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Gathering VIII · leaf 7 of 8
TOP 10 · MARKET CAP ÷ INDEX

TOP 10 · MARKET CAP ÷ INDEX — Peak Weight in the Market: Historical Champions on a Common Benchmark

Peak Market Cap Share Across Eras — Cross-era comparison of the maximum S&P 500 index weight commanded by successive market cap champions at their zenith.

The plate

TOP 10 · MARKET CAP ÷ INDEX — Peak Weight in the Market: Historical Champions on a Common BenchmarkAT&T 193213.0%Exxon Mobil 19299.8%General Motors 19557.7%IBM 19677.4%Apple 20247.1%NVIDIA 20247.1%Microsoft 20247.0%IBM 19856.4%Exxon Mobil 19806.2%Exxon Mobil 20075.2%Microsoft 19994.9%General Electric 19584.6%Apple 20184.4%Cisco Systems 20004.2%General Electric 20004.1%Amazon 20183.0%Eastman Kodak 19722.9%Alphabet 20142.4%Berkshire Hathaway 20081.7%Wal-Mart 19991.6%
Plate VIII.7 Comparing each company's peak market capitalization as a fraction of the total index (or total U.S. equity prior to 1957). Apple and Nvidia at ~7% each in 2024 remain below AT&T's 13% share in 1929, contextualizing contemporary concentration.

Comparing each company's peak market capitalization as a fraction of the total index (or total U.S. equity prior to 1957). Apple and Nvidia at ~7% each in 2024 remain below AT&T's 13% share in 1929, contextualizing contemporary concentration.

What this page answers

This static page is built to answer searches for TOP 10 · MARKET CAP ÷ INDEX. It summarizes the live dataset behind the Peak Weight in the Market: Historical Champions on a Common Benchmark panel and links to the full interactive chart.

Comparing each company's peak market capitalization as a fraction of the total index (or total U.S. equity prior to 1957). Apple and Nvidia at ~7% each in 2024 remain below AT&T's 13% share in 1929, contextualizing contemporary concentration. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.

View the interactive chart

Data & Source

Exchange closing prices · Company filings · Robert Shiller · FRED · NBER.

FAQ

Where does this data come from?

History of Market combines public market and macro datasets — exchange closing prices, company filings, Robert Shiller, FRED, NBER, and the UBS Global Investment Returns Yearbook (Dimson–Marsh–Staunton). The exact endpoint for this panel is linked below.

How often is it updated?

Daily-tier datasets refresh after the U.S. market close, with a broader weekly refresh on Sunday. The timestamp shown on this page comes from the JSON payload.

Can I use the data?

Yes, for research and education with attribution to History of Market. Upstream data sources retain their own terms.