History of Market · The Chronicle of the U.S. Stock Market Top 10 Dynasties
Gathering VII · leaf 7 of 8
TOP 10 · MARKET CAP ÷ INDEX

TOP 10 · MARKET CAP ÷ INDEX — Peak share of the index · a row of anchors

Peak index weight — Each era's champion at peak share of the index, side by side.

Each firm's peak market cap rendered as a fraction of the S&P 500 (or, before 1957, of all listed U.S. equity). Read down: Apple 2024 at 7% and Nvidia 2024 at 7% still haven't caught AT&T's 13% in 1929 — the line 'today's giants are unprecedented' usually falls apart on this scale.

View the interactive chart

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 share of the index · a row of anchors panel and links to the full interactive chart.

Each firm's peak market cap rendered as a fraction of the S&P 500 (or, before 1957, of all listed U.S. equity). Read down: Apple 2024 at 7% and Nvidia 2024 at 7% still haven't caught AT&T's 13% in 1929 — the line 'today's giants are unprecedented' usually falls apart on this scale. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.

The plate

TOP 10 · MARKET CAP ÷ INDEX — Peak share of the index · a row of anchorsAT&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 VII.7 Each firm's peak market cap rendered as a fraction of the S&P 500 (or, before 1957, of all listed U.S. equity). Read down: Apple 2024 at 7% and Nvidia 2024 at 7% still haven't caught AT&T's 13% in 1929 — the line 'today's giants are unprecedented' usually falls apart on this scale.

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.