Corporate Co-Tenure: How Long Market Leaders Shared the Top 10
Top 10 Cohabitation Matrix — Matrix tracking decades of simultaneous cohabitation among market cap leaders across a century of corporate history.
The plate
Pairing historical market leaders to measure how many decades they simultaneously occupied the Top 10 by market cap. GE and AT&T co-existed across seven decades, while IBM and Exxon shared five decades, reflecting multi-generational dominance.
What this page answers
This static page is built to answer searches for TOP 10 · CO-OCCURRENCE + PAIRS. It summarizes the live dataset behind the Corporate Co-Tenure: How Long Market Leaders Shared the Top 10 panel and links to the full interactive chart.
Pairing historical market leaders to measure how many decades they simultaneously occupied the Top 10 by market cap. GE and AT&T co-existed across seven decades, while IBM and Exxon shared five decades, reflecting multi-generational dominance. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.
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.