If you're considering your endgame, you're probably looking at private equity. Most PE firms use a familiar formula: buy a majority stake and ask the owner to "roll equity"—re-invest part of the proceeds—into the newco they're building. The downside: you become a minority shareholder in a business you no longer control.  

There's another path: growth equity, which lets you take chips off the table via a secondary while maintaining control. That's the business John Ruffolo is in as Founder & Managing Partner at Maverix Private Equity (he also founded OMERS Ventures).