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US stocks

Index membership

QuantGPT

Who joined and left the S&P 500, 400 and 600, the Dow 30 and the Nasdaq-100, and QuantGPT's own size ranks.

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What it is

Who joined and left the S&P 500, 400 and 600, the Dow 30 and the Nasdaq-100, and QuantGPT's own size ranks.

  • index constituents history: Index adds and drops: S&P 500, 400, 600, Dow 30 (public records), Nasdaq-100 (vendor plus a rule), R1000, R2000, R3000 (QuantGPT's market-cap ranking).

Source and licence

Source: public records (S&P, Dow), EODHD (Nasdaq-100 today), QuantGPT (market-cap ranks).

Licence: membership facts; index names are trademarks. This is our reading of the table; counsel decides.

Coverage and gap years

5,051 names, 17,906 rows in index constituents history, from Mar 12, 1987 to Oct 9, 2026.

Years with no rows: 1988 to 1990, 1992 to 1994.

Thin years: 1991.

TableRowsFirstLast
index constituents history17,906Mar 12, 1987Oct 9, 2026

Freshness

Last row Oct 9, 2026: Up to date on the day measured. Updates: when an index changes.

Point in time

Keyed on the day a name was added and the day it was dropped, so a backtest uses the index as it stood.

No version history in the table: it holds the latest copy the engine loaded.

Delisted names

Included: past members stay, with the day they were dropped.

Known issues

  • index constituents history. No adds were recorded from 1988 to 1990 or from 1992 to 1994. SP500 shows 509 current members and NDX100 200 (ACCURACY.md section 7). (WAREHOUSE, Gaps and freshness that matter)

Where it is used

Engine tools that reach it (your AI, over MCP):

  • run_backtest Backtest any criteria in seconds: up to 8 filters over the factor vocabulary, ranked by a numeric factor, top N equal weight (or weighting: market cap, inverse vol, factor, custom, with max weight),...
  • query_warehouse Run read-only SQL (DuckDB dialect) directly against any research database.

Ask AI

Every count and date here was measured on Oct 9, 2026 from the QuantGPT engine's warehouse and is read from the catalogue file when the site is built. Metadata only: no vendor rows are shown.