Pro rata rights

Every new round of funding dilutes existing owners. A pro rata right is an investor's tool against that dilution. It gives the investor the right, but not the obligation, to buy enough of a new round to keep its ownership percentage. Seed funds care about it because their best companies are the ones where they most want to keep their stake. Founders care because pro rata commitments use up part of every future round.

This page is general information, not legal, tax or financial advice. The numbers below are hypothetical. Your own rights depend on your signed agreements, so have a lawyer confirm how they apply to a specific round.

How a pro rata right works

The math is simple. If an investor owns 8 percent of the company on a fully diluted basis, its pro rata share of a new round is 8 percent of the new shares. Buying exactly that amount leaves it at 8 percent after the round. Buying less leaves it diluted. Buying nothing means it falls by the same fraction as every other existing holder.

The right usually comes with a notice process. The company tells eligible holders about a planned issuance. They then have a set number of days to say how much they want. Some agreements let holders claim unused allocations that others decline, which is sometimes called an overallotment.

Where the right comes from

• The NVCA Investors' Rights Agreement. The model agreement, part of the NVCA model legal documents, includes a right of first offer on future stock issuances for Major Investors. NVCA updated this agreement in October 2025.
• Y Combinator's pro rata side letter. YC publishes an optional letter that goes with its post-money SAFE. YC's user guide says the right now applies to the round in which the SAFE converts, not the round after. It can only be used with forms that have a post-money valuation cap.
• Side letters with individual investors. Some angels and funds negotiate a letter of their own. Track every one of these, because they add up.

Standard agreements carve out issuances that do not trigger the right. Typical exclusions include employee option grants, shares issued on conversion of preferred stock and shares issued in an acquisition or to a lender. The list is usually defined as exempted securities in the charter or the rights agreement.

Worked example: a seed fund at the Series A

All figures are hypothetical. A seed fund owns 8 percent of a company. The company raises a $10 million Series A at a $40 million pre-money valuation, so the new investors buy 20 percent of the post-money company. Every existing holder's percentage shrinks by a fifth unless it buys in.

The full pro rata amount is 8 percent of the $10 million round, or $800,000. That buys 1.6 percent of the post-money company, which added to the diluted 6.4 percent brings the fund back to 8 percent. The super pro rata line shows why new leads dislike that right: it takes twice the allocation and grows the earlier investor's stake.

Why investors value the right

Venture returns are lopsided. A fund often makes most of its money from a small number of companies. When one of those companies raises its next round at a higher price, the pro rata right is the seed investor's ticket to put more money into a winner it already knows. Without the right, a hot round can fill up with new investors and leave the early backer out.

That is why seed funds sometimes accept a lower valuation in exchange for a firm pro rata commitment. It is also why they hold back part of each fund as reserves for follow-on checks. For founders the right has value too: an existing investor who takes its pro rata sends a clear signal of confidence to the new lead.

When pro rata meets a new lead

New lead investors usually want a minimum ownership. Pro rata rights from earlier investors come out of the same round. Here is a second hypothetical: a $10 million Series A in which the lead wants $8 million.

The lead's $8 million plus $1.7 million in pro rata claims leaves only $300,000 for anyone else. If the company wanted room for a strategic investor or new angels, it has three options: enlarge the round, ask existing holders to take less or ask the lead to take less. All three are common. The negotiation goes better when founders map these claims before they start pitching.

What Palo Alto founders typically ask

Should we grant pro rata to every angel?

Many founders limit pro rata to investors above a set check size, which matches the Major Investor idea in the NVCA documents. Small rights across many angels can still add up. They also make every later round more complex to administer.

Does it look bad if a seed investor skips its pro rata?

It can. New investors sometimes read a skipped pro rata as a signal, which is often called signaling risk. Funds skip for many reasons, including fund size and reserve policy, so ask your seed investors early what they plan to do. Our seed funds guide suggests asking every fund about its reserves before you take its money.

Can a large fund's pro rata crowd out the next lead?

Yes, especially when a multistage firm led the seed. Firms that invest from seed through growth, such as Sequoia Capital or Lightspeed, may want to keep a large stake. Discuss expectations for later rounds before you accept a seed term sheet from any investor.

Can pro rata rights be waived?

Most agreements let a majority of the holders waive the right for everyone in a particular round. Read the amendment and waiver clause. Then confirm who must sign.

Practical tips

1. Keep a list of every holder with a pro rata right and its current percentage.
2. Grant rights at the Major Investor level instead of one by one.
3. Avoid super pro rata unless it buys you something important.
4. Tell your new lead early how much of the round existing holders may claim.
5. Remember that pay-to-play terms in a down round may require pro rata participation. See our down rounds guide.

Frequently asked questions