I suspect that the reason those "newer" companies were able to have the majority of their gains reaped pre-IPO was that during that time period, it was easy to acquire capital from investors without resorting to public market IPOs, where as the era of google and apple have not got the same level of private investment.
And i think it has to do with low interest rates. During the google early years, it is difficult to obtain low-cost loans (for private investors that is). Therefore, public markets look like an easier path for companies to raise money.
The "newer" companies in your list are mostly post-GFC, during a period of ultra-low interest rate. This makes money easy for private investors to obtain, and so companies have an easier time getting funding from those private sources. The IPO is realistically not a funding mechanism, but an exit mechanism for those early private investors.
If you're familiar with Ray Kurzweil's work, I wonder whether this phenomenon might be related. Kurzweil notes that better technology begets better technology in a self-reinforcing and ever-accelerating cycle of technological advancement. His thesis implies rapidly evolving capital requirements. Massive amounts of nimble private capital, secure in the hands of highly competent people with relevant domain expertise, may well be an important precondition for continual acceleration.
I suspect that the reason those "newer" companies were able to have the majority of their gains reaped pre-IPO was that during that time period, it was easy to acquire capital from investors without resorting to public market IPOs, where as the era of google and apple have not got the same level of private investment.
And i think it has to do with low interest rates. During the google early years, it is difficult to obtain low-cost loans (for private investors that is). Therefore, public markets look like an easier path for companies to raise money.
The "newer" companies in your list are mostly post-GFC, during a period of ultra-low interest rate. This makes money easy for private investors to obtain, and so companies have an easier time getting funding from those private sources. The IPO is realistically not a funding mechanism, but an exit mechanism for those early private investors.