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Ownership and dilution

Simulate a simple investment or stake transfer using declared bases.

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Tool options
01

Current ownership

Current ownership

Use anonymous identifiers. Personal names are not needed.

Participant A
Participant B

Amounts: 1000.00 or 1,000.00. A decimal comma without thousands separators also works.

Step 1/2
How it works and limits

Information needed

Date, currency, anonymous participants, percentage or unit basis and simple transaction terms.

See how investment into the company or a stake transfer changes reported ownership. Simplified assumptions do not determine fair value, ownership rights or ideal negotiation terms.

Method and assumptions

  1. Post-money = pre-money + investment. New investor = investment/post-money; existing ownership × pre-money/post-money.
  2. For a post-money basis, pre-money = post-money − investment and must be positive. Economic equity value is not nominal share capital or enterprise value including debt.
  3. By units: price = pre-money/previous units; new units = investment/price. Fractions are flagged for instrument adjustment.
  4. A secondary sale preserves total units and transfers them from seller to buyer. Mixed transactions follow the declared order. Percentage-point and relative reductions differ.

Limits

  • Secondary sale money goes to the seller, not automatically into company cash. Unknown bases are not completed.
  • Excludes SAFEs, convertible notes, caps, discounts, preferences, anti-dilution, multiple classes, options and ESOP. These receive a review checklist. YC documentation is not a contract for a Brazilian company.
  • Percentage tolerance: 0.01 point. Quantities up to 1 trillion; displayed values do not establish rights.
  • Money is stored as integer cents. Rates retain internal precision; display uses up to six decimals.
  • An empty field means not provided. Zero is a known value.
  • Limit per amount: 10 billion currency units; dates from 1900 to 2200. Monetary amounts with English thousands separators are normalized when leaving the field, before calculation.
  • Language does not change the currency or imply international coverage.
  • Inputs and results remain in this browser’s memory. Reloading or clearing removes the data.

Method version: 333-tools-2026.10.08-v1

Method sources

Sources checked on 8 October 2026