Pre-Market and Post-Market Quotes Introduction

1. Pre&Post-market trading session

In addition to the regular trading sessions, US stocks also have extended pre-market and post-market trading sessions. Due to the 1-hour spread between daylight saving time and standard time in the United States, the trading sessions in the GMT+8 are adjusted by 1 hour correspondingly. Daylight saving time begins on the second Sunday in March each year, and standard time begins on the first Sunday in November.

Pre-marketIntraday (regular trading session)Post-market
EST4:00 - 9:309:30 - 16:0016:00 - 20:00
BJT/HKT/SGT (GMT+8) (EST: daylight saving time)16:00 - 21:3021:30 - 04:00(+1)04:00 - 08:00
BJT/HKT/SGT (GMT+8) (EST: standard time)17:00 - 22:3022:30 - 05:00(+1)05:00 - 09:00

2. Pre&Post-market price mechanism

The US stock exchanges do not have a unified official price for the pre-market and post-market prices. However, brokerage firms adopt the last done price to update the pre&post-market High/Low/Last sale according to the rules.

While the exchanges do not provide official prices for extended trading sessions, official guidelines are available. We offer pre&post-market prices to US stocks based on the guidelines from official Nasdaq and NYSE documents.

One of the most important rules is: odd lot transactions DO NOT UPDATE High/Low/Last Sale.

The following is a screenshot from the exchange:

Therefore, it is possible that “the last done price is inconsistent with the pre-market and post-market prices, which is normal.

In addition, different brokers may apply this rule differently, resulting in different pre-market and post-market prices displayed on different platforms. We can check the specific transaction details page to determine the price of the last "non-odd lot transaction".

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