Pro Rata Rights
An investor's contractual right to participate in future funding rounds to maintain their ownership percentage.
Pro rata rights (also called "participation rights" or "preemptive rights") allow an existing investor to invest additional capital in future rounds to maintain their ownership percentage. If an investor owns 10% and the company raises a new round, pro rata rights let them invest enough in the new round to stay at 10%.
Pro rata rights are standard in most institutional venture deals and are highly valued by investors because they allow them to double down on winners. For founders, pro rata rights are generally benign: they provide a ready source of capital for future rounds and signal ongoing investor confidence. However, they can become complicated when multiple investors all want to exercise their pro rata, potentially leaving little room for new investors.
In practice, not all investors exercise their pro rata rights. Some funds lack the capital for follow-on investments, or they may have lost confidence in the company. Whether existing investors exercise their pro rata is itself a signal: if insiders decline to participate, new investors may wonder why.
Example
An investor owns 8% after a seed round. The startup raises a $5M Series A, selling 20% of the company. The investor's pro rata right allows them to invest $400K (8% of $5M) in the Series A to maintain their 8% ownership, rather than being diluted down to approximately 6.4%.
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