M7 · Share of S&P 500 Market Cap — Seven companies, a third of US equities
From 13% in 2018 to over 33% at year-end 2024 — these seven stocks hold a third of the S&P 500's market cap. Since the 1970s Nifty Fifty, no comparable single group has held this much weight. Each quarterly point carries its own note.
What this page answers
This static page is built to answer searches for M7 · Share of S&P 500 Market Cap. It summarizes the live dataset behind the Seven companies, a third of US equities panel and links to the full interactive chart.
From 13% in 2018 to over 33% at year-end 2024 — these seven stocks hold a third of the S&P 500's market cap. Since the 1970s Nifty Fifty, no comparable single group has held this much weight. Each quarterly point carries its own note. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.
Latest Snapshot
- Updated
- 2026-05-11
- Observations
- 13
- Sample
- 2018-12-31 – 2026-03-31
Static Preview
Data & Source
GET /api/mag7/concentration.json — Canonical dataset endpoint.
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.