Amazon. ...closely, maybe, tied with Apple...but by looking at their one year charts...it's clear Amazon is the one with the momentum , The other options are not serious contenders for that historic, benchmark bragging right. Who knows...maybe in six months or less, it will happen. Amazon has alot of promising things on their plate...it's virtually expanding into anything it can and wants to. Insurance, groceries, robotics/automation, etc etc
I'd vote for Amazon. Without innovation, Apple is going to stagnate. Their precious smart-device market is too saturated now and without Jobs at the helm, where is the innovation? Amazon still has many worlds left to conquer, because they have many more tendrils out there. Amazon is such a behemoth that a certain free-world leader is scared of them and keeps trying to poo upon them. They are too smart for the likes of those fogeys. Meanwhile, Apple is starting to feel like the IBM of the 1990s.
Anything can happen but for now I think I would vote for Google with Amazon as a close second mainly because of Google's innovation that is always a few steps ahead and their innovation is broad-based that touches pretty much in all areas possible it is a manufacturer of something. As fast as Amazon grows, it is still confining itself so far as a merchant, not producing or manufacturing but selling something. Now if Amazon develops into financing and banking area then it would open up tremendous profit potential and that would be a major market cap booster for sure. But still the manufacturer/producer would always have a slight edge as they are the ones who are creating value that serve as the foundation for all the rest of the segments of the economy which are equally important.
I'd be willing to bet.... with absolutely nothing changing.... if AMZN did a 20 for 1 stock split and the price was $75/share.... the psychological effect of this would have the shares at $100 in no time. That would put them at a trillion. Pretty obvious fundamentals don't matter... the share price is based purely on herd mentality... so $75 to $100 is nothing. CNBC could orchestrate that in two days. It would be like an IPO again.