The Biggest Company of Every S&P 500 Sector

What We’re Showing

The 11 sectors of the S&P 500, each sector’s total market capitalization, the top 10 companies’ share of their sector's market cap, and the share of the largest company of the sector.

Data comes from S&P Dow Jones Indices and is updated as of June 28, 2024.

Key Takeaways

• Communication Services is the most concentrated sector by far, with the top 10 companies accounting for 97% of the sector's market cap.
• Sectors home to big tech companies like Amazon, Alphabet, and Microsoft, are among the most concentrated.
• Among all sectors, Amazon makes up the greatest share of their sector, accounting for a staggering 39% of the Consumer Discretionary sector’s total market cap.