How much will the next round dilute you?

Every funding round issues new shares, shrinking your percentage. See your ownership before and after a raise — including any new option pool — and what your stake is worth at the new valuation. Just raised? Enter the round that already happened to see exactly how much it diluted you — or model the next one before it does.

Written & maintained by the PrivateTechShares team · Published September 2026 · Reviewed September 2026

Your shares — how many you hold

Total shares before the round — fully-diluted

New money raised ($)

Pre-money valuation ($)

New option pool added (% of post-round) — optional; 0 if none

Your ownership after the round

—

down from your pre-round percentage

Ownership before—

New shares issued (investors)—

Option pool shares added—

Dilution—

Your stake value at post-money$—

Method and data privacy ↗

How we keep this accurate. We write from primary sources — official tax authorities (HMRC, IRS), financial regulators (FCA, SEC) and company filings — date every page, and review them regularly. This is independent, educational information, and deliberately not a substitute for professional tax, legal or financial advice on your own situation.

A rough illustration — not investment advice. It assumes a priced round at the stated pre-money, computes the new investor shares from the price per share, and (optionally) grows an option pool as a percentage of the post-round fully-diluted total. It ignores convertible notes/SAFEs converting, anti-dilution provisions, and share-class differences. Real term sheets vary; treat this as directional.

Dilution is normal — but compounding. Each round trims your percentage, and by exit an early stake can be a fraction of what it started as. That’s one reason some founders and early employees sell a portion earlier, rather than riding every future round with a shrinking slice.

What do you want to do next?

Want to sell before you’re diluted again?

Take some off the table now: sell part of your stake privately while you still hold a meaningful percentage.

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Questions people ask

How does a funding round dilute my ownership?

A priced round issues new shares to investors. Your share count stays the same, but the total number of shares grows, so your percentage of the company falls. If the round also adds or tops up an employee option pool, that issues further shares and dilutes you a bit more.

How do I calculate dilution from a new round?

Work out the price per share (pre-money valuation divided by the total shares before the round). Divide the new money raised by that price to get the new investor shares. Add any new option-pool shares. Your new ownership percentage is your shares divided by the new, larger total. The drop from your old percentage is your dilution.

Does dilution reduce the value of my shares?

Not necessarily the value — a round done at a higher price can increase your stake's value even as your percentage falls. Dilution reduces your ownership percentage; whether your value rises or falls depends on the valuation. But your slice of any future exit is based on that shrinking percentage, which is why some people sell part of their stake earlier.

General information only — not financial, tax or legal advice. Every situation is different; confirm your own numbers with a qualified adviser. PrivateTechShares is an education and tools service: it is not a broker or marketplace, does not introduce buyers and sellers, does not hold funds, and does not execute or advise on transactions. Figures use simplified assumptions and exclude many real-world factors.