I wouldn't invest in a single company nor would I try invest in specific companies. This is because I believe in the so called "Efficient-market hypothesis"[1].

I wouldn't invest in a single company nor would I try invest in specific companies. This is because I believe in the so called "Efficient-market hypothesis"[1]. tl;dr: "one cannot consistently achieve returns in excess of average market returns on a risk-adjusted basis, given the information available at the time the investment is made" There are many studies that have shown this. Even if you think you are better informed than the average Apple shareholder - this doesn't matter in the long-run. You may be lucky of course and make a lot of money - but in the long-term average case investing in specific companies is not better than investing in something like the Dow Jones. Also - the stock market is a highly irrational market that can be shown by a little experiment - I will make it concrete: As 100 people the following question: Do you think that you know more about Apple than the average Apple investor? Yes or no? In a perfect world you should get 50 x "yes" and 50 x "no" as an answer. But in reality more than 50% answer with "yes".