There are no hard and fast rules, but for post-series A startups in Silicon Valley, the table below, based on the one by Babak Nivi, gives ballpark equity levels that many think are reasonable. These would usually be for restricted stock or stock options with a standard 4-year vesting schedule. They apply if each of these roles were filled just after an A round and the new hires are also being paid a salary (so are not founders or employees hired before the A round). The upper ranges would be for highly desired candidates with strong track records.
Chief executive officer (CEO): 5β10%
Chief operating officer (COO): 2β5%
Vice president (VP): 1β2%
Independent board member: 1%
Director: 0.4β1.25%
Lead engineer 0.5β1%
Senior engineer: 0.33β0.66%
Manager or junior engineer: 0.2β0.33%