GICS · 2018-09-24 Reshuffle — September 2018: a fifth of XLK swapped out in one day
2018 reshuffle — The GICS change that moved a fifth of XLK overnight.
S&P and MSCI moved GOOGL, META, NFLX and others out of Information Technology into the newly formed Communication Services sector. XLK's long curve crosses this date, but the internal composition shifted meaningfully — read the chart with this seam in mind.
What this page answers
This static page is built to answer searches for GICS · 2018-09-24 Reshuffle. It summarizes the live dataset behind the September 2018: a fifth of XLK swapped out in one day panel and links to the full interactive chart.
S&P and MSCI moved GOOGL, META, NFLX and others out of Information Technology into the newly formed Communication Services sector. XLK's long curve crosses this date, but the internal composition shifted meaningfully — read the chart with this seam in mind. 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
Data & Source
GET /api/xlk/reclass-2018.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.