One of the most important principles of charting is that a chart is supposed to convey a clear message, bring some sort of data insight.
Looking at that chart (in several threads) I do not get the message. Hence the question comes to mind: "Does the data need a chart at all?".
To be clear, my comment is not mean as a critique, it's more a concern. For one, I'm not familiar at all with stock data, so I lack context, know how, experience, you name it. So, it can be that chart brings a lot of insights I'm simply not seeing, but others will. That's fine then.
The concern is that a lot of "technique" seems to be required to make the chart, and maybe people need to study it to make sense out of it. Generally speaking that's a bad practice.
Stephen Few has a couple of great books on the topic, I got to know him through Chandoo's blog, and I recommend them to anyone that needs to visualize data in a professional context. Having a better and deeper understanding of the principles behind charting is a must have.