So, I'm part of a secondary market. I was looking at their valuation in November and considered picking up some shares, when insiders / investors were selling s

So, I'm part of a secondary market. I was looking at their valuation in November and considered picking up some shares, when insiders / investors were selling shares at a $15bn valuation. Now they opened at $30bn. Where did the increase in share value come from? Just the liquidity of going public?