Sounds like your timing is going to cover this, but if your co-founders know you are leaving then have an obligation to disclose that to potential investors. If

Sounds like your timing is going to cover this, but if your co-founders know you are leaving then have an obligation to disclose that to potential investors. If I were them, I'd want this settled with you and out of the way before fundraising even started. "Hi, we just took your $500k and one of the founders is leaving. Yeah, we knew but didn't tell you." is not a place anyone wants to be. Forget what's contractually agreed upon and forget what's fair. The cap table affects the company's ability to raise money. That is a reason that founding shares should always include a vesting schedule or expiring "right of repurchase" so that premature departure of a founder does not result in a strange looking cap table. It's reasonable for investors to say: "Who is this guy who owns X% and what value are they delivering?" You'll have been there 18 months: 18/48 = 3/8 = .375. .375 * 33 ~= 12. Your owning 12% is explicable. "He was early, he delivered stuff, that's his initial equity proportional to the time he was in the boat." Best wishes with it.