M7 · Share of S&P 500 Market Cap — Seven companies, a third of US equities
Index share — Seven companies' share of the S&P 500, approaching a third.
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
The Magnificent 7 (AAPL, MSFT, NVDA, GOOGL, AMZN, META, TSLA) have grown from 13.0% of S&P 500 market cap in 2018 to 31.8% as of 2026-08-14 (live sum of index weights) — the highest top-seven concentration since the 1970s Nifty Fifty.
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.
The plate
Latest Snapshot
- Updated
- 2026-08-14
- Observations
- 14
- Sample
- 2018-12-31 – 2026-08-14
Magnificent 7 share of S&P 500 market cap (quarterly)
| Date | Weight |
|---|---|
| 2026-08-14 | 31.8% |
| 2026-03-31 | 32.8% |
| 2025-12-31 | 33.5% |
| 2025-06-30 | 32.5% |
| 2024-12-31 | 33.0% |
| 2024-06-30 | 31.0% |
| 2023-12-31 | 28.5% |
| 2023-06-30 | 27.0% |
| 2022-12-31 | 19.5% |
| 2022-09-30 | 18.5% |
| 2021-12-31 | 24.0% |
| 2020-12-31 | 22.5% |
| 2019-12-31 | 16.0% |
| 2018-12-31 | 13.0% |
Showing the full record (14 rows). Raw series: https://historyofmarket.com/api/mag7/concentration.json
Data & Source
GET /api/mag7/concentration.json — Canonical dataset endpoint.
Exchange closing prices · Company filings · Robert Shiller · FRED · NBER.
FAQ
How much of the S&P 500 do the Magnificent 7 make up today?
31.8% as of 2026-08-14 — up from 13.0% in 2018.
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.