[polshaw]

I don't think you know nearly enough to make that claim. You don't know what value each party is bringing, or their roles, and you don't know how much was done before OP joined. You don't know if the business has any particular strengths.

Assuming significant work was done before OP joined, equal equity is not realistic (or fair). Also, are the others taking any money out (i'm guessing not?). There can of course be some value in ideas and traction (although AFAICT there isn't a lot unique nor is there a lot of traction). Moreover, i'm guessing most big decisions are not made by OP since he seems to be relegated to employee. Only if OP feels they are crucial and replaceable should he go for 1/3 (or more). From the little i know, 20%+ would be a good aim. If you think you can do better elsewhere (that is, you don't believe the business has unique strengths) then consider that.