SOX / SPX · SOX / XLK · XLK / SPX — Relative Strength: Semiconductors vs. S&P 500 and Tech
SOX relative to the S&P: 338.5 as of 2026-09-28.
Semiconductor Relative Strength — Ratio charts of SOX relative to the S&P 500 and XLK: assessing the semiconductor sector as a global macroeconomic leading indicator.
The plate
Ratio curves indexed to year-end 1999 = 100: SOX vs. S&P 500, SOX vs. XLK, and XLK vs. S&P 500. Delineates distinct historical regimes of semiconductor leadership and consolidation.
What this page answers
This static page is built to answer searches for SOX / SPX · SOX / XLK · XLK / SPX. It summarizes the live dataset behind the Relative Strength: Semiconductors vs. S&P 500 and Tech panel and links to the full interactive chart.
Ratio curves indexed to year-end 1999 = 100: SOX vs. S&P 500, SOX vs. XLK, and XLK vs. S&P 500. Delineates distinct historical regimes of semiconductor leadership and consolidation. 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
GET /api/semi/ratios.json — Canonical dataset endpoint.
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.