SpeedstrapA book from Third SphereAbout the book ↗

How much does a founder keep under a speedstrap path versus a VC path?

There is no fixed ownership percentage for either path: the result depends on every SAFE, priced round, option-pool change, and exit term. Compare both the percentage retained and the cash left for common shareholders after debt and preferences.

The book’s comparison is an illustration

Chapter 5 models one company with $191 million of equity raised and 13% founder ownership, versus a speedstrap scenario with $2.1 million of equity, $3 million of non-dilutive funding, and 60% founder ownership. Those are constructed scenarios, not a forecast or market median. The chapter’s complete model includes an option pool and exit preferences; these percentages cannot substitute for a real cap table.

For observed ownership patterns, the chapter cites Carta’s founder-ownership data. A benchmark describes a population; it does not determine the outcome of your financing. For definitions and cap-table components, see Carta’s cap-table guide.

Worked example: isolate the dilution

Simplified illustration, not the book’s full exit model. Start with founders owning 80%. Three rounds, each selling 20% of the post-round company, leave 80% × 0.8 × 0.8 × 0.8 = 40.96%. One such round instead leaves 64%. This calculation excludes SAFEs, pool refreshes, preferences, debt, taxes, and transaction costs.

At an assumed $50 million of distributable common equity value, those stakes correspond to $20.48 million and $32 million for the founder group, before tax. That is not the same as assuming a $50 million enterprise sale yields those amounts: obligations may reduce the equity available.

Compare complete paths

Model the cash required to reach customers, alternative financing costs, dilution, and exit waterfalls together. A smaller ownership percentage can still be worth more if the equity genuinely changes the business; a larger percentage does not repay debt or make an unviable company valuable.


This page is an original summary of an argument developed in Speedstrap, not an extract from the book.

From Chapter 5 of Speedstrap. Find the book on Amazon.

What is speedstrapping? · Meet the authors · Use the AI companion