See the “dual class” structure he managed to set up early on to preserve control.

https://www.vox.com/technology/2018/11/19/18099011/mark-zuck...

This was made popular by Larry and Sergey in 2012: https://www.sec.gov/Archives/edgar/data/1288776/000119312512...

It’s really only possible if the company/investment is so compelling that investors will invest with virtually no control.