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  2. Pulse-repetition frequency - Wikipedia

    en.wikipedia.org/wiki/Pulse-repetition_frequency

    The pulse-repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit. The term is used within a number of technical disciplines, notably radar . In radar, a radio signal of a particular carrier frequency is turned on and off; the term "frequency" refers to the carrier, while the PRF refers to the number of ...

  3. High-frequency trading - Wikipedia

    en.wikipedia.org/wiki/High-frequency_trading

    In the United States in 2009, high-frequency trading firms represented 2% of the approximately 20,000 firms operating today, but accounted for 73% of all equity orders volume. [citation needed] [28] The major U.S. high-frequency trading firms include Virtu Financial, Tower Research Capital, IMC, Tradebot, Akuna Capital and Citadel LLC. [29]

  4. Algorithmic trading - Wikipedia

    en.wikipedia.org/wiki/Algorithmic_trading

    In the U.S., high-frequency trading (HFT) firms represent 2% of the approximately 20,000 firms operating today, but account for 73% of all equity trading volume. [73] As of the first quarter in 2009, total assets under management for hedge funds with HFT strategies were US$141 billion, down about 21% from their high. [ 74 ]

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  6. Extended-hours trading - Wikipedia

    en.wikipedia.org/wiki/Extended-hours_trading

    Since 1985, the regular trading hours for major exchanges in the United States, such as the New York Stock Exchange and the Nasdaq stock market, have been from 9:30 a.m. to 4:00 p.m. Eastern Time (ET). [3] Pre-market trading occurs from 4:00 a.m. to 9:30 a.m. ET, although the majority of the volume and liquidity come to the pre-market at 8:00 a ...

  7. Trading day - Wikipedia

    en.wikipedia.org/wiki/Trading_day

    In business, the trading day or regular trading hours (RTH) is the time span that a stock exchange is open, as opposed to electronic or extended trading hours (ETH). For example, the New York Stock Exchange is, as of 2020, open from 9:30 AM Eastern Time to 4:00 PM Eastern Time. Trading days are usually Monday through Friday.