American Tower (NYSE:AMT) has outperformed the market over the past 20 years by 6.13% on an annualized basis producing an average annual return of 14.61%. Currently, American Tower has a market capitalization of $109.61 billion. Buying $100 In AMT: If an investor had bought $100 of AMT stock 20 years ago, it would be worth $1,568.65 today based on a price of $234.67 for AMT at the time of writing. American Tower’s Performance Over Last 20 YearsFinally — what’s the point of all this? The key insight to take from this article is to note how much of a difference compounded returns can make in yo…