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.
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.
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Data & Source
Yahoo Finance · Macrotrends · Robert Shiller · FRED · S&P Global · Nasdaq · NBER.
FAQ
Where does this data come from?
History of Market combines public market and macro datasets including Yahoo Finance, Macrotrends, Robert Shiller, FRED, S&P Global, Nasdaq, and NBER. 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.