What are pro-rata rights and why do investors care so much?

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. Not legal advice.
Hypothetical question

Every investor I talk to asks about pro-rata rights. I vaguely understand it means they can invest in future rounds, but why does it matter? Should I give it to everyone?

Illustrative response

Should you give pro-rata to everyone? No. Here's why:

1. Your Series A lead will want to own ~20%. If all your seed investors exercise pro-rata, there's less room for the lead.

2. Some seed investors write $25K checks. Do you really want 15 people with pro-rata rights cluttering your round?

Typical approach: Give pro-rata to your lead seed investor and major checks ($100K+). Smaller angels get standard SAFE without pro-rata, or pro-rata with a minimum exercise amount.

Illustrative response

Watch out for MFN (Most Favored Nation) clauses in your SAFEs. If you give one investor pro-rata, and another investor has MFN, they can claim pro-rata too.

YC's post-money SAFE includes pro-rata by default. If you're doing custom SAFEs without pro-rata, make sure they don't have MFN that triggers off other SAFEs.

Illustrative response

The registered agent requirement trips up a lot of first-time founders.

Illustrative response

I went with Delaware for the legal protections. Worth considering even for small businesses.