Source: https://mochatrade.com/learn/glossary/iex

# IEX
URL: https://mochatrade.com/learn/glossary/iex
Last modified: 2026-10-17

IEX is the US stock exchange that delays every order by 350 microseconds through a coil of fibre, so it can update its own prices before anyone trades against a stale one. The slow exchange by design, and a clean example of [why one stock trades on twenty venues](https://mochatrade.com/learn/us-market-structure/how-us-stock-prices-form).

## Related terms

- Trading halt: https://mochatrade.com/learn/glossary/trading-halt
- NBBO: https://mochatrade.com/learn/glossary/nbbo
- Closing auction (official close): https://mochatrade.com/learn/glossary/closing-auction
- CME Group: https://mochatrade.com/learn/glossary/cme-group
- Order book: https://mochatrade.com/learn/glossary/order-book
- REIT (US): https://mochatrade.com/learn/glossary/reit