The latest 13F reporting period has come and gone, and Insider Monkey is again at the forefront when it comes to making use of this gold mine of data. We at Insider Monkey have plowed through 821 13F filings that hedge funds and well-known value investors are required to file by the SEC. The 13F filings show the funds' and investors' portfolio positions as of March 31st, a week after the market trough. We are almost done with the second quarter. Investors decided to bet on the economic recovery and a stock market rebound. S&P 500 Index returned almost 20% this quarter. In this article we look at how hedge funds traded American Tower Corporation (NYSE: AMT ) and determine whether the smart money was really smart about this stock.