Introduction#

The US stock market does not trade around the clock. The NYSE and NASDAQ are open for regular trading from 9:30 AM to 4:00 PM Eastern Time, Monday through Friday. Outside that window, extended-hours sessions allow trading with significant limitations.

Knowing stock market hours — including pre-market, after-hours, holidays, and global session overlaps — helps you understand when liquidity is highest, when spreads are tightest, and when price moves are most reliable.

US Regular Trading Hours#

Both the New York Stock Exchange (NYSE) and NASDAQ follow the same schedule:

  • Regular session: 9:30 AM – 4:00 PM Eastern Time (ET)
  • Days: Monday through Friday
  • Closed: Weekends and designated market holidays

All times are Eastern Time, which shifts between EST (UTC-5) in winter and EDT (UTC-4) in summer when daylight saving takes effect.

Pre-Market and After-Hours Trading#

Extended-hours trading is available before and after the regular session:

  • Pre-market: 4:00 AM – 9:30 AM ET
  • After-hours: 4:00 PM – 8:00 PM ET

Not all brokers offer the full window. Typical availability by broker:

  • Interactive Brokers: 4:00 AM – 9:30 AM pre-market, 4:00 PM – 8:00 PM after-hours (widest standard window)
  • Charles Schwab: 7:00 AM – 9:25 AM pre-market, 4:05 PM – 8:00 PM after-hours. thinkorswim offers 24/5 trading on 1,100+ equities
  • Fidelity: 7:00 AM – 9:28 AM pre-market, 4:00 PM – 8:00 PM after-hours
  • Robinhood: 24 Hour Market available on 900+ stocks from 8:00 PM ET Sunday through 8:00 PM ET Friday

Risks of extended-hours trading:

  1. Lower liquidity — fewer participants means some stocks may not trade at all
  2. Wider spreads — the bid-ask gap increases, raising your cost per trade
  3. Higher volatility — large price swings on low volume
  4. Limit orders only — most brokers require limit orders during extended hours (no market orders)
  5. Price may not carry over — the extended-hours price can diverge significantly from the next regular session open

FINRA and the SEC both publish specific risk warnings about extended-hours trading. Use limit orders exclusively outside regular hours.

Market Holidays 2026#

US stock exchanges are closed on 10 holidays in 2026:

  • January 1 — New Year's Day (Thursday)
  • January 19 — Martin Luther King Jr. Day (Monday)
  • February 16 — Presidents' Day (Monday)
  • April 3 — Good Friday (Friday)
  • May 25 — Memorial Day (Monday)
  • June 19 — Juneteenth (Friday)
  • July 3 — Independence Day observed (Friday; July 4 falls on Saturday)
  • September 7 — Labor Day (Monday)
  • November 26 — Thanksgiving Day (Thursday)
  • December 25 — Christmas Day (Friday)

Early close days (market closes at 1:00 PM ET):

  • November 27 — Day after Thanksgiving (Black Friday)
  • December 24 — Christmas Eve

On early close days, options trading continues until 1:15 PM ET.

Global Market Hours#

If you trade international stocks or want to understand how global markets affect US opening prices, here are the major exchanges:

  • Tokyo (TSE/JPX): 9:00 AM – 3:30 PM JST (UTC+9), lunch break 11:30 AM – 12:30 PM. The TSE extended its close from 3:00 PM to 3:30 PM in November 2024 — the first change in 70 years
  • Shanghai (SSE): 9:30 AM – 3:00 PM CST (UTC+8), lunch break 11:30 AM – 1:00 PM
  • Hong Kong (HKEX): 9:30 AM – 4:00 PM HKT (UTC+8), lunch break 12:00 PM – 1:00 PM
  • Sydney (ASX): 10:00 AM – 4:00 PM AEST (UTC+10/11)
  • Frankfurt (XETRA): 9:00 AM – 5:30 PM CET (UTC+1/2). Extended retail hours from 8:00 AM to 10:00 PM since December 2025
  • London (LSE): 8:00 AM – 4:30 PM GMT/BST (UTC+0/1)
  • Toronto (TSX): 9:30 AM – 4:00 PM ET — same hours as NYSE

Why Session Overlaps Matter#

The most important period of the trading day for both stocks and forex is when major sessions overlap — more participants means more volume, tighter spreads, and more efficient price discovery.

