Pro-rata rights

Pro-rata (participation) rights let an investor buy enough of a future financing to maintain their ownership percentage. Own 15%, next round sells 20% of the post-money company, and the investor may buy 15% of the new shares issued (mechanics vary by document) so they are not washed out.

Investors want this because ownership toward fund returns is power-law math. Founders care because a crowded pro-rata table can leave little allocation for a new strategic lead.

Super pro-rata lets an investor buy more than their maintenance amount — expanding ownership in later rounds. Powerful for a lead you love. Painful if granted widely.

The big idea

A season-ticket holder who may buy the same fraction of any newly printed tickets is pro-rata. Super pro-rata is the right to buy extra newly printed tickets before strangers. The analogy breaks on pool refreshes: the share math in the documents, not the dinner-party fraction, is what closes.

Side letters on SAFEs often grant pro-rata too. Track them on the cap table before Series A closes. A pile of small SAFEs with pro-rata side letters makes the next round a logistics nightmare.

Walking through it

Post-Series A, Fund A owns 20% with full pro-rata. Series B will sell 25% of the post-money company for $20M (post = $80M, pre = $60M). Fund A's maintenance check is roughly:

20% × 25% × $80M = $4M of the $20M round

Exact shares depend on pool refreshes. If Fund A also has super pro-rata up to 2×, they could demand up to ~$8M of the round — half the raise — which may crowd out the new lead unless you negotiated a cap.

Another path, from Series A on the cap table: Series A owns 20%, B sells $25M of a $125M post (20% new). Maintenance ≈ 20% × $25M = $5M. Then old stake dilutes to 16% and the new $5M is 4%, so Series A holds 20%. Founders usually do not get this unless they invest cash. Employees almost never do.

Common mistakes

• Giving super pro-rata to everyone who asked. Save it for a lead you want more of.
• Forgetting SAFE side letters. They show up as allocation fights at the priced round.
• Assuming founders have the same right. They do not, without writing a check.

Check yourself

You own 20%. The next round sells 20% of a $125M post for $25M. About how much is full pro-rata?

About $5M — 20% of the new $25M.

Why do founders limit who gets super pro-rata?

Those investors can take a large slice of the next raise and crowd out a new lead.

Key takeaways

• Pro-rata is the right to buy enough new shares to hold your percent.
• Super pro-rata expands ownership and should be scarce.
• Track SAFE side letters; they are real allocation.

Further learning

Control terms

Series A on the cap table