From the questions in the comments here on HN, it seems clear that everyone else is in the same boat, not really getting why this is any different from google finance.
You need to experiment with better visual ways of communicating that the blue 'market index' curve in the graph is something you invented, defined by the pie chart to the right.
It also wouldn't hurt if there was some unobtrusive way for you to emphasize why that's important. You're trying to isolate market movements out of stock movements, so that you can correlate news with times when the stock diverges from what would be expected based on the market and the industry/sector it's in. To me, that's great, but neither your intention to do that nor the effect of everything you've done to try to illustrate that is quite coming across.