Fundraising discussions often focus on valuation, but founder ownership after the round depends on more than the headline number. New investment, option-pool expansion and existing convertibles can all change dilution.

A scenario model helps founders compare offers on the cap table rather than only on valuation.

Start with the fully diluted cap table

Include issued shares, existing options, warrants and any instruments that will convert in the financing. Using only currently issued common shares can understate dilution.

Model new money as a percentage of post-money ownership

If an investor puts in $5 million at a $20 million pre-money valuation, the simple post-money value is $25 million and the investor owns 20% before other adjustments.

Option-pool changes can alter that result for existing holders.

Option-pool top-ups matter

Investors may require the company to increase the employee option pool before the financing. If the top-up is included in the pre-money capitalization, existing shareholders absorb most of the dilution.

Model both “pool before” and “pool after” cases.

Convertible instruments can change the math

SAFEs, notes and other convertibles may have caps or discounts. Their conversion should be included before comparing term sheets.

Small instruments can become material after several bridge rounds.

Compare ownership under several valuations

Create a table showing founder, employee and investor ownership under multiple pre-money valuations and financing sizes. This makes the tradeoff between cash raised and dilution visible.

Do not optimize ownership at the expense of runway

Raising too little to preserve a few percentage points can force another financing under weaker conditions. Dilution should be evaluated together with the runway and milestones the round buys.

Model a future round as well

Today’s option pool and ownership affect the next financing. Add a hypothetical future round to understand how current decisions compound.

This is particularly useful for founders planning a rapid growth cycle.

Liquidation preference is separate from percentage ownership

Two investors with the same ownership percentage can have different economic outcomes depending on preference terms. Cap-table dilution is only one layer of financing economics.

Our article on AI startup financing terms covers downside preference structures.

Keep employee ownership visible

A larger option pool can be strategically useful when the company needs senior hires. Model not only founder dilution but whether the remaining pool can realistically support the hiring plan.

Use exact share counts for final negotiation

Percentage models are useful for scenarios, but final documents should reconcile exact securities, conversion mechanics and pool size with legal counsel.

Model dilution in absolute founder shares as well

Percentages are intuitive, but exact share counts help founders understand how option grants, conversions and future rounds interact. Keep a scenario sheet where every financing case produces a post-round share count for founders, employees and investors.

This is useful when several instruments have different conversion mechanics. A SAFE with a cap, an option-pool top-up and new preferred shares can make mental percentage math unreliable. The model does not replace legal documents, but it gives the management team a consistent economic view before negotiating details with counsel and investors.

The best term sheet is not always the highest valuation

Founders should compare how much capital the round provides, what ownership remains, what pool is available and what rights accompany the investment. Dilution scenarios turn those tradeoffs into numbers before negotiations become emotional.