London–New York overlap (approximately 1:00 PM – 4:30 PM UTC in winter): This is the highest-liquidity window in global markets. Over 50% of daily forex volume occurs during this overlap. For US stocks, the period from the US market open through early afternoon often sees the most significant price moves.

Tokyo–London overlap (approximately 7:00 AM – 8:00 AM UTC): A brief window where Asian and European sessions share activity. Relevant for JPY and GBP crosses.

New York–Sydney overlap (approximately 9:00 PM – 10:00 PM UTC): The thinnest overlap with the lowest liquidity.

The Opening and Closing Auctions#

The first and last minutes of the trading day are not ordinary trading — they are structured auctions that set official prices.

NYSE opening auction: The Designated Market Maker (DMM) assigned to each stock aggregates overnight buy and sell orders and determines an opening price that maximizes matched volume. The DMM uses both electronic systems and manual judgment, factoring in news, order imbalances, and supply/demand. Pre-open imbalance data is published before 9:30 AM.

NASDAQ opening cross: Fully automated with no human market maker. Between 9:25 AM and 9:30 AM, NASDAQ publishes the Net Order Imbalance Indicator (NOII), showing reference price, paired shares, and imbalance direction. At 9:30 AM, the system matches all eligible orders at a single price.

The closing auction works similarly and sets the official closing price used for index calculations, mutual fund NAVs, and settlement.

Circuit Breakers#

If the market drops sharply, trading can be halted automatically. Market-wide circuit breakers are based on the S&P 500's percentage decline from the prior close:

  • Level 1 (7% decline) — 15-minute trading halt. Only triggers before 3:25 PM ET
  • Level 2 (13% decline) — 15-minute halt. Only triggers before 3:25 PM ET
  • Level 3 (20% decline) — trading halted for the remainder of the day. Can trigger at any time

Thresholds are recalculated daily. Level 1 and Level 2 can each trigger only once per day. These rules were originally introduced after the 1987 Black Monday crash and updated by the SEC in 2013. Most recently, the Level 1 circuit breaker triggered in April 2025 during tariff-related market volatility.

Individual stocks also have their own circuit breakers through the Limit Up-Limit Down (LULD) mechanism, which pauses trading if a stock moves beyond specified price bands.

Daylight Saving Time and International Alignment#

The US and Europe change clocks on different dates, creating a roughly three-week gap each spring and autumn when the time difference shifts.

In 2026, US clocks spring forward on March 8, while Europe follows on March 29. During those three weeks, the US–UK time difference narrows from 5 hours to 4 hours, shifting the London–New York overlap and changing when international traders see US market activity.

Asian markets (Japan, China, Hong Kong) do not observe daylight saving time. Their hours relative to the US shift twice per year. If you trade across time zones, mark these dates on your calendar.

Settlement: T+1#

Since May 28, 2024, US stock trades settle one business day after the trade date (T+1). If you sell shares on Monday, the cash settles on Tuesday. Previously, settlement was T+2 (since 2017) and T+3 before that.

T+1 reduces counterparty risk and frees up capital faster, but it also means less time to resolve funding issues. For most retail traders, the change is seamless — your broker handles settlement automatically.

Key Takeaways#

  • US stock markets (NYSE and NASDAQ) trade 9:30 AM – 4:00 PM ET, Monday through Friday
  • Pre-market runs 4:00 AM – 9:30 AM ET; after-hours runs 4:00 PM – 8:00 PM ET — but liquidity is thin and spreads are wide
  • There are 10 market holidays in 2026 and 2 early close days (1:00 PM ET)
  • The London–New York overlap is the highest-liquidity period — over 50% of daily forex volume occurs in this window
  • Circuit breakers halt trading at 7%, 13%, and 20% S&P 500 declines — last triggered in April 2025
  • US settlement is now T+1 (one business day) as of May 28, 2024
  • Daylight saving time shifts international market alignment for ~3 weeks each spring and autumn — plan accordingly