Stock extended hours trading

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Extended hours trading includes both pre-market and after hours sessions each day the market is open.

How can my stock's price change after hours, and what effect does this have on investors? Can I sell the stock at the after-hours price?

Extended hours trading allows investors to act quickly to news and events that occur when the regular market is closed. What is the Nasdaq Pre-Market Indicator SM? A question asked every day by investors and the financial news media is "Will the market open up or down today?

After-Hours Trading (AHT)

The PMI was developed by nasdaq. What is the Nasdaq After Hours Indicator SM? The Nasdaq After Hours Indicator is also an index of trading activity. The AHI is based on extended hours trading prices during the after hours market, 4: How would the Nasdaq Indicators be used? Historically, limited information sources have been available to gauge market sentiment during extended hours trading, leading into or after regular market hours trading.

Resources have been pretty much limited to observation of trading activity in individual stocks or futures contracts. Now, with the PMI and AHI, it's possible to get a big pre-market or after hours market picture based on actual trading data. How representative of the market as a whole are the Nasdaq Indicators? The Nasdaq Index has, since its inception, been one of the most frequently used gauges of the marketplace and is widely considered to be a good barometer of the market as a whole.

With the same calculation as the Nasdaq Index but using pre-market or after hours prices, the Nasdaq Indicators offer a helpful measure - indicating extended hours trading trends. How are the Nasdaq Pre-Market and After Hours Indicators calculated? The Indicators are minute by minute calculations during extended hours trading, using the same calculation used for the Nasdaq Index during regular market hours.

The Pre-Market Indicator is calculated based on last sale prices of Nasdaq securities during pre-market trading , 4: If a Nasdaq security does not trade during the pre-market, the calculation uses last sale from the previous day 4 p. The After Hours Indicator is calculated based on last sale prices of Nasdaq securities during after hours trading , 4: And if a Nasdaq security does not trade in the after hours market, the calculation uses last sale price from that day's 4 p.

How was the quality of the Nasdaq Pre-Market and After Hours Indicators evaluated? Nasdaq Economic Research performed an analysis of the methodology for calculating the Indicators' values and determined that the methodology is consistent with calculation of the Nasdaq Index during regular market hours and has shown good continuity with prices at open and close of regular market hours.

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