5 Silver Mining Stocks Poised to Rebound At the end of the day, large institutional money managers running big mutual funds and hedge funds drive stock prices, not insiders. That said, many of these savvy stock operators will follow insider buying activity when they agree with the insider that the stock is undervalued and has upside potential. This is why it's so important to always be monitoring insider activity and why it's twice as important to make sure the trend of the stock coincides with the insider buying. Recently, a number of companies' corporate insiders have bought large amounts of stock. These insiders are finding some value in the market, warranting a closer look at these stocks. Here's a look at a number of companies whose insiders have been loading up on their own stock recently per SEC filings.