Looking for a particular stock? Search its ticker symbol here:
Drag boxes onto the grey canvas to filter stocks. Timeboxes select lines that are entirely within the box from left to right.
Click near the middle of a timebox and drag to move it around.
Click near the corner of a timebox and drag to resize it. The data is filtered discretely by weekly price, so if a box's width becomes thinner than 1 week, it will not filter at all and disappear once you stop dragging.
Rolling over lines to view individual ticker symbols works better on the zoomed in chart since there's less interference from other lines.