I'll preface this by saying that 10 years ago Apple was a $3 stock. A lot can change in 10 years. --- A few (IPOd) likely contenders: Google - Currently the

I'll preface this by saying that 10 years ago Apple was a $3 stock. A lot can change in 10 years. --- A few (IPOd) likely contenders: Google - Currently the second highest tech valuation. They seem to be one of the only companies putting serious resources in shaping the future (self driving cars, mining asteroids). I can totally see Google being the company that introduces personal assistant robots in homes. Amazon - Brick and mortar stores will continue to get outclassed by the online experience. Amazon will be THE way to shop, including groceries and everyday items. They will grow into their crazy high P/E and begin to expand margins. Apple - I think Apple will fall for a number of reasons, the biggest being the passing of Steve Jobs. Their products are great but they can't continue to grow the way they have the last 5 years (we are already starting to see this). They will continue to make solid products but I see them in the same vain as Microsoft circa '99. Facebook - I am a long-term believer of Facebook but acknowledge they are the riskiest of the others listed so far. They certainly have the opportunity to be the biggest though. It really depends on two things: 1) how they fend off competitors and 2) how they monetize. Ya, those are two pretty huge things to depend on but like it or not they have the potential to be the biggest company in the world in 10 years. A few non-IPO companies that have a shot: Twitter - I'm not really sure about Twitter. Are they a protocol? Are they a media company? Are they an advertising firm? There is something about them though that sticks. I can totally see them as the biggest social network in 10 years. I can also see them as being a huge advertising firm if they can get metrics of how tweets influence customers (e.g. if Lebron James tweets that he is getting McDonalds for dinner, what percentage increase in sales does McDonalds get within an hour of that tweet?). I can see Twitter being a $100b company in 10 years if they can figure out how to understand their influential data. Square - This company has the potential to monopolize phone payments. I can see our phones being the leading source of payments in the next few years so I think Square has the potential to get huuuuuge. Dropbox - I'm not too sure about Dropbox. They provide a great experience but I just don't know that they have the potential to be the biggest company in the world. Data storage will not get them there - they have to expand into something more. --- All that being said, I think Google and Amazon will fight for the biggest valuation in the world in 10 years. (Ignoring companies that haven't been started yet that revolutionize an industry, obviously.) Discloser: Long Google. Short Facebook via puts.