New York Stock Exchange

The New York Stock Exchange (NYSE), also known as the 'Big Board', is one of the primary equity markets in the United States. Founded in 1817, it has long been an icon of capitalism. Over the years, NYSE has merged with other exchanges globally and is now a flagship exchange in the NYSEEuronext group.
Currency: US Dollar (USD)

Basic Market Rules:

• Lot Size: 100 shares.
• Tick Size: varies by price and security.
• Short Sale Rules: naked short sales are prohibited, a locate must be obtained prior to executing a short sell.
• Circuit Breakers: imposed under conditions defined

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NASDAQ

The NASDAQ OMX Group owns and operates 26 markets, making them the largest exchange company in the world
Currency: US Dollar (USD)

Basic Market Rules:

• Lot Size: 100 shares.
• Tick Size: varies by price and security.
• Short Sale Rules: naked short sales are prohibited, a locate must be obtained prior to executing a short sell.
• Circuit Breakers: imposed under conditions defined

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NYSE Arca

NYSE Arca, previously known as ArcaEx, is a securities exchange on which both stocks and options are traded. On February 27, 2006, ArcaEx merged with NYSE Group in a reverse merger and the business was renamed NYSE Arca. The fully electronic NYSE Arca trades more than 8,000 exchange-listed equity securities, including on NASDAQ.
Currency: US Dollar (USD)

Trading Summary

As of 2007, NYSE Arca is the second-largest electronic communication network in terms of shares traded. Approximately one out of every six shares traded on the American financial markets is traded on the system. For New York Stock Exchange–listed securities or Tape A, it accounts for just over 10% of the shares traded. For NASDAQ-listed securities, NYSE Arca accounts for approximately 20% of the trading volume. For exchange-traded funds, NYSE Arca accounts for 30–40% of the traded volume

Basic Market Rules:

• Lot Size: 100 shares. See NYSE Arca Rule 7.5.
• Tick Size: less than $1.00, 0.0001; $1.00 or greater, 0.01. See NYSE Arca Rule 7.6.
• Circuit Breakers: between 6:45 am and 12:35 pm Pacific Time, or in the case of an early close, 25 minutes before the closing of trading, if the price of a security moved by a percentage specified below within a five-minute period, trading in that security shall immediately pause on the exchange for a period of 5 minutes.
• A) 10% or more with respect to securities included in the S&P 500 Index, Russell 1000 Index, and the Invesco Power Shares QQQ exchange traded fund;
• B) 30% or more with respect to all Tier 2 NMS Stocks with a price equal to or greater than 4; and
• C) 50% or more with respect to all Tier 2 NMS Stocks with a price less than $1. The determination that the price of a stock is equal to or greater than $1 in b) or less than $1 in c) shall be based on the closing price on the previous trading day, or, if no closing price exists, the last sale reported to the Consolidated Tape on the previous trading day. See NYSE Arca Rule 7.11.