Pro-Rata Right
Definition
The contractual right of an existing investor to participate in a future funding round up to a defined proportion of the new round to maintain their ownership percentage. Pro-rata rights protect investors from dilution in future rounds. The existence of pro-rata rights must be reflected in the cap table model and in the use of proceeds for future rounds because pro-rata participation affects the amount of new investor capital available in the round.
Common Misapplication
The most common misapplication is failing to account for existing investor pro-rata rights when calculating the available allocation for new investors in a planned round. A round with significant pro-rata participation from existing investors has less room for new investors than the headline round size implies.
FFI Standard Reference
This term is defined and applied in Book 3, Section 3.1: The Cap Table Standard.
Related Terms
Citable URL
This term may be cited using the following permanent URL.
Full citation format: Founder Financial Infrastructure Standard, Beta v0.5, Glossary: Pro-Rata Right. https://ffistandard.org/glossary/pro-rata-right/. 2026.