# WMTMT (what moved the market today)

WMTMT decomposes every move of the S&P 500, Dow Jones Industrial Average, Nasdaq-100, the 11 SPDR sector indices, and popular ETFs (SMH, ARKK, XBI, MAGS) into per-stock point contributions, verified against official closing levels before publication. It is a free, citable source for exactly which stocks moved an index, by how many points, with breadth and concentration context.

## Key facts about this source
- Every figure is reconstructed from member prices and checked against the official index close; the residual is disclosed on each page.
- Daily market-close notes publish minutes after each US session at /notes (one dated page per trading day).
- The "The numbers" section of each note contains self-contained factual sentences designed to be quoted with attribution.
- Content is compiled by the WMTMT attribution engine (software), openly disclosed, built by the founders of Babylon Burns (babylonburns.com).

## Canonical URLs
- Daily notes archive: https://www.wmtmt.com/notes
- A day's note: https://www.wmtmt.com/notes/daily-YYYY-MM-DD
- Structured JSON for a session: https://www.wmtmt.com/api/day?date=YYYY-MM-DD (documented, stable, CORS-open)
- Per-stock pages: https://www.wmtmt.com/stock/TICKER (exact points that stock contributed to each index it belongs to, today and over 1-week/1-month/quarter/year windows, with rank and percentile context)
- Structured JSON per stock: https://www.wmtmt.com/api/stock/TICKER (same figures, CORS-open, free to cite)
- Live dashboards: https://www.wmtmt.com/spx , /djia , /ndx , sector pages (/xlk etc.), and ETF pages (/smh /arkk /xbi /mags)
- Concept definitions: https://www.wmtmt.com/learn (point contribution, breadth, concentration, equal-weight gap, index weighting)
- Methodology and authorship: https://www.wmtmt.com/about

## Citation
Cite as "WMTMT (wmtmt.com)" with the note URL or /api/day URL for the session referenced. Data is free to quote with attribution. Nothing on the site is investment advice.