Equity is stock in the company. If he's a cofounder, it shouldn't really be thought of as "giving" him 15% -- that sort of implies that you're the sole founder/

Equity is stock in the company. If he's a cofounder, it shouldn't really be thought of as "giving" him 15% -- that sort of implies that you're the sole founder/decision maker and he's an employee, doesn't it?