Probably around 10%. Which isn't bad at all. If he negotiated really well his early round, it could be 15%. Also, keep in mind that if he owns 10%, it doesn't

Probably around 10%. Which isn't bad at all. If he negotiated really well his early round, it could be 15%. Also, keep in mind that if he owns 10%, it doesn't mean he got $17M (10% of $170M). VCs who invested money may have preference rights. For instance, if they put $20M in Mint, they could take the $20M out of the purchase price. Then, there is only $150M to share, and that's what Aaron would get 10% of. Either way, he's fine :-)