I believe it’s very possible, just not standard.  A number of companies have adopted such measures to great effect for the founders to maintain power over investors [1], but not many have used similar legal tools in reverse to help spread the upside with earlier employees as suggested in the first comment.  Perhaps the standard should be for founders to get ‘super-voting’ shares and use some of the power to distribute better upside distribution.  Sell it in both directions, longer term stability and more employee alignment.<p>[1] <a href="http:&#x2F;&#x2F;www.businessinsider.com&#x2F;googles-co-founders-are-going-to-sell-44-billion-worth-of-shares-2015-2" rel="nofollow">http:&#x2F;&#x2F;www.businessinsider.com&#x2F;googles-co-founders-are-going...</a>