# WhichIndex

> Every stock index, and every company in it: members, weights and the reverse lookup (which indexes a company is in), each dated and sourced.

## How the data works

- [Methodology](https://whichindex.com/methodology/): sources per index, refresh cadence, known gaps
- Every table states its source and as-of date. Weights from ETF holdings are labelled as ETF weights.
- [About](https://whichindex.com/about/): what WhichIndex is, sources, disclaimer

## Indexes

- [S&P 500](https://whichindex.com/indexes/sp-500/): 501 companies, as of 2026-10-23
- [Nasdaq-100](https://whichindex.com/indexes/nasdaq-100/): 100 companies, as of 2026-10-26
- [Dow Jones](https://whichindex.com/indexes/dow-jones/): 30 companies, as of 2026-10-23
- [Euro Stoxx 50](https://whichindex.com/indexes/euro-stoxx-50/): 50 companies, as of 2026-10-26
- [DAX](https://whichindex.com/indexes/dax/): 40 companies, as of 2026-10-26
- [CAC 40](https://whichindex.com/indexes/cac-40/): 40 companies, as of 2026-10-26
- [IBEX 35](https://whichindex.com/indexes/ibex-35/): 35 companies, as of 2026-10-22
- [IBEX Medium Cap](https://whichindex.com/indexes/ibex-medium/): 20 companies, as of 2026-10-26
- [IBEX Small Cap](https://whichindex.com/indexes/ibex-small/): 30 companies, as of 2026-10-26
- [AEX](https://whichindex.com/indexes/aex/): 29 companies, as of 2026-10-23
- [FTSE 100](https://whichindex.com/indexes/ftse-100/): 100 companies, as of 2026-10-26
- [Russell 2000](https://whichindex.com/indexes/russell-2000/): 1959 companies, as of 2026-10-23
- [Nasdaq Composite](https://whichindex.com/indexes/nasdaq-composite/): 3377 companies, as of 2026-10-23
- [NYSE Composite](https://whichindex.com/indexes/nyse-composite/): 1859 companies, as of 2026-10-26
- [S&P/TSX Composite](https://whichindex.com/indexes/sp-tsx-composite/): 216 companies, as of 2026-10-23
- [S&P/BMV IPC](https://whichindex.com/indexes/sp-bmv-ipc/): 35 companies, as of 2026-10-23
- [Ibovespa](https://whichindex.com/indexes/ibovespa/): 74 companies, as of 2026-10-26
- [S&P IPSA](https://whichindex.com/indexes/sp-ipsa/): 30 companies, as of 2026-06-30
- [S&P Merval](https://whichindex.com/indexes/merval/): 23 companies, as of 2026-10-26 (unverified: a wikipedia table)
- [FTSE MIB](https://whichindex.com/indexes/ftse-mib/): 40 companies, as of 2026-10-26
- [SMI](https://whichindex.com/indexes/smi/): 20 companies, as of 2026-10-26
- [ATX](https://whichindex.com/indexes/atx/): 20 companies, as of 2026-10-26
- [BEL 20](https://whichindex.com/indexes/bel-20/): 20 companies, as of 2026-10-22
- [AMX](https://whichindex.com/indexes/amx/): 25 companies, as of 2026-09-30
- [AMS Next 20](https://whichindex.com/indexes/ams-next-20/): 20 companies, as of 2026-09-30
- [PSI](https://whichindex.com/indexes/psi/): 14 companies, as of 2026-09-30
- [ISEQ 20](https://whichindex.com/indexes/iseq-20/): 20 companies, as of 2026-10-26 (unverified: a wikipedia table)
- [LuxX](https://whichindex.com/indexes/luxx/): 9 companies, as of 2026-10-26
- [OMX Stockholm 30](https://whichindex.com/indexes/omx-stockholm-30/): 30 companies, as of 2026-10-23
- [OMX Copenhagen 20](https://whichindex.com/indexes/omx-copenhagen-20/): 19 companies, as of 2026-10-23
- [OMX Helsinki 25](https://whichindex.com/indexes/omx-helsinki-25/): 25 companies, as of 2026-10-23
- [OMX Iceland 15](https://whichindex.com/indexes/omx-iceland-15/): 15 companies, as of 2026-10-23
- [OSEBX](https://whichindex.com/indexes/osebx/): 61 companies, as of 2026-08-26
- [OMX Tallinn](https://whichindex.com/indexes/omx-tallinn/): 18 companies, as of 2026-10-23
- [OMX Riga](https://whichindex.com/indexes/omx-riga/): 8 companies, as of 2026-10-23
- [OMX Vilnius](https://whichindex.com/indexes/omx-vilnius/): 19 companies, as of 2026-10-23
- [WIG20](https://whichindex.com/indexes/wig20/): 20 companies, as of 2026-10-23
- [MOEX Russia](https://whichindex.com/indexes/moex/): 41 companies, as of 2026-10-23
- [BIST 100](https://whichindex.com/indexes/bist-100/): 100 companies, as of 2026-09-30
- [Nikkei 225](https://whichindex.com/indexes/nikkei-225/): 225 companies, as of 2026-10-26
- [Shanghai Composite](https://whichindex.com/indexes/sse-composite/): 2321 companies, as of 2026-10-26
- [Hang Seng](https://whichindex.com/indexes/hang-seng/): 95 companies, as of 2026-10-02
- [Nifty 50](https://whichindex.com/indexes/nifty-50/): 50 companies, as of 2026-10-26
- [KOSPI](https://whichindex.com/indexes/kospi/): 825 companies, as of 2026-10-26
- [Straits Times Index](https://whichindex.com/indexes/straits-times/): 30 companies, as of 2026-10-23
- [IDX Composite](https://whichindex.com/indexes/idx-composite/): 980 companies, as of 2026-10-26
- [KSE 100](https://whichindex.com/indexes/kse-100/): 100 companies, as of 2026-10-26
- [VN-Index](https://whichindex.com/indexes/vn-index/): 406 companies, as of 2026-10-26
- [S&P/ASX 200](https://whichindex.com/indexes/sp-asx-200/): 200 companies, as of 2026-10-23
- [S&P/NZX 50](https://whichindex.com/indexes/sp-nzx-50/): 49 companies, as of 2026-09-30 (unverified: rebuilt from index funds' holdings)
- [TA-35](https://whichindex.com/indexes/ta-35/): 36 companies, as of 2026-10-23
- [TASI](https://whichindex.com/indexes/tasi/): 252 companies, as of 2026-10-26
- [QE Index](https://whichindex.com/indexes/qe-index/): 20 companies, as of 2026-09-01
- [ADX General](https://whichindex.com/indexes/adx-general/): 79 companies, as of 2026-10-26
- [ASE General](https://whichindex.com/indexes/ase-general/): 68 companies, as of 2026-09-30
- [EGX 30](https://whichindex.com/indexes/egx-30/): 30 companies, as of 2026-10-26 (unverified: a wikipedia table)
- [JSE Top 40](https://whichindex.com/indexes/jse-top-40/): 40 companies, as of 2026-10-26

## Optional

- [Countries](https://whichindex.com/countries/)
- [Largest companies by market cap](https://whichindex.com/rankings/largest-companies-by-market-cap/)
- [Rankings](https://whichindex.com/rankings/): by region, country, sector and number of indexes