Obviously, no one has to renegotiate anything, but I'm asking what's fair. I can't evaluate my own number because I don't know what's happening at the bigger picture. If 30 programmers more skilled than I am are hired tomorrow, I'm probably getting a fair share. If some post-money marketing VP gets, say, 8%, I'm going to ask for a raise to at least that level or quit.
The other 2 people have no idea you are upset with the current arrangement. Waiting to see what happens with other hires and then getting angry just seems spiteful and jealous.
If you are unhappy with the current situation, you need to figure out if it is enough to force you to quit. If so, give them the option to re-negotiate to a favorable arrangement for both, or quit.
If you aren't willing to quit over it, ignore that factor completely and learn from the experience.