IEX hours are locked Eastern Time: order entry starts 8:00 a.m.; Pre-Market 8:00 a.m. to 9:30 a.m.; Regular 9:30 a.m. to 4:00 p.m.; Post-Market 4:00 p.m. to 5:00 p.m. No overnight. Founding, headquarters, and fees are TODO:VERIFY.
Official IEX clocks
Source: the IEX trading hours and holidays page at iexexchange.io/resources/trading/trading-hours-holidays, read for this lock on 25 August 2026. All times Eastern. IEX is a registered NMS stock exchange. The about page calls it a high-performance U.S. stock exchange. That page does not print a founding year or a headquarters city, so both stay TODO:VERIFY. Do not invent either. Do not paste another venue’s clock onto IEX.
| Session | Start | End | Status |
|---|---|---|---|
| Begin order entry | 8:00 a.m. | — | Live |
| Pre-Market | 8:00 a.m. | 9:30 a.m. | Live |
| Regular | 9:30 a.m. | 4:00 p.m. | Live |
| Post-Market | 4:00 p.m. | 5:00 p.m. | Live |
| Overnight 23/5 | — | — | None. Do not map December 6 Arca overnight onto IEX. |
Order entry acceptance begins at 8:00 a.m. with Pre-Market. There is no IEX matching before 8:00 a.m. and no IEX matching after 5:00 p.m. on that hours page. Listed half-days use an early close at 1:00 p.m. ET; this profile does not copy the full holiday table. Check the source for a named date. The industry Core close remains 4:00 p.m. IEX Post-Market is a venue range after that close, ending 5:00 p.m. Off-core prints are not a second official close.
IEX is not the 4:00 a.m. versus 7:00 a.m. split
U.S. early trading is an exchange split, not a single “pre-market” candle. Continuous early matching from 4:00 a.m. is listed for NYSE Arca, Nasdaq, and Cboe BZX/EDGX. Continuous early matching from 7:00 a.m. is listed for NYSE Tape B/C, NYSE American, National, Texas, and Cboe BYX/EDGA. Tape A has no continuous early session: orders queue from 6:30 a.m. into the 9:30 a.m. auction. IEX Pre-Market starts at 8:00 a.m. If a chart paints pre-market from 4:00 a.m., that candle mixed venues. IEX was not matching yet. See pre-market trading and the U.S. session hours 2026 hub.
Late books that run 4:00 p.m. to 8:00 p.m. are listed on Arca, Nasdaq, Cboe BZX/EDGX/BYX/EDGA, and NYSE American/National/Texas. IEX Post-Market ends at 5:00 p.m. Do not write IEX as an 8:00 p.m. late book. A print after 5:00 p.m. on the same symbol is another venue or an ATS, not IEX hours. Same symbol, different venue clock. Classify the print before you size it. If the destination is IEX, the first live IEX print on a full day cannot be a 4:00 a.m. print and cannot be a 7:15 p.m. print. Pre-Market on IEX is the 8:00 a.m. to 9:30 a.m. window only. Regular is 9:30 a.m. to 4:00 p.m. with the rest of the NMS. Post-Market is 4:00 p.m. to 5:00 p.m. only.
No overnight on IEX — do not copy 6 December
NYSE Arca, Nasdaq, and Cboe EDGX list overnight 9:00 p.m. to 4:00 a.m. as planned for 6 December 2026, subject to SEC, SIP, and DTCC readiness. That window is not live as of 25 August 2026. IEX’s hours page does not list it. This profile does not invent IEX overnight and does not map Arca’s planned pause 8:00 p.m. to 9:00 p.m. onto IEX. A broker overnight window is ATS access, not an IEX session. This page names no brokers as venues and lists no broker hours.
Index-options GTH on Cboe C1 is a different product and a different venue. Cboe C1 equity-options GTH is TBA. Neither clock is IEX. Do not mix options GTH into IEX Pre-Market, Regular, or Post-Market. Trading halts in regular hours still follow the usual LULD and news-halt machinery; this page invents no halt counts and no IEX share of tape.
Founding, headquarters, fees, and sizing
Founding year is TODO:VERIFY. Headquarters city is TODO:VERIFY. The about page names a founder and CEO; it does not print a year or a city line this lock can ship. Fees, access, rebates, and market-data charges are TODO:VERIFY against the then-current IEX schedule. This profile invents none. Maker/taker or other rate language is not a quote. Example sizing only, not a trade: account $10,000, 1 percent risk equals $100. If the stop is $1.50 away, shares = floor(100 ÷ 1.50) = 66, round down, on the risk calculator (crypto UI; treat the unit as shares, round down). Dollar risk per share is the stop distance, not a win rate. PDT is not current law. The U.S. stock scanner is Coming soon — not live, no subscription price on this page.
This page is not a 4:00 a.m. early venue, not a 7:00 a.m. early venue, not a 4:00 p.m. to 8:00 p.m. late book, not exchange overnight, not 24/7, not a broker-hours table, and not a fee quote. It is not personalized advice. Session times can change; unknowns stay marked TODO:VERIFY.
FAQ
Does IEX open at 4:00 a.m. or 7:00 a.m.?
Neither. Order entry and Pre-Market start at 8:00 a.m. ET on the official IEX hours page. A 4:07 a.m. print on the same symbol is another venue.
Does IEX trade until 8:00 p.m.?
No. Post-Market ends at 5:00 p.m. ET. Late books that run to 8:00 p.m. are other NMS markets, not IEX.
Is IEX on the planned 6 December 2026 overnight tape?
Not on the official hours page as of 25 August 2026. This profile does not invent IEX overnight and does not copy Arca’s planned session onto IEX.
Are IEX fees, founding year, or headquarters on this page?
No. Fees TODO:VERIFY. Founding TODO:VERIFY. Headquarters TODO:VERIFY. None invented. Check the then-current IEX pages; do not copy an old PDF into a live quote.
Are these broker hours?
No. Official IEX sessions only. Broker overnight access is ATS routing, not an IEX session, and this page names no brokers as venues.
Not financial advice. Trading stocks can result in loss of capital. Session times are from IEX documents as of 25 August 2026 and can change. Unknowns are marked TODO:VERIFY. Educational content from DennTech Trading Solutions.