Let’s not kid around, IBM is nearly an 11% weight in the price-weighted Dow Jones Industrial Average. What happens to it on any given trading day matters and can potentially mislead investors over the true performance of markets overall. This is why the DJIA is often referred to as “window dressing for the tourists” and why most market strategists focus on the S&P 500 Index instead. It gives a better picture of conditions than does the DJIA. Below is the breakdown of current weightings.