Gambling = Investing

I think they are both very similar. Isn't investing also something like gambling? I mean, you cannot really predict what will happen, say, in the stock market. Sure, you can say that a company is worth so-and-so amount of money, but the actual price of its share is determined by supply and demand. Surely this means that investing in stocks is very much just gambling? So, I would say that investing is just another form of gambling.