Founder ownership after Seed to Series B (cap table outcome)

TL;DR outcome

• A typical Seed-A-B path leaves founders with ~35-45% ownership (depending on option pool and round size).
• At a $250M exit, that range is roughly $87.5M to $112.5M to founders.
• An 8% option pool and smaller round sizes add meaningful ownership without changing the exit value.

The situation

You want a clean, round-by-round ownership view without a full spreadsheet. This outcome model treats each round as a standard priced equity financing with a fixed option pool at the start.

Inputs that matter (and which ones do not)

Matters most

• Pre-money valuations and round sizes.
• Option pool size.

Matters, but less

• Founder count (affects per-founder split).

Does not matter here

• Liquidation preference stack, participation, or pro-rata rights.

Interactive model

Breakpoints / inflection points

The breakpoints table shows the exit values required to hit $10M, $50M, and $100M of founder proceeds. This is useful when the board is debating valuation ranges.

Worked example (numbers)

What changes if...

• Option pool shrinks: dropping from 10% to 8% can add multiple points of founder ownership.
• Series B is larger: a 25% Series B dilution compresses founder ownership by several points.
• Exit valuation rises: every extra $50M at exit can add $15-20M to founders depending on ownership.

Common mistakes

1. Forgetting option pool dilution when quoting founder ownership.
2. Assuming round dilution is fixed without checking valuation.
3. Ignoring the compounding effect of three rounds in a row.

Checklist / next steps

• Confirm option pool target in your term sheet.
• Model a smaller Series B and a larger Series B as a range.
• Use the Cap Table Calculator for detailed rounds and exits.

References

• NVCA Model Legal Documents
• Carta dilution data

Last updated

• 2026-01-23: initial publication with base and capital-efficient scenarios.