At Insider Monkey we scour multiple sources to uncover the next great investment idea. For example, Federal Reserve has been creating trillions of dollars electronically to keep the interest rates near zero. We believe this will lead to inflation and boost precious metals prices. So, we are checking out this junior gold mining stock. Legal marijuana is one of the fastest growing industries right now, so we are also checking out stock pitches like " the Starbucks of cannabis " to identify the next tenbagger. We read hedge fund investor letters and listen to stock pitches at hedge fund conferences. We go through lists like the 10 most profitable companies in the world to pick the best large-cap stocks to buy. Even though we recommend positions in only a tiny fraction of the companies we analyze, we check out as many stocks as we can. Now we're going to analyze the new hedge fund action regarding Old Dominion Freight Line, Inc. (NASDAQ: ODFL ).