Indeed, asked about trends he is seeing in the secondary market, Prasad notes companies are staying private longer, prompting more of them to think about “interval liquidity programs” that let employees and early shareholders sell during pre-set windows.

https://techcrunch.com/2018/07/25/in-hot-market-for-secondary-shares-one-player-equidate-just-locked-down-50-million-in-new-funding/