Pro Rata Rights: How an Investor Keeps Its Percentage
Granting pro rata rights lets an investor buy enough new shares to hold its ownership percentage. Here is the check founders should run before agreeing.
A term sheet may offer pro rata rights to an existing investor as a loyalty perk. The trap is that the right is a percentage maintenance rule: an investor who starts with a 10% equity stake can use it to buy into later financing rounds and keep the same 10% position.
In a term sheet, pro rata rights sit among investor rights, but they are really a mechanic for a later round. They promise the chance to buy new shares, large enough to hold the old percentage, rather than a fixed share of the company.
The trap: a loyalty perk that locks in a percentage
Founders often think pro rata rights are a small courtesy. The investor already owns shares, so the perk feels like a way to stay engaged. The cost shows up in future flexibility: you may have to manage a cap and answer to an investor who can keep its stake while others get diluted.
That flexibility matters when the next round is oversubscribed. Oversubscription means more investors want shares than the company is selling. If the company cannot give every investor enough new shares, the pro rata right may be limited by the cap or by the shares the company can allocate. The right remains, but it is not a guarantee of unlimited money into the round.
The rule: buy enough new shares to hold the percentage
The math is a share count problem. Start with the current ownership percentage. Count the post-round shares. Subtract the shares already held from the number of shares needed to keep the percentage. The difference is the new shares to buy.
In the Widgets, Inc. seed example, FastCapital VC's $100,000 investment bought 50,000 shares at $2 per share and produced a 2.5% ownership stake. In the Widgets, Inc. Series A example, FastCapital would need to purchase 12,500 shares at $4 per share, totaling $50,000, to keep its 2.5% ownership. If FastCapital skipped the Widgets, Inc. Series A investment, its ownership would decline from 2.5% to 2%.
First Round Capital achieved a 5,000X return when Uber went public in 2019. That outcome does not mean every follow-on round produces a large return. It shows the percentage you protect can matter.
The check: turn the promise into a number
Run the allocation check before you sign. It turns a vague promise into a number you can compare against your round size, your cap, and how much future dilution you are willing to accept. Put the needed share count in the term sheet.
- Current ownership: record the percentage after the current round.
- Post-round share count: add the new shares to the existing shares.
- Shares needed = current ownership % x post-round shares minus shares held.
- Compare the gap: check the pro rata cap, oversubscription, and whether the investor can actually fund the amount.
If the investor skips, new ownership = current shares / post-round shares. That is the number to show the board and update in the ownership table before the round closes.
Negotiate the cap before the round, not after. A cap limits the maximum amount the investor can buy under the right. If the investor wants more, it can negotiate a higher cap, but that usually means more future dilution for everyone else. If the investor wants less, the company keeps more flexibility for new money.
Across 100,000 simulations, the never-follow-on strategy outperformed the always-follow-on strategy 54% of the time, while the always-follow-on strategy outperformed the never-follow-on strategy 46% of the time. That makes pro rata rights a tool: they only work if the investor chooses to use them.
Before you grant the right, put the cap in the term sheet. Show the investor the skip number, and compare the needed amount to the cap. The cap keeps the purchase bounded and the future ownership change visible.
