Every S&P 500 company as a bubble, its area proportional to its market capitalization as of , grouped by sector. Click a company for its details; scroll or pinch to zoom in on the small ones.
Press play (or drag the timeline) to go back week by week to December 2008. A company only appears while it was in the S&P 500, but the history covers just the companies in the index today, so earlier years have fewer bubbles than the index really had.