, they can produce more dilution than founders modelled when the SAFEs were issued.
Pre-money SAFEs dilute all existing shareholders at conversion. Post-money SAFEs protect the investor percentage but dilute founders more. If you are raised on post-money SAFEs and are approaching a priced round, model the cap table carefully before the term sheet conversation. See what happens after you send a pitch deck for the typical investor process once you are in a live fundraise.
Anti-dilution provisions
Anti-dilution provisions protect investors in down rounds. They adjust the investor conversion price when the company raises equity at a lower valuation than the investor originally paid.
Broad-based weighted average: the most founder-friendly form. The price adjustment is partial and reflects the actual impact of the down round. This is the standard in most Series A term sheets today.
Full ratchet: the most investor-favourable form. The investor's price resets entirely to the new lower price, which can severely dilute founders and common stockholders. Negotiate against it unless you have no alternative.
Anti-dilution protections apply only to preferred shareholders. Common stockholders and option holders receive no equivalent protection.
How to protect your stake without turning down good investors
Raise what you need, not what you can get. Early capital is the most expensive you will ever take. At the seed stage, your valuation is at its lowest, and each dollar of investment purchases the largest share of your company.
Model the cap table before every round. Build a simple model that shows your post-round ownership under different scenarios: different valuations, pool expansion sizes, and SAFE conversion outcomes. Many founders who use Pitchwise to track investor engagement while fundraising also model cap table scenarios in parallel. See how to know if an investor has opened your pitch deck for how to track investor engagement during a live fundraise.
Negotiate on valuation, not just on amount. A higher pre-money valuation reduces the investor's percentage for the same capital, preserving more ownership.
Explore non-dilutive options between equity rounds. Revenue-based financing, venture debt, and grants can extend runway without an equity round, giving you time to build more value before your next dilution event. Each equity round also resets your option grant compliance requirements.
FAQ
How much equity should I give up in a seed round?
Typical seed rounds take 15 to 25% equity. The exact number depends on how much you are raising and your pre-money valuation. Giving up more than 30% in a single seed round is a signal the valuation may be below where it should be.
What is the option pool shuffle?
The option pool shuffle is the practice of requiring founders to expand the ESOP pool before a round closes, so the new shares come from founders' pre-money equity rather than being diluted proportionally with the incoming investor. It is standard in most venture term sheets. Understanding it helps you calculate your actual post-round ownership correctly.
How do SAFEs dilute founders?
SAFEs convert to equity at a future priced round at a price set by the valuation cap or discount. If multiple SAFEs with different caps convert simultaneously at Series A, the cumulative dilution can be significantly larger than founders expected when each SAFE was issued.
What is a down round, and how does it affect dilution?
A down round is when you raise equity at a lower valuation than your previous round. It triggers anti-dilution provisions for preferred shareholders, adjusting their conversion price and increasing total share count. Founders and common stockholders absorb this additional dilution because common stock has no anti-dilution protection.
Can I prevent dilution entirely?
No, but you can minimise it. Raising less capital, maintaining a higher valuation, and avoiding unnecessary SAFE stacking all reduce dilution. Non-dilutive financing options such as revenue-based loans, grants, and venture debt can bridge gaps between equity rounds without additional ownership cost.
