All 500 companies — bubble size = market capitalization
Market caps follow a power law — a few giants dominate while hundreds of companies are barely visible specks.
That's an 800x difference between the largest and smallest companies in the same index.
When you buy an S&P 500 index fund, you're heavily weighted toward a handful of tech giants.
The top 10 companies make up ~35% of the index. The bottom 250 companies combined are smaller than Apple alone.
Click a sector in the legend to highlight. The dominance of Technology is immediately visible.